Abstract
This study deals with the core design of a PM vernier machine considering modulation flux effects, and the comparative investigation on volume and performance characteristics of the vernier over conventional PM machines are addressed. To these ends, for a PM vernier machine in operation at the base-speed, the flux density equations for teeth and yokes considering the flux modulation effects are derived, where the air gap harmonic permeance function is used. Using the derived equations, a PM vernier motor with specified yoke flux densities is designed. To identify the predicted flux yoke densities, the flux distribution and iron losses in core parts are analyzed through time-step finite element (FE) simulations. Through Fourier series expansion of the air gap flux waves obtained by FE analysis at several specified times, the harmonic components constituting the flux waves are investigated and their speeds are also evaluated in numerical ways. Finally, to estimate the competitiveness of vernier machines versus conventional machines, the designed PM vernier motor is compared against two different conventional PM motors designed through the same design procedures in various aspects such as volume, torque capacity, efficiency, and power factor, in which, in particular, the core losses are included in efficiency calculation.
Highlights
Through development for more than 40 years, the characteristic performances of brushless PM motors are approaching their limits [1,2,3,4,5,6], and there are strong needs for new motors with higher power densities
First, the air gap flux distribution is presented in the form of are investigated and the competitiveness of the vernier over conventional PM machines are evaluated analytical expressions in consideration of all working fluxes in the vernier motor which consist of the in fair conditions
Figures and show the flux lines and air gap flux density of the vernier motor when the rotor is located at the different positions of θ and density of the vernier motor when the rotor is located at the different positions of θm =m0° and 9°, density of the vernier motor when the rotor is located at the different positions of θm = 0° and 9°, 9◦, respectively
Summary
Through development for more than 40 years, the characteristic performances of brushless PM motors are approaching their limits [1,2,3,4,5,6], and there are strong needs for new motors with higher power densities. To compare a vernier and a conventional PM machine fairly, both machines presence of the modulation flux of a vernier machine provides additional considerations in the iron should be designed with same flux density level in air gap as well as iron cores. In this study, the modulation flux effects on the core design of a PM vernier machine in fair conditions To these ends, first, the air gap flux distribution is presented in the form of are investigated and the competitiveness of the vernier over conventional PM machines are evaluated analytical expressions in consideration of all working fluxes in the vernier motor which consist of the in fair conditions. Model are compared, and the competitiveness of the vernier machine is evaluated
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