| 摘要 |
<p>PURPOSE:To drive a polar hinge type electromagnet by low exciting currents by arranging a permanent magnet on the way of a magnetic circuit formed by a fixed core composed of one main magnetic pole and two sub-magnetic poles 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 from an N pole for a permanent magnet 10 forms a magnetic circuit C1 passing through a first sub-pole section 1b a main pole section 1a a second sub- pole section 1c a moving core 2 a pole piece 11, and the core 2 is attracted to the magnetic pole 1c by attractive force based on magnetic flux phi. When the coil 3 is excited at that time, magnetic flux PHI following up to electromagnetic force is generated, and a magnetic circuit C2 is shaped. When the core 2 is attracted to a fixed core 1 by the magnetic flux PHI and brought into contact with the core 1, magnetic circuits C3, C4 are prepared, and the core 2 is held by the additive attractive force of the circuits C3, C4. When the coil 3 is not excited under this state, the core 2 is returned to an original state by a trip spring 8, and the core 2 is magnetically held stable by magnetic flux PHI.</p> |
