Title:
EDDY CURRENT SURVE UNIT FOR CONTROLLING DISC PACK ROTATION
Document Type and Number:
Japanese Patent JPS5758270
Kind Code:
A
Abstract:
A servo system provides phase locked servo control of the rotational speed and phase of one, two, or more, disk packs by operating the disk pack, or packs, approximately 2% faster than desired, and then applying a control current to an existing eddy current brake in the disk pack via a servo circuit to reduce the speed to that desired. The servo circuit regulates the servo control current to the brake via two loops; a phase loop which establishes a pack position relative to an external reference pulse, and a velocity loop which provides compensation to enhance lock-up time and improve overall stability. The summed outputs of both loops provide a composite error signal corresponding to the servo control current.
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Inventors:
UIRAADO SHIII PIASAN
Application Number:
JP11858781A
Publication Date:
April 07, 1982
Filing Date:
July 30, 1981
Export Citation:
Assignee:
AMPEX
International Classes:
G11B19/28; H02P29/00; G05D13/62; (IPC1-7): G05D13/62; G11B19/28