| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a coercive force specification method for a coercive force distribution magnet, that accurately specifies coercive force (average coercive force) in an arbitrary portion (a virtually divided arbitrary area) of the coercive force distribution magnet without destroying the coercive force distribution magnet, etc. <P>SOLUTION: A coercive force specification method includes: a step for virtually setting multiple division areas A1-A7 extending in an easy magnetization direction with respect to an arbitrary plane of a coercive force distribution magnet E, arranging the areas in a reverse magnetic field providing device 10, and generating demagnetization curves intrinsic to the respective division areas on the basis of measurement results from search coils 3a-3g corresponding to the respective division areas; a step for performing the second order differential of each demagnetization curve and specifying a magnetic flux density Bx of an inflection point indicating a demagnetization start point in the demagnetization curve; and a step for defining a recoil ratioμr being the material constant of the coercive force distribution magnet as the gradient of a straight line, substituting the previously specified Bx to Bx=-μHx+Br being a relational expression of a remanent flux density Br, coercive force Hx and the magnetic flux density Bx to obtain Hx in this case. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
