Pre-Twisted Wire Actuator for Stable Long-Stroke Motion
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Solution Overview
Problem
Existing twisted string actuators experience over-twisting when increasing the number of rotations, leading to unstable stroke and torque fluctuations, preventing effective control.
Innovation Solution
The actuator design fixes wires in a pre-twisted state with the same twist rotation direction, allowing them to be rotated and twisted together to achieve a larger stroke without over-twisting, with ultra-high molecular weight polyethylene or stranded wires enhancing strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the number of rotations of twisting wires is increased to increase the amount of stroke, then the stroke increases, but over-twisting occurs causing unstable torque and control
Solution Approach 1:
The wires are pre-twisted in the same rotation direction before being fixed to the support member. This preliminary twisting action creates initial tension and geometric configuration that prevents over-twisting during operation, allowing the actuator to achieve larger stroke while maintaining stable torque and control
2Length of moving object
If wires are twisted together to reduce distance between support member and load, then stroke is achieved, but over-twisting causes fluctuations in torque
Solution Approach 1:
The wires are pre-twisted in the same rotation direction before being fixed to the support member. This preliminary twisting action creates initial tension and geometric configuration that prevents over-twisting during operation, allowing the actuator to achieve larger stroke while maintaining stable torque and control
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 enables a larger stroke with stable torque and reduced over-twisting, improving mechanical efficiency and control stability.
Implementation Method 1
a drive source configured to rotate the support member, to thereby twist the plurality of wires together
Data Source
AI summary
An actuator includes: a plurality of wires, one end of each wire of the plurality of wires being engaged with a load; a support member, another end of each wire of the plurality of wires being fixed to the support member; and a drive source configured to rotate the support member, to thereby twist the plurality of wires together, the actuator being configured to change a distance between the support member and the load in accordance with the rotation of the support member. Each of the plurality of wires is fixed to the support member in a state in which the plurality of wires are twisted in advance in the same twist rotation direction, and when the distance between the support member and the load is reduced, the plurality of wires are rotated in a rotation direction the same as the twist rotation direction and then twisted together.