| 摘要 |
PROBLEM TO BE SOLVED: To control the excessive rise of the internal pressure of a stator case, and also to prevent the entrance of dust or moisture from outside. SOLUTION: A vent hole for sealing a case which stores a permanent magnet is made, and a given length of ventilating pipe is coupled with the vent hole. Since the air goes out or goes in via the vent hole even if the internal pressure of the stator case goes up by any cause such as consecutive braking action, etc., the pressure within the stator case becomes always equal to the pressure (atmospheric pressure) outside the case. Moreover, the open end of the ventilating pipe can be arranged in an optional position by the way of drawing around the ventilating pipe. Thus, it becomes possible to easily prevent dust or water from entering the stator case from outside. COPYRIGHT: (C)2004,JPO
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