Three-stable oscillating electromagnetic actuator

A three-stable oscillating electromagnetic actuator comprising:

• a cylindrical stator from which a plurality of first magnetic poles project toward a center direction;
• a mover that extends in a circumferential direction inside the stator and is reciprocatingly and rotatably supported along the circumference, the mover having an engaging convex portion formed on a rotation-direction end of the mover, the engaging convex portion projecting in a rotation direction;
• and
• a plurality of coils that are wound around the first magnetic poles and bias the mover to cause it to stop in three positions, which are a first stable position that is on one end side of a rotation range of the mover, a second stable position that is on the other end side, and a neutral third position that is an intermediate position,
• wherein the three-stable oscillating electromagnetic actuator further comprises a second magnetic pole that is made of a magnetic material and abuts against the rotation-direction end of the mover to stop the mover in the first stable position and the second stable position.