2013年8月4日星期日

the electromagnet works

Electromagnet
With internal core, the use of a current through a coil it like a magnet with a magnetic device called a solenoid, usually made from bar or horseshoe. Easy to use core

Magnetization, magnetic and easy to disappear to soft iron or silicon steel making. Such a magnetic solenoid when energized, power outages after disappeared. Electromagnet has many advantages: Electromagnetic

Presence or absence of ferromagnetism can be used to pass, off current control. The size of the magnetic strength of the current can be used or the number of turns to control. magnetic systems Electromagnets in everyday life has an extremely

Wide range of applications. Electromagnet is a current magnetic effect (electrophysiological magnetic) of an application, and life are closely connected, such as electromagnetic relays, magnetic crane, magnetic levitation train

And so on.

The invention of the electromagnet

1822, French physicist Arago and Gay-Lussac found that when the current through the winding which has iron, it can make the iron wire magnetized. This is actually the power-

Magnet principle was originally discovered. 1823, Sturgeon also did a similar experiment: He is not in a U-shaped iron bar magnet stick on bare copper around the 18 laps, when

Copper and voltaic cell is turned on, around the U-shaped iron rods the copper coils which produce a magnetic field intensity, so that the U-shaped iron rod into a piece of "electromagnet." Such electrical

Magnetic energy than the permanent magnet can be big release times, it can pick up more than 20 times its weight of iron, and when the power is cut off, U-shaped iron bar on what iron also suck live, re-

Become an ordinary iron bar.

Sturgeon electromagnet invented to make people see the magnetic energy to electrical energy into the bright future of this invention soon in the United Kingdom, the United States and some Western European countries biography of coastal

Sowing open.

1829, U.S. scientist Henry Sturgeon electricity electromagnet device made some innovations, insulated wire instead of bare copper wire, copper wire so do not worry about being too close to

The short circuit. As the wire with the insulation layer, they can be tightly wound together around the enclosure, the more intensive the coil, the stronger the magnetic field, so that a large

Large increase the capacity of magnetic energy into electrical energy. To 1831, Henry trial out an update electromagnet, although its volume is not large, but it can pick up a

Tons of iron.

The invention also enables the electromagnet generator power has been greatly improved.

Electromagnet Description: DC solenoid and electromagnet can be divided into two major types of AC solenoids. If in accordance with the purpose to divide the electromagnet can mainly be divided into the following five categories: (

1) traction magnet - pulling mechanism is mainly used to open or close the valves, in order to perform automatic control tasks. (2) lifting magnet - used as a lifting

Lifting device ingots, steel, iron ore and other ferromagnetic materials. (3) brake solenoid - mainly used for braking the motor in order to achieve accurate parking purposes.

(4) Automatic electrical electromagnetic system - such as electromagnetic relays and contactors electromagnetic system, automatic switch and operation of the electromagnetic solenoid release and so on. (5) Others

Way solenoid - such as grinder magnetic chuck and electromagnetic vibrator.


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