| 摘要 |
PURPOSE:To increase tractive and repulsive forces generated between a fixed magnetic head and movable magnetic pole by arranging magnets having penetrating space through which a movable magnetic pole can reciprocate on both the axial sides of the penetrating space of an electromagnetic coil so that the same poles of the electromagnets may be opposite to each other. CONSTITUTION:A space 11 formed of permanent magnets 5, electromagnetic coils 7 and permanent magnets 9 under a fixed magnetic head 3 communicates with a piston cylinder 15 through a circular hole 13 formed on the lower part of a yoke 1. The lower end of the piston cylinder 15 opens toward a chamber 12 with check valves 17, 19. A cylindrical movable magnetic pole 25 having a cylindrical piston 23 fixed to its lower end is provided movably in vertical direction in the space 11.
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