| 摘要 |
An apparatus is provided for controlling a single phase induction motor having a main winding, an auxiliary start winding and a start capacitor in series with the start winding. The apparatus comprises a sensing means for sensing the voltage across the main winding and across the start winding of the induction motor, a means for detecting a condition of the sensed voltages across the main and start windings that is indicative of the phase angle between the voltage across the main and start windings. The apparatus comprises a switching means for disconnecting the start capacitor from the start winding when the switching means is energized, and a microcomputer for energizing the switching means to disconnect the start capacitor from the start winding in response to determining when the phase angle between the voltage across the main winding and the start winding increases by more than a predetermined amount.
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