Motor servo-drive for high performance motion control
AssigneeACS Motion Control Ltd.
InventorsZe'ev KIRSHENBOIM, Boaz KRAMER, Vladimir KOGAN
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Abstract
A servo-drive system for feedback-based control of motion and positioning of a motor comprises a current measurement device that obtains a measure of current being drawn by the drive motor from which to provide feedback. The current has an operating range which is made up of a relatively large current range for acceleration but remains within a relatively smaller current range for steady state operating of the motor. The current measurement device has a first, coarse, sensor optimized for measuring the relatively large current range and a second, fine, sensor optimized for measuring the relatively smaller current range, thereby to maximize feedback accuracy during steady state operation.
Claims25
A servo-drive system for feedback-based control of motion and positioning of a motor, comprising:
- a current measurement device configured to obtain a measure of current being drawn by said drive motor, therefrom to provide said feedback;
- the current having an operating range, the operating range comprising a relatively large current range for acceleration but remaining within a relatively smaller current range for steady state operating of said motor, said current measurement device having a first, coarse, sensor optimized for measuring said relatively large current range and a second, fine, sensor optimized for measuring said relatively smaller current range, thereby to maximize accuracy for said feedback during said steady state operation.
A method for current control of a servo-drive for feedback-based control of motion and positioning of a motor, comprising:
- obtaining a measure of current into said motor;
- providing said measure to provide said feedback, the current having an operating range, the operating range comprising a relatively large current range for acceleration but remaining within a relatively smaller current range for steady state operating of said motor, said obtaining said current measure comprising taking a first, coarse, measure of said relatively large current range and a second, fine, measure of said relatively smaller current range, thereby to maximize measurement accuracy during said steady state.
A servo-drive for feedback-based control of motion and positioning of a motor, comprising:
- a coarse command input for receiving an externally generated command signal as a coarse command;
- an amplifier for amplifying said externally generated command signal;
- a fine command signal output of said amplifier for receiving said externally generated command after amplification as a fine command signal;
- the command having an operating range, the operating range comprising a relatively large range for transition states but remaining within a relatively smaller range for steady state operating of said motor, said servo drive comprising a switch for connecting said coarse command when said command is above a predetermined threshold and connecting said fine command when said command is below said predetermined threshold, thereby to maximize accuracy for said command during said steady state operation.
An actuator system with feedback-based control of motion and positioning, comprising:
- a measurement device configured to obtain a measure of a controllable feature of said actuator, therefrom to provide said feedback;
- the feature being a measurable feature having an operating range, the operating range comprising a relatively large range for transition states but remaining within a relatively smaller range for steady state operating of said actuator, said measurement device having a first, coarse, sensor optimized for measuring said relatively large range and a second, fine, sensor optimized for measuring said relatively smaller steady state range, thereby to maximize accuracy for said measurable feature during said steady state operation.
Dependencies are inferred from the claim text.