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US 4,706,456 AGranted
Method and apparatus for controlling hydraulic systems
AssigneeSouth Bend Lathe, Inc.
InventorsBengt S. Backe, La Moyne W. Durham
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AssigneeSouth Bend Lathe, Inc.
InventorsBengt S. Backe, La Moyne W. Durham
Estimating the term…
A control system is provided for a hydraulic actuating system having a multi-phase stepping motor with a driver therefor which supplies and controls DC current through each of the motor windings such that no current is induced into the control winding from adjacent windings. The stepping motor precisely controls the rotation of an eccentric cam engaging an actuating plunger which actuates a control valve of the hydraulic actuating system. The driver receives control signals from a computer programmed to calculate, from user input command signals indicative of the desired system condition, and generate those control signals which most quickly achieve a rough approximation of the desired system condition. After this rough approximation is attained, the computer generates new control signals for the driver as a function of feedback signals and/or system component characteristics so as to precisely achieve the desired system condition.
A precision driver for a multi-phase stepping motor having a plurality of windings comprising:
A control system for hydraulic actuating systems having hydraulic pressure supply and pressure return, at least one control line for applying actuating hydraulic pressure to at least one movable element, and valve means connected between said pressure supply and said control line, for controlling pressure flow therebetween, comprising:
A precision driver for a multi-phase stepping motor having a plurality of windings, comprising:
Dependencies are inferred from the claim text.