Magnetic coupling, do you understand clearly?

Both are commonly used in magnetic pumps. The weak magnet is also called ferrite magnet, and the strong magnet is called NdFeB magnet.

First of all, let me introduce ferrite, which is a common black magnet, which is widely used in earphones, speakers, permanent magnet motors and other fields, and of course our magnetic pump. The surface magnetic energy product (the value of high and low magnetic properties) of ferrite magnets can generally reach 12000-16000Gs after saturation magnetization. The theoretical temperature resistance is 250°C, the magnetism will demagnetize in a curve at high temperature, and the magnetism can be completely restored when the temperature is lowered. Compared with other magnetic materials, the price has a great advantage, but due to the limitation of the surface magnetic energy product, it cannot be used in a wider range of industries. Therefore, the magnetic pump made of ferrite magnetic steel has a great advantage in price compared with the strong magnetic magnetic pump, but it is not competent when transporting high-density media. And due to the limitation of the curve demagnetization characteristics of the magnet, the magnetism fades more seriously after exceeding 100°C, and the phenomenon of internal and external magnetic slippage is prone to occur. Therefore, the high temperature field is also limited.

Let me introduce the NdFeB magnet again. This kind of magnet is called "Magnetic King". formula, the magnetic energy product can be further improved. The NdFeB magnets introduced here are brand 38SH, which is also the most used magnets. Its maximum use temperature is 150°C, and with the improvement of the formula, the maximum use temperature can reach 200°C. When the use temperature reaches the limit, the demagnetization curve of NdFeB shows a collapse, and it will fade to 0 instantly at a temperature point, which can be said to be very sensitive to temperature. The price of NdFeB will be much higher than that of ferrite, but the magnetism it can provide is beyond the reach of ferrite, so NdFeB magnetic materials will have a broader application space and market in the future.