Modular Linear Actuator with Flat Coil Voice Coil Motor
Original Publication Date: 1981-Aug-01
Included in the Prior Art Database: 2005-Feb-12
Fig. 1 illustrates diagrammatically a magnet structure for a linear actuator in which a flat, rectangular coil armature may be moved with a force constant that varies less than 2% over the entire distance of its movement. The magnet structure comprises two pair of magnets 10U and 10L, an upper steel plate 11U, a lower steel plate 11L, and two steel side bars 13 and 14. A copper plate (not shown) may be attached to the inner surface of one of the steel plates 11 to reduce eddy currents.