Actuator Coil Interval Width for Stable Magnet Movement
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Solution Overview
Problem
Conventional actuators with coils on multiple layers face difficulties in controlling the movement of permanent magnets due to abrupt changes in electromagnetic force, which occur when the magnets move perpendicular to the coil axis, leading to unstable magnetic flux density.
Innovation Solution
The actuator design includes a coil with conductor patterns on multiple layers of insulating base material, where the closest conductor pattern to the permanent magnet has a smaller interval width than other patterns, maintaining a consistent overlapping width with the magnet, thereby reducing abrupt changes in electromagnetic force and facilitating controlled movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a coil with conductor patterns on multiple layers is used, then the magnetic field strength is improved, but the electromagnetic force changes abruptly causing control difficulty
Solution Approach 1:
The patent applies local quality by making the interval width of the closest conductor pattern smaller than that of other conductor patterns. This creates a non-uniform structure where the region closest to the permanent magnet has different geometric properties, resulting in more stable magnetic flux density and reduced abrupt changes in electromagnetic force during magnet movement.
2Length of moving object
If the permanent magnet moves perpendicular to the coil axis, then the movement range is improved, but the magnetic flux density becomes unstable
Solution Approach 1:
The patent makes the interval width of the closest conductor pattern smaller to create a localized region with enhanced magnetic field stability. This local modification ensures that as the permanent magnet moves perpendicular to the coil axis, the magnetic flux density remains more stable, preventing abrupt changes in electromagnetic force while maintaining the desired movement range.
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 design ensures stable and controlled movement of the permanent magnet by maintaining a consistent electromagnetic force, reducing fluctuations and enhancing control precision.
Implementation Method 1
moves a permanent magnet by a magnetic field provided by a coil in a movement direction perpendicular or substantially perpendicular to a coil axis of the coil
Implementation Method 2
an electromagnetic force to the permanent magnet may abruptly change depending on a position of the permanent magnet
Data Source
AI summary
An actuator includes a coil that provides a magnetic field to move a permanent magnet in a moving direction perpendicular to a coil axis. The coil includes conductor patterns on an insulating base material layer. The permanent magnet is located above insulating base material layer so that a polar direction of the permanent magnet is the moving direction. The conductor patterns include a closest conductor pattern closest to the permanent magnet. A first maximum width of an interval inside the closest conductor pattern in the polar direction is smaller than a second maximum width of an interval inside another conductor pattern in the polar direction. An overlapping width in the polar direction between the interval of the first maximum width inside the closest conductor pattern and the permanent magnet is the first maximum width regardless of a position of the permanent magnet.