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US4647827A
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US
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Absolute position detecting system for servocontrol system
Assignee: Fanuc Corp
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Filing: 1984-04-11
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Granted: 1987-03-03
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Expires: 2004-04-11
Abstract
Abstract An absolute position detecting system for a servocontrol system which has its operation controlled in accordance with a numerical control program. Resolvers 202 and absolute encoders 110 made rotatable with a servomotor 105, are set at a predetermined revolving ratio so that the absolute positions of operating axes may be detected highly accurately from the revolution outputs of the two. The detecting operations can be performed for the plural operating axes by using one detecting circuit commonly.
Inventors
- 👤 Kenichi Toyoda
- 👤 Hideo Miyashita
- 👤 Shinsuke Sakakibara
- 👤 Hatsumi Naruo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:45
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/12; G01D5/244; G01D5/245; G01D5/2454; G01D5/2458; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/39; G05B2219/00; G05B2219/30; G05B2219/37; G05B2219/37175; G05B2219/37297; G05B2219/37471
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
157 words
An absolute position detecting system for a servocontrol system for servo-controlling servomotors for driving respective operating axes, comprising: resolvers for respectively detecting coarse rotational positions of servomotors for plural operating axes in accordance with the revolutions of the servomotors; absolute encoders for respectively detecting fine rotational positions of the servomotors for plural operating axes in accordance with the revolutions of the servomotors, said resolvers and said absolute encoders revolving at a ratio of 1:m; a detecting circuit for detecting absolute positions of the servomotors from the detected outputs of said resolvers and the detected outputs of said absolute encoders; and a switch, coupled between said detecting circuit and said resolvers and said absolute encoders, for switching to connect a selected one of said resolvers and a selected one of said absolute encoders for a selected one of the operating axes to said detecting circuit, so that said detecting circuit is used commonly for the plural operating axes.
Claim 2
Dependent Claim
157 words
An absolute position detecting system for a servocontrol system for servo-controlling servomotors for driving respective operating axes, comprising: resolvers for respectively detecting coarse rotational positions of servomotors for plural operating axes in accordance with the revolutions of the servomotors; absolute encoders for respectively detecting fine rotational positions of the servomotors for plural operating axes in accordance with the revolutions of the servomotors, said resolvers and said absolute encoders revolving at a ratio of 1:m; a detecting circuit for detecting absolute positions of the servomotors from the detected outputs of said resolvers and the detected outputs of said absolute encoders; and a switch, coupled between said detecting circuit and said resolvers and said absolute encoders, for switching to connect a selected one of said resolvers and a selected one of said absolute encoders for a selected one of the operating axes to said detecting circuit, so that said detecting circuit is used commonly for the plural operating axes.
Claim 3
Dependent Claim
27 words
An absolute position detecting system according to claim 1, wherein the revolving ratio of 1:m of said resolvers and said absolute encoders is selected such that m>1.
Claim 4
Dependent Claim
43 words
An absolute position detecting system according to claim 1, wherein said detecting circuit comprises a memory circuit for setting edge-detected outputs of the detected outputs of said absolute encoders, so that the servomotors may be stopped by the output of said memory circuit.
Claim 5
Dependent Claim
43 words
An absolute position detecting system according to claim 2, wherein said detecting circuit comprises a memory circuit for setting edge-detected outputs of the detected outputs of said absolute encoders, so that the servomotors may be stopped by the output of said memory circuit.
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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) | 1990-03-02 | 1990-09-01 | 1991-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-02 | 1994-09-01 | 1995-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-02 | 1998-09-01 | 1999-03-03 | $7700.00 | Window Closed / Lapsed |