| 摘要 |
PURPOSE:To decrease vibration in rotation by making the number of motor exhaust ports, the number of motor inlet ports and the number of stator press fitting positions have no common divisor except one and making these numbers different. CONSTITUTION:A motor inlet port 22 is provided at a motor side bracket 13 and a motor exhaust port 24 is provided at an exhaust side bracket 11. A stator 12 is press fitted and fixed to the exhaust side bracket 11. The number of motor inlet ports 22, the number of motor exhaust ports and the number of motor 12 press fitting positions 23 don't have common divisor except one and these numbers are made different. Accordingly the rigidities, in the diameter direction, of the inlet side and exhaust side brackets of a motor can be made uniform and the vibration can be prevented from increasing.
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