POWDER CORE, POWDER CORE MANUFACTURING METHOD, AND METHOD FOR ESTIMATING EDDY CURRENT LOSS IN POWDER CORE

摘要

An eddy current loss at a frequency of 3,000 Hz is set to less than 150 W/kg by setting a single particle diameter-equivalent diameter d s of soft magnetic metal powder represented by the following formula to 210 µm or less. In the formula, d s represents a single particle diameter-equivalent diameter of the soft magnetic metal powder [m], d MN represents a number average particle diameter of the soft magnetic metal powder [m], and à represents a standard deviation of the particle diameter of the soft magnetic metal powder [m]. d S = d M N 2 + 5 �¢ à 2 + 2 �¢ à 2 �¢ d M N 2 d M N 2 + 3 �¢ à 2