Active vibration isolation device

摘要

An active vibration isolation device includes: a housing fixed to a vibration isolation target; a movable shaft elastically supported by the housing displaceably in an axial direction; a yoke having an umbrella-shaped part provided consecutively and coaxially with the movable shaft and a circular cylindrical part provided consecutively with an outer circumference of the umbrella-shaped part and coaxially with the movable shaft; a ring-shaped coil fixed between the movable shaft and the cylindrical part; and first and second permanent magnets in a ring shape attached to the yoke. The first permanent magnet is smaller in diameter than the coil and is disposed inside the coil in a radial direction of the coil. The second permanent magnet is larger in diameter than the coil and is disposed outside the coil in the radial direction so that part thereof is made to face an inside of the yoke.

主权项

1. An active vibration isolation device comprising:
a housing fixed to a vibration isolation target; a movable shaft supported by the housing via an elastic member that allows the movable shaft to move in an axial direction thereof; a yoke coaxially provided with the movable shaft and having an umbrella-shaped part radially extending from the movable shaft and a cylindrical wall part axially extending from an outer circumference of the umbrella-shaped part; a first ring-shaped permanent magnet attached to the yoke; a ring-shaped coil that is fixed to the housing and disposed radially outside relative to the first ring-shaped permanent magnet; and a second ring Shaped permanent magnet attached to an inner surface of the cylindrical wall part of the yoke so as to face radially inward and disposed radially outside relative to the ring-shaped coil.