Research On Sensorless PMSM Vector Control System

Three-phase permanent magnet synchronous motor(PMSM)has the advantages of small size,high reliability and high power density,and is widely used in high performance control systems.Permanent magnet synchronous motors must have highprecision real-time position information for high-performance control.However,traditional hardware sensor detection methods have disadvantages such as limited work,low reliability,and high cost.In order to improve the reliability of the permanent magnet synchronous motor control system and expand its application,research on position sensorless technology has become a trend.Firstly,this paper reviews the research status of the position sensorless technology of permanent magnet synchronous motor,and determines the control technology of the position sensor without permanent magnet synchronous motor in the medium and high speed and zero low speed working state.Secondly,the mathematical model and vector control strategy of permanent magnet synchronous motor are analyzed.The effectiveness of vector control of position sensor permanent magnet synchronous motor is verified by simulation.On this basis,the permanent magnet synchronous motor is analyzed at medium and high speed and zero.The principles of low-speed mathematical models,sliding mode observer methods,and high-frequency signal injection methods and their shortcomings.Furthermore,this paper uses the saturation function instead of the switching function in the middle and high speed stage to solve the chattering problem brought by the traditional synovial film;solve the problem of large computational complexity in the high-frequency signal injection method in the zero-low speed phase,and pass the saturation of the rotor magnetic circuit.The effect technology achieves the purpose of tracking the rotor poles.Then,in the simulation environment of Matlab/Simulink,the simulation model is built.In the middle and high speed stage,the chattering problem brought by the sliding mode observer method is explored,and the sliding mode observer method is used to estimate the rotor position and speed.The precision is higher and the observation effect is better.In the zero-low speed phase,it is verified by simulation that the pulsed high frequency injection method can improve the control performance of the rotor position observer.Finally,with TMS320F28335 as the main control chip,the hardware and software design of the permanent magnet synchronous motor position sensorless control system is carried out.Figure[82] Table[2] Reference[62]...