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Introduction of the Magnet

Introduction of the Magnet

It is very important for enterprises to understand various magnetic application, so as to make full use of the characteristics of different magnets to better improve the product performance.

1. The history of magnet

At present, there are  two kinds of magnets that are most widely used: ferrite magnets and NdFeB magnets. NdFeB magnets were invented by Sumitomo Corporation in Japan in 1980s. Ferrite magnets were invented by Philips company in the Netherlands in 1940s and 1950s. So far, the technology of these two magnets has made a giant leap forward, and now is still improving to produce magnets that can produce stronger magnetic field and make performance more stable.

2.  The composition of the magnet

Taking ferrite and NdFeB magnets for example. The main raw material of ferrite magnet is ferroferric oxide, plus some other metals. The main composition of NdFeB are the three chemical elements in its name: neodymium, iron and boron. Among them, neodymium is a rare earth element, so NdFeB magnets are sometimes called rare earth magnets.

3.  Magnet type

Classification by shapes: square magnet, tile magnet, special-shaped magnet, ring magnet and circular magnet.

 

Classification by elements contained in magnets: samarium cobalt magnet, NdFeB magnet, ferrite magnet, aluminum nickel cobalt magnet, iron chromium cobalt magnet, rubber magnet and plastic magnet.

 

Classification by industry and magnet application: magnetic assembly, motor magnet, etc.

 

Magnets can be divided into  permanent magnets and a soft magnets. A permanent magnet is added up with strong magnetic field to make the spin of the magnetic substance is aligned with the angular momentum of the electron in a fixed direction. The soft magnet is added up with electricity (which is also a method of adding magnetic force), when the electricity is removed, the soft magnet will gradually lose its magnetism.

4.  The application and physical process of magnets

Application: 

Magnet is widely used in industry, medicine, astronomy, military and other trades and professions.

 

Physical process:

1.Compass;

2. Attract light and small objects;

3. Electromagnet can be used as electromagnetic relay;

4. Motor;

5. Generator;

6. Electroacoustics;

7. Magnetic therapy;

8. Magnetic levitation;

9. Magnetic resonance imaging.

 

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