In a lowmagnetic field, the choice of the magnetic material can affect the good field region, the spectra in which the magnets can work normally.
计算证明在低场区的电磁铁中，不同的磁铁材料对磁铁工作的好场区范围有很大的影响。
2
Making use of permanent magneticmaterial as the vibration power, a permanent magnetic vibrating drill machine is developed, which is simple in structure, convenient in operation and low in price.
研制了一种永磁振动钻床，采用永磁材料作为振源，其结构简单，操作方便，价格低廉。
3
Before regular use of electro-magnet of the magneticmaterial Alnico, aluminum nickel and cobalt is very low coercivity, high magnetic permeability, however, it is easy to demagnetization.