Research On Induction Motor Indirect Vector-Control System Based On DSP

A indirect vector-control system of AC motor is presented in the thesis. By use of the digital signal processor(DSP) TMS320F2812 developed for motor control, it can realize uncoupling of stator's current and the algorithm of S VPWM. The main contents of this papers are as follows:In the first part analyse the mathematics of indirect rotor flux oriented vector-control system, study and compare the direct and indirect vector-control system, which are of the two control methods of vector-control system.In the second part aim at the disadvantage that the performance deteriorates of indirect vector-control system is mainly affected by the variation of rotor resistance, the method about real-time estimator of rotor time constant based on the stationary reference frame has been adopted and simulated by MATLAB.In the third part aim at the fact that the vector-control system is affected by the dead-time, the method based on a feedforward dead-time compensation approach has been adopted and simulated by MATLAB.In the fourth part the algorithm of SVPWM that is adopted by the system implements the motor speed regulation. It can generate less harmonics in the output current of power inverter and less losses of AC motor, reduce the output torque ripple and raise availability of DC supply voltage. Study on the control principle and the algorithm of SVPWM, and analyse of the two control methods of SVPWM.hi the last part design the hardware and software of the vector-control system.