| 摘要 |
PURPOSE: A motor is provided to prevent a vibration of a shaft owing to a clatter and torque and rotational frequency variations by forming a hollow in an axis direction of a shaft. CONSTITUTION: A shaft(11) has a penetration hollow(28) whose inner part is penetrated in an axis direction, and transfers a rotary power. A stator(12) generates magnetization according to an external power and covers rotators(13,15) for surrounding the shaft(11). A motor case(17) is configured to protect the rotators(13,15) and the stator(12) from the exterior. A ball bearing(16) is formed between the motor case(17) and the shaft(11) to reduce the friction with the motor case(17) when the shaft(11) is rotated.
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