Sensorless control of PMSMs based on an adaptive ST-SMO and suppressing zero-current clamp phenomenon
2023 IEEE International Conference on Mechatronics and Automation (ICMA)(2023)
摘要
Sliding mode observer (SMO) is popular in the sensorless control of permanent magnet synchronous motors (PMSMs), and as the recent advances, the super-twisting SMO (ST-SMO) reduces chattering and retains a decent robustness, however, inappropriate coefficient choice of a ST-SMO can contribute to chattering particularly at low speed. In this work, an adaptive ST-SMO is proposed, where the coefficient is designed to change with the speed, and thus the ST-SMO can fit a wide speed range in the sensorless mode. In addition, a dead time compensation method is adopted to improve the steady-state sensorless drive performance, and specifically, a phase current polarity judgement method under a fuzzy rule and predicted current is proposed to cope with the zero-current clamp phenomenon. Finally, the proposed method is validated by the experimental results.
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关键词
sensorless control,super-twisting sliding mode observer (ST-SMO),dead time compensation,permanent magnet synchronous motor (PMSM)
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