Built-in Permanent Magnet Synchronous Motor Fuzzy PI Weak Magnetic Control

Interior permanent magnet synchronous machine(IPMSM)is widely used in the speed control drive system,such as electric vehicles and machine tool spindle drive system,because of its high power density,high reliability and high efficiency.IPMSM must adopt the flux-weakening control strategy to meet the requirements of wide range speed regulation.It is of great significance to study the flux-weakening control of permanent magnet synchronous machine and effectively broaden the speed operation range,which has been a hot issue of scholars both at home and abroad.Therefore,this paper aims to solve the problem of poor robustness and weak dynamic performance of the flux-weakening range in the traditional control strategy,and improve the control performance of the built-in permanent magnet synchronous motor in the flux-weakening range.Aiming at the problem of poor robustness and poor dynamic performance of flux-weakening control in traditional control strategy,a new control strategy based on feedforward control and fuzzy-PI feedback control is proposed in this paper.Firstly,in order to reduce the amount of computation and improve the speed of operation in the practical application,we use Taylor series to simplify the traditional control algorithm,and get the expression of control algorithm in constant torque area and constant power area.Secondly,because of the actual condition,the parameters of the motor are interference by load,temperature changes,the actual operation of the motor will change with the parameters of the motor,so we obtain d axis current compensation value by the fuzzy-PI feedback control,and then solving the problem of running point drift caused by the simplified formula and the change of the parameters during the operation process.Finally,on this basis,a smooth switching strategy based on the weighted function idea is proposed to realize the smooth switching between constant torque area and constant power area.Finally,the system simulation model of built in permanent magnet synchronous motor for 20kW electric vehicle is built,and the experimental control platform of IPMSM flux-weakening control system based on TMS320F28335 DSP is developed.Simulation and experimental results show that the proposed control strategy can suppress the influence of motor parameters on the control system,improve the dynamic performance of the flux weakening controller,and realize the smooth switching from constant torque region to constant power region.