| 摘要 |
A controller for use with AC induction motors utilizes a microcontroller in conjunction with a triac to control the duty cycle of the AC power applied to the motor. A voltage sensing circuit provides signals to the microcontroller. The microcontroller is also coupled to the gate of a triac. The microcontroller automatically selects the appropriate parameters for most efficient motor operation based upon the motor power factor as determined by the time at which the voltage across the motor crosses zero and the voltage at the triac gate crosses zero.
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