The suitability of multistacked imbricated permanent-magnet rotors for use with a range of magnet materials is discussed and the optimal balance between parameters is assessed using a discrete-reluctance method and a 3-dimensional finite-element field analysis program. The effects of different permanent-magnet materials including the recently developed neodymium-iron compounds on the design of the imbricated rotor are described. It is shown that this configuration of rotor is suitable for high-torque applications making use of recently developed materials for excitation and a design is presented.
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Low et al. (1986) studied this question.