(rotor magnet) has two kinds of structures, saying outer rotor and inner rotor. The inner rotor rotates by the steel core in the center of the motor, and outer rotor rotaes by the housing of the motor. The magnetic rotors for permanent magnetic brushless DC motors are consisted of high remanence(Br) & energy product(BH) permanent magnets being glued outside the steel core of the motor. These permanent magnets can be NdFeB magnets, ferrite magnets, Alnico magnets and SmCo magnets. The core and housing can be steel, stainless steel or brass.