Magnet development in 1822, the French physicist Arago and Lussac found that when the current through the winding which has iron, which enables winding of the iron magnetic magnet. This is actually the initial discovery of the principle of the electromagnet. 1823, Sturgeon also did a similar experiment: He is not in a U-shaped magnet rod iron bars around the 18 laps bare copper ferrite permanent magnet, when copper and voltaic cell is turned When, around the U-shaped iron bars of copper coils that produce a dense magnetic field, thus making a U-shaped piece of iron bar into a "magnet." This magnet permanent magnet magnetic energy than the energy amplification times, it can pick up more than 20 times its weight of iron, and when the power is turned off, U-iron iron bar on what it could not suck soft rubber magnet, again become an ordinary iron bar. Sturgeon electromagnet invention, so that people see the electrical energy into magnetic energy of a bright future for this invention quickly spread in the United Kingdom, the United States and Western Europe, some coastal countries. 1829, US electricity scientist Henry Sturgeon electromagnet device made some innovations, wires instead of bare copper wire, copper wire and therefore do not have to worry about being too close and short circuit. Due to the wire with the insulation layer magnet, they can be wound tightly around the enclosure together, due to the more intensive the coil, the stronger the magnetic field is generated, thus greatly improving the ability to convert electrical energy into magnetic energy. To 1831, Henry trial out an update of the electromagnet, although its size is not large, but it can pick up the one-ton iron. Electromagnet invention also makes the generator power has been greatly improved. History Fest electromagnet gold (Sturgeon) electromagnet. AD 1825, Englishman William Stewart Kim (William Sturgeon, 1783 年 -1850 years) will have a current through a wire wound on an insulating rod, invented the electromagnet. American physicist Joseph Henry (Joseph Henry 1797 年 -1878 years) ferrite permanent magnet, in the soft core coil winding intensive After learning the news, the use of current small battery powered up, will be able to pick up a ton of iron. Powerful magnets magnet manufacturers _ _ Guangdong Xin Tong new magnetic provided by the Dongguan City, Tong Xin magnetic Limited. Xin Tong, Dongguan City, the new magnetic Limited (www.dgxtxmagnet.com/) strong, credible, in Dongguan, Guangdong magnetic materials industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the new Tong Xin magnetic and you hand into the brilliant, for a better future!