A V/f= cte Control Drive for Permanent Capacitor Single-Phase Induction Motor

Poor performance of the convectional household induction motors which used in home appliances such as refrigerator، cooler، laundry، washing machines، fans، hand-held power tools، and automotive window lift is generally caused by two main reasons. Firstly، they have high starting current which causes significant voltage drop، and secondly، they operate in a single speed mode and not in variable speed. In many home appliances، traditionally a discrete speed control method is used by changing the number of the poles. A proper solution for these problems can be achieved by using control drive systems. In this paper، a simple scalar control method is applied to control the speed of a permanent capacitor single phase induction motor (PCSPIM). The philosophy of this method is on the basis of simultaneous system’s frequency and voltage control on the machines terminals subject to V/f=cte. Simulation and practical implementation results clearly show the effectiveness of the simple V/f =cte speed control method for home appliances.