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321型启动机电刷端盖内安装了两个半圆形胶木制动垫圈,其作用是,当切断启动机电源后,使电枢迅速停转,以尽量减少电刷与换向器之间的磨损。有些
321 type starter motor brush cover installed two semi-circular bakelite brake washers, its role is to cut off the starter power, the armature quickly stopped to minimize the brush and the commutator between Wear and tear some