JP7208057B2 - Rotating electric machine and vehicle - Google Patents

Description

The present invention relates to rotating electric machines and vehicles.

In a rotating electric machine for high-voltage equipment, stator coils are housed in slots of a stator core, and electrical insulation between the coil and the core is generally provided by a coil insulation layer made of mica tape and resin. The reason why the coil insulation layer is configured as described above is to suppress partial discharge due to electrical charging and to ensure redundancy in insulation performance during thermal deterioration.

Distributed winding is generally adopted as a winding method for the purpose of reducing vibration, noise, and loss. Distributed winding makes it possible to make the spatial distribution of the rotating magnetic field produced by the stator closer to a sine wave, so that the above object can be achieved more easily than concentrated winding. In addition, a configuration called two-layer lap winding is employed for the purpose of regularly aligning axial ends (hereinafter referred to as coil ends) of the stator coil. In the two-layer lap winding, the coil is divided into two layers per slot, and the insulating layer is provided for each layer as described in Patent Document 1.

A coil is generally manufactured by winding a conductor a plurality of times in a racetrack shape and then forming the conductor. A mica tape is wound around the molded coil to form one coil layer. There are two methods of filling the resin that constitutes the insulating layer. One is the prepreg method, in which the resin is cured when the coil is molded and then stored in the slot. It is a total impregnation method that In either method, the coils are housed in the slots layer by layer from the inner circumference side of the stator core, resulting in a slot shape called an open slot. A wedge is inserted into the slot opening for the purpose of preventing the coil from falling off.

In the manufacturing method described above, since one layer of the coil is formed by stacking a plurality of conductors, the stacking height of the conductors increases, and the coils interfere with each other at the coil end portions. In order to avoid this, it is necessary to provide a configuration in which the bent portion of the coil extending between the slots is relieved in the axial direction of the coil end. However, this configuration increases the size of the rotating electrical machine in the axial direction, which causes a problem of increasing the size, weight, and cost of the rotating electrical machine. In addition, due to the open slot shape, harmonic components called slot harmonics are superimposed on the spatial distribution of the rotating magnetic field, making it difficult to further reduce vibration, noise, and loss.

As a conventional technique for solving this problem, there is a method of forming a "fitting structure" in a stator slot and joining a "coil conductor" in the slot as described in Patent Document 2.

JP 2017-163727 A JP 2015-023771 A

However, the technique described in Patent Document 2 cannot resolve the trade-off between fitting workability and long-term reliability. Specifically, when considering the work of fitting all the stator coil conductors, it is desirable to increase the clearance of the fitting portion to facilitate fitting, but this makes it easier for the fitting portion to come off after assembly. , the reliability of the motor cannot be ensured due to the large variation in contact resistance. On the other hand, if the clearance of the mating part is made small, there are cases where the fitting becomes difficult and electrical continuity cannot be ensured. In any case, it becomes difficult to ensure reliability. Moreover, even if it were possible to achieve tolerance control that would make it easy to fit and difficult to remove, the cost of production control required for this would be enormous, leading to a rise in product prices. Furthermore, there is a problem that the resin enters the clearance of the fitting portion in the process of impregnating the resin, making it impossible to ensure electrical continuity.

SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide a compact, lightweight, low-cost, highly reliable rotary electric machine and a vehicle.

In order to achieve the above object, a rotating electrical machine of the present invention includes a stator wound with a plurality of coils, and a rotor freely rotatable with a predetermined gap from the stator. In a rotating electric machine, a slot provided inside the stator to accommodate a part of the coil, an insulating layer provided on an inner wall of the slot, and a heater provided between the insulating layer and the coil and an inflatable sheet, the coil having a first conductor and a second conductor, the first conductor and the second conductor each having at least two conductors at longitudinal ends. It is a thing that is combined to have an L-shaped step by shifting the parts,
The first conductor and the second conductor are connected so as to fill the L-shaped step of the first conductor and the L-shaped step of the second conductor, and the heat expandable sheet and the connection portion between the first conductor and the second conductor is coated with conductive plating,
By heating the coil, the heat-expandable sheet is expanded, and pressure is generated in a direction in which the conductive plated portions coated on the first conductor and the second conductor are brought into contact with each other. The first conductor and the second conductor are electrically connected .

More specific configurations of the invention are described in the claims.

According to the present invention, it is possible to provide a rotating electric machine and a vehicle that are compact, lightweight, low-cost, and highly reliable. Problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.

Half sectional view of the rotary electric machine of the first embodiment Cross-sectional view of the coil of Example 1 Schematic diagram for explaining the method of connecting the coil conductors of the first embodiment. Schematic diagrams for explaining a method of assembling the coil of Example 1. Schematic diagram showing the assembled state of the coil of Example 1 Schematic diagram enlarging the coil of FIG. 5A FIG. 4 is a side view comparing coil end lengths of the coil of Example 1 and a conventional coil; Schematic diagram for explaining a method of connecting coil conductors constituting the rotating electric machine of the second embodiment. Schematic diagram of the vehicle of Example 3 Cross-sectional view of a coil that constitutes a conventional rotary electric machine Schematic diagram showing the assembly state of a conventional coil The figure which took out the coil of FIG. 10A Schematic diagram showing an example of one coil Schematic diagram showing another example of one coil

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same symbols are attached to the same components. Their names and functions are the same, and duplicate explanations are avoided.

In the present invention, the term "coil" is defined as "one turn of tortoiseshell winding" or "one cycle of wave winding". Therefore, for example, a configuration in which a coil is wound four times is expressed as a four-turn coil. FIG. 11A is a schematic diagram showing an example of one coil, and FIG. 11B is a schematic diagram showing another example of one coil. 11A or 11B is used as the definition of "a configuration having a connection part inside the coil or the stator core". In addition, when one coil is composed of a plurality of conductors, the plurality of conductors are collectively referred to as a "coil conductor" unless otherwise specified.

Moreover, in the tortoiseshell winding, two-layer winding is assumed, and the coil per layer is expressed as "one coil layer". On the other hand, in wave winding, since one layer is composed of two coils, this is expressed as "one coil layer". Therefore, for example, when a coil conductor of eight turns is stored in one slot, the coil conductor of four turns corresponds to one coil layer in the tortoise shell winding, and one slot is composed of two coil layers. In wave winding, two coil conductors form one coil layer, and one slot is composed of four coil layers.

In the following description, high-voltage electric motors for general industry, railroads, construction machinery, automobiles, etc., and rotary electric machines typified by high-voltage generators such as wind power generators are targeted, but the effects of the present invention are not limited to these. It is not limited to , and can be applied to rotating electric machines in general.

The rotating machine may be an induction machine, a permanent magnet synchronous machine, a wound synchronous machine, a synchronous reluctance rotating machine and a self-starting synchronous machine. Further, although the following description deals with an internal rotation type rotating electrical machine, it may be an external rotation type rotating electrical machine. The material of the coil conductor may be copper, aluminum, or other conductive material.

A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a half cross-sectional view of the rotary electric machine of Example 1. FIG. Embodiment 1 FIG. 1 is a cross-sectional view along the axial direction of a rotating electrical machine 1 according to a first embodiment of the present invention, showing half of the rotating electrical machine 1 in the radial direction. As shown in FIG. 1, the rotary electric machine 1 includes a stator 2, a rotor 3, and a frame (a housing 11, a cover 21, and an end bracket 9) installed outside the stator 2 and the rotor 3. Prepare.

The stator 2 includes a stator core 4 and multiphase stator windings (stator coils) 5 wound around the stator core 4 . The stator core 4 includes, although not shown, a plurality of tooth cores projecting radially from an annular yoke core.

The rotor 3 includes a rotor core 7, a retainer plate 15, a shaft 8, and bearings 10 provided at both ends in the axial direction. be provided. A gap is provided between the rotor 3 and the stator 2 . The rotor core 7 has a plurality of rotor slots 6 containing rotor conductor rods 13 made of conductors. Rotor conductor rods 13 are connected to end rings 14 at both axial ends of rotor 3 . The retainer plate 15 axially presses and fixes the rotor core 7 at both ends in the axial direction. The shaft 8 is a rotating shaft of the rotary electric machine 1 and is rotatably supported by bearings 10 .

A grease pocket 23 is provided around the bearing 10 . The grease pocket 23 is a lubricant holding portion, and is filled with grease, which is a lubricant to be supplied to the bearing 10. The grease pocket 23 has a structure capable of supplying the grease to the bearing 10 (for example, grease warmed by heat flows to the bearing 10). 10). In this embodiment, the grease pocket 23 is provided on one side of the bearing 10 in the axial direction (inside the machine).

The frame comprises housing 11 , cover 21 and end brackets 9 . The housing 11 holds the stator core 4 on its inner peripheral surface. The cover 21 is fixed to one axial end of the housing 11 and supports the bearing 10 at the one axial end. The end bracket 9 is fixed to the other axial end of the housing 11 and supports the bearing 10 at the other axial end.

The rotating electric machine 1 includes a fan 20 that generates cooling air for cooling the bearing 10 on the outer side of the bearing 10 in the axial direction. Although not shown, the frame has ventilation holes through which the cooling air generated by the fan 20 passes.

Next, the stator coil 5 will be explained. 5A is a schematic diagram showing an assembled state of the coil of Example 1, and FIG. 5B is an enlarged schematic diagram of the coil of FIG. 5A. A portion of coil 201 is housed inside slot 102 of stator 100, as shown in FIGS. 5A and 5B. Teeth 103 are arranged between the slots.

Here, before describing this embodiment in detail, the overall configuration and problems of the conventional stator coil will be described with reference to FIGS. 9, 10A and 10B. FIG. 9 is a cross-sectional view of a coil that constitutes a conventional rotating electric machine, FIG. 10A is an explanatory diagram showing an assembled state of the conventional coil, and FIG. 10B is a view of the coil of FIG. 10A taken out.

In FIG. 10A, stator 500 has a plurality of slots 502 in the circumferential direction and has an open slot shape. Inside each slot 502, two coils 600 for one layer are stored in each slot, and has a structure of distributed winding and two-layer lap winding using a tortoise shell coil. Inside the stator 500, although not shown, an internal rotor is disposed through a gap so as to be freely rotatable in the circumferential direction.

As shown in FIG. 10A, coil ends are regularly aligned in two-layer lap winding. A general method for manufacturing one layer of a coil is to form the conductor as shown in FIG. 10B after winding the conductor a plurality of times in a racetrack shape. In this method, since one layer of the coil is formed by stacking a plurality of conductors, the stacking height of the conductors increases and the coils interfere with each other at the coil end portions. In order to avoid this, it is necessary to provide a configuration in which the bent portion of the coil extending between the slots is relieved in the axial direction of the coil end, as indicated by "E" in FIGS. 10A and 10B. However, this configuration increases the size of the rotating electrical machine in the axial direction, which causes a problem of increasing the size, weight, and cost of the rotating electrical machine.

FIG. 9 is a sectional view of a coil that constitutes a conventional rotary electric machine. Here, eight coil conductors 601, 611, 621, 631, 641, 651, 661, 671 are inserted in one slot. A coil conductor of one turn is composed of two stages of flat rectangular wires for the purpose of reducing AC copper loss.

In order to ensure insulation between conductors 601a and 601b, each conductor is coated with an insulating film such as epoxy resin. Coil conductors 601, 611, 621, and 631 constitute one layer of the tortoise shell coil and are arranged as a bottom coil 600a. Similarly, coil conductors 641, 651, 661, and 671 constitute one layer of the tortoise shell winding coil and are arranged as an upper coil 600b.

Insulating layers 506a and 506b made of mica or the like are wound around one coil layer, respectively. A wedge 505 is inserted into the slot opening 502a for the purpose of preventing the coil from falling off. Furthermore, the insulating resin 507 is filled by a prepreg method or a full impregnation method. In this configuration, since the slot opening 502a has an open slot shape, harmonic components called slot harmonics are superimposed on the spatial distribution of the rotating magnetic field, making it difficult to reduce vibration, noise, and loss. Moreover, since the operation|work which inserts the wedge 505 is required, there exists a subject which invites an increase in manufacturing cost.

As a different form of the prior art, there is a method of forming a fitting structure in the stator slot and joining the coil conductors at that part, but there is a drawback that the trade-off between fitting workability and long-term reliability cannot be resolved. there were. The present invention solves these problems, and the specific means and principle for solving the problems will be described with reference to FIGS. 2 and 3. FIG.

FIG. 2 is a cross-sectional view of the coil of Example 1. FIG. 2, the main difference from the prior art is that the coil conductors 201, 211, 221, 231, 241, 251, 261, and 271 are each split at the center in the axial direction, and the paired coil conductors 202 are arranged on the depth side in the axial direction. , 212, 222, 232, 242, 252, 262, 272; each coil conductor is covered with a heat-expandable sheet 401, 411, 421, 431, 441, 451, 461, 471; One is that the part is configured in a semi-closed slot shape instead of an open slot shape, and the one-turn coil conductor is configured in wave winding instead of tortoiseshell winding.

FIG. 3 is a schematic diagram illustrating a method of connecting coil conductors according to the first embodiment. FIG. 3 focuses on the configuration inside the slot, taking the one-turn coil conductor 201 shown in FIG. 2 as an example, and FIG. 3B and FIG. 2 show the same state. As shown in FIG. 3A, one-turn coil conductors 201 and 202 are vertically divided at the center in the axial direction. That is, the coil conductor is composed of a first conductor 201 and a second conductor 202 . At least two conductors of the first conductor 201 and the second conductor 202 are combined so as to form a step (L-shaped step) by shifting the ends in the longitudinal direction. In FIG. 3A, the conductors in the upper half (first conductor) are conductors 201a and 201b, and the conductors in the lower half (second layer) are conductors 202a and 202b.

As shown in FIG. 3, the first conductors 201 and the second conductors 202 are connected so as to fill the respective steps, and are housed inside the heat expandable sheet 401 . The conductor 202 is covered with a heat-expandable sheet 401. The conductor 202 and the heat-expandable sheet 401 are combined and set in the stator slot, and the conductor 201 is inserted from above. The insulating layers 106a, 106b have an annular structure surrounding the slotted portion of the coil. A mica tape can be used as the insulating layers 106a and 106b. Conventionally, the mica tape is generally used by wrapping it around the surface of the coil, but in this embodiment, a plurality of coils are surrounded by box-shaped insulating layers 106a and 106b prepared in advance. This configuration eliminates the work of winding the mica tape, so that the manufacturing process can be reduced.

The connecting portion between the conductor 201 and the conductor 202 is surface-treated with a conductive member (for example, conductive plating), and as shown in FIG. It faces the conductive plated portion 301b of the conductor 201b and faces the conductive plated portion 302a of the conductor 202a. In addition, conductive plated portion 302a of conductor 202a also faces conductive plated portion 302b of conductor 202b. Surface treatment may be performed using nanoparticle bonding, conductive paste, or the like instead of conductive plating.

When the stator coil is heated in this state, the heat-expandable sheet 401 expands, so that the conductive plated portions of the conductors 201a and 201b are brought into contact with each other as shown in FIG. 3(c). is generated, and similarly, the conductive plated portions of the conductor 201a and the conductor 202a, and the conductive plated portions of the conductor 202a and the conductor 202b are brought into close contact with each other. As a result, a state is formed in which the respective conductive plated portions are in surface contact in the radial direction, and the electrical continuity of the conductors 201a, 201b, 202a, and 202b, which were originally separated, is ensured.

When assembling the stator coil, the same effect as described above can be obtained in all the slots by collectively heating the coil conductors after inserting them into all the slots. Furthermore, as a subsequent step, the insulating resin 107 is filled by a full impregnation method, so that the redundancy of the insulation performance at the time of thermal deterioration is also ensured.

With this method, when the coil conductor is inserted into the stator slot, before the heatable expansion sheet expands, a sufficient fitting clearance can be secured, and the insertion and connection of the coil can be performed very easily. can be implemented in In addition, since the connection portion of the coil conductor is simply combined by shifting the ends of the two coil conductors, it is much simpler than the case where the end of one coil conductor is provided with a fitting structure by machining or the like. A mating structure can be made in the process. Since it is only necessary to apply conductive plating to the connecting portion, there is no need for highly accurate tolerance control, and the manufacturing cost can be greatly reduced. In addition, there is no need for post-processing such as bending or welding after inserting the coil, and since there is no need to apply force in the fitting direction, deformation of the coil will not occur, and product reliability can be greatly improved. .

In addition, due to the expansion pressure of the heat-expandable sheet, the coil conductors facing each other inside the slot are pressed against each other, and the surface contact of the connecting part is stably maintained. The connection will not come off even if the connection is made, ensuring high reliability. Furthermore, since the slot opening 102a has a semi-closed slot shape, it is possible to reduce the slot harmonic component and further reduce vibration, noise, and loss.

In the illustrated embodiment, the coil conductors 201, 202, etc. are covered with the thermally expandable sheet 401, but the thermally expandable sheet 401 is placed at a position where the conductive plated portions of the coil conductors are pressed against each other. is provided, and the heat-expandable sheet 401 does not have to cover the entire circumference of the coils 201 and 202 .

A heat-expandable sheet is made by mixing an expanding filler containing liquefied carbon dioxide gas or the like into a resin (e.g., epoxy resin) that exhibits adhesiveness when heated as the base material of the sheet. or a sheet of urethane foam can be used. The form of the sheet is not limited to the forms shown in FIGS. 2 and 3 as long as it is configured to apply an expansion pressure to each coil winding. may be set. Alternatively, the insulating layers 106a and 106b shown in FIG. 2 may be combined.

FIG. 4 is a schematic diagram for explaining the method of assembling the coil of Example 1 of the present invention. As shown in FIG. 4(a), insulating layers 106a and 106b are provided in advance, and heat-expandable sheets 401, 402, . . . , 441, 451, . The sex sheet is constructed integrally. After inserting this into the slot 102, the coil conductor 201 may be inserted from above, and similarly the coil conductor 202 (not shown in FIG. 4) may be inserted from below.

FIG. 4(b) shows the state after the insulating layers 106a and 106b are attached to the core 101. FIG. It is desirable that the insulating layers 106 a and 106 b protrude axially outward from the axial end faces of the slot 102 . This is because the axial end face of the slot 102 may become an edge and damage the insulating coating of the coil. In other words, the insulating layers 106a, 106b can be utilized for edge protection. In addition, if dust or moisture enters the plated portions 301a and 301b, which are the connection portions of the conductors in the slot shown in FIG. is preferably sealed so as to fill the gap between the conductor 201 and the slot 102 and the gap between the conductor 201 and the heat-expandable sheet. With such a configuration, long-term reliability can be further improved.

Furthermore, long-term reliability can be improved by winding a protective tape 108 around the coil end portion of the coil conductor 201 . Moreover, the protective tape 108 can prevent damage to the coil insulating film due to the axial end face edge of the slot 102 described above. The material of the protective tape 108 may be the same as the material of the insulating layer 106, or may be another material.

Moreover, it is desirable that the thickness of the protective tape 108 is smaller than the thickness of the heat-expandable sheet 401 after heating. With such a configuration, a clearance is generated between the insulating layer 106 and the protective tape 108 after the heat-expandable sheet 401 is heated. 107 is filled to fill this clearance. As a result, it is possible to prevent foreign matter from entering the connection portion 301 of the coil conductor described above, so that long-term reliability can be improved. In addition, since the coil conductor 201 is coated with an insulating film such as epoxy resin, the protective tape 108 is not necessarily required when adopting the configuration of FIG. 4B.

The conductive plating part is simply a process of peeling off the insulating film of the conductor and plating it, but if it is possible to secure the electrical continuity of the connection part and the electrical insulation of the other parts, it is limited to this process. not something. Further, by setting the film thickness of the conductive plated portion to be larger than the insulating film thickness, the conductive surface can be made to protrude slightly from the side surface of the conductor, and the conductive surface can be reliably brought into surface contact. It should be noted that the metal forming the coil may be processed to slightly protrude from the side surface of the conductor on the conducting surface (for example, pressurized perpendicularly to the projecting direction).

As for the shape of the step at the connecting portion of the conductor 201 and the conductor 202, as shown in FIG. You can process it.

By adopting the procedure as described above, the coil storage work can be simplified as compared with the conventional technique. Moreover, in the stage prior to the connection work, the insertion work can be simplified by fixing the conductor 201a and the conductor 201b at least at one location using an adhesive to form an integral structure. In addition, since the insulating layer in the stator slot can be constructed in the same manner as in the prior art, high reliability can be ensured. In addition, since it can be formed into a semi-closed slot shape, it is possible to reduce slot harmonic components and further reduce vibration, noise, and loss.

Furthermore, by adopting the configuration of the present invention, it is not necessary to provide a configuration in which the coil ends are relieved in the axial direction as shown by "E" in FIGS. 10A and 10B. E" can be shortened in the axial direction. FIG. 6 is a side view comparing the coil end lengths of the coil of Example 1 and a conventional coil. With the configuration of the first embodiment described above, as shown in FIG. 6, the coil end length L2 of the present invention is significantly reduced compared to the coil end length L1 of the prior art. Weight reduction and cost reduction are possible. The principle that the present invention can provide a compact, lightweight, low-cost, and highly reliable electric rotating machine has been described above.

FIG. 7 is a schematic diagram illustrating a method of connecting coil conductors forming the rotating electric machine of the second embodiment. Embodiment 2 of the present invention will be described with reference to FIG. A different point from the first embodiment is that one winding of the coil conductors 201 and 202 is vertically divided at the center in the axial direction, the upper half is composed of three flat conductors 201a, 201b, and a conductor 201c, and the lower half is similarly flat. It is composed of three conductors 202a, 202b and 202c.

The conductor 201 is formed by shifting the end faces of the conductor 201b, the conductors 201a and 201c, and the conductor 202 is formed by shifting the end faces of the conductor 202b, the conductors 202a and 202c. In this way, the coil conductor may be configured by combining three or more conductors. With such a configuration, one coil can be configured with a flatter conductor, so that AC copper loss can be further reduced, and a highly efficient rotating electric machine can be obtained.

FIG. 8 is a schematic diagram of a vehicle according to Embodiment 3 of the present invention. FIG. 8 is a configuration diagram of a rotary machine drive system using the rotary electric machine of the present invention in a railway vehicle. The drive device of the railway vehicle 71 is supplied with electric power from the overhead wire 72 via the current collector, and AC power is supplied to the rotating electrical machine 76 via the power conversion device 75 to drive the rotating electrical machine 76 . The rotating electrical machine 76 is connected to an axle 74 of the railroad vehicle 71, and the running of the railroad vehicle is controlled by the rotating electrical machine 76. Electrical ground is connected via rail 73 . Here, the voltage of the overhead line 72 may be either direct current or alternating current.

According to this embodiment, by mounting the rotary electric machine of the present invention on the railway vehicle 71, it becomes possible to operate the rotary machine drive system of the railway vehicle 71 with high efficiency. Similar effects can also be obtained in vehicles such as automobiles and construction machines.

A rotary machine drive system provided in vehicles such as railways, automobiles, and construction machines has a 1C1M configuration driven by combining one inverter device and one rotary electric machine 76 . Alternatively, a rotating machine drive system provided in vehicles such as railways, automobiles, and construction machines has a configuration of 1CiM (i = 2, 3, 4, ...) driven by a combination of one inverter device and at least two rotating electric machines 76. be. A rotary machine drive system provided in vehicles such as railways, automobiles, and construction machines is composed of a combination of at least two or more groups of inverter devices and the rotary electric machine 76 .

As described above, according to the present invention, it has been demonstrated that a compact, lightweight, low-cost, and highly reliable rotating electric machine can be provided.

It should be noted that the present invention is not limited to the above-described embodiments, and other forms conceivable within the scope of the technical concept of the present invention are also included within the scope of the present invention as long as they do not deviate from the gist of the present invention. be For example, the configurations and processes exemplified in the above embodiments may be appropriately integrated or separated depending on the implementation form and processing efficiency. Also, for example, the embodiments and modifications described above may be combined in whole or in part within a non-contradictory range.

DESCRIPTION OF SYMBOLS 1, 50, 76... rotary electric machine, 2... stator, 3... rotor, 4... stator core, 5... stator winding, 6... rotor slot, 7... rotor core, 8... shaft, 9... End bracket 10 Bearing 11 Housing 12 Shield material 13 Rotor conductor bar 14 End ring 15 Retainer plate 20 Fan 21 Cover 23 Grease pocket 71 Railway car , 72... overhead wire, 73... rail, 74... axle, 75... power converter, 100, 500... stator, 101, 501... stator core, 102, 502... slot, 102a, 502a... slot opening, 103, 503... Teeth 104, 504... Gap 105, 505... Wedge 106a, 106b, 506a, 506b... Insulating layer 107, 507... Insulating resin 108... Protective tape 200, 600... One layer of stator coil, 200a, 600a... bottom coil, 200b, 600b... top coil, 201, 201a, 201b, 201c, 202a, 202b, 202c, 211a, 211b, 212a, 212b, 221a, 221b, 222a, 222b, 231a, 231b, 232a, 232b, 241a, 241b, 242a, 242b, 251a, 251b, 252a, 252b, 261a, 261b, 262a, 262b, 271a, 271b, 272a, 272b, 601a, 601b, 611a, 611b, 621a, 621b, 631a, 631b, 641a, 641b, 651a, 651b, 661a, 661b, 671a, 671b... coil conductor, 301a, 301b, 301c, 301d, 302a, 302b, 302c, 302d... conductive plating, 401, 402, 411, 421, 431, 441, 451 , 461, 471 . . . Heat-expandable sheet.

Claims (10)

A rotating electric machine comprising a stator wound with a plurality of coils and a rotor freely rotatable with a predetermined gap from the stator,
a slot that is provided inside the stator and accommodates a part of the coil;
an insulating layer provided on the inner wall of the slot;
a heat-expandable sheet provided between the insulating layer and the coil;
the coil has a first conductor and a second conductor;
each of the first conductor and the second conductor is a combination of at least two conductors with their ends shifted in the longitudinal direction to form an L-shaped step;
The first conductor and the second conductor are connected so as to fill the L-shaped step of the first conductor and the L-shaped step of the second conductor, and the heat expandable sheet and the connection portion between the first conductor and the second conductor is coated with conductive plating,
By heating the coil, the heat-expandable sheet is expanded, and pressure is generated in a direction in which the conductive plated portions coated on the first conductor and the second conductor are brought into contact with each other, so that they are in close contact with each other, A rotating electric machine , wherein the first conductor and the second conductor are electrically connected . In the rotary electric machine according to claim 1 ,
A rotary electric machine, wherein the insulating layer has a ring-shaped structure surrounding a portion of the coil that is housed in the slot. In the rotary electric machine according to claim 2 ,
A rotating electric machine, wherein the insulating layer is a mica tape. In the rotary electric machine according to claim 1 ,
A rotary electric machine, wherein a portion of the coil other than the connecting portion is covered with an insulating film. In the rotary electric machine according to claim 4 ,
The rotary electric machine, wherein the connecting portion protrudes from the portion covered with the insulating film. In the rotary electric machine according to claim 1 ,
The rotating electrical machine, wherein the insulating layer protrudes outward from an axial end surface of the slot. In the rotary electric machine according to claim 1 ,
A rotary electric machine, wherein the insulating layer protrudes outward from an axial end surface of the heat-expandable sheet. In the rotary electric machine according to claim 1 ,
A rotary electric machine, wherein a portion of the coil protruding outward from an axial end face of the slot is covered with a protective tape. In the rotary electric machine according to claim 8 ,
A rotary electric machine, wherein the thickness of the protective tape is smaller than the thickness of the heat-expandable sheet after heating. A vehicle comprising the rotating electric machine according to any one of claims 1 to 9 as a drive system.

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