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Unified theory of torque production in switched reluctance and synchronous reluctance motors

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3 Author(s)
Staton, D.A. ; Dept. of Electr. Eng., Glasgow Univ., UK ; Soong, W.L. ; Miller, T.J.E.

A method is described for calculating the average and instantaneous torque of the synchronous reluctance motor from a knowledge of the trajectory of the phase flux-linkage versus phase current [i-ψ] waveform, i.e., the same method as used with the switched reluctance motor. This allows a direct comparison between torque production in the two motors to be made. Analytical and finite-element analysis both show that the [i-ψ] loci of the synchronous reluctance motor are ellipsoidal in shape and are not limited to the first and third quadrants as in the switched reluctance motor. The [i-ψ] loci of the synchronous reluctance motor are not bounded by the magnetization curves in the same sense as in the switched reluctance motor and rely upon mutual coupling between phases for correct operation

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Industry Applications, IEEE Transactions on  (Volume:31 ,  Issue: 2 )