Research On PMSM Control Strategy Of Mine Electric Locomotive Based On Sensorless Technology

At present,permanent magnet synchronous motors(PMSM)for mining motor vehicles use traditional mechanical sensors to detect rotor position,but mechanical sensors are expensive,difficult to install,difficult to maintain.The underground coal mine environment is harsh and the roadway is narrow,which is not conducive to the use of mechanical sensors.Sensorless technology can overcome the shortcomings of traditional mechanical sensors,detect the rotor position of the motor,and the mining motor car runs slowly and at a stable speed,which provides convenience for the application of sensorless technology.Therefore,this paper studied focuses on the sensorless technology of the zero-speed,medium-high speed and full-speed conditions of the permanent magnet synchronous motor for mining electric vehicles.Aiming at the problem that the position angle is difficult to detect when the PMSM of mine motor vehicle is working at zero speed,the sensorless technology based on high frequency pulse signal injection method is studied.The good control effect is verified by simulation analysis.Due to the slow response of the system,the filtering process has been improved.Due to the frequent and frequent fluctuations in the rotational speed,a sliding mode speed controller was used instead of the PI regulator.The simulation results show that the improved high-frequency pulse signal injection method based on sliding mode controller greatly improves the response speed and stability of the system.The sliding mode observer method has the disadvantage of buffeting when working at high speed in the PMSM of mining electric vehicle.The extended Kalman filtering method requires a huge amount of calculation.The sensorless technology based on model reference adaptive method is studied and analyzed by simulation.It has proven its good control effect.Aiming at the problem of large fluctuation of speed,the adaptive law structure is improved.At the same time,the simplified first-order ADRC is added due to the problem of poor anti-disturbance after the system suddenly loads.The simulation results show that the improved model reference adaptive method based on the auto disturbance rejection controller greatly improves the anti-disturbance of the system and reduces the speed fluctuation.When working in the full speed range of the PMSM for mining electric vehicles,it is not possible to use one method for control.The high frequency pulse signal injection method and the model reference adaptive method are used together.Because these two methods will fluctuate during switching,a composite weighted control strategy is designed,and its good control effect is verified by simulation analysis.