Metal-graphite brush

A technology of metal graphite and electric brushes, applied in the direction of circuits, current collectors, electrical components, etc., can solve the problem of reducing the mountability of motors

Inactive Publication Date: 2007-01-17
AISIN SEIKI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, the mountability of the motor on the vehicle is further reduced, and there is also a problem of additional cost for solving electrical noise.
[0011] In the above-mentioned conventional motors having metal graphite brushes, sparks generated from the metal graphite brushes are the main cause of the various problems described above.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] The case where N,N-diethyl-N-methyl-N-(2-methoxyethyl)imino(trifluoromethylsulfonate) is used as the ionic liquid will be described. The ionic liquid is compatible with the following solvents at a volume ratio of 1:1: chloroform, methanol, ethanol, acetone, tetrahydrofuran, ethyl acetate, dimethylformamide, 1-propanol, 1-butanol alcohol, isoamyl alcohol. In addition, the ionic conductivity has 3×10 -3 A value around S / cm has the highest ion conductivity among ionic liquids.

[0081] In this embodiment, the volume of the ionic liquid is 1, methanol with a volume ratio of 0.2 and 1-butanol with a volume ratio of 0.4 are mixed to obtain an alcoholic solution of the ionic liquid. As the synthetic oil for dispersing the alcohol solution of the ionic liquid, polyalphaolefin is used, and its thermal decomposability and hydrolysis at 250° C. are only 2 to 3%. Its kinematic viscosity is 4cSt at 100°C, 17cSt at 40°C, and 2500cSt at -40°C. The pour point is -70°C. The viscosi...

Embodiment 2

[0085] As impregnating agent 21, a liquid in which methanol was emulsified in polyalphaolefin and then dispersed in fatty acid ester (Example 2) was used, and capric acid was added to methanol in Example 2 at 25°C Potassium to saturation solubility of the liquid.

[0086] The results are shown in Table 2. In Example 2, after 1000 hours of continuous operation, the wear rate of the brush 1 did not change significantly, but in the middle of 2000 hours of operation, the brush 1 was worn and the brush holder was damaged. However, in Example 2, it can be operated continuously for at least 1000 hours under this load condition, and thus can be used for many vehicle-mounted motors 10 .

Embodiment 3

[0087] In Example 3, the effect of increasing the conductivity of the sliding contact surface is obvious. Under this load condition, the brush 1 is still practical even after continuous operation for 3000 hours.

[0088] In addition, in any of the embodiments, the amount of wear is smaller than that of brushes of conventional products.

[0089] Example 2

Example 3

Existing example

Abrasion after 100 hours

0.2mm

0.1mm

0.3mm

Abrasion after 200 hours

0.3mm

0.2mm

0.5mm

Abrasion after 500 hours

0.7mm

0.4mm

2.5mm

Abrasion after 1000 hours

1.5mm

0.8mm

-

Abrasion after 2000 hours

-

1.5mm

-

Abrasion after 3000 hours

-

2.5mm

-

[0090] As described above, by impregnating the entire internal pores 19 of the metal graphite brush 1 of the present invention with the impregnating agent 21 having synthetic oil and conductive liquid, in addition t...

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Abstract

The present invention provided a metal graphite brush in which any spark discharge is hardly produced. A metal graphite brush 1 is made up of a sintered body having pores 19 on its surface and interior, and feeds a coil 17 in such a manner that the coil 17, wound around a core 9 provided on a rotor 2 of a motor, comes slidably into contact with an electrically connected commutator8 at a slidably contacting surface. Emulsion containing liquid that is vaporized in response to temperature rise due to contacting with the commutator 8 when a motor is operating, and solvent having a higher boiling point than that of liquid as well as causing the liquid to disperse is included within the pore 19.

Description

technical field [0001] The present invention relates to a metallic graphite brush for supplying power to a coil wound around a core provided on a rotor of a motor. Background technique [0002] In a brushed motor, the brushes are in sliding contact with the commutator to provide power. Then, the commutator is connected to a coil wound around a core provided in the rotor, and when the coil is energized, the rotor rotates due to attraction / repulsion with a permanent magnet disposed opposite to the rotor inside the case. [0003] In the motor having the above structure, since the brushes and the commutator are in sliding contact when the motor is driven, there is a problem of abrasion of the brushes on the sliding contact surface with the commutator. In the past, in order to suppress the wear of the brush when the motor is driven, research has been carried out to suppress the electrical wear / mechanical wear of the brush and the spark generated on the sliding contact surface of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K13/00H01R39/20H01R39/22H01R39/26
CPCH01R39/26H01R43/12H01R39/22
Inventor 小林博
Owner AISIN SEIKI KK
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