The permanent magnet made from what? _
Use can response on magnetic field and the speed switch its soft magnet magnetization. Permalloy core in electronic products, such as broadband gap semiconductors such as silicon carbide to convert the power electronics and motor controller more productively, but need to develop under the high frequency response of the soft magnet. Iron with high magnetic permeability. This means that, in order to get the same magnetic flux and hollow inductor, it may be much smaller. This is the essence of the transformer Produce magnetic flux, the use of magnetic flux in another coil induction current. Soft iron called core is placed inside the solenoid because, compare the strength of the magnetic field becomes large iron ore by induced magnetization. As a result, the electromagnet by the soft iron core is wrapped around the long coil of insulated copper wire. Iron core loss of magnetization. The permanent magnet made from what? It is made of ferromagnetic materials and magnetized by the strong external magnetic field. Shut down after the external magnetic field, using a magnetic hard material will keep some of its magnetization. Iron with high magnetic permeability. This means that, in order to get the same magnetic flux and hollow inductor, it may be much smaller.