Electromagnetic performance analysis and optimal design of modular machine with halbach permanent-magnet array

A modular permanent magnet (MPM) machine is a remerging fault tolerant machine, offering the advantages of fault tolerance, high power density and high efficiency. In this paper, the analytical design of a MPM motor with halbach PM array is investigated and a general design procedure is presented. Moreover, finite element method (FEM) is adopted to compare the electromagnetic performance of the designed machine with that of the conventional one, including flux density, PM fluxes and back-EMF. Furthermore, a co-simulation model of the MPM motor drive is developed to predict the system perform, in which magnetic circuit and the electric circuit are coupled in time-domain. Finally, the designed four-phase MPM motor is prototyped and test. The experimental results are given to verify the theoretical analysis.