Magnetic Sensor Support Field Stabilization
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Solution Overview
Problem
Existing devices for determining the position of a magnetic field-generating element relative to a device using magnetic field-sensitive sensors face challenges with measurement accuracy due to weak magnetic fields and interference, particularly with magnetoresistive sensors that can produce undefined signals under external fields.
Innovation Solution
A support field device generating a magnetic support field with identical direction and homogeneous strength is used to stabilize the sensor operation, allowing the use of magnetic field-generating elements with weak field strengths and ensuring reliable magnetic saturation, thereby modifying the sensor characteristic curve to maintain linearity across varying field strengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If smaller magnets are used to reduce contamination, then contamination risk is reduced, but magnetic field strength decreases leading to measurement accuracy deterioration
Solution Approach 1:
A support field device is introduced as an intermediary element that generates a magnetic support field to compensate for the weak magnetic fields produced by smaller magnets. This mediator ensures that sufficient magnetic field strength is available at the sensor for accurate position determination, while allowing the use of smaller magnets that reduce contamination risk.
Solution Approach 2:
The magnetic field strength parameter is modified by introducing a support field with controllable strength. This allows the system to maintain adequate field strength for measurement accuracy while using smaller magnets, effectively changing the field parameters without increasing magnet size.
2Measurement precision
If magnetoresistive sensors are used to detect magnetic fields, then position detection capability is improved, but signal stability deteriorates under external fields causing undefined signals
Solution Approach 1:
A support field is applied in advance to magnetoresistive sensors to pre-saturate them and stabilize their operating state. This preliminary action prevents signal instability and undefined outputs when external magnetic fields are present, ensuring reliable position detection.
Solution Approach 2:
The operating parameters of magnetoresistive sensors are modified by applying a support field that shifts their operating point to a stable region. This parameter change ensures that the sensors produce defined, stable signals even in the presence of external magnetic fields.
3Measurement precision
If larger magnets are used to increase field strength, then measurement accuracy is improved, but contamination risk increases
Solution Approach 1:
The magnetic field generation function is segmented between two components: smaller magnets that minimize contamination and a support field device that provides additional field strength. This segmentation allows the system to achieve adequate field strength without using large magnets that would increase contamination risk.
Solution Approach 2:
The support field device acts as a mediator that compensates for the reduced field strength from smaller magnets, enabling the system to maintain measurement accuracy while using contamination-reducing small magnet sizes.
4Reliability
If a support field device is introduced to stabilize sensor operation, then signal reliability is improved, but device complexity increases
Solution Approach 1:
The support field device is designed to serve multiple functions: stabilizing magnetoresistive sensors, compensating for weak magnetic fields from small magnets, and ensuring adequate field strength for accurate measurement. This multi-functionality justifies the added complexity by addressing multiple problems simultaneously.
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 enhances the accuracy of position determination by maintaining a stable operating state and enabling the use of smaller magnets, reducing contamination risks and interference effects, while allowing the device to function with different magnetic field elements.
Implementation Method 1
a support field device is provided, which generates in the magnetically sensitive sensors (4) a magnetic support field
Implementation Method 2
at least two magnetically sensitive sensors (4) are disposed along a measurement path (100)
Implementation Method 3
ensuring reliable magnetic saturation
Data Source
AI summary
The invention relates to a device for generating a sensor signal, the profile thereof depending on the position of a magnetic field-generating element relative to the device, with at least two magnetically sensitive sensors disposed along a measurement path, wherein a support field device, which generates a magnetic support field in the magnetically sensitive sensors, has at least in the magnetically sensitive sensors an essentially identical direction and an essentially homogeneous field strength.