| 摘要 |
PROBLEM TO BE SOLVED: To stop a motor in a short time even when a control part can not recognize the present number of revolution of a rotor due to the abnormality of a rotation detection sensor or a power failure by applying braking energy to the motor. SOLUTION: When the rotation detection sensor 6 is out of order while the rotor 2 is rotated at a high speed, a direct current close to the allowable current of the motor 5 is passed through the motor 5, and the rotation of the rotor 2 is decelerated by direct current braking.
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