Motion control system
Servo system for track accessing and track following in a disk drive
Sampled data servo positioning system
Servo system for data storage apparatus Patent #: 4400747
ApplicationNo. 06/414285 filed on 08/16/1982
US Classes:360/78.04, For rotary carrier (e.g., disc)318/571, With "feed-rate" control360/78.06, Specified velocity pattern during access360/78.09Including model of servo system or element
ExaminersPrimary: Kilgore, Robert M.
Attorney, Agent or Firm
International ClassesG11B 21/08 (20060101)
G11B 5/55 (20060101)
AbstractA sector servo seek control samples each sector to obtain sector time, the track identification within a sequence of track types and a position error signal for a track location to track location seek. The device during each sector determines the actual transducer track location and the next sector projected track location with respect to the sequence of track types. The projected track location is corrected using the error signal to find the actual location, but if a sector signal is missing or erroneous, the projected location is used as the actual location, permitting a composite correction to be made when a correct sector signal is obtained. The seek time is minimized by using maximum acceleration followed by maximum deceleration while not exceeding a velocity value that would cause the device to overshoot the target track using full deceleration.