ASSEMBLING AND MAGNETIZING METHOD FOR MAGNETIC CIRCUIT

摘要

PURPOSE:To enable to perform a complete magnetization in a weak magnetic field by a method wherein, in the assembled body of the magnetic circuit formed by providing a permanent magnet having R (at least a kind of rare-earth element containing Y), B and Fe as main ingredients, the permanent magnet is magnetized maintaining the specified range of high temperature. CONSTITUTION:An Fe-B-R permanent magnet consists of main ingredient of R of 8-30atm%, B of 2-28atm% and Fe of 42-90atm%, and its main phase consists of a pressure crystal phase, and Nd and Pr are used as R. A magnetizer has a plurality of magnetic poles whereon an electromagnetic coil 5 is wound around, a magnetic circuit consisting of an Fe-B-R magnet 1, a yoke 2 and a center pole 3 is provided thereon, and a high temperature is maintained in a high-temperature furnace within the temperature range of 50-140 deg.C, and the Fe- B-R magnet 1 is magnetized by applying a current to the magnetizer. As the above is assembled and magnetized in the high temperature atmosphere of 140 deg.C or below, the stabilization of heat ageing and the magnetization can be accomplished in one process.