Minimum bearing load, high precision actuator arm with force cou

Details Minimum bearing load, high precision actuator arm with force cou Minimum bearing load, high precision actuator arm with force cou

1993-10-25

1996-06-04

Wolff, John H.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Drum record

G11B 555

Patent

active

055239110

ABSTRACT:
A head positioning system for a magnetic disk drive includes an actuator arm that is mounted on a pivot bearing so that the axis of rotation of the arm passes through the center of mass of the arm. A Faraday-type motor using a single coil applies a force couple to the arm at a location offset from the center of mass of the arm with a constant moment arm. The offset force couple creates a pure torque about the axis of rotation of the arm (that is, about the pivot bearing) in order to substantially eliminate reaction forces on the bearing; this greatly lessens wear on the bearing and in turn reduces the non-repeatable run-out error of the read/write head mounted at the end of the arm. Various arrangements of permanent magnets and motor windings are provided to create the force couple. Furthermore, in certain embodiments, yokes are included to increase the magnetic field strength of the motor, thus increasing its power and reducing magnetic leakage and the risk of disturbing the data stored in the magnetic disk medium.

REFERENCES:
patent: 4414594 (1983-11-01), Farmer
patent: 4707754 (1987-11-01), Patel et al.
patent: 5041935 (1991-08-01), Aruga
patent: 5295031 (1994-03-01), Wasson
"Large Scale Magnetic Disk Files," Hitachi Review, vol. 35 (1986), No. 2, pp. 85-90.
"Design of a High Performance Rotary Positioner For a Magnetic Disk Memory," IEEE Transactions on Magnetics, vol. Mag-17, No. 4, (Jul. 1981), pp. 1392-1395.
"Mechanical and Servo Design of a 10 Inch Disk Drive," IEEE Transactions on Magnetics, vol. Mag-17, No. 4, (Jul. 1981).

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