A Sensorless Control Algorithm Based on Limit Cycle Oscillator for Permanent Magnet Synchronous Motor Drives with Nonlinear Flux Observation

Focusing on the low-speed operation control strategy of a permanent magnet synchronous motor based on the model method, this paper investigates a position sensor-free algorithm for a permanent magnet synchronous motor based on a nonlinear magnetic chain observer, gives a limit-loop oscillator Fixed-frequency (FLCO), and combines the FLCO-FLL algorithm to give the corresponding control rate and transfer function, and builds a model for simulation on the platforms of MATLAB/SIMULINK platform to build a model for simulation, and the proposed algorithm is analyzed and the suppression of interference by the algorithm is verified.