Electromagnetic force valve driving apparatus

An apparatus for driving a suction/exhaust valve of an engine by an electromagnetic force in opening and closing directions, comprising:

• at least one movable permanent magnet connected to the suction/exhaust valve and having a pair of magnetic poles arranged with a predetermined spacing in a direction in which the suction/exhaust valve is driven and including an end face of a side of said movable permanent magnet;
• a plurality of fixed magnetic poles disposed to oppose the magnetic poles of said movable permanent magnet and arranged with a different spacing there between then the predetermined spacing;
• a plurality of fixed excitation coils wound on respective ones of said fixed magnetic poles so that the fixed magnetic poles can be excited;
• energizing control means for controlling passage of current through said fixed excitation coils so that an electromagnetic force can act between the magnetic poles of said movable permanent magnet and said fixed magnetic poles, thereby driving the suction/exhaust valve in one of the opening and closing directions;
• and
• an upper fixed electromagnet disposed to oppose the end face of said movable permanent magnet so that said suction/exhaust valve, can be subjected to a first force acting in the opening direction when an operation for opening said suction/exhaust valve begins.