JPH0742208Y2 - Motor interphase insulator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an interphase (interlayer) insulator for insulating between coils of different phases of an electric motor.

[Prior art]

The interphase insulator of an electric motor is generally formed by punching a thin plate material such as polyester film, for example
It is configured as disclosed in Japanese Patent Publication No. 6 and the like. As shown in FIG. 5, this is a pair of coil end insulating parts 40, 41 formed in strips for insulating between different phases of annular coil ends projecting axially from the stator core of the electric motor.
And a plurality of connecting legs 50, 51, 52, 53 for connecting the pair of coil end insulating portions. The connecting legs 50 to 53 are omitted if there is no risk of the coil end insulating parts 40 and 41 protruding axially outward from the inserted coil ends.

When assembling the stator of the electric motor, after inserting the outer layer coil into the iron core and performing shaping for expanding the coil end in the outer diameter direction, a plurality of connecting legs 50 of the interphase insulator 31 are formed.
By inserting ~ 53 into a predetermined slot, the pair of coil end insulating parts 40, 41 are arranged along the inner circumference of the coil end of the outer layer coil, and then the middle layer coil is inserted and the coil is inserted. Coil end insulation of interphase insulator 40,4
Place on the inner circumference of 1. The same procedure is followed to shape the middle layer coil, insert the interphase insulator that insulates the middle and inner layer coils, and insert the inner layer coil, respectively, and place the interphase insulator between the coil ends of the three layers of coils. To be done.
In the case of an electric motor in which the coils are arranged in two layers, the interphase insulators that insulate the middle layer coil and the middle and inner layer coils from each other are omitted. An interphase insulator is arranged between the coil ends of the coil.

Generally, when the number of interphase insulators used is large, the interphase insulation of an electric motor increases the ratio of wrapping between adjacent coil end insulation parts, increasing the cost of the material. If you try to do so, the coil end insulating part will not be easily deformed along the radial irregularities of the coil end, and the connecting leg once inserted into the slot will move out of the slot while inserting other connecting legs. Since it pops out, it is difficult to handle. Therefore, in general, it is desirable that the circumference of the annular coil end is insulated by two interphase insulators from the viewpoint of material and workability.

[Problems to be solved by the device]

In the conventional interphase insulator 31 shown in FIG. 5, the coil end insulating portions 40 and 41 have a constant band width. However, the projecting height of the coil end projecting from the stator core to both sides in the axial direction has many undulations and generally does not match the band width of the coil end insulating portion. Therefore, after inserting all the coils, the excess insulating paper protruding from the coil ends is cut with scissors to facilitate the lacing in the post-process, and the shape of the coil ends can be made compact.

This extra work of cutting off the insulating paper not only requires a great number of man-hours, but also may accidentally damage the coil with scissors during the work, which may cause hayashiyoto, which is preferable in terms of the quality of the electric motor. It wasn't something.

[Means for Solving the Problems]

According to the present invention, the coil end insulating portion of the interphase insulator is arranged such that its substantially central portion in the circumferential direction is located at the interelectrode portion of the coil on the outer layer side, and the band width of the coil end insulating portion is substantially equal to the circumferential direction. A wide portion and a narrow portion are different from each other with the central portion as a boundary.

[Action]

By arranging the narrow width portion of the coil end insulating portion formed by the wide width portion and the narrow width portion at a portion where the coil amount is small, the coil end insulating portion does not significantly protrude from the coil end.

〔Example〕

FIG. 1 shows an interphase insulator 32 according to the present invention, which is formed by punching out an insulating thin plate material such as a polyester film. The interphase insulator 32 includes a pair of coil end insulating portions 42 and 43 formed in a strip shape for insulating between different phases of coil ends projecting axially from the stator core of the motor, and the pair of coil end insulating parts. A plurality of connecting legs 50, 51, 5 for connecting the parts 42, 43 to prevent them from jumping out from the coil end
It consists of 2,53. The coil end insulating portions 42, 43 are composed of wide width portions 44, 45 and narrow width portions 46, 47 with the substantially central portion as a boundary.

FIG. 2 is a diagram schematically illustrating a coil end portion in order to explain a state of inserting the interphase insulator 32 into a motor stator, and in the embodiment of FIG. 2, FIG. The interphase insulator 32 shown in (3) is used for insulation between the outer layer coil 61 and the middle layer coil 62 of the three-phase coil.

In FIG. 2, 60 is a substantially cylindrical iron core, and
Reference numeral 24 denotes semi-closed slots provided in the inner diameter portion of the iron core 60 at equal intervals with openings parallel to each other. 61,62,
Reference numeral 63 is a concentric winding coil inserted into the slots 1 to 24 of the iron core 60 via ground insulation, and the coil pieces are stored in the slots marked with circles. I.e. slot 1
To 12 and 2 to 11 coil strips with outer coil
One pole of 61 is formed, and another pole of the outer layer coil 61 is formed by the coil pieces extending from the slots 13 to 24 and 14 to 23. Similarly, the middle layer coil 62 is formed by the coil pieces extending from the slots 9 to 20 and 10 to 19 and the coil pieces extending from the slots 21 to 8 and 22 to 7, and the coil pieces extending from the slots 17 to 4 and 18 to 3. , Slots 5 to 16
And the coil pieces extending from 6 to 15 form an inner layer coil 63, and the coils 61, 62, 63 are each displaced by 120 ° in electrical angle to form a three-phase two-pole coil.

In the assembly of the electric motor, the outer layer coil 61 is inserted into the iron core 60, and after the coil shaping for expanding the coil end of the outer layer coil 61 in the outer diameter direction, the two interphase insulators 32, 32 is attached to the iron core 60. At this time, one of the interphase insulators 32 has four connecting legs 50, 51, 5 shown by black dots in the figure.
Positioning is performed by inserting 2, 63 into slots 18, 15, 10, and 7, respectively, and similarly the other interphase insulator 32
Also has four connecting legs 50, 51, 52, 53 in slots 6, 3, 2 respectively.
Positioning is made by inserting the coil into the outer layers of the outer layer coil 61 so that the end portions of the coil end insulating portions 42, 42 (43, 43 on the opposite side coil end) are wrapped around the pole center portion of the outer layer coil 61. It is arranged along the inner circumference of the coil 61.

Thereafter, the middle-layer coil 62 is inserted and the coil end thereof is arranged on the inner circumference of the coil end insulating portions 42, 43 of the interphase insulator 32. Similar to the outer layer coil 61, coil shaping is performed on the middle layer coil 62 to expand the coil end in the outer diameter direction.However, since the outer layer coil 61 is already present on the outer peripheral portion, the outer layer coil 61 is formed. It is shaped so that it rides up to and is axially high. Subsequently, the interphase insulator 33 that insulates the inner layer coils from each other is inserted, and finally the inner layer coil 63 is inserted to complete the insertion of the coils.

In FIG. 2, the coil end insulating parts 42, 42 of the interphase insulators 32, 32 for insulating between the outer and middle layer coils are arranged such that the central portion in the circumferential direction is located in the interelectrode parts 64, 64 of the outer layer coils 61, 61. And iron core
A wide portion 44 (wide portion 45 on the opposite coil end) is located on the left side of the inner diameter side of 60, and a narrow portion 46 (narrow portion 47 on the opposite coil end) is located on the right side. . This is because the coil end is formed high on the left side because there is the pole center of the middle layer coil 62,62, and the coil end is formed low on the right side because there are interpole portions 65,65 of the middle layer coils 62,62. Because it is done. This relationship is illustrated in FIG. 3, and in the interpolar portion 65 of the middle-layer coil 62, the coil is branched and the rising portion of the coil is laid down toward the center of both poles. Therefore, the coil amount of the middle layer coil 62 near the pole gap portion 65 is smaller than that in the pole center portion, and the height of the coil end is low. Therefore, the coil end insulation part of the interphase insulator 32
Since the narrow width portion 46 of the portion 42 insulates the outside and the middle layer coil from this portion, the coil end insulating portion 42 does not extremely project from the coil end.

Next, the interphase insulator 32 shown in FIG. 1 can be applied to an electric motor in which coils are arranged in two layers.
The figure schematically shows the coil end portion when the coils are arranged in two layers on the motor stator. The interphase insulators 32a and 32b applied to FIG. 4 are different in dimension from those applied to FIG. 2, but the structural features are the same, so for simplification, the corresponding parts are omitted. Is the interphase insulator in Fig. 1
The same reference numeral as 32 will be given to the description.

In FIG. 4, 1 to 30 are slots, and 66 and
67 is a coil that is displaced by 90 ° in electrical angle and inserted into the iron core 69. For example, a single-phase 2 coil including a main coil and an auxiliary coil.
A pole concentric coil is shown. In this case, since the number of slots per pole is odd, outer pole coils 66 and 67 have a pole portion at the positions of slot 1 and slot 16. Therefore, the coil pieces extending from the slots 1 to 16 across both poles are
The coil ends of the two coils 66 and 67 are configured to cross the side of 66. Then, the coil pieces extending from the slots 2 to 15, 3 to 14, 4 to 13 and 5 to 12 form the outer layer coil 66 of one pole, and similarly from the slot 17
The outer layer coil 67 of the other pole is formed by the coil pieces extending from 30, 18 to 29, 19 to 28, and 20 to 27. Therefore, since the coil end of the outer layer coil 66 is composed of five coil pieces, the coil amount is increased and the height of the coil end is increased, while the coil end of the outer layer coil 67 is composed of four coil pieces. Therefore, since the amount of coil is small, the height of the coil end is low. Slots 9 to 23, 10 to 22, 11 to 21, 12 to 20,
One pole of the inner layer coil 68 is formed by the coil pieces extending from 13 to 19 and 14 to 18, and slots 24 to 8 and 25 to 7,
Another piece of inner layer coil 68 is formed by coil pieces extending from 26 to 6, 27 to 5, 28 to 4 and 29 to 3.

The coil end insulating parts 42, 42 of the interphase insulators 32a, 32b (43, 43 at the opposite coil end) are the outer layer coils 66, 67.
Is inserted between the inner layer coil 68 and the inner layer coil 68, and the boundary between the wide width portions 44, 45 and the narrow width portions 46, 47 is the branch portion of the outer layer coil, that is, between the slots 30 and 1 and between the slots 16 and 17. Of the outer layer coils 66 and 67, and the ends thereof are arranged so as to wrap at the pole centers of the outer layer coils 66 and 67. When disposing the coil end insulating portions 42, 42, the wide portions 44, 44 (45, 45 on the opposite side coil end) are arranged along the inner circumference of the coil end of the outer layer coil 66 on the higher coil end side. ,
That is, narrow portion 46,46 (47,4 at the opposite coil end)
7) is arranged along the inner circumference of the coil end of the outer layer coil 67 on the lower side of the coil end. Therefore, in FIG. 4, the interphase insulators 32a and 32b have the same shape, but the interphase insulator 32b is inserted inside out of the interphase insulator 32a. As a result, the coil end of the outer layer coil 66 composed of the five coil pieces having the larger coil quantity is insulated by the wide portions 44, 44, and conversely, the outer layer coil composed of the four coil pieces having the smaller coil quantity. The coil ends of 67 are insulated by the narrow width portions 46, 46, and the coil end insulating portions 42, 42 do not project extremely from the coil ends.

Also, since the coil end of the outer layer coil 66 has a longer circumference than the coil end of the outer layer coil 67, the interphase insulator 32
The wide width portions 44 and 45 in a and 32b are configured to have a longer circumferential length than the narrow width portions 46 and 47. However, interphase insulators 32a, 32b
May be arranged so that the boundary between the wide width portions 44, 45 and the narrow width portions 46, 47 is located between the poles of the outer layer coil, that is, the positions of the slots 1 and 16. In this case, the wide width portions 44, 45 and the narrow portions 46 and 47 are configured to have substantially the same length.

[Effect of device]

ADVANTAGE OF THE INVENTION According to this invention, according to the height of the protrusion of the coil end which protrudes to both sides of the axial direction from the stator core of an electric motor, the wide part and narrow part in the coil end insulation part of an interphase insulator respond | correspond to this height. Since the insulating paper portions that are extremely protruded from the coil ends are eliminated, as a result, the work of cutting the insulating paper becomes unnecessary, and the number of work steps is reduced.
In addition, the damage to the coil that occurs during the cutting work is eliminated, and the quality of the electric motor can be improved.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention, FIG. 1 is a plan view of an interphase insulator, FIGS. 2 and 4 are schematic views of coil ends showing different examples, and FIG. FIG. 5 is a perspective view of a main part of the coil end, and FIG. 5 is a plan view of an interphase insulator showing a conventional example. 1-30 …… slot, 31,32,33 …… interphase insulator, 40,41,
42,43 …… Coil end insulation, 44,45 …… Wide width of coil end insulation, 46,47 …… Narrow width of coil end insulation.

Claims (1)

[Scope of utility model registration request] 1. An interphase insulator of an electric motor, comprising a strip-shaped insulating portion for insulating between different phases of coil ends, wherein a substantially central portion in the circumferential direction of the strip-shaped insulating portion is located at an interelectrode portion of a coil on the outer layer side. And a band width of the band-shaped insulating part is made different between a wide part and a narrow part with the substantially central part in the circumferential direction as a boundary.