| 摘要 |
An improved arrangement for controlling the speed and direction of rotation of a DC motor responds to a variable bipolar input signal. A bipolar threshold detector coupled to the motor is used for the selective triggering of a triac during the appropriate half wave polarity of an AC source. Triac failure is prevented by a protection circuit. The arrangement incorporates a speed servo and senses the voltage across the triac to detect the speed of the motor.
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