Abstract
Halbach motors have attracted lots of attention in novel ship propelling and ocean current generators as they have much dominance. Under the condition of ideal ferromagnetic material and slotless stators, randomly magnetized Halbach array is considered as an equivalence of two 90° Halbach (180° Halbach) arrays, and a new analytic method is proposed in this paper to analyze the randomly magnetized Halbach motors. Fourier series of magnetic scalar potential is calculated, and the expression of air-gap flux density of a 90° Halbach motor is given in polar coordinate system. On the basis of calculations above, the magnetization intensity expression of a randomly magnetized Halbach motor in a pole, and the air-gap flux density distribution of randomly magnetized Halbach motor are obtained; and the relationship of air-gap flux density between the numbers of poles, permanent magnet thickness as well as magnetizing angle are analyzed. The finite element method and experimental results verify the effectiveness of the methods above.
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