JPS5932335A - Rotary electric machine - Google Patents

Abstract

PURPOSE:To make the varnish processing of a coil smooth and adhesion of varnish thereto uniform by forming openings at the ends of the inner cylinder and outer cylinder of insulation covers enveloping the ends of the coil respectively. CONSTITUTION:Openings 41, 42 are formed at the edge between the inner cylinder and outer cylinder of insulation covers 29, 30 enveloping the ends of a coil. In coating varnish on the coil, the coil is immersed in a varnish tank with one insulation cover 29 faced upward. With this, varnish penetrates into insulation covers 29, 30 through the hole 42 and gaps 37, 38. At this time, air inside the insulation cover 29 is discharged outside through the hole 41 and the whole of a coil 28 is immersed in varnish without generating an air pool. On the one hand, as a stator core 27 is pulled up from the varnish tank, all surplus varnish drips down into the varnish tank through the hole 42 of the insulation cover 30 and throughout all stages, varnish adheres to the coil 28 uniformly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a rotating electric machine with an improved coil insulation treatment structure.

[Technical background of the invention]

Conventionally, for example, in electric motors, the stator core has a
There is one in which the coil end portion of the coil housed in the coil is covered with an insulating cover.

The advantages of this are 1) the coil end can be compressed by the insulating cover and can be lowered, and the second is that the coil end can be reliably insulated and the coil end may come into contact with the rotor or frame etc. and cause wire breakage. Thirdly, there is no need to separately mold the coil end, and it is possible to prevent wire breakage, layer shorts, etc. caused by separate molding as much as possible. Therefore, in the above conventional method 6, the entire stator including the coil ends is immersed in a varnish bath with the coil ends covered with an insulating cover, and then pulled out and dried. 1. = CI8 edge processing was performed.

[Problems with background technology]

However, in the above-mentioned conventional method, when the stator with the coil end covered with the insulating cover is immersed in the varnish bath, the laminated surface of the stator core is kept horizontal, that is, one insulating cover is upward and the other insulating cover is immersed in the varnish bath. If the cover is immersed in a varnish tank with the cover positioned downward, the air inside the upper insulating cover will not be exhausted and an air pocket will be created within the insulating cover, and the coil located within this air pocket will be immersed in the varnish tank. It will not be immersed in the water. Also, when the varnish is pulled out of the varnish tank, the varnish stored in the lower insulating cover remains in the insulating cover, and the varnish adheres to the lower coil end thicker than the other parts of the coil and dries. There was a problem that it took a long time.

On the other hand, if the stator is immersed in the varnish tank with the laminated surface of the stator core perpendicular and the insulating covers are positioned on the left and right sides, the air inside the insulating cover will flow between the insulating cover and the stator core. As a result, the coil is immersed uniformly in the varnish, and when pulled up, excess varnish is completely removed from the contact surface between the insulating cover and the stator core. D1
After all, the varnish adheres uniformly to the coils, providing good insulation and shortening the drying time. 0, it contacts the rotor and controls its rotation.
There was a problem in that it appeared to be harmful.

On the other hand, if the laminated surface of the stator core is leveled and dipped in varnish without the insulating cover attached, and then the insulating cover is attached after drying, the insulation of the coil will be good, the drying time will be short, and the inside of the stator core will be The varnish is evenly applied to the circumferential surface and there is no contact with the outer circumferential surface of the rotor, but on the other hand, the copper wire after varnish treatment becomes easily bent due to the effect of the varnish, so when installing the insulating cover, Since the coil was compressed by 1, there was a problem that the wire would break at that time. Furthermore, since the coil end is covered with an insulating cover as a whole, there is a problem in that heat radiation is poor and when the motor is operated, the temperature of the coil becomes high due to the heat generated by the coil.

[Purpose of the invention]

The present invention was made in view of the above points, and in short, in addition to ensuring insulation throughout the coil, shortening drying time, and ensuring smooth rotation of the rotor,
The purpose is to provide a rotating electrical machine that can reliably prevent coil disconnection and provide good heat dissipation.

[Summary of the invention]

The present invention is characterized in that an opening is provided in the end face between the inner cylindrical part and the outer cylindrical part of the insulating cover that covers the coil end.

(Example of the invention) An embodiment of the present invention will be described below with reference to the drawings.

First, in FIGS. 1 and 2, 1 is a front frame, 2 is a rear frame, both of which are formed in a short cylindrical shape with a bottom, and a tapered support portion 3° 4 is formed in the center. Flanges 5 and 6 are provided at the edge of the opening, and these flanges 5 and 6 are brought into contact and secured by rivets 7. 8 and 9 are holes as first openings provided on the sides of the front frame 1 and the rear frame 2 (lF), and 11 is a hole located inward (center side) from the holes 8 and 9. A plurality of holes 12.13 are provided as second openings in the area where the holes 10 and 11 are formed, and are rectangular notches formed continuously outside of the holes 10 and 11. 14. ．． 1
Reference numeral 5 denotes a bearing, the outer periphery of one end of which is brought into contact with the support portions 3.4 of the front frame 1 and the rear frame 2, respectively. 16
17 is an oil pan having step parts 16a and 17a, and the claws 16b and 17b at the tips thereof are inserted into the notch 12 of the front frame 1.
and the front frame 1 by penetrating them into the notches 13 of the rear frame 2 and bending their tips. The rear frame 2 is caulked (pulled), and the stepped portions 16a of the oil pans 16, 17,
A presser plate 18.19 made of a leaf spring is supported on 17a, and the center portion of the presser plate 18.19 presses the outer peripheral surface of the other end of the bearing II, 15. 20.21 is an oil-impregnated member, which is in contact with the outer peripheral surface of the bearing 14.15. 22 is a rotor with a rotor core 23 housing a squirrel cage conductor (not shown) and a bearing 1 which is press-fitted into this rotor core 23.
Consisting of shirts 1 to 24 supported by 4.15,
An end ring 25 is cast on the end face of the rotor core 23, and a plurality of fan blades 26 are cast on the end portion of the end ring 25.

Now, 27 is a stator core fitted to the front frame 1 and the rear frame 2, and is formed by laminating silicon steel plates, and the coil 2B is housed in the slot thereof. 29 and 30
is an insulating cover for covering the coil ends 288.28b of the coil 28 protruding from both sides of the stator core 27, which is integrally formed with an insulating material such as plastic, as shown in FIGS. 3 and 4. They each have an inner cylindrical portion 31, 32, an outer cylindrical portion 33, 34, and an end face 35, 36 between the two cylindrical portions.

The inner cylindrical portions 31 and 32 are formed into a cylindrical shape with a diameter slightly larger than the inner diameter of the inner peripheral portion 27a of the stator core 27. A gap 37,38 is present. Further, the outer cylindrical portion 33.34 has flat surface portions 33a, 34.8 formed on the outer peripheral surface so as to match the outer shape of the stator core 27, and is formed into a substantially rectangular cylindrical shape.
An engaging claw 39 is integrally provided on the flat surface portion 33a of the outer cylindrical portion 33 of No. 9, and the flat portion 3 of the outer cylindrical portion 34 of the other insulating cover 30
4a, a rod-shaped engaging piece 40 corresponding to the engaging claw 39 is also integrally stepped c. 41.42 is the above insulation cover 2
This hole serves as an opening provided in the end face portion 35.36 of the frame 9, and the hole ε3 of the front frame 1 and the hole 9 of the rear frame 2 are opposed to this hole 41.42.

The insulating cover 29.30 having the above-mentioned structure covers the =1 end 28a, 28b of the tile 28 in its entirety, and the end face portion 35. :1(l's introversion'c:Iilendo 28a,
28b is compressed to engage the engaging claw 39 and the engaging piece 40, thereby connecting the insulating covers 29 and 30.

Next, the operation of the above configuration will be explained.

First, to explain the varnish treatment, as mentioned above, the coil ends 28a and 28b of the coil 28 are covered with the insulating cover 29.
．． 30 is gradually lowered into a varnish bath (not shown) with its laminated surface horizontal, that is, with one insulating cover 29 facing upward and the other insulating cover 30 facing downward. Then the varnish is insulated cover 3
0 through the hole 42 and gaps 37, 38 etc.
Penetrates within 9°30. At this time, the upper insulation cover 29
The air inside is discharged to the outside through the holes 41, so that no air pockets are generated in the insulating cover 29 as in the conventional case, and the coil 28 is entirely immersed in the varnish. On the other hand, when the stator core 27 is pulled up from the varnish tank, all of the excess varnish drips into the varnish tank through the holes 42 of the insulating cover 30, so that the coil 28 is uniformly coated with varnish.

Further, the excess varnish adhering to the inner circumferential surface 27a of the stator core 27 gradually flows downward and drips into the varnish tank from the lower end surface of the stator core 27, so that the varnish is evenly adhered to the inner circumferential surface 27a. Therefore, after this = 9- better insulation can be obtained by drying, and
The drying can also be done uniformly throughout and in a short time.

Next, to explain the operation when used as an electric motor, in FIG. 2, when a power switch (not shown) is opened, the coil 28 is energized and the rotor 22 is rotated. The rotation of the rotor 22 causes the fan blades 26 to generate wind, which is blown onto the coil ends 28a, 28b of the coil 28 through the gaps 37, 38, and then, as shown by arrow A, through the insulating cover 29. 30 holes 41
, 42, and then through the holes 8 of the front frame 1 and the holes 9 of the rear frame 2, and is discharged to the outside of the machine. On the other hand, from outside the machine, the holes 10 in the front frame 1 and the holes 11 in the rear frame 2 are visible.
Air flows in through the opening, thereby forming a circulation path shown by arrow A and providing ventilation.

As described above, according to this embodiment, the varnish 51 of the coil 28
! In this process, the insulating covers 29 and 30 covering the coil ends 28a and 28b are immersed in a varnish bath with the upper and lower insulating covers 29 and 30 arranged above and below, respectively, so that the air in the upper insulating cover 29 is discharged from the hole 41. The coil end 28a can be uniformly immersed in the varnish without forming air pockets, and the varnish inside the lower insulating cover 30 can also drip from the hole 42, so that a uniform varnish coating can be formed on the coil 28. Therefore, good insulation properties can be obtained and drying can be performed in a short time. At this time, stator core 27
Since the inner peripheral part 27a of the inner peripheral part 27a is held in a vertical state, the inner peripheral part 27a
The surplus of the varnish adhering to a flows downward and drips into the varnish tank from the lower end surface, and the varnish adhering to the inner circumference becomes uniform and does not come into contact with the outer circumference of the rotor 22. Furthermore, since the above-mentioned varnish treatment is performed with the insulating covers 29 and 30 attached, there is no deformation of the coil ends 28a and 28b of the coil 28 after the treatment, and no external force is applied. No need to worry.

Further, since the amount of heat generated by energizing the coil 28 is radiated through the holes 41, 42 of the insulating cover 29, 30, the heat radiating property is better than in the past, and the temperature rise can be suppressed to a low level. In particular, according to the embodiment described above, there is a gap 37.38 between the end surface of the inner cylindrical portion 31.32 of the insulating cover 29.30 and the end surface of the stator core 27.
Varnish can easily penetrate into the insulation cover 20.30,
As a result, the time for the varnish dipping process can be shortened and productivity can be increased. Further, the hole 8 of the front frame 1 faces the hole 41 of the insulating cover 29, the hole 9 of the rear frame 2 faces the hole 42 of the insulating cover 30, and furthermore, [1-22 has a fan grade 26]. Therefore, as the fan blades 26 rotate with the rotor 22, air from outside the machine is sucked in, and air is discharged outside the machine through the coil ends 28a and 28b (near J). Therefore, the heat dissipation performance can be further enhanced and the temperature rise can be further suppressed.In addition, the holes 10 and 11, which are one of the openings of the front frame 1 and the rear frame 2, are holes for caulking the hl+rests 16 and 17. Since there is no need to make extra holes, it is effective in reducing costs such as cutting mold manufacturing costs.

It should be noted that the present invention is not limited to the embodiment 17), and various modifications can be made without departing from the spirit of the invention.

〔Effect of the invention〕

As described above, the present invention is characterized in that an opening is provided in the end face between the inner cylinder part and the outer cylinder part of the insulating cover that covers the coil end, so that during varnish treatment, Since the varnish can be uniformly permeated throughout the coil and a uniform varnish film can be produced, good insulation can be ensured over the entire coil, and drying time can be shortened. It is possible to provide a rotating electrical machine that has various remarkable effects, such as not causing any situation that would impede the operation of the coil, and further improving the heat dissipation of the coil by reliably preventing disconnection of the coil. .

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention. Figure 1 is a front view of the whole, Figure 2 is a sectional view taken along the line ■-■ in Figure 1, and Figure 3 is a front view of the whole.
The figure is a perspective view of the stator core portion, and FIG. 4 is a cutaway side view of the same. 13- In the figure, 1 is the front frame, 2 (rear frame, 8.9°10
and 11 are holes (openings), 26 are fan blades, 27 are stator plates 17.2B and 28a, 28b are ]Ile and =Ieton, 29.30I are insulating covers, 31.3
24 is an inner cylinder part, 33.34 is an outer cylinder part, 35.36 is an end face part, 37.38 is a gap, and 41.42 is a hole (opening part). Applicant Tokyo Shibaura Electric Co., Ltd. 14- Figure 1 Figure 2

Claims (1)

[Claims] 1. A coil end portion of a coil housed in a stator core is covered by an insulating cover having an inner cylindrical portion and an outer cylindrical portion, the inner cylindrical portion and the outer cylindrical portion of the insulating cover. A rotating electric machine characterized in that an opening is provided in an end face between outer cylinder parts. 2. The rotating electric machine according to claim 1, wherein a gap exists between the end of the inner cylindrical portion of the insulating cover and the end surface of the stator core. 3. The frame has openings at a portion facing the opening of the insulating cover and a portion located inward from the opening, and the rotor has a fan blade at an end face portion of the end ring. According to claim 3, one of the openings of the rotating side L4 and the frame according to claim 1 or 2 is provided also as a hole for caulking an oil receiver. rotating electric machine.