Electricity: motive power systems – Positional servo systems – With compensating features
Reexamination Certificate
2000-02-24
2001-06-12
Nappi, Robert E. (Department: 3746)
Electricity: motive power systems
Positional servo systems
With compensating features
C318S560000, C318S568100, C318S578000, C318S605000, C318S652000, C318S799000
Reexamination Certificate
active
06246201
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates generally to positioning mechanisms, and more specifically to electronically controlled cam servo control systems.
At least one known electronic servo system includes a plurality of installed modules, typically referred to as input/output (I/O) modules. In one application, an I/O module functions as a digital servo control module to perform precise, complex motion coordinated between two axes similar to a mechanical cam.
A control system with a velocity and torque/current feed forward compensation is used to control speed and dynamic accuracy of motion. However, these systems are complex and require large amounts of data storage.
Accordingly, it would be desirable to provide a less complex electronic cam servo control system which delivers performance comparable to existing systems, is simpler for a user to operate, and requires less data storage space.
BRIEF SUMMARY OF THE INVENTION
In an exemplary embodiment, an electronic cam servo control system includes a processor, a digital servo control module capable of performing motion equivalent to a mechanical cam, an encoder, and a control program. A method for delivering high accuracy cam servo motion and simplifying cam motion applications in an electronic system includes importing a cam position profile and acquiring cam shaft position and velocity from an encoder interface. A cam servo position command is calculated using a cam position profile table. In addition, first derivatives of the cam position profile are calculated. Cam shaft position and cam shaft velocity are acquired which allows a cam servo velocity compensation command to be calculated by multiplying the first derivative of the cam position profile by the cam shaft velocity. A cam position command and a cam velocity compensation command are then sent to the control module for execution.
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patent: 4810941 (1989-03-01), Ohishi et al.
patent: 5598304 (1997-01-01), Choi et al.
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Aderek Andrzej
De Anirban
Tuso Michael Joseph
Armstrong Teasdale LLP
GE Fanuc Automation North America Inc.
Horton, Esq. Carl
Leykin Rita
Nappi Robert E.
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