Patent ID: 9372244
Filing Date: 2016-06-21
CPC Classification: G01R,G06F,H01F,Y02T

Claim Text:
1. A magnetic force characteristic computing method for obtaining a magnetic force characteristic in a magnet prepared by introducing a heavy rare-earth element from a surface of the magnet and diffusing the heavy rare-earth element into an outer periphery of a main face of the magnet or in a magnet prepared by diffusing a heavy rare-earth element into a magnet, comprising: cutting at least one heavy rare-earth element diffused material into strips; measuring heavy rare-earth element concentration in the strips and measuring coercivity HcJ of the strips; preliminarily storing depth versus coercivity increment characteristic information describing distribution of the coercivity increment due to diffusion of the heavy rare-earth element versus depth from a surface of the material and an introduced heavy rare-earth element amount versus coercivity increment characteristic information describing a characteristic of the increment of the coercivity due to diffusion versus the introduced amount of the heavy rare-earth element; processing depth versus introduced amount characteristic information describing the introduced amount distribution of the heavy rare-earth element versus depth, from the stored depth versus coercivity increment characteristic information and the stored introduced amount versus coercivity increment characteristic information; receiving shape information on a dimension and a shape of the magnet; receiving introduced face information on one or a plurality of faces of the magnet where the heavy rare-earth element has been introduced, in accordance with the received shape information; computing for each face an introduced amount distribution in the magnet of the heavy rare-earth element introduced from the one or a plurality of faces based on the received shape information, the received introduced face information and the obtained depth versus introduced amount characteristic information; obtaining introduced amount distribution of the entire magnet from introduced amount distribution obtained for each face; and obtaining a distribution of a coercivity increment due to diffusion in the magnet based on the obtained introduced amount distribution in the entire magnet and the stored introduced amount versus coercivity increment characteristic information.