| 摘要 |
PROBLEM TO BE SOLVED: To provide a motor capable of reducing voltage drop between a brush and a commutator, while restraining increase in frictional force therebetween. SOLUTION: A plurality lines of grooves 9b, extending in roughly peripheral direction are formed in a range, where a brush 8 comes into sliding contact with the outer periphery 9a of a commutator 9.
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