PERMANENT MAGNET SOURCE POWDER FABRICATION METHOD, PERMANENT MAGNET FABRICATION METHOD, AND PERMANENT MAGNET RAW MATERIAL POWDER INSPECTION METHOD

摘要

Provided is a permanent magnet source powder fabrication method, comprising: a step of preparing a raw material powder of a permanent magnet; a step of measuring a magnetism characteristic of the raw material powder of the permanent magnet; and a step of determining the quality as a source powder of the raw material powder on the basis of a predetermined relation between the magnetism characteristic and an organization of the raw material powder. Also provided is a permanent magnet fabrication method, comprising a step of integrating the raw material powder which is determined to be of good quality in the quality determination step from the permanent magnet source powder fabrication method as the source powder. Also provided is a permanent magnet raw material powder inspection method, which transmits a magnetic field to the raw material powder of the permanent magnet, receives a magnetic field from the raw material powder, and measures a magnetic field differential between the transmitted magnetic field and the received magnetic field as a magnetism characteristic of the raw material powder.