JP2006174551A - Coil connecting structure of axial gap type rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coil connecting structure of an axial gap type rotating electric machine improvable in insulation performance between adjacent bus bars while employing a bus-bar laminated body as a connecting structure for a stator coil. <P>SOLUTION: The axial gap type rotating electric machine is provided with a rotor 2 arranged with permanent magnets 12, 12, and stators 3, 3 comprising stator cores 14 and stator coils 16, and the rotor 2 and the stators 3, 3 are axially arranged. The stator coils 16 are connected to a plurality of the bus bars 31 that are concentrically laminated and arranged in the radial direction with respect to axial bus bar grooves 30a formed at a bus bar case 30 composed of an insulating material, and the inclined bus-bar laminated body 18 arranged stepwise by axially displacing the plurality of bus bars 31 is arranged. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention belongs to the technical field of a coil connection structure of an axial gap type rotating electrical machine in which a stator and a rotor are arranged to face each other in the axial direction.

  The permanent magnet synchronous motor (IPMSM: Interior Permanent Magnet Synchronus Motor) with a permanent magnet embedded in the rotor and the surface magnet synchronous motor (SPMSM: Surface Permanent Magnet Synchronus Motor) with a permanent magnet attached to the rotor surface have low loss. Due to its high efficiency and large output (in addition to magnet torque, reluctance torque can also be used), its application range has been expanded to applications such as electric vehicle motors and hybrid vehicle motors.

Such a permanent magnet synchronous motor, in which an axial gap type motor in which a stator and a rotor are arranged to face each other in the axial direction, can be reduced in thickness and is used for applications where layout is limited (for example, patents) Reference 1).
Japanese Patent Laid-Open No. 11-187635

In this conventional axial gap type motor, when an inclined bus bar laminated body is applied as a connection structure to a stator coil, for example, axial direction on the same axis as described in JP-A-2004-129396. The bus bar laminated body laminated | stacked on this is applied.
However, the conventional bus bar laminate is adjacent to the axial bus bar groove formed in the bus bar case made of an insulating material because a plurality of bus bars are provided concentrically and laminated in the same radial direction in the axial direction. If the creepage distance due to the insulating material between the two bus bars is short, high insulation performance is not secured, and a high voltage is applied to the bus bar, a leakage loss occurs between the two bus bars along the short insulating surface. There was a problem that.

  The present invention has been made paying attention to the above-mentioned problem, and is a coil of an axial gap type rotating electrical machine that can improve insulation performance between adjacent bus bars while applying a bus bar laminated body as a connection structure to a stator coil. It aims at providing a connection structure.

In order to achieve the above object, according to the present invention, an axial gap type rotating electrical machine includes a rotor having a permanent magnet disposed thereon, a stator having a stator core and a stator coil, and the rotor and the stator are disposed in an axial direction. ,
The stator coil is connected to a plurality of bus bars provided concentrically and radially stacked with respect to an axial bus bar groove formed in a bus bar case made of an insulating material,
An inclined bus bar laminated body is provided in which the plurality of bus bars are arranged in a staircase pattern while being shifted in the axial direction.

  Therefore, in the coil connection structure of the axial gap type rotating electrical machine according to the present invention, the stator coil is provided concentrically and radially laminated on the axial bus bar groove formed in the bus bar case made of an insulating material. Connected to multiple bus bars. Since the inclined bus bar laminated body in which the plurality of bus bars are shifted in the axial direction and arranged stepwise is provided, the bus bars are adjacent to each other in comparison with the bus bar laminated body in which the plurality of bus bars are arranged on the same axis. The creepage distance due to the insulating material between the two bus bars is long. As a result, it is possible to improve the insulation performance between adjacent bus bars while applying the bus bar laminate as a connection structure to the stator coil.

  Hereinafter, the best mode for carrying out the coil connection structure of the axial gap type rotating electrical machine of the present invention will be described based on Examples 1 to 5 shown in the drawings.

First, the configuration will be described.
FIG. 1 is an overall cross-sectional view showing a 1 rotor / 2 stator type axial gap type rotating electrical machine to which the coil connection structure of the first embodiment is applied, and FIG. 2 is an axial gap type rotation to which the coil connection structure of the first embodiment is applied. It is a front view which shows the stator of an electric machine.
The axial gap type rotating electrical machine according to the first embodiment includes a rotor shaft 1, a rotor 2, a pair of stators 3 and 3, and a rotating electrical machine case 4, and the rotor 2 and the pair of stators 3 and 3. Are arranged opposite to each other in the axial direction.

  The rotor shaft 1 is provided between a first bearing 5 provided between the rotating electrical machine case 4 (front side case 4a) and a second electrical machine case 4 (rear side case 4b). The bearing 6 is rotatably supported. The rotor shaft 1 communicates with an axial oil passage 7, a first radial oil passage 8 that communicates with the axial oil passage 7 and cools the front stator 3, and the axial oil passage 7. A second radial oil passage 9 that cools the rear stator 3 and the second bearing 6, and a third radial oil passage 10 that communicates with the axial oil passage 7 and cools the first bearing 5. Is formed.

  The rotor 2 is fixed to the rotor shaft 1, and the fixed position is a position sandwiched between the pair of stators 3 and 3. The rotor 2 has a rotor plate 11 made of a ferromagnetic material fixed to the rotor shaft 1, and a plurality of permanent magnets 12 and 12 embedded in the circumferential direction at positions facing the pair of stators 3 and 3. Configured. The plurality of permanent magnets 12 and 12 are adjacent to each other so that a reaction force is generated in the permanent magnets 12 and 12 with respect to the rotating magnetic flux applied from the pair of stators 3 and 3 and the rotor shaft 1 is rotated. The surface magnetic poles (N pole, S pole) are arranged so as to be different from each other. Here, an axial gap called an air gap exists between the rotor 2 and the stators 3 and 3 and does not contact each other.

  The stators 3 and 3 are fixed to a front side case 4 a and a rear side case 4 b of the rotating electrical machine case 4, respectively. The stator 3 includes a stator case 13 that is bolted to the side cases 4a and 4b, a stator core 14 made of a laminated steel plate, and a stator coil 16 that is wound around the stator core 14 via an insulator 15. Configured. As shown in FIG. 2, twelve stator cores 14 with stator coils 16 are arranged at equal intervals in the circumferential direction. In addition to the above components, the stator 3 is connected to a core base 17 provided at the base of the stator core 14, an inclined bus bar laminate 18 that is a feeding structure to the stator coil 16, and the inclined bus bar laminate 18. The power transmission terminal 19, the refrigerant gallery 20 formed in the stator case 13, the stator core 14 with the stator coil 16, and the resin mold portion 21 that fills the space of the inclined bus bar laminate 18. In the motor mode, the power transmission terminal 19 converts a direct current from the battery into a three-phase alternating current through a high-voltage unit (not shown) having an inverter, and the three-phase alternating current is transmitted through the inclined bus bar laminate 18. Power is supplied to the stator coil 16. In the generator mode, the three-phase alternating current generated by the stator coil 16 is supplied to a high-power unit (not shown) having an inverter, converted into direct-current by the high-power unit, and charged to the battery.

  The rotating electrical machine case 4 includes a front side case 4a, a rear side case 4b, and an outer case 4c that is bolted to both side cases 4a and 4b. As shown in FIG. 1, the front side case 4 a and the rear side case 4 b include a refrigerant supply port 22 that supplies a refrigerant (for example, cooling oil) to the refrigerant gallery 20, and a refrigerant gallery 20. A refrigerant discharge port 23 for discharging the refrigerant that has taken heat from the stator 3 is formed.

FIG. 3A is a cross-sectional view of a main part showing a coil connection structure of the axial gap type rotating electric machine according to the first embodiment. Hereinafter, a coil connection structure using the inclined bus bar laminated body 18 of the first embodiment will be described with reference to FIG.
The inclined bus bar laminate 18 is formed by shifting a plurality of bus bars 31 concentrically and radially laminated with respect to the axial bus bar groove 30a formed in the bus bar case 30 made of an insulating material in the axial direction. They are arranged in steps. Each of the plurality of bus bars 31 shares the U phase, the V phase, the W phase, and the neutrality, and in order to supply three-phase alternating current to the twelve stator coils 16, the U phase bus bar and the V phase in the circumferential direction. The bus bar and the W-phase bus bar are connected four times while repeating the order, and the neutral bus bar is connected to all the stator coils 16 (see FIG. 2). Note that the neutral bus bar can be omitted.

  The inclined bus bar laminate 18 has a long axial distance between the inner peripheral bus bar 31 and the rotor center line among the plurality of bus bars 31 arranged in a staircase shape, and the outer peripheral bus bar 31 and the rotor center. The axial distance from the line is set short.

  The inclined bus bar laminated body 18 is disposed at the inner peripheral position of the stator 3, and the rotor 2 gradually increases in rotor thickness toward the rotor shaft at an inner peripheral portion facing the inclined bus bar laminated body 18 in the axial direction. The taper reinforcing portion 2a is enlarged.

  The inclined bus bar laminated body 18 is disposed at the inner peripheral position of the stator 3, and the back surface of the case not facing the rotor 2 of the bus bar case 30 is a first tapered surface 30 b along the stepwise arrangement of the plurality of bus bars 31. A refrigerant gallery 20 (first refrigerant path) is formed in the stator case 13 that houses the stator core 14 and the stator coil 16 so as to extend in the axial direction to a position close to the back surface of the bus bar case 30.

  The inclined bus bar laminated body 18 is arranged at the inner peripheral position of the stator 3, and the front surface of the case facing the rotor 2 of the bus bar case 30 follows the stepped arrangement of the plurality of bus bars 31 by the resin mold portion 21. A first radial oil passage 8 (first taper surface 21a) that injects refrigerant in a radial direction toward the rotor shaft 1 supporting the rotor 2 between the rotor surface and the second taper surface 21a. 2 refrigerant paths) are formed.

Next, the operation will be described.
For example, as shown in FIG. 4 (a), a conventional bus bar laminated body has a plurality of bus bars that are concentric with respect to an axial bus bar groove formed in a bus bar case made of an insulating material in the axial direction at the same radial position. As shown in FIG. 4 (b), the creepage distance due to the insulating material between the two adjacent bus bars is short, and high insulation performance is not ensured and a high voltage is applied to the bus bar. In this case, leakage loss occurs between the two bus bars along the short insulating surface. That is, the creepage distance is (2a + b) where the pull-in amount between the bus bar and the bus bar groove is a and the bus bar case thickness is b.

On the other hand, in the coil connection structure of the first embodiment, a plurality of bus bars 31 provided concentrically and radially stacked on the axial bus bar groove 30a formed in the bus bar case 30 made of an insulating material, respectively. As shown in FIG. 3 (b), compared to a conventional bus bar laminate in which a plurality of bus bars are arranged on the same axis, because the inclined bus bar laminate 18 is arranged stepwise by shifting in the axial direction. The creeping distance due to the insulating material between the two adjacent bus bars 31, 31 is a long distance. That is, when the pulling amount between the inner peripheral surface of the bus bar 31 and the bus bar groove 30a is a, the bus bar case thickness is b, and the pulling amount between the outer peripheral surface of the bus bar 31 and the bus bar groove 30a is c, the creeping distance is (a + b + c). Since c> a, (a + b + c)> (2a + b).
Therefore, the creeping distance due to the insulating material between the two adjacent bus bars 31 and 31 becomes a long distance, so that the insulation performance between the bus bars 31 and 31 can be improved.

  As shown in FIG. 3A, the inclined bus bar laminated body 18 according to the first embodiment has an axial interval between the bus bar 31 on the inner peripheral side and the rotor center line among the plurality of bus bars 31 arranged in a step shape. Is set longer, and the axial interval between the outer peripheral side bus bar 31 and the rotor center line is set shorter. For this reason, as described below, while ensuring the compactness, the rigidity of the rotor 2 can be increased, and the cooling performance can be improved.

  That is, in the rotor 2, the inner peripheral portion facing the inclined bus bar laminated body 18 disposed in the inner peripheral position of the stator 3 in the axial direction is a taper reinforcing portion 2a in which the rotor thickness gradually increases toward the rotor shaft. Therefore, the rigidity of the rotor can be improved while utilizing the axial marginal space obtained by using the inclined bus bar laminate 18.

  Further, the inclined bus bar laminated body 18 is disposed at the inner peripheral position of the stator 3, and the back surface of the case not facing the rotor 2 of the bus bar case 30 is defined as a first tapered surface 30 b along the stepwise arrangement of the plurality of bus bars 31. Since the refrigerant gallery 20 extending in the axial direction is formed in the stator case 13 so as to be close to the rear surface of the bus bar case 30, the axial margin space obtained by forming the inclined bus bar laminate 18 is used. However, the cooling performance can be improved by extending the refrigerant gallery 20 in the axial direction to a position close to the back surface of the bus bar case 30.

  In addition, the inclined bus bar laminated body 18 is arranged at the inner peripheral position of the stator 3, and the front surface of the case facing the rotor 2 of the bus bar case 30 is arranged along the stepped arrangement of the plurality of bus bars 31 by the resin mold portion 21. The first taper surface 21a is formed on the rotor shaft 1 that supports the rotor 2, and the first radial oil passage 8 that injects the refrigerant in the radial direction is formed between the rotor surface and the second taper surface 21a. Therefore, as shown by the arrow in FIG. 3A, the cooled oil is ejected from between the taper reinforcing portion 2a and the second taper surface 21a, and from between the permanent magnet 12 and the stator core 14 toward the outer periphery. Can be supplied. For this reason, it is possible to further improve the cooling performance of the stator 3 in combination with the cooling performance by the refrigerant gallery 20 while oil-lubricating the air gap.

Next, the effect will be described.
In the coil connection structure of the axial gap type rotating electrical machine of the first embodiment, the effects listed below can be obtained.

  (1) Axial in which the rotor 2 having the permanent magnets 12 and 12 disposed thereon and the stators 3 and 3 having the stator core 14 and the stator coil 16 are disposed, and the rotor 2 and the stators 3 and 3 are disposed in the axial direction. In the gap-type rotating electrical machine, the stator coil 16 is connected to a plurality of bus bars 31 provided concentrically and radially stacked on an axial bus bar groove 30a formed in the bus bar case 30 made of an insulating material. Since the inclined bus bar laminated body 18 in which the plurality of bus bars 31 are shifted in the axial direction and arranged stepwise is provided, the bus bar laminated body is applied as a connection structure to the stator coil 16, and the adjacent bus bars 31, 31 are connected. The insulation performance can be improved.

  (2) The inclined bus bar laminated body 18 has a long axial distance between the inner peripheral side bus bar 31 and the rotor center line among the plurality of bus bars 31 arranged in a staircase shape. Since the axial distance from the rotor center line is set short, the marginal space formed in the axial direction can be effectively used for improving the rigidity of the rotor and the cooling performance while maintaining the compactness as it is.

  (3) The inclined bus bar laminated body 18 is disposed at the inner peripheral position of the stator 3, and the rotor 2 has an inner peripheral portion facing the inclined bus bar laminated body 18 in the axial direction with a rotor thickness toward the rotor axis. Therefore, the rigidity of the rotor can be improved while utilizing the marginal space in the axial direction obtained by using the inclined bus bar laminated body 18.

  (4) The inclined bus bar laminated body 18 is arranged at the inner peripheral position of the stator 3, and the back of the case that does not face the rotor 2 of the bus bar case 30 is a first along the stepped arrangement of the plurality of bus bars 31. Since the refrigerant gallery 20 is formed on the stator case 13 that has a tapered surface 30b and extends in the axial direction to a position close to the back surface of the bus bar case 30 in the stator case 13 that houses the stator core 14 and the stator coil 16, the inclined bus bar laminate 18 is formed. The cooling performance of the stator 3 can be improved while utilizing the axial margin space obtained in this way.

  (5) The inclined bus bar laminated body 18 is disposed at the inner peripheral position of the stator 3, and the front surface of the case facing the rotor 2 of the bus bar case 30 is disposed in a stepped manner by the resin mold portion 21. A first tapered oil passage that injects refrigerant in a radial direction toward the rotor shaft 1 that supports the rotor 2 between the rotor surface and the second tapered surface 21a. 8 is formed, the cooling performance of the stator 3 can be improved while oil-lubricating the air gap.

  Example 2 is an example in which the inclination direction of the inclined bus bar laminate is opposite to the inclination direction of Example 1.

  That is, the coil connection structure of the axial gap type rotating electrical machine according to the second embodiment has an inner peripheral side bus bar 31 and a rotor center line among the plurality of bus bars 31 arranged in a step shape as shown in FIG. The inclined bus bar laminated body 18 is set so that the axial interval is set short and the axial interval between the outer peripheral bus bar 31 and the rotor center line is set long, and the radial coil portion connected to the stator coil 16 is located close to the rotor shaft 1. And is connected to the bus bar 31 at the innermost peripheral position and the radial coil portion. Except for the configuration that ensures the rotor rigidity and the configuration that secures the cooling performance, the other configurations are the same as those in the first embodiment, so the corresponding components are denoted by the same reference numerals and the description thereof is omitted.

  Next, the operation will be described. In the inclined bus bar laminated body 18 of the second embodiment, among the plurality of bus bars 31 arranged in a staircase shape, the axial interval between the bus bar 31 on the inner peripheral side and the rotor center line is shortened. The axial distance between the outer peripheral bus bar 31 and the rotor center line was set longer. The radial coil portion connected to the stator coil 16 is extended to a position close to the rotor shaft 1 by utilizing the axial margin space by the inclined bus bar laminated body 18, and the bus bar 31 at the innermost peripheral position and the radial coil portion are connected. . By this connection, the axial dimension between the radial coil portion and the inclined bus bar laminate 18 can be expanded as compared with the first embodiment, so that the insulation performance between the radial coil portion and the bus bar 31 of the other layer can be improved. The other operations are the same as those of the first embodiment except for the operation of ensuring the rotor rigidity and the operation of ensuring the cooling performance.

  Next, the effect will be described. In the coil connection structure of the axial gap type rotating electrical machine of the second embodiment, the following effect can be obtained in addition to the effect of (1) of the first embodiment.

  (6) The inclined bus bar laminated body 18 has a short axial distance between the inner peripheral side bus bar 31 and the rotor center line among the plurality of bus bars 31 arranged in a staircase shape. The axial distance from the rotor center line is set long, the radial coil portion connected to the stator coil 16 is extended to a position close to the rotor shaft 1, and the bus bar 31 and the radial coil portion at the innermost peripheral position are connected to each other. Insulating performance between the radial coil portion and the bus bar 31 of the other layer can be improved while ensuring the same.

  Example 3 is an example in which the insulation performance between the radial coil portion and the bus bar of the other layer is improved while the inclination direction of the inclined bus bar laminated body is the same direction as Example 1.

  That is, in the coil connection structure of the axial gap type rotating electrical machine of the third embodiment, as shown in FIG. 6, the radial coil portion connected to the stator coil 16 is extended to a position close to the rotor shaft 1 and the bus bar at the innermost peripheral position is provided. 31 is connected to the radial coil portion. Except for the configuration that ensures the rotor rigidity and the configuration that secures the cooling performance, the other configurations are the same as those in the first embodiment, so the corresponding components are denoted by the same reference numerals and the description thereof is omitted.

  Next, the operation will be described. In the inclined bus bar laminated body 18 of the third embodiment, among the plurality of bus bars 31 arranged stepwise, the axial interval between the inner peripheral side bus bar 31 and the rotor center line is increased. The axial interval between the outer peripheral bus bar 31 and the rotor center line was set short. The radial coil portion connected to the stator coil 16 is extended to a position close to the rotor shaft 1 by utilizing the axial margin space by the inclined bus bar laminated body 18, and the bus bar 31 at the innermost peripheral position and the radial coil portion are connected. . By this connection, the axial dimension between the radial coil portion and the inclined bus bar laminate 18 can be expanded as compared with the first embodiment, so that the insulation performance between the radial coil portion and the bus bar 31 of the other layer can be improved. The other operations are the same as those of the first embodiment except for the operation of ensuring the rotor rigidity and the operation of ensuring the cooling performance.

  Therefore, in the coil connection structure of the axial gap type rotating electrical machine of the third embodiment, in addition to the effects (1) and (2) of the first embodiment, the following effects can be obtained.

  (7) Since the radial coil portion connected to the stator coil 16 is extended to a position close to the rotor shaft 1 and is connected to the bus bar 31 and the radial coil portion at the innermost peripheral position, the radial coil portion The insulation performance between the bus bars 31 in the other layers can be improved.

Example 4 is an example in which securing of rotor rigidity and refrigerant injection are omitted in Example 1.
That is, in the coil connection structure of the axial gap type rotating electric machine according to the fourth embodiment, as shown in FIG. 7, the inclined bus bar laminated body 18 is formed on the inner peripheral side among the plurality of bus bars 31 arranged in a step shape. The axial interval between the bus bar 31 and the rotor center line is set long, and the axial interval between the outer peripheral bus bar 31 and the rotor center line is set short.
The inclined bus bar laminated body 18 is disposed at the inner peripheral position of the stator 3, and the back surface of the case not facing the rotor 2 of the bus bar case 30 is a first tapered surface 30 b along the stepwise arrangement of the plurality of bus bars 31. A refrigerant gallery 20 (first refrigerant path) is formed in the stator case 13 that houses the stator core 14 and the stator coil 16 so as to extend in the axial direction to a position close to the back surface of the bus bar case 30. Since other configurations are the same as those of the first embodiment, the corresponding components are denoted by the same reference numerals and description thereof is omitted. Further, the description of the operation is the same as that in the first embodiment except for the rotor rigidity ensuring operation and the refrigerant injection operation.
Therefore, in the coil connection structure of the axial gap type rotating electrical machine of the fourth embodiment, the effects (1), (2), (4) of the first embodiment can be obtained.

The fifth embodiment is an example in which only the refrigerant injection is omitted in the first embodiment.
That is, in the coil connection structure of the axial gap type rotating electric machine of Example 5, as shown in FIG. 8, the inclined bus bar laminated body 18 is formed on the inner peripheral side among the plurality of bus bars 31 arranged stepwise. The axial interval between the bus bar 31 and the rotor center line is set long, and the axial interval between the outer peripheral bus bar 31 and the rotor center line is set short.
The inclined bus bar laminated body 18 is disposed at the inner peripheral position of the stator 3, and the rotor 2 gradually increases in rotor thickness toward the rotor shaft at an inner peripheral portion facing the inclined bus bar laminated body 18 in the axial direction. The taper reinforcing portion 2a is enlarged.
The inclined bus bar laminated body 18 is disposed at the inner peripheral position of the stator 3, and the back surface of the case not facing the rotor 2 of the bus bar case 30 is a first tapered surface 30 b along the stepwise arrangement of the plurality of bus bars 31. A refrigerant gallery 20 (first refrigerant path) is formed in the stator case 13 that houses the stator core 14 and the stator coil 16 so as to extend in the axial direction to a position close to the back surface of the bus bar case 30. Since other configurations are the same as those of the first embodiment, the corresponding components are denoted by the same reference numerals and description thereof is omitted. Further, the description of the operation is the same as that in the first embodiment except for the rotor rigidity ensuring operation and the refrigerant injection operation.
Therefore, in the coil connection structure of the axial gap type rotating electrical machine of the fifth embodiment, the effects (1), (2), (3), (4) of the first embodiment can be obtained.

  As mentioned above, although the coil connection structure of the axial gap type rotary electric machine of the present invention has been described based on the first to fifth embodiments, the specific configuration is not limited to these embodiments, and Design changes and additions are permitted without departing from the spirit of the invention according to each claim of the scope.

  For example, in Examples 1-5, although the example which has an axial air gap between a rotor and a stator was shown as an axial gap type rotary electric machine, between a rotor and a stator, for example, an axial by an oil film is shown. The present invention can also be applied to an axial gap type rotating electrical machine in which an air gap is substantially absent only by the existence of a gap.

  In the first to fifth embodiments, an axial gap type rotating electric machine is described. However, it may be applied as an axial gap type motor or an axial gap type generator. In the first to fifth embodiments, an example of application to a 1 rotor / 2 stator type axial gap type rotating electrical machine has been shown. However, a 1 rotor / 1 stator type, 2 rotor / 1 stator type, 2 rotor / 2 stator type are shown. The present invention can also be applied to an axial gap type rotating electrical machine in which the number of stators and rotors is different from that of the embodiment.

It is a whole sectional view showing an axial gap type rotating electrical machine to which the coil connection structure of Example 1 is applied. It is a figure which shows the stator to which the coil connection structure of the axial gap type rotary electric machine of Example 1 was applied. It is principal part sectional drawing which shows the coil connection structure of the axial gap type rotary electric machine of Example 1. FIG. It is principal part sectional drawing which shows the coil connection structure of the axial gap type rotary electric machine of a prior art example. It is principal part sectional drawing which shows the coil connection structure of the axial gap type rotary electric machine of Example 2. FIG. It is principal part sectional drawing which shows the coil connection structure of the axial gap type rotary electric machine of Example 3. FIG. It is principal part sectional drawing which shows the coil connection structure of the axial gap type rotary electric machine of Example 4. FIG. It is principal part sectional drawing which shows the coil connection structure of the axial gap type rotary electric machine of Example 5. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotor shaft 2 Rotor 2a Taper reinforcement part 3 Stator 4 Rotating electrical machine case 5 1st bearing 6 2nd bearing 7 Axial center oil path 8 1st radial direction oil path (2nd refrigerant path)
9 Second radial oil passage 10 Third radial oil passage 11 Rotor plate 12 Permanent magnet 13 Stator case 14 Stator core 15 Insulator 16 Stator coil 17 Core base 18 Inclined busbar laminate 19 Power transmission terminal 20 Refrigerant gallery (first refrigerant passage) )
21 Resin mold part 21a 2nd taper surface 30 Bus bar case 30a Bus bar groove | channel 30b 1st taper surface 31 Bus bar

Claims (7)

In an axial gap type rotating electrical machine including a rotor having a permanent magnet, a stator having a stator core and a stator coil, and the rotor and the stator are disposed in an axial direction.
The stator coil is connected to a plurality of bus bars provided concentrically and radially stacked with respect to an axial bus bar groove formed in a bus bar case made of an insulating material,
A coil connection structure for an axial gap type rotating electrical machine, wherein an inclined bus bar laminated body in which the plurality of bus bars are shifted in the axial direction and arranged stepwise is provided. In the coil connection structure of the axial gap type rotating electrical machine according to claim 1,
The inclined bus bar laminate has a long axial distance between the inner peripheral side bus bar and the rotor central axis among the plurality of bus bars arranged in a step shape, and the outer peripheral side bus bar and the rotor central axis A coil connection structure for an axial gap type rotating electrical machine, characterized in that the direction interval is set short. In the coil connection structure of the axial gap type rotating electrical machine according to claim 2,
The inclined bus bar laminate is disposed at an inner peripheral position of the stator,
Coil connection of an axial gap type rotating electrical machine wherein the rotor has an inner peripheral portion facing the inclined bus bar laminated body in the axial direction as a taper reinforcing portion whose rotor thickness gradually increases toward the rotor shaft. Construction. In the coil connection structure of the axial gap type rotating electrical machine according to claim 2 or 3,
The inclined bus bar laminated body is disposed at an inner peripheral position of the stator, and a back surface of the case not facing the rotor of the bus bar case is a first tapered surface along a stepped arrangement of the plurality of bus bars,
A coil connection structure of an axial gap type rotating electrical machine, wherein a first refrigerant path extending in an axial direction is formed in a stator case that houses the stator core and the stator coil to a position close to the rear surface of the bus bar case. In the coil connection structure of the axial gap type rotating electrical machine according to any one of claims 2 to 4,
The inclined bus bar laminated body is disposed at the inner peripheral position of the stator, and the front surface of the case facing the rotor of the bus bar case is a second tapered surface along the stepped arrangement of the plurality of bus bars by the resin mold portion. ,
A coil connection of an axial gap type rotating electrical machine, wherein a second refrigerant path for injecting a refrigerant in a radial direction is formed between a rotor surface and the second taper surface on a rotor shaft that supports the rotor. Construction. In the coil connection structure of the axial gap type rotating electrical machine according to claim 1,
The inclined bus bar laminated body has a short axial interval between the bus bar on the inner peripheral side and the rotor central axis among the plurality of bus bars arranged in a stepped manner, and the axis between the bus bar on the outer peripheral side and the rotor central axis. Axial gap type rotating electrical machine coil, characterized in that a radial coil portion connected to the stator coil is extended to a position close to the rotor shaft and connected to the innermost bus bar and the radial coil portion with a long direction interval. Connection structure. In the coil connection structure of the axial gap type rotating electrical machine according to claim 2,
A coil connection structure for an axial gap type rotating electric machine, wherein a radial coil portion connected to the stator coil is extended to a position close to a rotor shaft and connected to a bus bar and a radial coil portion at an innermost peripheral position.

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