| 摘要 |
PROBLEM TO BE SOLVED: To provide a motor which can achieve a significant dimensional reduction and weight reduction, while its output is not reduced, and to provide a motor-driven apparatus such as an electrical apparatus, a motor-driven tool, etc., which can realize the dimensional reduction and weight reduction by employing the motor. SOLUTION: Lengths in the rotational direction of parts of brush segments 38 and 39 which are brought into contact with commutators 42 are not longer thanπ×A/20 (where A denotes the diameter of the commutator), and the number of commutator segments short-circuited by the brush segments 38 and 39 is minimized, to avoid the reduction in output.
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