On the selection of single phase induction motors for low cost speed controlled drives

Operating single phase induction motors across a wide range of speed and load with high efficiency is still of interest. In the paper at hand the suitability of several different capacitor run single phase induction machines for phase control, integral (half) cycle control or integral switched cycle control is investigated. The induction machine's model's electrical and mechanical parameters are estimated and simulations are carried out in order to investigate the influence of the parameters on total input power, torque and losses. Measurements are carried out recording rotor speed and total input power comparing phase control and integral switched cycle control at approximately the same operating points. From these data a simple method is derived that can be used for selecting machines for low cost speed controlled drives. The experimental results verify the proposed method.