Permanent Magnet Measurement Apparatus Surface Deterioration Compensation
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Solution Overview
Problem
Existing methods for measuring the characteristics of permanent magnets face significant errors due to surface deterioration, especially when small sample sizes are used, leading to inaccurate magnetization measurements.
Innovation Solution
A measurement apparatus and method that acquire magnetization curve data and shape parameters from two samples of the same material but different sizes, calculate the magnetization of the inner part by separating surface and inner magnetization components based on a volume ratio, and output corrected magnetization curve data to remove measurement errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If small sample sizes are used for measurement, then measurement efficiency is improved, but measurement precision deteriorates due to surface deterioration influence
Solution Approach 1:
The patent segments the magnetization measurement into two distinct components: surface magnetization and inner part magnetization. By measuring the total magnetization and separately estimating the surface magnetization based on surface area, the inner part magnetization can be isolated through subtraction. This segmentation allows accurate determination of bulk material properties even from small samples where surface effects are significant.
Solution Approach 2:
The patent applies different measurement and calculation approaches to different regions of the sample. The surface region is handled through separate characterization (using surface area measurements and assumed surface magnetization values), while the inner region is determined through the calculated separation. This local quality approach recognizes that surface and bulk materials may have different magnetic properties due to oxidation or other surface effects.
2Device complexity
If surface deterioration is present, then measurement complexity increases, but measurement precision deteriorates due to error introduction
Solution Approach 1:
The patent extracts the surface magnetization component from the total magnetization measurement. By calculating the surface area of the sample and using it to determine the surface magnetization contribution, this component can be removed from the total measurement to isolate the inner part magnetization. This extraction eliminates the harmful effect of surface deterioration on the bulk material characterization.
Solution Approach 2:
The patent converts the harmful effect of surface deterioration into a beneficial measurement approach. Instead of discarding small samples that show surface effects, the method uses the surface area measurement and known surface magnetization characteristics to quantify and remove the surface contribution, thereby transforming the surface deterioration from a source of error into a controlled variable that enables accurate bulk property measurement.
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 accurate determination of permanent magnet characteristics by compensating for measurement errors caused by surface deterioration, even with small sample sizes, ensuring precise magnetization measurements.
Implementation Method 1
calculate magnetization of an inner part of each of the samples based on the acquired magnetization curve data and shape parameter of the sample by using a model representing magnetization of the object by separating the magnetization of the object into a magnetization component of a surface part and a magnetization component of an inner part of the object in accordance with a volume ratio between the surface part and the inner part of the object
Data Source
AI summary
A measurement apparatus includes: a memory; and a processor coupled to the memory and configured to: acquire, for each of two samples which are objects made of a same material, have different sizes, and have similar shapes, magnetization curve data measured for the sample and a shape parameter including a dimension of the sample; calculate magnetization of an inner part of each of the samples based on the acquired magnetization curve data and shape parameter of the sample by using a model representing magnetization of the object by separating the magnetization of the object into a magnetization component of a surface part and a magnetization component of an inner part of the object in accordance with a volume ratio between the surface part and the inner part of the object; and output the calculated result.