A CONTROL FOR A SINGLE PHASE AC MOTOR

摘要

This disclosure relates to control apparatus and particularly to a triggered switch connected in a first or controlled circuit and a trigger device connected in a second circuit. AC currents flow through the first and second circuits and there is a changing phase angle between the currents. Further, the current level in the second circuit changes. When the phase angle is greater than a certain value and the current level in the second circuit is above a certain level, the trigger device triggers the switch and energizes the first circuit. At angles below the value and current levels below the certain level, the switch is not triggered. Thus, the changing phase angle may be utilized to control the first circuit. The triggered switch is a thyristor type of device such as a triac, and the trigger device is preferably a reed switch. The control apparatus is particularly useful in controlling the start winding of a single phase AC motor.