Electro-magnetic solenoid

Abstract

Abstract PURPOSE:To provide the titled solenoid with low wattage that does not develop excessively large attracting force at the final stage of attraction and has a low level of motion noise by moving the movable rod by means of a hydraulic pressure developed by the motion of a movable iron core and providing a large stroke for a small size rod. CONSTITUTION:In the figure 5 is a movable iron core, 6 is a fixed iron core, 7 is a hole pierced through the movable iron core, 8 is a movable rod inserted into the hole, 9 is a yoke, 10 is an exciting coil, 11 is a coil frame, and 12 is oil filled between the movable iron core 5 and the fixed iron core 6. The hole 7 is opened concentrically with the movable iron core 5. When electric current flows in the exciting coil 10, a magnetic field is formed between the fixed iron core 6 and movable iron core 5 and attracting force developed between them. By this force a presure is applied to the oil 12 between the movable iron core 5 and fixed iron core 6 and the movable rod 8 is pushed up. The cross-sectional area of the moving rod 8 is taken as S8 and the cross- sectional area of the movable iron core 5 as S5, the force F8 to push up the movable rod at this time is : F8=F5XS8/S5, supposing that the attracting force exerted on the movable iron core is F5. Accordingly the stroke of the movable rod 8 is S5/S8 times the stroke of the movable iron core 5.

Inventors

• 👤 Shunsaku Nakauchi
• 👤 俊作 中内

Bibliographic Details