Folding with internal core

Folding with internal core, the use of electric current through a coil like a magnet with magnetic device called a solenoid (electromagnet), for example, usually made bar or horseshoe. Easy to use magnetic core, and easy to disappear magnetic soft iron or silicon to the system to do. Such a magnets neodymiumelectromagnet when energized, power disappear after, for example smco5, the electromagnet has an extremely wide range of applications in everyday life. Electromagnet invention also enables the generator power has been greatly improved