Stepping motor control device and conveying device provided with the same
US-9181057-B2 · Nov 10, 2015 · US
Stepping motor driving device and timepiece
US10014806B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10014806-B2 |
| Application number | US-201615009679-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 28, 2016 |
| Priority date | Mar 19, 2015 |
| Publication date | Jul 3, 2018 |
| Grant date | Jul 3, 2018 |
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- Title
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- Abstract
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Abstract
Official abstract text for this publication.
A stepping motor driving device drives a first coil and a second coil. The stepping motor driving device includes a motor control unit. The motor control unit applies a predetermined voltage to the first coil in a first phase, applies the predetermined voltage to the second coil in a second phase after the first phase, and alternately applies the predetermined voltage to the first coil and the second coil in a third phase after the second phase.
First claim
Opening claim text (preview).
What is claimed is: 1. A stepping motor driving device which drives a first coil and a second coil, the stepping motor driving device comprising: a motor control unit that applies a predetermined voltage to the first coil in a first phase, that applies the predetermined voltage to the second coil in a second phase after the first phase, and that alternately applies the predetermined voltage to the first coil and the second coil in a third phase after the second phase, wherein, during the third phase, the motor control unit controls an application pattern of the predetermined voltage applied to the first and second coils such that a peak current is lower than a peak current in a case where the predetermined voltage is applied to the first and second coils with a same polarity. 2. The stepping motor driving device according to claim 1 , wherein: the motor control unit alternately applies the predetermined voltage to the first coil and the second coil with a same duty ratio in the third phase. 3. A timepiece comprising the stepping motor driving device according to claim 2 . 4. The stepping motor driving device according to claim 1 , wherein: a period for which the motor control unit applies the predetermined voltage to the first coil and the second coil in the third phase is 1/n of a time period of the third phase; and n is a natural number equal to or greater than two. 5. A timepiece comprising the stepping motor driving device according to claim 4 . 6. The stepping motor driving device according to claim 1 , wherein: a third period for which the motor control unit applies the predetermined voltage to the first coil and the second coil in the third phase is different from a first period for which the motor control unit applies the predetermined voltage to the first coil in the first phase; and the third period is different from a second period for which the motor control unit applies the predetermined voltage to the second coil in the second phase. 7. A timepiece comprising the stepping motor driving device according to claim 6 . 8. A timepiece comprising the stepping motor driving device according to claim 1 .
Assignees
Inventors
Classifications
incorporating two or more stepping motors or rotors · CPC title
- H02P8/12Primary
Control or stabilisation of current · CPC title
specially adapted for single-phase or bi-pole stepper motors, e.g. watch-motors, clock-motors · CPC title
Means to reduce power consumption by reducing pulse width or amplitude and related problems, e.g. detection of unwanted or missing step · CPC title
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Frequently asked questions
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- What does patent US10014806B2 cover?
- A stepping motor driving device drives a first coil and a second coil. The stepping motor driving device includes a motor control unit. The motor control unit applies a predetermined voltage to the first coil in a first phase, applies the predetermined voltage to the second coil in a second phase after the first phase, and alternately applies the predetermined voltage to the first coil and the …
- Who is the assignee on this patent?
- Casio Computer Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification H02P8/12. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Jul 03 2018 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).