Final servo control in NC systems
Patent 4041287 Issued on August 9, 1977. Estimated Expiration Date: 
August 9, 1994. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 9, 1994. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3656124 3727191 Method and apparatus for numerical control Patent #: 3941987 InventorsAssigneeApplicationNo. 05/721404 filed on 09/08/1976US Classes:318/569, Digital or numerical systems700/188, Including velocity or acceleration control700/189, Interpolation700/193, Positional compensation or modification compensation or mod901/9Closed loop (sensor feedback controls arm movement)ExaminersPrimary: Botz, Eugene G.Attorney, Agent or FirmAbstractAn improved final servo control for numerical control systems of the type which perform linear and/or circular interpolation by iterative updating of commanded position signals. The improvements are embodied in means to sense when the servo loop has had an offset error introduced by drift or aging of the final amplifier or similar components, together with means for progressively and automatically removing such error; and by means to avoid attempts at extreme acceleration or deceleration beyond the ability of the servo power element (motor) to accomplish, --by creating from an iteratively updated primary position command signal, whose rate of change may suddenly alter by a wide margin, a secondary position command signal which varies ultimately by the same amount but at a lesser rate of change. | |
