JP2002218718A - Method and apparatus for shortening coil end of motor - Google Patents

Abstract

[PROBLEMS] To minimize the amount of protrusion of a coil end from a stator and to eliminate the need for a lacing operation to bind the coil end, thereby facilitating the shaping of the coil end. SOLUTION: An end portion 3a of a coil 3 accommodated in a coil accommodating groove 1a of a stator 1 is pressurized and compressed by a hand press or the like in the axial direction of the stator 1 and then held by a jig 5. In this state, the coil end 3a is subjected to a varnish treatment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor coil for accommodating a coil extending in an axial direction in a stator and projecting both ends of the coil projecting from both end surfaces of the stator toward the axial direction. The present invention relates to an end shortening method and apparatus.

[0002]

2. Description of the Related Art In a motor required to be miniaturized, for example, an electric vehicle motor, as shown in FIG. 14 (a), a coil housing groove 1 formed in an inner surface of a cylindrical stator 1 is formed.
It is necessary to reduce the amount of protrusion from the stator 1 by shortening the end 3a of the coil 3 accommodated in the stator 1 in the axial direction of the stator 1, that is, in the vertical direction in the figure.

In this case, as shown in FIG. 14 (b), the both ends 3a are pressurized and compressed with a pressing force P by a hand press or the like, so that the amount of protrusion of the end 3a from the stator 1 is determined. 14 (a) can be reduced by the shortening allowance α.

[0004] After pressurizing and compressing, as shown in Fig. 14 (c), in a state where the pressing operation on the coil end 3a is released, the coil end 3a is called "lacing" using glass fiber-containing yarn. Bind and fix, then coil 3
In order to insulate or reinforce the varnish, a varnish treatment as described in, for example, JP-A-6-14503 and JP-A-7-67302 is performed.

[0005]

However, if the pressing operation on the coil end 3a is released before performing the varnish treatment, the threadback is performed, but the springback occurs due to the characteristics of the electric wire constituting the coil 3. 14B, the amount of protrusion of the coil end 3a from the stator 1 is increased by an increase β compared to the state of FIG. Also,
Before the varnish treatment, a complicated thread binding operation for shaping the coil end 3a is necessary, so that the workability is deteriorated, and the dimension of the coil end 3a is further increased by the amount of the bound thread. For wires that deviate only a few from the coil end 3a after pressurization, the wires cannot be sufficiently held down by string binding, and the shaping of the coil end 3a becomes insufficient.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to minimize the amount of protrusion of the coil end from the stator and to simplify the operation of shaping the coil end by eliminating the need for stringing work.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, there is provided an electric power steering apparatus comprising: a coil; In a method for shortening a coil end portion of a motor in which both end portions are shortened in the axial direction, the end portion of the coil is maintained while maintaining a state in which both end portions of the coil are pressurized and compressed in the axial direction of a stator. Varnishing is performed on a coil end of a motor.

According to a second aspect of the present invention, there is provided a motor in which a coil is accommodated extending in an axial direction in a stator and both ends of the coil projecting from both end surfaces of the stator are shortened in the axial direction. In the coil end shortening device, when performing varnish treatment on both ends of the coil, a jig for holding a state in which both ends of the coil are pressed and compressed toward the axial direction of the stator is provided. is there.

According to a third aspect of the present invention, in the configuration of the second aspect of the present invention, the jig is provided at both ends of the coil with an inner holding member for holding the inner circumferential side of the stator and an outer holding member for holding the outer circumferential side of the stator. It is configured to include a member and an end holding member that presses the end of the stator in the axial direction.

According to a fourth aspect of the present invention, in the configuration of the third aspect of the present invention, the end holding member comprises a pair of end holding members that contact both ends of the coil, and each of the end holding members is connected to the coil end portion. And a pair of pressing fixtures that are pressed toward each other and fixed to each other.

According to a fifth aspect of the present invention, in the configuration of the fourth aspect, the pair of pressing fixtures are fastened and fixed to each other at a portion outside the outer peripheral side holding member by screws.

According to a sixth aspect of the present invention, in the configuration of the fifth aspect of the invention, the screw is provided with screw portions in opposite directions at both ends,
Each of the screw portions is screwed into the opposing surfaces of the pair of pressing fixtures and fastened and fixed.

According to a seventh aspect of the present invention, in the configuration of the fifth or sixth aspect, the inner peripheral holding member, the outer peripheral holding member, and the pressing fixture have a varnish passage for supplying varnish to the coil end. Is formed.

According to an eighth aspect of the present invention, in the configuration according to any one of the second to seventh aspects, the jig is made of a fluororesin.

According to a ninth aspect of the present invention, in the configuration according to any one of the third to eighth aspects, between the axial end surface of the stator and the coil end portion, from the outer peripheral side of the stator to the inner peripheral side thereof. A configuration is adopted in which an insertion piece whose plate pressure gradually decreases toward it is inserted.

[0016]

According to the first or second aspect of the present invention, the coil ends are subjected to varnish treatment while maintaining the state where both ends of the coil are pressed and compressed toward the axial direction of the stator. Therefore, when the coil end is fixed by the varnish treatment, the spring back of the coil can be suppressed, the amount of protrusion of the coil end from the stator is reduced, and the size of the motor can be reduced. In addition, since the jig retains the compressed state by the jig, it is not necessary to bind the end of the coil, and the wire can be prevented from deviating from the end of the coil after pressurization.

According to the third aspect of the present invention, the varnish processing can be performed in a state where the inner peripheral side and the outer peripheral side of the coil end and the both ends in the axial direction of the stator are pressed, respectively. And the coil end becomes more compact.

According to the fourth aspect of the present invention, the pair of pressing fixtures are fixed to each other, so that the inner peripheral side and the outer peripheral side of the coil end are pressed by the inner peripheral side holding member and the outer peripheral side holding member, respectively. The end of the coil can be pressed and compressed in the axial direction of the stator via the end holder.

According to the fifth aspect of the present invention, since the pair of pressing fixtures are fastened and fixed to each other at the outer portion of the outer peripheral holding member by screws, the pressing and compressing operation on the coil end portion is easily and reliably performed. It can be carried out.

According to the sixth aspect of the present invention, the screw has screw portions in opposite directions at both ends, and each screw portion is screwed and fastened to the opposing surfaces of the pair of pressing fixtures. Therefore, the fastening operation can be easily performed.

According to the seventh aspect of the present invention, the inner peripheral holding member, the outer peripheral holding member, and the pressing fixture are provided with the varnish passage for supplying varnish to the coil end portion. The varnish can be reliably supplied to the part.

According to the eighth aspect of the present invention, since the jig is made of fluororesin, the removability of the jig from the coil after the varnish treatment is improved.

According to the ninth aspect of the present invention, the insertion piece whose plate pressure gradually decreases from the outer peripheral side to the inner peripheral side of the stator is inserted and arranged on the axial end face of the stator. The portion is pressed against the inner peripheral side of the stator by the inclined surface of the insertion piece, so that the shape of the coil end can be further improved.

[0024]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a working process diagram of a method for shortening a coil end portion according to an embodiment of the present invention. FIG. 1 (a)
14A shows the same state as FIG. 14A shown in the conventional example, that is, a state in which the coil 3 is housed in the coil housing groove 1a of the cylindrical stator 1. FIG. In addition, the above-mentioned stator 1
Is formed by laminating a large number of ring-shaped plate members provided with a large number of concave portions forming the coil accommodating groove 1a on the inner peripheral portion.

As shown in FIG. 14B, both ends 3a are pressed and compressed with a pressing force P (for example, about 60 kN) from the state shown in FIG. The amount of protrusion of the end 3a of the coil 3 is shown in FIG.
Is reduced by the shortening allowance α as compared with the state of.

After releasing the pressurizing and compressing operation by a hand press or the like in FIG. 1B, springback (β) occurs as in FIG. 14C shown in the conventional example, but FIG. As shown in FIG. 1B), the state of pressurized and compressed in FIG.
While holding down and holding with a pressure of about N, the coil end 3
Since the varnish treatment is performed on a, at this time, the springback (β) is pushed back and disappears. At this time, a varnish passage 5a for supplying varnish to the coil end 3a is formed in the jig 5 in advance. After the varnish treatment, when the coil end 3a is fixed, the jig 5 is removed as shown in FIG.

The varnish treatment is performed by the jig 5 using the coil end 3.
a, the spring 3 of the coil 3 after the compression in FIG. 1B is eliminated, and the state shown in FIG. In this state, the amount of protrusion of the coil end portion 3a from the stator 1 can be reduced by the amount of α, thereby reducing the size of the motor because there is no increase β due to the conventional springback shown in FIG. At the same time, the thread binding work on the coil end 3a is also unnecessary since it is held down by the jig 5, and the shaping work becomes easy.

FIG. 2 is a sectional view showing in detail a state in which the coil end 3a is being pressed and compressed by the jig 5. The jig 5 includes a pair of inner peripheral holding rings 7 as inner peripheral holding members that press the inner peripheral side of the stator 1 at both end portions 3a of the coil 3 and a pair of outer peripheral holding members that press the same outer peripheral side. , A pair of end holding rings 11 as end holding tools for holding the end side of the stator 1 in the axial direction (vertical direction in FIG. 2), and the end holding ring 1
And a pair of press-fixing rings 15 as a pair of press-fixing members which are further disposed outside the axial direction and fastened and fixed to each other by screws 13. The end holding ring 11 and the pressing and fixing ring 15 constitute an end holding member.

As shown in FIG. 2, the inner peripheral side holding ring 7, the outer peripheral side holding ring 9, the end holding ring 11, and the pressing and fixing ring 15 have the same shape as shown in FIG. Although a pair of upper and lower parts are used in the description, in the following description, it is assumed that the upper part in FIG. 2 is performed, and the lower part is the same as that of the upper part.
Description is omitted.

FIG. 3 is a bottom view of the pressure fixing ring 15, and FIG.
FIG. 4 is a sectional view taken along line AA of FIG. 3. This press fixing ring 15
The outer ring portion 17 presses the upper end surface of the end holding ring 11, the intermediate ring portion 19 protruding downward in FIG. 4 on the outer peripheral side of the outer ring portion 17, and the intermediate ring portion 1.
9 and an inner ring portion 21 located at a position facing the front end (the lower end in FIG. 4). The intermediate ring portion 19 and the inner ring portion 21 are formed smaller than the outer ring portion 17 so as to have the same outer diameter and the inner diameter located outside the outer peripheral side holding ring 9.

As shown in FIG. 3, the intermediate ring portion 19 and the inner ring portion 21 are connected by a boss portion 23 at 90-degree intervals along the circumferential direction, and the adjacent boss portions 23 Are connected by a connecting post 25 at an intermediate position. Boss portion 23, inner ring portion 21 corresponding to boss portion 23, intermediate ring portion 1
9 is formed with a female screw 27 into which the screw 13 shown in FIG. 2 is screwed. The female screw portion 27 is a mutually opposite screw between the pair of pressing and fixing rings 15, and correspondingly, the male screw portion 13a formed at both ends is different from the oppositely screw. Has become.

The boss 23 has a square cross section, that is, a square prism shape as a whole, and two apexes on a diagonal line of the square correspond to positions in the radial direction of the ring. The connecting pillar 25 has a square pillar having a square cross section, but the apex located at the center of the ring is an acute angle, and the apex located on the opposite side is approximately 90 degrees. ing. The space between the boss 23 and the connecting column 25 serves as a varnish passage 29.

FIG. 5 is a bottom view of the outer peripheral holding ring 9, and FIG. 6 is a sectional view taken along the line BB of FIG. In the outer peripheral side holding ring 9, an outer ring portion 31 located on the outer ring portion 17 side of the pressing and fixing ring 15 and an inner ring portion 33 located on the stator 1 side are formed by the pressing and fixing ring 15 shown in FIG. It is connected by a connecting column 35 similar to the connecting column 25. The connecting columns 35 are provided at eight locations at equal intervals in the circumferential direction. At the time of assembly in FIG. 2, the positions may correspond to the connecting columns 25 and the boss portions 23 of the pressing and fixing ring 15 or may not correspond to the positions. . A varnish passage 37 is formed between the connecting columns 35.

The inner diameter of the outer holding ring 9 is formed slightly larger than the outer diameter of the end holding ring 11 so that the end holding ring 11 can be accommodated in the outer holding ring 9 in close contact therewith. In addition, a cutout portion 39 into which a corner of the outer peripheral edge of the stator 1 is inserted at the time of assembling in FIG. 2 is formed in the inner peripheral edge of the outer peripheral side holding ring 9 on the stator 1 side.

FIG. 7 is a bottom view of the inner peripheral side holding ring 7, and FIG. 8 is a sectional view taken along the line CC of FIG. This inner peripheral side holding ring 7, like the outer peripheral side holding ring 9, has the pressing and fixing ring 1.
Outer ring portion 41 located on the outer ring portion 17 side of No. 5
And the inner ring portion 43 located on the side of the stator 1 is connected to the connecting column 4 similar to the connecting column 25 in the pressing and fixing ring 15.
9 are connected. However, this connecting column 49
Is formed such that the apex portion on the outer side in the radial direction of the ring has an acute angle.

The connecting columns 49 are provided at eight locations at equal intervals in the circumferential direction.
It becomes 1.

The outer diameter of the inner peripheral holding ring 7 is formed to be slightly smaller than the inner diameter of the end holding ring 11 so that the inner peripheral holding ring 7 can be housed in the end holding ring 11 in close contact with it. I have. In addition, a notch 53 into which the corner of the inner peripheral edge of the stator 1 is inserted at the time of assembling in FIG. 2 is formed in the outer peripheral edge of the inner peripheral side holding ring 7 on the stator 1 side.

FIG. 9 is a bottom view of the end holding ring 11.
It is a simple washer-shaped ring member and has a coil end 3a.
Is set at the axial end of the stator 1 (the upper surface of the coil end 3a in FIG. 2).

FIG. 10 shows an insertion piece 55 that is inserted between the upper and lower end surfaces of the stator 1 and the coil end 3a from the outside in the radial direction of the stator 1 in FIG. FIG.
The state where the above-described insertion piece 55 is set on the end face of the stator 1 which is partially shown is shown. The stator 1 is
An annular portion 57 on the outer peripheral side and a projecting portion 59 protruding toward the inner peripheral side of the annular portion 57 are provided, and the coil accommodating groove 1a is formed between the projecting portions 59.

As shown in FIG. 10A, the insertion piece 55 has a base 61 corresponding to the annular portion 57 of the stator 1 and a tip 63 corresponding to the protrusion 59 of the stator 1.
As shown in FIG. 10B, the plate pressure gradually decreases from the base 61 to the tip 63. Such insertion pieces 55 are set corresponding to all the protrusions 59 on the stator 1.

The components of the jig 5 described above, ie, the inner peripheral holding ring 7, the outer peripheral holding ring 9, the end holding ring 11, the pressing and fixing ring 15, and the insertion piece 55
Are made of fluororesin.

Next, a procedure for assembling the jig 5 to the stator 1 in which the coil 3 is accommodated will be described. The jig 5
When assembling, as shown in FIG. 1 (b), it is assumed that the coil end 3a is pre-compressed with a pressure of, for example, about 60 kN by a hand press or the like.

First, the end face of the stator 1 and the coil end 3a
10, the insertion piece 55 shown in FIG. 10 is inserted into the outer peripheral side of the stator 1 from the distal end portion 63 side.
The outer peripheral side holding ring 9 shown in FIG. 5 and FIG. At this time, the outer peripheral side holding ring 9 is in a state where the outer peripheral edge corner of the stator 1 enters the notch 39 and a part of the inner peripheral surface is in contact with the outer peripheral side of the stator at the coil end 3a.

Further, the inner peripheral holding ring 7 shown in FIGS. 7 and 8 is fitted to the inner peripheral side of the stator 1. At this time, the inner peripheral side holding ring 7 is in a state where the inner peripheral edge corner of the stator 1 enters the notch 53 and a part of the outer peripheral surface is in contact with the inner peripheral side of the stator at the coil end 3a.

The outer holding ring 9 and the inner holding ring 7 are assembled to the stator 1 respectively.
Both ends of the stator 1 in the axial direction (vertical direction in FIG. 2) protrude outward from the coil end 3a in the axial direction to form a gap therebetween, and the end holding ring 11 is fitted in the gap. And brought into contact with the outer end of the coil end 3a in the axial direction of the stator. In this state, the axial end of the end holding ring 11 projects further axially outward than the axial end of the outer holding ring 9 and the inner holding ring 7. Has become.

In this state, the pressing and fixing ring 15 shown in FIGS. 3 and 4 is put on from above and below in FIG. At this time, the screw 13 is slightly screwed into the female screw 27 of each pressing and fixing ring 15 in advance, and the center portion of the screw 13 is held and rotated by a tool, so that the externally threaded male screw portions 13a, 13a are mutually screwed. Are screwed into the female screws 27, 27 of the pair of pressing and fixing rings 15, respectively.

When the fastening operation of all the screws 13 is completed so that the projecting amount of the coil end portion 3a from the stator end surface becomes the target value, the outer ring portion 17 of the pressing and fixing ring 15 is completed.
Presses the end holding ring 11 from above and below, and the axial end of the coil end 3a is compressed up and down in FIG. 2 and the inner and outer sides of the stator (in FIG. 2). The left and right sides are pressed by the inner peripheral side holding ring 7 and the outer peripheral side holding ring 9, respectively, and the coil end 3a is shaped.

At this point, the end holding ring 11
As shown in FIG. 2, the end of the outer peripheral side holding ring 9 and the inner peripheral side holding ring 7 protrudes further outward in the axial direction as shown in FIG. The pressing operation of the end holding ring 11 on the coil end 3a is ensured. Further, since the insertion piece 55 is inserted between the end face of the stator 1 and the coil end 3a, the coil end 3a is moved by the inclined surface of the insertion piece 55 by the above-described pressurization and compression work.
And the coil end 3a is shaped more compactly.

FIG. 12 is a front view of an apparatus for performing varnish treatment on the coil end 3a after compressing and shaping the coil end 3a using the jig 5 as shown in FIG. The varnish processing apparatus includes, for example, a varnish dropping portion 65 for dropping a varnish made of, for example, an epoxy resin or an acrylic resin onto the coil end 3a, and a work W before varnish dripping (the jig 5 shown in FIG. 2 is assembled). And a drying unit 67 for performing preheating of the stator 1 and the coil 3) and drying of the workpiece W after the varnish is dropped.

The varnish dropping section 65 rotates around the left-right axis in FIG. 12 while holding the work W, and rotates and drives the work W to advance from the position in FIG. The forward / backward drive unit 69 is provided on the base 70. The rotary drive / retraction drive unit 69 includes a main shaft 71 that is rotated by a motor (not shown).
As shown in detail in FIG. 13, a disk 73 is fixed to the tip of the disk, and expansion pins 75 projecting to the left in FIG. Three are provided. A base end of each of the extension pins 75 is rotatably connected to an outer peripheral portion of the disk 73 so that the distal end can move in a direction approaching and separating from the inner surface of the stator 1.

The auxiliary shaft 79 fastened and fixed to the tip of the main shaft 71 by the screw portion 77 has an expansion disk 81 fixed to the base of the screw portion 77, and the outer peripheral portion of the expansion disk 81 is fixed to the main shaft 7.
A tapered surface 83 having a small diameter on one side is formed. A disk 73 fixed to the main shaft 71 has a sub shaft 79
A cylindrical portion 85 protruding toward the side is provided, and the distal end of the cylindrical portion 85 has an annular groove 8 formed in the expansion disk 81.
7 is inserted.

By screwing the sub shaft 79 to the main shaft 71 with the screw portion 77, the tapered surface 83 of the expansion disk 81 is tightened.
Presses the expansion pin 75 outward, and accordingly the expansion pin 75 is pressed against the inner peripheral surface of the inner peripheral holding ring 7 of the jig 5, and as a result, the workpiece W is held and fixed to the main shaft 71 side. .

On the other hand, as shown in FIG. 12, a nozzle holding bracket 89 is provided above the main shaft 71, and the nozzle holding bracket 89 is provided with two flexible varnish dropping nozzles 91 and 93, respectively. Installed. The varnish dropping nozzle 91 having a short overall length is capable of directly dropping varnish into the varnish passage 29 of the pressing and fixing ring 15 of the jig 5. The varnish can be dropped directly into the varnish passage 51 of No. 7.

Next, the varnish dripping operation on the coil end 3a will be described. First, the work W is moved leftward from the state shown in FIG. 12 to enter the drying unit 67 by the rotation drive / retreat drive unit 69, and the work W is preheated while rotating the main shaft 71. After preheating, the spindle 7
1 is retracted to the state shown in FIG. In this state, the varnish dripping nozzles 91 and 93 are manually positioned so as to be at the position indicated by the two-dot chain line in FIG.

In this state, the varnish is dropped from the varnish dropping nozzles 91 and 93 for about 30 to 40 minutes while rotating the main shaft 71 at, for example, about 20 rpm. Thereby, the varnish is supplied to the stator outer peripheral side of the coil end portion 3a through the varnish passages 29 and 37 of the pressing and fixing ring 15 and the outer peripheral side holding ring 9, and the varnish passage 51 of the inner peripheral side holding ring 7 is formed. Then, it is supplied to the inner circumferential side of the stator at the coil end 3a. Work W is placed on coil end 3a.
While rotating the varnish, the varnish is dripped from the outside and the inside, respectively, so that the varnish treatment for the coil end 3a is reliably performed.

When the varnish dripping is completed, the varnish dripping nozzles 91 and 93 are returned to their original positions.
In this embodiment, the varnish dripping nozzles 91, 9
Although the example in which 3 is moved manually is shown, the nozzle holding bracket 89 may be moved by an actuator without performing the manual operation.

Thereafter, the work W is advanced again to enter the drying section 67, and is dried at, for example, 150 ° C. for about 2 to 3 hours. In this embodiment, as an example, the main shaft 71 is advanced by an actuator (not shown) in the rotary drive / retraction drive unit 69 to cause the workpiece W to enter the drying unit 67. Drying section 67
May be moved to the work W side. Further, a drying unit 67 may be separately provided, and the work W may be taken out from the main shaft 71 and dried as appropriate.

As a result, the varnish dropped onto the coil end 3a and impregnated almost entirely is fixed in a state where it is compressed and shaped by the jig 5, and as shown in FIG.
The spring back of the coil 3 is eliminated, and the amount of protrusion of the coil end 3a from the stator end face is reduced by α,
The downsizing of the motor can be achieved.

[Brief description of the drawings]

FIG. 1 is a work process diagram of a coil end shortening method showing an embodiment of the present invention, wherein (a) shows a state in which a coil is housed in a stator, (b) shows a state in which a coil end is pressed,
(C) is a state in which the work is pressed by the jig, (d)
Indicates a state in which the jig is removed.

FIG. 2 is a cross-sectional view showing a state where a coil end is pressed and held by a jig used in the coil end shortening method of FIG. 1;

FIG. 3 is a bottom view of a pressing and fixing ring used in the jig of FIG. 2;

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a bottom view of an outer peripheral holding ring used in the jig of FIG. 2;

FIG. 6 is a sectional view taken along line BB of FIG. 5;

FIG. 7 is a bottom view of an inner peripheral holding ring used in the jig of FIG. 2;

FIG. 8 is a sectional view taken along the line CC of FIG. 7;

FIG. 9 is a bottom view of an end holding ring used in the jig of FIG. 2;

10A is a plan view of an insert used in the jig of FIG. 2, and FIG. 10B is a side view of the insert.

FIG. 11 is a partial explanatory view showing an example of mounting the insertion piece of FIG. 10 on a stator.

FIG. 12 is a front view of an apparatus for performing varnish processing on a coil end.

FIG. 13 is a sectional view showing a main part of the apparatus of FIG.

14A and 14B are work process diagrams of a coil end shortening method showing a conventional example, in which FIG. 14A shows a state in which a coil is housed in a stator,
(B) shows a state in which the coil end is pressed, and (c) shows a state in which the pressing operation is released.

[Description of Signs] 1 Stator 3 Coil 3a Coil end 5 Jig 7 Inner circumference holding ring (inner circumference holding member) 9 Outer circumference holding ring (outer circumference holding member) 11 End holding ring (end holding tool) , End holding member) 13 screw 13a male screw portion 15 press fixing ring (press fixing tool, end holding member) 29, 37, 51 varnish passage 55 insertion piece

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5H604 AA05 AA08 BB01 BB08 BB14 CC01 CC05 CC14 DA14 DA15 DB02 PB01 PB03 5H615 AA01 BB01 BB05 BB14 PP01 PP06 PP13 PP14 QQ02 QQ19 RR07 SS03 SS10 SS20 SS42 TT26 TT31 TT

Claims (9)

[Claims] 1. A method of shortening a coil end portion of a motor in which a coil is extended and accommodated in an axial direction in a stator and both ends of the coil protruding from both end surfaces of the stator are shortened in the axial direction. 3. A method of shortening a coil end portion of a motor according to claim 1, wherein a varnish process is performed on an end portion of the coil while maintaining a state where both ends of the coil are pressed and compressed toward the axial direction of the stator. 2. A coil end shortening device for a motor in which a coil is accommodated extending in an axial direction in a stator and both ends of the coil protruding from both end surfaces of the stator are shortened in the axial direction. Wherein the varnish treatment is performed on both ends of the coil, a jig for holding a state in which both ends of the coil are pressurized and compressed toward the axial direction of the stator, Coil end shortening device. 3. A jig includes an inner holding member for holding the inner circumferential side of the stator, an outer holding member for holding the outer circumferential side of the stator, and an end for holding an end portion in the axial direction of the stator at both ends of the coil. The coil end shortening device for a motor according to claim 2, further comprising a part holding member. 4. An end holding member comprising: a pair of end holders in contact with both ends of a coil; and a pair of pressing members fixed to each other by pressing the end holders toward the coil ends. 4. The coil end shortening device for a motor according to claim 3, further comprising a fixing tool. 5. The coil end shortening device for a motor according to claim 4, wherein the pair of pressing fixtures are fastened and fixed to each other at a portion outside the outer peripheral side holding member by screws. 6. The screw is provided with screw portions in opposite directions at both ends, and each of the screw portions is screwed and fastened and fixed to the opposing surfaces of a pair of pressing fixtures. A coil end shortening device for a motor according to claim 5. 7. A varnish passage for supplying varnish to a coil end is formed in the inner peripheral holding member, the outer peripheral holding member, and the pressing fixture.
Or a coil end shortening device for a motor according to 6. 8. The coil end shortening device for a motor according to claim 2, wherein the jig is made of a fluororesin. 9. An insert piece whose plate pressure gradually decreases from the outer peripheral side of the stator toward the inner peripheral side thereof is inserted between the axial end face of the stator and the coil end. The coil end shortening device for a motor according to any one of claims 3 to 8.