Research On Sensorless Vector Control System Of PMSM For Wide Speed Range

Permanent Magnet Synchronous Motor(PMSM)is a kind of Motor with high power factor,simple structure,reliable action and easy to control.It has a wide range of applications in various fields of production and life.Accurate rotor position information is a key step in the process of high performance magnetic field orientation control of the magnet magnet synchronous motor(PMSM).In practical applications,position sensors are usually used to obtain rotor position information.However,the position sensor will inevitably increase the manufacturing and maintenance budget of the system,increase the size and weight of the motor,and there are also some problems in the stability and reliability of the long-term use.The research objective of this thesis is to develop a rotorless position/speed sensorless control system,whose performance can be comparable to that of sensor-based PMSM control system.Different sensorless control methods are developed for different speed regions.Based on the design method of terminal sliding mode surface,a new sliding mode observer was designed to progress the accurateness of rotor position estimation and the performance of PMSM control system in the middle and high speed domain.In the low speed domain,the high performance square pulse injection method is introduced to solve the problem of poor loading performance of the new sliding mode observer,and the phase-locked loop is introduced to improve the dead zone of the arctangent function in the high frequency injection algorithm.The simulation models of the high frequency injection algorithm and the new sliding mode observer were built by the software in experiment platform respectively,and the observation performance of the two control schemes in the speed domain was verified.Based on TMS320F28377,an experimental platform of PMSM sensorless control system was built,and the driving circuit was designed with DSP internal function module.The main program and main interrupt program were written for realizing sensorless control methods in medium and high speed and low speed domains,and the speed regulation system of permanent magnet synchronous motor in wide speed domain was established.The correctness and feasibility of the proposed control scheme are verified by comparative experiments under different speed domains and different working conditions...