Driving device, stepping motor driving method, program, and electronic timepiece

Patent metadata

Field	Value
Publication number	US-10416611-B2
Application number	US-201715440465-A
Country	US
Kind code	B2
Filing date	Feb 23, 2017
Priority date	Mar 11, 2016
Publication date	Sep 17, 2019
Grant date	Sep 17, 2019

Abstract

A driving device includes a stepping motor having a rotor, a coil for rotating the rotor, and a processor that drives the stepping motor. The processor generates a driving pulse for rotating the rotor of the stepping motor to a prescribed position, and outputs the driving pulse to the coil; and generates a rotation assistance pulse for rotating the rotor of the stepping motor at a prescribed speed, and outputs the rotation assistance pulse to the coil, after outputting the driving pulse but before EMF is produced by the rotation of the rotor of the stepping motor caused by the driving pulse.

First claim

What is claimed is:

1. A driving device, comprising:
a stepping motor including a rotor and a coil to rotate the rotor; and
a processor that drives the stepping motor,
wherein the processor:
generates a driving pulse for rotating the rotor of the stepping motor to a prescribed position, and outputs the driving pulse to the coil; and
after outputting the driving pulse but before said driving pulse causes electromotive force to be generated by the rotation of the rotor of the stepping motor, generates a rotation assistance pulse for rotating the rotor of the stepping motor at a prescribed speed.

2. The driving device according to claim 1 , wherein the processor:
determines whether or not the rotor of the stepping motor has rotated to the prescribed position; and
when it is determined that the rotor of the stepping motor has not rotated to the prescribed position, outputs a correction pulse for rotating the rotor to the prescribed position.

3. The driving device according to claim 2 , further comprising:
a temperature sensor,
wherein the processor:
stops the output of the rotation assistance pulse when it is determined that a temperature detected by the temperature sensor is greater than or equal to a prescribed temperature.

4. An electronic timepiece, comprising:
a hand indicating one of seconds, minutes, hours, a date, and a day of the week;
a wheel train mechanism that transmits power to the hand; and
the driving device according to claim 3 that drives the wheel train mechanism.

5. An electronic timepiece, comprising:
a hand indicating one of seconds, minutes, hours, a date, and a day of the week;
a wheel train mechanism that transmits power to the hand; and
the driving device according to claim 2 that drives the wheel train mechanism.

6. The driving device according to claim 1 , further comprising:
a temperature sensor,
wherein the processor:
stops the output of the rotation assistance pulse when it is determined that a temperature detected by the temperature sensor is greater than or equal to a prescribed temperature.

7. An electronic timepiece, comprising:
a hand indicating one of seconds, minutes, hours, a date, and a day of the week;
a wheel train mechanism that transmits power to the hand; and
the driving device according to claim 6 that drives the wheel train mechanism.

8. An electronic timepiece, comprising:
a hand indicating one of seconds, minutes, hours, a date, and a day of the week;
a wheel train mechanism that transmits power to the hand; and
the driving device according to claim 1 that drives the wheel train mechanism.

9. A method of driving a stepping motor, comprising:
outputting a driving pulse that rotates a rotor of the stepping motor to a prescribed position; and
after outputting the driving pulse but before said driving pulse causes electromotive force to be generated by the rotation of the rotor of the stepping motor, outputting a rotation assistance pulse for rotating the rotor of the stepping motor at a prescribed speed.

10. A non-transitory storage medium having stored therein instructions executable by a processor serving as a driving device that drives a stepping motor, the instructions causing the processor to perform the following:
outputting a driving pulse that rotates a rotor of the stepping motor to a prescribed position; and
after outputting the driving pulse but before said driving pulse causes electromotive force to be generated by the rotation of the rotor of the stepping motor, outputting a rotation assistance pulse for rotating the rotor of the stepping motor at a prescribed speed.

Assignees

• Casio Computer Co Ltd

Inventors

• Hosobuchi Hiroyuki

Classifications

• G04C3/143

  Means to reduce power consumption by reducing pulse width or amplitude and related problems, e.g. detection of unwanted or missing step · CPC title

• H02P8/14

  Arrangements for controlling speed or speed and torque (H02P8/12, H02P8/22 take precedence) · CPC title

• H02P8/00 Primary

  Arrangements for controlling dynamo-electric motors rotating step by step · CPC title

• G04B47/068

  with a thermometer · CPC title

• G04G5/027 Primary

  by adding or suppressing individual pulses, e.g. for step-motor · CPC title