Affiliations: Department of Electrical Engineering, Kunsan National University, Gunsan, Korea
Correspondence:
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Corresponding author: Byungtaek Kim, Department of Electrical Engineering, Kunsan National University, Gunsan, Jeollabuk-do 573-701, Korea. E-mail:btkim@kunsan.ac.kr
Abstract: In this paper, the air gap flux density distribution of a
surface PM vernier motor are analytically investigated, and principles of
torque production are explained by not using lumped electrical circuit
parameters but using magnetic quantities. To these ends, the equations of
magnetic field waves, stored energy and torque are derived. The obtained
equations are compared to those of a conventional PM machine, which shows
that the vernier motor has substantially different characteristics of energy
and peak flux densities in the core parts as well as air gap. Finally the
design guides for vernier motor design to avoid saturation of core material
are presented and verified through FE analysis for a practical model.
Keywords: Air gap flux density, field energy, saturation, vernier motor
