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公开(公告)号：JPS62209782A
公开(公告)日：1987-09-14
申请号：JP201187
申请日：1987-01-09
Applicant: IBM
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公开(公告)号：DE3682706D1
公开(公告)日：1992-01-16
申请号：DE3682706
申请日：1986-03-21
Applicant: IBM
Inventor： KILEN RICHARD SCOTT , RITTENHOUSE LARRY EDWARD
Abstract: @ The speed of a DC motor is controlled by a servo which includes a digital phase lock loop. The motor drives a tachometer whose pulse (22) frequency is low relative to the frequency of a clock - (21). The clock continuously drives a counter (200) whose ever increasing number content is gated to a data latch (26) upon the occurrence of each successive tachometer pulse, thus this data latch contains a first time-number of ever increasing magnitude. A second data latch (24) contains a second number. The difference in magnitude of two consecutive time-numbers is indicative of motor speed. Initially, this second number is set to contain a reference number (REF) which is equal in magnitude to the number of clock pulses which will occur between adjacent tachometer pulses when the motor is running at desired speed. A pair of limit numbers - (RANGEL and RANGEH) are provided to define the upper and lower limits of servo saturation. The difference between the first number and the second number is detected upon the occurrence of each tachometer pulse to generate a third or difference number (ERRA). This difference number is compared to the two limit numbers to determine if the servo is in saturation. If it is not in saturation, the second number is reset to a value which is equal to the old value plus the reference number. If the servo is in saturation, the second number is reset to a number which is a function of the first number, the reference number, and that limit number which is associated with the particular mode of saturation.
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公开(公告)号：DE3774293D1
公开(公告)日：1991-12-12
申请号：DE3774293
申请日：1987-02-03
Applicant: IBM
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公开(公告)号：CA1236568A
公开(公告)日：1988-05-10
申请号：CA529772
申请日：1987-02-16
Applicant: IBM
Inventor： ASHBEE WILLIAM HENRY , KILEN RICHARD SCOTT , KIRTON ALAN JOHN , RITTENHOUSE LARRY EDWARD , VALENT JAMES ALFRED
Abstract: MAGNETIC HEAD POSITIONING APPARATUS AND METHOD An apparatus and method are disclosed for positioning magnetic heads relative to the recording tracks of a recording medium such as a floppy disk having circular, concentric recording tracks formed thereon. The magnetic heads are mounted on a head carriage, and the head carriage is moved, in response to received command pulses, so that the heads are moved linearly, by step increments, along a radius of the floppy disk. The heads are thereby moved across the spaced tracks on the disk, with each incremental movement of the heads being a distance less than the distance between the tracks, and being, for example, onehalf or one-fourth of the total distance between tracks. Acoustic noise due to head movement is minimized by moving the heads by increments less than the distance between the tracks, with such movement avoiding exciting the resonances of the head moving apparatus. The magnetic heads are initially moved at a rate known to avoid exciting the resonance and, during such initial movement, the rate of received command pulses is determined. If the received command pulse rate is within a predetermined range, and is a rate that will not excite resonance, continued movement of the head is at the rate of the received command pulses.
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