On the generator, he thought, not magnet (permanent magnet), and the electromagnet, can make magnetic strengthen, so have a powerful electric current.Siemens electric magnets instead of the principle of permanent magnet generator is core of electromagnet when no current, there is still a weak magnetism.When rotating coil, make use of this weak remanent magnetization current, and then return to the electromagnet, enhanced its magnetic force, so can produce strong magnetic magnet.Then, Siemens investigating the electromagnet generator.Soon they produced this new type of generator, it can produce pique generator is far from being compared by the strong current.
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