Design of a Sensorless Control Experimental Platform for Interior Permanent Magnet Synchronous Motor Based on Current Detection Error Compensation
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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