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The figures illustrate a voice coil motor which has been constructed to minimize the nonlinearity and variations of the push-pull forces normally associated with prior-art voice coil motors.
English (United States)
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Complementary Forces Voice Coil Motor
The figures illustrate a voice coil motor which has been constructed to
minimize the nonlinearity and variations of the push-pull forces normally
associated with prior-art voice coil motors.
The improved voice coil motor 9 is shown in Figs. 1a and 1b with the moving
coil omitted for clarity. The motor 9 comprises an outer housing 10 which may be
steel tubing, a pair of magnets 11A and 11B which, as shown, are circular in
cross-section and may be made from ceramic magnetic material, and inner
concentrating poles 13A and 13B which also may be made of steel tubing. The
motor further comprises a center pole piece 15 of solid circular cross-section
which is attached to a non-magnetic baseplate 16, the circumferential side 17 of
which attaches to the housing 10. An inductance ring 18, consisting of copper,
may also be inserted adjacent to the steel concentrating poles 13, as shown.
The basic subassembly shown in Figs. 1a and 1b is advantageously
assembled by shrink fitting the various elements having circular cross-sections
onto each other.
Fig. 2 shows a cross-section of the motor illustrating the magnetic polarity of
the magnets 11A and 11B and shows the coil winding for the movable coil 19
which surrounds center pole 15 and moves in the annular flux gap 20 defined by
pole piece 15 and ring 18.
Fig. 3 shows the free body diagrams illustrating the various forces involved
on the moving coil in the push direction and the pull direct...