| Under the context of energy crisis in the world now, it is the important issue to save energy and reduce the cost. Since most of energy is consumed by the motors, it has been a worthy matter to develop some ways of frequency control of motor speed. Compared with three-phase motors, the single-phase induction motor has such advantages of simple structure and low cost that it is used widely in the field of industrial control,especially in the sector of household appliances.This paper firstly presents various control methods of single-phase motor, and introduces its working mechanism and starting method. And then the control scheme is tested based on space vector PWM control method and proved the feasibility of this control theory; At the same time the hardware circuit of single inverter was designed based on digital chip,then Space Vector Pulse Width Modulation(SVPWM) procedure was compiled by using C language. With adapting C8051F020 from CYGNAL Company as controller, this system can not only meet real-time control requirement of the single-phase motor, but also make the hardware circuits simpler.The main circuit,switching power supply circuit and control circuit of the system is discussed in the paper in detail. The software part consists of main program, and in order for modify and port conveniently the process is divided into module. Compared to SPWM control method Which is mature currently,SVPWM shows more excellent performance. Experiment proved that we could achieve good result to control single-phase motor by the use of SVPWM. |
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