What are Some Uses for Industrial Magnets?

The composition of the magnet is atoms such as iron, cobalt, nickel, etc. The internal structure of the atom is relatively special, and it has magnetic moment itself. Magnets can generate magnetic fields and have the property of attracting ferromagnetic substances such as iron, nickel, and cobalt.

Magnets are not invented by man, they are natural

1822, French physicist

Soft magnetics include silicon steel sheets and soft magnetic cores; hard magnetics include aluminum nickel cobalt, samarium cobalt, ferrites, and neodymium iron boron. Among them, the most expensive is samarium cobalt steel, and the cheapest is ferrite magnetic steel. The highest performance is NdFeB magnetic steel, but the most stable performance, temperature

Is there a 100% perfect spherical magnet in the physical world? If so, where is the NS pole of the spherical magnet? If NS is the two ends of its diameter, but the sphere has countless diameters, why are the ends of other diameters not NS poles?

Application in traditional industry

Talking about the magnetic source of magnetic materials,

raw material

The main raw materials of NdFeB magnets are: rare earth metals

Maglev train application

Rumor: Tin foil and magnets can generate electricity? The guy made a perpetual motion machine, which can light up a big light bulb after startup ^[7] .

Truth: Perpetual motion does not exist ^[7] .

Apply some unknown mucus on the shiny "tin foil", connect the wires, lay a layer of paper, put another piece of tin foil, apply mucus, connect the wires, and then roll it up to provide electricity. This device can drive toy motors, light LED bulbs, and do many other things. Now there are many similar videos on the Internet, some just say "tin foil and magnet can generate electricity", and some also add a "perpetual motion" gimmick. In fact, this is a common "word", or scam, to increase the number of clicks on the video ^[7] .

It looks amazing, but it's not worth the money: these videos are just a chemical battery. Two different metals are placed in a chemical solution to form a chemical battery, which converts chemical energy into electrical energy. Lead-acid batteries often used in daily life are chemical batteries. In this type of video, "tin foil" and "lead wire" are different metals, and the applied mucus acts as an electrolyte. Together they form a chemical battery, which can then drive a toy motor and light up an LED bulb. ^[7] .

The magnet may be a magnetic field to move the current-carrying coil, or it may just be a decoration (some toy motors can be moved by turning on the power). The current required to light the LED is small, and the current required by the toy motor should not be large. A simple chemical battery is enough. Even if the current is not enough, he can completely do something, such as changing a dry battery. (It is now easy to do this kind of hands and feet in the video.) For ordinary people, the magic of live performance can deceive people, I know that it is fake, but it is difficult to see where he is playing tricks. ^[7]

As far as perpetual motion is concerned, that doesn't exist-perpetual motion is a gimmick used to increase clicks. China's nine-year compulsory education and science popularization have made most people aware that perpetual motion is impossible because it violates the law of conservation of energy. However, adding the word "perpetual motion" to the title is still very eye-catching ^[7] .