For the estimated rotor position and speed were inaccurate in sensorless interior permanent magnet synchronous motor(IPMSM) control system, a nonlinear observer method with load torque estimation was proposed. Mathematical model for IPMSM was built based on synthetic back EMF, and the nonlinear observer was designed in stator-fixed coordinate frame. Then, a state-adjust strategy had been supplemented to force the nonlinear observer to converge to the expected equilibrium point. Based on the disturbance theo...
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