Research On The Sensorless Control Technique Of Permanent Magnet Synchronous Motor Based On The Method Of High-frequency Signal Injection And Sliding Mode Observer

Permanent Magnet Synchronous Motor(PMSM) has been widely used in all kinds of electric drive control system for many advantage such as High efficiency, high power density, high power factor, wide speed range, stable and reliable operation. Vector control became one of the key technologies in the field of motor control, because of its high precision and high dynamic performance and high stability. In the vector control system, the accurate position and speed information of the motor is needed, Generally by mechanical sensor feedback to the system. However, the introduction of mechanical sensors increases the volume and cost of the system, but also brings a series of factors of instability to the system. In order to overcome this disadvantage, Sensorless control of PMSM was a hot issue in the are of electrical machine controls. The Sensorless Control Technique of Permanent Magnet Synchronous Motor Based on the Method of High-frequency Signal Injection and Sliding Mode Observer is studied in this paper.In this paper, Sensorless control is based on the id=0 vector control of PMSM, using SVPWM drive mode. The strategy is convenient, if a constant magnetic field, the torque output of the motor is proportional to the the q-axis current. In this paper, The rotating high frequency injection method is used in the low speed stage, and the sliding mode observer is used in the high speed stage, give full play to the advantages of both in their respective speed range. PLL Phase tracking technique is used to obtain the rotor position, and a good result is obtained. In the switching interval of the two estimation methods, the weighted calculation method is adopted to realize the effective transition from the high frequency injection method to the sliding mode observer. Because the system in sudden or sudden speed when the estimation error increases, easily lead to instability of the system, when the motor speed is changed, the S curve is adopted to make the speed planning, which can effectively reduce the estimation error and increase the stability of the system.In this paper, the simulation model is built in the Matlab/Simulink environment, and the simulation analysis of the rotor position and speed is carried out by the high frequency injection method and the sliding mode observer. The simulation results show that the proposed method can effectively estimate the rotor position and speed in the low or high speed range of the motor. The S curve velocity planning reduces the estimation error and improves the stability of the system when the speed changes. This paper also designs a thin permanent magnet synchronous motor controller, a control system platform is built, and in the LabVIEW environment, developed a motor control software. The experimental results show that the effectiveness of the proposed control strategy.