Linear Motor Magnetic Shielding L-Plate Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional linear motor devices face challenges in effectively shielding electrical components on the moving element from the magnetic field of permanent magnets, leading to malfunctioning or reduced accuracy, and strong magnetic attraction from shielding plates impedes smooth movement.
Innovation Solution
A linear motor device with a magnetic shielding member comprising a parallel shielding plate and perpendicular shielding plates positioned between the magnetic shielding target objects and permanent magnets, which reduces magnetic field influence on electrical components while minimizing magnetic attraction by extending the perpendicular plates away from the magnets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple small shielding plate is provided between the permanent magnets and the sensor device, then the device complexity is reduced, but the magnetic shielding effect is insufficient and the sensor device is still influenced by the magnetic field
Solution Approach 1:
The invention transitions from a simple two-dimensional shielding plate to a three-dimensional L-shaped shielding structure that extends in multiple directions. The first shielding plate is positioned between the permanent magnet and sensor device, while the second shielding plate extends perpendicular to the movement direction, creating a multi-dimensional barrier that effectively blocks magnetic field lines from reaching the sensor device.
Solution Approach 2:
The L-shaped shielding structure can be viewed as a nested configuration where the second shielding plate extends from the first shielding plate, creating a layered protective structure. This nested arrangement allows the shielding member to block magnetic field lines approaching from different directions while maintaining a compact form factor.
2Reliability
If the surface area of the shielding plate is increased to improve magnetic shielding effect, then the magnetic shielding effect is enhanced, but the magnetic attraction force from the permanent magnet increases and impedes smooth movement
Solution Approach 1:
The shielding structure is segmented into two distinct shielding plates positioned at different locations and orientations. The first shielding plate (parallel to movement direction) provides primary shielding with minimal surface area, while the second shielding plate (perpendicular to movement direction) provides additional shielding for sensor devices located laterally. This segmentation allows effective magnetic field blocking without concentrating large surface area in one location, thereby reducing overall magnetic attraction force.
3Force
If strong permanent magnets are used to achieve large thrust, then the thrust is increased, but the magnetic field formed by the permanent magnets strongly influences nearby electrical components
Solution Approach 1:
The magnetic shielding member acts as an intermediary between the strong permanent magnets and the sensor devices/electrical components. The shielding member, made of strongly magnetic material, intercepts and redirects magnetic field lines, preventing them from directly reaching the sensor device. This allows the use of strong permanent magnets for high thrust while protecting nearby electrical components from excessive magnetic field influence.
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 provides enhanced magnetic shielding, preventing magnetic field interference with electrical components and maintaining smooth movement by reducing magnetic attraction forces, thus ensuring accurate operation and efficient thrust generation.
Implementation Method 1
a magnetic shielding member formed from strongly magnetic material that shields the magnetic shielding target
Implementation Method 2
generates thrust in the movement direction between the magnet and the coil by current being passed through the coil
Data Source
Figure 1~2
Figure 3~4
Figure 5~7
AI summary
A linear motor device comprising: a path member including a magnet extending in a movement direction; and a moving body including a coil that is movably mounted on the path member; the linear motor device generates thrust in the movement direction between the magnet and the coil by current being passed through the coil; the moving body including the coil further includes a magnetic shielding target object that requires mitigation from the influence of a magnetic field formed by the magnet, and a magnetic shielding member formed from strongly magnetic material that shields the magnetic shielding target; and, the magnetic shielding member includes a parallel shielding plate provided parallel to the movement direction between the magnetic shielding target object and the magnet, and a perpendicular shielding plate provided extending away from the magnet in a direction perpendicular to the movement direction at at least one of a front edge and a rear edge of the parallel shielding plate in the movement direction. Accordingly, the effect of magnetic shielding of the magnetic shielding target object from the magnetic field formed by the magnets is improved.