Electromechanical Actuator Stroke Compensation
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Solution Overview
Problem
Electromechanical actuators with dual systems face reliability issues when one system fails, as the other system becomes immobile, preventing the achievement of both minimum and maximum stroke lengths, thus degrading overall apparatus reliability.
Innovation Solution
The actuator is designed with movable elements that can adjust stroke length by moving along a common rod, allowing each system to operate independently to ensure full stroke width, including minimum and maximum lengths, by moving elements away from or towards each other's reference positions, even if one system fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dual system configuration is adopted to improve reliability, then failsafe capability is improved, but when one system fails the other system becomes immobile preventing full stroke operation
Solution Approach 1:
The movable element is designed to dynamically change its position along the rod, transitioning between a first position (when both systems operate) and a second position (when one system fails). This dynamic repositioning allows the operational system to compensate for the failed system and maintain full stroke capability, resolving the contradiction between reliability improvement and operational capability.
2Length of moving object
If the second rod is moved away from the first rod to increase stroke length, then maximum stroke length is achieved, but the second rod becomes disabled from movement
Solution Approach 1:
The movable element is pre-configured to be movable along the rod before failure occurs. This preliminary mobility arrangement ensures that when one system fails, the operational system can immediately reposition the movable element to compensate for the failed system's immobility, maintaining both maximum stroke length and movement capability without requiring complex real-time adjustments.
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
This configuration ensures that the electromechanical actuator maintains required stroke lengths and reliability by allowing the operational system to adjust and compensate for failures, preventing degradation of the apparatus' performance.
Implementation Method 1
a first movable element capable of being moved back and forth in an axial direction of a rod by rotational driving force of a first motor
Data Source
AI summary
An electromechanical actuator includes a first system and a second system. The first system includes a first motor and a first movable element capable of being moved back and forth in an axial direction of a rod. The second system includes a second motor and a second movable element capable of being moved back and forth in the axial direction of the rod. The electromechanical actuator is capable of adjusting a stroke length which is a distance between the first driving section set to or in the proximity of an end portion of the first movable element and the second driving section set to or in the proximity of an end portion of the second movable element. The first movable element and second movable element are configured for back and forth movement in the axial direction of the common rod.