Starting process simulation of Smith single-phase capacitance motor

A transient mathematical model of Smith single-phase capacitance motor was established, and the starting process of Smith single-phase capacitance motor was analyzed. Smith single-phase capacitance motors due to wiring constraints, the maximum voltage of each phase winding is 0.577 times the supply voltage, unique values capacitor starting torque when starting small, dual-values capacitor start can effectively improve the starting torque, shortening start-up time, but double the number of capacitors. In view of this situation, proposed a new start wiring methods, not only to improve starting torque, but also to reduce the number of capacitors, reducing investment costs, improve operational reliability. The simulation program was complied according to the mathematical model by Matlab. The starting processes of some startup methods of Smith single phase motor are simulated and calculated by examples such as unique values capacitor startup method, dual-value capacitor startup method and the proposed startup method, and the simulation results of these methods are contrasted and analysed. Both verify the correctness of the proposed method.