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

Claim 20:
21. A method for controlling a stepping motor that comprises a rotor that rotates a hand and a coil that generates a magnetic flux for rotating the rotor, the method comprising:
applying a swinging pulse to the stepping motor for swinging the rotor;
applying a driving pulse to the stepping motor to rotate the rotor, 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;
detecting an induced voltage generated in the coil by application of the swinging pulse to the stepping motor; and
determining a mechanical load received by the rotor, based on the detected induced voltage.