Abstract
In the 6/4 variable flux reluctance machine (VFRM), due to the non-sinusoidal flux-linkage, it is not accurate to predict the torque/speed characteristics of 6/4 VFRM by only considering the fundamental component of flux-linkage. This is mainly because the high order harmonics of flux-linkage in 6/4 VFRM contribute to the increase of the amplitude of phase voltage, which reduces the dc-link voltage utilization. In this paper, the high order harmonics in the flux-linkage are investigated firstly, and the influence of high order harmonics of flux-linkage on the torque/speed characteristic in 6/4 VFRM is presented. From the investigations, it shows that the second order harmonic of the flux-linkage can significantly reduce the dc-linkage voltage utilization, which results in the deteriorated torque/speed characteristics in 6/4 VFRM. The test results of a prototype 6/4 VFRM is presented for verification.
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