Research on Loading System Based on SVPWM Direct Torque Control

摘要

Before the motors leave the factory, load experiment must be done. In this paper, a loading system based on SVPWM direct torque control for permanent magnet synchronous motor is proposed to solve the problem that the current load test platform has low loading accuracy and can't load the repulsive loads. According to the type of mechanical load of the motor undertakes in practical applications, different control strategies are proposed to accurately simulate the mechanical load under different working conditions accurately. Speed cut-off negative feedback is added for speed limit protection issues. SVPWM direct torque control can reduce the torque ripple and speed up the response speed. The current ideal is used to calculate the set value of the flux linkage of the loading system, which can improve the efficiency of torque output, avoid the demagnetization and flux saturation phenomenon and ensure the safe operation of the system. Based on this theory, the simulation and experiment prove that the method can simulate the mechanical load quickly and accurately. Besides, the torque output has high efficiency.