Research on positionless control of mining high force energy density permanent magnet direct drive integrated machine based on improved sliding mode observer

In order to realize sensorless control of mine high energy density permanent magnet direct drive integrated machine, improved sliding mode control is used to estimate rotor position and rotational speed. Due to the frequent switching of working conditions in the mine, the control system of the integrated machine is affected to a certain extent. In order to reduce the chattering effect caused by traditional sliding mode control, a sensorless vector control system with double closed-loop speed and current was built by adding phase-locked loop to improve the stability and observation accuracy of the control system. The simulation results show that the system has high state estimation accuracy, stable operation and fast response speed, which can cope with complex working conditions in mine, and is suitable for the mine with high energy density permanent magnet direct drive all-in-one.