Linear Actuator Rod Correction Plate for Magnet Flexure
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Solution Overview
Problem
Conventional linear actuator units using rod-type linear motors face issues with magnet rod flexure due to uneven magnetic suction force distribution, which can hinder motion and reduce positioning accuracy.
Innovation Solution
Incorporating a rod correction plate made of a magnetic body that protrudes from the slide member to close the guide shaft's opening portion, reducing flexure by distributing magnetic suction force evenly and enhancing positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the magnet rod is arranged in the hollow portion of the guide shaft, then the linear actuator unit achieves compact integration, but uneven magnetic suction force causes flexure in the magnet rod
Solution Approach 1:
A rod correction plate made of magnetic material is introduced as an intermediary component between the magnet rod and the guide shaft opening. This plate distributes the magnetic suction force evenly across the magnet rod's surface, preventing flexure while maintaining the compact integrated structure. The correction plate acts as a mediator that transfers and equalizes the magnetic forces.
Solution Approach 2:
The rod correction plate is positioned specifically at the location where magnetic suction force is uneven (near the opening portion of the guide shaft). By applying magnetic material locally at this critical position, the invention addresses the uneven force distribution without requiring changes to the entire structure, thus maintaining compactness while improving stability.
2Ease of operation
If the opening portion is formed in the guide shaft for joining the forcer, then the forcer can be connected to the slide member, but magnetic suction force does not act at the opening portion causing flexure on the opposite side
Solution Approach 1:
The rod correction plate serves as a magnetic intermediary that extends into the opening portion region. It compensates for the missing magnetic suction force at the opening by providing an additional magnetic component that distributes force evenly, allowing the opening to remain functional while preventing opposite-side flexure.
3Stability of the object's composition
If the magnet rod flexure increases, then the forcer and magnet rod may contact each other, but this contact can hinder motion and reduce positioning accuracy
Solution Approach 1:
The rod correction plate prevents magnet rod flexure by distributing magnetic forces evenly, thereby maintaining the gap between the forcer and magnet rod. This ensures smooth relative motion and preserves positioning accuracy without requiring additional clearance or compensation mechanisms.
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 solution effectively reduces magnet rod flexure and ensures smooth motion and high positioning accuracy of the slide member while maintaining a compact design.
Implementation Method 1
magnetic suction force acts between the magnet rod and an inner wall of the guide shaft
Implementation Method 2
when drive currents are passed through the coil members, propulsion force is generated for the forcer along an axial direction of the magnet rod
Data Source
AI summary
Provided is a linear actuator unit that includes: a guide shaft formed of a magnetic body that is formed into a tubular shape while having a hollow portion therein, and has one linear opening portion formed thereon along an axial direction thereof; a slide member capable of reciprocating motion freely along the guide shaft; a magnet rod supported at both ends thereof in the hollow portion of the guide shaft; a forcer arranged on a periphery of the magnet rod in the hollow portion of the guide shaft, constitutes a linear motor together with the magnet rod, and is joined to the slide member while interposing the opening portion of the guide shaft therebetween; and a rod correction plate that is formed of a magnetic body, and juts out from the slide member forward and backward in a movement direction thereof so as to close the opening portion of the guide shaft.