科研之友
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摘要
Due to some limitations of permanent-magnet (PM) production and magnetizing technology, it is difficult to construct the large magnetic poles of high-power surface-mounted PM machines by using integral magnets. One simple solving scheme is that the large magnetic poles can be formed by several parallelly magnetized magnet segments. For the surface-mounted PM machines with parallelly magnetized magnet segments, this paper gives an accurate analytical solution of the magnetic field. First, in 2-D polar coordinates, the PM machine model is divided into three subdomains, and the magnetic field governing equations are established in each region. By adopting the theory of Fourier's series and the method of separating variables, the solutions of the magnetic field are determined according to associated boundary conditions. Then, the proposed analytical model is compared with finite element method, and the results show that they have a good agreement. Based on the obtained magnetic field solution, the induced electromotive force of a designed PM machine is calculated, and the result is verified by experiment.
