Analytical Modelling of Magnetic Field Distribution in Spoke Type Permanent Magnet Machines

An exact 2D analytical method for magnetic field and electromagnetic torque calculation in high speed spoke type interior permanent magnet Machines considering slotting effects, magnetization orientation and winding layout has been proposed in this paper. The analytical method is based on the resolution of Laplace and Poisson equations as well as Maxwell equation in polar coordinate by using sub-domain method and applying hyperbolic functions. The proposed method is applied on the performance computation of a prototype spoke type permanent magnet machine, i.e., a 3-phase 18S-8P motor. The analytical results are validated through FEA method and experimental tests.