JP2005057877A - Rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a shortage by brush powder from being generated even if it is brought into a state that a large quantity of the brush powder is generated (for example, the vicinity of a wear limit of a brush) by discharging smoothly the brush powder between a holder and a commutator (between a member covering a periphery of the brush and a commutator). <P>SOLUTION: A rotary electric machine includes a holder plate 20 having a slit 22 opened at the inner end of a brush slide contact part. Thus, since the brush powder between a holder and a commutator is discharged smoothly to a lower space from the slit 22, the deposition of the brush powder between the holder and the commutator is prevented, and a short circuit does not occur. Moreover, since the brush powder between the holder and the brush is discharged down smoothly from the slit 22, even if it reaches the vicinity of a brush wear limit, the deposition of the brush powder between the holder and the brush is prevented, and the sliding deterioration of the brush in the vicinity of the brush wear limit can be prevented. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rotating electrical machine having a brush, and more particularly to discharge and diffusion of brush wear powder.

An example of the rotating electrical machine will be described with reference to FIG.
The rotating electrical machine J1 shown in FIG. 6 is used in a state where the rotating shaft J2 is directed vertically, and has a structure in which the brush holding member J5 holds the brush J4 pressed against the commutator J3.
The brush holding member J5 comprises a brush holder J6 for holding the brush J4 and a holder plate J8 for fixing the brush holder J6 directly or indirectly to the housing J7.

The brush J4 is worn by sliding contact with the commutator J3 and generates brush powder (wear powder). For this reason, when the rotating electrical machine J1 is used for a long period of time, a large amount of brush powder is generated due to wear of the brush J4.
When a large amount of generated brush powder accumulates in the vicinity of brush J4, (a) commutation failure that short-circuits between segments in commutator J3 occurs, (b) energization failure that short-circuits between commutator J3 and housing J7 occurs, (C) There is an increased possibility of a failure in energization that short-circuits the brush J4 and the housing J7.

  Therefore, in the rotating electrical machine J1 shown in FIG. 6, as shown in FIG. 7, a slit J9 penetrating in the vertical direction is provided on the holder plate J8 at a position away from the brush holder J6, and an attempt is made to deposit on the upper surface of the holder plate J8. A technique has been devised in which the brush powder is discharged downward from the slit J9 to prevent the brush powder from accumulating on the upper surface of the holder plate J8 (Patent Document: None).

(Problem 1)
According to the above-described prior art, the brush powder to be deposited on the upper surface of the holder plate J8 at a position away from the brush holder J6 can be discharged downward from the slit J9, but "a member covering the periphery of the brush J4 (brush holding member J5)""And the commutator J3" (hereinafter referred to as the "holder / commitor") brush powder is not sufficiently effective.
For this reason, when the rotating electrical machine J1 is used for a long period of time and a large amount of brush powder is generated (for example, near the wear limit of the brush J4), the amount of brush powder deposited between the holder and the consummator increases. The short circuits (a) to (c) may occur through the brush powder.

(Problem 2)
Further, in the prior art, means for discharging brush powder deposited between “a member covering the periphery of the brush J4 (brush holding member J5)” and “brush J4” (hereinafter referred to as a holder / brush) is provided. It was not provided.
For this reason, when a large amount of brush powder is generated (for example, near the wear limit of the brush J4), the amount of brush powder deposited between the holder and the brush increases, and the slidability of the brush J4 decreases.
In order to prevent the slidability of the brush J4 from being lowered, it is conceivable to increase the urging force of the brush J4 by the spring J10. However, if the urging force of the brush J4 is increased, the performance change of the rotating electrical machine J1 due to the current increase accompanying the increase of the initial load of the brush J4, the output decrease due to the increase of the sliding load of the brush J4 and the commutator J3, the brush J4 This causes problems such as rapid wear. For this reason, there is a request to avoid increasing the biasing force of the brush J4.

(Object of invention)
The first purpose is to smoothly discharge the brush powder between the holder / consumer to the outside, and even if a large amount of brush powder is generated (for example, near the wear limit of the brush), the occurrence of a short circuit due to the brush powder. prevent.
The second object is to smoothly discharge the brush powder between the holder and the brush to the outside and prevent the brush from sliding down near the wear limit of the brush without increasing the urging force of the brush by the urging means.

[Means of claim 1]
The rotating electrical machine adopting the means of claim 1 is provided with a brush powder discharging notch (different from the pigtail insertion groove) in the brush holding member covering the periphery of the brush and having an open end on the arrangement side of the commutator. It is to be prepared.
Thus, by providing the brush powder discharge notch on the member covering the periphery of the brush, the brush powder between the holder and the consumable can be smoothly discharged from the notch to the outside. For this reason, even when a large amount of brush powder is generated (for example, near the wear limit of the brush), accumulation of the brush powder between the holder and the consumable is prevented, and a short circuit occurs due to the accumulated brush powder. Can be prevented.

  Further, by providing the notch in the member covering the periphery of the brush, the brush powder between the holder and the brush can be smoothly discharged from the notch to the outside. For this reason, even when a large amount of brush powder is generated (for example, near the wear limit of the brush), accumulation of the brush powder between the holder and the brush is prevented. For this reason, the sliding fall of the brush in the vicinity of the wear limit of the brush can be prevented without increasing the biasing force of the brush by the biasing means.

[Means of claim 2]
A brush holding member of a rotating electrical machine that employs the means of claim 2 comprises a brush holder that slidably holds a brush toward a commutator, and a holder plate that directly or indirectly fixes the brush holder to the housing. The cutout portion for discharging powder is provided on the holder plate.

[Means of claim 3]
A space for depositing the brush powder discharged downward from the notch is provided below the notch of the rotating electrical machine employing the means of claim 3.
A large amount of brush powder discharged from the notch is deposited in a space below the notch. For this reason, it is possible to avoid the problem that the brush powder discharged to the lower part of the notch is accumulated up to the vicinity of the brush and the commutator and a short circuit occurs due to the accumulated brush powder.

[Means of claim 4]
The notch of the rotating electrical machine that employs the means of claim 4 is a slit.

[Means of claim 5]
In the rotating electrical machine employing the means of claim 5, a brush powder diffusing slit is provided on the non-coil connecting brush non-sliding portion of the commutator piece.
The brush powder accumulates below the brush due to the wear of the brush, and when the deposited brush powder touches the slit, the accumulated brush powder is blown around by centrifugal force (diffusion action). This prevents the accumulation of more than a certain amount of brush powder, and even when a large amount of brush powder is generated (for example, near the wear limit of the brush), a short circuit occurs due to the accumulated brush powder. Can be prevented.

[Means of claim 6]
The slit of the rotary electric machine that employs the means of claim 6 comprises a brush holding member and a portion that overlaps in the rotation axis direction and a portion that does not overlap.
In this way, by providing a slit that partially overlaps the brush holding member, the brush powder between the holder and the consummer falls into the slit where it overlaps, and the brush powder that falls into the slit rotates the rotor. It is blown away from the non-overlapping part by centrifugal force. That is, the brush powder between the holder / consumer can be diffused to the outer periphery of the slit.
As a result, even when a large amount of brush powder is generated (for example, near the wear limit of the brush), accumulation of the brush powder between the holder and the consumables is prevented, and a short circuit occurs due to the accumulated brush powder. Can be prevented.

Further, since the accumulation of the brush powder between the holder and the commissure is prevented, the brush powder between the holder and the brush can also move smoothly between the holder and the consumable. As a result, the accumulation of brush powder between the holder and the brush is prevented.
For this reason, even when a large amount of brush powder is generated (for example, near the wear limit of the brush), the accumulation of brush powder between the holder and the brush is prevented, so the biasing force of the brush by the biasing means is increased. Without this, it is possible to prevent the brush sliding from decreasing near the wear limit of the brush.

[Means of Claim 7]
In the rotating electrical machine employing the means of claim 7, the insulating member for insulatingly holding the commutator piece bulges on the side opposite to the coil connection side than the commutator piece, and a slit for brush powder diffusion is provided on the bulging portion of the insulating member. It is provided.
Similar to the means of claim 5 described above, brush powder accumulates below the brush due to wear of the brush, and when the accumulated brush powder touches the slit, the accumulated brush powder is blown around by the centrifugal force (diffusion) Action). This prevents the accumulation of more than a certain amount of brush powder, and even when a large amount of brush powder is generated (for example, near the wear limit of the brush), a short circuit occurs due to the accumulated brush powder. Can be prevented.

[Means of Claim 8]
A space for depositing brush powder diffused by centrifugal force from the slit is provided around or below the slit of the rotating electrical machine employing the means of claim 8.
A large amount of brush powder diffused by the centrifugal force from the slit is deposited in a space around (or below) the slit. For this reason, the malfunction that the brush powder diffused around the slit (or below the circumference) accumulates to the vicinity of the brush and the commutator is avoided.

[Means of claim 9]
A plurality of slits of the rotating electrical machine adopting the means of claim 9 are formed at a predetermined angle with respect to the rotating direction of the rotor.

[Means of Claim 10]
The slit of the rotary electric machine which employ | adopts the means of Claim 10 is formed for every commutator piece.

[Means of Claim 11]
The width (dimension perpendicular to the longitudinal direction of the slit) and the length (dimension in the longitudinal direction of the slit) of the rotary electric machine adopting the means of claim 11 are both set to 1.8 mm or more.
Thus, by setting the width and length of the slit to 1.8 mm or more, the brush powder that has entered the slit can be smoothly discharged without clogging.

(Best Mode 1)
The rotating electrical machine includes a brush powder discharging notch (for example, different from a slit and a pigtail insertion groove) in which an end on the side of the commutator is opened in a member that covers the periphery of the brush in the brush holding member.
(Best Mode 2)
The rotating electrical machine includes a brush powder diffusing slit in the non-coil connecting brush non-sliding portion of the commutator piece.
(Best Mode 3)
In the rotating electrical machine, an insulating member that insulates and holds the commutator piece swells on the side opposite to the coil connection side than the commutator piece, and includes a slit for brush powder diffusion.

A first embodiment will be described with reference to FIGS.
First, the rotating electrical machine 1 will be described with reference to FIG. A rotating electrical machine 1 shown in the first embodiment is a motor for an electric air pump mounted on a vehicle.
The rotating electrical machine 1 includes a field 4 (stator) configured by arranging a plurality of magnets 3 on the inner periphery of a cylindrical yoke 2, and an armature 5 (rotor) disposed on the inner periphery of the field 4. The armature 5 includes a brush assembly 9 and the like in which a plurality of brushes 7 that are in contact with a commutator 6 provided in the armature 5 are disposed in a housing 8.

The armature 5 includes a rotating shaft 11 that is rotatably supported in the rotating electrical machine 1, an armature core 12 fixed to the outer periphery of the rotating shaft 11, an armature coil wound around the armature core 12, a commutator 6, and the like. Composed.
In the commutator 6, a plurality of commutator pieces 15 (segments) made of a copper material, which are insulated and held by an insulating member 14 (mold resin or the like, code: see FIGS. 4 and 5), are arranged in a cylindrical shape on the outer periphery of the rotating shaft 11. Each commutator piece 15 is electrically and mechanically coupled to the armature coil.

The brush assembly 9 is a brush 7 that is pressed against the commutator 6, a brush holding member 16 that holds the brush 7 slidably toward the commutator 6, and a compression coil type that biases the brush 7 toward the commutator 6. And a spring 17 (biasing means).
As shown in FIG. 1B, the brush holding member 16 includes a brush holder 18 that holds the brush 7 slidably toward the commutator 6, and the brush holder 18 is attached to the housing 8 via a resin spacer 19. It consists of a holder plate 20 that is indirectly fixed.

The brush 7 is mainly composed of copper powder, and has, for example, a prismatic shape with a rotational axis direction dimension of 21 mm, a radial dimension (pressing direction of the brush 7) of 15 mm, and a width of 6 mm.
When the spring 17 is viewed from the pressing direction of the brush 7, a part of the diameter of the spring 17 protrudes to the outside of the brush 7, and the center of both side surfaces of the brush holder 18 is curved so as to cover the spring 17. Bulges.
The brush holder 18 is formed by stamping and bending by a press. The brush holder 18 holds the brush 7 having the shape described above in a slidable manner and has a substantially U-shaped cross section for housing the spring 17. Presents a rectangular shape. The brush holder 18 has a U-shaped opening side fixed to the holder plate 20, and the brush holder 18 and the member that surrounds the brush 7 with the holder plate 20 (corresponding to a member that covers the periphery of the brush 7 in the brush holding member 16). 7 is held.
On the other hand, the holder plate 20 has a flat plate shape in which a hole 21 through which the commutator 6 is inserted is formed at the center, and is formed by punching. The hole 21 has a diameter slightly larger than the outer diameter of the commutator 6.

[Features of Example 1]
As shown in FIG. 3, the rotating electrical machine 1 according to the first embodiment is mounted on a vehicle with the rotating shaft 11 facing in the vertical direction. The commutator 6 is disposed below the armature core 12, and the brush holder 18. The holder plate 20 is arranged on the lower side.
As shown in FIG. 1A, the brush holding member 16 covers the periphery of the brush 7, as shown in FIG. 1A, a brush powder discharge slit 22 (corresponding to a notch) having an opening on the arrangement side of the commutator 6. Is provided. This slit 22 is different from the pigtail insertion groove (not shown in this embodiment) of the pigtail connected to the brush 7.
Specifically, in the first embodiment, the slit 22 is formed in a holder plate 20 (a portion on which the brush 7 slides) positioned below a member covering the periphery of the brush 7.
The slit 22 is provided to extend in the pressing direction of the brush 7 for the purpose of minimizing the decrease in rigidity of the holder plate 20 as much as possible.

Here, the length (dimension in the pressing direction of the brush 7) and the width (dimension in the direction orthogonal to the pressing direction of the brush 7) of the slit 22 are preferably both set to 1.8 mm or more.
The reason why it is preferable to set the length and width of the slit 22 to 1.8 mm or more will be described with reference to FIG. This FIG. 2 sets the length of the slit 22 as long as about 3 to 5 mm, changes the width of the slit 22 in various ways, and shows the experimental results of investigating the brush powder discharge condition (occurrence of short circuit by the brush powder). It is a graph to show.
As can be confirmed from the graph of FIG. 2, when the width of the slit 22 is smaller than 1.8 mm, a tendency to easily cause a short circuit occurs. This is presumably because if the width of the slit 22 is smaller than 1.8 mm, the brush powder is likely to be clogged in the slit 22 and defective discharge occurs. Since this is also true for the length of the slit 22, it is preferable to set the length and width of the slit 22 to 1.8 mm or more.

On the other hand, the holder plate 20 is formed with slits 24 on both sides of a screw hole 23 for fixing the holder plate 20 to the spacer 19. This slit 24 has the same role as the slit J9 (symbol: see FIG. 7) shown in the prior art. The brush powder accumulated on the upper surface of the holder plate 20 is discharged downward from the slit 24, and the holder 24 This is to prevent brush powder from accumulating on the upper surface of the plate 20.
Both the slits 22 and 24 are formed by being punched simultaneously with the cutting of the central hole 21 and the outer peripheral edge.

Brush powder is discharged downward from both slits 22, 24.
Below the holder plate 20, a space α for accumulating the brush powder discharged downward from both the slits 22 and 24 is secured by the spacer 19. The space α has a volume that prevents the upper end of the accumulated brush powder from reaching the commutator 6 even when the brush 7 reaches the wear limit.

[Effect of Example 1]
When the rotating electrical machine 1 is operated and the armature 5 is rotated, the brush 7 is in rotational contact with the commutator 6, so that the brush 7 is worn little by little to generate brush powder.
The brush powder discharging slit 22 having an opening on the arrangement side of the commutator 6 is provided on the member (holder plate 20) with which the lower surface of the brush 7 is slidably contacted. It is smoothly discharged into the lower space α. For this reason, even when a large amount of brush powder is generated (for example, near the wear limit of the brush 7), the accumulation of the brush powder between the holder / consumer is prevented and a short circuit occurs due to the accumulated brush. Can be avoided.

  Further, by providing the slit 22 in the member (holder plate 20) with which the lower surface of the brush 7 is in sliding contact, the brush powder between the holder and the brush can be smoothly discharged downward from the slit 22. For this reason, even when a large amount of brush powder is generated (for example, near the wear limit of the brush 7), accumulation of the brush powder between the holder and the brush is prevented. For this reason, the sliding fall of the brush 7 in the vicinity of the wear limit of the brush 7 can be prevented without increasing the biasing force of the brush 7 by the spring 17.

  Furthermore, a space α for depositing brush powder discharged downward from the slit 22 is provided below the slit 22, so that the brush powder discharged downward from the slit 22 is accumulated to the vicinity of the brush 7 and the commutator 6. Can be avoided.

In the first embodiment, an example is shown in which the rotating shaft 11 is mounted on a vehicle in a state in which the rotating shaft 11 faces in the vertical direction. The rotating shaft 11 was installed horizontally, and a brush powder accumulation test was performed. As a result, it was confirmed that the brush powder was smoothly discharged from the slit 22, and the same effect as described above was obtained. In other words, the rotary electric machine 1 is not limited to the rotary electric machine 1 installed in a state where the rotary shaft 11 faces in the up-and-down direction, and can be applied to the rotary electric machine 1 installed in the other direction. It is.
Moreover, in Example 1, although the example which forms the slit 22 in the part located under the brush 7 was shown, it is slit 22 (different from a pigtail insertion groove) in other site | parts (a side surface, an upper surface, etc. of the brush 7). May be provided.

  A second embodiment will be described with reference to FIG. In the following embodiments, the same reference numerals as those in the first embodiment indicate the same functions. Further, in the following embodiments, as in the first embodiment, the rotating shaft 11 of the rotating electrical machine 1 is mounted on the vehicle in a state in which the rotating shaft 11 is directed vertically (the commutator 6 is below the armature core 12), and the lower surface of the brush 7 is the holder. Only the difference will be described below.

In the first embodiment, the slit 22 is formed in the holder plate 20, but in the second embodiment, the slit 31 is formed on the non-coil connecting side of each commutator piece 15 on the non-coil connection side (sliding with the brush 7). It is provided in the non-moving part).
The slit 31 of the second embodiment includes an upper side that overlaps the holder plate 20 in the rotation axis direction and a lower side that does not overlap. Further, the slit 31 of the second embodiment is formed at the center of the commutator piece 15 on the anti-coil connection side so as to extend in the rotation axis direction, and the end of the slit 31 opens on the anti-coil connection side.

The length (dimension in the direction of the rotation axis) of the slit 31 of the second embodiment is set such that the upper end of the slit 31 overlaps the holder plate 20 as described above, and is at least 1.8 mm. It is provided above. In addition, the width of the slit 31 (the dimension orthogonal to the rotation shaft 11) is at least 1.8 mm. The length and width dimensions of the slit 31 being 1.8 mm or more are due to the reason described in Example 1 (brush powder is discharged without clogging). For the same reason (brush powder is discharged without clogging), the depth of the slit 31 is preferably 1.8 mm or more.
The slit 31 is a recess formed in the commutator piece 15 by press working such as pressing, but may be formed by cutting or the like.

[Effect of Example 2]
As in the second embodiment, the brush powder between the holder and the consumm falls into the upper slit 31 that overlaps the holder plate 20, and the brush powder that has fallen into the slit 31 becomes a holder by centrifugal force due to the rotation of the armature 5. It is blown away from the lower side of the slit 31 that does not overlap the plate 20. That is, the brush powder between the holder / consumer can be diffused to the outer periphery of the slit 31.
As a result, even when a large amount of brush powder is generated (for example, near the wear limit of the brush 7), the brush powder is prevented from accumulating between the holder and the consumable, and a short circuit occurs due to the accumulation of the brush powder. A malfunction can be prevented.

Also, the brush powder between the holder and the brush once moves between the holder and the consumable, then falls into the slit 31 and is diffused from the slit 31 by the rotation, so that the accumulation of the brush powder between the holder and the brush is also prevented. It is.
As a result, even if a large amount of brush powder is generated (for example, near the wear limit of the brush 7), accumulation of the brush powder between the holder and the brush is prevented. Without increasing, it is possible to prevent the brush 7 from sliding down near the wear limit of the brush 7.

As described above, the brush powder diffused to the periphery by the slit 31 is discharged around or below the slit 31.
Below the holder plate 20 (around and below the slit 31), as described in the first embodiment, a space α for accumulating brush powder is secured by the spacer 19. For this reason, even if the brush 7 reaches the wear limit, the upper end of the brush powder accumulated in the space α does not reach the commutator 6.

  In this second embodiment, an example is shown in which the rotating shaft 11 is mounted on a vehicle in a state in which the rotating shaft 11 faces in the up-down direction. it can. In other words, the rotary electric machine 1 is not limited to the rotary electric machine 1 installed in a state where the rotary shaft 11 faces in the up-and-down direction, and can be applied to the rotary electric machine 1 installed in the other direction. It is.

In the second embodiment, the slit 31 of the commutator piece 15 partially overlaps with the brush holding member 16 (for example, the holder plate 20). However, the slit 31 of the commutator piece 15 is connected to the brush holding member 16 as an example. You may provide so that it may not overlap in the rotating shaft direction.
Even if it provides in this way, when the accumulated brush powder touches the slit 31, the accumulated brush powder is blown away by the centrifugal force by the slit 31 (diffusion action), and accumulation of the brush powder above a certain level is prevented. Accordingly, even when a large amount of brush powder is generated (for example, near the wear limit of the brush 7), it is possible to prevent a short circuit from occurring due to the accumulation of the brush powder.

  In the second embodiment, the slits 31 are provided in each commutator piece 15, but one or more slits may be provided for all the commutator pieces 15. In the case where a plurality of armatures 5 are provided, they may be formed at a predetermined angle with respect to the rotation direction of the armature 5.

A third embodiment will be described with reference to FIG.
In the second embodiment, the example in which the slit 31 is provided in each commutator piece 15 is shown. On the other hand, in the third embodiment, as shown in FIG. 5, when the insulating member 14 that insulates and holds the commutator piece 15 bulges away from the commutator piece 15 on the side opposite to the coil connection side, the insulating member 14 swells. A slit 32 for diffusing brush powder is provided at the exit portion.

  The slit 32 of the third embodiment is formed so as to extend in the rotation axis direction, similarly to the slit 31 of the second embodiment, and the end of the slit 32 is opened on the anti-coil connection side. A plurality of slits 32 are provided corresponding to each commutator piece 15, but at least one slit may be provided at the bulging portion of the insulating member 14. When a plurality of slits 32 are provided, the rotation of the armature 5 is performed. A plurality are formed at a predetermined angle with respect to the direction.

The length (dimension in the rotation axis direction) and width (dimension perpendicular to the rotation axis 11) and width (dimension perpendicular to the rotation axis 11) of the slit 32 of Example 3 are both 1.8 mm or more so that the brush powder can be discharged without clogging. Is formed.
The slit 32 formed in the insulating member 14 is formed by a molding die when the insulating member 14 is molded.

[Effect of Example 3]
In Example 3, when the accumulated brush powder touches the slit 32, the accumulated brush powder is blown around by the centrifugal force generated by the slit 32 (diffusion action), and accumulation of the brush powder above a certain level is prevented. Accordingly, even when a large amount of brush powder is generated (for example, near the wear limit of the brush 7), it is possible to prevent a short circuit from occurring due to the accumulation of the brush powder.

The brush powder diffused to the periphery by the slit 32 is discharged to the periphery or below the slit 32.
Below the holder plate 20 (around and below the slit 32), a space α for accumulating the brush powder is secured by the spacer 19, so even if the brush 7 reaches the wear limit, the brush powder accumulated in the space α. Does not reach the commutator 6.

  In the third embodiment, an example is shown in which the rotating shaft 11 is mounted on the vehicle in a state in which the rotating shaft 11 faces in the up-down direction. it can. In other words, the rotary electric machine 1 is not limited to the rotary electric machine 1 installed in a state where the rotary shaft 11 faces in the up-and-down direction, and can be applied to the rotary electric machine 1 installed in the other direction. It is.

[Modification]
In each of the above embodiments, an electric air pump motor mounted on a vehicle is shown as an example of the rotating electrical machine 1, but the present invention is not limited to an electric air pump motor, and is used for power steering. The present invention is applicable to other electric motors using the brush 7 such as a motor.
You may use combining said each Example.

(Example 1) which is a top view of a brush holding member. It is a graph which shows the relationship between generation | occurrence | production of the slit width | variety and the discharge defect of brush powder (Example 1). (Example 1) which is sectional drawing of a rotary electric machine. (Example 2) which is a side view of an armature. (Example 3) which is a side view of an armature. It is sectional drawing of a rotary electric machine (conventional example). It is a top view of the brush holding member in a rotary electric machine (conventional example).

Explanation of symbols

1 Rotating electrical machine 5 Armature (rotor)
6 Commutator 7 Brush 8 Housing 14 Insulating member 15 Commutator piece 16 Brush holding member 17 Spring (biasing means)
18 Brush holder 20 Holder plate 22 Slit (notch) provided in brush holding member
31 Slit provided in the commutator piece 32 Slit provided in the bulging part of the insulating member α Space

Claims (11)

A rotor rotatably supported within the housing and provided with a commutator;
A brush that contacts the commutator piece of the commutator;
A brush holding member for slidably holding the brush toward the commutator;
Urging means for urging the brush toward the commutator;
In a rotating electrical machine comprising:
In the member that covers the periphery of the brush in the brush holding member,
Unlike a pigtail insertion groove of a pigtail connected to the brush, a rotating electric machine is provided with a brush powder discharge notch having an open end on the commutator arrangement side. In the rotating electrical machine according to claim 1,
The brush holding member comprises a brush holder that slidably holds the brush toward the commutator, a holder plate that directly or indirectly fixes the brush holder to the housing,
The rotating electrical machine according to claim 1, wherein the notch is provided in the holder plate. In the rotating electrical machine according to claim 1 or 2,
A rotating electric machine characterized in that a space for depositing brush powder discharged downward from the notch is provided below the notch. In the rotating electrical machine according to any one of claims 1 to 3,
The rotating electrical machine, wherein the notch is a slit. A rotor rotatably supported within the housing and provided with a commutator;
A brush that contacts the commutator piece of the commutator;
A brush holding member for slidably holding the brush toward the commutator;
Urging means for urging the brush toward the commutator;
In a rotating electrical machine comprising:
A rotating electrical machine characterized in that a brush non-sliding portion on the anti-coil connection side of the commutator piece is provided with a brush powder diffusion slit. In the rotating electrical machine according to claim 5,
The rotary electric machine according to claim 1, wherein the slit includes a portion that overlaps the brush holding member in a rotation axis direction and a portion that does not overlap. A rotor rotatably supported within the housing and provided with a commutator;
A brush that contacts the commutator piece of the commutator;
A brush holding member for slidably holding the brush toward the commutator;
Urging means for urging the brush toward the commutator;
In a rotating electrical machine comprising:
An insulating member for insulatingly holding the commutator piece bulges on the side opposite to the coil connection side than the commutator piece, and a slit for brush powder diffusion is provided on the bulged portion of the insulating member. Rotating electric machine. In the rotating electrical machine according to any one of claims 5 to 7,
A rotating electrical machine characterized in that a space for depositing brush powder diffused by centrifugal force from the slit is provided around or below the slit. In the rotating electrical machine according to any one of claims 5 to 8,
A plurality of the slits are formed at a predetermined angle with respect to the rotation direction of the rotor. In the rotating electrical machine according to any one of claims 5 to 9,
The rotary electric machine according to claim 1, wherein the slit is formed for each commutator piece. In the rotating electrical machine according to any one of claims 4 to 10,
Both the width and the length of the slit are provided at 1.8 mm or more.

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