Patent US4409530A successfully refreshed from Google Patents.
US4409530A
Expired / Lapsed
US
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Method and apparatus for stepper motor position control
Assignee: Beckman Coulter Inc
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Filing: 1980-11-10
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Granted: 1983-10-11
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Expires: 2000-11-10
Abstract
Abstract A stepper motor positioning control utilizing phase detection of the stepper motor windings. The device utilizes crude positioning apparatus to position the attached turntable or the like in an approximate position. The phase detection of the stepper motor windings is then used to position the attached turntable in the exact location desired.
Inventors
- 👤 Robert K. Neeper
- 👤 Richard C. Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:38
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/39; G05B2219/00; G05B2219/30; G05B2219/41; G05B2219/41326
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
76 words
Apparatus for positioning a turntable comprising: a four winding stepping motor coupled with said turntable; means, connected to said four windings, for energizing said four windings; a NAND gate connected to said energizing means; an optical sensor, associated with said turntable and connected to said NAND gate; a position encoder, associated with said turntable and connected to said NAND gate; and a comparator, connected to at least two of said windings and to said NAND gate.
Claim 2
Dependent Claim
76 words
Apparatus for positioning a turntable comprising: a four winding stepping motor coupled with said turntable; means, connected to said four windings, for energizing said four windings; a NAND gate connected to said energizing means; an optical sensor, associated with said turntable and connected to said NAND gate; a position encoder, associated with said turntable and connected to said NAND gate; and a comparator, connected to at least two of said windings and to said NAND gate.
Claim 3
Dependent Claim
20 words
Apparatus according to claim 1 further including a voltage control circuit connected to said stepping motor and said position encoder.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-10 | 1987-04-11 | 1987-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-10 | 1991-04-11 | 1991-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-10 | 1995-04-11 | 1995-10-11 | $7700.00 | Window Closed / Lapsed |