Single-Guide Electric Actuator for Alignment and Side Load Stability
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Solution Overview
Problem
Conventional test machines with multiple guide paths for linear movement often experience misalignment due to thermal expansion, wear, and shipment, leading to operational difficulties and reduced side load capacity.
Innovation Solution
An electric actuator design utilizing a single stationary guide rod with interacting magnetic fields and compliant flexures to maintain linear movement, reducing overconstraint and ensuring parallelism, along with a secondary force generating device to manage continuous forces and prevent overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If multiple guide paths are used for linear movement, then the actuator can provide structural support, but misalignment occurs due to thermal expansion, wear, and shipment
Solution Approach 1:
The patent merges multiple guide paths into a single guide rod that provides both structural support and precise alignment. The single guide rod eliminates misalignment issues between multiple guides while maintaining the necessary structural integrity through its design and integration with the actuator frame.
Solution Approach 2:
The single guide rod serves multiple functions simultaneously: it provides structural support for the actuator, ensures precise linear movement alignment, and acts as a reference for the magnetic field interaction. This multi-functionality resolves the contradiction by consolidating support and alignment functions into one component.
2Strength
If multiple guide paths are used, then structural support is provided, but side load capacity is reduced due to overconstraint
Solution Approach 1:
By merging multiple guide paths into a single guide rod, the patent eliminates overconstraint that limits side load capacity. The single guide rod design allows the moving assembly to accommodate lateral forces without the restrictive effects of multiple constrained paths, thereby improving ease of operation under side loads.
Solution Approach 2:
The patent introduces dynamic compliance through flexures that allow the moving assembly to adapt to lateral forces. This dynamic response enables the system to handle side loads effectively while maintaining structural support, resolving the contradiction between strength and operational ease.
3Manufacturing precision
If magnetic fields are used for linear movement, then precision is improved, but overheating may occur due to continuous force generation
Solution Approach 1:
The patent employs periodic pulsed magnetic fields instead of continuous force generation. The controller applies magnetic forces in pulses that are sufficient to move the moving assembly to the desired position, then allows the fields to be reduced or turned off. This periodic action maintains precision while significantly reducing heat generation from continuous magnetic field operation.
Solution Approach 2:
The patent replaces continuous mechanical force generation with a controlled magnetic field system that uses minimal energy. The magnetic fields provide precise positioning without the continuous mechanical stress and heat generation associated with traditional mechanical actuators, resolving the overheating issue while maintaining precision.
4Manufacturing precision
If a single guide rod is used, then alignment is maintained, but side loads may cause bending
Solution Approach 1:
The patent changes the mechanical parameters of the guide rod by introducing flexures with specific compliance characteristics. These flexures are designed to be compliant in directions that accommodate side loads and bending, while maintaining stiffness in the axial direction to preserve alignment. This parameter optimization resolves the contradiction between alignment maintenance and bending resistance.
Solution Approach 2:
The patent uses flexible elements (flexures) that can bend to accommodate side loads while maintaining the overall alignment of the guide rod system. These flexible components allow controlled deformation under lateral forces without compromising the precision of the linear movement, resolving the contradiction between alignment and bending resistance.
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 electric actuator achieves stable linear displacement with improved side load capacity and reduced risk of overheating, maintaining optimal performance across various applications.
Implementation Method 1
the moving assembly and the stationary assembly provide at least two sets of interacting magnetic fields disposed about the guide at equal angular intervals
Implementation Method 2
a flexure joining the bearing surface to the bearing support, the flexure being compliant for moments about axes orthogonal to the guide and stiff for forces along the axes orthogonal to the guide
Data Source
AI summary
An electric actuator includes a stationary support and a guide system having a single stationary guide joined to the stationary support having an axis. The actuator also includes a stationary assembly secured to the stationary support. A moving assembly is movable relative to the stationary support on the guide, where the moving assembly and the stationary assembly provide at least two sets of interacting magnetic fields disposed about the guide at equal angular intervals. A test specimen support is joined to the moving assembly and disposed on one side of the stationary support so as to move along the axis with movement of the moving assembly, the axis extending through the test specimen support.