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Method for measuring parameter of magnetic characteristic of permanent magnet

A measurement method and permanent magnet technology, applied in the direction of magnetic performance measurement, etc., can solve the problems of remanence and coercive force error, and achieve the effect of improving efficiency and accuracy and reducing the amount of data storage.

Inactive Publication Date: 2009-10-21
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method uses empirical formulas when calculating the magnetic moment by using the electromotive force, which may bring large errors to the final remanence and coercive force.

Method used

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  • Method for measuring parameter of magnetic characteristic of permanent magnet
  • Method for measuring parameter of magnetic characteristic of permanent magnet
  • Method for measuring parameter of magnetic characteristic of permanent magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Combining figure 2 , the measuring method of a kind of permanent magnet magnetic characteristic parameter of the present invention, measuring method step is as follows:

[0029] Step 1: Put the magnetized permanent magnet in the magnetic field measurement system, and measure the magnetic induction intensity vector value outside the permanent magnet;

[0030] Step 2: Implement the Douglas-Peucker data compression algorithm on the host computer with Visual C++6.0 software programming, perform the data compression algorithm, and extract the characteristic points of the magnetic induction intensity vector value outside the permanent magnet;

[0031] Step 3: Use Visual C++6.0 software to call Flux software to build a finite element model. The specific steps for building a model are:

[0032] (1) Establish the geometric model of the permanent magnet, and establish the geometric model from point to line, line to surface, surface to body;

[0033] (2) Subnetting t...

Embodiment 2

[0040] Example 2: Combining figure 1 , figure 2 , image 3 , the measuring method of a kind of permanent magnet magnetic characteristic parameter of the present invention, concrete measuring example is as follows:

[0041] The material of the selected permanent magnet is FeCrCo, the size is 60mm×16.2mm×3.4mm, and the shape of the sample is cuboid.

[0042] The first step is to obtain the magnetic induction value outside the permanent magnet through the magnetic field measurement system. In this example, the overall structure of the magnetic field measurement system used is as follows image 3 As shown, in this system, the stepper motor is controlled by the ARM microprocessor to move within the required measurement range of the permanent magnet, and the stepper motor drives the three Hall probes fixed on the measurement arm to also be within the required measurement range Moving, through the three Hall probes, the components of the magnetic induction intensity at a certain ...

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Abstract

The invention aims to provide a method for measuring a parameter of magnetic characteristic of a permanent magnet, which adopts a data compression algorithm to carry out characteristic point extraction, redundant data deletion and data storage reduction on a magnetic strength value acquired from the outside of the permanent magnet. The spatial magnetic strength value outside the permanent magnet can be acquired through a magnetic field measurement system; the characteristic point is extracted by the data compression algorithm; a three-dimensional finite element model of the permanent magnet is established; remanence and coercive force are initially set; an emulation value of the magnetic strength of the characteristic point is obtained through emulation calculation; the remanence and the coercive force are constantly corrected by comparing the emulation value with a measured value until the difference of the emulation value and the measured value is smaller than a certain error range, thereby obtaining the remanence and the coercive force of the permanent magnet. The whole flow is realized through a software system. The invention provides a method for measuring the parameter of the aged magnetic characteristic, and has the characteristics of high automation degree and strong flexibility.

Description

(1) Technical field [0001] The invention relates to electromagnetic measurement technology, in particular to a method for measuring magnetic characteristic parameters of permanent magnets. (2) Background technology [0002] At present, in the field of electrical engineering, permanent magnets are used more and more widely, and more and more electrical products contain permanent magnets inside. As a key component, the magnetic properties of the permanent magnet material directly affect the performance of the product. Magnetic measurement has very practical significance in engineering technology. It makes it possible to evaluate the performance of various magnetic materials and their finished products. Remanence and coercive force are two important parameters to measure the magnetic properties of permanent magnet materials. Generally speaking, as a permanent magnet used as a magnetic field, it is desirable to have a large remanence and coercive force, so that the permanent ...

Claims

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Application Information

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IPC IPC(8): G01R33/12
Inventor 翟国富王臣杨文英申泽军李孝臣李冰
Owner HARBIN INST OF TECH
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