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The invention of electromagnets also greatly improved the power

by AOMag | post a comment

Electromagnet introduction
A device with a core inside that uses a current-carrying coil to make it magnetic like a magnet is called an electromagnet, and is usually formed into a strip or a shoe shape. The iron core should be made of soft iron or silicon steel that is easily magnetized and easily disappears. Such an electromagnet is magnetic when energized, and disappears after power is turned off.
Electromagnets have many advantages: the presence or absence of electromagnets can be controlled by on and off currents. The size of the magnet can be controlled by the strength of the current or the number of turns of the coil. Electromagnets have an extremely wide range of applications in everyday life.
Electromagnets are an application of current magnetic effects (electro-magnetic) and are closely related to life, such as electromagnetic relays, electromagnetic cranes, maglev trains, etc.
Invention of electromagnet
In 1822, French physicists Arago and Lussack discovered that when current was passed through a winding with iron, it could magnetize the iron in the winding. This is actually the initial discovery of the electromagnet principle. In 1823, Sturgeon did a similar experiment: he wrapped 18 turns of bare copper wire on a U-shaped iron bar that was not a magnet bar. When the copper wire was connected to the voltaic cell, it was wound around U. The copper coil on the iron rod creates a dense magnetic field, which turns the U-shaped iron rod into an "electromagnet". The magnetic energy on this electromagnet is much larger than that of the permanent magnet. It can suck up the iron block 20 times heavier. When the power is cut off, the U-shaped iron bar can't hold any iron. An ordinary iron rod.
The invention of Sterling's electromagnets led to the bright future of converting electrical energy into magnetic energy, a invention that soon spread in the United Kingdom, the United States, and some coastal countries in Western Europe.
In 1829, the American electrician Henry made some innovations on the Sterling electromagnet device. The insulated wires replaced the bare copper wires, so there was no need to worry about being short-circuited by the copper wires being too close. Since the wires have an insulating layer, they can be tightly wound together in a circle. The denser the coil, the stronger the generated magnetic field, which greatly improves the ability to convert electrical energy into magnetic energy. By 1831, Henry had produced a newer electromagnet. Although it was not large, it could suck up a ton of iron.
The invention of the electromagnet also greatly improved the power of the generator.
Electromagnet classification
Electromagnets can be divided into two types: DC electromagnets and AC electromagnets. If the electromagnets are divided according to the purpose, they can be mainly divided into the following five types:
(1) Traction electromagnet - mainly used to pull mechanical devices, open or close various valves to perform automatic control tasks.
(2) Lifting electromagnets - used as lifting devices to lift ferromagnetic materials such as steel ingots, steel and iron sand.
(3) Brake electromagnet - mainly used to brake the motor to achieve accurate parking.
(4) Electromagnetic systems of automatic electrical appliances - such as electromagnetic systems of electromagnetic relays and contactors, electromagnetic tripping devices of automatic switches, and operating electromagnets.
(5) Electromagnets for other purposes - such as electromagnetic chucks for grinding machines and electromagnetic vibrators.





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