JP2018133920A - Rotary electric machine, stator for the same, and method of manufacturing rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve improvement in efficiency of a rotary electric machine by taking measures against windage loss at a stator side.SOLUTION: Provided is a rotary electric machine 11 comprising: a stator 17 that has an annular ring-shaped stator core 15; and a rotor 19 provided at an inner diameter side of the stator 17 freely rotatably. The stator core 15 has a plurality of teeth 21 around each of which a coil 20 is wound. Each of the teeth 21 circumferentially adjacent to each other is arranged so as to have a gap 25 facing a slot 23 from the rotor 19 side between respective radial inside end parts 21a. At the gap 25, a resin body spacer 27 is provided so as to bury the gap 25.SELECTED DRAWING: Figure 2B

Description

  The present invention relates to a rotating electrical machine, a stator for the rotating electrical machine, and a method for manufacturing the rotating electrical machine.

  Recently, in addition to or in place of an internal combustion engine as a drive source, a vehicle equipped with a rotating electric machine has been widely used. Such vehicles are hybrid vehicles (Hybrid Electric Vehicles) and electric vehicles (Electric Vehicles).

  Patent Document 1 discloses an invention of a rotating electrical machine including a stator having an annular stator core and a rotor that is rotatably provided on the inner diameter side of the stator. The stator core has a plurality of teeth around which a coil is wound. Each of the teeth adjacent to each other in the circumferential direction is disposed with a gap that faces the slot from the rotor side between the respective radially inner ends.

  Patent Document 2 describes that the magnetic pole projections of the rotor are coupled with a bridge at the outer peripheral portion of the tip to make the outer peripheral portion a perfect circle. According to the technique of Patent Document 2, since the outer peripheral portion of the rotor is made into a perfect circle, windage loss is greatly reduced, and the efficiency of the rotating electrical machine can be improved.

JP 2014-107912 A (see FIG. 1) JP-A-5-22914

In the stator of the rotating electrical machine according to Patent Document 1, each of the teeth adjacent in the circumferential direction is disposed with a gap facing the slot from the rotor side between the respective radially inner end portions. Turbulent flow is generated in the vicinity of the gap during rotation, causing windage loss. As a result, there is a problem that the efficiency of the rotating electrical machine is impaired.
In this regard, Patent Document 2 discloses measures against windage loss on the rotor side, but does not disclose or suggest measures against windage loss on the stator side.

  The present invention has been made in view of the above circumstances, and provides a rotating electrical machine capable of improving the efficiency of a rotating electrical machine by taking measures against windage damage on the stator side, a stator of the rotating electrical machine, and a method of manufacturing the rotating electrical machine The purpose is to do.

  In order to achieve the above object, an invention according to claim 1 is a rotating electrical machine including a stator having an annular stator core and a rotor rotatably provided on an inner diameter side of the stator, wherein the stator core includes: Each of the teeth adjacent to each other in the circumferential direction has a plurality of teeth around which a coil is wound, and is disposed with a gap facing the slot from the rotor side between the respective radially inner ends. The main feature is that a resin spacer is provided in the gap so as to fill the gap.

  In the invention according to claim 1, each of the teeth adjacent to each other in the circumferential direction is provided with a gap that faces the slot from the rotor side between the respective radially inner ends, and the gap is provided with the gap. Since the resin body spacer is provided so as to be buried, it is possible to suppress the occurrence of turbulent flow near the gap during rotation of the rotor and to improve the efficiency of the rotating electrical machine.

  According to the present invention, it is possible to improve the efficiency of the rotating electrical machine by taking measures against windage damage on the stator side.

It is a front view of the rotary electric machine which concerns on embodiment of this invention. It is a principal part enlarged view which concerns on the comparative example of the rotary electric machine shown in FIG. It is a principal part enlarged view which concerns on the Example of the rotary electric machine shown in FIG. It is process drawing showing the procedure of the manufacturing method of the rotary electric machine which concerns on embodiment of this invention. It is a longitudinal cross-sectional view of the jig | tool used for the manufacturing method of the rotary electric machine which concerns on embodiment of this invention. It is a perspective view which represents notionally the mode of the resin injection | pouring process among the manufacturing methods of the rotary electric machine which concerns on embodiment of this invention. It is a longitudinal cross-sectional view showing the state which set the stator of the rotary electric machine which concerns on embodiment of this invention to the jig | tool. It is a longitudinal cross-sectional view showing the mode of the resin injection | pouring process among the manufacturing methods of the rotary electric machine which concerns on embodiment of this invention. It is a longitudinal cross-sectional view showing the stator of the rotary electric machine as a finished product.

[Outline of the rotating electrical machine 11 according to the embodiment of the present invention]
First, the outline | summary of the rotary electric machine 11 which concerns on embodiment of this invention is demonstrated with reference to drawings.
In addition, in drawing shown below, the same referential mark shall be attached | subjected between the same members or corresponding members. In addition, the size and shape of the member may be schematically represented by being deformed or exaggerated for convenience of explanation.
Furthermore, in the following description, “axial direction” refers to the direction along the rotational axis 19a (see FIG. 1) of the rotor 19, “circumferential direction” refers to the direction along the outer peripheral surface of the stator core 15 (see FIG. 1), and “diameter”. “Direction” means the radial direction of the stator core 15.

FIG. 1 is a front view of a rotating electrical machine 11 according to an embodiment of the present invention.
As shown in FIG. 1, a rotating electrical machine 11 according to an embodiment of the present invention includes a stator 17 having an annular stator core 15 and a rotor 19 that is rotatably provided on the inner diameter side of the stator 17. Yes. The stator core 15 is actually configured by laminating thin steel plates in the axial direction (see FIGS. 6A to 6C). The rotating electrical machine 11 is mounted on a vehicle and used as an electric motor or a generator, for example.

[The stator 17 of the rotating electrical machine 11 according to the embodiment of the present invention]
Next, the stator 17 of the rotating electrical machine 11 according to the embodiment of the present invention will be described with reference to FIGS. 2A and 2B.
2A is an enlarged view of a main part according to a comparative example of the rotating electrical machine 11 shown in FIG. FIG. 2B is an enlarged view of a main part according to the embodiment of the rotating electrical machine 11 shown in FIG.

  The stator 117 of the rotating electrical machine 111 according to the comparative example has an annular stator core 115 as shown in FIG. 2A. Stator core 115 has a plurality of teeth 121 around which coil 120 is wound. Each of the teeth 121 adjacent to each other in the circumferential direction is disposed between each of the radially inner ends 121a with a gap 125 that faces the slot 123 from the rotor 119 side.

  In the stator 117 of the rotating electrical machine 111 according to the comparative example, as shown in FIG. 2A, each of the teeth 121 adjacent in the circumferential direction is provided with a gap 125, so that the vicinity of the gap 125 is rotated when the rotor 119 rotates. A turbulent flow (see the arrow in FIG. 2A) occurs, causing windage loss. As a result, there is a problem that the efficiency of the rotating electrical machine 111 is impaired.

  On the other hand, in the stator 17 of the rotating electrical machine 11 according to the example (embodiment of the present invention), as shown in FIG. 2B, the stator core 15 has a plurality of teeth 21 around which the coils 20 are wound. Each of the teeth 21 adjacent to each other in the circumferential direction is disposed between each of the radially inner ends 21a with a gap 25 facing the slot 23 from the rotor 19 side. The configuration so far is the same as the stator 117 of the rotating electrical machine 111 according to Patent Document 1.

However, in the stator 17 of the rotating electrical machine 11 according to the embodiment of the present invention, the stator 25 of the rotating electrical machine 111 according to the comparative example is that the resin spacer 27 is provided in the gap 25 so as to fill the gap 25. 117 and different. Details of the resin body spacer 27 will be described later.
According to the rotating electrical machine 11 according to the embodiment of the present invention, it is possible to suppress a situation in which turbulent flow is generated in the vicinity of the gap 25 when the rotor 19 rotates and to improve the efficiency of the rotating electrical machine 11.

[Method of Manufacturing Rotary Electric Machine 11 According to Embodiment of the Present Invention]
Next, a method for manufacturing the rotating electrical machine 11 according to the embodiment of the present invention will be described with reference to FIG. 3 and FIGS. 4, 5, 6 </ b> A to 6 </ b> C, and 7.
FIG. 3 is a process diagram showing the procedure of the method for manufacturing the rotating electrical machine 11 according to the embodiment of the present invention. FIG. 4 is a longitudinal sectional view of a jig 31 used in the method for manufacturing the rotating electrical machine 11. FIG. 5 is a perspective view conceptually showing the state of the resin injection step in the method for manufacturing the rotating electrical machine 11. 6A is a longitudinal sectional view showing a state where the stator 17 of the rotating electrical machine 11 is set on the jig 31. FIG. FIG. 6B is a longitudinal cross-sectional view illustrating a resin injection process in the manufacturing method of the rotating electrical machine 11. FIG. 6C is a longitudinal sectional view showing the stator 17 of the rotating electrical machine 11 as a finished product.

  In the stator core manufacturing process of step S <b> 11 shown in FIG. 3, the stator core 15 is manufactured by winding the coil 20 around each of the plurality of teeth 21. Subsequently, the stator 17 is manufactured by setting the holder 16 with a flange (refer FIG. 6A) which covers the outer periphery of the stator core 15 to the stator core 15.

In step S12, the stator 17 manufactured in step S11 is set on the jig 31 shown in FIG.
Here, the jig 31 used in the manufacturing method of the rotating electrical machine 11 will be described with reference to FIG. As shown in FIG. 4, the jig 31 is formed in a bottomed cylindrical shape having a peripheral wall portion 33 and a bottom wall portion 35, and a column portion 37 is erected integrally at the center of the bottom wall portion 35. Has been.
The inner diameter dimension d1 of the peripheral wall portion 33 is formed to be slightly larger than the outer diameter dimension (excluding the flange) of the holder 16 (see FIGS. 6A to 6C). As a result, the holder 16 is accommodated snugly so as to face the peripheral wall 33 of the jig 31. A chamfering process is performed on the entire inner circumference of the peripheral wall portion 33 in order to make the setting operation of the holder 16 to the jig 31 smooth.
The height dimension h1 of the peripheral wall 33 is set to a dimension that is smaller by the thickness of the holder 16 than the axial dimension of the holder 16 (see FIG. 6A).
The outer diameter dimension d2 of the cylindrical portion 37 is set to be equal to the outer diameter dimension (tolerance upper limit value) of the rotor 19. Thereby, the air gap between the stator 17 and the rotor 19 in which the resin spacer 27 is formed over the surface of the inner diameter portion 17a (see FIG. 6A) is secured.
The misalignment amount d3 between the center line C1 of the cylindrical portion 37 and the center line C2 of the holder 16 is set so as to converge to a predetermined intersection range. Thereby, the layer thickness of the resin body spacer 27 formed in the inner diameter portion 17a of the stator 17 is made uniform in the circumferential direction.

In the resin injection step of step S13, as shown in FIGS. 5, 6A, and 6B, the circumference of the inner diameter portion 17a of the stator 17 manufactured in step S11 and the outer diameter portion 37a of the cylindrical portion 37 of the jig 31 is rotated. A resin having electrical insulating properties is injected under pressure through the injector nozzle 41 (see FIG. 6B) into the gap d4. A plurality of injector nozzles 41 are provided at equal intervals in an annular shape so as to face the circumferential gap d4.
Although it does not specifically limit as a raw material of resin, For example, resin which has thermosetting property can be employ | adopted suitably. The resin injection amount is an appropriate value (however possible, considering that the empty space excluding the occupied volume of the coil 20 in the slot 23 can be filled and the resin spacer 27 having a predetermined layer thickness can be formed). It is preferable that the amount is small.

  In the thermosetting process of step S14, as shown in FIG. 6B, the stator 17 set in the jig 31 after the resin injection process of step S13 is placed in the thermostat 43 at a predetermined temperature for a predetermined time. By placing, the resin injected in step S13 is cured.

  In step S15, the stator 17 after the thermosetting process of step S14 is removed from the jig 31. Thereby, as shown in FIG. 6C, a finished product of the stator 17 in which the layer of the resin spacer 27 is formed on the inner diameter portion 17a can be obtained.

[Effects of the rotating electrical machine 11, the stator 17 of the rotating electrical machine 11, and the manufacturing method of the rotating electrical machine 11 according to the embodiment of the present invention]
Next, the effect of the rotary electric machine 11, the stator 17 of the rotary electric machine 11, and the manufacturing method of the rotary electric machine 11 which concern on embodiment of this invention is demonstrated.
The invention based on the first aspect is a rotating electrical machine 11 that includes a stator 17 having an annular stator core 15 and a rotor 19 that is rotatably provided on the inner diameter side of the stator 17. Stator core 15 has a plurality of teeth 21 around which coil 20 is wound. Each of the teeth 21 adjacent to each other in the circumferential direction is disposed with a gap 25 facing the slot 23 from the rotor 19 side between the respective radial inner ends 21a. A resin body spacer 27 is provided in the gap 25 so as to fill the gap 25.

  According to the invention of the rotating electrical machine 11 based on the first aspect, it is possible to suppress the occurrence of turbulent flow in the vicinity of the gap 25 when the rotor 19 rotates and to improve the efficiency of the rotating electrical machine 11. Further, if the resin spacer 27 is filled so as to fill the empty volume portion excluding the occupied volume of the coil 20 in the slot 23, a secondary effect of dramatically increasing the electrical insulation of the coil 20 is expected. be able to.

  The invention based on the second aspect is the rotating electrical machine 11 based on the first aspect, and the resin body spacer 27 is substantially flush with the circumferential surface of the inner diameter portion 17a of the stator 17 in the circumferential direction of the stator 17. It is embed | buried in the clearance gap 25 so that it may become.

  According to the invention of the rotating electrical machine 11 based on the second aspect, the resin body spacer 27 is embedded in the gap 25 so that the circumferential surface of the inner diameter portion 17 a of the stator 17 is substantially flush with the circumferential direction of the stator 17. Therefore, compared with the invention of the rotating electrical machine 11 based on the first aspect, the situation in which turbulent flow is generated near the gap 25 when the rotor 19 rotates is further suppressed, and further efficiency improvement of the rotating electrical machine 11 is realized. Can do.

  The invention based on the third aspect is a stator 17 of a rotating electrical machine 11 having an annular stator core 15. Stator core 15 has a plurality of teeth 21 around which coil 20 is wound. Each of the teeth 21 adjacent to each other in the circumferential direction is disposed with a gap 25 facing the slot 23 from the rotor 19 side between the respective radial inner ends 21a. A resin body spacer 27 is provided in the gap 25 so as to fill the gap 25.

  According to the invention of the stator 17 of the rotating electrical machine 11 based on the third aspect, the stator 17 that can improve the efficiency of the rotating electrical machine 11 by suppressing a situation in which turbulent flow is generated near the gap 25 when the rotor 19 rotates. Can be obtained.

  The invention based on the fourth aspect is the stator 17 of the rotating electrical machine 11 based on the third aspect, and the resin body spacer 27 has a substantially circumferential surface of the inner diameter portion 17 a of the stator 17 across the circumferential direction of the stator 17. It is embedded in the gap 25 so as to be flush with each other.

  According to the invention of the stator 17 of the rotating electrical machine 11 based on the fourth aspect, the resin spacer 27 has a gap so that the circumferential surface of the inner diameter portion 17 a of the stator 17 is substantially flush with the circumferential direction of the stator 17. Since the rotor 17 is embedded, the rotating electrical machine 11 is further restrained from generating a turbulent flow in the vicinity of the gap 25 when the rotor 19 rotates, as compared with the invention of the stator 17 of the rotating electrical machine 11 based on the third aspect. Thus, it is possible to obtain the stator 17 capable of further improving the efficiency.

The invention based on the fifth aspect is a method of manufacturing a rotating electrical machine 11 that includes a stator 17 having an annular stator core 15 and a rotor 19 that is rotatably provided on the inner diameter side of the stator 17. Stator core 15 has a plurality of teeth 21 around which coil 20 is wound. Each of the teeth 21 adjacent to each other in the circumferential direction is disposed with a gap 25 facing the slot 23 from the rotor 19 side between the respective radial inner ends 21a. A resin body spacer 27 is provided in the gap 25 so as to fill the gap 25.
The invention of the manufacturing method of the rotating electrical machine 11 based on the fifth aspect has an outer diameter equal to or larger than the outer diameter of the rotor 19 and smaller than the inner diameter of the stator 17 on the inner diameter side of the stator 17. With the step of setting the jig 31 provided with the cylindrical portion 37 and the cylindrical portion 37 of the jig 31 set on the inner diameter side of the stator 17, the inner diameter portion 17a of the stator 17 and the outer diameter portion 37a of the cylindrical portion 37 are Forming a resin body spacer 27 by injecting resin into the circumferential gap d4.

  According to the invention of the manufacturing method of the rotating electrical machine 11 based on the fifth aspect, with the cylindrical portion 37 of the jig 31 set on the inner diameter side of the stator 17, the inner diameter portion 17 a of the stator 17 and the outer diameter of the cylindrical portion 37. Since the resin spacer 27 is formed by injecting resin into the circumferential gap d4 with the portion 37a, the work of providing the resin spacer 27 so as to fill the gap 25 facing the slot 23 from the rotor 19 side is simplified. Can be realized accurately with simple procedures.

[Other Embodiments]
The plurality of embodiments described above show examples of realization of the present invention. Therefore, the technical scope of the present invention should not be limitedly interpreted by these. This is because the present invention can be implemented in various forms without departing from the gist or main features thereof.

  For example, in the description of the invention according to the embodiment of the present invention, an example has been described in which a plurality of injector nozzles 41 are provided at equal intervals in an annular shape so as to face the circumferential gap d4. The invention is not limited to this example. You may employ | adopt the aspect which provides an annular | circular shaped injector nozzle so that the said circumferential space | gap d4 may be faced.

  Further, in the description of the invention according to the embodiment of the present invention, in the stator 17 having the annular stator core 15, the stator core 15 is described by exemplifying an aspect having a plurality of teeth 21 around which the coils 20 are wound. However, the present invention is not limited to this example. In a stator having a stator core formed by arranging a plurality of divided cores in an annular shape, each of the plurality of divided cores may employ a mode in which teeth around which a coil is wound are provided.

DESCRIPTION OF SYMBOLS 11 Rotating electrical machine 15 Stator core 17 Stator 17a Stator inner diameter part 19 Rotor 20 Coil 21 Teeth 23 Slot 25 The gap which faces a slot 27 Resin body spacer 31 Jig 37 The cylindrical part of a jig 37a The outer diameter part of a cylindrical part d4 Circumferential gap

Claims (5)

A rotating electrical machine comprising a stator having an annular stator core, and a rotor provided rotatably on the inner diameter side of the stator,
The stator core has a plurality of teeth around which a coil is wound,
Each of the teeth adjacent in the circumferential direction is disposed with a gap facing the slot from the rotor side between the respective radially inner ends.
In the gap, a resin spacer is provided so as to fill the gap. The rotating electrical machine according to claim 1,
The rotating electrical machine, wherein the resin body spacer is embedded in the gap so that a circumferential surface of an inner diameter portion of the stator is substantially flush over a circumferential direction of the stator. A stator for a rotating electrical machine having an annular stator core,
The stator core has a plurality of teeth around which a coil is wound,
Each of the teeth adjacent in the circumferential direction is disposed with a gap facing the slot from the rotor side between the respective radially inner ends.
A resin body spacer is provided in the gap so as to fill the gap. A stator for a rotating electrical machine according to claim 3,
The stator of a rotating electrical machine, wherein the resin body spacer is embedded in the gap so that a circumferential surface of an inner diameter portion of the stator is substantially flush over a circumferential direction of the stator. A method of manufacturing a rotating electrical machine comprising a stator having an annular stator core, and a rotor provided rotatably on the inner diameter side of the stator,
The stator core has a plurality of teeth around which a coil is wound,
Each of the teeth adjacent in the circumferential direction is disposed with a gap facing the slot from the rotor side between the respective radially inner ends.
Resin body spacers are provided in the gaps so as to fill the gaps,
A step of setting a jig having a cylindrical portion having an outer diameter equal to or larger than the outer diameter of the rotor and smaller than the inner diameter of the stator on the inner diameter side of the stator;
In a state where the cylindrical portion of the jig is set on the inner diameter side of the stator, the resin body spacer is made by injecting resin into a circular gap between the inner diameter portion of the stator and the outer diameter portion of the cylindrical portion. Forming,
The manufacturing method of the rotary electric machine characterized by the above-mentioned.

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