1. College of Electrical and Information Engineering Hunan University Changsha 410082 China 2. Electric Drive Control and Intelligent Equipment Hunan Key Laboratory Hunan University of Technology Zhuzhou 412007 China
Abstract：Aiming at the problem of direct current offset error and harmonic pulsation of rotor position estimation obtained by rotor position observer based on traditional sliding mode observation in the sensorless control system of interior permanent magnet synchronous motor, an improved rotor position observer based on proportional resonant filtering is proposed in this paper to suppress the rotor position observation error and improve the position accuracy of sensorless control system. By introducing the proportional resonant filter, this method can extract the fundamental component in the estimated back electromotive force (back-EMF), filter out the harmonic components and suppress the rotor position harmonic pulsation. Meanwhile, because the improved observer does not require an additional low-pass filter (LPF), the phase delay in the estimated back-EMF is eliminated, and the DC offset error in the estimated rotor position is reduced. Finally, the effectiveness of the proposed observer is verified by a 1.5kW interior permanent magnet synchronous motor drive control experimental platform.
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2020, Vol. 35 
