| 摘要 |
<p>PURPOSE:To drive an electromagnet by low exciting currents by arranging a permanent magnet on the way of a magnetic circuit formed by an approximately E-shaped fixed core and a moving core and utilizing the attractive force of the permanent magnet for the drive operation of the electromagnet. CONSTITUTION:When an operating coil 3 is not excited, magnetic flux phi emitted from an N pole for a permanent magnet 10 reaches an S pole through a magnetic circuit C1. Attractive force based on magnetic flux phi works to a moving core 2 in an abutting section at that time, and the core 2 is held to a magnetic pole section 1c. When the coil 3 is excited at that time, magnetic flux PHI following up to electromotive force is generated, and a magnetic circuit C2 is formed in stantaneously. Consequently, magnetic flux PHI and magnetic flux PHI mutually deny near the abutting section 12, attractive force by magnetic flux PHI is annihilated and the core 2 is attracted to the fixed core 1 side, and the magnetic circuits C3, C4 of magnetic flux PHI, phi are shaped and attractive force acquired by adding magnetic flux phi, PHI is applied to the cores 1, 2. When the coil 3 is not excited, the core 2 is returned to an original state by a trip spring 8.</p> |
