Abstract
Accurate analytical model is critical for the design and optimization of the electromagnetic devices. In this paper, a fully 3D analytical model for eddy-current couplers with a Quasi-Halbach magnet array is presented. The originality of this paper lies in the Halbach magnet array with arbitrary magnetization direction and the eddy currents generated in conductor rotor are considered in the 3D analytical computation. To avoid the complex computation with Bessel function, the 3D cylindrical geometry is linearized and discussed in 3D Cartesian coordinates. The magnetic scalar potential in the non-conductor region (PM, air-gap, and back iron) and magnetic field strength in eddy-current region (conductor disk and its back iron) are calculated based on the separation variable method. The electromagnetic field, axial force and torque are obtained. In the end, by using the 3D finite element analysis, the feasibility and validity of the general 3D analytical model are verified.
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