N ncej thiab S ncej ntawm cov hlau nplaum yog teem ua ke.Ib tug N ncej thiab ib tug ncej yog hu ua ob tug ncej, thiab cov motors muaj peev xwm muaj ob tug ncej.Cov hlau nplaum yog siv nrog rau txhuas nickel cobalt hlau nplaum ruaj khov, ferrite ruaj khov hlau nplaum thiab cov hlau nplaum tsis tshua muaj hauv ntiaj teb (xws li samarium cobalt cov hlau nplaum ruaj khov thiab neodymium hlau boron cov hlau nplaum ruaj khov).Cov kev taw qhia magnetization yog muab faib ua parallel magnetization thiab radial magnetization.