METHOD OF MAGNETIZING PERMANENT MAGNET

PROBLEM TO BE SOLVED: To magnetize a permanent magnet even in the case that sufficient magnetizing field strength is hard to get, by performing magnetization after heating a permanent magnet until the tenacity of the permanent magnet falls under the magnetizing field intensity, and cooling it to room temperature, keeping it so that the permeance coefficient may be the straight part of a demagnetization curve. SOLUTION: A permanent magnet 3 is set between the pole pieces of a magnetizer, being caught with SS-41 ferromagnetic substances having heaters 100mm in diameter and 10mm in thickness. Next, an Nd-Fe-B magnet part is heated t0 140 deg.C by the heater, and a magnetizing field is applied to it to perform magnetization. The intensity of magnetizing field at this time is 8kOe. After magnetization of the magnet, the magnetizing field is removed, and an SS-41 ferromagnetic substance yoke is attached so that the SS-41 ferromagnetic substances catching the magnet may close the magnetic circuit. After attachment, the magnet and the SS-41 ferromagnetic substances are removed from a magnetizer while being set, and they are cooled to room temperature. As a result, even in case that enough magnetizing field intensity is hard to get, magnetization can be made.