JP2022134636A - Inter-phase insulation paper and rotary electric machine - Google Patents

Abstract

To provide an inter-phase insulation paper capable of improving a varnish impregnation property while securing inter-phase insulation of a rotary electric machine.SOLUTION: Inter-phase insulation paper comprises: a leg to be inserted into a slot of a stator core; and a body that is coupled to the leg and is disposed so as to protrude from an end surface of the stator core to perform inter-phase insulation of a coil end part of a coil. The body includes: a one end side surface part positioned close to an end on one side in the circumferential direction of the stator core and an other end side surface part positioned close to an end on the other side; and a center surface part that is positioned between the one end side surface part and the other end side surface part and has a portion folded toward the one end side surface part so as to abut on one surface of the one end side surface part. On the center surface part, a hole is formed at a position overlapped with at least either of the center surface part's folded one surface or the one end side surface part.SELECTED DRAWING: Figure 4

Description

The present invention relates to interphase insulating paper and rotating electric machines.

For example, in a stator of a three-phase AC motor, U-phase, V-phase, and W-phase coils are attached to teeth of a stator core. In the case of distributed winding, the U-phase, V-phase, and W-phase coils are arranged adjacent to each other in the radial direction of the stator core, and the positions of the coils of each phase are shifted from each other in the circumferential direction of the stator core. In order to ensure insulation between adjacent coils of different phases, interphase insulating papers are arranged between the different phase coils of the stator. In addition, each coil of the heterophase of the stator is dripped and impregnated with varnish.

As this type of interphase insulating paper, when inserted into the stator core, it protrudes from both end surfaces of the stator core, respectively, and insulates the coil end portions of each phase. There is known a shape having a pair of legs connecting the .

In Patent Document 1, a main body portion of interphase insulating paper has a surface on one end located near one end in the circumferential direction of the stator core, a surface on the other end located near the end on the other side, and a surface on the other end located near the end on the other side. There has been proposed an interphase insulating paper having a central surface that is bent upward toward one side of the surface on the one end side between the surface and the side surface of the other end.

Japanese Patent Application Laid-Open No. 2020-145900

For example, if varnish is dripped from the inner diameter side and the outer diameter side of a different phase coil to a rotating electric machine in which the phases are insulated by this type of interphase insulating paper, the inner and outer phase coils will is sufficiently impregnated with varnish, but the intermediate phase coil is not sufficiently impregnated with varnish. Insufficient varnish impregnation may reduce the adhesion ability of the coil ends. If the fixing ability is lowered, the vibration of the coil end is not sufficiently suppressed, the insulation performance is lowered, and the long-term insulation reliability of the rotary electric machine is adversely affected.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides interphase insulating paper capable of improving varnish impregnation properties of coil ends while ensuring interphase insulation of a rotating electric machine.

One aspect of the present invention is an interphase insulating paper that provides insulation between radially adjacent coils of different phases in a stator core of a rotating electric machine. The interphase insulating paper includes legs to be inserted into the slots of the stator core, and a body connected to the legs and arranged to protrude from the end face of the stator core to insulate the coil end portions of the coil from phase to phase. , the main body portion is located between one end side portion located near one end in the circumferential direction of the stator core and the other end side portion located near the other end in the circumferential direction of the stator core, and between the one end side portion and the other end side portion; and a central face portion partially folded in the direction of the one end side face so as to abut on one side of the one end side face, and the central face has the folded one face of the central face or the one end side face A hole is formed at a position that overlaps with at least one of

In the interphase insulating paper described above, the hole may be formed so as to partially overlap with the vertex of the folded central surface.

In the interphase insulating paper described above, a pair of body portions may be provided so as to protrude from both end surfaces of the stator core, the leg portions may connect the pair of body portions, and the hole portion may be provided in each They may be formed on the central surface of the main body.

A rotating electric machine according to another aspect of the present invention includes a stator core, multi-phase coils arranged adjacent to each other in a radial direction of the stator core, and a plurality of coils arranged along the circumferential direction of the stator core to insulate between the different phase coils. and the interphase insulating paper described above.

According to the phase-to-phase insulating paper of one aspect of the present invention, it is possible to improve the varnish impregnation property of the coil ends while ensuring the phase-to-phase insulation of the rotating electric machine.

It is the figure which looked at the rotary electric machine of this embodiment from the coil end side. FIG. 4 is a diagram showing a state in which a U-phase coil and interphase insulating paper are attached to a stator core; 4A is a diagram showing a state in which interphase insulating paper is attached between different phase coils of the rotating electric machine of the present embodiment, and FIG. It is a figure which shows the structural example of the interphase insulating paper in this embodiment. It is a figure which shows the structural example of the interphase insulating paper of a comparative example. FIG. 4 is a partially enlarged view of a stator core to which a U-phase coil and interphase insulating paper of a comparative example are attached; It is a figure which shows the state which drips and impregnates a varnish. FIG. 3 is a partially enlarged view of a U-phase coil and a stator core to which the interphase insulating paper according to the present embodiment is attached;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In order to facilitate the understanding of the description in the embodiments, structures and elements other than the main part of the present invention will be described with simplification or omission. Moreover, in the drawings, the same reference numerals are given to the same elements. It should be noted that the shape, dimensions, etc. of each element shown in the drawings are schematically shown, and do not represent the actual shape, dimensions, etc.

FIG. 1 is a diagram of a rotating electric machine 1 of the present embodiment as viewed from the coil end side.
The rotary electric machine 1 of this embodiment is a three-phase alternating current inner rotor type motor, and has a rotor 3 and a stator 2 . In FIG. 1, the extension direction (axial direction) of the rotation axis Ax of the rotary electric machine 1 is perpendicular to the paper surface.

The rotor 3 is rotatably supported about the rotation axis Ax by a bearing (not shown). A stator 2 is arranged on the outer circumference of the rotor 3 with an air gap therebetween. In the rotary electric machine 1, the magnetic field of the stator 2 is sequentially switched by current control of each phase coil, which will be described later, so that the rotor 3 rotates about the rotation axis Ax due to the attraction or repulsion force with the magnetic field of the rotor 3. do.

The stator 2 has a stator core 21 and a U-phase coil 22u, a V-phase coil 22v, and a W-phase coil 22w that are distributed around the stator core 21 .

A plurality of radially inward protruding teeth 21a are provided on the inner circumference of the stator core 21 along the circumferential direction, and slots 21b are formed between the teeth 21a (see FIG. 2). A U-phase coil 22u, a V-phase coil 22v, and a W-phase coil 22w are distributed around the teeth 21a of the stator core 21 in this order from the outer circumference of the stator core 21 . The U-phase, V-phase, and W-phase coils 22u, 22v, and 22w are arranged adjacent to each other in the radial direction of the stator core 21, and the positions of the coils of each phase are shifted from each other in the circumferential direction of the stator core 21. FIG.

In order to prevent contact with adjacent coils of different phases, interphase insulating paper 10 is provided between the U-phase coil 22u and the V-phase coil 22v, and between the V-phase coil 22v and the W-phase coil 22w. are placed.

FIG. 2 is a diagram showing a state in which the U-phase coil 22u and the interphase insulating paper 10 are attached to the stator core 21. As shown in FIG. FIGS. 3A and 3B are schematic diagrams showing a state in which interphase insulating paper is attached between different phase coils of the rotary electric machine 1. FIG.
When attaching the coil to the stator core 21, first, in the circumferential direction of the stator core 21, the U-phase coil 22u is inserted into the slots 21b of the stator core 21 so as to straddle the plurality of teeth portions 21a. A plurality (eight in the present embodiment) of the U-phase coils 22u are attached so as to line up along the circumferential direction of the stator core 21 .

After the U-phase coil 22u is inserted into the stator core 21, a plurality of interphase insulating papers are provided along the circumferential direction of the stator core 21 on the inner peripheral side of the U-phase coil 22u in order to insulate the coils of different phases. 10 are arranged in a ring. The arrangement of the interphase insulating paper 10 of this embodiment will be described later with reference to FIG.

After placing the interphase insulating paper 10 on the inner peripheral side of the U-phase coil 22u, the V-phase coil 22v is attached to the inner peripheral side of the U-phase coil 22u on the stator core 21 . A plurality of sheets of interphase insulating paper 10 are also arranged in a ring on the inner peripheral side of the V-phase coil 22v. After that, the W-phase coil 22w is attached to the stator core 21 on the inner peripheral side of the V-phase coil 22v. The attachment of the V-phase coil 22v and the W-phase coil 22w is the same as that of the U-phase coil 22u, so redundant description will be omitted. As described above, the U-phase, V-phase, and W-phase coils 22u, 22v, and 22w are attached to the stator core 21, respectively.

Next, the dropping of the varnish onto the coil of the stator core 21 will be described with reference to the configuration of the interphase insulating paper of the comparative example.
FIG. 5 is a diagram showing a configuration example of the interphase insulating paper 40 of the comparative example. The interphase insulating paper 40 of the comparative example has a pair of body portions 41 and 41 and a pair of leg portions 42 and 42 .

The pair of main body portions 41, 41 are each rectangular and arranged in parallel with each other with a space therebetween in the vertical direction in the figure. The pair of main body portions 41, 41 protrude from both end surfaces of the stator core 21 when the interphase insulating paper 40 is inserted into the stator core 21, and insulate the coil end portions of each phase.

The pair of leg portions 42, 42 are arranged at the left and right ends of the body portion 41 in the drawing, and extend vertically in the drawing to connect the pair of body portions 41, 41 together. The pair of legs 42 , 42 are both inserted into slots 21 b of stator core 21 when interphase insulating paper 40 is inserted into stator core 21 .

FIG. 6 is a partially enlarged view of the stator core 21 to which the U-phase coil 22u and the interphase insulating paper 40 are attached.

The interphase insulating paper 40 inserted into the stator core 21 is supported by a plurality of leg portions 42 having a body portion 41 curved along the circumferential direction and inserted into the slots 21b. As the interphase insulating paper 40 alone, the main body portion 41 protrudes radially outward, so that the main body portion 41 does not easily fall radially outward of the stator core 21 , but the main body portion 41 falls radially inward of the stator core 21 . Cheap. Moreover, although the adjacent interphase insulating papers 40 are inserted into the tooth portions 21a of the stator core 21 while overlapping each other, the overlapping portions of the adjacent interphase insulating papers 40 interfere with each other.

Therefore, such interference of the interphase insulating paper 40 may cause the main body portion 41 of the interphase insulating paper 40 to bend toward the inner side in the radial direction of the stator core 21 (falling of the interphase insulating paper). If the interphase insulating paper 40 falls down as described above, the body portion 41 of the interphase insulating paper 40 interferes with the coil inserter when inserting the coil with a winding machine, for example, which is not preferable. In addition, if the coil is inserted with the interphase insulating paper 40 tilted, it may lead to insulation failure of the coil between different phases.

FIG. 7 shows a state in which the varnish 30 is dripped from the inner diameter side and the outer diameter side of the stator core 21 to impregnate the stator core 21 with interphase insulating paper attached between different phase coils of the electric rotating machine 1 of the present embodiment.
Dropping of the varnish 30 onto the coil of each phase is performed by a varnish dropping device (the main body is not shown). A varnish dropping nozzle 31 is arranged in the varnish dropping device. A predetermined amount of varnish 30 is dropped from the varnish dropping nozzle 31 to impregnate the coil of each phase with the varnish 30 .

It is assumed that after the interphase insulating paper 40 as shown in FIG. 5 is arranged on each phase coil, the varnish 30 is dripped from the outer and inner peripheral sides of the stator core 21 as shown in FIG. 7 to impregnate. That is, when the varnish 30 is dripped from the U-phase coil 22u side and the W-phase coil 22w side to be impregnated, the U-phase coil 22u located on the outer peripheral side of the stator core 21 and the W-phase coil 22u located on the inner peripheral side of the stator core 21 are impregnated. The coil 22w is impregnated with the varnish 30 sufficiently. However, the V-phase coil 22v includes an interphase insulating paper 40 arranged between the V-phase coil 22v and the U-phase coil 22u and an interphase insulating paper 40 arranged between the V-phase coil 22v and the W-phase coil 22w. The insulating paper 40 may not impregnate the varnish 30 well. If the V-phase coil 22v is not well impregnated with the varnish 30, the adhesion ability of the coil is reduced. As a result, the vibration of the coil end is not sufficiently suppressed, and the insulation performance may deteriorate.

FIG. 4 is a diagram showing a configuration example of the interphase insulating paper 10 in this embodiment.
The interphase insulating paper 10 of this embodiment has a pair of body portions 11 and 11 and a pair of leg portions 13 and 13 that are arranged between coil ends on both end sides of adjacent coils of different phases. The arrangement and function of the body portion 11 and the leg portion 13 are the same as those of the body portion 41 and the leg portion 42 shown in the comparative example of FIG. Further, the body portion 11 is provided with a one-end side portion 11a located near the end portion of the stator core 21 on one side in the circumferential direction. Furthermore, the other end side surface portion 11b located near the other end portion is provided. Further, the body portion 11 has a central surface portion 11c located between the one end side portion 11a and the other end side portion 11b. The center surface portion 11c is a surface portion subjected to a folding process so that a portion of the main body portion 11 is positioned on one side of the one end side portion 11a. It meanders and bends so that one side can come into contact with the top).

In the interphase insulating paper 10 of the present embodiment, the hole 12 is formed at a position that overlaps at least one folded surface of the center surface portion 11c or one end side surface portion 11a. At least one hole portion 12 is formed in each of the pair of central surface portions 11c, 11c. Further, the hole portion 12 is circular and formed as a through hole.

In FIG. 4, the hole 12 has two circular holes so that the center of each hole 12 coincides with the turning point (vertex of the mountain when folded) 11d when the central surface 11c is bent. It shows an example in which one is formed. However, the present invention is not limited to this, and long holes (loose holes) are formed in one or both of the central surface portions 11c and 11c in the axial direction (vertical direction in FIG. 4) or the circumferential direction (horizontal direction in FIG. 4) of the main body portion 11. You can do it. Further, a circular hole and the elongated hole may be formed in the central surface portions 11c, 11c, respectively.

Moreover, as shown in FIG. 4, each hole portion 12 may be formed so as to partially overlap with the turning point 11d of the central surface portion 11c. Since the central surface portion 11 is folded, the folding point 11d and its surroundings have high rigidity in the axial direction (vertical direction in FIG. 4) among the portions of the interphase insulating paper 10, and are hard to bend. Therefore, if each hole 12 is formed so as to partially overlap with the folding point 11d, the decrease in rigidity can be minimized.

Further, the interphase insulating paper 10 of the present embodiment is arranged so that the folding point 11d of the central surface portion 11c protrudes toward the inner peripheral side of the stator core 21. As shown in FIG. Therefore, when the varnish 30 is dripped from the outer peripheral side of the stator core 21, the varnish 30 is likely to flow into each different phase on the inner peripheral side if the hole 12 is formed at the turn-around point 11d even partially overlapping. , the V-phase coil 22v is impregnated with the varnish 30 is improved.

In the example of FIG. 4, the hole portions 12 are arranged on a line that divides the dimension of each body portion 11 in the axial direction (vertical direction in FIG. 4) into three. However, it is not limited to this, and may be formed at arbitrary intervals.

FIG. 8 is a partially enlarged view of the stator core 21 to which the U-phase coil 22u and the interphase insulating paper 10 of the present embodiment are attached.
As shown in FIG. 8 , the interphase insulating paper 10 of the present embodiment is configured such that the main body portion 11 of the interphase insulating paper 10 adjacent along the circumferential direction of the stator core 21 (on the left side in FIG. 8 ) 11b is placed on one end side surface portion 11a of the body portion 11 of the other interphase insulating paper 10 (right side in FIG. 8). Then, the leg portion 13 of one (the left side in FIG. 8) of the interphase insulating paper 10 is inserted between the tooth portions 21a.

After that, on the other end side surface portion 11b of the main body portion 11 of one interphase insulating paper 10 (left side in FIG. 8), the central surface portion 11c of the main body portion 11 of the other (right side in FIG. 8) interphase insulating paper 10 is placed. placed so that the At that time, between the center surface portion 11c abutting the one end side surface portion 11a of the main body portion 11 of the other interphase insulating paper 10 (the right side in FIG. 8) and the one end side surface portion 11a, one side (in FIG. 8, Left) interphase insulating paper 10 is inserted so as to sandwich the other end side surface portion 11b of the main body portion 11 . Next, the legs 13, 13 of the interphase insulating paper 10 are sequentially inserted between the tooth portions 21a, and a plurality of sheets (eight in this embodiment) of the interphase insulating paper 10 are inserted on the inner peripheral side of the U-phase coil 22u. are arranged in the same manner as above over the entire circumference of the

Next, the V-phase coil 22v is attached to the stator core 21 on the inner peripheral side of the U-phase coil 22u. A plurality of sheets of interphase insulating paper 10 are arranged in an annular shape in the same manner as described above on the inner peripheral side of the V-phase coil 22v.

In the stator core 21 of the rotary electric machine 1 according to the present embodiment, the other end side surface portion 11b of the main body portion 11 of the interphase insulating paper 10 on one side (left side in FIG. 8) Interphase insulating paper 10 is sandwiched between center surface portion 11c abutting on one end side surface portion 11a of body portion 11 of interphase insulating paper 10 and the one end side surface portion 11a. Therefore, the interphase insulating paper 10 is less likely to fall radially inward of the stator core 21 . As a result, inter-phase insulation of coils between different phases can be ensured, and insulation failure can be prevented. Furthermore, when the varnish 30 is dripped from the outer and inner peripheral sides of the stator core 21 and impregnated with the varnish 30, the holes 12 of the plurality of interphase insulating papers 10 arranged between the coils of the different phases cause the varnish 30 to spread in the middle. The V-phase coil 22v, which is the phase coil, is also easily impregnated.

Therefore, according to the present embodiment, the V-phase coil 22v is easily impregnated with the varnish 30 by the holes 12 formed in the interphase insulating paper 10, and each coil end including the V-phase coil 22v is easily impregnated with the varnish 30. On the other hand, as the impregnating property of the varnish 30 improves, the filling amount of the varnish 30 also increases. This improves the adherence of each coil end including the V-phase coil 22v. Furthermore, by improving the adhesiveness, it is possible to suppress a decrease in vibration of the coil end. A reduction in the vibration of the coil ends can also prevent deterioration in the insulation of the coil ends caused by the vibration of the coil ends.

Further, in the present embodiment, even if each hole 12 is formed at a position overlapping at least one side of the folded center surface 11c or one end side surface 11a, each hole 12 may , left) are overlapped with a part of the interphase insulating paper 10 . That is, when the interphase insulating paper 10 on one side (left side in FIG. 8) and the interphase insulating paper 10 on the other side (right side in FIG. 8) are arranged as described above, the portions that come into contact with the respective hole portions 12 Since there is the interphase insulating paper 10 in the , the hole 12 does not penetrate between the phases. Therefore, it is possible to prevent a short circuit between the phases.

The present invention is not limited to the above embodiments, and various improvements and design changes may be made without departing from the scope of the present invention.

For example, the number of holes 12, 12 formed by one central surface portion 11c and the other central surface portion 11c may be changed. The number of units 12 may be different. Further, for example, the hole portion 12 may be formed in a rectangular shape instead of a circular shape. Further, each hole 12 should be formed at a position that does not overlap with the folding point 11d as long as it overlaps with at least one of the folded sides of the center surface 11c or one side surface 11a as described above. may Further, the holes 12 may be formed in the center surface portion 11c at positions that partially overlap with the folding point 11d and positions that do not overlap with the folding point 11d.

Further, the interphase insulating paper 10 does not have to have a shape in which the body portion 11 is connected by the leg portions 13 . For example, the interphase insulating paper may have a shape in which legs are provided on one body portion, and the interphase insulating paper having the above shape may be attached to both ends of the stator core 21 with tape or the like.

In addition, although the configuration example of a three-phase alternating current motor has been described in the above embodiment, the interphase insulating paper 10 of the present invention can be widely applied to the insulation of coils in the stator of multi-phase rotating electric machines. For example, the interphase insulating paper 10 of the present embodiment may be applied to insulation of coils in a stator of a three-phase AC generator. Further, the rotary electric machine is not limited to a three-phase alternating current, and may be configured for, for example, a two-phase alternating current or a five-phase alternating current.

In addition, the embodiments disclosed this time should be considered in all respects to be illustrative and not restrictive. The scope of the present invention is indicated by the scope of the claims rather than the above description, and is intended to include all modifications within the scope and meaning of equivalents to the scope of the claims.

DESCRIPTION OF SYMBOLS 1... Rotary electric machine 2... Stator 3... Rotor 10... Interphase insulating paper 11... Main-body part 11a... One end side part 11b... The other end side part 11c... Center surface part 11d... Turning point 12... Hole Section 13 Legs 21 Stator core 22u, 22v, 22w Coils

Claims (4)

An interphase insulating paper for insulating between radially adjacent coils of different phases of a stator core of a rotating electric machine,
legs inserted into slots of the stator core;
a body portion connected to the leg portion and disposed so as to protrude from the end face of the stator core to insulate the coil end portion of the coil between phases;
The main body portion includes a one-end side surface portion located closer to one end in the circumferential direction of the stator core, the other-end side surface portion located closer to the other-side end portion of the stator core, and the one-end side-surface portion and the other-end side-surface portion. a center surface portion positioned between and partially folded in the direction of the one end side portion so as to abut on one surface of the one end side portion;
An interphase insulating paper in which a hole is formed in the center surface portion at a position overlapping at least one of the folded one surface of the center surface portion and the one end side surface portion. 2. The interphase insulating paper according to claim 1, wherein the hole is formed so as to partially overlap with a vertex of the folded central surface. A pair of the main body portions are provided so as to protrude from both end surfaces of the stator core,
The leg connects the pair of main bodies,
3. The interphase insulating paper according to claim 1, wherein the holes are formed in the center surface of each body. a stator core;
multi-phase coils arranged adjacent to each other in the radial direction of the stator core;
The interphase insulating paper according to any one of claims 1 to 3, which is arranged in plurality along the circumferential direction of the stator core and insulates between different phase coils;
A rotating electric machine.

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