Shape-Memory Effector With Integrated Position Sensing
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Solution Overview
Problem
Existing object-handling systems using actuators like solenoids often result in complex and bulky effectors, which can be inefficient and difficult to manage.
Innovation Solution
An effector system comprising an effector assembly with a conduit having conductive and resistive portions, shape-memory transducers, and a controller that selectively energizes these components to control the position and movement of an output member within the conduit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If traditional actuators like solenoids are used in effector assemblies, then object-handling operations can be mechanized, but the effector becomes complex and bulky
Solution Approach 1:
The patent combines multiple functions into the shape-memory alloy wire itself. The SMA wire serves as both the actuator (producing motion through phase transformation) and the position sensor (through integrated positional sensing). This merging eliminates the need for separate solenoid actuators and position sensors, directly reducing device complexity and bulk while maintaining automation capability
Solution Approach 2:
The patent replaces traditional mechanical solenoid actuators with shape-memory alloy-based actuators. The SMA actuator uses thermal-mechanical coupling (phase transformation) instead of electromagnetic fields, resulting in a more compact mechanism. This substitution also integrates positional sensing functionality, further reducing the overall system complexity
2Volume of moving object
If shape-memory transducers are used instead of solenoids, then effector size is reduced, but precise position control becomes more challenging
Solution Approach 1:
The patent implements integrated positional sensing that provides real-time feedback on the position of the output member within the conduit. This feedback mechanism allows the control system to precisely determine the position of the shape-memory actuator and make accurate adjustments, thereby achieving precise position control despite the compact size and inherent challenges of SMA actuation
Solution Approach 2:
The shape-memory alloy wire performs multiple functions simultaneously: it acts as the actuator to produce motion, as a structural element within the conduit, and as part of the positional sensing system. This multi-functionality allows precise position control in a compact configuration, as the same component provides both actuation and position information without requiring separate dedicated sensor elements
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 achieves efficient and precise control of object handling operations by utilizing shape-memory transducers and integrated positional sensing, resulting in a more compact and effective effector design.
Implementation Method 1
a first shape-memory transducer affixed between the proximal end and the output member; and a second shape-memory transducer affixed between the distal end and the output member
Implementation Method 2
an inner surface of the conduit having a conductive portion and a resistive portion
Data Source
AI summary
An effector system comprises: an effector assembly including: a first segment having a conduit between a proximal end and a distal end, an inner surface of the conduit having a conductive portion and a resistive portion; an output member slidable within the conduit, the output member having a conductive exterior contacting the inner surface; a first shape-memory transducer affixed between the proximal end and the output member; and a second shape-memory transducer affixed between the distal end and the output member; and a controller configured to: selectively energize: (i) the first shape-memory transducer to slide the output member in a first direction, (ii) the second shape-memory transducer to slide the output member in a second direction, or (iii) the resistive portion of the inner surface; and in response to energizing the resistive portion, determine a position of the output member.