Effect of Cutting Technology on the Soft Magnetic Properties of Nanocrystalline Cut Cores

Abstract:
Nanocrystalline wounded ribbon cores of the Vitroperm alloy have the lowest coercivity of all soft magnetic materials. Additionally, eddy current losses are very low due to thin ribbons of only about 18 µm. Therefore, wounded nanocrystalline toroids are the perfect choice especially for high frequency applications. For parts integration it would be advantageous to prepare cut cores. However, cutting of the nanocrystalline ribbons is affecting the magnetic properties extensively because they are very brittle. Therefore, the effect of different cutting technologies on the magnetic properties of the cut cores is analyzed as well as the impact of the type of resin used for infiltration. As a result, cut cores prepared with a bonded ceramic cutting disc show the best soft magnetic properties.