PURPOSE: To improve the efficiency of a magnetic circuit and reduce the consumed electric power and reduce the heat generation by installing bearings which are fixed onto a magnetic core and holds a movable element in vibration- enabled state.
CONSTITUTION: Bearings 60a and 60b are inserted into the opened port of a movable element 5, and a bearing 61a and 61b which is not shown on the figure are inserted into a through hole 63a, 63b which is not shown on the figure, and a bearing recessed part, and the bearings 60a and 60b are fixed onto the iron core of a core block 4 by screws, and the movable element 5 is held in the vibration-enabled ways in the state where the movement in the direction crossing at right angle with the vibration direction is restrained. With such constitution, the movable element 5 can be correctly positioned without obstructing the movement of the movable element 5. Therefore, the efficiency of a magnetic circuit can be improved by reducing the air gap to the necessary min. value, and the consumed electric power can be reduced by reducing the electric current which flows in a magnetic coil 31, and also the heat generation can be reduced.
NAKAYAMA SATOSHI
NAKATANI MITSUO
