US5689165A
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US
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Estimator initialization circuit and method for a sensorless switched reluctance machine system
Assignee: Sundstrand Corp
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Filing: 1996-04-09
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Granted: 1997-11-18
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Expires: 2016-04-09
Abstract
Abstract An estimator initialization circuit for a sensorless switched reluctance machine system pulses phase windings of the machine a certain number of times and derives initial values for an estimator of the system.
Inventors
- 👤 Stephen R. Jones
- 👤 Barry T. Drager
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:41
CPC Classifications
H; H02; H02P; H02P9/00; H02P9/40; H02P25/00; H02P25/02; H02P25/08; H02P25/086; H02P25/089; H02P6/00; H02P6/14; H02P6/16; H02P6/17; H02P2101/00; H02P2101/30
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
114 words
Apparatus for developing an initial estimate of a condition of a machine having a plurality of phase windings each coupled to a power converter, wherein a first circuit is coupled to the phase windings for developing a plurality of phase relative angle estimates and a second circuit is coupled to the first circuit and combines the plurality of phase relative angle estimates into a single estimate, comprising: means for pulsing the phase windings during an initialization period such that the second circuit develops a sequence of phase relative angle estimates; and means coupled to the second circuit for deriving the initial estimate of the machine condition from the sequence of phase relative angle estimates.
Claim 2
Dependent Claim
114 words
Apparatus for developing an initial estimate of a condition of a machine having a plurality of phase windings each coupled to a power converter, wherein a first circuit is coupled to the phase windings for developing a plurality of phase relative angle estimates and a second circuit is coupled to the first circuit and combines the plurality of phase relative angle estimates into a single estimate, comprising: means for pulsing the phase windings during an initialization period such that the second circuit develops a sequence of phase relative angle estimates; and means coupled to the second circuit for deriving the initial estimate of the machine condition from the sequence of phase relative angle estimates.
Claim 3
Dependent Claim
38 words
The apparatus of claim 1, wherein the deriving means comprises means for determining whether each phase relative angle estimate is valid and means for obtaining a sequence of machine rotor position estimates from valid phase relative angle estimates.
Claim 4
Dependent Claim
28 words
The apparatus of claim 2, wherein the deriving means includes means for calculating a sequence of machine rotor velocity estimates from the sequence of machine rotor position estimates.
Claim 5
Dependent Claim
30 words
The apparatus of claim 3, wherein the deriving means further includes means for averaging the sequence of machine rotor velocity estimates to obtain an initial estimate of machine rotor velocity.
Claim 6
Dependent Claim
21 words
The apparatus of claim 2, wherein the deriving means further includes means for disregarding a number of phase relative angle estimates.
Claim 7
Dependent Claim
20 words
The apparatus of claim 1, wherein the pulsing means is operable a certain number of times during the initialization period.
Claim 8
Dependent Claim
112 words
In a sensorless control for a switched reluctance machine having a plurality of phase windings each coupled to a power converter, a first circuit coupled to the phase windings for developing a plurality of phase relative angle estimates, a second circuit for combining the plurality of phase relative angle estimates into a single estimate, apparatus for developing an initial estimate of a machine condition, comprising: means for pulsing the phase windings during an initialization period such that the second circuit develops a sequence of phase relative angle estimates; and means coupled to the second circuit for deriving the initial estimate of the machine condition from the sequence of phase relative angle estimates.
Claim 9
Dependent Claim
112 words
In a sensorless control for a switched reluctance machine having a plurality of phase windings each coupled to a power converter, a first circuit coupled to the phase windings for developing a plurality of phase relative angle estimates, a second circuit for combining the plurality of phase relative angle estimates into a single estimate, apparatus for developing an initial estimate of a machine condition, comprising: means for pulsing the phase windings during an initialization period such that the second circuit develops a sequence of phase relative angle estimates; and means coupled to the second circuit for deriving the initial estimate of the machine condition from the sequence of phase relative angle estimates.
Claim 10
Dependent Claim
38 words
The apparatus of claim 7, wherein the deriving means comprises means for determining whether each phase relative angle estimate is valid and means for obtaining a sequence of machine rotor position estimates from valid phase relative angle estimates.
Claim 11
Dependent Claim
28 words
The apparatus of claim 8, wherein the deriving means includes means for calculating a sequence of machine rotor velocity estimates from the sequence of machine rotor position estimates.
Claim 12
Dependent Claim
30 words
The apparatus of claim 9, wherein the deriving means further includes means for averaging the sequence of machine rotor velocity estimates to obtain an initial estimate of machine rotor velocity.
Claim 13
Dependent Claim
21 words
The apparatus of claim 8, wherein the deriving means further includes means for disregarding an number of phase relative angle estimates.
Claim 14
Dependent Claim
26 words
The apparatus of claim 7, wherein the pulsing means is operable to provide a certain number of pulses to each phase winding during the initialization period.
Claim 15
Independent Claim
116 words
A method of developing an initial estimate of a condition of a machine having a plurality of phase windings each coupled to a power converter, wherein a first circuit is coupled to the phase windings for developing a plurality of phase relative angle estimates and a second circuit is coupled to the first circuit and combines the plurality of phase relative angle estimates into a single estimate, the method comprising the steps of: providing a number of pulses to the phase windings during an initialization period such that the second circuit develops a sequence of phase relative angle estimates; and deriving the initial estimate of the machine condition from the sequence of phase relative angle estimates.
Claim 16
Independent Claim
116 words
A method of developing an initial estimate of a condition of a machine having a plurality of phase windings each coupled to a power converter, wherein a first circuit is coupled to the phase windings for developing a plurality of phase relative angle estimates and a second circuit is coupled to the first circuit and combines the plurality of phase relative angle estimates into a single estimate, the method comprising the steps of: providing a number of pulses to the phase windings during an initialization period such that the second circuit develops a sequence of phase relative angle estimates; and deriving the initial estimate of the machine condition from the sequence of phase relative angle estimates.
Claim 17
Dependent Claim
38 words
The method of claim 13, wherein the step of deriving includes the steps of determining whether each phase relative angle estimate is valid and obtaining a sequence of machine rotor position estimates from valid phase relative angle estimates.
Claim 18
Dependent Claim
30 words
The method of claim 14, wherein the step of deriving includes the step of calculating a sequence of machine rotor velocity estimates from the sequence of machine rotor position estimates.
Claim 19
Dependent Claim
33 words
The method of claim 15, wherein the step of deriving further 2 includes the step of averaging the sequence of machine rotor velocity estimates to obtain an initial estimate of machine rotor velocity.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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