Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1988-07-29
1992-01-07
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
318685, 318696, G11B 555
Patent
active
050796534
ABSTRACT:
The output of the ring detector is used to change or control the timing of specially generated torque damping pulses which are fed to the stepper motor at the end of a SEEK step sequence. These torque damping pulses are step pulses, the timing, amplitude and/or duration of which applies either a positive or negative torque to the stepper motor relative to the target track based on the "energy" that has to be dissipated to settle the read/write head over the desired track. The energy is measured indirectly by monitoring the back emf voltage of an open winding or unenergized phase of the motor, and developing an indication of how fast the read/write head is going through the desired track center or target track point. By bringing an additional signal out of the ring detector, the direction in which the read/write head has crossed the track can also be defined. Based on how fast the read/write head is going and in which direction, the microprocessor accesses a look-up table for selecting the timing, amplitude and/or duration of the damping pulse.
REFERENCES:
patent: 4282471 (1981-08-01), Budniak et al.
patent: 4422113 (1983-12-01), Mabon
Chan Litko R.
Gauthier Raymond G.
Krause James N.
Tremaine Brian P.
Canney Vincent P.
Garland Steven R.
Seagate Technology Inc.
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