| Citation: | ZHAO Yahui, FENG Ming, LI Weiwenet al. Improved rotor position detection method based on SMO[J]. Journal of Beijing University of Aeronautics and Astronautics, 2020, 46(12): 2329-2338. doi: 10.13700/j.bh.1001-5965.2019.0637(in Chinese)
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Due to the problem that the rotor position of sensorless Permanent Magnet Synchronous Motor (PMSM) cannot be accurately observed at high speed, which causes distortion of three-phase current fluctuation, an improved Sliding Mode Observer (SMO) is proposed to estimate the rotor position and speed more precisely. A function is adopted to be the switching function of the SMO to eliminate the fluctuation in the calculation of the back-EMF. Furthermore, a Software Phase Locked Loop (SPLL) algorithm is introduced to decrease the influence of chatting of traditional sliding mode observer on rotor position. The combined method significantly improves the observation accuracy of the rotor position angle at high speed. A controller of high speed PMSM is successfully developed and can works steadily under ultra-high speed and high power condition.
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