Asynchronous motor direct torque control technology is a new, high-performance AC speed regulation technology developed in recent years. It uses the working process of the voltage source inverter to control the stator flux to start or stop, that is, to adjust the angle between the stator flux and the rotor flux, so as to directly control the motor torque to obtain good dynamic performance. The paper first discusses the current status and development trend of direct torque control technology, expounds the basic principles of direct torque control, analyzes the commonly used circular flux trajectory control method, and introduces the design and implementation of the main modules of the direct torque control system in detail. On the basis of analyzing the dynamic mathematical model of AC asynchronous motors, torque and flux calculation equations, the problem of torque pulsation and speed fluctuation of asynchronous motors under direct torque control at low speed is analyzed. Based on the direct torque control method of asynchronous motors based on duty cycle control and discrete duty cycle control, the method of directly calculating the duty cycle is derived from the motor electromagnetic torque formula and the synthetic voltage vector theory, which greatly reduces the calculation amount of reducing torque pulsation without affecting the performance indicators of various aspects of the system, and facilitates calculation and use. Both methods have the advantages of simple system structure and small duty cycle calculation amount. The research results verify the correctness and effectiveness of the two methods. In the first method, a single neuron controller was added to improve the dynamic and static performance of the system. Then the direct torque control system using space voltage vector modulation was studied. The simulation results show that this method can effectively reduce torque pulsation and improve system performance. A direct torque control hardware experimental platform was built with TMS320F2812DSP as CPU, and the hardware circuit was debugged. The relevant software flow chart and program list were written.
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