Voice coil motor

Details Voice coil motor Voice coil motor

1991-12-31

1993-01-05

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Linear

310 12, 360 7813, H02K 4100

Patent

active

051773830

ABSTRACT:
A voice coil motor is disclosed which conveys a head of optical or magneto-optical disk drive or magnetic disk drive as a kind of a linear motor. The motor comprises a yoke member composed of a central portion, upper/lower fringes and left/right fringes forming magnetic paths, permanent magnets being adhered on the upper/lower fringes of the yoke member and each having an air gap with respect to the central portion. A moving coil is wound slidably around the central portion of the yoke member, and a shorted turn offsets the magnetic flux due to the current flowing in the moving coil, wherein the shorted turn has a plurality of fins on its conductive sleeve-shaped body and is disposed primarily in the yoke member except the section where the moving coil moves. The motor demonstrates an excellent control function while generating a maximum amount of thrust.

REFERENCES:
patent: 5051669 (1991-09-01), Hsiao et al.
"IEEE Transactions on Magnetics"; vol. 25, No. 4; pp. 3073-3075; Jul., 1989.

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