JP2014042402A - Rotary electric machine - Google Patents

Abstract

The present invention proposes a configuration that can prevent a coil (cassette coil) from being displaced toward the inner periphery.
A plurality of cassette coils 61 are respectively attached to a plurality of teeth 44 of a stator core 42 and connected to form an electric circuit to form a three-phase coil 60. The inner circumference of the coil end of the three-phase coil 60 is provided. The holding ring 70 is arranged so that the outer peripheral side abuts on the side portion. Thereby, it can suppress more that the three-phase coil 60 shifts | deviates to an inner peripheral side by a repulsive force.
[Selection] Figure 2

Description

  The present invention relates to a rotating electrical machine.

  Conventionally, a covering member having a shape adapted to the shape of the stator is attached from both sides in the axial direction of the stator, and in that state, the coil element is inserted into the salient pole on the inner peripheral side of the stator, and the arm of the pressing member is the coil element and the covering member The coil element, the pressing member, and the covering member are held at predetermined positions of the salient poles by pushing the pressing member so as to pass through the clearance and engaging the locked portion of the arm and the locking portion of the covering member. The technique to make is proposed (for example, refer patent document 1). According to this technique, it is possible to simply attach and hold the coil element to the salient pole by such a method.

JP 2002-305851 A

  In the above-described technology, the engagement between the locked portion of the arm and the locking portion of the covering member prevents the coil element from being displaced (jumped out) to the inner peripheral side by a repulsive force (so-called springback force). . However, when the repulsive force of the coil element is large (using a coil element having a large repulsive force), it may be difficult to ensure sufficient strength by engaging the locked portion of the arm and the locking portion of the covering member. is there. For this reason, in order to prevent a coil element from shifting | deviating to an inner peripheral side, devising another structure is made into the subject.

  The main purpose of the rotating electrical machine of the present invention is to propose a configuration that can prevent the coil (cassette coil) from shifting to the inner peripheral side.

  The rotating electrical machine of the present invention employs the following means in order to achieve the main object described above.

The rotating electrical machine of the present invention is
A rotating electrical machine including a stator in which a coil is wound around a plurality of teeth on the inner peripheral side of a stator core,
The coil is configured by connecting a plurality of cassette coils respectively attached to the plurality of teeth so that an electric circuit is formed,
An annular holding member is arranged so that the outer peripheral side abuts on the inner peripheral side of the coil end of the coil.
This is the gist.

  In the rotating electrical machine of the present invention, the coil is configured such that a plurality of cassette coils respectively mounted on a plurality of teeth are connected to form an electric circuit, and the outer peripheral side abuts on the inner peripheral side of the coil end of the coil. An annular holding member is arranged. Thereby, the robustness with respect to the repulsive force (what is called a springback force) of a coil (cassette coil) can be aimed at. As a result, it is possible to suppress the coil (cassette coil) from shifting (jumping out) to the inner peripheral side. In addition, the heat dissipation of a coil is securable by making only the inner peripheral side of a coil end contact | abut to a holding member.

  In such a rotating electrical machine according to the present invention, the cassette coil is a flat coil double-layered cassette coil, and the holding member is an inner periphery of a coil end on the connection side where the cassette coils are connected to each other when viewed from the stator core. It can also be arranged so that the outer peripheral side abuts on the side. This is because the coil end on the connection side tends to have a larger repulsive force than the coil end on the opposite side across the stator core.

  In the rotating electrical machine of the present invention, the holding member may have a contact surface with the coil formed in a polygonal shape. If it carries out like this, positioning of the holding member with respect to a coil can be performed easily.

  In the rotating electrical machine according to the present invention in which the holding member is arranged so that the outer peripheral side abuts on the inner peripheral side of the coil end on the connection side, the holding member is formed with flanges on the outer peripheral side of both end portions in the axial direction. The coil may be cooled by being supplied with a cooling liquid from above the coil end on the connection side. In this case, since the coil flows along a flow path (flow path formed by the outer peripheral surface of the central portion in the axial direction of the holding member and the flange) having the flanges at both ends of the holding member as side walls, the coil is cooled more sufficiently. can do.

It is a block diagram which shows the outline of a structure of the motor 20 as a rotary electric machine which is one Example of this invention, and the cooling system 90 which cools the motor 20. FIG. FIG. 3 is a configuration diagram showing an outline of a configuration of a stator 40. It is a disassembled perspective view which decomposes | disassembles and shows the stator 40. FIG. FIG. 3 is a peripheral view showing a periphery of a protrusion 82 of a coil snap 80 (a region A in FIG. 2). FIG. 3 is a peripheral view showing the periphery of a pressing ring 70 (the periphery of a region B in FIG. 2). 2 is a configuration diagram showing an outline of the configuration of an insulator 50. FIG. FIG. 5 is a configuration diagram showing an outline of a configuration of a pressing ring 170. FIG. 3 is a configuration diagram showing an outline of a configuration of a stator 140 in which a pressing ring 170 is arranged so that an outer peripheral side comes into contact with an inner peripheral side portion of a coil end of a three-phase coil 60. FIG. 3 is a configuration diagram showing an outline of a configuration of a stator 140 in which a pressing ring 170 is arranged so that an outer peripheral side comes into contact with an inner peripheral side portion of a coil end of a three-phase coil 60.

  Next, the form for implementing this invention is demonstrated using an Example.

  FIG. 1 is a configuration diagram showing an outline of the configuration of a motor 20 as a rotating electrical machine according to an embodiment of the present invention and a cooling system 90 for cooling the motor 20, and FIG. FIG. 3 is an exploded perspective view showing the stator 40 in an exploded state, and FIG. 4 is a periphery showing the vicinity of the protrusion 82 of the coil snap 80 of the stator 40 (the periphery of the region A in FIG. 2). 5 is a peripheral view showing the periphery of the pressing ring 70 of the stator 40 (the vicinity of the region B in FIG. 2), and FIG. 6 is a schematic diagram showing the schematic configuration of the insulator 50 of the stator 40. 2, 3, and 5 show the stator 40 of FIG. 1 viewed from the right front side, and FIG. 4 shows the stator 40 of FIG. 2, a different direction from FIGS. 3 and 5).

  The motor 20 of the embodiment is configured as a well-known three-phase AC motor, and as shown in FIG. 1, the rotor 30 attached to the rotary shaft 22 and the stator core 42 are arranged on the outer periphery side of the rotor 30. And a stator 40 on which a phase coil 60 is wound by a concentrated winding method. The cooling system 90 includes a cooling pipe 91 in which a cooling liquid such as cooling oil pumped by a pump (not shown) flows and a pipe hole 92 is formed vertically above the coil end of the three-phase coil 60. In the embodiment, the cooling liquid flows through the cooling pipe 91 and is discharged from the pipe hole 92 to the coil end of the three-phase coil 60, whereby the three-phase coil 60 is cooled.

  The rotor 30 includes a rotor core 32 formed by laminating a plurality of non-oriented electrical steel sheets, and a plurality of permanent magnets (not shown) that are respectively inserted into a plurality of slots of the rotor core 32.

  As shown in FIGS. 1 to 3, the stator 40 is fitted into a stator core 42 formed by laminating a plurality of non-oriented electrical steel sheets and a plurality of teeth 44 on the inner peripheral side of the stator core 42. An insulator 50 (see FIG. 6), a three-phase coil 60 constituted by a plurality of cassette coils 61 respectively attached to the plurality of insulators 50, and an annular shape arranged on the inner peripheral side of the coil end of the three-phase coil 60 A holding ring 70 as a holding member, and a coil snap 80 for restricting movement of the holding ring 70 in the axial direction.

  Each of the plurality of insulators 50 is formed of resin, and as shown in FIG. 6, a main body 51 that is formed so as to be aligned with the teeth 44 and has a cassette coil 61 mounted on the outside, and the main body 51 The nail | claw part 52 which protrudes from an inner side, and the protrusion part 53 which protrudes in the left side from the edge part of the front left side of FIG. The insulator 50 is fixed to the tooth 44 by fitting the claw portion 52 inside the main body 51 into a groove (not shown) formed in the tooth 44 when the insulator 50 is fitted into the tooth 44.

  Each of the plurality of cassette coils 61 is configured as a rectangular coil double-layered cassette coil, and is formed so that both end portions 62 are in the same direction. The three-phase coil 60 is mounted on the teeth 44 via the insulator 50 so that the plurality of cassette coils 61 are aligned in the same direction (right direction in FIGS. 2 and 3) when the end 62 is viewed from the stator core 42. Each end 62 of the plurality of cassette coils 61 is connected to form a three-phase electric circuit. Hereinafter, the side (right side in FIGS. 2 and 3) where the plurality of cassette coils 61 are connected to each other when viewed from the stator core 42 is referred to as a connection side, and the opposite side is referred to as a non-connection side.

  When the cassette coil 61 is mounted on the teeth 44, the cassette coil 61 may be mounted on the main body 51 of the insulator 50 and then the insulator 50 may be fitted into the teeth 44 and fixed. The cassette coil 61 may be attached to the insulator 50 after being fitted into the teeth 44 and fixed.

  The holding ring 70 is made of resin, and as shown in FIG. 3, the outer diameter is slightly larger than the inner diameter of the coil end on the connection side of the three-phase coil 60 before the holding ring 70 is arranged. The peripheral side is circular and the outer peripheral side is formed in a polygon. The pressing ring 70 is arranged so that the outer peripheral side abuts on the inner peripheral side of the connection-side coil end of the three-phase coil 60. The retaining ring 70 can improve the robustness against the repulsive force (so-called springback force) of the three-phase coil 60, and further prevent the three-phase coil 60 from being displaced (flying out) by the repulsive force. can do. In the embodiment, the rectangular coil double-layered cassette coil 61 is used, so that the repulsive force of the three-phase coil 60 tends to increase (particularly, the repulsive force of the coil end on the connection side increases) By this pressing ring 70, it is possible to further prevent the three-phase coil 60 from being displaced (jumped out) to the inner peripheral side by a repulsive force. Further, by forming the outer periphery side of the pressing ring 70 in a polygonal shape, it is possible to easily position the pressing ring 70 with respect to the three-phase coil 60. Furthermore, only the inner peripheral side of the coil end on the connection side is in contact with the holding ring 70, so that the heat dissipation of the three-phase coil 60 can be ensured. In order to suppress the displacement of the three-phase coil 60 toward the inner peripheral side more effectively, the presser ring 70 has an outer peripheral side that is in contact with the inner peripheral side of the connection-side coil end near the stator core 42. It is preferable to arrange so that it contacts.

  Each of the plurality of coil snaps 80 is made of resin, and as shown in FIG. 3, the width is slightly narrower than the width between the end portions on the inner peripheral side of the adjacent teeth 44, and the length in the axial direction of the teeth 44. The main body 81 is formed in a slightly longer flat shape, and the left end of the main body 81 in FIG. 3 (one end in the axial direction) is arranged in the circumferential direction of FIG. 3 is formed on the right end of FIG. 3 (the other end in the axial direction) of the main body 81 and is arranged in an annular shape (circular shape). 3 is formed on the outer peripheral side of FIG. 3 of the main body 81 (outer peripheral side when arranged in an annular shape), and is formed on the right side of FIG. And a claw portion 84 that protrudes and bends to the inner peripheral side. When the coil snap 80 is inserted from the non-connection side of the stator core 42 so that the main body portion 81 fills the gap between the teeth 44, the protruding portion 82 is located outside the main body portion 51 of the insulator 50 as shown in FIG. The movement in the right direction and the inner peripheral side is restricted by the surface (the left surface in FIG. 4) and the outer peripheral surface (the rear surface in FIG. 4) of the protrusion 53. Further, as shown in FIG. 5, the movement of the pressing ring 70 in the axial direction can be restricted by sandwiching the pressing ring 70 between the bent portion 83 and the claw portion 84 of the coil snap 80.

  According to the motor 20 of the embodiment described above, a plurality of cassette coils 61 are respectively attached to a plurality of teeth 44 of the stator core 42 and are connected so as to form an electric circuit. Since the holding ring 70 is disposed so that the outer peripheral side abuts on the inner peripheral side portion of the coil end of the coil 60, the three-phase coil 60 can be further prevented from being displaced to the inner peripheral side by the repulsive force. Further, by forming the outer peripheral side of the pressing ring 70 in a polygonal shape, the positioning of the pressing ring 70 with respect to the three-phase coil 60 can be easily performed.

  In the motor 20 of the embodiment, the outer peripheral side of the pressing ring 70 is formed in a polygonal shape, but may be formed in a circular shape.

  In the motor 20 of the embodiment, the holding ring 70 is arranged so that the outer peripheral side abuts on the inner peripheral side of the coil end on the connection side, but instead of or in addition to this, the inner side of the coil on the non-connection side is arranged. It is good also as what is arrange | positioned so that an outer peripheral side contact | abuts to the peripheral side.

  In the motor 20 of the embodiment, as shown in FIG. 3, the pressing ring 70 is formed in a circular shape on the inner peripheral side and a polygonal shape on the outer peripheral side. However, as shown in the pressing ring 170 in FIG. It is good also as what the flanges 171 and 172 are formed in the outer peripheral side of both ends. In the holding ring 170 of this modification, the flange 171 has a polygonal outer peripheral side, and the flange 172 has an outer diameter larger than the flange 171 and a circular outer peripheral side. FIGS. 8 and 9 are schematic diagrams showing a schematic configuration of the motor 120 including the stator 140 when the pressing ring 170 is used instead of the pressing ring 70. FIG. 9 shows the motor 20 and the cooling system 90 of FIG. 8 as viewed from the right side, but is hatched in consideration of easy viewing. In this modification, as shown in FIG. 8, the holding ring 170 is disposed so that the outer peripheral side of the flange 171 contacts the inner peripheral side of the coil end on the connection side of the three-phase coil 60. When this holding ring 170 is used, the cooling liquid discharged from the pipe hole 92 of the cooling pipe 91 flows along the flow path having the flanges 171 and 172 as side walls (the outer peripheral surface of the portion other than the flanges 171 and 172 of the holding ring 170. It flows along the flow path formed by the flanges 171 and 172 (see FIG. 8) and falls by gravity (see FIG. 9). Thereby, compared with the case where a ring is not used or the case where the holding ring 70 of an Example is used, it can suppress that a cooling fluid slips through the three-phase coil 60, and falls, and the three-phase coil 60 is made more fully. Can be cooled to.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the stator core 42 corresponds to the “stator core”, the tooth 44 corresponds to the “tooth”, the three-phase coil 60 corresponds to the “coil”, the cassette coil 61 corresponds to the “cassette coil”, and the holding ring 70 corresponds to a “holding member”.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. Therefore, the elements of the invention described in the column of means for solving the problems are not limited. That is, the interpretation of the invention described in the column of means for solving the problems should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problems. It is only a specific example.

  As mentioned above, although the form for implementing this invention was demonstrated using the Example, this invention is not limited at all to such an Example, In the range which does not deviate from the summary of this invention, it is with various forms. Of course, it can be implemented.

  The present invention can be used in the motor manufacturing industry.

  20, 120 Motor, 22 Rotating shaft, 30 Rotor, 32 Rotor core, 40, 140 Stator, 42 Stator core, 44 Teeth, 50 Insulator, 51 Main body part, 52 Claw part, 53 Projection part, 60 Three-phase coil, 61 Cassette coil, 62 End part, 70 Pressing ring, 80 Coil snap, 81 Body part, 82 Projection part, 83 Bending part, 84 Claw part, 90 Cooling system, 91 Cooling pipe, 92 Pipe hole, 170 Ring, 171, 172 Flange

Claims (4)

A rotating electrical machine including a stator in which a coil is wound around a plurality of teeth on the inner peripheral side of a stator core,
The coil is configured such that a plurality of cassette coils respectively attached to the plurality of teeth are connected to form an electric circuit,
An annular holding member is arranged so that the outer peripheral side abuts on the inner peripheral side of the coil end of the coil.
Rotating electric machine. The rotating electrical machine according to claim 1,
The cassette coil is a flat coil double-layered cassette coil,
The holding member is arranged so that the outer peripheral side comes into contact with the inner peripheral side of the coil end on the connection side where the cassette coils are connected to each other when viewed from the stator core.
Rotating electric machine. The rotating electrical machine according to claim 1 or 2,
The holding member has a polygonal contact surface with the coil.
Rotating electric machine. A rotating electric machine according to claim 2,
The holding member is formed with flanges on the outer peripheral side of both end portions in the axial direction,
The coil is cooled by being supplied with a cooling liquid from above the coil end on the connection side,
Rotating electric machine.