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A demagnetization method based on the trend monitoring of bh curve asymmetry change based on reconstruction

A technology with changing trend and asymmetry, applied in the field of ferromagnetics, can solve the problems such as failure to provide calculation methods and difficulty in finding and positioning the starting point of the magnetization curve.

Active Publication Date: 2015-12-02
卢庆港
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  • Claims
  • Application Information

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Problems solved by technology

In this method, it is difficult to find and locate the starting point of the magnetization curve, and the corresponding calculation method has not been provided in the literature

Method used

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  • A demagnetization method based on the trend monitoring of bh curve asymmetry change based on reconstruction
  • A demagnetization method based on the trend monitoring of bh curve asymmetry change based on reconstruction
  • A demagnetization method based on the trend monitoring of bh curve asymmetry change based on reconstruction

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Embodiment Construction

[0038] According to the magnetic domain theory of ferromagnetism, the demagnetization process is usually divided into two steps:

[0039] A. Change the original remanence state

[0040] Apply an external alternating magnetic field, the amplitude of which is greater than the residual magnetic intensity, so that it can re-magnetize the material, change the direction of the magnetic domain, change the original residual magnetic state, and the hysteresis loop gradually returns to a symmetrical state;

[0041] B. The hysteresis loop shrinks to the origin

[0042] Gradually reduce the intensity of the external alternating magnetic field, the hysteresis loop gradually shrinks until it finally shrinks to the origin, the direction of the magnetic domain of the ferromagnetic material is discretely distributed, the overall magnetic neutrality, and no residual magnetism.

[0043] Aiming at the problems of demagnetization process monitoring and demagnetization effect inspection, the prese...

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Abstract

The invention discloses a method for monitoring the demagnetization process and judging the demagnetization effect. The equivalent BH curve of the ferromagnetic material in the demagnetization coil is reconstructed by using voltage and current. When the BH curve enters the unilateral saturation region, the calculation method of the asymmetry of the BH curve is defined, and the demagnetization state is detected according to the asymmetry of the BH curve and the change trend of the voltage. The demagnetization process monitoring of surface magnetization equipment can also be extended to other general demagnetization processes, and also provides a solution for the automatic operation of the demagnetization process.

Description

technical field [0001] The invention relates to a method for monitoring the demagnetization process and judging the demagnetization effect, belonging to the technical field of ferromagnetism. Background technique [0002] In modern industrial technology, ferromagnetic materials are widely used in various products. Ferromagnetic materials are easy to form residual magnetism after magnetization, which affects subsequent precision processing and equipment operation. For electrical equipment, iron cores as magnetic materials The existence of residual magnetism not only affects the accuracy of measurement and the reliable operation of relay protection equipment, but also affects the stability of the power grid and the service life of equipment. [0003] "The Influence of Core Remanence on the Performance of Current Transformers" (Relay [J] 2007 No. 22) points out that current transformers in power systems generally have remanence, and once remanence occurs, it will not disappear ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/12
Inventor 卢庆港
Owner 卢庆港