Patent US4289997A successfully refreshed from Google Patents.
US4289997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drive apparatus having at least two electric motors
Assignee: Keiper Automobiltechnik GmbH and Co KG
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Filing: 1979-06-22
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Granted: 1981-09-15
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Expires: 1999-06-22
Abstract
Abstract A drive apparatus has at least two electric motors. There is also a central control common to all motors which lie in series in a closed-circuit energy supply. Each motor has an individual control unit which can be turned on and off from the central control via a control line by an address. Each motor also contains a short-circuit device lying in parallel with its connecting terminals.
Inventors
- 👤 Bernhard Jung
- 👤 Michael Teichmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:48
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/40; G05B19/414; G05B19/4142; H; H02; H02P; H02P5/00; H02P6/00; H02P6/04; H02P8/00; H02P8/14; H02P8/20; H02P8/40; G05B2219/00; G05B2219/20; G05B2219/21; G05B2219/21032; G05B2219/25; G05B2219/25309; G05B2219/30; G05B2219/33; G05B2219/33223; G05B2219/33226; G05B2219/34; G05B2219/34222; G05B2219/34226; G05B2219/50; G05B2219/50084; G05B2219/50085
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
93 words
Drive apparatus, having a plurality of electric motors and a central control common to the plurality of motors, from which central control each motor can be turned on and off, comprising: said plurality of motors lies in series in closed-circuit energy supply; each of said plurality of motors has a control unit which can be turned on from the central control via a control line common to said plurality of motors by an address; and each of said plurality of control units contains a short-circuit device connected in parallel with its connecting terminals.
Claim 2
Dependent Claim
93 words
Drive apparatus, having a plurality of electric motors and a central control common to the plurality of motors, from which central control each motor can be turned on and off, comprising: said plurality of motors lies in series in closed-circuit energy supply; each of said plurality of motors has a control unit which can be turned on from the central control via a control line common to said plurality of motors by an address; and each of said plurality of control units contains a short-circuit device connected in parallel with its connecting terminals.
Claim 3
Dependent Claim
16 words
Drive apparatus according to claim 1, wherein some of the plurality of motors are step motors.
Claim 4
Dependent Claim
90 words
Drive apparatus according to claim 2, wherein: each of the step motors has a stator with two groups of windings which lie in line with one of a first and a second lead of the closed-circuit energy supply; said two groups of windings having at least four poles, so that successive circumferential poles in the order of a winding are associated with one of the first and second group; and a windingless rotor having a number of permanent magnet-activated poles corresponding to the number of pole pairs of the stator.
Claim 5
Dependent Claim
105 words
Drive apparatus according to claim 1, wherein: the plurality of motors have a direct current winding in a stator and a windingless rotor which has a number of permanent magnet-activated pole pairs corresponding to the pole pairs of the stator; the control unit contains a signal sender which produces a position characterization and commutation signal over a control line common to the plurality of motors after each rotation of the windingless rotor; and the central control which has associated therewith a current supply unit determines the direction of current flow in the closed-circuit energy supply on the basis of the position characterization and commutation signal.
Claim 6
Dependent Claim
52 words
Drive apparatus according to claim 1, wherein the central control includes a micro-processor which determines direction of current flow in the closed-circuit energy supply and also determines changes in the direction of the current flow while taking into consideration a selected direction of rotation provided for one of the plurality of motors.
Claim 7
Dependent Claim
58 words
Drive apparatus according to claim 5, wherein the micro-processor keeps stored at least a last position characterization and commutation signal of each of said plurality of motors and establishes a direction of a turn-on current on the basis of the last position characterization and commutation signal as well as on the basis of the selected direction of rotation.
Claim 8
Dependent Claim
35 words
Drive apparatus according to claim 5, wherein the micro-processor ascertains and stores a position of the drive apparatus having a plurality of motors on the basis of angular steps performed by the plurality of motors.
Claim 9
Dependent Claim
23 words
Drive apparatus according to claim 1, wherein the control unit of the plurality of motors includes a decoder which controls the short-circuit device.
Claim 10
Dependent Claim
29 words
Drive apparatus according to claim 4, wherein the signal sender is formed by a winding lying in the stator and interlinked with a magnetic field of the windingless rotor.
Claim 11
Dependent Claim
23 words
Drive apparatus according to claim 4, wherein the signal sender is a Hall generator lying in a magnetic field of the windingless rotor.
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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) | 1984-09-14 | 1985-03-16 | 1985-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-14 | 1989-03-16 | 1989-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-14 | 1993-03-16 | 1993-09-15 | $7700.00 | Window Closed / Lapsed |