Sensorless Vector Control Of Permanent Magnet Synchronous Motor Based On ARM

In the AC speed regulation system,the permanent magnet synchronous motor has a series of advantages such as small volume,light weight,high efficiency and high power factor;therefore,the permanent magnet synchronous motor has been widely used in industrial control.However,when the oil pumping system in the oil field or the pitch system in wind power generation operates under harsh conditions in the external environment,the speed PI controller in the conventional double closed loop system will be subject to certain limitations.such as poor anti-interference and slower dynamic response,etc.In order to improve the performance of the permanent magnet synchronous motor speed control system,the sliding mode approach law will is used to improve the speed PI controller in the double closed loop system.At the same time,in order to make the operation of the permanent magnet synchronous motor vector control system more stable,it is necessary to accurately acquire the information of the rotor.However,taking into account the use of mechanical sensors will increase the cost of the system and it is also difficult to install and maintain;therefore,the sensorless control technique,that is,a sliding mode observer control algorithm is used to acquire the rotor information.First of all,for the permanent magnet synchronous motor vector control system can be normal operation when subjected to external interference and can quickly return to the original stable state,but also suitable for high-performance speed applications;this requires speed in the double closed-loop system The ring is improved,so the control method of the sliding mode reaching law will be used to achieve the control of the speed loop.For a permanent magnet synchronous motor sensorless vector control system,a sliding mode observer control algorithm will be used to obtain rotor information.In traditional sliding mode observers,discontinuous symbol functions are generally used as control functions to obtain back-EMF information.Since actual switching control cannot achieve idealization,it will cause lag in time or space,resulting in system chattering.In order to effectively suppress this chattering phenomenon of the system,a continuous saturation function is used instead of the discrete symbol function in the traditional sliding mode observer as a control function to obtain back electromotive force information;at the same time,a phase-locked loop system is used to estimate the rotor's Corner position.This will significantly improve the accuracy of acquiring the rotor position angle.Then,the simulation model of the permanent magnet synchronous motor vector control system based on the sliding mode speed controller and the sensorless vector control system ofthe permanent magnet synchronous motor based on the improved sliding mode observer are established on MATLAB/SIMULINK.By comparing the simulation waveforms of the vector control system of the sliding mode speed controller and the conventional speed PI controller,the vector control system of the sliding mode speed controller has the advantages of good stability,fast dynamic response.Compared with the improved waveform simulation of the sliding mode observer and the traditional sliding mode observer for the permanent magnet synchronous motor sensorless vector control system,the sensorless vector control system of the permanent magnet synchronous motor based on the improved sliding mode observer has more accurate information for obtaining the rotor,more stable system,and stronger carrying capacity and other advantages.Finally,the hardware platform of the system is built with ARM as the core controller and the stator current waveform of the motor is given.