Fast calibration using microsteps

Details Fast calibration using microsteps Fast calibration using microsteps

1995-06-07

1996-10-15

Voeltz, Emanuel T.

Boots, shoes, and leggings

360 7809, 369 4429, 369 4435, G11B 5596

Patent

active

055660959

ABSTRACT:
A direct access storage device (DASD) employs a servo including a digital signal processor having a software switch (DSP). The DSP is provided with DSP code in a DSP code space. One of the functions of the DSP code is to implement the microstep calibration of the present invention. Microstep calibration is accomplished by a step change of head position within a single track. In head position 1 the head is at the center of the track in track follow mode. From head position 2 to head position 3, an offset command causes the servo to move the head slightly off center. From head position 3 to head position 4, the servo is disabled by opening the software switch in the DSP. The position delta, delta 3-4, of the head is recorded. From position 4 to position 6, the servo is still disabled and a step of current is applied to the VCM to determine position delta 2. From position 7 to position 8, the servo is still disabled and two steps of VCM current are applied to recover to the offset position. From position 9 to position 10, the servo is enabled by operating the software switch within the DSP with the offset still applied and the result is that the offset position is re-established. Delta 3-4 and delta 4-6 are used to determine the system gain. The measured gain is applied to the DSP as a kgain parameter which is used by the DSP to correct for variation and measured system gain.

REFERENCES:
patent: 4419701 (1983-12-01), Harrison et al.
patent: 4679103 (1987-07-01), Workman
patent: 4697127 (1987-09-01), Stich et al.
patent: 4835633 (1989-05-01), Edel et al.
patent: 4914644 (1990-04-01), Chen et al.
patent: 5119248 (1992-06-01), Bizjak et al.
patent: 5119254 (1992-06-01), Brown et al.
patent: 5126897 (1992-06-01), Ogawa et al.
patent: 5227930 (1993-07-01), Thanos et al.
patent: 5258940 (1993-11-01), Coker et al.
patent: 5268848 (1993-12-01), Coker et al.
patent: 5305160 (1994-04-01), Funches et al.
patent: 5309075 (1994-05-01), Yokoe et al.
patent: 5313589 (1994-05-01), Donaldson et al.
patent: 5333140 (1994-07-01), Moraru et al.
patent: 5473550 (1995-12-01), Cameron et al.

Affiliated with

Also associated with

Rating

Fast calibration using microsteps does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Fast calibration using microsteps, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fast calibration using microsteps will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1252118