DOI: 10.1002/eej.23494 ISSN: 0424-7760
Development of High Power‐Density Motors for Electric Axles Using Nd‐Based Bonded Magnets
Kenya Naruse, Choongsik Kim, Masahiro Kayano, Aki Watarai, Hironari Mitarai, Kenji NakamuraABSTRACT
In recent years, a demand for smaller traction motors with higher power has arisen. This study focused on high‐speed rotation for miniaturization and developed a prototype motor using Nd‐based bonded magnets. It had a maximum rotational speed of 34,000 rpm, which is twice that of existing 50 kW‐class motors. The motor achieved the desired performance in the test in combination with a reducer. As a result, the weight of the prototype motor was reduced by 54%, and a power density of 6.7 kW/kg was achieved.