Position Sensor with Coincident Detection Element Centers
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Solution Overview
Problem
Dual system position sensors experience inter-system errors due to phase differences in signals generated by magnetic resistance elements with in-plane distributed magnetic fields, leading to inaccuracies in detected positions.
Innovation Solution
A position sensor configuration with a detector and signal processor, featuring a sensor chip with first and second detection elements, where the centers of balance coincide, processing signals to minimize inter-system errors by averaging magnetic field changes, thus generating similar detection signals despite being a dual system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dual system position sensor is used to detect position, then detection coverage and reliability are improved, but inter-system errors occur due to phase differences in signals from magnetic resistance elements
Solution Approach 1:
The patent combines multiple magnetic resistance elements into a single detector unit, where first and second magnetic resistance elements are integrated on one sensor chip. This merging approach allows the system to process multiple detection signals through a unified signal processing path, eliminating inter-system errors while maintaining the reliability benefits of multi-element detection.
Solution Approach 2:
The patent introduces a signal processing mechanism that acts as an intermediary between the magnetic resistance elements and the output. By processing signals from multiple elements through a common intermediary system with coincident centers of balance, the patent eliminates phase differences and inter-system errors while preserving detection reliability.
2Adaptability or versatility
If multiple magnetic resistance elements are disposed at different positions to detect in-plane distributed magnetic fields, then detection capability is improved, but phase differences in generated signals cause inter-system errors
Solution Approach 1:
The patent applies local quality by positioning magnetic resistance elements at specific locations with defined orientations relative to the magnetic field source. Each element is strategically placed to detect specific field components, and the signal processing system compensates for local variations to maintain overall signal consistency and eliminate phase differences.
Solution Approach 2:
The patent employs asymmetric arrangement of magnetic resistance elements and their corresponding signal processing paths. By intentionally designing asymmetric positions and orientations of elements while maintaining coincident centers of balance in the signal processing system, the patent achieves both versatile detection capability and signal consistency, eliminating inter-system errors.
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 configuration effectively eliminates inter-system errors in detected positions, ensuring accurate detection even in dual system setups by aligning the centers of balance and averaging magnetic field changes, resulting in consistent detection signals.
Implementation Method 1
Each magnetic resistance element is included in a first set of magnetic resistance element pair and a second set of magnetic element pair
Data Source
AI summary
A position sensor includes a detector and a signal processor. The detector includes: a sensor chip having a surface; a first detection element disposed at the surface of the sensor chip; and a second detection element disposed at the surface of the sensor chip. The signal processor processes a signal input from the detector. The first detection element outputs a first detection signal corresponding to a position of a detection target, based on a change in a magnetic field received from the detection target. The second detection element outputs a second detection signal corresponding to the position of the detection target, based on the change in the magnetic field received from the detection target. A center of balance of the first detection element coincides with a center of balance of the second detection element.