Creation of powerful electromagnets is a difficult technical task. In the industry as, actually, and in everyday life the magnets of big power are necessary. In a number of the states already even trains work at a magnetic pillow. Cars with the electromagnetic engine massively will appear also at us under the Yo-mobile brand soon. But how magnets of big power are created?
Instruction
1. At once It should be noted that magnets are divided into several classes. There are permanent magnets are, as a rule, the pieces of a certain metal and alloy having a certain magnetism without foreign influence. And there are also electromagnets. These are technical devices in which magnetic field is created by carrying out electric current via special coils.
2. From permanent magnets powerful it is possible to refer to category only neodymium. At rather small size, they have just amazing magnetic characteristics. First, they lose the magnetic properties only for 1% in hundred years. Secondly, at rather small sizes, they have huge magnetic force. Neodymium magnets artificially are made. Neodymium is necessary for their creation rare-earth metal. Also iron and a pine forest is used. The received alloy is magnetized in magnetic field. As a result, the neodymium magnet is ready.
3. In the industry powerful electromagnets are everywhere applied. Their design is far more difficult, than at permanent magnets. The coil consisting of a winding from a copper wire and also the iron core is necessary for creation of a powerful electromagnet. Magnet force in this case depends only at most current carried via coils and also quantities of rounds of a wire on a winding. It should be noted that at a certain current the magnetization of the iron core is exposed to saturation. Therefore the most powerful industrial magnets are produced without it. Instead still some number of rounds of a wire is added. In the majority powerful industrial magnets with the iron core the number of rounds of a wire seldom exceeds ten thousand on meter, and the used current – two amperes.