Position sensor-less control strategy of permanent magnet synchronous motor for dual observer LADRC

A control strategy of cascaded LADRC without position sensors is proposed to address the problem of low observation accuracy of permanent magnet synchronous motors. On the basis of the traditional LADRC controller, an additional state observer is added to form a dual observer LADRC control strategy, which is combined with sensorless to improve the observation accuracy of permanent magnet synchronous motors. Finally, the feasibility of the strategy is verified through simulation. The simulation results show that the dual observer LADRC position free control strategy can improve the observation accuracy of permanent magnet synchronous motors.