Method for detecting safe magnetic environment of magnet, and application thereof

A magnetic environment and magnet technology, applied in the direction of the size/direction of the magnetic field, can solve the problems of unclear surrounding environment, complex surrounding environment, inability to build models, etc., to avoid catastrophic consequences, accurate results, and easy operation.

Pending Publication Date: 2020-03-06
CHINA SPALLATION NEUTRON SOURCE SCI CENT +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The evaluation method generally adopts finite element simulation calculation, which is effective in most cases, but numerical simulation is not suitable for some special occasions, for example, the surrounding environment is too complicated to establish an effective model, or the surrounding environment is not Can't model when it's clear

Method used

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  • Method for detecting safe magnetic environment of magnet, and application thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0028] The China Spallation Neutron Source is equipped with a 9T superconducting magnet sample measurement system, which is planned to be installed in the sample cavity of the neutron spectrometer to provide a strong magnetic field environment for various samples. Although the sample chamber is made of non-magnetic aluminum alloy material, the sample stage and the surrounding operating platform are made of strong magnetic ferrite carbon steel, so it is very easy to be magnetized and reacts on the superconducting magnet. In order to prevent the superconducting magnet from being damage, this example carried out a force test on it.

[0029] In this example, the force threshold of the superconducting magnet sample measurement system to be tested is 50 kg force, and the weight of the magnet to be tested is 260 kg. For this reason, three sets of pressure sensors with a range of 200 kg are specially customized for this example to test the safe magnetic environment of the magnet to be...

Embodiment 2

[0037] In Embodiment 1, the longitudinal force of the magnet to be tested is calculated, but in reality, the force of the superconducting magnet is often very complicated; wherein, most of the force that causes damage to the superconducting coil of the superconducting magnet is the transverse force. Therefore, when evaluating the safe magnetic environment of the magnet to be tested, it is more accurate to decompose the force of the magnet to be tested into longitudinal force and lateral force. Therefore, in this example, the force change of each pressure sensor is calculated according to the method of Embodiment 1, the center of gravity displacement of the magnet to be tested is calculated by the method of torque, and the lateral force after the magnetic field is applied is calculated according to the center of gravity displacement. It can be understood that if the three pressure sensors are evenly arranged, in principle, the initial readings of the three pressure sensors and t...

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Abstract

The application discloses a method for detecting a safe magnetic environment of a magnet, and an application thereof. The method for detecting the safe magnetic environment of the magnet comprises thesteps of supporting a to-be-detected magnet by a pressure sensor; reading a value of the pressure sensor when no magnetic field is applied, and marking the value as N1; applying a magnetic field to the to-be-detected magnet, reading the value of the pressure sensor after the magnetic field is applied, marking the value as N2; calculating the stress on the to-be-detected magnet by the applied magnetic field that deltaN equals to N2 minus N1; gradually increasing the magnetic field, and regarding the corresponding applied magnetic field as the tolerated safety magnetic environment of the to-be-detected magnet when the DeltaN reaches a stress threshold of the to-be-detected magnet. Through the detection method disclosed by the application, the highest tolerated magnetic field of the magnet can be effectively detected, thereby preventing the magnet from being used under the highest tolerated magnetic field and avoiding the caused disastrous consequence. The detection method disclosed by the application is simple and easy to operate, clear in consequence, practical and reliable, and provides a scientific and feasible scheme for the use safety assessment of the magnet.

Description

technical field [0001] The present application relates to the field of magnet detection, in particular to a method for detecting a safe magnetic environment of a magnet and its application. Background technique [0002] With the continuous development of science and technology, people use more and more strong magnetic field magnets. While a strong field magnet provides a strong magnetic field, it is also subject to the reaction of surrounding objects due to magnetization. This reaction is sometimes so strong that it will affect the distribution of the magnetic field of the magnet and even damage the magnet itself. This damage is especially prominent for superconducting magnets. . [0003] Superconducting magnets are widely used in today's scientific research, and it is also a basic conditional device for studying the magnetic phase transition of matter. In order to study the physical behavior of substances in a strong magnetic field environment, multiple technical means ar...

Claims

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Application Information

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IPC IPC(8): G01R33/02
CPCG01R33/02
Inventor 罗万居童欣黄志强白波胡海韬袁宝
Owner CHINA SPALLATION NEUTRON SOURCE SCI CENT
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