Journal: IEEE Transactions on Industry Applications
Authors: Du-Ha Park, Jae-Hyun Kim, Hyun-Su Kim, Jin-Cheol Park, Yun-Jae Won, Tae-Gun Lee, Myung-Seop Lim
DOI: 10.1109/TIA.2026.3708817
This paper aims to develop a fast and reliable core-loss calculation method for induction motors (IMs) that accounts for slot harmonics, thereby reducing the computational burden during the design of high-efficiency traction motors. In traction applications, induction motors frequently operate in the high-speed region. In this region, harmonic iron losses increase significantly, making their accurate prediction essential for achieving high efficiency. However, accurately evaluating these harmonic effects generally requires transient FEA with high temporal resolution, which leads to excessive computational time and makes optimization-based design workflows impractical. To address this challenge, this paper proposes a computationally efficient and accurate core-loss evaluation procedure based on a slot-harmonic frequency scaling method, in which harmonic flux-density components of each element at target operating speeds are analytically scaled from a single 2-D transient FEA performed at a reference speed. This approach significantly reduces computational time while preserving core-loss accuracy, making it well suited for large-scale motor design optimization.