Linear Actuator Center Alignment for Precision and Durability
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Solution Overview
Problem
Magnetically driven linear actuators face challenges in achieving high precision and durability due to unreasonable stress on the linear guide and resistance to sliding, which affects responsiveness and positioning accuracy.
Innovation Solution
The design includes a tubular movable element with a driving coil and a linear guide aligned with the central axis, a load attaching member, and a position detecting mechanism using a light-emitting and light-receiving pair, where the center of gravity and thrust force are matched, reducing momentum and stress on the linear guide, and a closed magnetic circuit for consistent thrust force, along with elastic members for cushioning and efficient cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the linear actuator uses a conventional structure without matched centers, then the structure is simpler, but the positioning precision and responsiveness deteriorate due to unreasonable stress and sliding resistance on the linear guide
Solution Approach 1:
The patent applies asymmetry by strategically positioning the linear guide, load attaching member, and position detecting mechanism along the central axial line to create an asymmetric distribution that balances forces. The center of gravity of the movable element is specifically matched with the center of the linear guide and the center of thrust force, creating a symmetric force distribution that eliminates unreasonable stress and sliding resistance, thereby improving positioning precision without excessive structural complexity.
Solution Approach 2:
The patent achieves equipotentiality by matching the center of gravity of the movable element with the center of the linear guide and the center of thrust force. This alignment creates a balanced force distribution where gravitational force and thrust force act through the same point, eliminating rotational moments and unreasonable stress on the linear guide, thus reducing sliding resistance and improving positioning precision.
2Speed
If the linear actuator operates with high responsiveness, then the positioning speed is faster, but the durability deteriorates due to increased stress on the linear guide
Solution Approach 1:
The patent applies equipotentiality by aligning the center of gravity, center of linear guide, and center of thrust force. This alignment ensures that during high-speed operation, the gravitational and thrust forces act through the same point, eliminating rotational moments and unreasonable stress on the linear guide. This allows the actuator to operate at high speeds with improved responsiveness while maintaining durability by preventing excessive stress accumulation.
Solution Approach 2:
The patent changes the spatial parameters of the linear guide, load attaching member, and position detecting mechanism by positioning them along the central axial line and matching their centers with the center of gravity. This parameter optimization allows the system to achieve high responsiveness through fast movement while maintaining durability by distributing stress evenly and eliminating unreasonable load concentrations on the linear guide.
3Ease of operation
If the linear actuator uses a conventional arrangement without aligned centers, then the device complexity is lower, but the sliding resistance increases reducing responsiveness
Solution Approach 1:
The patent uses asymmetry by positioning the linear guide, load attaching member, and position detecting mechanism in a specific asymmetric arrangement along the central axial line. This arrangement is optimized to align the center of gravity with the center of the linear guide and thrust force, creating a balanced force distribution that minimizes sliding resistance and maximizes responsiveness, achieving ease of operation without excessive arrangement complexity.
Solution Approach 2:
The patent achieves equipotentiality by matching the center of gravity of the movable element with the center of the linear guide and the center of thrust force. This alignment creates a balanced force distribution where gravitational and thrust forces act through the same point, eliminating rotational moments and unreasonable stress on the linear guide, thus reducing sliding resistance and improving responsiveness without complex arrangements.
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 enhances the responsiveness and precision of the linear actuator's movement while improving durability by minimizing stress on the linear guide and reducing sliding resistance, allowing for high-precision positioning and extended lifespan.
Implementation Method 1
a driving coil 12 wound around an outer peripheral surface of a tubular coil frame 11 in a peripheral direction, and an anchoring element that is provided with a magnet disposed opposite the driving coil across a fixed gap, wherein an excitation current of the driving coil is controlled, whereby the movable element is moved in linear fashion
Data Source
AI summary
In a linear actuator (1), on the inside of a rectangular tubular movable element (3), a linear guide (14) that supports the movable element (3) so as to be linearly movable is positioned at a center of the movable element (3), and a position detecting mechanism (20) and load attaching member (13) that sandwich the linear guide are disposed linearly in a vertical direction. This arrangement enables a center of gravity of the movable element (3) to be matched with a center of the linear guide (14). A magnetic circuit is in a bilaterally symmetrical relationship with regard to the center of the movable element (3). Therefore, a center of a thrust force that acts upon the movable element (3) is matched with the center of the movable element (3). The center of the thrust force that acts upon the movable element (3), the center of gravity of the movable element (3), and the center of the linear guide (14) are positioned at the center of the movable element (3). Resistance to sliding in the movable element (3) can be reduced without unreasonable stress being placing on the linear guide (14). Therefore, a magnetically driven linear actuator that has highly precise positioning and that is durable can be realized.