Modeling Interlocking Effects on Core Losses in Electrical Steel

摘要

When optimizing the design of electrical machines, it is recommended to take into account the effect of the manufacturing processes on the core losses and magnetic properties of the electrical steel. This paper demonstrates a methodology for incorporating the effects of interlocking, a process frequently applied to fix a stack of laminations, on the magnetic properties of the machine core. The methodology requires magnetic measurements on several sets of Epstein strips. The proposed methodology is demonstrated on NO27, a low loss grade of electrical steel. A validation is done to show the transferability from Epstein strips to a realistic stator core geometry. The results show that the proposed methodology succeeds accurately in predicting the degrading impact of interlocking on the magnetic properties of electrical steel laminations. Additionally, the effect of magnetic anisotropy on the degrading impact of interlocking is investigated. (c) 2020 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.