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Space vectors and pseudo inverse matrix methods for the radial force control in bearingless multi-sector permanent magnet machines

Sala, Giacomo; Valente, Giorgio; Formentini, Andrea; Papini, Luca; Gerada, David; Zanchetta, Pericle; Tani, A.; Gerada, C.

Authors

Giacomo Sala

Giorgio Valente

Andrea Formentini ezzaf1@exmail.nottingham.ac.uk

Luca Papini eexlp4@exmail.nottingham.ac.uk

David Gerada ezzdg2@exmail.nottingham.ac.uk

Pericle Zanchetta pericle.zanchetta@nottingham.ac.uk

A. Tani

C. Gerada chris.gerada@nottingham.ac.uk



Abstract

Two different approaches to characterize the torque and radial force production in a Bearingless Multi-Sector Permanent Magnet (BMSPM) machine are presented in this work. The first method consists of modelling the motor in terms of torque and force production as a function of the stationary reference frame α-β currents. The current control reference signals are then evaluated adopting the Joule losses minimization as constrain by means of the pseudo inverse matrix. The second method is based on the control of the magnetic field harmonics in the airgap through the current Space Vector (SV) technique. Once the magnetic field harmonics involved in the torque and force production are determined, the SV transformation can be defined to obtain the reference current space vectors. The methods are validated by numerical simulations, Finite Element Analysis (FEA) and experimental tests. The differences in terms of two Degrees of Freedom (DOF) levitation performance and efficiency are highlighted in order to give the reader an in-depth comparison of the two methods.

Journal Article Type Article
Publication Date Sep 1, 2018
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 65
Issue 9
APA6 Citation Sala, G., Valente, G., Formentini, A., Papini, L., Gerada, D., Zanchetta, P., …Gerada, C. (2018). Space vectors and pseudo inverse matrix methods for the radial force control in bearingless multi-sector permanent magnet machines. IEEE Transactions on Industrial Electronics, 65(9), doi:10.1109/TIE.2018.2795590
DOI https://doi.org/10.1109/TIE.2018.2795590
Keywords Analytical models, Displacement control, Force control, Machine vector control, Magnetic levitation, Permanent Magnet machines
Publisher URL http://ieeexplore.ieee.org/document/8264739/
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information © 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, 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 component of this work in other works.

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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