Open-Circuit Fault Control Techniques for Bearingless Multisector Permanent Magnet Synchronous Machines

Zhuang Wen, Giorgio Valente, Andrea Formentini, Luca Papini, Chris Gerada, Pericle Zanchetta

Research output: Journal PublicationArticlepeer-review

3 Citations (Scopus)


This article presents three-phase and single-phase open-circuit fault-tolerant control strategies of radial suspension force and torque generation for bearingless multisector surface mounted permanent magnet synchronous machines. A combined winding topology is installed in the stator so that each phase contributes to both suspension force and motoring torque production. Indeed, a triple sectored three-phase winding is employed. Each three-phase winding is supplied by a power converter to independently control the suspension force vector and torque over each sector. An analytical formulation of the force and torque generation is described considering both three-phase open-circuit and single-phase open-circuit fault conditions. The analytical models of the machine are presented in a generalized matrix form so that they can be applied to any machine with a multisector winding structure. The analytical models are then used to derive the control algorithms that allow us to control the bearingless machine when a whole three-phase winding or one phase of one or two sectors are open circuited. The theoretical analysis is verified with both finite elements analysis and experiment tests. This system shows a good open-circuit fault-tolerant capability.

Original languageEnglish
Article number9357994
Pages (from-to)2527-2536
Number of pages10
JournalIEEE Transactions on Industry Applications
Issue number3
Publication statusPublished - 1 May 2021


  • Bearingless machines
  • multiphase machines
  • permanent magnet synchronous machines
  • single-phase open-circuit fault
  • three-phase open-circuit fault

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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