US6586914B2
Expired / Lapsed
US
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Wound field synchronous machine control system and method
Assignee: Transportation IP Holdings LLC
•
Filing: 2001-11-19
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Granted: 2003-07-01
•
Expires: 2021-11-19
Abstract
Abstract A wound field synchronous machine control system comprises: an auxiliary winding for obtaining auxiliary AC voltage from the wound field synchronous machine; a phase controlled rectifier for rectifying the auxiliary AC voltage and supplying rectified DC voltage to the wound field synchronous machine; and a controller. The controller is configured for using a voltage signal across the auxiliary winding to obtain volt-second values of the auxiliary winding and using the volt-second values for firing angle control of switches of the phase controlled rectifier. Alternatively or additionally, the controller is configured for obtaining airgap flux values of the wound field synchronous machine and using the airgap flux values for firing angle control of switches of the phase controlled rectifier.
Inventors
- 👤 Neil Richard Garrigan
- 👤 Henry Todd Young
- 👤 Bradley Allen Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:26
CPC Classifications
H; H02; H02P; H02P9/00; H02P9/14; H02P9/26; H02P9/30; H02P9/305; B; B60; B60L; B60L50/00; B60L50/10; B60L2210/00; B60L2210/20; B60L2220/00; B60L2220/10; B60L2220/14; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64; Y02T10/70; Y02T10/7072; Y02T10/72
Claims Analysis
Total Claims: 69
Claim 1
Independent Claim
82 words
A wound field synchronous machine control system comprising: (a) an auxiliary winding for obtaining auxiliary AC voltage from the wound field synchronous machine; (b) a phase controlled rectifier for rectifying the auxiliary AC voltage and supplying rectified DC voltage to the wound field synchronous machine; and (c) a controller for using a voltage signal across the auxiliary winding to obtain volt-second values of the auxiliary winding and using the volt-second values for firing angle control of switches of the phase controlled rectifier.
Claim 2
Dependent Claim
82 words
A wound field synchronous machine control system comprising: (a) an auxiliary winding for obtaining auxiliary AC voltage from the wound field synchronous machine; (b) a phase controlled rectifier for rectifying the auxiliary AC voltage and supplying rectified DC voltage to the wound field synchronous machine; and (c) a controller for using a voltage signal across the auxiliary winding to obtain volt-second values of the auxiliary winding and using the volt-second values for firing angle control of switches of the phase controlled rectifier.
Claim 3
Dependent Claim
43 words
The system of claim 1 wherein the control system is further configured to use the voltage signal to measure voltage integrals, and use the voltage integrals to detect zero crossings, obtain the volt-second values, and synchronize the firing angle control of the switches.
Claim 4
Dependent Claim
37 words
The system of claim 2 wherein the controller is configured for using the voltage integrals to detect zero crossings by using two integrations, each integration corresponding to a respective positive or negative polarity of the voltage signal.
Claim 5
Dependent Claim
38 words
The system of claim 3 wherein, the controller is configured for, upon detection of a potential zero crossing in one of the positive and negative polarities, beginning an integration for the other of the positive and negative polarities.
Claim 6
Dependent Claim
33 words
The system of claim 2 wherein the control system is further configured to use the voltage signal to measure the voltage integrals in rectified half cycles of a waveform of the voltage signal.
Claim 7
Dependent Claim
28 words
The system of claim 5 wherein the control system is further configured to use the zero-crossings to obtain a timing signal for synchronizing and resetting the voltage integrals.
Claim 8
Dependent Claim
28 words
The system of claim 6 wherein the control system is further configured to compare a present voltage integral with a previous voltage integral minus a present volt-second command.
Claim 9
Dependent Claim
65 words
A control system comprising: (a) a sensor for obtaining a voltage signal across a winding; (b) a phase controlled rectifier for rectifying AC voltage and supplying rectified DC voltage; (c) a controller for using the voltage signal to measure voltage integrals, and using the voltage integrals to detect zero crossings, obtain volt-second values, and synchronize firing angle control of switches of the phase controlled rectifier.
Claim 10
Dependent Claim
65 words
A control system comprising: (a) a sensor for obtaining a voltage signal across a winding; (b) a phase controlled rectifier for rectifying AC voltage and supplying rectified DC voltage; (c) a controller for using the voltage signal to measure voltage integrals, and using the voltage integrals to detect zero crossings, obtain volt-second values, and synchronize firing angle control of switches of the phase controlled rectifier.
Claim 11
Dependent Claim
37 words
The system of claim 8 wherein the controller is configured for using the voltage integrals to detect zero crossings by using two integrations, each integration corresponding to a respective positive or negative polarity of the voltage signal.
Claim 12
Dependent Claim
37 words
The system of claim 9 wherein, the controller is configured for, upon detection of a zero crossing in one of the positive and negative polarities, beginning an integration for the other of the positive and negative polarities.
Claim 13
Dependent Claim
76 words
A wound field synchronous machine control system comprising: (a) an auxiliary winding for obtaining auxiliary AC voltage from the wound field synchronous machine; (b) a phase controlled rectifier for rectifying the auxiliary AC voltage and supplying rectified DC voltage to the wound field synchronous machine; (c) a controller for obtaining airgap flux values of the wound field synchronous machine and using the airgap flux values for firing angle control of switches of the phase controlled rectifier.
Claim 14
Dependent Claim
76 words
A wound field synchronous machine control system comprising: (a) an auxiliary winding for obtaining auxiliary AC voltage from the wound field synchronous machine; (b) a phase controlled rectifier for rectifying the auxiliary AC voltage and supplying rectified DC voltage to the wound field synchronous machine; (c) a controller for obtaining airgap flux values of the wound field synchronous machine and using the airgap flux values for firing angle control of switches of the phase controlled rectifier.
Claim 15
Dependent Claim
22 words
The system of claim 11 wherein the controller is configured to use current feedback sensor measurements to obtain the airgap flux values.
Claim 16
Dependent Claim
42 words
The system of claim 12 further comprising a DC load current sensor and a field winding current sensor, and wherein the controller is configured to use measurements from the DC load and field winding current sensors to obtain the airgap flux values.
Claim 17
Dependent Claim
22 words
The system of claim 13 wherein the controller is configured to use a load saturation model to obtain the airgap flux values.
Claim 18
Dependent Claim
21 words
The system of claim 13 wherein the controller is configured to use a flux function to obtain the airgap flux values.
Claim 19
Dependent Claim
24 words
The system of claim 11 wherein the controller is configured to use current and voltage feedback sensor measurements to obtain the airgap flux values.
Claim 20
Dependent Claim
29 words
The system of claim 16 wherein the controller is configured to use current feedback sensor measurements for low frequency operation and voltage feedback sensor measurements for higher frequency operation.
Claim 21
Dependent Claim
51 words
The system of claim 11 wherein the controller is configured to obtain a feedforward flux command in response to changes in a load voltage command and to use the feedforward flux command in combination with the airgap flux values for firing angle control of the switches of the phase controlled rectifier.
Claim 22
Dependent Claim
50 words
The system of claim 11 wherein the controller is configured to obtain a state feedback decoupling flux signal in response to state changes and to use the feedback decoupling flux signal in combination with the airgap flux values for firing angle control of the switches of the phase controlled rectifier.
Claim 23
Dependent Claim
57 words
The system of claim 11 wherein the controller further comprises a voltage regulator for generating a flux command, a summation element for subtracting airgap flux values from the flux command to provide a flux error, and a flux regulator for commanding firing angle control of the switches in a manner to drive the flux error to zero.
Claim 24
Dependent Claim
42 words
The system of claim 20 wherein the controller is configured to obtain a speed signal from a prime mover mechanically coupled to the wound field synchronous machine and to use the speed signal to adjust a gain schedule of the voltage regulator.
Claim 25
Dependent Claim
31 words
The system of claim 11 wherein the controller is configured for using the airgap flux values for firing angle control of switches of the phase controlled rectifier with dead-beat flux control.
Claim 26
Dependent Claim
31 words
The system of claim 11 wherein the controller is configured for using the airgap flux values for firing angle control of switches of the phase controlled rectifier with time-averaged flux control.
Claim 27
Dependent Claim
91 words
A wound field synchronous machine control system comprising: (a) a voltage sensor for obtaining a voltage signal from the wound field synchronous machine; (b) a phase controlled rectifier ( 20 ) for rectifying AC voltage and supplying rectified DC voltage to the wound field synchronous machine; (c) a controller for using the voltage signal to obtain volt-second values, obtaining airgap flux values of the wound field synchronous machine, and using the volt-second values and airgap flux values for firing angle control of switches ( 44 ) of the phase controlled rectifier.
Claim 28
Dependent Claim
91 words
A wound field synchronous machine control system comprising: (a) a voltage sensor for obtaining a voltage signal from the wound field synchronous machine; (b) a phase controlled rectifier ( 20 ) for rectifying AC voltage and supplying rectified DC voltage to the wound field synchronous machine; (c) a controller for using the voltage signal to obtain volt-second values, obtaining airgap flux values of the wound field synchronous machine, and using the volt-second values and airgap flux values for firing angle control of switches ( 44 ) of the phase controlled rectifier.
Claim 29
Dependent Claim
105 words
A wound field synchronous machine control system comprising: (a) alternating current (AC) voltage sensors for sensing AC phase voltage signals from the machine; (b) a phase controlled rectifier for rectifying the AC phase voltages and supplying rectified DC voltage; (c) a direct current (DC) voltage sensor for sensing a DC voltage signal from the rectifier; and (d) a controller for selectively using the AC phase voltage signals and the DC voltage signal to estimate a DC load voltage signal, obtaining a difference between a load voltage command and the estimated DC load voltage signal, and using the difference for controlling operation of the synchronous machine.
Claim 30
Dependent Claim
105 words
A wound field synchronous machine control system comprising: (a) alternating current (AC) voltage sensors for sensing AC phase voltage signals from the machine; (b) a phase controlled rectifier for rectifying the AC phase voltages and supplying rectified DC voltage; (c) a direct current (DC) voltage sensor for sensing a DC voltage signal from the rectifier; and (d) a controller for selectively using the AC phase voltage signals and the DC voltage signal to estimate a DC load voltage signal, obtaining a difference between a load voltage command and the estimated DC load voltage signal, and using the difference for controlling operation of the synchronous machine.
Claim 31
Dependent Claim
48 words
The system of claim 25 wherein the controller is configured to obtain an AC derived voltage estimate for comparison with the DC voltage signal and, when the DC voltage signal exceeds the AC derived voltage estimate, use the AC derived voltage estimate as the DC load voltage signal.
Claim 32
Dependent Claim
114 words
A wound field synchronous machine control method comprising: (a) obtaining auxiliary AC voltage of the wound field synchronous machine from terminals of an auxiliary windings; (b) rectifying the auxiliary AC voltage and supplying rectified DC voltage to a field winding of the wound field synchronous machine; and (c) using a voltage signal across the terminals of the auxiliary winding to obtain volt-second values of the auxiliary winding, wherein rectifying comprises using the volt-second values, wherein using the voltage signal across the auxiliary winding to obtain volt-second values of the auxiliary winding comprises using the voltage signal to measure voltage integrals, and using the voltage integrals to detect zero crossings and obtain the volt-second values.
Claim 33
Dependent Claim
114 words
A wound field synchronous machine control method comprising: (a) obtaining auxiliary AC voltage of the wound field synchronous machine from terminals of an auxiliary windings; (b) rectifying the auxiliary AC voltage and supplying rectified DC voltage to a field winding of the wound field synchronous machine; and (c) using a voltage signal across the terminals of the auxiliary winding to obtain volt-second values of the auxiliary winding, wherein rectifying comprises using the volt-second values, wherein using the voltage signal across the auxiliary winding to obtain volt-second values of the auxiliary winding comprises using the voltage signal to measure voltage integrals, and using the voltage integrals to detect zero crossings and obtain the volt-second values.
Claim 34
Dependent Claim
32 words
The method of claim 27 wherein using the voltage integrals to detect zero crossings comprises using two integrations, each integration corresponding to a respective positive or negative polarities of the voltage signal.
Claim 35
Dependent Claim
34 words
The method of claim 28 further comprising, upon detection of a potential zero crossing in one of the positive and negative polarities, beginning an integration for the other of the positive and negative polarities.
Claim 36
Dependent Claim
35 words
The method of claim 27 wherein using the voltage signal to measure voltage integrals comprises using the voltage signal to measure the voltage integrals in rectified half cycles of a waveform of the voltage signal.
Claim 37
Dependent Claim
22 words
The method of claim 30 further comprising using the zero-crossings to obtain a timing signal for synchronizing and resetting the voltage integrals.
Claim 38
Dependent Claim
46 words
A control method comprising: (a) obtaining a voltage signal across a winding; (b) using the voltage signal to measure voltage integrals; and (c) using the voltage integrals to detect zero crossings, obtain volt-second values, and synchronize firing angle control of switches of a phase controlled rectifier.
Claim 39
Dependent Claim
46 words
A control method comprising: (a) obtaining a voltage signal across a winding; (b) using the voltage signal to measure voltage integrals; and (c) using the voltage integrals to detect zero crossings, obtain volt-second values, and synchronize firing angle control of switches of a phase controlled rectifier.
Claim 40
Dependent Claim
32 words
The method of claim 32 wherein using the voltage integrals to detect zero crossings comprises using two integrations, each integration corresponding to a respective positive or negative polarity of the voltage signal.
Claim 41
Dependent Claim
34 words
The method of claim 33 further comprising, upon detection of a potential zero crossing in one of the positive and negative polarities, beginning an integration for the other of the positive and negative polarities.
Claim 42
Dependent Claim
65 words
A wound field synchronous machine control method comprising: (a) obtaining auxiliary AC voltage of the wound field synchronous machine from terminals of an auxiliary winding; (b) rectifying the auxiliary AC voltage and supplying rectified DC voltage to a field winding the wound field synchronous machine; and (c) obtaining airgap flux values of the wound field synchronous machine, wherein rectifying comprises using the airgap flux values.
Claim 43
Dependent Claim
65 words
A wound field synchronous machine control method comprising: (a) obtaining auxiliary AC voltage of the wound field synchronous machine from terminals of an auxiliary winding; (b) rectifying the auxiliary AC voltage and supplying rectified DC voltage to a field winding the wound field synchronous machine; and (c) obtaining airgap flux values of the wound field synchronous machine, wherein rectifying comprises using the airgap flux values.
Claim 44
Dependent Claim
22 words
The method of claim 35 wherein obtaining airgap flux values of the wound field synchronous machine comprises using current feedback sensor measurements.
Claim 45
Dependent Claim
28 words
The method of claim 36 wherein obtaining airgap flux values of the wound field synchronous machine further comprises using DC load current measurements and field winding current measurements.
Claim 46
Dependent Claim
23 words
The method of claim 37 wherein obtaining airgap flux values of the wound field synchronous machine further comprises using a load saturation model.
Claim 47
Dependent Claim
22 words
The method of claim 37 wherein obtaining airgap flux values of the wound field synchronous machine further comprises using a flux function.
Claim 48
Dependent Claim
24 words
The method of claim 35 wherein obtaining airgap flux values of the wound field synchronous machine comprises using current and voltage feedback sensor measurements.
Claim 49
Dependent Claim
36 words
The method of claim 40 wherein obtaining airgap flux values of the wound field synchronous machine further comprises using current feedback sensor measurements for low frequency operation and voltage feedback sensor measurements for higher frequency operation.
Claim 50
Dependent Claim
37 words
The method of claim 35 further comprising obtaining a feedforward flux command in response to changes in a load voltage command and wherein rectifying comprises using the feedforward flux command in combination with the airgap flux values.
Claim 51
Dependent Claim
35 words
The method of claim 35 further comprising obtaining a state feedback decoupling flux signal in response to state changes and wherein rectifying comprises using the feedback decoupling flux signal in combination with the airgap flux.
Claim 52
Dependent Claim
47 words
The method of claim 35 wherein using the airgap flux values comprises generating a flux command, subtracting airgap flux values from the flux command to provide a flux error, and commanding firing angle control of rectifier switches in a manner to drive the flux error to zero.
Claim 53
Dependent Claim
34 words
The method of claim 44 further comprising obtaining a speed signal from a prime mover mechanically coupled to the wound field synchronous machine and wherein generating the flux command comprises using the speed signal.
Claim 54
Independent Claim
113 words
A method for observing flux in a wound field synchronous machine coupled to a direct current load, the method comprising sensing machine field and direct current load currents and using the sense machine field and direct current load currents to provide a magnetizing flux estimate, wherein using the sensed machine field and direct current load currents comprises using a load saturation model for receiving the sensed machine field and direct current load currents and providing a preliminary magnetizing flux estimate, receiving a direct axis machine auxiliary current and providing an auxiliary current correction factor, and summing the preliminary magnetizing flux estimate and the auxiliary current correction factor to obtain the magnetizing flux estimate.
Claim 55
Independent Claim
113 words
A method for observing flux in a wound field synchronous machine coupled to a direct current load, the method comprising sensing machine field and direct current load currents and using the sense machine field and direct current load currents to provide a magnetizing flux estimate, wherein using the sensed machine field and direct current load currents comprises using a load saturation model for receiving the sensed machine field and direct current load currents and providing a preliminary magnetizing flux estimate, receiving a direct axis machine auxiliary current and providing an auxiliary current correction factor, and summing the preliminary magnetizing flux estimate and the auxiliary current correction factor to obtain the magnetizing flux estimate.
Claim 56
Dependent Claim
66 words
A wound field synchronous machine control method comprising: (a) obtaining a voltage signal from the wound field synchronous machine; (b) rectifying AC voltage and supplying rectified DC voltage to the wound field synchronous machine; (c) using the voltage signal to obtain volt-second values; and (d) obtaining airgap flux values of the wound field synchronous machine, wherein rectifying comprises using the volt-second values and airgap flux values.
Claim 57
Dependent Claim
66 words
A wound field synchronous machine control method comprising: (a) obtaining a voltage signal from the wound field synchronous machine; (b) rectifying AC voltage and supplying rectified DC voltage to the wound field synchronous machine; (c) using the voltage signal to obtain volt-second values; and (d) obtaining airgap flux values of the wound field synchronous machine, wherein rectifying comprises using the volt-second values and airgap flux values.
Claim 58
Dependent Claim
88 words
A wound field synchronous machine control method comprising: (a) sensing AC phase voltage signals from the machine; (b) rectifying the AC phase voltages and supplying rectified DC voltage; (c) sensing a DC voltage signal from the supplied rectified DC voltage; (d) selectively using the AC phase voltage signals and the DC voltage signal to estimate a DC load voltage signal; (e) obtaining a difference between a load voltage command and the estimated DC load voltage signal; and (f) using the difference for controlling operation of the synchronous machine.
Claim 59
Dependent Claim
88 words
A wound field synchronous machine control method comprising: (a) sensing AC phase voltage signals from the machine; (b) rectifying the AC phase voltages and supplying rectified DC voltage; (c) sensing a DC voltage signal from the supplied rectified DC voltage; (d) selectively using the AC phase voltage signals and the DC voltage signal to estimate a DC load voltage signal; (e) obtaining a difference between a load voltage command and the estimated DC load voltage signal; and (f) using the difference for controlling operation of the synchronous machine.
Claim 60
Dependent Claim
63 words
The method of claim 48 wherein selectively using the AC phase voltage signals and the DC voltage signal to estimate the DC load voltage signal comprises obtaining an AC derived voltage estimate for comparison with the DC voltage signal and, when the DC voltage signal exceeds the AC derived voltage estimate using the AC derived voltage estimate as the DC load voltage signal.
Claim 61
Dependent Claim
94 words
A traction vehicle comprising: (a) a wound field synchronous machine; and (b) a wound filed synchronous machine control system comprising: (i) an auxiliary winding for obtaining auxiliary AC voltage from the wound field synchronous machine, (ii) a phase controlled rectifier for rectifying the auxiliary AC voltage and supplying rectified DC voltage to the wound field synchronous machine, and (iii) a controller for using a voltage signal across the auxiliary winding to obtain volt-second values of the auxiliary winding and using the volt-second values for firing angle control of switches of the phase controlled rectifier.
Claim 62
Dependent Claim
94 words
A traction vehicle comprising: (a) a wound field synchronous machine; and (b) a wound filed synchronous machine control system comprising: (i) an auxiliary winding for obtaining auxiliary AC voltage from the wound field synchronous machine, (ii) a phase controlled rectifier for rectifying the auxiliary AC voltage and supplying rectified DC voltage to the wound field synchronous machine, and (iii) a controller for using a voltage signal across the auxiliary winding to obtain volt-second values of the auxiliary winding and using the volt-second values for firing angle control of switches of the phase controlled rectifier.
Claim 63
Dependent Claim
89 words
A traction vehicle comprising: (a) a wound field synchronous machine; and (b) a wound field synchronous machine control system comprising (i) an auxiliary winding for obtaining auxiliary AC voltage from the wound field synchronous machine, (ii) a phase controlled rectifier for rectifying the auxiliary AC voltage and supplying rectified DC voltage to the wound field synchronous machine, and (iii) a controller for obtaining airgap flux values of the wound field synchronous machine and using the airgap flux values for firing angle control of switches of the phase controlled rectifier.
Claim 64
Dependent Claim
89 words
A traction vehicle comprising: (a) a wound field synchronous machine; and (b) a wound field synchronous machine control system comprising (i) an auxiliary winding for obtaining auxiliary AC voltage from the wound field synchronous machine, (ii) a phase controlled rectifier for rectifying the auxiliary AC voltage and supplying rectified DC voltage to the wound field synchronous machine, and (iii) a controller for obtaining airgap flux values of the wound field synchronous machine and using the airgap flux values for firing angle control of switches of the phase controlled rectifier.
Claim 65
Dependent Claim
23 words
The traction vehicle of claim 51 wherein the controller is configured to use current feedback sensor measurements to obtain the airgap flux values.
Claim 66
Dependent Claim
46 words
The traction vehicle of claim 52 further comprising a DC load current ( 46 ) sensor and a field winding current sensor, and wherein the controller is configured to use measurements from the DC load and field winding current sensors to obtain the airgap flux values.
Claim 67
Dependent Claim
25 words
The traction vehicle of claim 51 wherein the controller is configured to use current and voltage feedback sensor measurements to obtain the airgap flux values.
Claim 68
Dependent Claim
159 words
A traction vehicle comprising: (a) a wound field synchronous machine; and (b) a wound field synchronous machine control system comprising (i) alternating current (AC) voltage sensors for sensing AC phase voltage signals from the machine, (ii) a rectifier for rectifying the AC phase voltages and supplying rectifier DC voltage, (iii) a direct current (DC) voltage sensor for sensing a DC voltage signal from the rectifier; and (iv) a controller for selectively using the AC phase voltage signals and the DC voltage signal to estimate a DC load voltage signal , obtaining a difference between a load voltage command and the estimated DC load voltage signal, and using the difference for controlling operation of the synchronous machine, wherein the controller is configured to obtain an AC derived voltage estimate for comparison with the DC voltage signal and, when the DC voltage signal exceeds the AC derived voltage estimate, use the AC derived voltage estimate as the DC load voltage signal.
Claim 69
Dependent Claim
159 words
A traction vehicle comprising: (a) a wound field synchronous machine; and (b) a wound field synchronous machine control system comprising (i) alternating current (AC) voltage sensors for sensing AC phase voltage signals from the machine, (ii) a rectifier for rectifying the AC phase voltages and supplying rectifier DC voltage, (iii) a direct current (DC) voltage sensor for sensing a DC voltage signal from the rectifier; and (iv) a controller for selectively using the AC phase voltage signals and the DC voltage signal to estimate a DC load voltage signal , obtaining a difference between a load voltage command and the estimated DC load voltage signal, and using the difference for controlling operation of the synchronous machine, wherein the controller is configured to obtain an AC derived voltage estimate for comparison with the DC voltage signal and, when the DC voltage signal exceeds the AC derived voltage estimate, use the AC derived voltage estimate as the DC load voltage signal.
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