Magnetic Position Sensor Robustness via Dual-Field Detection
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Solution Overview
Problem
Existing position detection devices are not robust to assembly errors or environmental changes, such as temperature variations, due to their sensitivity to the interval and tilt between magnetic sensors and magnets, which affects their accuracy and reliability.
Innovation Solution
A position detection device with a magnetic detection unit and a calculation unit that calculates a position detection signal based on both longitudinal and transverse magnetic field signals, allowing the magnet and magnetic detection unit to be relatively movable while maintaining a predetermined interval, thereby enhancing robustness to assembly errors and environmental changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a position detection device uses a simple configuration with magnetic sensors and magnets, then the device complexity is reduced, but the device becomes sensitive to assembly errors and environmental changes
Solution Approach 1:
The patent combines both longitudinal and transverse magnetic field detection units into a single integrated position detection device. By merging multiple detection functions (longitudinal field detection and transverse field detection) into one device, it achieves robust position detection that is insensitive to assembly errors and environmental changes while maintaining configuration simplicity
Solution Approach 2:
The position detection device performs multiple detection functions simultaneously - it detects both longitudinal magnetic fields (for position detection) and transverse magnetic fields (for tilt detection). This multi-functionality allows the device to compensate for assembly errors and environmental changes while maintaining a simple configuration
2Measurement precision
If the position detection device sensitively reacts to tilt and interval changes, then it can detect position changes, but it becomes vulnerable to assembly errors and environmental changes
Solution Approach 1:
The calculation unit uses feedback from both longitudinal and transverse magnetic field detection units to calculate the position detection signal. By incorporating feedback from transverse field detection (which detects tilt) into the position calculation, the system can compensate for assembly errors and environmental changes while maintaining position detection sensitivity
Solution Approach 2:
The patent changes the detection parameters by introducing transverse magnetic field detection in addition to longitudinal field detection. This parameter expansion allows the system to detect both position and tilt, enabling compensation for assembly errors while maintaining measurement precision
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 a position detection device that is more robust to assembly errors and environmental changes, maintaining accuracy and reliability across varying conditions, and is suitable for applications like digital cameras, with a simple configuration that can be miniaturized.
Implementation Method 1
the magnetic detection unit has a longitudinal magnetic field detection unit that detects a magnetic field in a separating direction between the magnetic detection unit and the magnet, and a transverse magnetic field detection unit that detects a magnetic field in a moving direction of the magnet
Data Source
AI summary
A position detection device including a magnetic detection unit, a magnet, and a calculation unit that calculates a position detection signal based on a signal of the magnetic detection unit is provided. The magnet and the magnetic detection unit are relatively movable while maintaining a predetermined interval. The magnetic detection unit has a longitudinal magnetic field detection unit that detects a magnetic field in a separating direction between the magnetic detection unit and the magnet, and has a transverse magnetic field detection unit that detects a magnetic field in a moving direction of the magnet 1. A calculation unit 5 calculates a position detection signal based on a signal of the transverse magnetic field detection unit and a signal of the longitudinal magnetic field detection unit.