METHOD OF IMPROVING MAGNETIZING PROPERTIES BY AC OR PULSE CURRENTS

摘要

PURPOSE: To increase saturation magnetic induction (saturation flux density) and lower min. coercive force by flowing an a-c or pulse current in a ferromagnetic body in its magnetizing process. CONSTITUTION: A ferromagnetic test piece 2 passes through a magnetic field induced by a magnetizing coil 1 to magnetize the piece 2, while an a-c or pulse current from an a-c power source 3 flows in the piece 2. Accordingly, the magnetic domains in the ferromagnetic body are considered to be more easily movable, according to the current density and frequency. Thus a ferromagnetic material is obtained which has a high magnetic induction (flux density) and a low coercive force, and results in the performance curve (hysteresis loop) of the ferromagnetic body being high and narrow so as to reduce the hysteresis loss.