Patent ID: 8322024
Filing Date: 2012-12-04
Classification: G01R,H01F,Y10T

Abstract:
1. A method of manufacturing a magnetic field generator including an R—Fe—B magnet and a yoke holding the R—Fe—B magnet, the method comprising: a first step of assembling the R—Fe—B magnet and the yoke into the magnetic field generator, while the R—Fe—B magnet is in a generally saturated state of magnetization, and then performing a second step of demagnetizing the R—Fe—B magnet by heating, at a temperature not lower than 40° C. and not higher than 70° C., the magnetic field generator, including at least the yoke and the R—Fe—B magnet, which has already been assembled, whereby the R—Fe—B magnet is controlled to have a magnetization rate not smaller than 80% and not greater than 99.9% at the normal temperature.