Patent US5864217A successfully refreshed from Google Patents.
US5864217A
Expired / Lapsed
US
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Switched reluctance machine with toothed-wheel rotor sensor
Assignee: General Electric Co
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Filing: 1997-05-08
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Granted: 1999-01-26
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Expires: 2017-05-08
Abstract
Abstract An apparatus and method for estimating rotor position in and commutating a switched reluctance motor (SRM), using both a flux/current SRM angle estimator and a toothed wheel generating a magnetic pickup. Commutation is based on the flux/current SRM at startup and lower speeds. At higher speeds, when magnetic pickup sensed from the toothed wheel is sufficiently large in amplitude to create frequent reliable interrupts, commutation is based on signals from the toothed wheel magnetic pickup. Phase errors can be compensated by adjusting the angle input to the commutator as a function of estimated speed. Alternatively, the flux/current SRM angle estimator can be run in a background mode to tune the toothed wheel interrupt angle signal at different speeds.
Inventors
- 👤 James Patrick Lyons
- 👤 Mark Alan Preston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:05
CPC Classifications
H; H02; H02P; H02P25/00; H02P25/02; H02P25/08; H02P25/086; H02P25/089
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
115 words
A switched reluctance machine, comprising: a toothed-wheel rotor for providing magnetic pickup signals; an interrupt timer for receiving the magnetic pickup signals and generating interrupt signals; a flux/current angle estimator for receiving phase flux-linkage and current signals from the machine and generating angle estimation signals; control logic for determining whether the amplitude of the magnetic pickup signal falls below a predetermined threshold; a multiplexer for providing multiplexer signals comprising the angle estimation signals when the amplitude of the magnetic pickup signal falls below the pre-determined threshold and the interrupt signals when the amplitude of the magnetic pickup signal rises above the predetermined threshold; and a commutator for receiving the multiplexer signals and generating commutation signals.
Claim 2
Dependent Claim
115 words
A switched reluctance machine, comprising: a toothed-wheel rotor for providing magnetic pickup signals; an interrupt timer for receiving the magnetic pickup signals and generating interrupt signals; a flux/current angle estimator for receiving phase flux-linkage and current signals from the machine and generating angle estimation signals; control logic for determining whether the amplitude of the magnetic pickup signal falls below a predetermined threshold; a multiplexer for providing multiplexer signals comprising the angle estimation signals when the amplitude of the magnetic pickup signal falls below the pre-determined threshold and the interrupt signals when the amplitude of the magnetic pickup signal rises above the predetermined threshold; and a commutator for receiving the multiplexer signals and generating commutation signals.
Claim 3
Dependent Claim
14 words
The machine of claim 1, wherein the rotor comprises one tooth per rotor pole.
Claim 4
Dependent Claim
47 words
The machine of claim 1, wherein the multiplexer signals include an electrical angle estimate, and wherein the flux/current angle estimator is adapted to compensate for phase errors of the electrical angle estimate by adjusting the angle estimate as a function of an estimated speed of the rotor.
Claim 5
Dependent Claim
37 words
The machine of claim 1, wherein the multiplexer signals include an electrical angle estimate, and wherein the flux/current angle estimator is adapted to compensate for phase errors of the electrical angle estimate by tuning the interrupt signals.
Claim 6
Dependent Claim
64 words
The machine of claim 1, wherein the commutator comprises a state estimator/observer and a commutation timer, the state estimator/observer being adapted to receive the multiplexer signals, use the multiplexer signals to estimate the mechanical state of the rotor, and provide the estimated mechanical state to the commutation timer, the commutation timer being adapted to translate the estimated mechanical state and generate the commutation signals.
Claim 7
Dependent Claim
19 words
The machine of claim 5, wherein the state estimator/observer includes a constant-gain Kalman filter and a sliding mode observer.
Claim 8
Independent Claim
88 words
A method for commutating a switched reluctance machine, comprising: providing magnetic pickup signals from a toothed-wheel rotor; using the magnetic pickup signals to generating interrupt signals; using phase flux-linkage and current signals from the machine to generate flux/current angle estimation signals; providing input signals comprising the angle estimation signals when the amplitude of the magnetic pickup signal falls below a pre-determined threshold and the interrupt signals when the amplitude of the magnetic pickup signal rises above the predetermined threshold; and using the input signals to generate commutation signals.
Claim 9
Independent Claim
88 words
A method for commutating a switched reluctance machine, comprising: providing magnetic pickup signals from a toothed-wheel rotor; using the magnetic pickup signals to generating interrupt signals; using phase flux-linkage and current signals from the machine to generate flux/current angle estimation signals; providing input signals comprising the angle estimation signals when the amplitude of the magnetic pickup signal falls below a pre-determined threshold and the interrupt signals when the amplitude of the magnetic pickup signal rises above the predetermined threshold; and using the input signals to generate commutation signals.
Claim 10
Dependent Claim
13 words
The method of claim 7, further comprising providing one tooth per rotor pole.
Claim 11
Dependent Claim
40 words
The method of claim 7, wherein the input signals include an electrical angle estimate, and further including compensating phase errors of the electrical angle estimate by adjusting the angle estimate as a function of an estimated speed of the rotor.
Claim 12
Dependent Claim
30 words
The method of claim 7, wherein the input signals include an electrical angle estimate, and further including compensating phase errors of the electrical angle estimate by tuning the interrupt signals.
References Cited (Backward Citations)
US4776359A
Cited
US4772839A
Cited
US5315224A
Cited
US5097190A
Cited
US5107195A
Cited
US5140243A
Cited
US5325026A
Cited
US5525886A
Cited
US5736828A
Cited
US5689165A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-01-25 | 2002-07-27 | 2003-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-01-25 | 2006-07-27 | 2007-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-01-25 | 2010-07-27 | 2011-01-26 | $7700.00 | Window Closed / Lapsed |