| 摘要 |
PURPOSE:To enable saturated magnetization in a lower magnetizing magnetic field without reducing the efficiency of magnetizing work by applying a specific high frequency magnetic field to a permanent magnet made of an intermetallic compound whose main components are a rare earth metal and a transition metal. CONSTITUTION:A permanent magnet made of an intermetallic compound whose main components are a rare earth metal and a transition metal is magnetized by applying a pulse magnetic field after applying a 10 KHz-50 MHz high frequency magnetic field. The high frequency loss generated when the high frequency magnetic field is applied to a rare earth magnet is transformed to heat and the rare earth magnet generates heat by itself. The coercive force of the rare earth magnet reduces with the rise of temperature. Accordingly, saturated magnetization becomes possible in a lower magnetizing magnetic field. When the frequency of the high frequency magnetic field becomes under 10 KHz, the high frequency loss becomes smaller, the rise of the temperature of the rare earth magnet becomes slow and the efficiency of magnetizing work is reduced. Meanwhile, if the frequency becomes over 50 MHz, to obtain a great intensity high frequency magnetic field becomes difficult and industrial merits are lost due to a greater and higher cost power source. |
