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Fault-tolerant permanent magnet machine drives

Fault-tolerant permanent magnet machine drives

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The paper examines the use of permanent magnet machine drives in high performance, safety-critical applications. Likely fault modes are identified and machine designs are developed for fault-tolerant operation, without severely compromising the drive performance. Fault tolerance is achieved by adopting a modular approach to the drive, with each phase electrically, magnetically, thermally and physically independent of all others. Power converter requirements are discussed and methods for controlling a faulted phase developed to minimise the impact of a machine or power converter fault.

Inspec keywords: AC motor drives; power convertors; reliability; permanent magnet motors; safety

Other keywords: modular approach; fault-tolerant operation; faulted phase control; power converter requirements; safety-critical applications; 6-phase motor; fault-tolerant permanent magnet machine drives; fault modes

Subjects: Plant engineering, maintenance and safety; a.c. machines; Maintenance and reliability; Power convertors and power supplies to apparatus; Reliability; Drives; Health and safety aspects

References

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      • Richter, E.: `Switched reluctance machines for high performance operations in aharsh environment – a review paper', Proceedings of the ICEM 1990, Boston, MA.
    2. 2)
      • Jack, A.G., Mecrow, B.C.: `Safety critical drives for aerospaceapplications', Proceedings of the ICEM 1994, 1, Paris, p. 91–96.
    3. 3)
      • Craig, E., Mecrow, B.C., Atkinson, D.J., Jack, A.G.: `A fault detectionprocedure for single phase bridge converters', EPE Conference'93, 1993, 4, Brighton, p. 466–471.
    4. 4)
      • Richter, E.: `High temperature switched reluctance motors and generators forfuture aircraft engine applications', Proceedings of the American control conference, June 1988, Atlanta, p. 1846–1851.
    5. 5)
      • C.M. Stephens . Fault detection and management system for fault-tolerantswitched reluctance motor drives. IEEE Trans. Ind. Appl. , 6 , 1098 - 1102
    6. 6)
      • Mecrow, B.C., Jack, A.G., Haylock, J.A.: `Fault tolerant permanent magnet machine drives', IEE 7th international conference on Electrical machinesanddrives, 1995, Oxford, p. 433–467.
    7. 7)
      • T.M. Jahns . Improved reliability in solid state AC drives by means of multipleindependent phase-drive units. IEEE Trans. , 3 , 321 - 331
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