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The impact of laminations is to confine eddy currents to highly elliptical paths that enclose little flux, and so reduce their magnitude. Thinner laminations reduce losses,[27] but are more laborious and expensive to assemble.[31] Thin laminations are usually used on high-frequency transformers, with some of very thin steel laminations in a position to operate up to 10 kHz. Transformers for larger frequency applications corresponding to SMPS usually use core materials with a lot lower hysteresis and eddy-current losses than these for 50/60 Hz. The lower frequency-d