Torque Sensor Device with Opposing Magnetic Fluxes
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Solution Overview
Problem
Torque sensor devices for steering shafts in motor vehicles face interference from external magnetic fields, leading to erroneous torque measurements due to crosstalk, which existing solutions struggle to effectively compensate for without knowing the direction of the interfering field.
Innovation Solution
A torque sensor device with a magnetic arrangement and stator arrangement configured to generate opposing magnetic fluxes, allowing for the detection of both fluxes by separate sensors and subsequent calculation of their difference to remove interference, thereby compensating for external magnetic interference fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single magnetic flux path is used in conventional torque sensors, then the device structure is simple, but external magnetic interference causes erroneous torque measurements
Solution Approach 1:
The single magnetic flux path is segmented into two separate flux paths (first and second magnetic flux paths) with opposite polarity. Each path is detected by separate magnetic sensors, allowing differential measurement that cancels external magnetic interference while maintaining structural simplicity.
Solution Approach 2:
The invention changes the magnetic flux parameter by creating opposing polarity flux paths. The first magnetic flux path has north pole facing the first stator and south pole facing the second stator, while the second magnetic flux path has south pole facing the first stator and north pole facing the second stator. This parameter change enables interference cancellation through differential measurement.
2Reliability
If magnetic interference compensation is attempted without knowing field direction, then device complexity increases, but compensation effectiveness remains insufficient
Solution Approach 1:
The invention applies preliminary anti-action by pre-configuring two magnetic flux paths with opposite polarity before external interference occurs. The opposing flux paths create a differential measurement system that automatically counteracts external magnetic interference without requiring additional compensation mechanisms or knowledge of interference direction.
Solution Approach 2:
The invention converts the harmful effect of external magnetic interference into a beneficial differential measurement approach. By using opposing polarity flux paths, the system transforms potential interference into a canceling effect where external fields affect both paths equally and are eliminated through subtraction.
3Measurement precision
If opposing magnetic flux paths with opposite polarity are used, then external magnetic interference is compensated, but the device structure becomes more complex
Solution Approach 1:
The invention merges the functionality of interference rejection and torque measurement into a single integrated magnetic arrangement. The first and second magnetic flux paths share common magnetic elements (first and second magnetic elements with opposite polarity), combining multiple functions into one compact structure that achieves precision without excessive complexity.
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 enables accurate torque measurement by averaging out external interference, providing a reliable and simple method to isolate the useful torque signal, even in the presence of external magnetic interference.
Implementation Method 1
The magnetic arrangement (12) is configured for generating a magnetic flux
Implementation Method 2
The stator arrangement (11) is configured for conducting the generated magnetic flux to the magnetic sensor arrangement (13)
Implementation Method 3
A conclusion can thus be drawn regarding the angle of torsion from the change in the detected flux density
Data Source
AI summary
A torque sensor device for detecting a torque applied to a shaft, includes a magnetic arrangement, a stator arrangement and a magnetic sensor arrangement. The magnetic arrangement is configured for generating at least one magnetic field. A magnetic flux can be generated in the stator arrangement. The magnetic arrangement and the stator arrangement are movable relative to each other in the circumferential direction. The magnetic arrangement and the stator arrangement are arranged relative to each other so that, by a relative movement between the magnetic arrangement and the stator arrangement in the circumferential direction about a center axis of the torque sensor device, a first magnetic flux with a first magnetic flux direction and a second magnetic flux with a second flux direction opposite to the first flux direction can be generated in the stator arrangement.