LINEAR MOTOR ACTUATOR

Provided is a linear motor actuator capable of oscillating a mover without using mechanical resilience of an elastic body. A first permanent magnet 3a and a second permanent magnet 3b magnetized in an axis direction are disposed in a mover 4 in the direction of the axis. A first coil 1a and a second coil 1b are disposed in a stator 2 so as to surround the first permanent magnet 3a and the second permanent magnet 3b, respectively. Alternating currents having the same phase are applied to the first coil 1a and the second coil 1b such that the phase of thrust generated in the first coil 1a and that of thrust generated in the second coil 1b are shifted from each other. At this moment, a center-to-center pitch LC1 between the center of the first coil 1a and that of the second coil 1b in the axis direction differs from a pole-to-pole pitch LM1 of the mover.