JPH0715919A - Dynamo-electric machine - Google Patents

Abstract

PURPOSE:To reduce the abrasion of a brush by vibration and also, improve cooling effect by supporting the support plate of a brush holder with an annular insulating board provided at the partition plate of a collector cover, and cooling the brush holder and a brush by cooling wind circulating axially in the ventilation hole provided in the insulating board. CONSTITUTION:The periphery of an annular insulating board 2 is fixed with a bolt 13A to each partition plate 9B inside a collector cover 1. And, the outside periphery of an annular brush holder 3 is abutted against the inside periphery of this insulating board 2, and a brush holder 4 is fixed to the insulating board 2 with a bolt 13B together with a brush holder plate 3. Moreover, in the brush holder support plate 3, a ventilation hole is made in the position between each brush holder 4 and the next. Hereby, the abrasion is reduced by suppressing the vibration of the brush 4, and also the cooling effect at and around the brush 4 can be improved by the cooling wind circulating in axial direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating electric machine having a brush.

[0002]

2. Description of the Related Art FIG. 4 is a half sectional view showing an example around a brush of a conventional winding type induction motor, and FIG. 5 is a sectional view taken along the line BB of FIG. In FIGS. 4 and 5, a rectangular cylindrical collector cover is provided at the left end of the main body of the wire wound induction motor (not shown).
The right end of 21 is fixed, and the left end of the shaft 7 of the main body of the wire-wound induction motor (not shown) projects in a cantilever shape from the bearing (not shown) at the axis of the collector cover 21.

On the shaft 7, a collector cylinder 11 made of a steel material in a cylindrical shape and having an insulating layer formed on the outer circumference is shrink-fitted from the left side in FIG. 4, and the outer circumference of the collector cylinder 11 has an annular shape for three phases. Collector rings 6 are shrink-fitted in order from the left side at predetermined intervals.

Between these collector rings 6, a pair of insulating collars 26 and insulating flanges 25 between these insulating collars 26 are inserted, respectively, and between these insulating flanges 25 and insulating collars 26 and the collector cylinder. An insulating resin is vacuum-impregnated between 11 and 11 to improve the withstand voltage between phases. A conductor 14 for external connection is connected to each collector ring 6.

The inner circumference of the right side plate 21c of the collector cover 21 is
A counterbore is formed in the central portion, and through holes through which the brush holder studs 22 are inserted are provided at 120 ° intervals in the counterbore. The brush holder stud 22 inserted into this through hole has a flange portion 22a formed at the base of the male screw portion formed at the right end in FIG. 4, and a nut 22b screwed from the right end of the male screw portion, The right end is fixed to the inner surface of the right side plate 21c, and the left end is a free end.

An insulating layer not shown in detail is formed on the outer periphery of the brush holder stud 22, and the brush holder stud 22 having the insulating layer formed thereon has an insulating cylinder 22D and an insulating flange.
24, brush holder support 23, which will be described in detail later, insulating cylinder 22C, insulating flange 24, insulating cylinder 22E, brush holder support 23, insulating cylinder 22B, insulating flange 24, insulating cylinder 22E, brush holder support 23, insulating cylinder 22A, insulating flange 24 are sequentially inserted from the left side and are fixed via a large washer and a nut inserted at the left end of the brush holder stud 22.

Of these, the brush holder support 23 is formed in an annular shape as shown in FIG. 5, flange portions 23a are joined to the outer periphery at 120 ° intervals, and the brush holder stud 22 penetrates the flange portion 23a. .

To the brush holder support 23, brush holders 4 radially arranged as shown in FIG. 5 are fixed from the middle part to the upper part of the left side surface of the brush holder support 23. , Brushes 5 are respectively inserted and attached, and the inner peripheral ends of these brushes 5 are pressed against the outer periphery of the collector ring 6.

In the wound-rotor induction motor constructed as described above, as the shaft 7 rotates, the collector fan 8 attached to the left end of the shaft 7 rotates, so that the cooling air in the interior is indicated by an arrow H in FIG. As shown, the air is discharged to the outside from a vent hole 21a formed on the outer periphery of the left end of the collector cover 21. On the other hand, cooling air is drawn in through the vent hole 21b formed on the outer periphery of the right end of the collector cover 21 as shown by arrow F.

The cooling air sucked through the ventilation holes 21b cools the brush 5, the brush holder 4, the collector ring 6 and the like which are heated by the current flowing from the brush 5 to the collector ring 6, and the brush holder 4 and the brush. The temperature of the insulators such as 5 and the collector ring 6 and the brush holder support 23 around them and the like is suppressed below the specified temperature.

[0011]

However, in the wire-wound induction motor configured as described above, the brush holder stud 22 that supports the brush 5 and the brush holder 4 via the brush holder support 23 has a collector at the right end only. Cover 21
Since it has a cantilever support structure as described above, vibration increases especially on the left side, and not only the abrasion of the brush 5 increases due to this vibration, but also this vibration is transmitted to the shaft 7, The life of the bearing of the shaft 7 may be impaired.

On the other hand, as indicated by arrow F, most of the cooling air sucked into the inside of the collector cover 21 and the inside of the collector cover 21 and the outer periphery of the brush holder support 23 having the flange portion 23a formed on the outer periphery thereof. Partition 29A welded to
Since it flows to the left between 29B as shown by arrows G1 and G2 in FIG. 4, the flow rate of the cooling air flowing around the brush, which is the highest heat generating portion, is reduced, and the cooling effect is reduced.

Therefore, the object of the invention described in claim 1 is to:
An object of the present invention is to obtain a rotating electric machine that can reduce the abrasion of the brush and can enhance the cooling effect.

[0014]

According to a first aspect of the present invention, a partition plate is provided inside the collector cover, and the brush holder is arranged on the outer periphery of the collector ring inserted into the rotating shaft in the collector cover. In the rotating electric machine provided with an annular support plate for supporting the above, the outer periphery is supported by the partition plate, and an annular insulating plate for supporting the outer periphery of the support plate at the inner periphery is provided.

The invention described in claim 2 is the same as claim 1.
In the invention described in (3), the insulating plate is provided with a ventilation hole that allows cooling air inside the collector cover to flow axially therethrough.

[0016]

In the rotating electric machine according to the first aspect, the support plate that supports the brush holder is supported by the insulating plate that is provided in the direction orthogonal to the rotation axis and whose outer periphery is supported by the partition plate.

Further, in the rotating electric machine according to a second aspect of the invention, the support plate for supporting the brush holder is supported by an insulating plate which is provided in a direction orthogonal to the rotating shaft and whose outer periphery is supported by a partition plate, and at the same time, the brush. The holder and the brush supported by the brush holder are cooled by cooling air that axially flows through ventilation holes provided in the insulating plate.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the rotating electric machine of the present invention will be described below with reference to the drawings. FIG. 1 is a half cross-sectional view showing a rotating electric machine of the present invention, which corresponds to FIG. 4 shown in the prior art, and FIG.
FIG. 6 is a cross-sectional view taken along the line AA of FIG. 1 and corresponds to FIG. 5 similarly shown in the related art. 1 and 2 and FIGS. 4 and 5, the shape of the brush holder support 3 that supports the brush holder 4 and the fixing structure thereof are different.

That is, the outer circumference of an annular insulating support plate 2 made of an insulating plate is fixed to each partition 9B provided inside the collector cover 1 by a plurality of bolts 13A. The outer peripheral side of the right side surface of the ring-shaped brush holder support 3 is in contact with the left side surface on the inner peripheral side of these insulating support plates 2.

On the left side surface on the inner peripheral side of the insulating support plate 2,
As shown in FIG. 2, the outer peripheral right side surface of the annular brush holder support 3 is brought into contact with the left side surface of the brush holder support 3.
As shown in FIG. 2, the right side surfaces of the brush holders 4 arranged radially are in contact with each other, and are fixed to the insulating support plate 2 together with the brush holder support 3 by a plurality of bolts 13B. Ventilation holes 12 are formed in the insulating plate 3 at positions between the brush holders 4 as shown in FIG.

In the rotating electric machine constructed as described above, the collector fan 8 rotating with the shaft 7
The air inside the collector cover 1 is discharged to the outside from the left vent hole 1a as in the conventional case, and the cooling air is sucked from the right vent hole 1a as shown by the arrow B. Flows through the ventilation hole 12 formed in each brush holder support 3 to the left as shown by arrows C and D, and arrow E
It is discharged to the outside as shown in.

By the cooling air that flows through the brush holder supports 3 to the left, the ventilation holes of the brush holder supports 3 are formed.
Since the brush holder 4 and the brush 5, which are located between 12 and serve as the highest temperature rising portion, are cooled, the cooling effect around the brush can be enhanced.

Further, each brush 5 and brush holder 5
Is fixed to each partition 9B via an annular brush holder support 3 and an insulating support plate 2, and has particularly high rigidity against a force applied in a direction orthogonal to the axis of the shaft 7, so that the collector ring 6 has Vibration of the pressed brush 5 and the brush holder 4 that presses the brush 5 against the collector ring 6 can be reduced, and abrasion of the brush 5 and generation of sparks and temperature rise due to this vibration can be prevented.

Further, the brush holder support 3 can be supported only by the insulating support plate 2, and as shown in FIG. 4 showing a conventional rotary electric machine, an insulating cylinder incorporated in the brush holder support 22.
22A, 22B, 22C, 22E and the four insulating flanges 4 do not form a complicated fixing structure, so that assembly is also easy.

Next, FIG. 3 is a cross-sectional view showing another embodiment of the rotating electric machine of the present invention and corresponds to FIG. In FIG. 3, the brush holder support 3A is formed into a square whose four corners are chamfered, and inside the center of each side of the square,
Small-diameter ventilation holes 12A are formed, and these ventilation holes are
A pair of ventilation holes 12 having the same diameter as in FIG. 2 are formed between the 12A.

A pair of mounting holes 3b are provided in the chamfered portions at the four corners of the substantially square brush holder support 3A, and the inner circumference of the brush holder support 3A is made substantially by the bolts inserted into the mounting holes 3b. It is fixed to each partition formed in a square shape. In this case, since the floor area occupied by the collector cover can be reduced, there is an advantage that the installation area of the rotary electric machine can be reduced.

[0027]

As described above, according to the first aspect of the present invention, the partition plate is provided in the collector cover, and the brush holder disposed on the outer periphery of the collector ring inserted into the rotating shaft in the collector cover is provided. In a rotary electric machine provided with an annular support plate for supporting, a support plate supporting the brush holder is rotated by providing an annular insulating plate having an outer periphery supported by a partition plate and an inner periphery supporting the outer periphery of the support plate. Since the outer periphery is supported by the insulating plate which is provided in the direction orthogonal to the axis and whose outer periphery is supported by the partition plate, it is possible to obtain the rotating electric machine capable of reducing the abrasion of the brush.

According to the invention described in claim 2, in the invention described in claim 1, the insulating plate is provided with a ventilation hole for allowing cooling air inside the collector cover to flow through in the axial direction. A support plate that supports the holder is supported by an insulating plate that is provided in a direction orthogonal to the rotation axis and that has an outer periphery supported by a partition plate, and a brush holder and a brush supported by the brush holder are provided on the insulating plate. Since it was cooled by the cooling air flowing through the ventilation holes in the axial direction,
It is possible to obtain a rotating electric machine that can reduce the wear of the brush and enhance the cooling effect.

[Brief description of drawings]

FIG. 1 is a half sectional view showing an embodiment of a rotating electric machine of the invention described in claims 1 and 2.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a half cross-sectional view showing another embodiment of the rotating electric machine of the invention described in claims 1 and 2.

FIG. 4 is a half sectional view showing an example of a conventional rotating electric machine.

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

[Explanation of symbols]

1 ... Collector cover, 2 ... Insulation plate, 3 ... Brush holder support, 4 ... Brush holder, 5 ... Brush, 6 ... Collector ring, 7 ... Shaft, 8 ... Collector fan, 9A, 9B, 9C ...
Partition plate, 12 ... ventilation holes.

Claims (2)

[Claims] 1. A rotating member provided with a partition plate inside the collector cover, and an annular supporting plate for supporting a brush holder arranged on the outer periphery of a collector ring inserted into a rotating shaft in the collector cover. In the electric machine, an outer periphery is supported by the partition plate, and an annular insulating plate that supports the outer periphery of the support plate at the inner periphery is provided. 2. The rotating electric machine according to claim 1, wherein the insulating plate is provided with a ventilation hole that allows cooling air inside the collector cover to flow therethrough in the axial direction.