JP2012249344A - Coaxial cassette type rotary electric machine stator - Google Patents

Abstract

To reduce the size of a concentric cassette type rotating electrical machine stator.
A stator 10 includes a stator core 14 and a plurality of cassette annular portions 18, 20, 22 wound around the stator core 14. The cassette annular portions 18, 20, and 22 of each phase include a plurality of conductor cassette coils 16 that are wound around the stator core 14 and connected to each other in an annular shape. In the cassette annular portions 18, 20, and 22 of each phase, the radial direction leading portions 70 and 90 provided in the plurality of conductor cassette coils 16 are connected by the plurality of in-phase bus bars 24u, 24v, and 24w provided in the outer peripheral portion. . The three-phase cassette annular portions 18, 20, and 22 are connected by a plurality of neutral point bus bars provided on the outer peripheral portion. In the circumferential bus bar arrangement portion 38 in which the plurality of bus bars 24u, 24v, 24w are arranged, the in-phase bus bars 24u, 24v, 24w and the neutral point bus bar are formed in a staircase shape.
[Selection] Figure 19

Description

  The present invention comprises a concentric cassette type rotation comprising a stator core having slots provided at a plurality of locations in the circumferential direction, and a multi-phase cassette annular portion that is axially mounted on the stator core and arranged concentrically with each other. The present invention relates to an electric stator.

  Conventionally, as a stator of a rotating electrical machine used as a motor or a generator, a stator core provided with a plurality of radially extending grooves called slots is provided in the circumferential direction, and inserted into two slots that are separated from each other in the circumferential direction. In addition, a structure in which a stator coil is wound around a stator core by distributed winding is known.

  Further, Patent Document 1 includes two sets of U-phase, V-phase, and W-phase windings, and a stator core, and each phase winding is wound around the stator core by distributed winding, and a plurality of phases There is described a stator for a motor in which two coil arrays in which windings are electrically connected in series are formed, and each of the two phase coil arrays is connected in a double star type. Thus, it is supposed that the applied voltage at the time of driving a motor can be made low by making the connection of each phase coil into a double star connection.

JP 2005-12974 A

  Further, as one type of stator, the stator core can be mounted in the axial direction, each of which includes a plurality of stator coils, and includes a plurality of cassette annular portions formed in a substantially annular shape and arranged concentrically with each other. A core cassette type rotating electrical machine stator is conceivable. However, in this concentric cassette type rotating electrical machine stator, when providing a connection portion by welding or the like between the stator coil and the bus bar on the outer peripheral portion, the radial dimension at the arrangement portion of the bus bar (simply referred to as “radial direction” (This is the same in the entire specification and claims), and there is room for improvement in terms of downsizing the stator including the bus bar. In other words, in this configuration, a circumferential bus bar arrangement portion is provided that extends in the circumferential direction and is arranged on the radially inner side of the connection portion between the stator coil and the bus bar on the outer circumferential portion of the stator. However, if the bus bars in the circumferential bus bar arrangement portion are simply formed in an arc shape, the radial rows of the bus bars in the circumferential bus bar arrangement portion may become large. Further, in terms of the thermal protection of the insulating coating on the bus bar, it is necessary to increase the distance between the connection portion of the stator coil and the bus bar and the circumferential bus bar arrangement portion. For this reason, the distance from the stator center of the connection part of a stator coil and a bus bar becomes large, and a stator may enlarge.

  Further, the number of rows in the axial direction of the bus bars (simply referred to as “axial direction” means the axial direction of the stator. The same applies to the entire specification and claims) in the circumferential bus bar arrangement portion. However, it is conceivable to reduce the number of rows in the radial direction of the bus bars. In this case, however, the axial dimension of the stator including the bus bars increases, and the stator may also be increased in size.

  Further, when connecting a plurality of cassette annular portions with two Y connections, that is, double star connection, etc., when connecting with a plurality of Y connections, the circumferential direction (when simply referred to as “circumferential direction” refers to the circumferential direction of the stator. (This is the same in the entire specification and claims.) The number of bus bars provided at the same position increases, and the stator may be further increased in size. For this reason, it is desired to reduce the number of rows of the bus bars in the radial direction without increasing the number of rows in the axial direction of the bus bars in the circumferential direction bus bar arrangement portion in which a plurality of bus bars are arranged extending in the circumferential direction.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a concentric cassette-type rotating electrical machine stator without increasing the number of axial rows of bus bars in many or all of the circumferential direction bus bar arrangement portions where a plurality of bus bars are arranged extending in the circumferential direction. To reduce the size of the bus bars by reducing the number of rows in the radial direction.

  A concentric cassette type rotating electrical machine stator according to the present invention includes a stator core having slots provided at a plurality of locations in the circumferential direction, and a multi-phase cassette ring that is axially mounted on the stator core and arranged concentrically with each other. Each phase of the cassette annular portion includes a plurality of stator coils wound around the stator core and connected to each other in a ring shape, and each phase of the cassette annular portion includes a plurality of stator coil radial outer ends. The radial direction lead-out portions provided so as to extend in the radial direction are connected by a plurality of in-phase bus bars provided in the outer peripheral portion, and the plurality of cassette annular portions are provided in a plurality of neutrality provided in the outer peripheral portion. In the circumferential direction bus bar arrangement portion where a plurality of in-phase bus bars and neutral point bus bars are arranged extending in the circumferential direction at the outer peripheral portion, the in-phase bus bar and the middle At least a portion of the bus bar of the point busbar is concentric cassette type rotating electrical machine stator, characterized in that it is formed in a stepped shape.

  According to the concentric cassette type rotating electrical machine stator according to the present invention, in the circumferential bus bar arrangement portion in which a plurality of bus bars are arranged extending in the circumferential direction, at least a part of the in-phase bus bar and the neutral point bus bar has a stepped shape. As a result, it is possible to increase the degree of freedom of arrangement of a plurality of bus bars at many locations in the circumferential direction, and to increase the number of rows of bus bars in the axial direction at many or all of the circumferential bus bar arrangement portions. The number of bus bars in the radial direction can be reduced, for example, within two rows. For this reason, size reduction of a stator can be achieved.

  Further, in the concentric cassette type rotating electrical machine stator according to the present invention, preferably, the bus bar formed in a staircase shape includes a first portion and a second portion which are shifted in a height direction or a radial direction which is an axial direction of the stator. And a step portion connecting the first portion and the second portion.

  In the concentric cassette type rotating electrical machine stator according to the present invention, preferably, the plurality of cassette annular portions are connected by a plurality of Y connections.

  According to the above configuration, the number of bus bars provided at the same position in the circumferential direction in the circumferential bus bar arrangement portion tends to increase, but in many or all of the circumferential bus bar arrangement portions, Since the number of rows in the radial direction of the bus bar can be reduced, for example, within two rows without increasing the number of rows, the effect of reducing the size of the stator becomes remarkable. Moreover, it can easily cope with a large current.

  In the concentric cassette type rotating electrical machine stator according to the present invention, preferably, each phase of the cassette annular portion includes a plurality of conductor cassette coils which are stator coils arranged at a plurality of locations in the circumferential direction. Has a radial direction derivation portion provided at both ends, and a plurality of slot insertion portions connected to the respective radial direction derivation portions and inserted into slots separated from each other. The radial lead-out portion of the conductor cassette coil is connected to the radial lead-out portion provided at the end of another conductor cassette coil by an in-phase bus bar.

  In the concentric cassette type rotating electrical machine stator according to the present invention, preferably, each conductor cassette coil has a one-side radial lead-out portion provided on one circumferential side and is inserted into two slots separated in the circumferential direction. The first element is wound around a part of the circumferential direction of the stator core a plurality of times, and the other side radial direction lead-out portion provided on the other circumferential side is inserted into two slots separated in the circumferential direction. And a second element wound around a part of the circumferential direction of the stator core a plurality of times, the opposite end to the one-side radial direction deriving portion of the first element, and the other-side radial direction deriving portion of the second element The slot insertion portion of the first element and the slot insertion portion of the second element are inserted into slots shifted in the circumferential direction.

  Further, in the concentric cassette type rotating electric machine stator according to the present invention, preferably, the plurality of cassette annular portions are Y-connected at the first neutral point and the second neutral point, respectively. In the section, among the plurality of conductor cassette coils arranged in the circumferential direction, every other plurality of conductor cassette coils in the circumferential direction are connected in series to form a first group connected to the first neutral point, A plurality of conductor cassette coils adjacent to the first group in the circumferential direction are connected in series to form a second group connected to the second neutral point. In the first group, the radial direction of the conductor cassette coils adjacent in the circumferential direction The lead-out portions are connected by a plurality of in-phase bus bars, and a plurality of conductor cassette coils are arranged in one circumferential direction from the input end side toward the first neutral point side. Conductors adjacent to each other Radial outlet portions of the set coil is connected by a plurality of in-phase bus bars, from the input end side to the second neutral point side are arranged side by side a plurality of conductors cassette coil in the circumferential direction other direction.

  According to the above configuration, the multi-phase cassette annular portion is more effectively used in many or all of the circumferential bus bar arrangement portions in spite of being connected by two Y connections. Without increasing the number of rows, the number of rows in the radial direction of the bus bars can be reduced, for example, within two rows, so that the stator can be more effectively downsized.

  According to the concentric cassette type rotating electrical machine stator according to the present invention, without increasing the number of rows in the axial direction of the bus bars in many or all of the circumferential bus bar arrangement portions where a plurality of bus bars extending in the circumferential direction are arranged, The bus bar can be reduced in size by reducing the number of rows in the radial direction.

It is a schematic perspective view which shows the concentric cassette type rotary electric machine stator of embodiment of this invention. It is the figure which looked at the specific structure of the stator of FIG. 1 in the axial direction. FIG. 3 is a diagram showing a connection state of cassette annular portions for a U phase in the stator of FIG. 2. It is the figure which looked at 1 conductor cassette coil which comprises the stator of FIG. 2 to radial direction. It is a perspective view of the conductor cassette coil of FIG. It is the figure which looked at the 1st element which comprises the conductor cassette coil of FIG. 4 to radial direction. It is a perspective view which shows the 1st element of FIG. It is the figure which looked at the 2nd element which comprises the conductor cassette coil of FIG. 4 to radial direction. It is a perspective view which shows the 2nd element of FIG. FIG. 6 is an enlarged view of the end portion of the conductor cassette coil as viewed from the radially outer side to the radially inner side in part A of FIG. 5. In the rotary electric machine including the concentric cassette type rotary electric machine stator of the embodiment of the present invention, it is a schematic diagram showing a connection configuration of a plurality of conductor cassette coils for the U phase. FIG. 3 is a diagram showing a U-phase cassette annular portion taken out from the stator of FIG. 2, with a bus bar and some elements omitted. In the rotating electrical machine of FIG. 11, when the rotor is moved to the upper left of FIG. 11, a circuit of a plurality of conductor cassette coils for a single phase for explaining voltage changes in the conductor cassette coils of the first group and the second group FIG. It is a figure corresponding to FIG. 11 which shows the rotary electric machine in the case of connecting the multi-phase conductor cassette coil by the single star connection. It is a figure corresponding to FIG. 11 which shows another example of the rotary electric machine in the case of connecting the multi-phase conductor cassette coil by double star connection. 15 is a circuit diagram of a plurality of stator coils for a single phase for explaining voltage changes in the stator coils of the first group and the second group when the rotor is moved to the upper left of FIG. 15 in the rotating electric machine of FIG. is there. It is the perspective view seen from the arrow B direction of FIG. 12 which shows a bus bar couple | bonded and shown by the cassette annular part of the U phase of FIG. It is the perspective view seen from the arrow C direction of FIG. 12 which couple | bonds and shows a bus bar in the cassette annular part of the U phase of FIG. FIG. 3 is a view of a part of the circumferential direction opposite to the portion D in FIG. 2 from the radially outer side in the stator of FIG. 2. It is EE sectional drawing of FIG. FIG. 3 is a perspective view of a part of the circumferential direction including a portion D of FIG. 2 as viewed from the outside in the radial direction in the stator of FIG. 2. It is the perspective view seen from the upper part of FIG. It is a schematic diagram which shows the bus-bar arrangement | positioning structure in the bus-bar arrangement | positioning part of FIG. 21, and the connection part of the radial direction derivation | leading-out part of each phase, and a neutral point bus bar. FIG. 3 is a perspective view of a part of the circumferential direction including an F portion in FIG. 2 as viewed from the radially outer side in the stator of FIG. 2. It is the perspective view seen from the upper part of FIG. It is a schematic diagram which shows the bus-bar arrangement | positioning structure in the bus-bar arrangement | positioning part of FIG. 24, the radial direction derivation | leading-out part of each phase, and the connection part of a neutral point bus bar. It is a figure corresponding to FIG. 11 which shows another example of the rotary electric machine in the case of connecting the multi-phase conductor cassette coil by double star connection. In the rotating electrical machine of FIG. 27, when the rotor is shifted to the upper left of FIG. 27, a circuit of a plurality of conductor cassette coils for a single phase for explaining voltage changes in the conductor cassette coils of the first group and the second group FIG. It is a figure corresponding to FIG. 2 which shows the stator of another example of embodiment of this invention. In the stator of FIG. 29, a part of the circumferential direction including the G portion of FIG. 29 is viewed from the outside in the radial direction. In the stator of FIG. 29, a part in the circumferential direction including the portion H of FIG.

  Hereinafter, an embodiment according to the present invention will be described with reference to FIGS. As shown in FIGS. 1 to 3, the concentric cassette type rotating electrical machine stator (hereinafter simply referred to as “stator”) of the present embodiment is used to configure a rotating electrical machine such as an electric motor or a generator. The FIG. 1 is a schematic perspective view showing a stator according to the present embodiment. FIG. 2 is a view of the specific structure of the stator of FIG. 1 as viewed in the axial direction. FIG. 3 is a diagram showing a connection state of cassette annular portions for the U phase in the stator of FIG.

  The stator 10 includes a stator core 14 made of an annular magnetic material having slots 12 provided at a plurality of locations in the circumferential direction, and a conductor cassette coil 16 that is a plurality of stator coils wound around the stator core 14 in a distributed winding manner. A plurality of U-phase, V-phase, and W-phase three-phase cassette annular portions 18, 20, and 22 are provided. A plurality of conductor cassette coils (hereinafter simply referred to as “cassette coils”) 16 are connected in a substantially annular manner, that is, connected to the cassette annular portions 18, 20, 22 of each phase.

  The three-phase cassette annular portions 18, 20, and 22 are attached to the stator core 14 in the axial direction, and are arranged concentrically with each other. When the stator 10 is used, a rotor (not shown) fixed to the rotating shaft is arranged on the radially inner side of the stator 10, and the stator 10 and the rotor are opposed to each other in the radial direction to constitute a radial rotating electric machine. To do.

  First, the cassette coil 16 which comprises the cassette annular parts 18, 20, and 22 (FIG. 1) of each phase is demonstrated using FIGS. 4 is a view of one cassette coil constituting the stator of FIG. 2 as viewed in the radial direction. FIG. 5 is a perspective view showing the cassette coil of FIG. Each cassette coil 16 is configured by forming a coil element wire made of a rectangular conductor wire having a rectangular cross section covered with an insulating coating in a coil shape. Each cassette coil 16 has a one-side slot insertion portion 60 and a one-side intermediate slot insertion portion 62 which are a plurality of slot insertion portions respectively inserted into a plurality of slots 12 (FIG. 3) separated in the circumferential direction of the stator core 14 (FIG. 2). , The other-side intermediate slot insertion portion 64, and the other-side slot insertion portion 66. Each cassette coil 16 includes a one-side coil end portion 68 provided at one axial end portion (lower end portion in FIG. 5) of each slot insertion portion 60, 62, 64, 66, a one-side radial direction lead-out portion 70, and the like. Side radial direction deriving portion 90. The one-side radial direction lead-out portion 70 is provided at one end of the cassette coil 16 led out from one slot 12 and extends radially outward (left side in FIGS. 4 and 5) and then radially outward (see FIGS. 4 and 5). 5) and straddles another phase of the cassette coil on the axially outer side of the stator core 14 (FIG. 2). The other-side radial direction lead-out portion 90 is provided at the other end portion led out from another one slot 12 of the cassette coil 16 and extends radially outward after extending to the other side in the circumferential direction (right side in FIGS. 4 and 5). (The upper side in FIGS. 4 and 5) and straddles another phase of the cassette coil outside the stator core 14 in the axial direction.

  Each cassette coil 16 is configured by joining the first element 72 shown in FIGS. 6 and 7 and the second element 74 shown in FIGS. 8 and 9 by welding such as TIG welding. First, the first element 72 will be described. FIG. 6 is a diagram of the first element as viewed in the radial direction. FIG. 7 is a perspective view showing the first element of FIG. The first element 72 is connected to the one-side radial direction derivation unit 70 provided on one side in the circumferential direction (the right side in FIGS. 6 and 7), and is connected to the one-side radial direction derivation unit 70 directly or via another part. And a plurality of one-side slot insertion portions 60 inserted in alignment with the one-side slot 12. The one-side radial direction lead-out portion 70 is connected to the one-side slot insertion portion 60 at the radially outermost end of the circumferential one-side portion of the first element 72, and is led out to the axially outer side of the stator core 14. 6. It extends to the outside in the radial direction (upper side in FIG. 6) after extending to the left side in FIG.

  Further, the first element 72 has an other-side intermediate radial direction deriving portion 78 provided on the other side in the circumferential direction (the left side in FIGS. 6 and 7), and a direct portion or other portion on the other-side intermediate radial direction deriving portion 78. And a plurality of other intermediate slot insertion portions 64 that are inserted in alignment with the slots 12 on the other circumferential side. The other-side intermediate radial direction lead-out portion 78 is connected to the other-side intermediate slot insertion portion 64 at the radially outermost end of the other circumferential portion of the first element 72 and is led out to the outer side in the axial direction of the stator core 14. It extends in one direction (right side in FIGS. 6 and 7) and then radially outward (upper side in FIG. 6). Further, the plurality of other intermediate slot insertion portions 64 are separated from the plurality of one-side slot insertion portions 60 to the other side in the circumferential direction by the unit coil interval D1.

  Further, the first element 72 has a plurality of first connection elements 80 that form a one-side coil end portion 68 (FIGS. 4 and 5) and connect the one-side slot insertion portion 60 and the other-side intermediate slot insertion portion 64, respectively. . Each first connection element 80 has slot passage portions 82 and 84 provided at both ends, and an inner connection portion 86. The slot passing portions 82 and 84 extend in a direction that coincides with the radial direction of the two slots 12 in which the one-side slot insertion portion 60 and the other-side intermediate slot insertion portion 64 are disposed. The inner connecting portion 86 connects both the slot passing portions 82 and 84. The first element 72 coils the one-side radial direction derivation section 70, the plurality of one-side slot insertion sections 60, the plurality of first connection elements 80, the plurality of other side intermediate slot insertion sections 64, and the other side intermediate radial direction derivation section 78. It is formed to be connected in a shape.

  The slot passage portions 82 and 84 are described later in the axial direction from one axial side of the stator core 14 (FIG. 2) while inserting the slot insertion portions 60 and 64 into the corresponding plurality of slots 12 (FIG. 3). When assembling the cassette annular portions 18, 20, and 22 (FIG. 1), the cassette annular portions 18, 20, and 22 (FIG. 1) pass through the corresponding two slots 12 in the axial direction, and then are led out from the slots 12. The inner connecting portion 86 is disposed on the inner side in the radial direction than the inner peripheral surface of the stator core 14 in a state where the cassette annular portions 18, 20, and 22 are disposed on the stator core 14. Such a first element 72 is wound a plurality of times (for a plurality of turns) around a part of the stator core 14 in the circumferential direction so as to be inserted into two slots 12 separated in the circumferential direction.

  Next, the second element 74 will be described. FIG. 8 is a diagram of the second element as viewed in the radial direction. FIG. 9 is a perspective view showing the second element of FIG. The second element 74 is connected to the one-side intermediate radial direction derivation portion 88 provided on one side in the circumferential direction (the right side in FIGS. 8 and 9) and the one-side intermediate radial direction derivation portion 88 directly or via another portion. And a plurality of one-side intermediate slot insertion portions 62 that are inserted in alignment with the slots 12 on one side in the circumferential direction. The one-side intermediate radial direction lead-out portion 88 is connected to the one-side intermediate slot insertion portion 62 at the radially outermost end of the one-side portion in the circumferential direction of the second element 74, and is led out to the axially outer side of the stator core 14. It extends to the outside in the radial direction (upper side of FIG. 8) after extending to the left (FIG. 8, left side of FIG. 9).

  In addition, the second element 74 includes the other-side radial direction derivation unit 90 provided on the other side in the circumferential direction (the left side in FIGS. 8 and 9), and the other-side radial direction derivation unit 90 directly or via another part. A plurality of other slot insertion portions 66 are connected and inserted in alignment with the slots 12 on the other circumferential side. The other-side radial direction lead-out portion 90 is connected to the other-side slot insertion portion 66 in the radially outermost end of the other circumferential portion of the second element 74, and is led out to the axially outer side of the stator core 14. (Upper side in FIG. 8). Further, the plurality of other-side slot insertion portions 66 are separated from the plurality of one-side intermediate slot insertion portions 62 to the other side in the circumferential direction by the unit coil interval D1.

  Further, the second element 74 forms a one-side coil end portion 68 (FIGS. 4 and 5), and includes a plurality of second connection elements 122 that connect the one-side intermediate slot insertion portion 62 and the other-side slot insertion portion 66, respectively. . Each second connection element 122 includes second slot passage portions 124 and 126 provided at both ends, and a second inner connection portion 128. The second slot passage portions 124 and 126 extend in a direction that coincides with the radial direction of the two slots 12 in which the one-side intermediate slot insertion portion 62 and the other-side slot insertion portion 66 are disposed. The second inner connecting portion 128 connects both the second slot passage portions 124 and 126. The second element 74 coils the one-side intermediate radial direction derivation portion 88, the plurality of one-side intermediate slot insertion portions 62, the plurality of second connection elements 122, the plurality of other side slot insertion portions 66, and the other side radial direction extraction portion 90. It is formed to be connected in a shape.

  Further, each of the second slot passage portions 124 and 126 inserts the slot insertion portions 62 and 66 into the corresponding plurality of slots 12, and cassette annular portions 18 and 20 described later in the axial direction from one axial direction of the stator core 14. , 22 are passed through the corresponding two slots 12 in the axial direction and then led out from the slots 12. The second inner connecting portion 128 is disposed on the inner side in the radial direction than the inner peripheral surface of the stator core 14 in a state where the cassette annular portions 18, 20, and 22 are disposed on the stator core 14. Such a second element 74 is wound around a part in the circumferential direction of the stator core 14 a plurality of times (for a plurality of turns) so as to be inserted into two slots 12 separated in the circumferential direction.

  FIG. 10 is an enlarged view of the end portion of the cassette coil 16 viewed from the radially outer side to the radially inner side in the portion A of FIG. As shown in FIG. 10, welding such as TIG welding or the like in a state where the distal ends of the one-side intermediate radial direction derivation portion 88 of the second element 74 and the other-side intermediate radial direction derivation portion 78 of the first element 72 are overlapped. By joining together, the first element 72 and the second element 74 are combined to form an integral cassette coil 16. That is, the opposite end to the one-side radial direction deriving portion 70 of the first element 72 and the opposite end to the other-side radial direction deriving portion 90 (FIGS. 8 and 9) of the second element 74 are connected. . 4 and FIG. 5, the one-side slot insertion portion 60 and the other-side intermediate slot insertion portion 64 of the first element 72, and the one-side intermediate slot insertion portion 62 and the other-side slot insertion portion 66 of the second element 74. And inserted in the slot 12 (FIG. 3) shifted in the circumferential direction. Moreover, the axial direction (vertical direction of FIG. 5) position of the one side radial direction derivation | leading-out part 70 of the 1st element 72 and the other side radial direction derivation | leading-out part 90 of the 2nd element 74 has shifted | deviated. As shown in FIG. 19 and FIG. 24, which will be described later, the one-side radial lead-out portion 70 is arranged far away from the axial end surface of the stator core 14 in a state where the cassette coils 16 are arranged at a plurality of locations in the circumferential direction of the stator core 14. The other-side radial direction deriving portion 90 is disposed at a position near the axial end surface of the stator core 14.

  The plurality of cassette coils 16 thus formed form a three-phase cassette annular portion 18, 20, 22 (FIG. 1) by being connected in an annular shape in each phase. That is, returning to FIGS. 1 and 2, the stator 10 of the present embodiment is called a “concentric cassette type”, and the cassette annular portions 18, 20, 22 of each phase are provided at a plurality of locations in the circumferential direction of the stator core 14. Includes a plurality of cassette coils 16 disposed in the space. In addition, the three-phase cassette annular portions 18, 20, and 22 are configured such that a first group in which a plurality of cassette coils 16 of each phase are connected in series is Y-connected, and a plurality of cassette coils 16 of each phase are connected in series. And a configuration in which the second group is Y-connected. This will be described using the cassette annular portion 18 for the U phase as a representative with reference to FIG.

  FIG. 11 is a schematic diagram showing a connection configuration of a plurality of cassette coils for the U phase in the rotating electrical machine including the stator of the present embodiment. In the U-phase cassette annular portion 18, among the plurality of cassette coils 16 arranged at a plurality of locations in the circumferential direction of the stator core 14, every other plurality of cassette coils 16 in the circumferential direction are connected in series, respectively. A second group 96 is formed.

  In FIG. 11, A1, A2,... Represent elements constituting the cassette coil 16 of the first group 94. B1, B2,... Represent elements constituting the cassette coil 16 of the second group 96. A1, A3, A5, and A7, and B2, B4, B6, and B8 indicate the first element 72 (FIGS. 6 and 7). A2, A4, A6, A8 and B1, B3, B5, B7 indicate the second element 74 (FIGS. 8 and 9). A1 and A2, A3 and A4, A5 and A6, A7 and A8 indicate the four cassette coils 16 of the first group 94, respectively. B1 and B2, B3 and B4, B5 and B6, and B7 and B8 indicate the four cassette coils 16 of the second group 96, respectively. Hereinafter, the symbols A1, A2,... A8, B1, B2,. That is, elements A1 to A8 at the beginning of winding of the cassette coil 16 are connected in series in the order of A2, A3,. The first group 94 is formed by connecting the winding end element A8 to the first neutral point N1.

  Further, the winding start element B1 of the cassette coil 16 from the input end IN is electrically connected in series in the order of B2, B3,... B8, and the winding end element B8 is connected to the second neutral point N2. Thus, the second group 96 is formed. Therefore, in the U-phase cassette annular portion 18, among the plurality of cassette coils 16 arranged at a plurality of locations in the circumferential direction of the stator core 14, every other plurality of cassette coils 16 in the circumferential direction are connected in series, respectively. A first group 94 connected to the sex point N1 is formed. In addition, a plurality of cassette coils 16 adjacent to the first group 94 in the circumferential direction are connected in series to form a second group 96 connected to the second neutral point N2. The first group 94 and the second group 96 are respectively connected between the input end IN and the first neutral point N1 on the power line side and between the input end IN and the second neutral point N2. Although the U-phase cassette annular portion 18 has been described above, the same applies to the V-phase cassette annular portion 20 (FIG. 1) and the W-phase cassette annular portion 22 (FIG. 1). Therefore, the three-phase cassette annular portions 18, 20, and 22 are Y-connected at the first neutral point N1 and the second neutral point N2, which are two neutral points.

  In order to configure in this way, the plurality of cassette coils 16 are configured such that a part of the first element 72 and the second element 74 are axially arranged as shown by the U-phase cassette annular portion 18 in FIG. Combined in an annular shape so as to overlap. Further, in each phase, by connecting a plurality of cassette coils 16 with a plurality of in-phase bus bars 24u, 24v, 24w (FIGS. 17 to 19) described later, the cassette annular portions 18, 20, and 22 (FIGS. 17 to 19) are connected. Forming. Specifically, as will be described below with reference to the U-phase cassette ring portion 18 in FIGS. 17 and 18 to be described later, one side provided to extend in the radial direction at the radially outer end portion of each cassette coil 16. The radial lead-out portion 70 and the other-side radial lead-out portion 90 provided so as to extend in the radial direction at the radial outer end of another cassette coil 16 are constituted by a plurality of in-phase bus bars 24u provided at the outer peripheral portion. It is connected.

  Returning to FIG. 11, as representatively shown by the U-phase cassette annular portion 18, in the first group 94, the one-side radial lead-out portion 70 of the cassette coil 16 adjacent in the circumferential direction (FIGS. 17 and 18). ) And the other-side radial direction derivation section 90 (FIGS. 17 and 18) are connected by the in-phase bus bar 24u, and the plurality of cassette coils 16 are arranged in the circumferential direction from the input end IN side toward the first neutral point N1 side. They are arranged side by side in the direction (counterclockwise in FIG. 11). Similarly, in the second group 96, the one-side radial direction derivation portion 70 and the other-side radial direction derivation portion 90 of the cassette coils 16 that are adjacent in the circumferential direction are connected by the in-phase bus bar 24u, and the second middle 96 is connected from the input end IN side. A plurality of cassette coils 16 are arranged side by side in the other circumferential direction (clockwise in FIG. 11) toward the sex point N2.

  Although the U-phase cassette annular portion 18 has been described above, the V-phase and W-phase cassette annular portions 20 and 22 (FIG. 1) are similarly configured. The three-phase cassette annular portions 18, 20, and 22 have a plurality of neutral point bus bars 30 (FIG. 2) provided on the outer peripheral portion corresponding to the first neutral point N1 and the second neutral point N2, respectively. ). Note that the first neutral point N1 and the second neutral point N2 may be the same, that is, a single neutral point.

  In the connection diagram of FIG. 3, FIG. 11 is shown more specifically. FIG. 3 is a diagram illustrating a connection state of the cassette annular portion 18 for the U phase. The meanings of the symbols A1, A2,... A8, B1, B2,... B8 in FIG. In FIG. 3, the numbered portion on the inner peripheral side of the stator core 14 indicates the slot number. Further, “IN” indicates that it is connected to the input end on the power line side, and “N1, N2” indicates the first neutral point and the second neutral point, respectively. Further, C1A, C2A..., C1B, C2B... Indicate the coil numbers of the cassette coils 16 of the first group 94 and the second group 96, respectively. Hereinafter, the cassette coil 16 may be described with a coil number. In the cassette annular portion 18, the cassette coil C2A is connected to the winding start cassette coil C1A on the input end IN side in the first group 94, and thereafter, similarly, C3A and C4A are sequentially connected, and the winding end cassette coil C4A. Is connected to the first neutral point N1. In addition, the cassette coil C2B is connected to the winding start cassette coil C1B on the input end IN side in the second group 96, and thereafter, similarly, C3B and C4B are sequentially connected, and the winding end cassette coil C4B is in the second middle. It is connected to the sex point N2. Although the case of the U-phase cassette annular portion 18 has been described above, the case of the V-phase and the W-phase is similarly configured. Such a configuration in which every other cassette coil 16 in the circumferential direction in each phase is connected in series is called “separate winding”.

  In each cassette coil 16 of the U-phase cassette annular portion 18, the slot insertion portions 60 and 64 (FIG. 5) on both sides in the circumferential direction of the first elements A1, A3..., B2, B4. .., B1, B3... Are inserted into the slot 12 shifted one by one from the slot insertion portions 62 and 66 (FIG. 5) on both sides in the circumferential direction. Further, the four slot insertion portions of each cassette coil 16 of the V-phase cassette annular portion 20 (FIG. 1) are arranged around the slot 12 into which the slot insertion portions 60, 64, 62, 66 of the U-phase cassette annular portion 18 are inserted. It is inserted into the slot 12 shifted by one or two in one direction.

  Further, the four slot insertion portions of each cassette coil 16 of the W-phase cassette annular portion 22 (FIG. 1) are arranged around the slot 12 into which the slot insertion portions 60, 64, 62, 66 of the U-phase cassette annular portion 18 are inserted. It is inserted into the slot 12 which is further shifted by one or two in one direction.

  In such a configuration, even when the inner rotor 32 is eccentric with respect to the stator 10 in the rotating electric machine shown in FIG. 11, the generation of circulating current can be prevented, and the generation of eighth-order noise that is harmonic noise can be prevented. FIG. 13 shows a plurality of single-phase components for explaining voltage changes in the cassette coil 16 of the first group 94 and the second group 96 when the rotor is moved to the upper left of FIG. FIG. 6 is a circuit diagram of the cassette coil 16 of FIG. The meanings of the symbols A1, A2... A8, B1, B2,... B8 in FIG. For example, as shown in FIG. 11, when the rotor 32 with the permanent magnet 34 is opposed to the inside of the stator 10, the central axis O of the rotor 32 is in the upper left of FIG. 11 (in the direction of arrow α in FIG. 11). The case where it deviates from the stator 10 is considered. In this case, as shown in FIG. 13, since the rotor 32 (FIG. 11) approaches at the elements A1 and A2 of the first group 94, the voltage (induced voltage) rises, and conversely the rotor 32 leaves at the elements A5 and A6. As a result, the voltage decreases. On the other hand, since the rotor 32 is separated by the elements B3 and B4 of the second group 96, the voltage decreases, and conversely, the voltage increases by the elements B7 and B8. For this reason, since the total voltage in the first group 94 and the second group 96 is the same, a large voltage difference does not occur between the first group 94 and the second group 96, and the first group 94. And a circulating current that circulates between the second group 96 and the second group 96 does not occur. For this reason, the performance improvement of a rotary electric machine can be aimed at. Further, in the configuration shown in FIG. 11, since the multi-phase cassette coil 16 is of a double star connection type in which two Y connections are connected, it can be easily handled even when a large current flows.

  On the other hand, as shown in FIG. 14, in the same configuration as in the present embodiment, cassette coils 16 adjacent in the circumferential direction in each phase are connected in series, and a single Y at a single neutral point N is obtained. In the case of a single star connection type that is connected by connection, no circulating current is generated as in the present embodiment. However, unlike the present embodiment, it is difficult to cope with a large current unless special measures are taken, such as changing the winding cross section when a large current is applied.

  Further, as shown in FIG. 15, the first group 94 and the second group 96 are formed in which the cassette coils 16 adjacent in the circumferential direction in each phase are connected in series for about a half turn in the same configuration as the present embodiment. It is also possible to adopt a double star connection type in which two neutral points N1 and N2 are connected by two Y connections. However, in this configuration, when the central axis O of the rotor 32 is shifted to the upper left of FIG. 15 (in the direction of arrow α in FIG. 15) and is eccentric with respect to the stator 10, as shown in FIG. Since the rotor 32 (FIG. 15) approaches at the elements A1 to A4, the voltage rises. On the other hand, since the rotor 32 is separated by the elements B5 to B8 of the second group 96, the voltage decreases. For this reason, a large voltage difference is generated between the first group 94 and the second group 96, and the current circulates between the first group 94 and the second group 96 as shown by an arrow β in FIG. Circulating current may occur. On the other hand, according to the above-described embodiment, it is possible to eliminate all such inconveniences and effectively improve the performance.

  Further, in the present embodiment, at least some of the bus bars are formed in a substantially staircase shape in the plurality of bus bars arranged in the circumferential bus bar arrangement part provided in the outer peripheral part. That is, as shown in FIGS. 17 to 18, in the cassette annular portions 18, 20, and 22 of each phase, in the longitudinal direction intermediate portions of the respective in-phase bus bars 24 u, 24 v, and 24 w provided on the outer periphery, A connecting portion 36 that is an inclined step portion is provided. This will be described in detail with reference to FIGS. FIG. 17 is a perspective view seen in the direction of arrow B in FIG. 12, showing the bus bar 24u coupled to the U-phase cassette annular portion 18 in FIG. 18 is a perspective view seen in the direction of arrow C in FIG. 12, showing the bus bar 24u coupled to the U-phase cassette annular portion 18 in FIG. FIG. 19 is a view of a part of the circumferential direction on the opposite side of the portion D in FIG. 2 from the radially outer side in the stator 10 of FIG. 20 is a cross-sectional view taken along line EE in FIG.

  As shown in FIGS. 17 and 18, in the U-phase cassette annular portion 18, the other-side radial direction derivation portion 90 and the one-side radial direction derivation portion of the two cassette coils 16 that are spaced apart from each other in the circumferential direction at the outer peripheral portion. In-phase bus bar 24u is connected to 70. The plurality of in-phase bus bars 24u are provided to connect the cassette coils of the first group 94. The in-phase bus bars 24u on the radially inner side indicated by P in FIGS. 17 and 18 and the cassette coils of the second group 96 are connected. And a radially in-phase bus bar 24u indicated by Q in FIGS. As understood with reference to FIG. 11 above, the in-phase bus bar 24u of the first group 94 and the in-phase bus bar 24u of the second group 96 are at least partially in the circumferential direction of the U-phase cassette annular portion 18. Placed in position. For this reason, in the present embodiment, the intermediate portions excluding the connection portions with the cassette coil 16 that are both ends of the in-phase bus bars 24u of the first group 94 extend in the circumferential direction at the outer peripheral portions, and a plurality of in-phase bus bars 24u, 24v. , 24w (FIG. 19) are arranged in the circumferential direction in the inner row, which is the radially inner side of the circumferential bus bar arrangement portion 38.

  Moreover, the intermediate part except the connection part with the cassette coil 16 which is the both ends of the in-phase bus bar 24u of the 2nd group 96 is radial direction rather than the in-phase bus bar 24u of the 1st group 94 among the circumferential direction bus-bar arrangement | positioning parts 38. It arrange | positions in the circumferential direction in the outer row | line | column which is an outer side. Each in-phase bus bar 24u is bent at both ends so as to extend in the radial direction, and has connecting portions 40 and 42 that are overlapped and joined to both ends of the cassette coil 16. In addition, each in-phase bus bar 24u is provided at an intermediate portion, and a first portion 44 and a second portion 46, which are shifted from each other in the height direction (vertical direction in FIGS. 17 and 18) that is the axial direction of the stator, And a connecting portion 36 that is a stepped portion connecting the portion 44 and the second portion 46. Each of the first portion 44 and the second portion 46 extends in the circumferential direction within the circumferential bus bar arrangement portion 38, and the connecting portion 36 is inclined with respect to the circumferential direction. Further, as shown in FIG. 19, the in-phase bus bars 24 v and 24 w of the V-phase cassette annular portion 20 and the W-phase cassette annular portion 22 are formed in the same manner as the in-phase bus bar 24 u of the U-phase cassette annular portion 18.

  19 and 20, the in-phase bus bars 24u, 24v, 24w of the respective phases do not interfere with each other in the inner row 48 and the outer row 50 of the circumferential bus bar arrangement portion 38, that is, incline It arrange | positions so that the in-phase bus-bar 24u, 24v, 24w of another phase may be avoided by the part 36 (FIG. 19). For example, in FIG. 19, in the in-phase bus bar 24 u of the U-phase second group 96, the second portion 46 far from the stator core 14 is the upper side of the outer row 50 (“upper side” means the side far from the stator core 14 in the axial direction. 19 refers to the upper side of Fig. 19. Conversely, the "lower side" refers to the side closer to the stator core 14 in the axial direction, and refers to the lower side of Fig. 19. The same applies hereinafter. Further, in the U-phase second group 96 in-phase bus bar 24 u, the first portion 44 close to the stator core 14 is disposed below the outer row 50. The same applies to the V phase and the W phase.

  Further, the second portion 46 of the in-phase bus bar 24w of the W-phase second group 96 is arranged on the upper side of the first portion 44 of the in-phase bus bar 24u of the U-phase second group 96 so as to overlap in the axial direction. The second portion 46 of the in-phase bus bar 24u of the U-phase second group 96 is arranged on the upper side of the first portion 44 of the in-phase bus bar 24v of the second group 96 so as to overlap in the axial direction. Further, the second portion 46 of the in-phase bus bar 24v of the V-phase second group 96 is arranged on the upper side of the first portion 44 of the in-phase bus bar 24w of the W-phase second group 96 so as to overlap in the axial direction.

  Further, the in-phase bus bars 24u, 24v, 24w of the first group 94 of each phase are in the inner row 48 (FIG. 20), and the positions in the circumferential direction are the same as those of the in-phase bus bars 24u, 24v, 24w of the second group 96 of the outer row 50. They are arranged in the same way just by shifting. For this reason, in each in-phase bus bar 24u, 24v, 24w, the intermediate portion arranged in the circumferential bus bar arrangement portion 38 shown in FIG. 20 is the upper and lower sides in the two radial rows of the inner row 48 and the outer row 50. Are arranged in a total of four rows of two rows in the height direction. Further, the circumferential bus bar arrangement portion 38 is more radial in the outer peripheral portion of the stator 10 than the distal end portions of the one-side radial direction derivation portion 70 (FIG. 19) and the other-side radial direction derivation portion 90 that are both ends of the cassette coil 16. Are arranged on the inner side (left side of FIG. 20). The circumferential bus bar arrangement portion 38 extends in the circumferential direction and has a plurality of in-phase bus bars 24u, 24v, 24w and neutral point bus bars 30 (FIGS. 21, 22, 24, 25) described later.

  Next, the neutral point bus bar 30 will be described with reference to FIGS. The three-phase cassette annular portions 18, 20, and 22 are connected by Y connection by a plurality of neutral point bus bars 30 at two locations of the first neutral point N1 and the second neutral point N2 that are separated in the circumferential direction. Yes. First, the second neutral point N2 of the second group 96 formed by the in-phase bus bars 24u, 24v, 24w of the second group 96 (see FIG. 19 for 24w) will be described with reference to FIGS. FIG. 21 is a perspective view of a part of the circumferential direction including the portion D of FIG. 2 as viewed from the outside in the radial direction in the stator of FIG. FIG. 22 is a perspective view seen from above in FIG.

  In order to form the second neutral point N2 of the second group 96, two neutral point bus bars 30, a second UV bus bar Buv and a second UW bus bar Buw, are provided. Hereinafter, the neutral point bus bar 30 may be described with Buv and Buw symbols. As shown in FIGS. 21 and 22, the intermediate portion of the second UV bus bar Buv and the second UW bus bar Buw is the in-phase bus bar 24 u in the circumferential direction part of the outer row 50 and the inner row 48 in the circumferential bus bar arrangement portion 38. , 24v, 24w are provided in portions where they are not arranged. The second UV bus bar Buv is provided at both ends of the connecting portion 52 extending in the radial direction, the first portion 54 and the second portion 56 provided at the intermediate portion and extending in the circumferential direction, and the first portion 54 and the second portion 56. And a connecting portion 58 that is a stepped portion connecting the two. The first portion 54 and the second portion 56 are offset from each other in the radial direction of the stator 10. The first portion 54 is disposed in the upper inner row 48 of the circumferential bus bar arrangement portion 38, and the second portion 46 is disposed in the outer outer row 50 of the circumferential bus bar arrangement portion 38. The connection part 52 on one side (the left side in FIGS. 21 and 22) of the second UV bus bar Buv is overlapped and joined from the lower side to the one-side radial direction lead-out part 70 of the cassette coil 16, which is the U-phase final coil of the second group 96. ing. The connection portion 52 on the other side of the second UV bus bar Buv (the right side in FIGS. 21 and 22) is overlapped and joined to the one-side radial direction lead-out portion 70 of the cassette coil 16 which is the final coil of the V phase of the second group 96 from below. Has been.

  The second UW bus bar Buw is provided with a connecting portion 98 provided at both ends and extending in the radial direction, a first portion 100 and a second portion 102 provided at an intermediate portion and extending in the circumferential direction, and the first portion 100 and the second portion 102. And a connecting portion 104 that is a stepped portion connecting the two. The first portion 100 and the second portion 102 are displaced from each other in the height direction that is the axial direction of the stator 10. The first portion 100 is arranged in the lower outer row 50 of the circumferential bus bar arrangement portion 38, and the second portion 102 is arranged in the upper outer row 50 of the circumferential bus bar arrangement portion 38. A part of the first portion 100 of the second UW bus bar Buw overlaps with the second portion 56 of the second UV bus bar Buv in the height direction.

  The connecting portion 104 of the second UW bus bar Buw is inclined with respect to the circumferential direction, and is disposed above the first portion 44 so as to avoid the first portion 44 of the U-phase in-phase bus bar 24u of the second group 96. The connection part 98 on one side of the second UW bus bar Buw (the left side in FIGS. 21 and 22) is overlapped and joined to the connection part 52 on one side of the second UV bus bar Buv from below. The connection portion 98 on the other side of the second UW bus bar Buw (right side in FIGS. 21 and 22) is overlapped and joined to the one-side radial direction lead-out portion 70 of the cassette coil 16 which is the final coil of the W phase of the second group 96 from below. Has been. The connection portion of the second UV bus bar Buv, the second UW bus bar Buw, and the cassette coil 16, which is the U-phase final coil of the second group 96, forms a second neutral point N2.

  FIG. 23 is a schematic diagram showing the bus bar arrangement configuration in the bus bar arrangement part of FIG. 21, the radial direction derivation part of each phase, and the connection part of the neutral point bus bar. In FIG. 23, the upper block shows the connecting portion of the neutral point N2 of the second group 96, and the lower block shows the upper and lower inner rows 48 and outer rows 50 in the circumferential bus bar arrangement portion 38. Yes. As described above, the connecting portion of the neutral point N2 of the second group 96 is formed by the two bus bars Buv and Buw, and “U-V phase (middle)” indicates the second UV bus bar Buv. “U-W phase (middle)” indicates the second UW bus bar Buw. Further, in the second UV bus bar Buv, an inner / outer offset that is shifted between the inner row 48 and the outer row 50 is made in the middle portion. Further, in the second UW bus bar Buw, a vertical offset that is shifted to the upper row and the lower row in the middle part is provided. As a result, the intermediate portions arranged in the circumferential bus bar arrangement portion 38 of the second UV bus bar Buv and the second UW bus bar Bw which are neutral point bus bars are the upper side and the second side in the radial direction of the inner row 48 and the outer row 50. It is arranged in a total of 4 rows of 2 rows in the lower height direction.

  Next, the first neutral point N1 of the first group 94 formed by the in-phase bus bars 24u, 24v, 24w of the first group 94 will be described with reference to FIGS. 24 is a perspective view of a part of the circumferential direction including the F portion of FIG. 2 as viewed from the radially outer side in the stator of FIG. FIG. 25 is a perspective view seen from above in FIG.

  In order to form the first neutral point N1 of the first group 94, two neutral point bus bars 30, that is, a first UW bus bar Cuw and a first VW bus bar Cvw are provided. Hereinafter, the neutral point bus bar 30 may be described with reference numerals of Cuw and Cvw. As shown in FIG. 24 and FIG. 25, the intermediate portion of the first UW bus bar Cuw and the first VW bus bar Cvw is the in-phase bus bar 24 u in the circumferential direction part of the outer row 50 and the inner row 48 in the circumferential bus bar arrangement portion 38. , 24v, 24w are provided in portions where they are not arranged. The first UW bus bar Cuw includes a connecting portion 106 provided at both ends and extending in the radial direction, a first portion (not shown) and a second portion 110 provided in the intermediate portion and extending in the circumferential direction, and the first UW bus bar Cuw. It includes a connecting portion 112 that is a step portion that connects the first portion and the second portion 110 to each other. The first portion and the second portion 110 of the first UW bus bar Cuw are displaced from each other in the height direction that is the vertical direction of the stator 10. The first portion is arranged in the lower inner row 48 of the circumferential bus bar arrangement portion 38, and the second portion 110 is arranged in the upper inner row 48 of the circumferential bus bar arrangement portion 38. The connecting portion 112 of the first UW bus bar Cuw is inclined with respect to the circumferential direction, and is disposed avoiding other in-phase bus bars of the first group 94. The connection portion 106 on one side of the first UW bus bar Cuw (the left side in FIGS. 24 and 25) is overlapped and joined from the upper side to the other radial direction lead-out portion 90 of the cassette coil 16 which is the final coil of the U phase of the first group 94. ing. The connecting portion 106 on the other side of the first UW bus bar Cuw (the right side in FIGS. 24 and 25) is overlapped and joined to the other-side radial direction deriving portion 90 of the cassette coil 16 which is the final coil of the W phase of the first group 94 from above. Has been.

  The first VW bus bar Cvw is provided at both end portions thereof and extending in the radial direction. The first portion 116 and the second portion 118 are provided at the intermediate portion and extend in the circumferential direction. The first portion 116 and the second portion 118 are provided. And a connecting portion 120 that is a stepped portion connecting the two. The first portion 116 and the second portion 118 are offset from each other in the radial direction of the stator 10. The first portion 116 is arranged in the lower inner row 48 of the circumferential bus bar arrangement portion 38, and the second portion 118 is arranged in the lower outer row 50 of the circumferential bus bar arrangement portion 38. A part of the first portion 116 of the first UW bus bar Cuw overlaps the first portion 116 of the first VW bus bar Cvw in the height direction. The connection portion 114 on one side (the left side in FIGS. 24 and 25) of the first VW bus bar Cvw is overlapped and joined from the upper side to the other radial direction lead-out portion 90 of the cassette coil 16, which is the final coil of the V phase of the first group 94. ing. The connection part 114 on the other side of the first VW bus bar Cvw (right side in FIGS. 24 and 25) is overlapped and joined to the connection part 106 on the other side of the first UW bus bar Cuw from above. The connection portion of the first UW bus bar Cuw, the first VW bus bar Cvw, and the cassette coil 16 which is the final coil of the W phase of the first group 94 forms a first neutral point N1.

  FIG. 26 is a schematic diagram showing the bus bar arrangement configuration in the bus bar arrangement part of FIG. 24, the radial direction derivation part of each phase, and the connection part of the neutral point bus bar. In FIG. 26, the lower block shows the connecting portion of the neutral point N1 of the first group 94, and the upper block shows the upper and lower inner rows 48 and outer rows 50 in the circumferential bus bar arrangement portion 38. Yes. As described above, the connecting portion of the neutral point N1 of the first group 94 is formed by the two bus bars Cuw and Cvw, and “U-W phase (middle)” indicates the first UW bus bar Cuw. “VW phase (middle)” indicates the first VW bus bar Cvw. Further, in the first UW bus bar Cuw, a vertical offset shifted in the upper row and the lower row in the middle portion is provided, and in the first VW bus bar Cvw, an inner / outer offset shifted in the middle row 48 and the outer row 50 in the middle portion. As a result, the intermediate portion arranged in the circumferential bus bar arrangement portion 38 of the first UW bus bar Cuw and the first VW bus bar Cvw, which are neutral point bus bars, in the two rows in the radial direction of the inner row 48 and the outer row 50, It is arranged in a total of 4 rows of 2 rows in the lower height direction.

  Since such a stator 10 has an annular structure in which a plurality of cassette coils 16 are connected as described above, cassette annular portions 18, 20, and 22 of each phase can be attached to the stator core 14 in the axial direction. That is, in a state where the phases are combined while being shifted in the circumferential direction, each slot insertion portion 60 is inserted into the plurality of slots 12 of the stator core 14 shown in FIG. 1 with the one-side coil end portion 68 (FIGS. 4 and 5) first. , 62, 64, 66 are inserted in the axial direction from one axial direction side (lower side in FIG. 1) of the stator core 14 to be assembled to the stator core 14. The slot passage portions 82 and 84 (FIGS. 4 and 5) and the second slot passage portions 124 and 126 (FIGS. 4 and 5) provided in the one-side coil end portion 68 are connected to the stator core 14 of the cassette annular portions 18, 20, and 22. When assembled, the inner connecting portion 86 (FIGS. 4 and 5) and the second inner connecting portion 128 (FIGS. 4 and 5) provided in the one-side coil end portion 68 pass through the corresponding slots 12 in the axial direction. Since it is arrange | positioned inside an inner peripheral surface regarding the radial direction of 14, it does not become a hindrance to an assembly | attachment.

  Furthermore, according to such a stator 10, in the circumferential bus bar arrangement portion 38 in which a plurality of bus bars 24u, 24v, 24w, 30 are arranged extending in the circumferential direction, each in-phase bus bar 24u, 24v, 24w and each neutral are arranged. The point bus bar 30 is formed in a staircase shape. For this reason, the freedom degree of arrangement | positioning of several bus-bars 24u, 24v, 24w, 30 can be enlarged in many places of the circumferential direction, and the axis | shaft of bus-bars 24u, 24v, 24w, 30 can be used in the whole circumferential direction bus-bar arrangement | positioning part 38. The number of rows in the radial direction of the bus bars 24u, 24v, 24w, 30 can be reduced to two without increasing the number of rows in the direction, that is, the height direction. For this reason, as shown in FIG. 20 above, the radial dimension of the circumferential bus bar arrangement portion 38 can be reduced, and from the circumferential bus bar arrangement portion 38 to the joint portion by welding of the end portions at both ends of each cassette coil 16. Since the distance can be secured, the stator 10 can be downsized.

  The three-phase cassette annular portions 18, 20, and 22 are connected by a plurality of Y connections to form a double star connection. For this reason, despite the fact that the number of bus bars 24u, 24v, 24w, 30 provided at the same position in the circumferential direction in the circumferential bus bar arrangement part 38 tends to increase, the bus bar 24u, The number of radial rows of bus bars 24u, 24v, 24w, and 30 can be reduced to within two without increasing the number of rows in the axial direction of 24v, 24w, and 30. For this reason, the effect which can achieve size reduction of the stator 10 becomes remarkable. Moreover, it can easily cope with a large current. Further, the eddy loss can be reduced and the workability of the cassette coil 16 can be improved.

  The three-phase cassette annular portions 18, 20, and 22 are Y-connected at the first neutral point N1 and the second neutral point N2, respectively. Among the plurality of cassette coils 16 arranged in the direction, every other plurality of cassette coils 16 in the circumferential direction are connected in series to form a first group 94 connected to the first neutral point N1, and the first group 94 and a plurality of cassette coils 16 adjacent in the circumferential direction are connected in series to form a second group 96 connected to the second neutral point N2. Further, in the first group 94, the radial direction derivation portions 70 and 90 of the cassette coil 16 adjacent in the circumferential direction are connected by a plurality of in-phase bus bars 24u, 24v, and 24w, and the first neutral point from the input end IN side. A plurality of cassette coils 16 are arranged side by side in one circumferential direction toward the N1 side. Further, in the second group 96, the radial direction derivation portions 70 and 90 of the cassette coil 16 adjacent in the circumferential direction are connected by the plurality of in-phase bus bars 24u, 24v, and 24w, and the second neutral point from the input end IN side. A plurality of cassette coils 16 are arranged side by side in the other circumferential direction toward the N2 side. Therefore, since the three-phase cassette annular portions 18, 20, and 22 are connected by two Y connections, the in-phase bus bars 24u, 24v, and 24w can be shortened. In total, the radial rows of the bus bars 24u, 24v, 24w, 30 can be reduced to within two rows without increasing the axial rows of the bus bars 24u, 24v, 24w, 30 more effectively. For this reason, the size of the stator 10 can be reduced more effectively. Furthermore, since each cassette coil 16 is connected with a separate winding, the generation of harmonic noise can be reduced, and noise and vibration can be reduced. Moreover, since each cassette coil 16 can be comprised by the same shape with which the 1st element 72 and the 2nd element 74 were joined, cost reduction can be achieved.

  In the present embodiment, intermediate portions of the in-phase bus bars 24u, 24v, 24w of the first group 94 are arranged in the inner row 48 of the circumferential bus bar arrangement portion 38, and the in-phase bus bars 24u, 24v, 24w of the second group 96 are arranged. Although the case where the intermediate portion is arranged in the outer row 50 of the circumferential bus bar arrangement portion 38 has been described, the elements arranged in the inner row 48 and the outer row 50 can be reversed. In the present embodiment, the case where all the in-phase bus bars 24u, 24v, 24w and the neutral point bus bar 30 are formed in a staircase shape has been described. However, only some of the bus bars can be formed in a staircase shape. However, it is preferable to form both the in-phase bus bars 24u, 24v, 24w and the neutral point bus bar 30 in a stepped shape from the viewpoint of reducing the number of rows of the bus bars 24u, 24v, 24w, 30 in the circumferential bus bar arrangement portion 38. . The plurality of bus bars 24u, 24v, 24w, 30 may be configured to include a staircase-shaped bus bar that is shifted in the radial direction and a staircase-shaped bus bar that is shifted in the axial direction. This is preferable in terms of effectively reducing the number of rows of bus bars 24u, 24v, 24w, and 30.

  Next, FIG. 27 is a view corresponding to FIG. 11, showing another example of the rotating electrical machine when a plurality of cassette coils are connected by double star connection. FIG. 28 shows a plurality of single-phase components for explaining voltage changes in the cassette coil 16 of the first group 94 and the second group 96 when the rotor is moved to the upper left of FIG. FIG. 6 is a circuit diagram of the cassette coil 16 of FIG. As shown in FIG. 27, in the above-described embodiment, when the cassette coils 16 of each phase are connected by double star connection, they are divided by a quarter turn, respectively in the first group 94 and the second group 96. It is also conceivable to arrange the half cassette coils 16 opposite to each other in the radial direction. In this case, the element A4 of the first group 94 is connected to the element A5 of the first group 94 on the radially opposite side by the in-phase bus bar 24u, and the element B4 of the second group 96 is the element of the second group 96 on the radially opposite side. B5 is connected by an in-phase bus bar 24u.

  In such a configuration, for example, as shown in FIG. 27, when the rotor 32 with the permanent magnet 34 is disposed opposite to the inside of the stator 10, the central axis O of the rotor 32 is the upper left of FIG. 27 (FIG. 27 , The rotor 32 approaches the elements 1A to 4A of the first group 94, as shown in FIG. 28, the voltage (induced voltage) rises. Conversely, since the rotor 32 is separated by the elements 5A to 8A, the voltage decreases. However, since the total voltage of the first group 94 is the same as that of the second group 96, a large voltage difference does not occur between the first group 94 and the second group 96, and the first group 94 and the second group 96 No circulating current is generated between the group 96. On the other hand, in this configuration, some in-phase bus bars 24u are considerably long, and a plurality of bus bars 24u in the circumferential bus bar arrangement portion 38 are partially arranged in three rows in the radial direction, which may increase the radial dimension. . For this reason, in terms of reducing the size of the stator 10, it is inferior to the case of the present embodiment. However, by forming at least a part of the bus bar 24u in a staircase shape, there is a possibility that the number of rows in the radial direction of the circumferential bus bar arrangement part 38 can be reduced in a part in the circumferential direction. Other configurations and operations are the same as those in the above embodiment.

  Next, FIG. 29 is a figure corresponding to FIG. 2 which shows the stator of another example of embodiment of this invention. FIG. 30 is a diagram of a part of the circumferential direction including the G portion of FIG. 29 as viewed from the outside in the radial direction in the stator of FIG. FIG. 31 is a view of a portion of the stator in FIG. 29 including a portion H in FIG. 29 as viewed from the outside in the radial direction.

  In the stator 10 of the present embodiment, in the embodiment shown in FIGS. 1 to 13 and 17 to 26 described above, the intermediate portion arranged in the circumferential bus bar arrangement portion 38 of some neutral point bus bars 30 has a stepped shape. Not formed. For example, as shown in FIG. 30, the intermediate portion of the first VW bus bar Cvw for forming the first neutral point N1 is simply a shape extending in the circumferential direction, which is different from the embodiment shown in FIGS. It is not a shape in which both side portions shifted in the radial direction are connected by a stepped portion. For this reason, the first VW bus bar Cvw is arranged outside the third row in the radial direction of the circumferential bus bar arrangement portion 38, and the radial rows are increased.

  Further, as shown in FIG. 31, the second UV bus bar Buv is arranged further radially outward of the second UW bus bar Buw arranged in the upper outer row 50 for forming the second neutral point N2. In this configuration, both the second UW bus bar Buw and the second UV bus bar Buv have an intermediate portion arranged in the circumferential bus bar arrangement portion 38 having a simple shape extending in the circumferential direction, unlike the embodiments shown in FIGS. The portion shifted in the radial direction or the axial direction is not shaped to be connected by the stepped portion. For this reason, the radial direction row | line | column of the circumferential direction bus-bar arrangement | positioning part 38 is three rows in the part which 2nd UV bus-bar Buv and 2nd UW bus-bar Bw overlap in a radial direction. In such a configuration, a part of the circumferential bus bar arrangement portion 38 has three rows in the radial direction, and the stator 10 is smaller than the embodiment shown in FIGS. 1 to 13 and 17 to 26 described above. It is inferior in terms of conversion. However, each in-phase bus bar 24u, 24v, 24w is formed in a staircase shape, and without increasing the number of axial rows of bus bars 24u, 24v, 24w, 30 in many parts of the circumferential bus bar arrangement portion 38, The radial rows of the bus bars 24u, 24v, 24w, 30 can be reduced to within two rows. Other configurations and operations are the same as those in the above embodiment.

  Note that at least a part of the bus bars can be formed in a staircase shape with the single star connection configuration shown in FIG. 14 or the double star connection configuration shown in FIGS. 15 and 16. Although not shown, in the embodiment shown in FIGS. 1 to 13 and 17 to 26 described above, the first group 94 and the second group 96 are both neutral phase N1 from the input end IN side in each phase. A plurality of cassette coils 16 are arranged side by side in the circumferential direction toward the N2 side, and the positions of the input end IN and the neutral points N1 and N2 are shifted in the circumferential direction in the first group 94 and the second group 96. In the case of the configuration, at least a part of the bus bars can be formed in a staircase shape.

  10 stators, 12 slots, 14 stator cores, 16 conductor cassette coils, 18, 20, 22 cassette annular parts, 24u, 24v, 24w in-phase bus bars, 30 neutral point bus bars, 32 rotors, 34 permanent magnets, 36 connecting parts, 38 turns Directional busbar arrangement part, 40, 42 connection part, 44 first part, 46 second part, 48 inner row, 50 outer row, 52 connection part, 54 first part, 56 second part, 58 coupling part, 60 one side slot Insertion part, 62 One side intermediate slot insertion part, 64 Other side intermediate slot insertion part, 66 Other side slot insertion part, 68 One side coil end part, 70 One side radial direction lead-out part, 72 First element, 74 Second element, 78, etc. Side intermediate radial direction lead-out portion, 80 first connecting element, 82, 84 slot passage portion, 86 inner connecting portion, 88 one-side intermediate diameter Direction deriving portion, 90 other-side radial direction deriving portion, 92 second connecting element, 94 first group, 96 second group, 98 connecting portion, 100 first portion, 102 second portion, 104 connecting portion, 106 connecting portion, 110 2nd part, 112 connection part, 114 connection part, 116 1st part, 118 2nd part, 120 connection part.

Claims (6)

A stator core having slots provided at a plurality of locations in the circumferential direction;
A plurality of cassette annular portions that are axially mounted on the stator core and arranged concentrically with each other,
The cassette annular portion of each phase includes a plurality of stator coils wound around the stator core and connected annularly to each other,
In the cassette annular portion of each phase, the radial lead-out portion provided to extend in the radial direction at the radial outer ends of the plurality of stator coils is connected by a plurality of in-phase bus bars provided on the outer peripheral portion,
The cassette annular portions of the plurality of phases are connected by a plurality of neutral point bus bars provided on the outer peripheral portion,
In the circumferential direction bus bar arrangement portion in which a plurality of in-phase bus bars and neutral point bus bars are arranged extending in the circumferential direction at the outer peripheral portion, at least some of the in-phase bus bars and the neutral point bus bars are formed in a staircase shape. A concentric cassette type rotating electric machine stator characterized by the above. In the concentric cassette type rotating electrical machine stator according to claim 1,
The bus bar formed in a staircase shape includes a first portion and a second portion that are shifted in a height direction or a radial direction that is an axial direction of the stator, and a step portion that connects the first portion and the second portion. A concentric cassette type rotating electrical machine stator. In the concentric cassette type rotating electrical machine stator according to claim 1 or 2,
The multi-phase cassette annular portion is connected by a plurality of Y-connections. In the concentric cassette type rotating electrical machine stator according to any one of claims 1 to 3,
The cassette annular portion of each phase includes a plurality of conductor cassette coils which are stator coils arranged at a plurality of locations in the circumferential direction,
Each conductor cassette coil has a radial direction derivation portion provided at both ends, and a plurality of slot insertion portions that are connected to each radial direction derivation portion and are inserted into slots separated from each other,
In the cassette annular portion of each phase, the radial lead-out portions of the plurality of conductor cassette coils are connected to the radial lead-out portion provided at the end of another conductor cassette coil by an in-phase bus bar. Core cassette rotating electrical machine stator. In the concentric cassette type rotating electrical machine stator according to claim 4,
Each conductor cassette coil has a one-side radial lead-out portion provided on one circumferential side, and is wound around a part of the stator core in the circumferential direction a plurality of times so as to be inserted into two slots separated in the circumferential direction. A first element and a second radial direction lead-out portion provided on the other side in the circumferential direction, and are wound around a part in the circumferential direction of the stator core a plurality of times so as to be inserted into two slots separated in the circumferential direction. Two elements, and the opposite end of the first element with respect to the one-side radial direction derivation portion and the opposite end of the second element with respect to the other-side radial direction derivation portion are connected,
A concentric cassette type rotating electrical machine stator, wherein the slot insertion portion of the first element and the slot insertion portion of the second element are inserted into slots shifted in the circumferential direction. In the concentric cassette type rotating electrical machine stator according to claim 5,
The multi-phase cassette annular portion is Y-connected at the first neutral point and the second neutral point,
In the cassette annulus of each phase,
Among the plurality of conductor cassette coils arranged in the circumferential direction, every other plurality of conductor cassette coils in the circumferential direction are connected in series to form a first group connected to the first neutral point, A plurality of conductor cassette coils adjacent in the circumferential direction are connected in series to form a second group connected to the second neutral point,
In the first group, radial lead-out portions of conductor cassette coils adjacent in the circumferential direction are connected by a plurality of in-phase bus bars, and the plurality of conductor cassette coils are circumferentially directed from the input end side toward the first neutral point side. Arranged in one direction,
In the second group, radial lead-out portions of conductor cassette coils adjacent in the circumferential direction are connected by a plurality of in-phase bus bars, and the plurality of conductor cassette coils are circumferentially directed from the input end side toward the second neutral point side. A concentric cassette type rotating electrical machine stator, which is arranged side by side in the other direction.