Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Synchronizing moving-head moving-record recorders
Patent
1997-06-30
1999-11-09
Ometz, David L.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Synchronizing moving-head moving-record recorders
360 7303, 360 75, G11B 1920, G11B 2102
Patent
active
059825715
ABSTRACT:
A disk drive having: (a) at least one data disk; (b) a brushless DC motor coupled to the data disk, the motor having: (i) multiple phase windings arranged as a stator, and (ii) a rotor having a permanent magnet or a DC current excitation winding for rotating the data disk; (c) a transducer for writing data to or reading data from the data disk; (d) a carrier supporting the transducer; (e) a voice coil motor coupled to the carrier for moving the carrier radially across the disk; (f) a drive controller coupled to the brushless DC motor and to the voice coil motor; and (g) a support for supporting the brushless DC motor, the voice coil motor and the drive controller. The drive controller periodically samples the rotor position and then drives the motor by energizing appropriate phase windings in relation to the rotor position that provide maximum forward torque to the rotor. While driving the motor, the drive controller also applies a series of current pulses to the VCM to oscillate the head carrier radially in and out. The combined application of maximum torque to the rotor and oscillation of the head carrier overcomes stiction between the slider and the surface of the disk to rotate the disk.
REFERENCES:
patent: 4530021 (1985-07-01), Cameron
patent: 4589036 (1986-05-01), Bertschy et al.
patent: 4897743 (1990-01-01), Kohno
patent: 4970610 (1990-11-01), Knappe
patent: 5018029 (1991-05-01), Ekhoff et al.
patent: 5117315 (1992-05-01), Nagasaki et al.
patent: 5191270 (1993-03-01), McCormack
patent: 5254914 (1993-10-01), Dunfield et al.
patent: 5397971 (1995-03-01), McAllister et al.
patent: 5530602 (1996-06-01), Boutaghou et al.
patent: 5717298 (1998-02-01), Tang et al.
patent: 5801505 (1998-09-01), Lee et al.
IBM Technical Disclosure Bulletin, "Hard Disk Drive Spindle Motor Excitation Function", vol. 32, No. 3B, pp. 40-41, Aug. 1989.
IBM Technical Disclosure Bulletin, "Magnetic Recording File with Data Recovery Capability and a High Start Torque Spindle Driver", vol. 31, No. 12, pp. 40-41, May 1989.
Calfee Gary W.
Jeppson David B.
Ometz David L.
Quantum Corporation
Zarrabian Michael
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