Electromagnetic actuator for voice coil

Details Electromagnetic actuator for voice coil Electromagnetic actuator for voice coil

1974-11-25

1976-10-05

Budd, Mark O.

Electrical generator or motor structure

Dynamoelectric

Linear

310 14, 310154, H01L 4102

Patent

active

039847063

ABSTRACT:
An electromagnetic actuator for linear driving of movable heads of a magnetic disc unit in an information processing system. A plurality of slits or plates are provided with a magnetic pole inscribed directly on the internal surface of a permanent magnet, and increase magnetic reluctance of the magnetic path and reduce inductance of a moving coil, thus providing shorter positioning time and stable control. In order to obtain the constant strength of magnetic flux and/or torque of a moving coil, said slits or plates have a particular structure.

REFERENCES:
patent: 2906899 (1959-09-01), Geneslay
patent: 3296471 (1967-01-01), Cochardt
patent: 3376578 (1968-04-01), Sawyer
patent: 3502918 (1970-03-01), Done et al.
patent: 3828213 (1974-08-01), Yamashita et al.
patent: 3836801 (1974-09-01), Yamashita et al.

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