Method and apparatus for controlling head velocity in a disk...

Details Method and apparatus for controlling head velocity in a disk... Method and apparatus for controlling head velocity in a disk...

2007-03-20

2007-03-20

Sniezek, Andrew L. (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S078040, C360S078120, C318S560000, C318S254100

Reexamination Certificate

active

09910293

ABSTRACT:
A disk drive controls head velocity during ramp load/unload by measuring voltages across a VCM and a sense resistor in series with the VCM, calculating a back EMF voltage using the VCM and sense resistor voltages, and adjusting the head velocity using the back EMF voltage. An embodiment includes amplifying the VCM and sense resistor voltages, multiplexing the amplified voltages, digitizing the multiplexed voltages and calculating the back EMF voltage in discrete-time based on the digitized voltages. Another embodiment includes selecting between PWM and IR cancellation techniques and calculating the back EMF voltage using the selected technique.

REFERENCES:
patent: 5469314 (1995-11-01), Morehouse et al.
patent: 5566369 (1996-10-01), Carobolante
patent: 5654840 (1997-08-01), Patton et al.
patent: 5838515 (1998-11-01), Mortazavi et al.
patent: 5963393 (1999-10-01), Rowan et al.
patent: 6016234 (2000-01-01), Blank et al.
patent: 6081112 (2000-06-01), Carobolante et al.
patent: 6140784 (2000-10-01), Mazda
patent: 6204629 (2001-03-01), Rote et al.
patent: 6396652 (2002-05-01), Kawachi et al.
patent: 6463211 (2002-10-01), Peritore et al.
patent: 6560057 (2003-05-01), Klaassen et al.
patent: 6631045 (2003-10-01), Pedrazzini
patent: 6643088 (2003-11-01), Kawachi
patent: 6867944 (2005-03-01), Ryan
patent: 2002/0196577 (2002-12-01), Harmer

Affiliated with

Also associated with

Rating

Method and apparatus for controlling head velocity in a disk... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for controlling head velocity in a disk..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for controlling head velocity in a disk... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3727213