Development of an axial-gap spindle motor for computer hard disk drives using PCB winding and dual air gaps

This paper introduces the design and development of an axial-gap spindle motor using printed circuit board (PCB) winding and dual air gaps, which has the mechanical rigidity, high efficiency, and zero cogging torque required in a computer hard disk drive. Superior characteristics of the developed motor are experimentally compared with the conventional radial-gap spindle motor. It shows that the developed motor can be effectively used for various applications of a small precision motor with its manufacturing flexibility.