The design of high speed permanent magnet motors involves taking into account conflicting requirements from the point of view of electromagnetic and mechanical design. The authors focus on a particular technique to achieve high torque to magnet volume ratio while providing an adequate mechanical strength for the rotor. For this purpose the use of a can, which may consist of magnetic or nonmagnetic material, to contain the rotor is proposed. The authors present the results of computational and experimental investigations on the use of a solid steel can and its effect on the performance of motors having high energy magnets. Accurate modelling of a particular design, obtained using the 2-D finite element software package MOTOR-CAD, is also given. The results obtained by computation show good agreement with those obtained experimentally.
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