Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1985-11-29
1988-11-22
Cardillo, Jr., Raymond F.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360105, 318331, 318561, 318578, G11B 554
Patent
active
047869941
ABSTRACT:
A DC motor drives a magnetic disk memory transducer head between a position proximate the disk periphery to an area on the disk where data are located during which time the head is lowered from an idle to a hovering position. During this time the motor is supplied with a current impulse having a predetermined polarity, amplitude and duration. The polarity of the current impulse is opposite to that of current applied to the motor while the head is being driven between a position beyond the disk periphery to the position proximate the disk periphery. The duration and amplitude of the current impulse are such that the motor angular velocity has a zero value at the completion of the current pulse. Thereafter, a ramping voltage having an average linear waveform is applied to the motor to prevent overshoot of the motor speed and prevent oscillation of the head relative to a face of the disk. The linear ramp current decreases to a zero value, at which time the motor has a constant, non-zero angular velocity.
REFERENCES:
patent: 4202020 (1980-05-01), Lougren et al.
patent: 4571648 (1986-02-01), Barski
patent: 4660106 (1987-04-01), Harrison et al.
Carteau Daniel
Couette Jean-Jacques
Dan Tam Pham
Maury Christian
Cardillo, Jr. Raymond F.
CII Honeywell Bull
Garland Steven R.
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