Adaptive filter based position and speed estimation for high-speed PMSM control

An adaptive filtering strategy is proposed to address the impact of high-frequency chattering, filtering delay and harmonic interference on the estimation accuracy of the conventional sliding mode observer based rotor angular frequency estimation strategy for permanent magnet synchronous motors. At the same time, to solve the problem of narrow passband of the adaptive filter, a frequency-locked loop is introduced to reduce the frequency tracking error, and a quadrature phase-locked loop is introduced to superimpose the fundamental frequency speed on the angular frequency estimation to improve its tracking performance. Finally, the strategy is verified through experiments that the strategy has better dynamic and steady-state performance.