Design of IPMSM Senseless Control System Based on Fast Adjustable Second Order Sliding Mode Observer

Taking Inter Permanent Magnet Synchronous Motor (IPMSM) as the research object, a sensorless control method for IPMSM based on an improved second-order sliding mode observer is designed. Aiming at the problems that the traditional super-twisting algorithm has a slow convergence speed when the state variables approach the sliding surface, the state error cannot be reduced to a smaller area of the sliding surface, and the difficulty in selecting the sliding mode parameters, the sliding mode observer is designed based on the improved STA algorithm to improve the rate of convergence of the state error, and reduce sliding mode chattering while ensuring stability. An adaptive second-order generalized integrator (SOGI) is used to replace the low-pass filter to reduce the estimated angle error caused by the introduction of the low-pass filter. Finally, the normalized filtering phase locked loop is used to estimate the rotor speed and position, which solves the DC offset error of the rotor position in the traditional quadrature phase locked loop during the motor acceleration process, and improves the dynamic performance of the system. The simulation results show that this method can reduce chattering while improving the dynamic performance of the system.