US5008607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Driving system for stepping motor
Assignee: Canon Inc
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Filing: 1989-06-29
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Granted: 1991-04-16
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Expires: 2009-06-29
Abstract
Abstract A driving system for a stepping motor wherein the stepping motor is rotated by a predetermined angle for each driving step. The system counts the time between two successive driving triggers, and changes at least one of the phase energization current and the phase energization time at the start of the driving of the stepping motor in response to the time count.
Inventors
- 👤 Takeshi Ono
- 👤 Masahiro Sakamoto
- 👤 Tadashi Takano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:01
CPC Classifications
H; H02; H02P; H02P8/00; H02P8/04; H02P8/14; H02P8/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
100 words
A driving system for a stepping motor wherein a stepping motor is rotatively driven by a predetermined number of steps for each driving trigger, comprising: a stepping motor having a plurality of energization coils through each of which an energization current flows to drive said stepping motor; a plurality of drivers for applying said energization current to the respective energization coils of said stepping motor; a counting means for counting a time between two successive driving triggers; and an energization controlling means controlling said energization current of said stepping motor in response to said time counted by said counting means.
Claim 2
Dependent Claim
100 words
A driving system for a stepping motor wherein a stepping motor is rotatively driven by a predetermined number of steps for each driving trigger, comprising: a stepping motor having a plurality of energization coils through each of which an energization current flows to drive said stepping motor; a plurality of drivers for applying said energization current to the respective energization coils of said stepping motor; a counting means for counting a time between two successive driving triggers; and an energization controlling means controlling said energization current of said stepping motor in response to said time counted by said counting means.
Claim 3
Dependent Claim
39 words
A stepping motor driving system according to claim 1, wherein, when said time counted by said counting means is small, said energization controlling means controls said energization current so that said stepping motor is rotated at a high speed.
Claim 4
Dependent Claim
46 words
A stepping motor driving system according to claim 1, wherein said energization controlling means controls said energization current for said plurality of drivers after inputting said driving trigger, in such a manner that said stepping motor is rotated by small driving steps for each driving trigger.
Claim 5
Dependent Claim
28 words
A stepping motor driving system according to claim 1, wherein said energization controlling means controls a current level of said energization current as well as an energization time.
Claim 6
Dependent Claim
21 words
A stepping motor driving system according to claim 3, wherein said stepping motor driving system is used in a facsimile machine.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-04-15 | 1994-10-15 | 1995-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-15 | 1998-10-15 | 1999-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-15 | 2002-10-15 | 2003-04-16 | $7700.00 | Window Closed / Lapsed |