High performance drive of single-phase induction motor

Until recent years, most of the research into motor drives focused on the high performance drive of the three-phase induction motor, and that of the single-phase induction motor (SPIM) was of little interest. The SPIM is widely used at low power levels because it has simple construction and economic advantage. In general, such machines have both a main and auxiliary winding. Conventionally, these windings are fed by only one single-phase source, and the speed of the motor is not controlled. The SPIM with an auxiliary winding can be treated as an asymmetrical two-phase machine. In this paper, the space vector equivalent circuit of the SPIM is derived. For vector control of the SPIM, the stator current must be decoupled into a flux producing component and a torque-producing component. To accomplish decoupling control, the conventional method requires complex modeling and large computation time. The authors proposed an equivalent circuit referred to the rotor side; in this case, only the stator resistances in the direct axis and the quadrature axis are different from each other and the other parameters are represented to be equal. Thus the decoupling of the stator current is similar to that of the three-phase induction motor. In this paper, a novel vector control system for the single-phase induction motor is proposed. To verify the feasibility of this scheme, experimentation is carried out. The results prove the excellent characteristics for the dynamic response, which confirms the validity of the proposed system