JPH0998546A - Brush holding apparatus of rotating electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the variations of the pressures applied to the brushes of a rotating electric machine and suppress their axial fluctuations to facilitate its assembling. SOLUTION: On the outer peripheral side of brushes 2 arranged radially on the outer peripheral of a collector ring 1 via brush holders 3, a strip 4 curved in a U-shaped manner is wound. With both the ends of this strip 4, one end of each tension spring 5 is connected respectively for the other end to be fixed respectively to a lower base 8 via fixtures 8a made of an FRP material and formed in an L-shaped manner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brush supporting device for a rotary electric machine.

[0002]

2. Description of the Related Art FIG. 4 is a partial vertical cross-sectional view of a wire wound induction motor, and FIG. 5 is an enlarged detailed view of a BB cross section of FIG. FIG.
And in FIG. 5, on the outer circumference of the collector ring 1 which is annularly provided on one side of the rotor of the wound-rotor induction motor,
The four brush holders 3 are symmetrically arranged on the left and right, and are fixed via a mounting plate 6 described later.

The brush 2 is inserted into each brush holder 3, and one side of the spring 14 is fixed via a claw portion inserted into the locking hole 3a. This spring 14
The head of the brush 2 is pressed by the coiled tip.

Each brush holder 3 is fixed to an annular mounting plate 6 shown in FIG. 4, and this mounting plate 6 is shown in FIG.
It is fixed to a stator (not shown) via fixing tools 7 provided at intervals.

In the brush supporting device for a rotary electric machine constructed as described above, the collector ring 1 is rotated by the rotation of the rotor of the wire-wound induction motor, and the current flowing through the collector ring 1 is generated by these brushes. It is guided to the outside via a pigtail wire (not shown) connected to the No. 2 cable. Further, when the brush 2 is worn, the pressing force of the spring 14 is reduced, so that the brush 2 can be replaced during maintenance and inspection.

By the way, in the brush supporting device of the rotary electric machine constructed as described above, the collector ring 1 also oscillates in the direction orthogonal to the axis line with the rotation of the rotor, but it is connected to the winding type induction motor. In the case of a pump, for example, the load may also vibrate in the axial direction. Further, when the magnetic center in the axial direction between the stator and the rotor is slightly deviated due to a manufacturing error, vibration in the axial direction occurs.

[0007]

However, in the brush supporting device for a rotary electric machine configured as described above, since the spring 14 is attached to each brush,
Not only is it time-consuming to assemble, but a slight manufacturing error between the springs may change the pressure applied to each brush.

Then, since the wear of each brush is also uneven, the particular brush is greatly worn before the regular inspection,
The contact pressure may be insufficient to cause overheating, and sparks may be generated between the contact ring and the collector ring.

In addition, the above-mentioned axial vibration should occur.
When applied to the brush, the brush may also vibrate, causing overheating and sparks. Therefore, an object of the present invention is to provide a brush supporting device for a rotating electric machine that prevents variations in pressure applied to the brush, suppresses axial movement, and facilitates assembly.

[0010]

According to a first aspect of the present invention, there is provided a brush supporting device for a rotating electric machine, wherein a plurality of brush holders are radially arranged on an outer periphery of a collector ring, and one side of the brush holder is inserted into the brush holder. In a brush supporting device of a rotary electric machine, in which a spring is pressed against a collector ring by a spring tool, an intermediate portion of a strip plate is wound around the other side of the brush, and an end portion of the strip plate is inserted through an elastic body to It is characterized by being fixed to the stator frame.

The brush supporting device for a rotating electric machine according to a second aspect of the invention is characterized in that the strip plate is made of a metal material for a spring.

A brush supporting device for a rotating electric machine according to a third aspect of the invention is characterized in that the elastic body is a coil spring.

Further, a brush supporting device for a rotating electric machine according to a fourth aspect of the present invention is characterized in that a through hole through which the strip plate is inserted is formed on the other side of the brush.

Further, the brush supporting device of the rotating electric machine according to the invention of claim 5 is characterized in that a U-shaped groove into which the strip plate is fitted is formed on the other side of the brush.

By such means, in the brush supporting device for a rotating electric machine of the present invention, each brush is moved in the axial direction of the rotating electric machine by the strip plate of one phase for each end whose end is pulled through the elastic body. It is pressed uniformly.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a brush supporting device for a rotating electric machine according to the present invention will be described below with reference to the drawings. FIG.
FIG. 4 is a partial vertical cross-sectional view showing a first embodiment of the brush supporting device for a rotary electric machine of the present invention, and is a view corresponding to FIG. 4 showing the conventional technique and corresponding to claim 1. 2 is an enlarged detailed view of the AA cross section of FIG. 1 and is also a view corresponding to FIG.

1 and 2, unlike the prior art shown in FIGS. 4 and 5, the springs for pressing the brushes 2 of the respective phases are two tension springs 5, respectively. That is, both ends of the strip plate 4 that presses the brushes 2 are connected to the tension springs 5 by the restoring force of the springs 5. Since the brush holder 3, the mounting plate 6 and the like are the same as those shown in FIGS. 4 and 5 shown in the prior art, the same reference numerals are given and the description thereof will be omitted.

In FIGS. 1 and 2, on the pressing side of each brush 2, as shown in FIG. 2, a long rectangular hole 2a is formed in advance in a direction parallel to the axis. The length of the square hole 2 a is slightly longer than the width of the strip plate 4.

On the other hand, on the lower base 8 of the stator of the wound-rotor induction motor, a fixture 8a made of polyester resin containing glass-reinforced fiber is formed in an L shape in FIG.
However, in FIG. 1, they are fixed symmetrically with respect to the axis.

A hook portion formed at the lower end of the tension spring 5 wound by tight winding is fixed to the upper portion of the fixture 8a with a bolt. A lower end of a strip plate 4 made of a spring steel material, which is curved in a substantially U-shape whose opening side is slightly narrow, is fixed to a hook portion above the tension spring 5 with a bolt. As shown in FIG. 2, the strip plate 4 is previously inserted into the square hole 2a formed in each brush 2.

As a result, both ends of the strip plate 4 are pulled downward by the restoring force of the tension spring 5, and the strip plate 4
Thus, the brushes 2 arranged in an arc shape are pressed in the axial direction of the rotor.

In the brush supporting device for a rotary electric machine constructed in this way, the pressing force applied to each brush 2 can be made uniform by the restoring force of the tension spring 5, so that the brushes between the brushes can be made uniform. It is possible to prevent variations in wear.

Further, since the springs conventionally required for each brush can be replaced by two return springs for each layer, not only the assembly is easy but also the maintenance and inspection time can be shortened. it can.

Further, even if axial vibration is transmitted to the brush due to the rotation of the wound-rotor induction motor, both side surfaces of the strip plate 4 are in contact with the square hole 2a, so that the axial direction of the brush is not affected. Vibration can also be suppressed.

In order to prevent variations in pressing force between the brushes due to friction between the strip plate 4 and the heads of the brushes 2, a low friction material such as fluororesin is applied to the inner surface of the strip plate 4. May be coated.

Further, in order to prevent the fluctuation of the pressing force against the brush 2 due to the manufacturing variation of the tension spring 5, a thin liner may be inserted between the fixture 8a and the lower base 8 for adjustment. Good.

FIG. 3 is a partially enlarged detailed view showing a second embodiment of the brush supporting device for a rotating electric machine of the present invention, and is a view corresponding to FIG. In FIG. 3, a shallow U-shaped groove is formed on the head of the brush 2A, and the strip plate 4 is fitted in this groove.

In the brush 2A having the U-shaped groove as described above, the strip plate 4 is different from the brush 2 shown in FIG.
Not only is it easy to form the fitting portion of the belt, but like the brush supporting device of the rotary electric machine shown in FIG. Two
Since it is not necessary to insert it into a, there is an advantage that the brush 2A can be easily replaced at the time of assembly, maintenance and inspection.

Incidentally, in the above-mentioned embodiment, in order to prevent the variation of the pressing force due to the friction between the strip plate 4 and the brush 2, the example in which the inner surface side of the strip plate 4 is coated with the fluororesin has been described. In the case of the brush 2A indicated by, it may be applied to the inner circumference of the U-shaped groove. Further, in the above embodiment,
Although the case of the wound-rotor induction motor has been described, the present invention can be similarly applied to, for example, a synchronous motor.

[0030]

As described above, according to the first aspect of the present invention,
In a brush supporting device of a rotating electric machine, a plurality of brush holders are radially arranged on the outer circumference of the collector ring, and the brush inserted into the brush holder on one side is pressed against the collector ring via a spring tool. By winding the middle portion of the strip plate and fixing the end portion of the strip plate to the stator frame of the rotating electric machine via the elastic body, a strip of each phase whose end portion is pulled through the elastic body Since each brush is uniformly pressed in the axial direction of the rotary electric machine by the plate, it is possible to obtain a brush supporting device for the rotary electric machine that prevents variations in pressure applied to the brushes, suppresses axial movement, and facilitates assembly. it can.

According to the second aspect of the present invention, the band plate is made of the metal material for spring, and the end portion is pulled through the elastic body. Since each brush is uniformly pressed in the axial direction of the rotary electric machine by the plate, it is possible to obtain a brush supporting device for the rotary electric machine that prevents variations in pressure applied to the brushes, suppresses axial movement, and facilitates assembly. it can.

According to the third aspect of the present invention, by using the elastic body as a coil spring, each brush is rotated by a strip plate of one phase for each end whose end is pulled through the coil spring. Since it is uniformly pressed in the axial direction, the variation in the pressure applied to the brush can be prevented, the movement in the axial direction can be suppressed, and the brush supporting device of the rotating electric machine can be easily assembled.

Further, according to the invention described in claim 4, the through hole through which the strip is inserted is formed on the other side of the brush so that the end portion is pulled through the elastic body. Since each brush is pressed uniformly in the axial direction of the rotating electric machine by the strip of one phase for each phase, the variation of the pressure applied to the brush is prevented, the axial movement is suppressed, and the assembly is easy. It is possible to obtain a brush supporting device for a rotating electric machine.

Further, according to the invention of claim 5,
By forming a U-shaped groove into which the strip plate fits on the other side of the brush, the end portion is pulled through the elastic body and the strip of one phase for each phase fitted in the U-shaped groove Since each brush is uniformly pressed in the axial direction of the rotary electric machine by the plate, it is possible to obtain a brush supporting device for the rotary electric machine that prevents variations in pressure applied to the brushes, suppresses axial movement, and facilitates assembly. it can.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of a brush supporting device for a rotary electric machine of the invention, and is a diagram corresponding to claims 1, 2, 3, and 4. FIG.

FIG. 2 is an enlarged detailed view taken along the line AA of FIG.

FIG. 3 is an enlarged detailed view of a partial cross section showing a second embodiment of the brush supporting device for a rotating electric machine of the present invention.

FIG. 4 is a diagram showing an example of a conventional brush supporting device for a rotary electric machine.

5 is an enlarged detailed view of a B-B cross section of FIG. 4;

[Explanation of symbols]

1 ... Collector ring, 2, 2A ... Brush, 3 ... Brush holder, 4 ... Strip plate, 5 ... Tension spring, 6 ... Mounting plate, 7, 8
a ... Fixing device, 8 ... Lower base, 14 ... Spring.

Claims (5)

[Claims] 1. A brush supporting device for a rotary electric machine, wherein a plurality of brush holders are radially arranged on an outer periphery of a collector ring, and a brush having one side inserted into the brush holder is pressed against the collector ring via a spring member. A brush supporting device for a rotary electric machine, characterized in that an intermediate portion of the strip is wound around the other side of the brush, and an end portion of the strip is fixed to a stator frame of the rotary electric machine via an elastic body. . 2. The brush supporting device for a rotating electric machine according to claim 1, wherein the strip plate is made of a metal material for springs. 3. The brush supporting device for a rotary electric machine according to claim 1, wherein the elastic body is a coil spring. 4. A through hole through which the strip plate is inserted is formed on the other side of the brush.
A brush supporting device for a rotating electric machine according to claim 3. 5. The rotating electric machine according to claim 1, wherein a U-shaped groove into which the strip plate is fitted is formed on the other side of the brush. Brush support device.