This paper illustrates a procedure to design a interior permanent magnet motor, suitable for achieving a given flux-weakening characteristic, which is considered as a design requirement. The proposed procedure combines a preliminary analytical evaluation of motor size together with a fine Finite Element Method analysis. This fine evaluation is carried out in order not only to test the motor performance in the whole flux-weakening speed range but also to refine the design. At last, an example of a motor design is reported.
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