Patent ID: 11909347
Assignee: SEIKO WATCH KABUSHIKI KAISHA
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A stepping motor control device comprising:
a stepping motor comprising a coil that is energized by a driving pulse to rotate a rotor that rotates a hand;
a control unit configured to output the driving pulse and a swinging pulse for swinging the rotor to the stepping motor in such a manner that the swinging pulse precedes the driving pulse without a replicated swinging pulse having a voltage and a polarity of the swinging pulse applied between the swinging pulse and the driving pulse;
a voltage detecting unit configured to detect an induced voltage generated in the coil by swinging of the rotor caused by application of the swinging pulse to the stepping motor; and
a determining unit configured to determine a mechanical load received by the rotor, based on the induced voltage detected by the voltage detecting unit.