2023 Volume 31 Issue 2 Pages 291-296
This paper describes a secondary current heating method that allows flexible cooling control to reduce iron loss in laminated stator cores. In the secondary current heating method, the excitation coil generates a magnetic flux, which passes through the laminated stator cores to generate a secondary current. The laminated stator cores are directly heated by this secondary current. We aimed to further improve the magnetic properties by adding a new element to the secondary current heating method. Focusing on the cooling process, we performed heat treatment with flexible cooling control, and compared and investigated the magnetic properties and iron loss. As a result, heat treatment by secondary current heating can reduce iron loss by 31-51 %, but the newly proposed cooling control can further reduce iron loss by up to 6.5 %. The detailed results and discussions are presented in this paper.
