サマリウムコバルト磁石を用いた埋込磁石同期モータの高温動作特性

抄録

This study describes characteristics of an interior permanent magnet synchronous motor (IPMSM) using samarium cobalt (SmCo) magnets, operated at high ambient temperature up to 200℃. Although the SmCo magnet is not as strong as neodymium iron boron (NdFeB) magnets, it has less thermal demagnetization, and hence can operate at a wider temperature range and have better thermal stability than the NdFeB magnet. Two IPMSM prototypes using SmCo (LM-34SH) and NdFeB (N40-UH) magnets were built and tested at ambient temperatures up to 200℃. The test results demonstrated that the prototype IPMSM with SmCo magnets produced higher torque at more than 100℃ and had a wider high-efficiency range at 200℃ than that with NdFeB magnets, and hence it was experimentally verified that the IPMSM with SmCo has thermal motor performance superiority.