Design of Direct Torque Control(DTC)system
based on DSP
ABSTRACT:In 1970’s,one method of AC induction motor control called Direct Torque Control(DTC)was raised. It was developed rapidly in the middle of 1980's, and it has been successfully applied to many occasions up to now. The thesis firs explains the basic running principle and the characteristic of the Direct Torque Control(DTC),and presents the arithmetic model of the three-phase asychronous motor as well as its basic equation of voltage and flux. The digital DTC system is implemented easily using TMS320F240,which is a fixed-point DSP and developed specially for motor&motion control by Texas Instruments Inc.In the thesis, the software of control system with no speed sensor is complied in DSP assembly language.This software has realized functions of the sampling of stator phase curt, calculating of the phase voltage;the observing of stator flux and the output of switching signal etc.
Keywords:Direct torque control ; DSP(Digital Signal Porcessor) ; Voltage space vertor ; Flux adjustment ;Torque adjustment ;Torque control system.