Magnetostrictive Torque Sensor with Integrated Temperature Compensation
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Solution Overview
Problem
Existing magnetostrictive torque sensors face challenges when used with untreated rotary shafts, as they require costly retro-fitting and are prone to inaccurate measurements due to temperature variations and magnetic interference, especially when separate temperature sensors are used.
Innovation Solution
A non-contact magnetostrictive torque sensor system with an integrated temperature sensor that measures the temperature of the shaft in real-time, positioned in a torque measurement neutral region to avoid interfering with the magnetic flux, allowing for accurate torque and temperature measurements without the need for pre-magnetization of the shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If separate temperature sensors are used to measure shaft temperature, then temperature monitoring capability is improved, but electrical interference and magnetic interference increase
Solution Approach 1:
The temperature sensor is integrated within the sensor head housing of the magnetostrictive torque sensor, combining temperature monitoring functionality with the existing torque sensing structure. This eliminates the need for separate external temperature sensors that would introduce additional electrical and magnetic interference, while still providing accurate temperature measurement at the shaft location.
2Ease of manufacture
If magnetostrictive sensors are used with untreated rotary shafts, then installation complexity is reduced, but measurement accuracy deteriorates due to temperature variations
Solution Approach 1:
The integrated temperature sensor provides real-time temperature feedback to the control system. This temperature data is used to compensate for thermal effects on the magnetostrictive sensor measurements, allowing accurate torque measurements to be maintained despite temperature variations. The system automatically adjusts measurements based on the measured temperature, eliminating the need for pre-magnetization of the shaft.
3Reliability
If shaft pre-magnetization is performed to enable magnetostrictive sensing, then sensor functionality is improved, but manufacturing cost and complexity increase
Solution Approach 1:
The magnetostrictive sensor system generates its own magnetic flux through the driving coil wound around the driving pole. This self-generated magnetic field eliminates the need for external pre-magnetization of the shaft, allowing the sensor to function on untreated shafts directly. The sensor head contains all necessary magnetic components to operate independently without requiring shaft modification.
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 solution increases the accuracy of torque measurements by compensating for temperature variations and reduces costs associated with shaft treatment, enabling efficient retro-fitting and improved control of machinery by integrating temperature sensing directly with the torque sensing system.
Implementation Method 1
a driving coil that may receive a driving current and may emit a magnetic flux portion through a rotary structure
Implementation Method 2
The received magnetic flux portion is based at least in part on a force on the rotary structure
Data Source
AI summary
A system includes a magnetostrictive sensor having a sensor head including a driving pole. The driving pole includes a driving coil that may receive a driving current and may emit a magnetic flux portion through a rotary structure. The sensor head also includes a sensing pole including a sensing coil that may receive the magnetic flux portion and may transmit a signal based at least in part on the received magnetic flux portion. The received magnetic flux portion is based at least in part on a force on the rotary structure. The sensor head also includes a temperature sensor disposed on the sensor head. The temperature sensor may measure a temperature of the rotary structure.