| 摘要 |
A system for insuring the correct rotational direction of a permanent magnet, bi-directional alternating current motor. A sensor driven by the output of the motor provides a time varying voltage signal that is differentiated and detected. The signal is then applied to either agree with or override the output control signal from a conventional motor control circuit. When the system operates in the correct direction, the signal complements the motor control. When the device tries to operate in an incorrect direction, the signal overrides the motor control signal.
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