JP2014079090A - Bus ring for rotary electric machine stator - Google Patents

Abstract

To provide a bus ring for a stator of a rotating electrical machine capable of reducing the number of wires and improving the yield and making the production equipment versatile.
Bus rings 4U, 4V, 4W for a stator 1 of a rotating electrical machine are a cable terminal in which a plurality of single coils are connected in parallel for each phase coil, and one end side of each phase coil is bound. This is for forming the portion 42. The bus rings 4U, 4V, 4W of the respective phases are arranged at the axial end portions of the stator, have substantially the same cross-sectional area, and are individually formed from the single coils to the cable terminal portions 42, respectively. 41C is formed by overlapping each other in parallel. The number of superposed lines 41 </ b> A to 41 </ b> C of the bus rings 4 </ b> U, 4 </ b> V, and 4 </ b> W of each phase increases as it approaches the cable terminal portion 42.
[Selection] Figure 3

Description

  The present invention relates to a bus ring that connects a plurality of single coils of each phase in parallel for three-phase coils in a stator of a rotating electrical machine.

In a stator formed by arranging a three-phase coil in a slot of a stator core, a bus ring made of a conductor is used to bind ends of the coils of each phase. This bus ring is used when a plurality of single coils forming coils of each phase are connected in parallel.
For example, the bus ring of Patent Document 1 is configured by arranging a plurality of conductive wire rods at different positions in the axial direction and forming an extended portion that is bent to extend in the radial direction on each conductive wire rod. doing. The bus ring is attached along the end face of the stator. Moreover, the gate-shaped bending part which protrudes in an axial direction from the extension part is formed in a conductive wire, and the coil | winding wound around the stator tooth | gear of a stator is connected to the bending part. This reduces the size of the rotating electrical machine.

  Further, for example, in the power distribution component of the motor of Patent Document 2, it is described that a coil connection terminal is integrally provided on a plate-like conductor body of a connection body, and the conductor body is inserted into a groove of an annular holder made of an insulating material. ing. Further, the connection body is formed by performing a punching process on a connection body material made of a copper plate and providing a protruding portion for forming a coil connection terminal.

Japanese Patent No. 4636192 JP 2009-118575 A

However, in the bus ring of Patent Document 1, a plurality of windings are connected to each bent portion, and the entire current to the plurality of windings flows through the bus ring. Therefore, it is necessary to make the bus ring thicker in consideration of the current flowing through the entire plurality of windings.
Further, in the power distribution component of Patent Document 2, since the punching process is performed, the yield of the material is deteriorated. In addition, when different types of rotating electrical machines are formed, or when the specifications of the rotating electrical machines are changed, the shape of the power distribution parts changes greatly, making it difficult to generalize the equipment for manufacturing the power distribution parts.

  The present invention has been made in view of such a background, and can be obtained by providing a bus ring for a stator of a rotating electrical machine that can reduce the number of wires and improve the yield and can make the manufacturing equipment versatile. It is a thing.

One aspect of the present invention is a stator of a rotating electrical machine formed by arranging three-phase coils of a U-phase, a V-phase, and a W-phase in a slot of a stator core, and a plurality of single coils having the same phase for each phase coil. A bus ring that is connected in parallel to form a cable terminal portion in which one axial end side of the plurality of single coils of the same phase is bound,
The bus ring is disposed at the axial end portion of the stator, has substantially the same cross-sectional area, and the individual lines formed from the single coils of the same phase to the cable terminal portion are overlapped in parallel with each other. In the bus ring for a stator of a rotating electrical machine, the number of the above-mentioned filaments to be superposed increases as it approaches the cable terminal portion. (Claim 1) .

The bus ring for a stator of the rotating electrical machine is formed by individually providing a line for each single coil forming a coil of each phase, and superimposing these lines in parallel with each other. For this reason, each line only needs to allow a current flowing through each single coil, and the thickness of each line can be made as thin as possible.
In addition, by using a line having substantially the same cross-sectional area over the entire length, it is not necessary to punch the material, and the yield of the material for manufacturing the bus ring can be improved. Further, the bus ring can be formed by bending the filament. Therefore, even when different types of rotating electrical machines are formed or when the specifications of the rotating electrical machines are changed, it is possible to easily cope with them by changing the length of the filament, the position where the filament is bent, etc. Therefore, it is possible to generalize the facilities for manufacturing the bus ring.

  Therefore, according to the bus ring for the stator of the rotating electrical machine, it is possible to reduce the number of wires and improve the yield, and to make the production equipment versatile.

The perspective view which shows the stator of a rotary electric machine concerning an Example. The perspective view which shows the state which arrange | positions the bus ring for neutral points, an insulator, and a three-phase bus ring with respect to the assembly with which the three-phase coil concerning an Example is arrange | positioned at the stator core. The perspective view which shows the U-phase bus ring by the some filament which connects the whole U-phase single coil concerning an Example in parallel. The perspective view which shows the filament connected to the single coil furthest from a cable terminal part among the several single coils of the same phase concerning an Example. The perspective view which shows the filament connected to the single coil furthest from a cable terminal part among several in-phase single coils concerning an Example. The perspective view which shows the filament connected to the single coil nearest to a cable terminal part among several in-phase single coils concerning an Example. The wiring diagram which shows the state which star-connects the three-phase single coil concerning an Example by the bus ring of each phase, and the bus ring for neutral points.

A preferred embodiment of the above-described bus ring for a stator of a rotating electrical machine will be described.
In the bus ring for the stator of the rotating electric machine, the bus ring is not formed in a perfect ring shape, but is formed in an arc shape in which a circumferential position on the side opposite to the cable terminal portion is separated. Yes. The rotating electrical machine is used as an electric motor, a generator, a motor generator, or the like.

The strip may have a substantially rectangular or flat cross section, and the bus ring may be formed by facing the wide side surfaces of the strip parallel to each other (claims). 2).
In this case, it becomes easy to overlap a plurality of strips in a compact manner, and the bus ring can be downsized.

Moreover, the said bus ring may be comprised so that said each line may be connected by equal number to the both sides of the circumferential direction which pinches | interposes the said cable terminal part (Claim 3).
In this case, it is possible to further facilitate the arrangement by superimposing the striations constituting the bus ring, thereby facilitating the formation of the bus ring.

Moreover, the said bus ring may have the connection part folded in U shape in the part to which the one end side of the said single coil is connected (Claim 4).
In this case, the end of the single coil can be sandwiched and joined to the U-shaped connecting portion, and the single coil can be easily joined to the bus ring.

Hereinafter, embodiments of a bus ring for a stator of a rotating electrical machine will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the bus rings 4U, 4V, 4W for the stator 1 of the rotating electrical machine of the present example are arranged in the U-phase, V-phase, and W-phase three-phase coils 3U, 3V in the slots 21 of the stator core 2. In the stator 1 of the rotating electrical machine formed by arranging 3W, a plurality of single coils 31 are connected in parallel for each phase coil 3U, 3V, 3W, and each phase coil 3U, 3V, 3W It is for forming the cable terminal part 42 which bound one end side.

  As shown in FIG. 3, the bus rings 4U, 4V, 4W of the respective phases are arranged at the axial end portions of the stator 1 (coil end portions of the three-phase coils 3U, 3V, 3W) and have substantially the same cross-sectional area. Lines 41A to 41C that are continuous and individually formed from each single coil 31 to the cable terminal portion 42 are formed to overlap each other in parallel. Further, the number of superposed lines 41 </ b> A to 41 </ b> C of the bus rings 4 </ b> U, 4 </ b> V, and 4 </ b> W of each phase increases as it approaches the cable terminal portion 42.

Hereinafter, the bus rings 4U, 4V, and 4W for the stator 1 of the rotating electrical machine of this example will be described in detail with reference to FIGS.
As shown in FIGS. 1 and 3, the stator core 2 is provided with the same number of coils 3U, 3V, and 3W of U phase, V phase, and W phase in sequence. The bus rings 4U, 4V, 4W of each phase are overlapped with the strips 41A to 41C for binding the coil end portion 311A of each single coil 31 to the cable terminal portion 42 in a state where the two single coils 31 of other phases are skipped. Is formed.

As shown in FIG. 2, three three-phase bus rings 4U, 4V, and 4W are arranged for three-phase coils 3U, 3V, and 3W, respectively, at the end on one axial end side of stator 1 of the rotating electrical machine. The The three-phase coils 3U, 3V, and 3W are star-connected (see FIG. 7), and a neutral point bus ring 5 that forms a neutral point is also provided at one end of the stator 1 in the axial direction. Be placed. Each of the bus rings 4U, 4V, 4W and the neutral point bus ring 5 is formed of a conductive material such as copper or aluminum having good conductivity.
FIG. 7 is a wiring diagram showing a state in which the three-phase single coils 3U, 3V, 3W are star-connected by the bus rings 4U, 4V, 4W and the neutral point bus ring 5 of each phase. In the figure, the neutral point is indicated by the symbol X.

As shown in FIGS. 1 and 2, an insulator 6 is disposed at the end of the stator 1 in the axial direction on one end side to ensure insulation between the phases of the bus rings 4U, 4V, and 4W. The insulator 6 is arranged in four stages in the radial direction. The bus rings 4U, 4V, and 4W are disposed in the gaps formed between the inner and outer insulators 6, and the neutral point bus ring 5 is disposed on the outer periphery of the outermost insulator 6. The
2 shows the assembly 10 in which the three-phase coils 3U, 3V, 3W are arranged on the stator core 2, and the neutral point bus ring 5, the insulator 6, the three-phase bus rings 4U, 4V, The state which arrange | positions 4W is shown.

The neutral point bus ring 5 is formed in a ring shape that sequentially connects the single coils 31 of other phases adjacent to each other. The neutral point bus ring 5 has a plurality of connection portions 51 that connect the coil end portions 311B on the neutral point side of the single coil 31 of each phase at equal intervals in the circumferential direction. The three-phase bus rings 4U, 4V, 4W and the neutral point bus ring 5 are all separated at a circumferential position opposite to the circumferential position where the cable terminal portion 42 is provided, and are formed in an arc shape. Has been.
The three-phase bus rings 4U, 4V, and 4W of this example are arranged so as to overlap in the radial direction at the end portion on one end side in the axial direction of the stator 1. In addition to this, the three-phase bus rings 4U, 4V, and 4W may be arranged so as to overlap in the axial direction at the end of the stator 1 on the one end side in the axial direction.

  FIG. 3 shows a U-phase bus ring 4U by a plurality of strips 41A to 41C connecting the entire U-phase single coil 31 in parallel. As shown in the figure, the U-phase bus ring 4U has a connection portion 43 that is folded back in a U-shape at a portion to which one end of the single coil 31 is connected. The connecting portion 43 is formed by bending the end portions of the filaments 41 </ b> A to 41 </ b> C in a plane direction orthogonal to the axial direction of the stator core 2. Each connection portion 43 is formed in a state where the inner peripheral side portion 431 and the outer peripheral side portion 432 are opposed to each other at the distal end portion of the radial direction portion 430 extending in the radial direction. In each line 41A-41C, each connection part 43 is formed so that the direction folded in a U shape may be located on the same side in the circumferential direction.

  As shown in FIGS. 1 and 3, the coil end portions 311A of the two single coils 31 drawn outward in the axial direction are sandwiched between the inner peripheral portion 431 and the outer peripheral portion 432 of the connection portion 43, The two coil end portions 311A and the connection portion 43 can be joined by performing welding such as fusing. The V-phase and W-phase bus rings 4V and 4W are U-phase except that the outer diameter arranged along the circumferential direction of the stator core 2 and the length of the radial portion 430 of the connecting portion 43 are different. It has the same shape as the bus ring 4U.

  As shown in FIG. 3, the three-phase coils 3U, 3V, 3W of this example are formed by connecting six single coils 31 in parallel for each in-phase coil 3U (3V or 3W). The plurality of wires 41 </ b> A to 41 </ b> C connected to the single coils 31 in the same phase are arranged on the innermost side of the wire 41 </ b> A connected to the single coil 31 farthest from the cable terminal portion 42. It arrange | positions at the outer peripheral side so that it may become the filament 41B, 41C connected to the near single coil 31, and is mutually overlap | superposed on the inner and outer periphery.

  Here, FIG. 4 shows the filament 41A connected to the single coil 31 farthest from the cable terminal portion 42 among the plurality of single coils 31 having the same phase. FIG. 5 shows a wire 41B connected to the single coil 31 that is the second most distant from the cable terminal portion 42 among the plurality of single coils 31 having the same phase. FIG. 6 shows a wire 41 </ b> C connected to the single coil 31 closest to the cable terminal portion 42 among the plurality of single coils 31 having the same phase.

  As shown in FIG. 3, the strips 41A to 41C in this example are squares having a substantially rectangular cross section, and the bus rings 4U, 4V, and 4W of the respective phases are connected to the wider side surfaces of the strips 41A to 41C. It is formed to face in parallel. The bus rings 4U, 4V, 4W of each phase are configured to connect the same number of wires 41A to 41C to both sides in the circumferential direction sandwiching the cable terminal portion 42.

As shown in FIG. 4, the cable terminal portion 42 of this example is formed by extending the ends of the strips 41 </ b> A to 41 </ b> C extending in the circumferential direction in the radial direction. In this example, the wire 41A connected to the single coil 31 located farthest from the cable terminal 42 on one side in the circumferential direction around the cable terminal 42, and the cable terminal on the other side in the circumferential direction. The line portion 41 </ b> A connected to the single coil 31 located farthest from 42 is formed of a single conductor. The line 41A of this single conductor is bent into a circular shape at a position where the cable terminal portion 42 is formed, and forms an attachment portion 421 through which a screw or the like can be inserted.
As shown in FIGS. 5 and 6, the other strips 41 </ b> B and 41 </ b> C are also formed of one conductor in the same manner as the strip 41 </ b> A.

Each of the filaments 41A, 41B, 41C can be used one for each single coil 31, and can be bound using a crimp terminal or the like in the cable terminal portion 42. In this case, the attachment portion 421 is an attachment portion such as a crimp terminal.
Further, instead of using the insulator 6, an insulating member such as an insulating tape around which the strips 41 </ b> A, 41 </ b> B, 41 </ b> C of the bus rings 4 </ b> U, 4 </ b> V, 4 </ b> W of each phase can be wound together. In this case, the stator 1 can be reduced in size by not using the insulator 6.

The bus rings 4U, 4V, 4W for the stator 1 of the rotating electrical machine of this example are provided with the wires 41A to 41C individually for the single coils 31 forming the coils 3U, 3V, 3W of the respective phases. ˜41C are formed by overlapping each other in parallel. Therefore, each line 41A-41C should just allow the electric current which flows through each single coil 31, and can make the thickness of each line 41A-41C as thin as possible.
Further, by using the strips 41A to 41C having substantially the same cross-sectional area over the entire length, it is not necessary to perform punching processing on the material, and the yield of the material for manufacturing the bus rings 4U, 4V, 4W is improved. be able to. Further, the bus rings 4U, 4V, 4W can be formed by bending the strips 41A to 41C. Therefore, even when different types of rotating electrical machines are formed or when the specifications of the rotating electrical machines are changed, it is easy to change the length of the filaments 41A to 41C, the position where the filaments 41A to 41C are bent, and the like. Therefore, the equipment for manufacturing the bus rings 4U, 4V, 4W can be generalized.

  Therefore, according to the bus rings 4U, 4V, and 4W for the stator 1 of the rotating electric machine of this example, it is possible to reduce the number of wires and improve the yield, and to make the manufacturing equipment versatile.

DESCRIPTION OF SYMBOLS 1 Stator of rotary electric machine 2 Stator core 21 Slot 3U, 3V, 3W Three-phase coil 31 Single coil 4U, 4V, 4W Three-phase bus ring 41A-41C Wire 42 Cable terminal part 43 Connection part

Claims (4)

In a stator of a rotating electrical machine formed by arranging U-phase, V-phase, and W-phase coils in slots of a stator core, a plurality of single coils of the same phase are connected in parallel for each phase coil, A bus ring forming a cable terminal portion in which one axial end side of a plurality of single coils of the same phase is bound,
The bus ring is disposed at the axial end portion of the stator, has substantially the same cross-sectional area, and the individual lines formed from the single coils of the same phase to the cable terminal portion are overlapped in parallel with each other. A bus ring for a stator of a rotating electrical machine, characterized in that the number of the above-mentioned filaments to be superimposed increases as the distance from the cable terminal portion increases. The bus ring for the stator of the rotating electrical machine according to claim 1, wherein the filament has a substantially rectangular or flat cross section,
The bus ring for a stator of a rotating electrical machine, wherein the bus ring is formed by facing the wide side surfaces of the line in parallel with each other.   3. A bus ring for a stator of a rotating electrical machine according to claim 1 or 2, wherein the bus ring is configured to connect each of the wires in an equal number on both sides in the circumferential direction sandwiching the cable terminal portion. A bus ring for a stator of a rotating electrical machine.   The bus ring for a stator of a rotating electrical machine according to any one of claims 1 to 3, wherein the bus ring includes a connection portion folded in a U shape at a portion to which one end side of the single coil is connected. A bus ring for a stator of a rotating electric machine, comprising:

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