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Title: Sixth-harmonic back-EMF based sensorless control for switched-flux permanent magnet machine
Authors: Lin, Tzu-Chi
Liu, J.M.
Zhu, Zi-Qiang
Keywords: Harmonic back-EMF
High-resolution rotor position estimator
Permanent magnet machine
SFPM machine
Sensorless control
Switched flux
Issue Date: 2016
Publisher: © IEEE
Citation: LIN, T.-C., LIU, J.M. and ZHU, Z.Q., 2016. Sixth-harmonic back-EMF based sensorless control for switched-flux permanent magnet machine. 13th IEEE Vehicle Power and Propulsion Conference (VPPC), Hangzhou, China, 17th-20th October 2016.
Abstract: In switched-flux permanent magnet (SFPM) machines, the 6th-harmonic back electromotive force (EMF) is dominant, whilst the 3rd-harmonic back-EMF is much smaller. This paper proposes several new position estimation methods for sensorless control based on the 6th-harmonic back-EMF. Firstly, by detecting the zero-crossings of the 6th-harmonic back-EMF with/without eliminating the influence of the 3rd-harmonic back EMF, the related rotor positions can be determined precisely at these zero-crossings. However, since the intermediate rotor positions need to be determined by linear interpretation between two zero-crossings, it only exhibits excellent performance under steady state. Furthermore, the continuous rotor position can be estimated from the proposed new observer by utilizing the combined signals of 6th-harmonic back-EMF and flux-linkage, together with a synchronous reference frame filter (SRFF) and harmonic elimination. Experimental validation show that (a) by eliminating the 3rd-harmonic back-EMF effect, the accuracy of the proposed 6th-harmonic back-EMF zero-crossings detection method can be improved, (b) SRFF is effective to minimize the influence of non-constant amplitudes of the 6th-harmonic backEMF and flux-linkage, (c) the comparison between the fundamental, the 3rd-harmonic back-EMF and the proposed method are presented in order to highlight the effectiveness of proposed control strategy under different operating conditions.
Description: This paper is closed access. © 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
Version: Published
DOI: 10.1109/VPPC.2016.7791776
URI: https://dspace.lboro.ac.uk/2134/24443
Publisher Link: http://dx.doi.org/10.1109/VPPC.2016.7791776
ISBN: 9781509035281
Appears in Collections:Closed Access (Mechanical, Electrical and Manufacturing Engineering)

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