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Torque-ripple minimization in modular permanent-magnet brushless machines

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3 Author(s)
Atallah, K. ; Dept. of Electron. & Electr. Eng., Univ. of Sheffield, UK ; Jiabin Wang ; Howe, D.

This paper discusses the suitability of four-phase, five-phase, and six-phase modular machines, for use in applications where servo characteristics and fault tolerance are key requirements. It is shown that an optimum slot number and pole number combination exists, for which excellent servo characteristics could be achieved, under healthy operating conditions, with minimum effects on the power density of the machine. To eliminate torque ripple due to residual cogging and various fault conditions, the paper describes a novel optimal torque control strategy for the modular permanent-magnet machines operating in both constant torque and constant power modes. The proposed control strategy enables ripple-free torque operation to be achieved, while minimizing the copper loss under voltage and current constraints. The utility of the proposed strategy is demonstrated by computer simulations on a four-phase fault-tolerant drive system.

Published in:

Industry Applications, IEEE Transactions on  (Volume:39 ,  Issue: 6 )

Date of Publication:

Nov.-Dec. 2003

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