Small form factor actuator for improved functionality and linear

Details Small form factor actuator for improved functionality and linear Small form factor actuator for improved functionality and linear

1994-05-19

1995-10-17

Dougherty, Thomas M.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 13, 335296, H02K 3318

Patent

active

054593620

ABSTRACT:
A voice coil motor (VCM) for a small form factor hard disk drive having a contoured flux field in the air gap wherein adjoining regions of oppositely directed magnetic flux form a transition zone. In the preferred embodiment, the magnetic structure assembly is contoured or shaped. The magnetic structure assembly comprises pole pieces and magnets. The shaping may be of either of the pole pieces or of either of the magnets. The shaping may be along the top edge only, along the bottom edge only, or along both edges. Alternatively, the shaping may be accomplished in the transverse plane, that is by shaping the profile in thickness. The shaping can be done so that when the flux is falling in one gap it is rising in the other gap. In this manner, the sum of the flux in the two gaps remains the same.

REFERENCES:
patent: 4908816 (1990-03-01), Champagne et al.
patent: 5119253 (1992-06-01), Kotani
patent: 5122702 (1992-06-01), Nakazato
patent: 5122703 (1992-06-01), Takahashi et al.
patent: 5168184 (1992-12-01), Umehara et al.
patent: 5175457 (1992-12-01), Vincent
patent: 5254914 (1993-10-01), Dunfield et al.
patent: 5260618 (1993-11-01), Dunfield et al.
Article: "Moving Coil VCM: Feasibility Study of an Alternative Design", John Dunfield, Kamran Oveyssi, Date unknown.

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