Abstract

Heavy rare-earth materials, such as dysprosium (Dy), have problems associated with their high cost and unstable supply. This paper proposes a permanent magnet (PM) assisted synchronous reluctance motor (PMASynRM) with Dy-free bonded magnets and compares its performance considering irreversible demagnetization with the conventional interior PM synchronous motor (IPMSM) with sintered rare-earth magnets under various temperature conditions on the basis of the results of the two-dimensional finite element analysis. It was found that the performance of the proposed PMASynRM was comparable to, or better than, that of the conventional IPMSM below 100°C. However, it was also found that the performance degradation due to the temperature rise in the proposed PMASynRM was marked owing to irreversible demagnetization of the bonded magnets.

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