Skip to main content

Research Repository

Advanced Search

Performance Improvement of Bearingless Multisector PMSM With Optimal Robust Position Control

Valente, Giorgio; Formentini, Andrea; Papini, Luca; Gerada, Christopher; Zanchetta, Pericle


Giorgio Valente

Andrea Formentini

Luca Papini


© 2018 IEEE. Bearingless machines are relatively new devices that consent to suspend and spin the rotor at the same time. They commonly rely on two independent sets of three-phase windings to achieve a decoupled torque and suspension force control. Instead, the winding structure of the proposed multisector permanent magnet (MSPM) bearingless machine permits to combine the force and torque generation in the same three-phase winding. In this paper, the theoretical principles for the torque and suspension force generation are described and a reference current calculation strategy is provided. Then, a robust optimal position controller is synthesized. A multiple resonant controller is then integrated in the control scheme in order to suppress the position oscillations due to different periodic force disturbances and enhance the levitation performance. The linear quadratic regulator combined with the linear matrix inequality theory has been used to obtain the optimal controller gains that guarantee a good system robustness. Simulation and experimental results will be presented to validate the proposed position controller with a prototype bearingless MSPM machine.


Valente, G., Formentini, A., Papini, L., Zanchetta, P., & Gerada, C. (2019). Performance Improvement of Bearingless Multisector PMSM With Optimal Robust Position Control. IEEE Transactions on Power Electronics, 34(4), 3575-3585.

Journal Article Type Article
Acceptance Date Jun 29, 2018
Online Publication Date Jul 4, 2018
Publication Date Apr 1, 2019
Deposit Date Aug 21, 2018
Publicly Available Date Aug 21, 2018
Journal IEEE Transactions on Power Electronics
Print ISSN 0885-8993
Electronic ISSN 1941-0107
Publisher Institute of Electrical and Electronics Engineers
Peer Reviewed Peer Reviewed
Volume 34
Issue 4
Pages 3575-3585
Keywords Bearingless machines, Multi-phase machines, LQR, LMI, H2 control, H1 control
Public URL
Publisher URL
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.


You might also like

Downloadable Citations