Actuation Assembly Torque Control via Integrated Calibration Curves
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Solution Overview
Problem
Existing actuation systems face inaccuracies due to imprecise electromagnetic constants of motors and current controllers, leading to uncertainties in output torque control, particularly in applications requiring high accuracy.
Innovation Solution
A method for controlling an electric actuation assembly that involves applying known forces to record input intensities, establishing characteristic functions through interpolation, and calculating a control correction coefficient to compensate for uncertainties, allowing for accurate torque control without separate calibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the electromagnetic constant of the motor is used to determine the setpoint current, then the control process is simple, but the torque control accuracy deteriorates due to inaccuracies in the electromagnetic constant
Solution Approach 1:
The patent applies preliminary action by performing calibration measurements before actual operation. The system pre-determines correction coefficients by measuring the actual relationship between current and torque output, then uses these pre-calculated coefficients to compensate for inaccuracies during normal operation, thereby achieving high torque control accuracy without complex real-time calculations
Solution Approach 2:
The patent implements feedback by using the measured actual torque characteristics to generate correction coefficients that feed back into the control system. This feedback mechanism allows the system to compensate for inaccuracies in the electromagnetic constant and current controller, transforming the open-loop control into a compensated system that achieves high precision torque control
2Measurement precision
If separate calibrations of motor, gearbox and current controller are performed, then individual component accuracy is improved, but the calibration time and complexity increase
Solution Approach 1:
The patent merges the calibration processes of the motor, gearbox, and current controller into a single integrated calibration procedure. Instead of calibrating each component separately, the system performs one comprehensive calibration that determines the overall transfer function from current input to torque output, thereby achieving complete system calibration in a single operation that reduces both time and complexity
Solution Approach 2:
The patent creates a universal calibration approach that simultaneously addresses the calibration needs of multiple components (motor, gearbox, current controller) through a single procedure. The correction coefficients generated serve multiple purposes: compensating for electromagnetic constant inaccuracies, current controller variations, and gearbox characteristics, making the calibration process multi-functional and highly efficient
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method enhances torque control accuracy by compensating for motor and controller inaccuracies, reducing the need for individual calibrations and improving system precision.
Implementation Method 1
a motor (11) coupled with a gearbox (12), the rotary output (13) of which actuates the hinge (2)... the current controller (2a) applies a current with an intensity equal to the intensity setpoint to the motor (11) which generates a motor torque
Data Source
AI summary
A method for controlling an electric actuation assembly with improved accuracy in controlling the torque or force generated. The method includes applying a plurality of known first output forces and recording a plurality of first input intensities for a first movement direction of the output; establishing, by interpolation, a first characteristic function; applying a plurality of second known output torques and recording a plurality of second input currents for a second movement direction of the output opposite to the first direction; establishing, by interpolation, a second characteristic function; establishing, on the basis of the first characteristic function, the second characteristic function, a magnetic constant of the motor and a reduction ratio of a gearbox, and a control correction coefficient; and controlling the actuation assembly by applying the control correction coefficient.