Study Of Space-Vector PWM Controller For Two-Phase Asynchronous Motors System Based On DSP

In this paper, a novelty space vector pulse width modulation (SVPWM) technique for the two-phase inverter-fed asynchronous motors system is proposed, which can be widely employed in the low or middle power level field. Integrated mathematical model is set based on the whole system by Kron transform. On the base of analysis of the SVPWM controller for two-phase asynchronous motors in home and abroad, the SVPWM technique by using four space voltage vectors and divided eight sectors is advanced. The controller parameter and formulation are deduced. An optimized modulation index is proposed for the motor having rotary circle magnetic field. Meanwhile, the Switching Sequence is determined and the waveforms of the output voltage of the two-phase inverter are shown. Simulator program is designed and the simulated waveforms of the voltages, currents, speed and torque are shown using this method of SVPWM. Through compared with other methods, this novelty technique can reduce the torque ripple and minimize the ripple content of the out currents. The system of experiment consists of DSP controller, power drive device, inverter-fed device, and a low power tow-phase induction motor. The experimental SVPWM signals every sector is shown and consistent with the theory.