Electricity: motive power systems – Positional servo systems – Multiple mode systems
Patent
1990-01-30
1990-10-23
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
Multiple mode systems
318561, 318632, 360 7703, 360 7807, G05B 1300
Patent
active
049655019
ABSTRACT:
A servo circuit having a speed detection circuit for detecting a real speed from a position signal from an object under servo control; a speed error detection circuit for generating a speed error signal between a target speed and the real speed; a position error detection circuit for generating a position error signal from the position signal; a switching unit for switching connection of the servo object to the speed error detection circuit or the position error detection circuit and supplying a control current to the servo object; a control current detection circuit for detecting said control current and generating a current sensing signal; and a main processing unit for controlling the switching of the switching unit and controlling the operation of the overall servo circuit, near the target seek position, wherein provision is made of: (a) a gain setting signal preparing unit which prepares gain setting signals which set detection gains; (b) said main processing unit which supplies a target speed gain setting signal prepared by the gain setting signal preparing unit and reference target speed to the speed error detection circuit and supplies the gain setting signals of the velocity and current sensing signals to the speed detection circuit; and (c) a speed detection gain adjustment unit which preforms control to vary the detection gains of the velocity and current sensing signals in the speed detection circuit in accordance with the gain setting signals of the velocity and current sensing signals.
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patent: 4887173 (1989-12-01), Sengoku et al.
Fujitsu Limited
Ip Paul
Shoop Jr. William M.
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