Method for detecting magnetization direction of non-magnetized 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 detection, only sampling inspection, and high cost, and achieves high detection efficiency, high detection detection and cost. low effect

Active Publication Date: 2014-09-03
NINGBO YUNSHENG +4
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  • Application Information

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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
Comparison scheme
Effect test

Embodiment

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

[0018] ① Set the probe of the eddy current tester at (0.05+h) ~ (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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PUM

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Abstract

The invention discloses a method for detecting magnetization direction of non-magnetized anisotropic magnetic steel. According to the method, non-magnetized anisotropic magnetic steel which has correct magnetization direction and has the same specification with magnetic steel to be detected is used as first standard magnetic steel and non-magnetized anisotropic magnetic steel which has incorrect magnetization direction and has the same specification with the magnetic steel to be detected is used as second standard magnetic steel; reactance and resistance are respectively detected by the adoption of an eddy current inspection instrument; resistance of the magnetic steel is taken as a horizontal coordinate and reactance of the magnetic steel is taken as a vertical coordinate to make an impedance plane diagram of the magnetic steel; an oval area is delimited in the impedance plane diagram to be used as a magnetization direction qualified area according to a position marked as the first standard magnetic steel and a position marked as the second standard magnetic steel in the impedance plane diagram; and detection of magnetization direction of the magnetic steel is converted to detection of position of the magnetic steel in the impedance plane diagram. The method provided by the invention has advantages as follows: continuous automatic detection of the magnetic steel in a non-magnetic environment is realized; detection efficiency is high; costs are low; full inspection of mass production can be realized; and detectivity of the detection is high.

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 Applications(China)
IPC IPC(8): G01R33/12
Inventor 郑卿王云龙樊华林苗
Owner NINGBO YUNSHENG
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