Magnetically Anisotropic Flux Guide for Hall Sensor Spacing
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Solution Overview
Problem
Position sensor systems face a decline in magnetic flux density when Hall effect sensors are positioned farther away from magnets, leading to inadequate binary output signals, which is a limitation for increased sensor-magnet spacings due to heat or packaging constraints.
Innovation Solution
Incorporating a magnetically anisotropic flux guide with alternating layers of ferro-magnetic and non-magnetic materials between the magnets and Hall effect sensors to enhance magnetic flux guidance and density at greater sensor-magnet distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If Hall effect sensors are positioned farther away from magnets, then heat damage to sensors is avoided and packaging flexibility is improved, but magnetic flux density decreases rapidly leading to inadequate binary output signals
Solution Approach 1:
A flux guide structure is introduced as an intermediary component between the magnets and Hall effect sensors. This flux guide acts as a mediator that channels and concentrates magnetic flux from the magnets to the sensors, enabling the sensors to be positioned farther from the magnets while maintaining sufficient magnetic flux density for reliable binary output signals.
Solution Approach 2:
The magnetic flux density distribution is modified by introducing the flux guide structure. This changes the magnetic field parameters in the region between the magnets and sensors, creating a concentrated flux path that maintains high flux density at increased sensor-magnet spacings.
2Reliability
If Hall effect sensors are positioned closer to magnets, then magnetic flux density is maximized for reliable signals, but sensor damage from heat and packaging constraints are worsened
Solution Approach 1:
The flux guide serves as a protective intermediary that allows sensors to be positioned at safer distances from heat-generating components while still maintaining reliable signal acquisition through concentrated magnetic flux guidance.
3Adaptability or versatility
If sensor-magnet spacing is increased, then packaging flexibility and mounting options are improved, but magnetic flux density becomes insufficient for triggering Hall effect devices
Solution Approach 1:
The flux guide structure enables increased sensor-magnet spacing by acting as a mediator that maintains magnetic flux density over longer distances, thereby providing mounting flexibility while ensuring reliable Hall effect device triggering.
Solution Approach 2:
The magnetic field distribution parameters are changed by the flux guide, creating a concentrated flux path that maintains sufficient flux density at increased distances, thereby enabling greater adaptability in sensor positioning.
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 maintains or increases magnetic flux density at increased sensor-magnet spacings, ensuring reliable binary output signals and reducing assembly costs by allowing flexible sensor mounting locations.
Implementation Method 1
a flux guide positioned in the flux path between the magnets and the Hall effect sensor
Implementation Method 2
enhance magnetic flux guidance and density at greater sensor-magnet distances
Implementation Method 3
Hall effect sensors 18, 20, 22 provide binary output signals depending upon the polarity of the magnetic field they are facing
Data Source
AI summary
A position sensor system including a magnet, a magnetic flux sensor positioned a distance away from the magnet, the magnetic flux sensor and the magnet defining a flux path therebetween, and a flux guide positioned in the flux path to guide magnetic flux to the magnetic flux sensor.