Multi-Axis Magnetic Switch for Misalignment-Tolerant Sensing
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Solution Overview
Problem
Magnetic switches that detect magnetic fields in only one direction are prone to misalignment issues, leading to uncertainty and potential malfunctions, as they fail to accurately detect the presence of magnetic objects due to reduced signal detection when fields are misaligned, and existing solutions for multi-directional sensing are either simplistic or require complex calculations and memory usage.
Innovation Solution
A magnetic switch that detects magnetic fields in two or three directions by providing signals representative of the absolute values of these fields, which are then compared to threshold values using simple processing, allowing for accurate detection with minimal power consumption and easy implementation, using sensing elements like Hall effect sensors and analog or digital signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic field sensing is performed in only one direction, then the device complexity is low, but the reliability deteriorates due to misalignment issues and reduced signal detection
Solution Approach 1:
The patent transitions from single-direction magnetic field sensing to multi-directional sensing by adding sensing elements oriented in different directions (e.g., perpendicular directions). This dimensional expansion allows the system to detect magnetic fields regardless of their orientation, eliminating misalignment issues and improving detection reliability without requiring complex vector calculations.
2Measurement precision
If magnetic field sensing is performed in multiple directions using complex vectorial calculations, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The patent extracts only the essential information needed for detection by using multiple sensing elements oriented in different directions, each detecting the magnetic field component in its specific direction. Instead of performing complex vector calculations to determine the total field magnitude and direction, the system simply monitors the output signals from multiple simplified sensors, thereby achieving accurate detection with minimal processing complexity.
3Measurement precision
If magnetic field sensing is performed in multiple directions using extensive memory usage, then the measurement precision improves, but the use of energy increases
Solution Approach 1:
The patent employs sensing elements that directly provide signals representative of the absolute values of magnetic field components in different directions. The system processes these signals through simple operations (such as comparing the sum of absolute values against a threshold) without requiring extensive memory storage or complex computational algorithms, thereby achieving accurate multi-directional detection with minimal energy consumption.
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 accurate and reliable magnetic field detection in any direction with reduced processing power and energy consumption, avoiding misalignment issues and complex calculations, while maintaining high sensitivity and resolution for commercial applications.
Implementation Method 1
sensing elements like Hall effect sensors
Data Source
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AI summary
A magnetic switch is provided, comprising a magnetic field sensing system configured for providing a first signal representative of the absolute value of a first component of the magnetic field in a first direction and at least a second signal representative of the absolute value of a second component of the magnetic field in a further direction different from the first direction. It includes comparing means adapted for comparing the sum of the absolute values of at least the first and second signals with a threshold value. The magnetic sensor further comprises a connection to the comparing means for providing at least one status signal as output of the switch.