Research On Vector Control System Of Permanent Magnet Synchronous Motor Based On Fuzzy Control And Positionless Sensor

The rapid development of power electronics technology and the application of microprocessors have made AC speed control systems have better control performance,and permanent magnet synchronous motor servo systems are also developing in the direction of high control accuracy and wide speed control range.As the core component of AC speed regulation system,the application prospect of permanent magnet synchronous motor will be more broad.In the control system of permanent magnet synchronous motor,vector control system is widely used.The controller in PMSM(Permanent Magnet Synchronous Motor)vector control system generally adopts classic PI control.With its simple structure and convenient parameter modification,it becomes the most extensive regulator in the control system.Since the traditional PID control is essentially a linear control scheme,the conventional PID parameter tuning method often relies on the mathematical model and engineering experience of the controlled object,and needs to be adjusted in the experiment.Therefore,for the nonlinear,multivariable and time-varying PMSM control objects,the PID parameter setting effect is not good,the adaptability to the operating conditions is not strong,and it is difficult to meet people’s high-performance control requirements for the PMSM speed control system.In the PMSM vector control system with high accuracy and excellent control performance,the most important thing is the precise control of speed and position.Therefore,it is necessary to install a position sensor on the rotor shaft to obtain the rotor speed and position information of the motor.The position sensor increases the space size of the motor,the position detection circuit is susceptible to external interference,and the linearity and resolution of the position sensor are susceptible to temperature and electromagnetic interference,making the position detection less reliable.In order to solve a series of problems caused by position sensors,it is of great significance to study the application of sensorless control technology with high precision and strong anti-interference to PMSM control systems.In response to the problems raised above,the research content of this article is as follows:1.For the permanent magnet synchronous motor control system,in order to obtain excellent control performance,this paper combines fuzzy control with traditional PI control,and designs a fuzzy PI controller instead of vector control The regulator of the system realizes the online adjustment of PI parameters through fuzzy control,so that the control system has the best PI parameters under different working conditions,and improves the dynamic performance of the permanent magnet synchronous motor control system.2.In the Simulink environment of Matlab,a model of the vector control system of permanent magnet synchronous motor based on fuzzy PI control is built,and the speed regulation performance of the permanent magnet synchronous motor under fixed PI parameters is compared and analyzed.3.The program of fuzzy PI control is written on the software platform Code Composer Studio,and the experiment of PMSM vector control system based on Fuzzy PI control is realized on the 2.2k W PMSM vector control experiment platform in the laboratory,which verifies the advantages of fuzzy PI controller compared with classical PI controller.4.Starting from the mathematical model of the permanent magnet synchronous motor under high frequency excitation,on the basis of the relevant theoretical derivation,a model of rotor position detection of the permanent magnet synchronous motor based on the pulsed high frequency signal injection is built,which is verified by simulation The correctness of the method.