Abstract

This paper proposes a design technique of permanent magnet synchronous motor (PMSM) using hybrid type permanent magnet (PM) to consider simple structure and irreversible demagnetization. Here, the hybrid type PM is defined as using both of neodymium permanent magnet (Nd-PM) and ferrite permanent magnet (Fe-PM) in a rotor. For developing a competitive motor in terms of performance per manufacturing cost, firstly, the hybrid type PMSM is suggested by designing simple configuration considering magnetic property of Nd-PM and Fe-PM. Secondly, in this study, irreversible demagnetization of Fe-PM occurring by reversed magnetic field of Nd-PM is analyzed, when a rotor exists with and without a stator, and based on this analysis, a technique for avoiding the irreversible demagnetization phenomenon is proposed in order to improve reliability of hybrid type PMSM. Finally, the prototype based on proposed design is developed for evaluating the performance and demagnetization phenomenon through experiment.

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