Based On Permanent Magnet Synchronous Motors Reference Flux Vector Calculation Direct Torque Control

Permanent magnet synchronous motors because of its small volume, high efficiency, fast response, high precision, good reliability and strong anti-jamming ability, and many other advantages, in all kinds of high performance system is widely used. Permanent magnet synchronous motor direct torque control becomes one of the hot spot in the current motor control field. This paper mainly revolves around the reference flux linkage vector calculus (RFVC) direct torque control of permanent magnet synchronous motor, mainly solved how to set the gain in torque controller, to provide a basis for how to set the gain.This paper introduces the mathematical model of permanent magnet synchronous motor and the direct torque control principle, studies reference flux linkage vector calculus (RFVC) direct torque control, through deriving the transfer function of torque control system, obtains the method of setting PI controller gain. It is presented that a reference flux vector calculation direct torque control system with a speed controller using different proportional and integral coefficients, and a novel torque-limiting method is recommended.The direct torque control system, make full use of MATLAB/SIMULINK simulation technology, establishes the simulation model of permanent magnet synchronous motor direct torque control system. Through setting the different gain of torque PI controller, studies the simulation experiment, the results show that the conclusion about RFVC direct torque control system are correct. Finally, using the DSP chip TMS320F2812digital signal processor, constructs the permanent magnet synchronous motor RFVC direct torque control system.By theoretical analysis and simulation experiment, the results show that the relation between the gain and damping ratio、natural frequency are correct. With a speed controller using different proportional and integral coefficients has good static and dynamic characteristics, it is not only insensitive to motor parameters but also has a good robustness to the outside disturbance.