Patent ID: 11906934
Assignee: SEIKO EPSON CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 9:
10. A watch motor control method for switching a drive current supplied to a coil of a watch motor to an ON state or an OFF state in accordance with a current value, and, when an ON time period, which is a duration of the ON state, or an OFF time period, which is a duration of the OFF state, is detected to meet a polarity switching condition, performing constant current control of switching a polarity of the drive current to perform step driving of a rotor, the method comprising:
executing the constant current control at a sampling cycle; and, detecting a sampling cycle setting condition, and changing the sampling cycle in at least two stages of a first cycle and a second cycle longer than the first cycle, in accordance with the detected sampling cycle setting condition.