Adaptive Actuator Control Reducing Torque Ripple
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Solution Overview
Problem
Existing electric actuators face challenges in reducing noise and vibration due to electromagnetic forces and torque ripple, which excite resonance frequencies and propagate as 'jitter' in precision motion control applications, limiting their acoustic quieting and vibration reduction capabilities.
Innovation Solution
An adaptive motor control system employing closed-loop control techniques with vibration feedback from sensors to modify the current command in motor drive electronics, utilizing adaptive torque ripple cancellation algorithms and active damping to minimize motor torque ripple and structural resonance, thereby reducing noise and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If electromagnetic forces and torque ripple are reduced through motor design modifications, then noise and vibration are reduced, but device complexity increases
Solution Approach 1:
The patent implements feedback control by using vibration sensors to detect structural resonance and feeding this information back to the controller, which then adjusts motor commands to cancel the resonance. This closed-loop feedback mechanism reduces noise and vibration without requiring complex physical modifications to the motor structure.
Solution Approach 2:
The patent introduces an intermediary control system that acts between the motor and the structure. The controller generates counteracting commands based on sensor feedback, serving as a mediator that eliminates the need for direct physical modifications to the motor or structure, thereby reducing complexity compared to hardware-based solutions.
2Object-affected harmful factors
If vibration feedback control is implemented to reduce structural resonance, then noise propagation is reduced, but device complexity increases
Solution Approach 1:
Vibration feedback control is implemented by mounting sensors on the actuator structure to detect resonance vibrations. The controller processes this feedback signal and generates counteracting motor commands to cancel the resonance, thereby reducing noise propagation through the structure without requiring complex physical dampening elements.
Solution Approach 2:
The patent replaces mechanical vibration dampening systems with an electronic control-based solution. Instead of using physical dampers, isolators, or structural modifications, the system uses electronic sensors and controllers to actively cancel vibrations, reducing the need for complex mechanical components.
3Object-generated harmful factors
If adaptive torque ripple cancellation is applied to minimize motor torque ripple, then vibration at the source is reduced, but device complexity increases
Solution Approach 1:
Adaptive torque ripple cancellation uses feedback from vibration sensors to detect torque ripple effects on the structure. The controller processes this feedback and generates compensating current commands to cancel the torque ripple, reducing vibration at the source without requiring complex physical modifications to the motor components.
Solution Approach 2:
The system implements dynamic torque ripple cancellation by continuously adapting the compensation commands based on real-time operating conditions and measured vibrations. This dynamic approach allows the system to maintain effectiveness across varying operating points without requiring complex hardware for each specific condition.
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 system effectively reduces noise and vibration in electric actuators by accurately modeling the system dynamics and applying noise reduction and active cancellation methods, achieving desired output torque with minimized noise propagation.
Implementation Method 1
using closed loop control techniques using vibration feedback from an EMA mounted sensor to modify the current command in the motor drive electronics to minimize the resultant motor torque ripple
Implementation Method 2
electromagnetic forces induced in brushless DC motors affect the actuator structure and can excite resonance frequencies within the unit
Implementation Method 3
An active damping feedback control loop (615) is configured to produce a damping signal (618) as a function of said measured response (y2)
Data Source
AI summary
A system and method for acoustic quieting and reduction of vibration of an electromechanical actuator (“EMA”) accomplished by using closed loop control techniques using vibration feedback from an EMA mounted sensor to modify the current command in the motor drive electronics to minimize the resultant motor torque ripple.