Magneto-Electric Transducer Sensor for Magnetic Field Variation Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing magnetic force sensors face challenges in precisely detecting and correcting variations in the magnetic field generated by a magnetic flux source due to temperature changes and other environmental factors, often requiring additional components like temperature compensation circuits, which increase size and cost while struggling to accurately measure average temperatures.
Innovation Solution
A compact magnetic force sensor design that includes a resiliently supported action portion, a first magneto-electric transducer for displacement detection, a second transducer fixed relative to the magnetic flux source for correction, and an operational processing section that adjusts the first transducer's output based on the second transducer's output, eliminating the need for a separate temperature compensation circuit and allowing real-time correction of magnetic field variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a temperature compensation circuit with a temperature sensor is used to compensate for magnetic field changes, then the magnetic field variation can be corrected, but the device size and cost increase
Solution Approach 1:
The patent merges the temperature compensation function into the magneto-electric transducer itself. The transducer serves dual purposes: detecting the magnetic field for force measurement and simultaneously detecting temperature changes through its inherent temperature coefficient. This eliminates the need for separate temperature sensors and compensation circuits, reducing device size and cost while maintaining detection accuracy
Solution Approach 2:
The magneto-electric transducer is designed to perform multiple functions: it acts as both the primary magnetic field sensor for force detection and as a temperature sensor for compensation. By making the transducer multi-functional, the patent avoids adding extra components, thereby simplifying the overall device structure while ensuring reliable magnetic field variation correction
2Reliability
If a separate temperature sensor is used for compensation, then temperature changes can be detected, but the sensor cannot precisely measure the average temperature of the permanent magnet due to heat capacity differences and localized temperature rises
Solution Approach 1:
The magneto-electric transducer measures its own temperature environment directly at the magnetic flux generating source. Since the transducer is positioned adjacent to the permanent magnet and experiences the same thermal conditions, it provides accurate real-time temperature data without relying on separate sensors that may be thermally isolated. This self-service approach ensures precise temperature measurement for effective compensation
3Force
If a permanent magnet is used as the magnetic flux generating source, then the magnetic field can be generated, but the magnetic field strength changes with temperature requiring compensation
Solution Approach 1:
The patent implements a feedback mechanism where the magneto-electric transducer continuously monitors the magnetic field strength and temperature conditions. Based on this feedback, the system calculates the temperature-induced magnetic field variation and applies real-time compensation to maintain accurate force measurements. This closed-loop feedback ensures magnetic field stability despite temperature fluctuations
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 design enables precise detection and correction of magnetic field changes caused by factors other than temperature, providing a compact and cost-effective solution for accurately measuring forces and moments applied to the sensor, while maintaining sensitivity and reducing the influence of environmental changes.
Implementation Method 1
a first magneto-electric transducer fixed to the action portion... a second magneto-electric transducer disposed at a fixed position with respect to the magnetic flux generating source
Data Source
AI summary
The present invention provides a magnetic force sensor that can precisely detect and correct variations in a magnetic field generated by a magnetic flux generating source. Therefore, a displacement magneto-electric transducer, which detects a change in the magnetic field caused by an external force, and a fixed magneto-electric transducer, where the change in the magnetic field caused by the external force does not occur, are provided to face end sides of magnetic poles of the magnetic flux generating source. The fixed magneto-electric transducer detects a variation of the magnetic field caused by, for example, changes with time and environmental variations such as a temperature rise in the interior of the sensor. On the basis of a detection amount thereof, an operational section performs a correction operation, so that a sensitivity coefficient or an offset of the displacement magneto-electric transducer is corrected.