Magnet Evaluating Device Eddy Current Loss
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Solution Overview
Problem
Conventional magnet evaluating devices require a large, costly setup with a well-insulated sample chamber and a strong magnetic field to measure eddy current loss, leading to increased size and expense.
Innovation Solution
A magnet evaluating device with an evaluation magnet and a master magnet, both formed by connecting magnetic sections with insulating material, an excitation coil generating an alternating magnetic field, and a detection coil to measure eddy currents, allowing for direct evaluation without the need for a large sample chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a well-insulated sample chamber is used to capture eddy current loss as heat, then measurement accuracy is improved, but device size and complexity increase
Solution Approach 1:
The patent replaces the thermal measurement system (thermocouple in insulated chamber) with an electromagnetic detection system. The detection coil directly measures eddy current-induced magnetic fields, eliminating the need for thermal insulation structures while achieving accurate eddy current loss evaluation through electromagnetic induction principles
Solution Approach 2:
The patent introduces a detection coil as an intermediary element that indirectly measures eddy current loss by detecting the magnetic field generated by eddy currents. This intermediary approach allows non-contact measurement without requiring direct thermal coupling or insulated chambers
2Force
If a large magnetic field generation device is used to reach the magnet through the sample chamber, then magnetic field strength is improved, but device size increases
Solution Approach 1:
The patent extracts the magnetic field generation function from a separate large device and integrates it directly into the evaluation apparatus. The excitation coil is positioned to generate magnetic fields directly at the magnet location without needing to penetrate through insulated chamber walls, reducing overall device volume while maintaining field strength
Solution Approach 2:
The patent merges the excitation coil and detection coil into a compact integrated structure that surrounds or positions near the magnet. This combined configuration allows both magnetic field generation and eddy current detection to occur in close proximity, eliminating the need for separate large-scale magnetic field generation equipment
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
Enables precise and cost-effective measurement of eddy current loss by comparing voltage or current generated in the detection coil during the passage of the evaluation and master magnets, reducing device size and cost while maintaining accuracy.
Implementation Method 1
an excitation coil that generates an alternating magnetic field
Implementation Method 2
a detection coil for detecting an eddy current occurring in the magnet
Implementation Method 3
detecting an eddy current occurring in the magnet
Data Source
Figure 1(a)~1(c)
Figure 2(a)~2(c)
Figure 3~4
AI summary
[Problem] To provide a magnet evaluating device with a simpler configuration that is capable of evaluating eddy current loss occurring in a magnet. [Solution] A magnet evaluating device 1 evaluates an evaluation magnet 51 by passing the evaluation magnet 51, which is formed by connecting a plurality of magnetic sections 101 with insulating material 103 in between, and a master magnet 55 of the same form through an alternating magnetic field generated by an excitation coil 12, measuring the eddy current occurring in the magnetic section 101 as voltage or current occurring in a detection coil 13 and comparing the measured value for the evaluation magnet 51 and the measured value for the master magnet 55.