Magnetostrictive Torque Sensor Field Guiding for Stronger Signals
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Solution Overview
Problem
Existing torque sensors based on magnetostriction suffer from low signal-to-noise ratio and uncertainty in torque measurements due to weak magnetic fields generated at low torques, leading to inaccurate readings.
Innovation Solution
A torque sensor design that includes a shaft with magnetized regions generating magnetic fields, and which are guided to and/or from magnetization of the shaft sensor, and magnetic field sensors, and magnetic field sensors, and a magnetic field guiding arrangement for detecting the magnetic field, and a magnetic field guiding arrangement, and a magnetic field guiding arrangement for detecting the magnetic field, and a magnetic field guiding arrangement, and a magnetic field guiding arrangement for guiding the magnetic fields to the magnetic field sensor, thereby amplifying the measurement signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic field sensors are mounted without contact near the magnetized shaft to detect magnetic field changes, then the torque sensor can measure torque without physical contact, but the magnetic field strength at the measurement point is weak resulting in low signal-to-noise ratio
Solution Approach 1:
Magnetic field guiding elements are introduced as intermediary components between the magnetized shaft and the magnetic field sensor. These guiding elements channel and concentrate the magnetic field lines from the shaft toward the sensor location, thereby amplifying the magnetic field strength at the measurement point without requiring physical contact between the shaft and sensor.
Solution Approach 2:
The magnetic field guiding elements are positioned in the spatial dimension between the shaft and sensor, creating a directed path for magnetic field lines. This dimensional arrangement transforms the diffuse magnetic field into a concentrated flux path, enhancing the signal strength at the sensor location while maintaining contactless operation.
2Measurement precision
If magnetic field guiding elements are introduced to amplify the magnetic field at the sensor location, then the signal strength increases, but the device structure becomes more complex
Solution Approach 1:
The magnetic field guiding elements are strategically positioned only in specific regions where magnetic field concentration is needed, rather than enclosing the entire shaft-sensor assembly. This localized approach enhances the magnetic field at critical measurement points while minimizing the overall structural complexity and number of components required.
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
The design improves the accuracy of torque measurements by bundling and amplifying magnetic fields, allowing for precise correction of signals and compensation against extraneous magnetic fields, resulting in enhanced measurement precision.
Implementation Method 1
a shaft (10) having a first magnetized region (11) which generates a first magnetic field (B1) as a function of a torque applied to the shaft (10)
Implementation Method 2
a first magnetic field guiding arrangement (31, 32) for guiding the first magnetic field (B1) to the location of the first magnetic field sensor (21)
Implementation Method 3
magnetic field sensors based on a magnetoresistive effect are used, which can detect not only the strength of the magnetic field, but also the direction of the magnetic field
Data Source
AI summary
A torque sensor comprises: a shaft having a first magnetized region which generates a first magnetic field in response to a torque applied to the shaft; a first magnetic field sensor for detecting the first magnetic field, the magnetic field sensor being adapted to output a signal in response to a strength of the first magnetic field at the location of the first magnetic field sensor; and a first magnetic field guiding arrangement for guiding the first magnetic field to the location of the first magnetic field sensor.