JP2022070482A - Insulation paper sheet for motor - Google Patents

Abstract

To provide an insulation paper sheet for motor capable of suppressing damage caused by actuation of stress in molding a coil.SOLUTION: An insulation paper sheet 37 is inserted into a slot 35 formed in a stator core 31 constituting a motor. The insulation paper sheet 37 insulates the stator core 31 and a coil 30 which is inserted into the slot 35. The insulation paper sheet 37 comprises: a non-protruding part 371 which is stored within the slot 35; and a protruding part 372 which protrudes in an axial direction of the stator core 31 from an end 35a of the slot 35. A stress relaxation part 373 which relaxes a stress to act on the protruding part 372 as folding the coil 30 is provided in the insulation paper sheet 37.SELECTED DRAWING: Figure 3

Description

The present invention relates to an insulating paper for a motor.

Conventionally, insulating papers for motors have been proposed (see, for example, Patent Documents 1 and 2).

Patent Document 1 discloses a motor in which a rotor is rotatably arranged inside a ring-shaped stator. In Patent Document 1, a plurality of slots are formed in the stator at equal intervals, coils are inserted into these slots, and the wall surface and the coil are provided in order to provide insulation between the wall surface constituting the slot and the coil. It is stated that an insulating paper is attached between the and.

Patent Document 2 discloses an armature of a rotary electric machine in which a plurality of slots are formed at equal intervals in a ring-shaped armature core formed by laminating thin steel plates. In Patent Document 2, a first armature coil and a second armature coil are mounted in a slot, and an insulating member for insulating between the first armature coil and the second armature coil. It is stated that is provided.

Japanese Unexamined Patent Publication No. 2006-217707 Japanese Unexamined Patent Publication No. 2000-41351

However, in the insulating papers described in Patent Documents 1 and 2, the bending stress of the coil acts on the insulating paper by bending (pulling) the coil in a predetermined direction during molding (processing) of the coil. Therefore, the end face of the insulating paper may be pulled and damaged.

Further, if the insulating paper is damaged during coil molding, the insulation between the coil and the stator core is not ensured, resulting in poor quality. Therefore, if damage to the insulating paper can be found during coil molding, it is possible to deal with it, but if damage to the insulating paper is overlooked, it is highly possible that a problem will occur. Further, when the insulating paper is rearranged, not only the molded (processed) coil cannot be reused, but also the man-hours for rearranging (re-doing) the insulating paper are required, which requires unnecessary cost.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an insulating paper for a motor capable of suppressing damage due to the action of stress during coil forming.

In order to achieve the above object, the present invention is configured as follows.

(1) The insulating paper for a motor according to the present invention is an insulating paper for a motor that is inserted inside a slot formed in a stator core constituting the motor and insulates the stator core and a coil inserted into the slot. It has a non-protruding portion housed inside the slot and a protruding portion protruding from the end of the slot in the axial direction of the stator core, and acts on the protruding portion as the coil is bent. It is characterized in that a stress relaxation portion for relaxing stress is provided.

According to the above configuration, during coil forming (machining), the bending stress of the coil acts on the protruding portion as the coil is bent in a predetermined direction, so that the protruding portion is pulled in a predetermined direction. Even so, the stress is relaxed by the stress relaxation portion of the protruding portion. Therefore, it is possible to prevent the protruding portion from being damaged.

(2) In the insulating paper for a motor according to the present invention, it is preferable that the protruding portion has a folded portion folded toward the end of the slot, and the folded portion is provided with the stress relaxation portion. .. With this configuration, the rigidity can be increased by providing the folded portion, so that the stress relaxation portion can be provided in the highly rigid portion. Therefore, even if stress is applied to the folded portion due to the bending of the coil during coil forming (processing), it is possible to prevent the protruding portion from being damaged.

(3) In the insulating paper for a motor according to the present invention, when the protruding portion is inserted into the slot together with the coil, the inward portion facing the coil side and the outward portion facing the opposite side of the inward portion. The stress relief portion is composed of a curved portion that is curved or bent from the outward portion toward the inward portion in the protruding portion, and the curved portion is the direction in which the coil is inserted into the slot. It is preferable that it is formed so as to extend along the. With this configuration, since the coil is fixed in a state of being inserted into the slot by the curved portion, the positioning of the coil and the attitude control before machining can be easily performed in the slot.

(4) In the insulating paper for a motor according to the present invention, the stress relaxation portion can be extended or extended by receiving stress from the inside to the outside of the slot while being inserted into the slot. It should be done. With this configuration, when stress is applied to the stress relaxation portion due to bending of the coil, the stress is absorbed by the extension or extension of the stress relaxation portion, so that it is possible to prevent the protruding portion from being damaged. ..

(5) In the insulating paper for a motor according to the present invention, a plurality of the coils are housed side by side in the slot, and the stress relaxation unit can be arranged between the adjacent coils in the slot. It is good that it is formed in. With this configuration, each of the plurality of coils can be easily positioned at a predetermined position in the slot with reference to the stress relaxation portion, and the attitude control before forming (machining) the coils can be easily performed. be able to.

(6) In the insulating paper for a motor according to the present invention, the stress relaxation portion is one side of the protrusion in the circumferential direction of the stator core with respect to the coil in a state of being inserted together with the coil into the slot. And it is preferable that it is provided in a portion adjacent to the other side. With this configuration, when stress is applied to one side and the other side of the stator core in the circumferential direction during coil forming (machining) due to bending of the coil, the protrusions are formed on one side and the other side in the circumferential direction of the stator core. On the other hand, damage can be suppressed.

(7) In the insulating paper for a motor according to the present invention, the protruding portion has a folded portion folded toward the end of the slot, and the stress relaxation portion is the entire height direction of the folded portion. It should be provided in the area. With this configuration, the coil can be easily positioned in a predetermined position in the slot. Further, according to the above configuration, since the stress associated with the bending of the coil is relaxed in the entire region in the height direction of the folded portion, the protruding portion is damaged even if a strong stress is applied to the protruding portion. Can be suppressed.

(8) In the insulating paper for a motor according to the present invention, the protruding portion has a folded portion folded toward the end of the slot, and the end of the folded portion and the surface of the stator core are predetermined. It is preferable that they are arranged at intervals. With this configuration, it is possible to secure an insulating distance between the end portion of the folded portion and the surface of the stator core.

(9) The motor according to the present invention is rotatably arranged on the inner peripheral side of the stator core and the stator provided with the above-mentioned insulating paper for the motor, and magnets of S pole and N pole are alternately arranged along the circumferential direction. It is characterized by having a rotor.

According to the above configuration, during coil forming (machining), the bending stress of the coil acts on the protruding portion as the coil is bent in a predetermined direction, so that the protruding portion is pulled in a predetermined direction. Even so, the stress is relaxed by the stress relaxation portion of the protruding portion. Therefore, it is possible to prevent the protruding portion from being damaged. As a result, it is possible to obtain a motor provided with an insulating paper for a motor capable of suppressing damage due to the action of stress during coil molding.

According to the aspect of the present invention, it is possible to provide an insulating paper for a motor capable of suppressing damage due to the action of stress during coil forming.

It is sectional drawing for demonstrating the whole structure of the motor which concerns on one Embodiment of this invention. It is a perspective view which shows the stator by this embodiment. It is an enlarged view of the area A shown in FIG. It is a perspective view of the stator which showed the coil partially omitted in FIG. It is an enlarged view of the area B shown in FIG. (A) is a plan view of the slot of the stator as viewed from the axial direction. (B) is a cross-sectional view taken along the line DD in FIG. 6 (a). It is a perspective view of the stator shown by omitting the coil in FIG. It is an enlarged view of the region C shown in FIG. 7. It is a perspective view which shows the insulating paper by this embodiment.

Hereinafter, a motor provided with an insulating paper for a motor and an insulating paper for a motor according to an embodiment of the present invention will be described with reference to the accompanying drawings. These figures are schematic views and do not necessarily show the sizes in accurate ratios. Further, in the figure, similar components are indicated by the same reference numerals.

(motor)
The configuration of the motor 1 will be described with reference to FIG.

As shown in FIG. 1, the motor 1 according to the present embodiment includes a case 2, a stator 3, a rotor 4, and an output shaft 5. The motor 1 is a traveling motor mounted on a vehicle such as a hybrid vehicle or an electric vehicle. The configuration of the motor 1 is not limited to the above example, and can be applied to motors for other purposes such as power generation motors mounted on vehicles.

The case 2 is formed in a cylindrical shape for accommodating the stator 3 and the rotor 4. The stator 3 is formed in an annular shape. The stator 3 is attached to the inner peripheral surface of the case 2. The stator 3 includes a stator core 31 and a coil 30 attached to the stator core 31. The stator 3 causes a rotating magnetic field to act on the rotor 4.

The rotor 4 is rotatably arranged on the inner peripheral side of the stator core 31. The rotor 4 includes a rotor core 41 and S-pole and N-pole magnets (not shown) attached to the rotor core 41. Magnets of S pole and N pole are alternately arranged along the circumferential direction in the rotor core 41. The output shaft 5 is connected to the rotor 4. The output shaft 5 outputs the rotation of the rotor 4 as a driving force.

(Stator)
Next, the configuration of the stator will be described in detail with reference to FIGS. 2 to 9.

As shown in FIGS. 2 and 3, the stator core 31 is formed in an annular shape (cylindrical shape) that surrounds the rotor 4 (see FIG. 1) from the radial outside of the stator core 31. The stator core 31 is configured by laminating a plurality of annular plates 32 formed by punching or the like on an electromagnetic steel sheet in the axial direction of the stator core 31. In the following description, the radial direction of the stator core 31 may be simply described as "diametrical direction", and the axial direction of the stator core 31 may be simply described as "axial direction".

The stator core 31 has an annular yoke portion 33, a plurality of teeth portions 34, and a plurality of slots 35. The plurality of tooth portions 34 protrude inward in the radial direction from the yoke portion 33. Each slot 35 is formed between two tooth portions 34 adjacent to each other in the circumferential direction of the stator core 31. In the following description, the circumferential direction of the stator core 31 may be simply referred to as "circumferential direction". Further, each slot 35 is formed so as to penetrate the stator core 31 along the axial direction. Each slot 35 has an inner surface 36 (see FIG. 6A) facing the coil 30.

As shown in FIG. 6A, the inner surface 36 of each slot 35 has a pair of side surfaces 36a and side surfaces 36b, a back surface 36c, and a pair of tip end faces 36d and tip end faces 36e. The pair of side surfaces 36a and 36b are formed by different tooth portions 34 and are separated from each other in the circumferential direction. The pair of side surfaces 36a and 36b are substantially parallel to each other. The back surface 36c connects the radial outer ends of the pair of side surfaces 36a and 36b. The pair of tip end faces 36d and tip end faces 36e are separated from each other in the circumferential direction.

As shown in FIGS. 2 to 5, the coil 30 is a three-phase coil composed of a U phase, a V phase, and a W phase. The coil 30 is inserted from the outside of the stator core 31 toward the slot 35 along the axial direction. Further, as shown in FIG. 3, the portion of the coil 30 exposed to the outside of the slot 35 is bent toward one side or the other side in the circumferential direction.

As shown in FIGS. 2 to 5, a motor insulating paper 37 (hereinafter referred to as an insulating paper) is arranged between the stator core 31 and the coil 30. The insulating paper 37 is for insulating the stator core 31 and the plurality of coils 30 (six in this embodiment). The plurality of coils 30 are housed side by side in the radial direction inside the slot 35. Further, the insulating paper 37 is arranged inside the slot 35 so as to surround the entire periphery of the plurality of coils 30.

As shown in FIGS. 5 to 9, the insulating paper 37 has a non-protruding portion 371 housed inside the slot 35 and a protruding portion 372 protruding in the axial direction from the end portion 35a of the slot 35. .. The protrusion 372 has an inward portion 37a facing the coil 30 side and an outward portion 37b facing the side opposite to the inward portion 37a in a state of being inserted into the slot 35 together with the coil 30.

Here, in the present embodiment, the insulating paper 37 is provided with a stress relaxation portion 373. The stress relaxation portion 373 is for relaxing the stress acting on the protrusion 372 due to bending of the coil 30 with respect to one side and the other side in the circumferential direction during molding (machining) of the coil 30.

As shown in FIG. 9, the protrusion 372 has a folded portion 372a that is folded back toward the end 35a of the slot 35 (toward away from the slot 35). The folded-back portion 372a is formed at both one end portion and the other end portion in the axial direction (height direction) of the insulating paper 37. The stress relaxation portion 373 is provided in the entire region of the insulating paper 37 in the axial direction (height direction). In other words, the stress relaxation portion 373 is provided on the non-projecting portion 371 and the protruding portion 372 (folded portion 372a) in the axial direction (height direction) of the insulating paper 37.

Further, the stress relaxation portion 373 is formed so as to be able to extend or extend by receiving stress from the inside to the outside of the slot 35 in a state of being inserted into the slot 35. For example, the stress relaxation portion 373 is composed of a curved portion 373a that is curved from the outward portion 37b toward the inward portion 37a in the protruding portion 372. Further, the curved portion 373a is formed in the non-protruding portion 371 so as to extend along the axial direction (insertion direction) of the coil 30 with respect to the slot 35. Further, the curved portion 373a and the curved portion 373a (in the radial direction) are connected by a straight portion 373b. The curved portion 373a of the stress relaxation portion 373 may be formed not only in a curved shape but also in a bent shape.

As shown in FIGS. 5 and 6A, the stress relaxation portion 373 is formed so as to be displaceable between adjacent coils 30 in the slot 35. As shown in FIG. 9, when the stress relaxation portion 373 is inserted into the slot 35 together with the coil 30, the stress relaxation portion 373 is one side and the other side of the non-protruding portion 371 and the protruding portion 372 in the circumferential direction with respect to the coil 30. It is provided in the part adjacent to. Further, as shown in FIG. 6B, the end portion 372b of the folded-back portion 372a and the surface 31a of the stator core 31 are arranged at a predetermined interval L with respect to the axial direction (height direction).

According to the embodiment described above, the following effects (1) to (9) can be obtained.

(1) In the insulating paper 37 according to the present embodiment, a stress relaxation portion 373 that relaxes the stress acting on the protrusion 372 due to the bending of the coil 30 is provided. According to the above embodiment, when the coil 30 is formed (processed), the bending stress of the coil 30 acts on the protruding portion 372 as the coil 30 is bent to one side and the other side in the circumferential direction, and the coil 30 protrudes. Even if the portion 372 is pulled to one side and the other side in the circumferential direction, the stress is relaxed by the stress relaxation portion 373 of the protrusion 372. Therefore, it is possible to prevent the protrusion 372 from being damaged.

(2) In the insulating paper 37 according to the present embodiment, the stress relaxation portion 373 is provided in the folded portion 372a. According to the above embodiment, the rigidity can be increased by providing the folded-back portion 372a. Therefore, the stress relaxation portion 373 can be provided in the portion having high rigidity. As a result, even if stress is applied to the folded portion 372a due to the bending of the coil 30 during the molding (processing) of the coil 30, it is possible to prevent the protruding portion 372 from being damaged.

(3) In the insulating paper 37 according to the present embodiment, the curved portion 373a is formed so as to extend along the insertion direction of the coil 30 with respect to the slot 35. According to the above embodiment, the coil 30 is fixed in a state of being inserted into the slot 35 by the curved portion 373a. Therefore, the positioning of the coil 30 and the attitude control before machining can be easily performed in the slot 35.

(4) In the insulating paper 37 according to the present embodiment, the stress relaxation portion 373 can be stretched or stretched by receiving stress from the inside to the outside of the slot 35 in a state of being inserted into the slot 35. bottom. According to the above embodiment, when stress is applied to the stress relaxation portion 373 due to bending of the coil 30, the stress relaxation portion 373 is stretched or stretched to absorb the stress. Therefore, it is possible to prevent the protrusion 372 from being damaged.

(5) In the insulating paper 37 according to the present embodiment, the stress relaxation portion 373 is formed so that it can be arranged between the adjacent coils 30 in the slot 35. According to the above embodiment, the coil 30 can be easily positioned at a predetermined position in the slot 35 with reference to the stress relaxation unit 373, and the posture of the coil 30 before molding (machining) can be easily controlled. be able to.

(6) In the insulating paper 37 according to the present embodiment, a portion of the protruding portion 372 adjacent to one side and the other side in the circumferential direction of the stator core 31 with respect to the coil 30 in a state of being inserted into the slot 35 together with the coil 30. Was provided with a stress relaxation unit 373. According to the above embodiment, when stress is applied to one side and the other side in the circumferential direction of the stator core 31 due to bending of the coil 30 during molding (machining) of the coil 30, the protruding portion 372 is located on one side in the circumferential direction of the stator core 31. It is possible to prevent damage to one side and the other side.

(7) In the insulating paper 37 according to the present embodiment, the stress relaxation portion 373 is provided in the entire region in the axial direction (height direction) of the folded portion 372a. According to the above embodiment, the coil 30 can be easily positioned in a predetermined position in the slot 35. Further, according to the above embodiment, the stress associated with the bending of the coil 30 is relaxed in the entire region in the axial direction (height direction) of the folded portion 372a. Therefore, even if a strong stress is applied to the protruding portion 372, it is possible to prevent the protruding portion 372 from being damaged.

(8) In the insulating paper 37 according to the present embodiment, the end portion 372b of the folded-back portion 372a and the surface 31a of the stator core 31 are arranged at a predetermined interval L. According to the above embodiment, it is possible to secure an insulating distance between the end portion 372b of the folded-back portion 372a and the surface 31a of the stator core 31.

(9) The motor 1 according to the present embodiment is configured by using a stator 3 provided with insulating paper 37 and a rotor 4 in which magnets of S pole and N pole are alternately arranged along the circumferential direction. According to the above embodiment, when the coil 30 is formed (processed), the bending stress of the coil 30 acts on the protruding portion 372 as the coil 30 is bent to one side and the other side in the circumferential direction, and the coil 30 protrudes. Even if the portion 372 is pulled to one side and the other side in the circumferential direction, the stress is relaxed by the stress relaxation portion 373 of the protrusion 372. Therefore, it is possible to prevent the protrusion 372 from being damaged. As a result, it is possible to obtain the motor 1 provided with the insulating paper 37 capable of suppressing damage due to the action of stress during the molding of the coil 30.

(Other variants)
The above embodiment may have a configuration modified as follows.

In the above embodiment, an example in which the stress relaxation portion is composed of a curved portion is shown, but the present invention is not limited to this. In the present invention, the shape of the stress relaxation portion may be arbitrarily determined so that the stress associated with the bending of the coil can be relaxed.

In the above embodiment, an example in which the coil is bent to one side and the other side in the circumferential direction at the time of forming (processing) the coil is shown, but the present invention is not limited to this. In the present invention, when the coil is bent in a direction other than one side and the other side in the circumferential direction, it is preferable to provide a stress relaxation portion so that the stress acting in the bending direction of the coil can be relaxed.

In the above embodiment, an example is shown in which a bent portion is provided on the insulating paper and a stress relaxation portion is provided on the bent portion, but the present invention is not limited to this. For example, if it is possible to relieve the stress acting on the protruding portion due to the bending of the coil, it is not always necessary to provide the bent portion. In the present invention, it is preferable to provide a stress relaxation portion at an arbitrary position according to the magnitude of the stress acting on the protrusion.

In the above embodiment, an example of forming the curved portion so as to extend along the insertion direction of the coil with respect to the slot has been shown, but the present invention is not limited to this. For example, if it is possible to relieve the stress acting on the protrusions due to the bending of the coil, it is also possible to form the bends so as to extend along the direction intersecting the insertion direction of the coil with respect to the slot. Is.

In the above embodiment, an example in which the stress relaxation portion is arranged in all the spaces between adjacent coils is shown, but the present invention is not limited to this. For example, the stress relaxation portion may be arranged between some adjacent coils.

In the above embodiment, an example is shown in which the stress relaxation portion is provided in the portion of the protruding portion adjacent to one side and the other side in the circumferential direction of the stator core with respect to the coil, but the present invention is not limited to this. For example, the stress relaxation portion may be provided on one side (one side or the other side) in the circumferential direction of the stator core.

In the above embodiment, an example in which the stress relaxation portion is provided in the entire area in the height direction of the folded portion is shown, but the present invention is not limited to this. For example, the stress relaxation portion may be partially provided in the height direction at the folded portion.

In the above embodiment, an example is shown in which the end portion of the folded portion and the surface of the stator core are arranged at a predetermined interval, but the present invention is not limited to this. For example, if the insulation between the end of the folded portion and the surface of the stator core is ensured, the end of the folded portion and the surface of the stator core may be brought into contact with each other.

All of the above embodiments are examples of the indications of the present invention, and it is natural that any other embodiment within the scope of the claims is included in the technical scope of the invention.

1: Motor 3: Stator 4: Rotor 30: Coil 31: Stator core 31a: Stator core surface 35: Slot 35a: Slot end 37: Insulating paper (insulating paper for motor)
37a: Inward part 37b: Outward part 371: Non-protruding part 372: Protruding part 372a: Folded part 372b: Folded part end 373: Stress relaxation part 373a: Curved part

Claims (3)

A motor insulating paper inserted inside a slot formed in a stator core constituting a motor to insulate the stator core and a coil inserted into the slot.
A non-protruding portion housed inside the slot,
It has a protrusion that protrudes from the end of the slot in the axial direction of the stator core.
An insulating paper for a motor, characterized in that a stress relaxation portion for relaxing the stress acting on the protrusion due to bending of the coil is provided. The protrusion has a folded portion that is folded back toward the end of the slot.
The insulating paper for a motor according to claim 1, wherein the folded portion is provided with the stress relaxation portion. The protruding portion has an inward portion facing the coil side and an outward portion facing the opposite side to the inward portion in a state of being inserted into the slot together with the coil.
The stress relaxation portion is composed of a curved portion that is curved or bent from the outward portion toward the inward portion in the protrusion.
The insulating paper for a motor according to claim 1 or 2, wherein the curved portion is formed so as to extend along an insertion direction of the coil with respect to the slot.

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