Amorphous alloy is widely used in fabricating the core and shield part of transformers because of its low loss characteristic. However, it also suffers the disadvantages of low saturation flux density and great magnetostrictive effect. In this paper, a hybrid magnetic core structure is proposed to release above problems: specifically, oriented silicon steel (GOES) is utilized to design the inner core to improve the working flux density and reduce the vibration while the amorphous alloy is used to design the outer core to reduce the core loss. First, an equivalent magnetic circuit model of the hybrid magnetic core is established. The permeability of adopted two soft magnetic materials is iterated for obtaining accurate flux density distribution in each section of the hybrid magnetic core. In addition, the vibration and noise analysis model of the magnetic core is developed, and the calculated performance is verified by the measured results. Finally, the performance of a three‐phase five‐column transformer designed with the hybrid magnetic core is compared with the benchmark transformer with the amorphous alloy and GOES cores. © 2026 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.
Liu et al. (Fri,) studied this question.