To perform powerful magnetization efficiently, quickly and inexpensively such that deficient magnetization does not occur even in case of a multipolar ring permanent magnet having an extremely small diameter and a narrow magnetization pitch and in which magnetization quality can be enhanced, initial demagnetization does not take place and surface flux density can be adjusted finely.
In the method for magnetizing a permanent magnet by applying a magnetization field from a magnetizing section to an article being magnetized, i. e. a permanent magnet, and applying a magnetization field continuously while lowering the temperature of the article from above the Curie point down to the Curie point, temperature at the magnetizing section when the article is taken out therefrom is controlled to a point higher than the upper limit of working temperature or the guarantee temperature of an electromagnetic device being incorporated in the article thus preventing initial demagnetization and regulating surface flux density of the article depending on the temperature at the magnetizing section by utilizing thermal demagnetization action.
KITAOKA MIKIO
OHASHI IKUO
KIYOMIYA TERUO
NIIMURA SACHIKO
SUZUKI MASUTARO
| JP2004071853A | 2004-03-04 | |||
| JPS6289313A | 1987-04-23 | |||
| JPS61121405A | 1986-06-09 | |||
| JPH07220924A | 1995-08-18 | |||
| JPH0372606A | 1991-03-27 | |||
| JPH03233910A | 1991-10-17 |
Next Patent: RUPTURING METHOD FOR ADHESIVE FILM