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Magnetic types of powerful magnets and their applications in solenoid valves

When applied to the solenoid valve, if it is found that the solenoid valve is not working, you can use an electric meter to measure the ground rent value between the inserts. If the resistance value shows infinity, it may be an internal short circuit. If the resistance value is very small, There is a short circuit inside. At this time, the coil needs to be replaced. In fact, whether it is a short-circuit phenomenon or a short-circuit phenomenon, it is caused by the overheating of the coil. Therefore, during the working process, try to reduce the heat dissipation of the solenoid valve and reduce the power-on time. You can also use tools such as powerful magnets, which require a lot of suction.

Magnetic types of strong magnets:

In the absence of an external magnetic field, the exchange of electrons or other interactions between adjacent atoms in the magnetic domain occurs. After their magnetic moments overcome the influence of thermal motion, the strong magnets are in an orderly arrangement state of partial cancellation, so that there is a phenomenon of combined magnetic moment . When an external magnetic field is applied, the change of its magnetization with the external magnetic field is similar to that of ferromagnetic substances. Ferrimagnetism and antiferromagnetism have the same physical essence, but the anti-parallel spin magnetic moments in ferrimagnets are not equal in size, so there are partially canceled spontaneous magnetic moments, similar to ferromagnets. Ferrites are mostly ferrimagnets.

Diamagnetism is that the electron magnetic moments in the atoms of some substances cancel each other out, and the combined magnetic moment is zero. However, when the magnetic steel is subjected to an external magnetic field, the orbital motion of the electrons will change, and a small combined magnetic moment will be generated in the opposite direction to the external magnetic field. The magnetic susceptibility of a strong magnet, which represents the magnetism of a substance, becomes a very small negative number (quantity). Magnetic susceptibility is the ratio of the combined magnetic moment (called magnetization) of a substance under the action of an external magnetic field to the magnetic field strength, with the symbol κ. Generally, the magnetic susceptibility of diamagnetic (proper) substances is about negative one millionth (-10-6).

The magnetic susceptibility of paramagnetic substances is positive, which is 1 to 3 magnitudes larger than that of diamagnetism, X is about 10-5 to 10-3, and obeys Curie’s law or Curie-Weiss law. When there are ions, atoms or molecules with unpaired electrons in strong magnets, there are spin angular momentum and orbital angular momentum of electrons, and there are also spin magnetic moments and orbital magnetic moments. Under the action of an external magnetic field, the originally disordered magnetic moments will be oriented, thus showing paramagnetism.