Actuator for linearizing torque in a disk drive system

Details Actuator for linearizing torque in a disk drive system Actuator for linearizing torque in a disk drive system

1990-05-02

1991-04-02

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Drum record

360107, 360 9701, 310 36, G11B 555

Patent

active

050050958

ABSTRACT:
An improved rotary actuator for torque linearization in a disk drive recording system is described. A notch is formed in the actuator frame at a point midway along one of the sidewalls of a pair of circumferential slots which define a centerpole member therebetween. These slots house the actuator coil. The notch increases the air gap between the coil and the frame at the midpoint of the data stroke. This reduces the flux density at the midpoint of the data stroke which linearizes the torque of the actuator as a function of the angular position of the coil (i.e., the coil arc). In addition, the dimension of the centerpole member which extends beyond the sweep of the coil during a data stroke is widened to decrease the air gap in these regions.

REFERENCES:
patent: 4135119 (1979-01-01), Brosens
patent: 4462054 (1984-07-01), Dong et al.
patent: 4686397 (1987-08-01), Beeker
patent: 4805055 (1989-02-01), Wright
patent: 4908816 (1990-03-01), Champagne et al.
Patent Associated Literature, IBM Journal of Research and Development, vol. 20, No. 4, pp. 389-397, Jul. 1976, by Heath.
Brown et al., "Time-Optimal Control of a Moving Coil Actuator", IBM Journal Research and Development, Sep. 1968, pp. 372-379.
Honds et al., "A Linear D.C. Motor With Permanent Magnets", Philips Technical Review, No. 11/12, pp. 329-337, 1982.
Hiyane et al., "Development of Linear Motion Actuator", Fijitsu Scientific & Technical Journal, Jun. 1972, pp. 59-82.

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