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Radial force control of multi-sector permanent magnet machines for vibration suppression

Valente, G.; Papini, Luca; Formentini, Andrea; Gerada, C.; Zanchetta, Pericle


G. Valente

Luca Papini

Andrea Formentini


Radial force control in electrical machines has been widely investigated for a variety of bearingless machines, as well as for the conventional structures featuring mechanical bearings. This paper takes advantage of the spatial distribution of the winding sets within the stator structure in a multisector permanent-magnet (MSPM) machine toward achieving a controllable radial force. An alternative force control technique for MSPM machines is presented. The mathematical model of the machine and the theoretical investigation of the force production principle are provided. A novel force control methodology based on the minimization of the copper losses is described and adopted to calculate the d–q axis current references. The predicted performances of the considered machine are benchmarked against finite-element analysis. The experimental validation of the proposed control strategy is presented, focusing on the suppression of selected vibration frequencies for different rotational speeds.


Valente, G., Papini, L., Formentini, A., Gerada, C., & Zanchetta, P. (2018). Radial force control of multi-sector permanent magnet machines for vibration suppression. IEEE Transactions on Industrial Electronics, 65(7),

Journal Article Type Article
Acceptance Date Oct 29, 2017
Online Publication Date Dec 4, 2017
Publication Date Jul 1, 2018
Deposit Date Mar 8, 2018
Publicly Available Date Mar 8, 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 7
Keywords Force Control, Electromagnetic forces, Permanent
magnet machines, Brushless motors, Multiphase motors,
Optimization methods, Vibration control, Vibration measurement.
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