Affiliations: School of Electrical and Information Engineering, Jiangsu University, Zhenjiang, Jiangsu, China
Correspondence:
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Corresponding author: Wenxiang Zhao, School of Electrical and Information Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, Jiangsu, China. E-mail:zwx@ujs.edu.cn
Abstract: Vernier double-stator permanent-magnet (DS-PM) motor
incorporates the merits of high torque capability and high power factor. In
order to evaluate this new topology, this paper compares two DS-PM motors,
namely a conventional 42-slot concentrated winding one and a recently
proposed 24-slot vernier one. For a fair comparison, both DS-PM motors are
designed based on the same size. The slot-vector star graph is applied to
analyze their different winding constructions. By analyzing harmonic
spectrums of the flux density in the air-gap, their different operation
principles are comparatively investigated. Their electromagnetic
performances are predicted by using finite-element method. The results show
that the vernier one can provide higher torque capability and flux-weakening
capability, but suffers from higher loss even though it has lower pole and
slot number than the conventional one. Hence, vernier DS-PM motors are more
suitable for the applications such as high torque density, good cooling
condition and wide speed range.
