Stepping motor with stator pole extensions to provide magnetic detent

Abstract From the Canadian patent

A motor is driven in stepped fashion by a pulsed alternating output from an integrated co?nter circuit and a source of oscillation to drive a gear train of a clock in stepped increments. The motor includes a stator having a core with at least one pair of stator poles a winding coupled, to the core, and a rotor having permanently magnetized poles of alternately opposite polarity; while the oscillator includes a highly stable quartz crystal. The stepping motor is self starting within at least the second pulse applied across the winding and provides a unidirectional drive by provision and arrangement of a pair of extensions, one on each stator pole although on opposite sides, proximate an air …