Patent US5920175A successfully refreshed from Google Patents.
US5920175A
Expired / Lapsed
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Instantaneous position indicating apparatus for a sensorless switched reluctance machine system
Assignee: Sundstrand Corp
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Filing: 1996-04-09
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Granted: 1999-07-06
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Expires: 2016-04-09
Abstract
Abstract A sensorless control for operating an inverter coupled to a switched reluctance machine includes an instantaneous position generation circuit that develops a signal for controlling commutation of the switched reluctance machine. The instantaneous position generation circuit includes a digitally controlled counter which provides a direct interface between a position estimation circuit and commutation logic for the inverter.
Inventors
- 👤 Stephen R. Jones
- 👤 Barry T. Drager
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:57
CPC Classifications
H; H02; H02P; H02P9/00; H02P9/40; H02P25/00; H02P25/02; H02P25/08; H02P25/086; H02P25/089; H02P2101/00; H02P2101/30
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
103 words
Apparatus for converting a first machine position signal representing a series of indications of position of a machine at a first position update rate into a second machine position signal representing a series of machine position indications at a second position update rate greater than the first position update rate, comprising: a counter having a clock input responsive to a clock signal, an increment input and an output at which the second machine position signal is developed; and means responsive to the first machine position signal and coupled to the increment input of the counter for deriving an increment signal for the counter.
Claim 2
Dependent Claim
103 words
Apparatus for converting a first machine position signal representing a series of indications of position of a machine at a first position update rate into a second machine position signal representing a series of machine position indications at a second position update rate greater than the first position update rate, comprising: a counter having a clock input responsive to a clock signal, an increment input and an output at which the second machine position signal is developed; and means responsive to the first machine position signal and coupled to the increment input of the counter for deriving an increment signal for the counter.
Claim 3
Dependent Claim
14 words
The apparatus of claim 1, wherein the counter comprises a digitally controlled counter (DCC).
Claim 4
Dependent Claim
48 words
The apparatus of claim 2, wherein a machine speed signal is developed representing a series of indications of machine speed and wherein the deriving means includes means for summing the machine speed signal with an error signal representing a difference between the first and second machine position signals.
Claim 5
Dependent Claim
43 words
The apparatus of claim 3, wherein the DCC includes an accumulator having addition inputs and an output and wherein the output of the accumulator is coupled to one of the addition inputs and the other of the addition inputs receives the increment signal.
Claim 6
Dependent Claim
16 words
The apparatus of claim 1, further including means for preloading an initialization value into the counter.
Claim 7
Dependent Claim
126 words
In a sensorless control for a switched reluctance machine having an estimator which develops a first machine rotor position estimate at a first position update rate and which develops a machine rotor speed estimate, position generation means coupled to the estimator for developing a second machine rotor position estimate at a second position update rate greater than the first position update rate, comprising: a counter having a clock input responsive to a clock signal, an increment input and an output at which the second rotor position estimate is developed; and means responsive to at least one of the machine rotor speed estimate and the first machine rotor position estimate and coupled to the increment input of the counter for deriving an increment signal for the counter.
Claim 8
Dependent Claim
126 words
In a sensorless control for a switched reluctance machine having an estimator which develops a first machine rotor position estimate at a first position update rate and which develops a machine rotor speed estimate, position generation means coupled to the estimator for developing a second machine rotor position estimate at a second position update rate greater than the first position update rate, comprising: a counter having a clock input responsive to a clock signal, an increment input and an output at which the second rotor position estimate is developed; and means responsive to at least one of the machine rotor speed estimate and the first machine rotor position estimate and coupled to the increment input of the counter for deriving an increment signal for the counter.
Claim 9
Dependent Claim
16 words
The position generating means of claim, 6, wherein the counter comprises a digitally controlled counter (DCC).
Claim 10
Dependent Claim
36 words
The position generating means of claim 7, wherein the deriving means includes means for summing the machine rotor speed estimate with an error signal representing a difference between the first and second machine rotor position estimates.
Claim 11
Dependent Claim
45 words
The position generating means of claim 8, wherein the DCC includes an accumulator having addition inputs and an output and wherein the output of the accumulator is coupled to one of the addition inputs and the other of the addition inputs receives the increment signal.
Claim 12
Dependent Claim
18 words
The position generating means of claim 9, further including means for preloading an initialization value into the counter.
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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) | 2002-07-05 | 2003-01-04 | 2003-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-07-05 | 2007-01-04 | 2007-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-07-05 | 2011-01-04 | 2011-07-06 | $7700.00 | Window Closed / Lapsed |