Mirror Magnet Active Cancellation for Magnetic Sensor Cross-Talk
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Magnetic interference, or 'cross-talk,' between torque and angle sensors leads to incorrect readings, and existing solutions like increasing distance or using magnetic shielding result in bulky sensors or inferior performance.
Innovation Solution
A sensing system that includes a mirror magnet positioned symmetrically to cancel out the magnetic flux of another sensor, allowing the magnetic sensing element to detect only the intended magnetic flux, thereby reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the distance between two sensors is physically increased to reduce cross-talk, then magnetic interference is reduced, but the sensor package becomes bulky
Solution Approach 1:
A mirror magnet is introduced as an intermediary element between the two sensors. This mirror magnet generates a compensating magnetic field that counteracts the cross-talk interference from the second sensor, allowing the first sensor to operate accurately without increasing the physical distance between sensors.
Solution Approach 2:
The invention converts the harmful magnetic cross-talk into a useful effect by positioning a mirror magnet to generate an opposing magnetic field. The interference field from the second sensor is transformed into a balanced system where the mirror magnet's field cancels out the unwanted cross-talk, turning the problematic magnetic interaction into a solution.
2Object-affected harmful factors
If magnetic shielding is used to reduce cross-talk, then magnetic interference is reduced, but the sensor package becomes bulky
Solution Approach 1:
Instead of using physical magnetic shielding materials that add volume, the invention employs a mirror magnet as an active intermediary. This mirror magnet dynamically generates a compensating magnetic field that neutralizes cross-talk interference, achieving the same protective effect without the bulk of passive shielding materials.
Solution Approach 2:
The invention replaces the mechanical/passive magnetic shielding approach with an active magnetic field-based solution. Rather than using physical barriers (mechanical shielding) to block magnetic interference, the system uses a mirror magnet to generate an opposing magnetic field that actively cancels the interference.
3Object-affected harmful factors
If magnetic shielding is used to reduce cross-talk, then magnetic interference is reduced, but sensor performance deteriorates
Solution Approach 1:
The mirror magnet converts the harmful cross-talk magnetic field into a beneficial effect by generating an equal and opposite field. This active compensation ensures that the net interference at the sensor location is canceled out, maintaining high measurement precision without the performance degradation that occurs with passive magnetic shielding.
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 effectively reduces magnetic interference, improving sensor accuracy without increasing sensor size or compromising performance.
Implementation Method 1
A first sensor includes a first magnet, first and second stators, first and second collectors, and a magnetic sensing element. A second sensor is located proximate the first sensor and includes a second magnet. A mirror magnet is positioned within the first sensor such that a mirror magnetic flux of the mirror magnet is symmetrical to a second magnetic flux of the second sensor
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A sensing system including a first magnet having a first magnetic field. In one embodiment, the sensing system also includes a first stator configured to receive the first magnetic field and a second stator configured to receive the first magnetic field. A first collector is configured to collect the first magnetic field from the first stator, a second collector is configured to collect the first magnetic field from the second stator, and a magnetic sensing element is configured to sense the first magnetic field. The sensing system also includes a second magnet having a second magnetic field, and a third magnet having a third magnetic field. The third magnet is positioned such that the third magnetic field is symmetrical to the second magnetic field.