Servo-free velocity estimator for coil driven actuator arm in a

Details Servo-free velocity estimator for coil driven actuator arm in a Servo-free velocity estimator for coil driven actuator arm in a

1998-02-26

1999-10-05

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7809, 360 75, 318560, G11B 555

Patent

active

059633930

ABSTRACT:
A system and method for determining the velocity and/or position of a coil driven actuator arm without the aid of servo signals. A sample-hold unit is used to measure no-motion coil voltage in the voice motor coil while applying a predetermined coil current. Then, while the same magnitude (opposite direction) current is applied to move the actuator arm, the coil voltage is measured. The coil voltage is reduced by the measured no-motion coil voltage, producing a measurement of back-emf. The back-emf may be amplified by a predetermined factor to yield an estimation of velocity, and this amount may be integrated to provide a gauge of relative actuator arm position.

REFERENCES:
patent: 4168457 (1979-09-01), Rose
patent: 4524398 (1985-06-01), Fujiki
patent: 4691152 (1987-09-01), Ell et al.
patent: 4755892 (1988-07-01), Carteau
patent: 4864437 (1989-09-01), Couse
patent: 4920462 (1990-04-01), Couse et al.
patent: 4933785 (1990-06-01), Morehouse et al.
patent: 4967291 (1990-10-01), Touchton et al.
patent: 5119250 (1992-06-01), Green et al.
patent: 5329409 (1994-07-01), Hampshire
patent: 5363359 (1994-11-01), Lee
patent: 5485323 (1996-01-01), Anderson et al.
patent: 5615064 (1997-03-01), Blank et al.
R.E. Eaton et al., "Improved Back Electromagnetic Force Voice Coil Motor Controller", IBM Technical Disclosure Bulletin, vol. 38, No. 11, Nov. 1995, pp. 315-316.
"Delta Voltage Control During Actuator Retract", IBM Technical Disclosure Bulletin, vol. 35, No. 1B, Jun. 1992, pp. 337-339.

Affiliated with

Also associated with

Rating

Servo-free velocity estimator for coil driven actuator arm in a does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Servo-free velocity estimator for coil driven actuator arm in a , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Servo-free velocity estimator for coil driven actuator arm in a will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1178778