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Brush, commutator, and commutator device

A technology of commutator and commutator sheet, applied in circuits, current collectors, electrical components, etc., can solve problems such as difficulty in further improving rectification and durability

Inactive Publication Date: 2009-05-27
DENSO CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to further improve rectification and durability

Method used

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  • Brush, commutator, and commutator device
  • Brush, commutator, and commutator device
  • Brush, commutator, and commutator device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0047] 1 and 2, a brush 4 and a commutator 5 of the first embodiment are used for a DC motor as a rotary electric machine. The DC motor 1 has a stator 2 and a rotor 3 , wherein the stator 2 is provided with permanent magnets or field coils, and the rotor 3 is provided with a plurality of armature windings 31 . A pair of brushes 4 are provided on the stator 2 to supply direct current. The commutator 5 is connected to the rotor shaft 32 of the rotor 3 . The commutator 5 has a plurality of commutator segments 6 which are connected to armature windings 31 respectively, as shown in FIGS. 4 and 5 .

[0048] As shown in FIGS. 2 and 3 , the commutator 5 is of a flat type and placed on the axial end surface of the rotor 3 so as to be in contact with the brush 4 . Specifically, the commutator segments 6 are mounted on a disc-shaped resin body member 51 . The commutator segments 6 extend radially from the center 511 of the resin body member 51 . In addition, gaps 60 are formed betwee...

no. 2 example

[0067] Referring to Figures 6 and 7, the DC motor 1 of the second embodiment has a pair of brushes 4, each of which is composed of two resistive layers, and the commutator 5 has a plurality of commutator segments 6, each commutator segment Consists of a single layer. Specifically, each brush 4 has a low-resistance layer 41 made of a first material and a high-resistance layer 42 made of a second material, wherein the second material has a higher resistivity than the The resistivity of the first material.

[0068] The first material contains a carbon material and a binder. The second material contains a carbon material, a binder, and boron nitride as an inorganic substance. Here, the mixing ratio of boron nitride is higher than 20wt% with respect to the total weight of the second material.

[0069] The DC motor 1 of the second embodiment is used in a fuel pump of a vehicle, and the rotor 3 of the DC motor 1 rotates in the direction R. As shown in FIG. As shown in FIGS. 6 and...

no. 3 example

[0082] An example of the manufacturing method of the commutator 5 of the first embodiment and the brush 4 of the second embodiment will be described below.

[0083] The manufacturing steps of the commutator sheet 6 and the brush 4 with two resistance layers 41, 42, 61, 62 are as follows:

[0084] First, as a method of producing the second material, carbon powder such as graphite (for example, 20 wt% of natural graphite powder with an average particle diameter of 30 μm) and inorganic powder such as boron nitride (such as 75 wt% of hexagonal boron nitride powder, The average particle size thereof is 10 μm) mixed with each other. Then, novolac resin (eg, weight ratio: 15) is added as a binder into the mixed powder (weight ratio: 100), wherein the novolac resin is dissolved in methanol solution (eg, weight ratio: 30). In addition, the mixing is performed with a mixer, and thus a mixed material is produced.

[0085] After that, the mixed material was dried in a drier to evaporate...

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Abstract

In a commutator of a rotary electric machine, each of commutator segments has a low-resistive layer made of a low-resistive material and a high-resistive layer made of a high-resistive material having a specific resistance higher than that of the low-resistive material. The low-resistive material contains a carbonic material and a binder. The high-resistive material contains a carbonic material, a binder and an inorganic substance such as boron nitride. A mixing ratio of the inorganic material to the high-resistive material is more than 20 wt %. Alternatively, a brush, which makes contact with the commutator segments, can have the high-resistive layer and the low-resistive layer.

Description

technical field [0001] The present invention relates to a brush, a commutator and a rectifying device for use in rotating electric machines such as electric motors and generators. Background technique [0002] Generally, in an electrical machine such as a DC motor, a pair of brushes is provided on a stator and a commutator is provided on a rotor. In the rotor, multiple armature windings are respectively connected to multiple commutator laminations of the commutator. The pair of brushes in turn press against the commutator plates to supply current to the armature windings, thereby driving the rotor to rotate. [0003] However, the brushes and the commutator segments are in intermittent and repeated contact with each other. Consequently, the contact surfaces between the brushes and the commutator laminations may be subject to electrical wear due to intermittent conduction, and additionally to mechanical wear due to pressure contact. This electrical wear is caused by an elec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01R39/24
Inventor 滨松宏武村上洋一本保亮一清濑显三池田光男坂浦洋一中川慎也西尾诚
Owner DENSO CORP
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