Sintered NdFeB permanent magnet materials have excellent magnetic properties and are widely used in electronics, electric machinery, medical equipment, toys, packaging, hardware machinery, aerospace and other fields. Commonly used in permanent magnet motor, speaker, magnetic separation Machines, computer disk drives, magnetic resonance imaging equipment, and more.
The earphone speaker is also called a driver, and is also habitually called a dynamic speaker. Its design requirements must meet the needs of small caliber, light weight, otherwise it can not be installed to the ear shell.
Therefore, the internal parts need to be light and can not damage the performance. NdFeB permanent magnets have become the preferred magnet material, which has a very high magnetic density, up to 7-14 times that of ferrite, a common earphone. Iron-boron magnets can easily absorb objects that are several times their own weight.
