| 摘要 |
An electric power tool having a housing, a fan and a motor including brushes, a commutator, an armature, and a stator. The brushes are mounted on a brush board which fits closely adjacent the commutator. The stator comprises a shell and circumferentially spaced permanent magnet segments secured to the shell, air passages being formed by the spaces between the segments. Openings are provided in the housing to permit air to be drawn in by the fan, the air being channeled by the housing and the brush board over the commutator and through the passages in the stator, thus effectively cooling the commutator and the armature of the motor.
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