| 摘要 |
<p>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 gap between stator poles, within which the rotor rotates. One extension is disposed forwardly into the air gap, while the other extension is disposed rearwardly out of the air gap. The extensions cause the rotor to reside in a magnetic detent disposition relative to the stator arrangement when no current flows in the stator winding and the stepped or skewed disposition of the extensions at the a r gap influences the rotor to move unidirectionally through stepped increments upon each energization of the winding.</p> |
