| 摘要 |
An alternator for use in an automobile comprises a first frame, a second frame, a stator, a shaft, a rotor, a current supply system and fans. The shaft is rotatably coupled to the first frame and the second frame, and extends outwardly beyond the first frame. The current supply system has a pair of slip rings, a pair of brushes and a brush holder. The slip rings are fixed to the shaft, and are electrically connected to a coil of the rotor. The brushes are urged against and in slidable contact with the slip rings, respectively. The brush holder is fixed to the first frame for retaining the brushes; and has a slip ring shield portion for covering and protecting the slip rings. The slip ring shield portion has openings which allow dust produced by the wearing of the brushes to be blown by the action of fans.
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