Magnetic Position Sensing Using Field Ratios
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Solution Overview
Problem
Current movement sensing devices require burdensome calculations for position determination, necessitating greater processing power due to the use of circular or trigonometric functions, which can be resource-intensive.
Innovation Solution
A sensor arrangement featuring a ring magnet that can rotate and linearly displace along its vertical axis, with magnetic sensor circuitry positioned at a non-centered offset to generate spatial magnetic data, allowing for the determination of displacement position using a ratio of magnetic field components, thereby simplifying calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If circular or trigonometric functions are used for position determination, then measurement precision is improved, but processing power requirements and computational complexity increase
Solution Approach 1:
The patent changes the mathematical parameters used for position determination from circular/trigonometric functions to simple ratio calculations of magnetic field components. By transforming the calculation approach to use basic arithmetic operations (division and subtraction) instead of complex trigonometric functions, the system maintains measurement precision while significantly reducing processing power requirements and computational complexity.
2Device complexity
If magnetic sensor circuitry is positioned at non-centered offset, then computational complexity is reduced, but measurement precision may be affected
Solution Approach 1:
The patent deliberately positions the magnetic sensor circuitry at a non-centered offset from the ring magnet, creating an asymmetric configuration. This asymmetric placement simplifies the computational model by eliminating the need for complex trigonometric calculations, as the offset geometry allows for straightforward ratio-based determination of displacement position using basic arithmetic operations.
3Device complexity
If simple arithmetic operations are used for position determination, then processing power is reduced, but measurement precision may deteriorate
Solution Approach 1:
The patent substitutes complex mathematical calculations (trigonometric functions) with simpler arithmetic operations (ratio calculations). By replacing the mechanical/computational complexity of circular functions with basic arithmetic operations on magnetic field components, the system achieves both reduced processing power requirements and maintained measurement precision through the mathematical relationship between magnetic field ratios and displacement position.
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 approach reduces processing overhead by using magnetic field ratios to determine the position of the ring magnet, enhancing computational efficiency in position sensing applications.
Implementation Method 1
at least one magnetic sensor circuitry positioned a non-centered offset distance apart from the ring magnet in a plane perpendicular to the vertical axis, the at least one magnetic sensor circuitry configured to generate spatial magnetic data from one or more magnetic fields produced by linear displacement of the ring magnet
Data Source
AI summary
A sensor arrangement includes a ring magnet linearly displaceable along its vertical axis of the ring magnet and including an outer ring section of a first pole pair, an inner ring section of a second pole pair. At least one magnetic sensor circuitry is positioned a non-centered offset distance apart from the ring magnet in a plane perpendicular to the ring magnet's vertical axis. The at least one magnetic sensor can generate spatial magnetic data produced by linear displacement of the ring magnet. A computing unit coupled to the at least one magnetic sensor circuitry and configured to obtain the spatial magnetic data and to determine amount of displacement of the ring magnet after a linear displacement of the ring magnet based on the obtained spatial magnetic data.