Damping actuator and active vibration damping device equipped with the actuator

摘要

A damping actuator includes: an inner shaft member; an outer sleeve member disposed in a coaxial relationship with each other with a radial spacing therebetween such that the outer sleeve member being movable relative to the inner shaft member; a coil and an inner yoke disposed coaxially with and fixedly mounted to the inner shaft member so as to give inner magnetic pole portions; and a permanent magnet and an outer yoke fixedly mounted to the outer sleeve member so as to give outer magnetic pole portions. The outer magnetic pole portions are opposed to the inner magnetic poles in a radial direction perpendicular to an axial direction of the inner shaft member with a radial gap therebetween, and are offset from the plurality of inner magnetic poles in the axial direction. The coil is energized for generating magnetic axial driving force acting between said inner and outer magnetic poles so that the inner and outer magnetic poles are moved relative to each other in the axial direction. Damping devices equipped with the damping actuator are also disclosed.