Carbon brush

A carbon brush and brush technology, which is applied in current collectors, electrical components, electromechanical devices, etc., can solve problems such as engine efficiency reduction, and achieve the effect of suppressing efficiency reduction, realizing EMI performance, and realizing long life.

Inactive Publication Date: 2013-01-09
TOTANKAKO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the SiC powder slides and grinds the surface of the commutator little by little, the engine efficiency decreases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] First, after blending 77% by mass of artificial graphite powder (average particle diameter: 20 μm) as an aggregate and 23% by mass of epoxy resin (thermosetting resin) as a binder, non-preheated Shaped mesophase carbon powder (average particle size 20μm, refer to figure 2 ). It should be noted that the mesophase carbon powder used was obtained by heat-treating coal tar pitch, solidifying, pulverizing, infusible, and adjusting the particle size. At this time, the ratio of the mesophase carbon powder to the total amount of the artificial graphite powder and the epoxy resin was 1% by mass. Then, kneading was carried out at room temperature for a predetermined time (60 minutes) so that the artificial graphite powder, the resin, and the mesophase carbon powder were uniformly mixed.

[0072] Next, this kneaded product was pulverized to an average particle diameter of 80 μm or less to prepare a molding powder for brush molding. Using a cold press, at 1 ton / cm 2 After the ...

Embodiment 2

[0075] Use approximately spherical mesophase carbon powder (average particle size 25 μm, refer to image 3 ) instead of the amorphous mesophase carbon powder, a carbon brush was produced in the same manner as in Example 1 above.

[0076] Hereinafter, the carbon brush produced in this way is called this invention brush A2.

Embodiment 3

[0078] The approximately spherical mesophase carbon powder used in the above-mentioned Example 2 was preheated at 600° C. for 5 hours (average particle size: 26 μm, Figure 4 Reference) was used instead of the amorphous mesophase carbon powder, and a carbon brush was produced in the same manner as in Example 1 above.

[0079] Hereinafter, the carbon brush produced in this way is called this invention brush A3.

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Abstract

Provided is a carbon brush such that it is possible to improve motor efficiency and to achieve a prolonged service life. Disclosed is a carbon brush (1) which is pressed against a conductive rotating body (2) and which is characterized by containing mesocarbon powder and an aggregate containing at least carbon as one component. Preferably, the mesocarbon powder has a roughly spherical shape, and is subjected to pre-heating treatment. Moreover, the temperature for the pre-heating treatment is preferably 500 DEG C to 700 DEG C inclusive.

Description

technical field [0001] The present invention relates to a carbon brush for electric motors using a commutator for home appliances, electric tools, and automobiles, and more particularly to a carbon brush incorporated into a small engine using a commutator. Background technique [0002] The miniaturization, larger capacity, and higher output of electric motors are advancing. For example, the motors used in electric vacuum cleaners are required to be smaller and have stronger suction power. Therefore, the outer diameter of the fan of the engine is reduced to rotate at an ultra-high speed (over 30,000 rpm). In such an ultra-high-speed rotating engine, it is necessary to maintain normal electrical contact and improve engine efficiency by maintaining a good sliding state between the carbon brushes for electric machinery and the commutator, which is a conductive rotating body. In addition, it is necessary to prolong the life so that brush replacement is not required during use of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K13/00H01R39/26
CPCH01R39/26H01R39/025H01R39/20
Inventor 香川佳一前田孝藤村拓司白川秀则
Owner TOTANKAKO
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