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Reconstruction-based demagnetization method for monitoring changing trend of degree of asymmetry of BH curve

A changing trend and asymmetric technology, applied in the field of ferromagnetism, can solve the problems of difficulty in finding and locating the starting point of the magnetization curve, failure to provide calculation methods, etc.

Active Publication Date: 2013-12-11
卢庆港
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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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  • Reconstruction-based demagnetization method for monitoring changing trend of degree of asymmetry of BH curve
  • Reconstruction-based demagnetization method for monitoring changing trend of degree of asymmetry of BH curve
  • Reconstruction-based demagnetization method for monitoring changing trend of degree of asymmetry of BH curve

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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 a demagnetization process and judging a demagnetization effect. According to the method, an equivalent BH curve of a ferromagnetic material in a demagnetization coil is reconstructed by using voltage and current, a computation method of the degree of asymmetry of the BH curve is defined by means of analyzing macroscopic characteristics of the BH curve in different states on the basis of the characteristic that the BH curve enters a single-side saturation area when residual magnetism, and the demagnetization state is detected according to the degree of asymmetry of the BH curve and the change trend of the voltage. The method disclosed by the invention not only can be used for monitoring the magnetization process of equipment of which the surface magnetism cannot be directly measured by using a teslameter, but also can be applied to other universal demagnetization processes, and meanwhile can provide a solution for automatic operation of the demagnetization processes.

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) pointed out that current transformers in power systems generally have remanence, and once remanence occurs, it will not disappear...

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Application Information

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IPC IPC(8): G01R33/12
Inventor 卢庆港
Owner 卢庆港
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