COMBINATION OF SPWM AND DTC IN ASYNCHRONOUS MOTOR SPEED CONTROL BASED ON HARMONICS ANALYSIS

摘要

Both SPWM and DTC(Direct Torque Control) are often used in asynchronous motor speed control. Although they have diverse advantages, there is still a common problem of high harmonic component. By studying the theories of SPWM and DTC as well as analyzing their harmonics in different speed ranges, a control method of combining SPWM and DTC together is put forth in this paper. The method can make use of their advantages of the two methods mentioned. So that it could also produce less harmonics in diverse speed ranges.