TY - JOUR
T1 - A Fast Estimation of Initial Rotor Position for Low-Speed Free-Running IPMSM
AU - Wu, Ting
AU - Luo, Derong
AU - Huang, Sheng
AU - Wu, Xuan
AU - Liu, Kan
AU - Lu, Kaiyuan
AU - Peng, Xiaoyan
N1 - Funding Information:
Manuscript received July 17, 2019; revised October 29, 2019; accepted November 27, 2019. Date of publication December 4, 2019; date of current version March 13, 2020. This work was supported in part by the National Key Research and Development Program of China under Grant 2018YFF0212903 and in part by the National Natural Science Foundation of China under Grants 51707062, 51575167, and 51877075. Recommended for publication by Associate Editor T. Shi. (Corresponding author: Derong Luo.) T. Wu, D. Luo, and X. Wu are with the College of Electrical and Information Engineering, Hunan University, Changsha 410006, China (e-mail: wting_tata@hnu.edu.cn; hdldr@sina.com; wuxuan24@163.com).
Publisher Copyright:
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Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/7
Y1 - 2020/7
N2 - Fast and reliable initial rotor position detection is essential for restarting sensorless permanent magnet synchronous motors (PMSMs) in free-running condition. In this article, a fast initial rotor position estimation method for low-speed free-running motor is proposed, which utilizes a combined sinusoidal current and square-wave voltage injection method. The sinusoidal current is imposed into the estimated d-axis to magnify the magnetic saturation effect. The amplitudes of the d-axis current caused by injected square-wave voltage are then accumulated. The large difference of the two integrated signals for positive and negative d-axis currents can be reliably used to identify the rotor polarity. Meanwhile, in low-speed free-running stage, the change of saturation degrees introduced by the injected sinusoidal signal does not affect the position estimation accuracy. Moreover, even if the sinusoidal current signal is injected in the incorrect d-axis, the resultant torque is small and unexpected rotation of the rotor is prevented. Its influence on the free-running motor is negligible, due to the combined injection with continuously online updated estimated rotor position by high-frequency square-wave voltage injection during the polarity identification process. Finally, the effectiveness of the proposed method is investigated on a 1.5 kW interior PMSM test platform.
AB - Fast and reliable initial rotor position detection is essential for restarting sensorless permanent magnet synchronous motors (PMSMs) in free-running condition. In this article, a fast initial rotor position estimation method for low-speed free-running motor is proposed, which utilizes a combined sinusoidal current and square-wave voltage injection method. The sinusoidal current is imposed into the estimated d-axis to magnify the magnetic saturation effect. The amplitudes of the d-axis current caused by injected square-wave voltage are then accumulated. The large difference of the two integrated signals for positive and negative d-axis currents can be reliably used to identify the rotor polarity. Meanwhile, in low-speed free-running stage, the change of saturation degrees introduced by the injected sinusoidal signal does not affect the position estimation accuracy. Moreover, even if the sinusoidal current signal is injected in the incorrect d-axis, the resultant torque is small and unexpected rotation of the rotor is prevented. Its influence on the free-running motor is negligible, due to the combined injection with continuously online updated estimated rotor position by high-frequency square-wave voltage injection during the polarity identification process. Finally, the effectiveness of the proposed method is investigated on a 1.5 kW interior PMSM test platform.
KW - High-frequency (HF) square-wave voltage injection
KW - initial rotor position estimation
KW - magnetic polarity detection
KW - permanent magnet synchronous motors (PMSMs)
KW - sensorless
UR - http://www.scopus.com/inward/record.url?scp=85082167856&partnerID=8YFLogxK
U2 - 10.1109/TPEL.2019.2958101
DO - 10.1109/TPEL.2019.2958101
M3 - Journal article
AN - SCOPUS:85082167856
SN - 0885-8993
VL - 35
SP - 7664
EP - 7673
JO - IEEE Transactions on Power Electronics
JF - IEEE Transactions on Power Electronics
IS - 7
M1 - 8928948
ER -