It is important to accurately estimate speed and rotor position for the sensorless control strategy of interior permanent magnet synchronous motor in pulsating high-frequency voltage injection method.In order to solve the problem of inaccurate current signal detection,a current detection error compensation method is proposed in this paper.The method adds a parameter-adaptive notch filter section on the basis of the traditional position observer.Through real-time parameter revisions,it eliminates the second harmonic caused by current detection errors in the position observer,thereby enhancing the accuracy of speed and rotor position estimation.Additionally,a second-order generalized integrator with higher quality factor is employed to extract high-frequency response current,thereby improving the dynamic performance of the control system.Finally,an experimental platform is constructed to validate the feasibility of the proposed compensation method.
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