Magnetic rotor, which is made from segment magnets glued to the inside or outside the steel sleeve, is a important part of motors. This motor part are widely used in stepping motors ,BLDC motors, PM motors and other motor application. 

The magnetic inner rotor is relative to the stator, it works inside.  The segment magnets are glued to the outside of steel sleeve. It located in the center of the stator and the entire motor. The primary advantage of an inner rotor construction is its ability to dissipate heat.