Amorphous metal stacked cores

Various single phase amorphous metal stacked cores, including: a miter cut step lap core, a miter cut butt lap core, and an I-plate core, were processed for evaluation. The performance of a stacked core depends upon among other things the type of core joint, the number of laminations in a group in core stacking, and the pressure applied to the core. A miter cut step lap core performed the best followed by a miter cut butt lap core, and then an I-plate core. The single phase I-plate core, which had a core loss of less than one third that of M-4 grade grain oriented silicon iron, was easier to stack than the miter cut cores. There is optimism that amorphous metal can be used for stacked core power transformers. This work was sponsored by the Electric Power Research Institute, Inc., of Palo Alto, California, Project No. RP1290-2, titled "METGLAS^R Magnetic Material for Transformer Cores".