期刊
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
卷 69, 期 11, 页码 10846-10858出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2021.3125667
关键词
Observers; Stators; Mathematical models; Band-pass filters; Estimation; Adaptive filters; Voltage; Backstepping observer; dc error suppression; permanent magnet synchronous motor (PMSM); sensorless drives; two-degree-of-freedom structure
资金
- National Natural Science Foundation of China [51761135112, 52177031]
A two-degree-of-freedom structure-based backstepping observer (TSBO) is proposed in this article to improve the accuracy and frequency-domain response of the BEMF observer for sensorless PMSM drives. By introducing a second-order complex vector transfer function, the TSBO achieves bandpass characteristics without the need for an extra filter.
The back-electromotive force (BEMF) model-based observer is an attractive sensorless control strategy for permanent magnet synchronous motor (PMSM) drives. However, the accuracy of BEMF observer is deteriorated due to the dc offsets caused by current measurement and inverter nonlinearity. To address this problem, the article proposed a two-degree-of-freedom structure-based backstepping observer (TSBO) for sensorless PMSM drives. First, a two-degree-of-freedom structure is presented to improve the frequency-domain response of the BEMF observer. Second, a second-order complex vector transfer function is inversely introduced into the studied structure to achieve bandpass characteristics. Compared with the conventional BEMF observer, the studied TSBO can achieve dc error suppression without introducing the extra bandpass filter. The studied algorithm is verified by the experimental results on a 4.4 kW PMSM platform.
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