Torque Sensor Air Gap Compensation via Proximity Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Magnetostrictive torque sensors face inaccuracies due to sensitivity to the distance between the sensor poles and the object being measured, leading to unclear differentiation between torque and distance-related signals, resulting in inaccurate torque measurements.
Innovation Solution
Incorporating a proximity coil to measure the distance between the sensor poles and the object, with a controller adjusting the torque sensor output to compensate for the effects of the air gap, ensuring accurate torque measurement by integrating the distance information into the signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the distance between the sensor poles and the shaft varies, then the sensor can be installed with flexibility, but the measurement precision deteriorates due to gap-induced sensitivity effects
Solution Approach 1:
The system employs a proximity sensor to continuously monitor the air gap distance between the sensor poles and the shaft, feeding this information back to a controller. The controller dynamically adjusts the sensing parameters based on the measured gap distance, compensating for gap-induced sensitivity effects and maintaining measurement precision across varying installation conditions
Solution Approach 2:
The system changes the electrical parameters of the torque sensor based on the measured air gap distance. By adjusting parameters such as excitation current or sensing coil sensitivity in response to gap variations, the system compensates for the distance-dependent sensitivity changes and maintains accurate torque measurements
2Adaptability or versatility
If the air gap distance changes, then the sensor adapts to different positions, but the signal differentiation between torque and distance effects becomes difficult
Solution Approach 1:
The proximity sensor provides continuous feedback on the air gap distance, enabling the controller to distinguish between signal changes caused by torque variations and those caused by distance changes. This feedback mechanism allows the system to separate and independently measure torque and gap effects
Solution Approach 2:
The proximity sensor acts as an intermediary measurement device that independently measures the air gap distance. This separate measurement channel allows the system to decouple the torque sensing function from the distance variation effect, enabling clear differentiation between the two signal components
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 system effectively compensates for gap-induced sensitivity effects, providing accurate torque measurements independent of the air gap distance, thereby enhancing the precision of torque sensing systems.
Implementation Method 1
a driving coil that receives a driving current and emits a magnetic flux portion through a shaft
Implementation Method 2
a sensing coil that receives the magnetic flux portion and generates a first signal based at least in part on the received magnetic flux portion
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A system may include a first sensor and a second sensor. The first sensor may include a driving pole 20 that includes a driving coil 26 that receives a driving current and emits a magnetic flux portion through a structure 14. The first sensor may also include a sensing pole 20 that may include a sensing coil 30 that receives the magnetic flux portion and generate a first signal based at least in part on the received magnetic flux portion. The first signal is based at least in part on a force on the structure 14. The second sensor may be disposed on the driving pole 20 and may generate a second signal representative of a distance between the driving pole 20 and the structure 14. The system may also include a circuit 24 that may adjust the first signal based on the second signal.