| 摘要 |
PURPOSE:To remove the black coating produced on the sliding surface of the brush of a rotary electric machine so as to prevent the output decrease thereof, by uniformly adding to the brush material an amorphous compound which includes silica of a predetermined weight percentage and of a normal grain diameter as a main compound. CONSTITUTION:To the brush material of rotary electric machine, which has as a main compound a mixture of a metal and graphite, an amorphous compound is uniformly added which includes as a main compound silica of 0.02-2wt% to the gross weight of the brush and of the normal grain diameter of 1-100mmu. By use of the brush having such a constitution, the black coating produced on the sliding surface of the brush can be removed so that the output decrease in the machine is prevented. |
