| 摘要 |
PROBLEM TO BE SOLVED: To provide an electric commutator brush that makes it possible to reduce electrical loss without impairing the sliding property. SOLUTION: The electric commutator brush is of a three-layered structure and comprises a high-resistance layer 1, a medium-resistance layer 2, and a low-resistance layer 3. It is so constructed that a lead wire 4 is buried in the low resistance layer 3. There is no special restriction on the resistivity of each layer as long as the relation of high-resistance layer 1 > medium-resistance layer 2 > low-resistance layer 3 holds. However, the resistivity of the high-resistance layer 1 is preferably two to 20 or so times the resistivity of the medium-resistance layer 2. The resistivity of the low-resistance layer 3 is preferably≤2/3 of the resistivity of the medium-resistance layer 2. COPYRIGHT: (C)2005,JPO&NCIPI
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