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ABSTRACT
The air gap field distribution in permanent magnet electric machines differs from that in wound field ones. In order to analyse the influence of magnet and air gap geometry on the shape of the air gap field in PM machines, an analytical method, which is much more economic and efficient than the numerical ones, is proposed in this paper. By using the method of Fourier expansion, a great set of curves for the air gap field characteristic coefficients in PM machines can be obtained. These design curves are necessary in simplified performance calculations for both AC and DC PM machines.