Electromechanical Actuator Decoupling Mechanism for Manual Override
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Solution Overview
Problem
Current electric rotary actuator driven mechanisms lack an integral decoupling system, making it impossible to return to a stowed position during a power outage, as they cannot be back-driven without power restoration.
Innovation Solution
A drive system comprising an electromechanical rotary actuator with a toggle arm and pin mechanism that allows disengagement from the electric motor rotary actuator during a power loss, enabling manual override and repositioning, and automatic re-engagement upon power restoration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigid linkage system is used in an electric rotary actuator, then the mechanism can be driven reliably during normal operation, but the mechanism cannot be back-driven manually during a power outage
Solution Approach 1:
The linkage system transitions from a rigid fixed state during normal operation to a decoupled movable state during power outage. The pin can shift between an engaged position (coupling first and second links) and a disengaged position (decoupling the links), allowing the system to adapt its mechanical properties based on operational conditions.
Solution Approach 2:
The pin acts as an intermediary element between the first link and second link. It can be positioned to either connect or disconnect the linkage path, serving as a mechanical switch that controls whether manual back-driving is possible while maintaining reliable powered operation when engaged.
2Adaptability or versatility
If an integral decoupling system is added to allow manual override, then the mechanism can be repositioned during power loss, but the device complexity increases
Solution Approach 1:
The decoupling function is segmented into discrete components: the pin, toggle arm, and spring. Each component has a specific function - the pin provides the decoupling action, the toggle arm provides mechanical leverage, and the spring provides the biasing force. This segmentation allows for a relatively simple implementation compared to more complex decoupling systems.
Solution Approach 2:
The spring-biased toggle arm mechanism automatically returns the pin to the engaged position when manual force is released, restoring the coupled linkage state without requiring additional actuators or complex control systems. The system self-regulates between engaged and disengaged states based on the presence or absence of manual override force.
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
Enables manual override and repositioning of mechanisms during power outages and automatic restoration of normal operation when power is reinstated, enhancing operational flexibility and efficiency.
Implementation Method 1
A second arm position may disconnect the second link and the third link from the first link. The toggle arm may be biased to the first arm position by a spring.
Data Source
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AI summary
In various embodiments, a drive system with a motor rotary actuator driven linkage and an override system is provided. The override system may be a manually actuated override system that, in response to a power loss or outage, is configured to disengage one or more links of drive system 100 from the electric motor rotary actuator, allowing the disengaged link to be moved and/or repositioned. Moreover, drive system 100 and, more specifically, the override system may be configured to restore normal operation to the disengaged link in response to power being restored (i.e., by reengaging the link).