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Method for detecting magnetization direction of unmagnetized anisotropic magnetic steel

A technology of magnetic anisotropy and magnetization direction, which is applied in the field of detecting the magnetization direction of anisotropic magnetic steel, can solve the problems of low detection degree, high cost, and only random inspection, etc., and achieve high detection degree, low cost, and detection high efficiency effect

Active Publication Date: 2016-09-21
NINGBO YUNSHENG +4
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Problems solved by technology

However, the above two methods have the following problems: 1. The efficiency of manual detection is low. When targeting mass production, only random inspection can be performed, and full inspection is not possible, and the detection degree is low; Demagnetization, deplating and rework production process, the cost is high

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0017] Embodiment: a kind of method that detects the magnetization direction of unmagnetized anisotropic magnetic steel comprises the following steps:

[0018] ①Set the probe of the eddy current tester at (0.05+h)mm~(0.5+h)mm above the testing platform, and the probe is perpendicular to the testing platform, where h represents the thickness of the magnetic steel to be tested;

[0019] ②Set the detection area on the detection platform. When the magnetic steel is located in the detection area, the projection of the probe on the upper surface of the magnetic steel is located at the center of the upper surface of the magnetic steel;

[0020] ③ Select an unmagnetized anisotropic magnet with the same specification and correct magnetization direction as the first standard magnet, place the first standard magnet in the detection area, and use an eddy current detector to detect the first standard magnet The reactance and resistance, the reactance is X1, the resistance is R1;

[0021] ...

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Abstract

The invention discloses a method for detecting the magnetization direction of an unmagnetized anisotropic magnet. In the method, an unmagnetized anisotropic magnet with the same specification as the magnet to be tested and with the correct magnetization direction is selected as the first standard magnet and The unmagnetized anisotropic magnet with the same specification as the magnet to be tested has an incorrect magnetization direction as the second standard magnet, and the reactance and resistance are detected by an eddy current detector, and then the resistance of the magnet is taken as the abscissa and the reactance of the magnet. Make the impedance plane diagram of the magnetic steel for the ordinate, and then delineate an elliptical area in the impedance plane diagram as the qualified area of ​​the magnetization direction according to the position of the first standard magnetic steel marked in the impedance plane diagram and the position of the second standard magnetic steel, which will The detection of the magnetization direction of the magnetic steel is converted into the detection of the position of the magnetic steel in the impedance plane diagram; the advantage is that the continuous automatic detection of the magnetic steel in a non-magnetic environment is realized, the detection efficiency is high, the cost is low, and large batches can be realized Full inspection of production, high degree of detection and detection.

Description

technical field [0001] The invention relates to a method for detecting the magnetization direction of anisotropic magnetic steel, in particular to a method for detecting the magnetization direction of unmagnetized anisotropic magnetic steel. Background technique [0002] Magnetic steel (also known as permanent magnet) has excellent magnetic properties and has been widely used in electronics, electric machinery, medical equipment, automobiles, aerospace and other fields. For the anisotropic magnetic steel, its magnetization direction (ie, the orientation direction of the magnetic field) is the key characteristic of the product, and the wrong magnetization direction of the magnetic steel will directly lead to the failure of the magnetic steel product. [0003] At present, when the production of magnetic steel is completed and enters the sales field, due to the demand for subsequent application products (such as motors), the magnetic steel is not magnetized in many cases. In t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/12
Inventor 郑卿王云龙樊华林苗
Owner NINGBO YUNSHENG
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