| 摘要 |
PROBLEM TO BE SOLVED: To control abrasion to be caused by the fusion of metal brushes with a commutator, by fixing a specific value or lower the surface roughness Rave of the electrical sliding surface of a blanked continuous clad thin sheet formed by blanking a continuous clad conductor comprising noble metal and/or Cu base alloys. SOLUTION: A continuous clad thin sheet 1 comprising a noble metal base alloy 'a' embedded on a Cu base alloy base sheet 'b' is blanked to separate a continuous blanked clad thin sheet 2. The surface roughness Rave of the electrical sliding surface of a brush assembled unit 3 with a brush holder 'c' joined is fixed to 60 nm or lower with the mechanical transfer of a super mirror surface. This mechanical transfer of a supper mirror surface is effected to smooth the electrical sliding surface with commutator pieces, without changing the spring elasticity and the dimensions of the given shape of the brush assembled unit 3. As a result, in an DC motor for low voltage and low current, it is possible to control the abrasion of a brush arising from the abrasion to be caused by the fusion of the metal brush with the commutator.
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