Rotary driving device used for rotary actuator.

摘要

A rotary driving device is constituted by a pair of stator magnetic poles having end faces opposing through gaps; a rotor of magnetic material rotatably supported inside the stator magnetic pole pair, having two pole surfaces between two planes parallel with the axis of rotation; and an excitation coil of the stator magnetic pole pair. The positions of the gaps between the end faces of the stator magnetic pole pair along the circumferential direction are changed along the axial direction, thereby output and detent torques are obtained effectively and satisfactorily.