| 摘要 |
PURPOSE:To simplify a magnet coil in structure by forming winding phase of the magnet coil into a single-phase structure, and making a reversible current so as to flow in the magnet coil according to height of a control pulse. CONSTITUTION:Winding phase of a magnet coil 11 is formed into a single-phase structure. When a control pulse to be impressed on a power source 6 is in high voltage, open-side transistors 12, 13 are conducted, and a current flows into the magnet coil in its forward direction. When the control pulse is in low voltage, closed-side transistors 14, 15 are conducted, and the current flows into the magnet coil in its reverse direction. Accordingly, electromagnetic force in both valve opening and closing directions can be generated by a single-phase structural coil. With this constitution, a temperature difference is in no case produced in the magnet coil, and thus a flow characteristic conformed to a duty of the control pulse is secured. |
