Vibration reduction of a single-phase spindle motor with structural refinement

For adequate operations of those precision instruments like hard disc and digital video disc drives, the effects of rotating vibrations must be carefully considered in the design stage. In this paper, an axial-winding single-phase brush less DC motor is adopted to form the single-phase spindle motor for its lower cost and better capability of vibration reduction. With proper structure refinement, it is verified that the undesired vibrations and cogging torques of this motor design can be much reduced, and large axial force can be generated to adjust the operational axial displacement. Hence a refined single-phase spindle motor structure that can provide stable operations for related drive applications is thus provided.