Research On Position Sensorless Control Technology Of Permanent Magnet Synchronous Motor

With the rapid development of modern control theory,power electronics technology and semiconductor technology,setting sensorless Permanent Magnet Synchronous Motor control technology has been rapid development,the permanent magnet synchronous motor without position sensor technology because of its simple structure,easy maintenance,low cost,reliable,stable operation,etc,more and more application in the mainstream of servo system.In this paper,the permanent magnet synchronous motor(PMSM)is used as the carrier,and the rotor position is observed in real time by means of sliding mode observer.Firstly,the mathematical model of PMSM in two-phase static coordinate system is established,and the sliding mode observer is designed in this coordinate system.In order to improve the chattering problem caused by the sliding mode control,the saturated function was used to replace the traditional nonlinear symbol switching function and SIMULINK was used to verify that the improved sliding mode observer could effectively reduce the chattering.Secondly,in view of the traditional manual writing code of cycle is long,error-prone,consumes busywork problems such as long time,in this paper,Based on the Model design(Model-based Designed)software design method,this method is to write simple with high efficiency,train of thought clear,pay attention to the upper algorithm reduced the underlying repeated labor advantage,and using SIMULINK DSP2000 series hardware support package structures,without position sensor control software Model and the generated code,effectively reduce the error code and later maintenance costs.Finally,TI’s 28335 control chip and intelligent power chip(IPM)are adopted to form the hardware control platform.On this platform,the sensorless control algorithm designed and developed in this paper based on the model is tested,and the correctness of the algorithm and the validity of the model generated code are verified.