| 摘要 |
PURPOSE:To improve efficiency by supplying a main coil with currents in a first half region and feeding a sub-coil with currents by energy stored in the main coil in a second half region. CONSTITUTION:At the time of starting, a main switch 13 and a circuit changeover switch section 11 are closed, and current is made to flow through a main coil 1. When a current value reaches a set current value, the circuit changeover switch section 11 is turned OFF. Consequently, a movable core 5 is moved to a constraining position 16 where the magnetic force of the main coil 1 is stabilized. Following the above, a semiconductor control conducting element 6 is conducted, and a sub-coil 2 is supplied with current by an energy stored in the main coil 1. Accordingly, the movable core 5 is shifted to an opposed position 15. When the movable core 5 is detected by a position detector 31, a positional signal is applied to a return signal terminal 32, and the movable core 5 is returned. |
