Velocity controlled disk drive head retraction after power loss

Details Velocity controlled disk drive head retraction after power loss Velocity controlled disk drive head retraction after power loss

2006-12-05

2006-12-05

Wong, K. (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

Reexamination Certificate

active

07145742

ABSTRACT:
A control apparatus controls retraction of a device carried on a moveable member actuated by an electric motor after a sudden power loss. The control apparatus includes a measuring circuit for measuring a back electromotive force (back EMF) from the electric motor during a measuring phase. The control apparatus also includes a controller which receives the actual velocity and provides a command signal for controlling a magnitude of the drive current based on a commanded velocity and the actual velocity of the moveable member. The control apparatus further comprises a current control loop for providing a command current signal based on the current provided to the electric motor and the command signal, and for providing the electric motor with the drive current during a driving phase based on the command current signal.

REFERENCES:
patent: 3626264 (1971-12-01), Halfhill et al.
patent: 5982130 (1999-11-01), Male
patent: 6040671 (2000-03-01), Brito et al.
patent: 6072666 (2000-06-01), Sonderegger et al.
patent: 6108157 (2000-08-01), Yoneda et al.
patent: 6140784 (2000-10-01), Mazda
patent: 6204629 (2001-03-01), Rote et al.
patent: 6282049 (2001-08-01), Cameron et al.
patent: 6301082 (2001-10-01), Sonderegger et al.
patent: 6324033 (2001-11-01), Broom et al.
patent: 6373650 (2002-04-01), Pedrazzini
patent: 6396652 (2002-05-01), Kawachi et al.
patent: 6512650 (2003-01-01), Tanner
patent: 6594102 (2003-07-01), Kanda et al.
patent: 6667843 (2003-12-01), Norman et al.
patent: 6700034 (2004-03-01), Lindsay et al.
patent: 6721119 (2004-04-01), Hassan et al.
patent: 6765746 (2004-07-01), Kusumoto
patent: 2001/0019463 (2001-09-01), Drouin

Affiliated with

Also associated with

Rating

Velocity controlled disk drive head retraction after power loss does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Velocity controlled disk drive head retraction after power loss, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Velocity controlled disk drive head retraction after power loss will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3673401