Magnetic Sensor With Segmented Sensing Assemblies for Interference Rejection
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Solution Overview
Problem
Magnetic sensors face limitations in accuracy and interference resistance due to restricted manufacturing and usage, leading to suboptimal detection results, especially when sensing directions are not aligned optimally.
Innovation Solution
The magnetic sensor design includes a sensing assembly with a magnetic aggregation element and adjacent sensing elements, arranged on a base plate to adjust magnetic induction lines, allowing for different sensing directions and reducing interference by having two sets of sensing assemblies with varying relative positions to the magnetic pole, enabling contrast and improved detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a sensor is configured to have at least a horizontal sensing direction to complete state detection, then the detection coverage is improved, but the cost increases and the accuracy of detection results deteriorates
Solution Approach 1:
The sensor divides the detection task into two parts: one sensing assembly detects the target magnetic pole, while another sensing assembly detects the background magnetic field. By segmenting the detection function and processing the signals separately, the system achieves both comprehensive detection coverage and high accuracy without requiring multiple sensing directions.
2Measurement precision
If a magnetic sensor has a vertical or horizontal sensing direction, then the sensing capability in that direction is improved, but the other sensing direction interferes leading to deterioration of detection effect
Solution Approach 1:
The patent extracts the background magnetic field information from the total magnetic field signal by using a second sensing assembly that is insensitive to the target magnetic pole's position changes. This extracted background field is then subtracted from the total signal to eliminate interference, allowing the sensor to maintain high sensing capability without cross-directional interference.
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 design enhances detection accuracy and resistance to interference, allowing for precise state data collection, including angle, velocity, and rotation, while reducing manufacturing costs and energy consumption.
Implementation Method 1
enables adjustment of the directions of magnetic induction lines at the sensing elements by arranging the magnetic aggregation elements near the sensing elements
Data Source
AI summary
The present invention discloses a magnetic sensor and a state detection apparatus and method. The magnetic sensor comprises a sensing assembly and a base plate. The sensing assembly comprises a magnetic aggregation element and at least one sensing element adjacent to an extension surface of the magnetic aggregation element. At least two sensing assemblies are arranged on a carrying surface of the base plate. When the magnetic sensor approaches a magnet to be detected, one of the sensing assemblies is relatively close to a first magnetic pole of the magnet to be detected and another of the sensing assemblies is relatively away from the first magnetic pole, at least in a first state. The magnetic sensor provided by the present invention can give consideration to both the anti-interference performance and the universal application of the device, and can eliminate restrictions in manufacture and use of traditional magnetic sensors.