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An accurate wide-speed range control method of IPMSM considering resistive voltage drop and magnetic saturation

Wang, Shuo; Kang, Jinsong; Degano, Michele; Galassini, Alessandro; Gerada, Chris

An accurate wide-speed range control method of IPMSM considering resistive voltage drop and magnetic saturation Thumbnail


Shuo Wang

Jinsong Kang

Professor of Advanced Electrical Machines

Alessandro Galassini


Shuo Wang
Research Group

Jinsong Kang
Research Group

Alessandro Galassini
Research Group


This paper deals with the high accurate current set-points solution for Interior Permanent-Magnet Synchronous Motors (IPMSM) in wide-speed range applications. Considering voltage and current constraints, the operating regions can be divided into Maximum Torque Per Ampere (MTPA), Maximum Current (MC), Field Weakening (FW) and Maximum Torque Per Voltage (MTPV) regions, which requires to solve different non-linear functions in real time to obtain optimal current set-points. Traditional methods including curve-fitting methods and polynomial approximation (PA) methods are not easy to obtain these solutions, especially involving magnetic saturation problems. In this paper, Newton-Raphson (N-R) algorithm for improving the control accuracy of the current set-points is proposed. Meanwhile, parameters influence including magnetic saturation and resistive voltage drop is fully investigated. Compared with PA method, the proposed method is able to converge to accurate solutions in few numbers of iterations with reduced execution time, which can be easily implemented on an off-the-shelf Digital Signal Processor (DSP). Both simulation results and experimental results on an 8kW IPMSM rig are conducted showing good agreement with the expected results. Index Terms-Cross Saturation, flux-weakening control, interior permanent-magnet synchronous motors (IPMSM), magnetic Saturation, Newton-Raphson (N-R) method, resistive voltage drop.


Gerada, C., Galassini, A., Degano, M., Kang, J., & Wang, S. (2020). An accurate wide-speed range control method of IPMSM considering resistive voltage drop and magnetic saturation. IEEE Transactions on Industrial Electronics, 67(4), 2630-2641 .

Journal Article Type Article
Acceptance Date Mar 26, 2019
Online Publication Date Apr 29, 2019
Publication Date Apr 1, 2020
Deposit Date Apr 17, 2019
Publicly Available Date Apr 18, 2019
Journal IEEE Transactions on Industrial Electronics
Print ISSN 0278-0046
Electronic ISSN 1557-9948
Publisher Institute of Electrical and Electronics Engineers
Peer Reviewed Peer Reviewed
Volume 67
Issue 4
Pages 2630-2641
Keywords Cross Saturation, Flux-weakening control, Interior permanent-magnet synchronous motors (IPMSM), Magnetic Saturation, Newton-Raphson (N-R) method, Resistive voltage drop
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