IEC 63182的这一部分规定了对机械性能非常重要的尺寸 磁性材料制成的环形磁芯（也称为环形）首选范围的互换性 粉末，计算中使用的有效参数值，并给出 适用于涂层环芯的表面不规则允许极限指南。购买本文件时可获得的所有当前修订均包含在购买本文件中。

This part of IEC 63182 specifies the dimensions that are of importance for mechanical interchangeability for a preferred range of ring-cores (also called toroids) made of magnetic powder, the effective parameter values to be used in calculations involving them, and gives guidelines on allowable limits of surface irregularities applicable to coated ring-cores.All current amendments available at time of purchase are included with the purchase of this document.