To unravel the issue of low position estimation correctness and unstable switching in each speed domain of the existing PMSM position sensorless control method,a full speed domain composite control scheme is proffered.The rotor position is acquired by pulsating high-frequency voltage injection during operation in the low-speed domain.A position sensorless control method based on FSTSM-MRAS is proffered for medium and high speed operation.This method accelerates the convergence of the error by adding a feedback correction link,uses FSTSM algorithm to replace the PI link,and introduces the hyperbolic tangent function instead of the symbol function in FSTSM algorithm.The simulation results verify the feasibility and effectiveness of the proposed control strategy.
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