| 摘要 |
An actuator comprises a magnet yoke (10a, 10b) and a carrier member (20) movable relative to the magnet yoke. The magnet yoke (10a, 10b) has at least one permanent magnet (14) and the carrier member (20) is positioned in the magnetic field produced by this magnet. The carrier member (20) has an auxiliary magnetic member (28) that produces a relative bias force between the carrier member (20) and the magnet yoke (10a, 10b). The bias force can be used to compensate for a weight applied to the device, such that it acts as a bearing with a very large compliance. The carrier member (20) also comprises a coil (26). Passing current through the coil (26) produces a Lorentz force which can be used for further control of the actuator; alternatively, the device can be used as a velocity transducer by sensing the EMF generated in the coil by relative motion of the carrier member (20) and magnet yoke (10a, 10b). <IMAGE> |
