Abstract: The present invention relates to a motor having yokes concentrically arranged and a driving apparatus having the motor. More particularly, the present invention relates to a motor, in which armature metal cores having coils wound thereon and yokes having magnets attached thereto are arranged in multiple stages around a central shaft, and a driving apparatus having the motor. A motor having yokes concentrically arranged according to an aspect of the present invention comprises a rotor and a stator. The rotor has a plurality of cylindrical yokes arranged in multiple stages in a radial direction and a plurality of magnets respectively fixed to the yokes with polarities of the magnets alternated with each other in a circumferential direction. The stator has armature metal cores arranged to face the respective yokes and a plurality of armature coils wound on the armature cores to face the magnets.

Abstract: A rotor assembly includes a lamination and a hub. The hub includes an inner portion and an outer portion surrounding the inner portion and separated from it by an expansion gap. The rotor assembly also includes two or more connecting members coupling the inner portion to the outer portion, the connecting members having a first end and a second end.