Partitioned-Stator Flux-Switching Permanent-Magnet Motor with Fault Tolerance and Radial-Force Generation Capability

: Madanzadeh, Sadjad; Gruber, Wolfgang; Pröll, Andreas Josef; Jastrzebski, Rafal P.; Lindh, Tuomo; Nevaranta, Niko

: Sopanen, Jussi; Kurvinen, Emil; Viitala, Raine; Holopainen, Timo; Choudhury, Tuhin

: International Conference on Rotordynamics

Publisher: Springer Science and Business Media B.V.

: 2026

Mechanisms and Machine Science

: Proceedings of the 12th IFToMM International Conference on Rotordynamics : Volume 2

: 211

: 188

: 200

: 978-3-032-29036-6

: 978-3-032-29037-3

: 2211-0984

: 2211-0992

DOI: https://doi.org/10.1007/978-3-032-29037-3_16

: https://doi.org/10.1007/978-3-032-29037-3_16

Compared with conventional flux-switching permanent-magnet (FSPM) motors, partitioned-stator (double-stator) FSPM motors offer higher torque density and reduced core saturation. By splitting the stator into inner and outer sections, a larger cross-sectional area is available because windings and permanent magnets are distributed across two stators rather than concentrated in one. This lowers peak flux density in teeth and yokes, mitigates saturation, and enables approximately twofold torque density relative to a conventional FSPM of equal size. However, placing the rotor between the inner and outer stators introduces structural challenges related to rotor dynamics, vibration, and deformation. The need to improve rotor dynamics and to ensure high reliability and continuous torque under fault conditions affecting the motor phases and magnets motivates this work. This paper introduces a novel multi-sector double-stator FSPM motor featuring a unique three-set, two-phase winding scheme (six-phase winding) that enables radial force generation and fault tolerance, thereby maintaining safe torque production. Coordinated current sharing synthesizes controllable radial-force vectors for active vibration damping in mechanically bearing-supported implementations, and for magnetic suspension in bearingless implementations. Finite element analysis of the motor validates the proposed concept.

bearingless motor, Fault-tolerant, Flux-Switching Motor, Multi-Sector, Vibration Suppression