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To reduce the iron loss, motor cores are designed with many layers of silicon steel sheets, and these sheets are elastically joined using the embossed regions. In this study, we investigate how the embossing position affects the joining strength using 0.5-mm-thick silicon steel sheets. Specifically, we embossed and stacked pairs of rectangular specimens and then conducted separation tests. The separation force increased as the embossing position moved further from the specimen’s edge. In addition, finite element analysis predicted the radial compressive stress of the interlocked projections, and it exhibits similar variation to the experimentally measured separation force with the changing embossing position.

An investigation of the joining strength of laminated steel sheets connected through embossed projections