What is the purpose of magnets?

1. North and South;

2. Attracting light and small objects;

3. Electromagnet can be used as electromagnetic relay;

4. Motor;

5. Generator;

6. electroacoustic;

7. Magnetic therapy;

8. Magnetic levitation;

9. Nuclear magnetic resonance.

Second, the role of diet therapy

1. The magnet is salty and flat; Liver and kidney meridian; The quality of this town has declined.

2. It has the effects of calming the liver and suppressing yang, improving hearing and eyesight, calming the nerves and relieving asthma.

3. Indications are dizziness due to liver yang, palpitation and insomnia, blurred vision, tinnitus and deafness, and asthma due to kidney deficiency.

Third, industrial application.

1. Application of maglev train

Maglev train is a high-speed maglev train system with contactless electromagnetic levitation, guidance and drive system. Its speed can reach more than 500 kilometers per hour, making it the fastest ground passenger transport in the world today. It has the advantages of high speed, strong climbing ability, low energy consumption, low noise, safety and comfort, no oil consumption, less pollution and low price. And the overhead way is adopted, which occupies less cultivated land. Maglev train refers to the use of the basic principle of magnetic force to suspend these trains on the guide rail to replace the old steel wheels and track trains. Magnetic levitation technology uses electromagnetic force to lift the whole train car, get rid of annoying friction and unpleasant clang, and realize rapid "flight" without touching the ground and fuel.

Maglev train is the most fundamental breakthrough in railway technology since Stephenson's "rocket" steam locomotive came out about 200 years ago. Maglev train is a new thing today, but its theoretical preparation has a long history. The research of magnetic levitation technology originated in Germany. As early as 1922, German engineer Herman Qiangsuo put forward the principle of electromagnetic levitation, and applied for the patent of maglev train in 1934. After 1970s, with the increasing economic strength of the world's industrialized countries, Germany, Japan, the United States, Canada, France, Britain and other developed countries began to plan to develop magnetic levitation transportation systems to improve their transportation capacity and meet the needs of their economic development.

2. Application of NdFeB

The applications of NdFeB magnets in China are as follows. The applications in high-tech products account for 37%, such as magnetic resonance imaging, mobile phone vibration, hard disk drive voice coil (VCM), optical disk (DVD, CD-ROM) drive spindle, power tools, electric vehicles, variable frequency air conditioning motors and so on. Traditional middle and low-grade products account for 63%, such as audio equipment, magnetic adsorption equipment, magnetic separator, magnetizer and so on.