Description: In the traditional direct torque control system,the system can produce torque ripple for that the system has margins of error in observation of stator flux position and the inverter switching frequency is not fixed.To solve this problem, this paper studies the control scheme based on flux observation error,which combine the voltage space vector pulse width modulation technology with direct torque technology.Voltage space vector selection of arbitrary phase and amplitude of the flux and torque,We can select Voltage space vector in arbitrary phase and amplitude by Error of the flux and torque so that torque ripple can reduce.The simulation results show that this control strategy is feasible, and the new PMSM DTC system is superior to the conventional one.
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