Motors: expansible chamber type – Working member position feedback to motive fluid control – Electrical input and feedback signal means
Patent
1987-07-08
1988-12-13
Chambers, A. Michael
Motors: expansible chamber type
Working member position feedback to motive fluid control
Electrical input and feedback signal means
91459, 13762564, 13762565, 364510, 36416701, F15B 1316
Patent
active
047902337
ABSTRACT:
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.
REFERENCES:
patent: 3760591 (1973-09-01), Gordon
patent: 4351152 (1982-09-01), Reynolds et al.
patent: 4537364 (1985-08-01), Pollman et al.
patent: 4574686 (1986-03-01), Budzich
patent: 4628499 (1986-12-01), Hammett
Backe Bengt S.
Durham La Moyne W.
Chambers A. Michael
Dodd Thomas J.
South Bend Lathe, Inc.
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