Electromagnetic vibration damping actuator, fluid-filled active vibration damping device, and active vibration control device using the same

摘要

An electromagnetic vibration damping actuator (10) comprising: a tubular stator (68) including at least one coil member (72) having a coil (74) and an outer yoke (76) attached to the coil (74); a rotor (70) ), which contains a permanent magnet (104) and at least one inner yoke (106, 108, 120, 130) which is superimposed on the permanent magnet (104) in the axial direction of the stator (68), the rotor (70) in such a way in the tubular stator (68) is used so that the rotor (70) can be displaced in the axial direction relative to the stator (68) by exciting the coil (74); and an inner tubular part (81) which is arranged on the outer yoke (76) superposed on an inner peripheral surface of the coil (74) so that a magnetic gap (82) is formed on the inner tubular part (81), the electromagnetic vibration damping actuator ( 10) is characterized in that: the at least one inner yoke (106, 108, 120, 130) has a thick part (112, 124, 134) with a large axial dimension at its outer peripheral part and a relief part (110, 122, 132) which is formed on its inner peripheral part in such a way that an axial dimension of the inner yoke (106, 108, 120, 130) in a formation part of the relief part (110, 122, 132) is smaller than in the thick part (112, 124, 134 ), the lightening part (110, 122, 132) has a recess shape and the formation part of the lightening part (110, 122, 132) in the at least one inner yoke (106, 108, 120, 130) is a thin part (114, 126, 136) with a small its axial dimension is greater than the axial dimension of the thick portion (112, 124, 134), and the axial dimension of the thick portion (112, 124, 134) of the at least one inner yoke (106, 108, 120, 130) is greater than an axial dimension Dimension of the magnetic gap (82) is such that the inner yoke (106, 108, 120, 130) and the inner tubular part (81) of the outer yoke (76), viewed in a perpendicular direction, are superimposed on each other, and the axial dimension of the thin part (114, 126, 136) of the inner yoke (106, 108, 120, 130) is smaller than the axial dimension of the magnetic gap (82).