Graphitic brush, and motor having graphitic brush

A graphite and motor technology, applied in circuits, current collectors, electrical components, etc., can solve the problems of easy wear and tear of graphite brushes, shortened motor life, and increased wear and tear

Inactive Publication Date: 2007-02-14
AISIN SEIKI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the sliding friction coefficient of the sliding contact surface increases, and the graphite brush becomes easy to wear
[0008] Therefore, when the above-mentioned conventional graphite brush is used at high temperature, the amount of wear per usage time becomes larger than when it is used at normal temperature. As a result, the life of the motor with the brush is shortened. short question

Method used

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  • Graphitic brush, and motor having graphitic brush
  • Graphitic brush, and motor having graphitic brush
  • Graphitic brush, and motor having graphitic brush

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] A continuous operation test of the motor 10 was performed using a graphite brush 1 impregnated with ethylene glycol having a boiling point of about 198° C. as the liquid 21 . Also, for ethylene glycol, the temperature at which the vapor pressure reaches 18mmHg is 105°C, and the temperature at which the vapor pressure reaches 355mmHg is 175°C. The result is as Figure 8 It can be seen that the amount of wear can be reduced up to about 180°C, and the amount of wear increases as the temperature rises at an operating temperature above that. That is, up to about 100°C is the effect of moisture absorbed from the atmosphere, and up to 180°C is the effect of ethylene glycol. In addition, when the temperature exceeds 180° C., the vapor pressure of ethylene glycol further increases, and the time until it is exhausted is shortened, so the operating temperature increases, and the amount of abrasion of the graphite brush 1 increases. Therefore, the motor 10 using the graphite brus...

Embodiment 2

[0087]Using the graphite brush 1 impregnated with glycerin having a boiling point of about 290° C. as the liquid 21 , a continuous operation test of the motor 10 was carried out in the same manner as in Example 1. FIG. Also, glycerin has a vapor pressure of 180 °C at 18 mmHg and a temperature of 355 mmHg at 260 °C. The result is as Figure 9 As shown, the amount of wear can be reduced up to about 100°C and 200 to 250°C, and the amount of wear increases at operating temperatures in between. Similar to Example 1, up to 100°C is the effect of moisture absorbed from the atmosphere, and at 200 to 250°C is the effect of glycerin. However, at the temperature in between, the moisture evaporates before reaching 100 hours, and the evaporation temperature of glycerin is still low. Therefore, if the temperature becomes higher between 100 and 200°C, the time until the moisture is exhausted will be shortened, so the amount of wear will increase. . Therefore, the motor 10 using the graphi...

Embodiment 3

[0091] As a liquid 21, make a Figure 11 A graphite brush 1 is impregnated with a mixture of three glycol ethers having vapor pressure characteristics shown. Diethylene glycol dimethyl ether has a vapor pressure of 18mmHg to 355mmHg and a wide temperature range of about 55°C to 135°C. In addition, both terminal groups have methyl groups and are diethers, so they are the most thermally stable diethyl ethers. A kind of alcohol ether. Furthermore, it has hygroscopicity, and its molecular weight is 134.17, which is about 50% larger than that of glycerin, which is 92.09.

[0092] Triethylene glycol dimethyl ether has a vapor pressure of 18mmHg to 355mmHg and a temperature range of about 115°C to 190°C. In addition, both terminal groups are methyl groups and are triethers, so it is the most thermally stable dimethicone. A kind of alcohol ether. Like ethylene glycol dimethyl ether, it has hygroscopicity, and its molecular weight is 178.22, which is nearly twice as large as glyceri...

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Abstract

A graphitic brush which hardly wears irrespective of temperatures used and which copes with the problem of prolongation of life; and a motor having the graphitic brush. In the graphitic brush for feeding a coil wound on a core provided in the rotor of a motor, the graphitic brush consists of a sintered compact having pores in the surface and in the interior, the pores being impregnated with a liquid having a boiling point higher than that of water.

Description

technical field [0001] The present invention relates to a graphite brush for supplying power to a rotor of a motor, and more particularly to a graphite brush that is not easily worn even when the graphite brush is used at a high temperature of, for example, 100° C. or higher and satisfies a long life. brushes, and motors with graphite brushes. Background technique [0002] Electric motors with brushes are powered by sliding contact of the brushes with the commutator. In addition, a coil wound on a core provided in the rotor is connected to a commutator, and when the coil is energized, the rotor rotates by an attractive / repulsive force with a permanent magnet disposed inside the casing facing the rotor. [0003] In the motor having the above-mentioned structure, since the brushes and the commutator are in sliding contact when the motor is driven, there is a problem that the sliding contact surface wears out, and it has been an object to suppress the wear on the brushes when ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K13/00H01R39/22H01R39/26
CPCH01R39/22H01R39/26
Inventor 小林博
Owner AISIN SEIKI KK
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