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A Novel E-Core Switched-Flux PM Brushless AC Machine

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4 Author(s)
Chen, J.T. ; Dept. of Electron. & Electr. Eng., Univ. of Sheffield, Sheffield, UK ; Zhu, Z.Q. ; Iwasaki, S. ; Deodhar, R.P.

A novel E-core switched-flux permanent-magnet (SFPM) brushless machine is proposed, and its electromagnetic performance is compared with that of the conventional SFPM brushless machine. The operation principle of the E-core SFPM machine will be first described, and the influence of stator and rotor pole number combinations is investigated, while the electromagnetic performance of the optimized E-core SFPM machine is predicted by finite-element analyses and validated by experiment. It is shown that the number and volume of magnets in the E-core SFPM machine is significantly reduced, only half of that in the conventional machine, while the phase back electromotive force and torque of the E-core machine are ~15% larger than those of the conventional machine.

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Industry Applications, IEEE Transactions on  (Volume:47 ,  Issue: 3 )