drawer electromagnet

Electromagnet magnetic energy is converted into electrical energy stuff, according to the sound of the magnetic field generated by the coil is energized made of the principle, in fact, before this discovery Auster energized conductors can produce

Generated magnetic systems, because the magnetic field generated is weak, but later found energized coil to produce a magnetic field. In order to increase the coil of his middle with a magnetic core. Thereby obtaining a

The device is called the electromagnet. Mainly used for electrical control and found ferromagnetic material, such as old mine detectors.
 
Solenoid with internal core called electromagnets. When inserted into the core inside the solenoid is energized, the solenoid is energized the magnetic core magnetization. Magnetized core also

Into a magnet, so that the two magnetic fields overlap each other, so that a magnetic solenoid greatly enhanced. For the electromagnet magnetic stronger core system usually

Into a horseshoe. But note that the coil wound on the core horseshoe opposite, while clockwise to counter-clockwise on the other side. If around the same two coils on the core magnetization for

Using the offset each other, so that no significant magnetic core. In addition, the electromagnet with a soft iron core to do, rather than using steel to do. Otherwise, once the steel is magnetized, it will maintain long-term

Drawer magnets  and not demagnetized, then the strength of the magnetic current can not be used to control the size, and lose the advantages of the electromagnet should be.