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Carbon brush for electric machine

A technology of electrical equipment and carbon brushes, applied in electrical components, circuits, current collectors, etc., can solve the problems of insufficiency, and achieve the effects of prolonging life, excellent lubricity, and low friction loss rate

Inactive Publication Date: 2003-08-27
TOTANKAKO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is still insufficient for the temperature rise caused by high output and high-speed rotation in recent years.

Method used

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  • Carbon brush for electric machine
  • Carbon brush for electric machine
  • Carbon brush for electric machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Mix 70 parts by weight of artificial graphite powder with an average particle size of 40 μm and an ash content of 0.2% or less, 4.7 parts by weight of tungsten disulfide powder, and 0.3 parts by weight of silicon carbide with an average particle size of 50 μm; 25 parts by weight of the phenol resin and methanol were mixed and kneaded at room temperature for 2 hours. Next, methanol is evaporated, dried, crushed to a particle size below 40 mesh, and molded into a size of 7×11×30 mm with a pressure of 200 MPa. Next, this molded body was fired at 600°C for 5 hours in a nitrogen atmosphere to obtain a brush base having a resistivity of 500 µΩ·m. This brush base was immersed in a copper sulfate solution oxidized by adding sodium hydroxide and potassium tartrate, and after adding an aqueous formaldehyde solution as a reducing agent, a 10 µm copper protective film was formed on the surface of the base. Furthermore, when the rotation direction of the commutator is clockwise (di...

Embodiment 2

[0041] Except that the artificial graphite powder with an average particle size of 15 μm, an ash content of 0.5% or less, high orientation and excellent formability was used as the graphite powder, a brush base with a resistivity of 100 μΩ·m was produced in the same manner as in Example 1, Next, samples were produced in the same manner as in Example 1.

Embodiment 3

[0043] 70 parts by weight of artificial graphite powder with an average particle diameter of 40 μm, 4.7 parts by weight of molybdenum disulfide as a self-lubricating agent, 0.3 parts by weight of silicon carbide powder as a grinding agent, bisphenol-based epoxy resin and acid anhydride-based hardened 25 parts by weight of additives are added together, mixed and kneaded at 130°C for 1 hour, shaped in the same way as in Example 1, and cured at 220°C to make a brush base with a resistivity of 2,000μΩ·m Thereafter, samples were produced in the same manner as in Example 1.

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Abstract

A carbon brush for an electric machine which comprises a carbon brush substrate containing a solid lubricant such as molybdenum disulfide, tungsten disulfide or the like and a grinding material such as alumina, silica, silicon carbide or the like and, formed on the whole surface thereof except that of the portion contacting with a commutator, a well conductive metal coating film; and the above carbon brush wherein the well conductive metal coating film is not formed and the carbon brush substrate is exposed in a part or the whole of at least one surface of the side planes perpendicular to the direction of rotation of the commutator.

Description

technical field [0001] The present invention relates to a carbon brush for electrical equipment, in particular to a carbon brush for electrical equipment that is used for commutator motors such as electric vacuum cleaners and electric tools and requires high output and high-speed rotation. Background technique [0002] In recent years, carbon brushes (hereinafter referred to as brushes) for electrical equipment used in commutator motors are being developed in the direction of particularly miniaturization, high output, and high-speed rotation. Therefore, there is a demand for a brush that can be made compact even in a state of high current density, can reduce frictional loss, and can cause a small temperature rise. [0003] However, the conventional brush tends to deteriorate the rectification characteristics, increase the frictional loss, and increase the temperature of the brush in the state of high current density and high-speed rotation. Therefore, compared with the mini...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01R39/26
CPCH01R39/26
Inventor 高桥和宏诧间政幸黑田浩二
Owner TOTANKAKO
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