US20030197490A1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wound field synchronous machine control system and method
Assignee: Transportation IP Holdings LLC
•
Filing: 2003-05-02
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Granted: —
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Expires: 2023-05-02
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 Garrigan
- 👤 Henry Young
- 👤 Bradley Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:15
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: 81
Claim 1
Independent Claim
84 words
1 . 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
84 words
1 . 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
45 words
2 . 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
39 words
3 . 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
40 words
4 . 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
35 words
5 . 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
30 words
6 . 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
30 words
7 . 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
67 words
8 . 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
67 words
8 . 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
39 words
9 . 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
39 words
10 . 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
78 words
11 . 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
78 words
11 . 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
24 words
12 . 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
44 words
13 . 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
24 words
14 . 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
23 words
15 . 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
26 words
16 . 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
31 words
17 . 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
53 words
18 . 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
52 words
19 . 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
59 words
20 . 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
44 words
21 . 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
33 words
22 . 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
33 words
23 . 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
38 words
24 . A flux observer for a wound field synchronous machine coupled to a direct current load, the flux observer being configured to use sensed machine field and direct current load currents to provide a magnetizing flux estimate.
Claim 28
Dependent Claim
38 words
24 . A flux observer for a wound field synchronous machine coupled to a direct current load, the flux observer being configured to use sensed machine field and direct current load currents to provide a magnetizing flux estimate.
Claim 29
Dependent Claim
31 words
25 . The flux observer of claim 24 further comprising a load saturation model for receiving the sensed machine field and direct current load currents and providing the magnetizing flux estimate.
Claim 30
Dependent Claim
72 words
26 . The flux observer of claim 24 further comprising a load saturation model for receiving the sensed machine field and direct current load currents and providing a preliminary magnetizing flux estimate; and a correction function for receiving a direct axis machine auxiliary current and providing an auxiliary current correction factor; a summation element using the preliminary magnetizing flux estimate and the auxiliary current correction factor to obtain the magnetizing flux estimate.
Claim 31
Dependent Claim
93 words
27 . 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 32
Dependent Claim
93 words
27 . 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 33
Dependent Claim
107 words
28 . 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 34
Dependent Claim
107 words
28 . 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 35
Dependent Claim
50 words
29 . The system of claim 28 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 36
Dependent Claim
88 words
30 . 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 to a load; and (c) a controller for using the AC phase voltage signals 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 37
Dependent Claim
88 words
30 . 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 to a load; and (c) a controller for using the AC phase voltage signals 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 38
Dependent Claim
76 words
31 . 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 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.
Claim 39
Dependent Claim
76 words
31 . 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 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.
Claim 40
Dependent Claim
47 words
32 . The method of claim 31 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 41
Dependent Claim
34 words
33 . 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 polarities of the voltage signal.
Claim 42
Dependent Claim
36 words
34 . 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 43
Dependent Claim
37 words
35 . The method of claim 32 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 44
Dependent Claim
24 words
36 . The method of claim 35 further comprising using the zero-crossings to obtain a timing signal for synchronizing and resetting the voltage integrals.
Claim 45
Dependent Claim
48 words
37 . 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 46
Dependent Claim
48 words
37 . 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 47
Dependent Claim
34 words
38 . The method of claim 37 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 48
Dependent Claim
36 words
39 . The method of claim 38 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 49
Dependent Claim
67 words
40 . 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 50
Dependent Claim
67 words
40 . 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 51
Dependent Claim
24 words
41 . The method of claim 40 wherein obtaining airgap flux values of the wound field synchronous machine comprises using current feedback sensor measurements.
Claim 52
Dependent Claim
30 words
42 . The method of claim 41 wherein obtaining airgap flux values of the wound field synchronous machine further comprises using DC load current measurements and field winding current measurements.
Claim 53
Dependent Claim
25 words
43 . The method of claim 42 wherein obtaining airgap flux values of the wound field synchronous machine further comprises using a load saturation model.
Claim 54
Dependent Claim
24 words
44 . The method of claim 42 wherein obtaining airgap flux values of the wound field synchronous machine further comprises using a flux function.
Claim 55
Dependent Claim
26 words
45 . The method of claim 40 wherein obtaining airgap flux values of the wound field synchronous machine comprises using current and voltage feedback sensor measurements.
Claim 56
Dependent Claim
38 words
46 . The method of claim 45 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 57
Dependent Claim
39 words
47 . The method of claim 40 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 58
Dependent Claim
37 words
48 . The method of claim 40 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 59
Dependent Claim
49 words
49 . The method of claim 40 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 60
Dependent Claim
36 words
50 . The method of claim 49 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 61
Dependent Claim
47 words
51 . 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 sensed machine field and direct current load currents to provide a magnetizing flux estimate.
Claim 62
Dependent Claim
47 words
51 . 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 sensed machine field and direct current load currents to provide a magnetizing flux estimate.
Claim 63
Dependent Claim
41 words
52 . The method of claim 51 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 the magnetizing flux estimate.
Claim 64
Dependent Claim
75 words
53 . The method of claim 51 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 65
Dependent Claim
68 words
54 . 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 66
Dependent Claim
68 words
54 . 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 67
Dependent Claim
90 words
55 . 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 68
Dependent Claim
90 words
55 . 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 69
Dependent Claim
65 words
56 . The method of claim 55 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 70
Dependent Claim
75 words
57 . 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 to a load; (c) using the AC phase voltage signals to estimate a DC load voltage signal; (d) obtaining a difference between a load voltage command and the estimated DC load voltage signal; and (e) using the difference for controlling operation of the synchronous machine.
Claim 71
Dependent Claim
75 words
57 . 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 to a load; (c) using the AC phase voltage signals to estimate a DC load voltage signal; (d) obtaining a difference between a load voltage command and the estimated DC load voltage signal; and (e) using the difference for controlling operation of the synchronous machine.
Claim 72
Dependent Claim
96 words
58 . 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 73
Dependent Claim
96 words
58 . 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 74
Dependent Claim
91 words
59 . 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 75
Dependent Claim
91 words
59 . 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 76
Dependent Claim
25 words
60 . The traction vehicle of claim 59 wherein the controller is configured to use current feedback sensor measurements to obtain the airgap flux values.
Claim 77
Dependent Claim
48 words
61 . The traction vehicle of claim 60 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 78
Dependent Claim
27 words
62 . The traction vehicle of claim 59 wherein the controller is configured to use current and voltage feedback sensor measurements to obtain the airgap flux values.
Claim 79
Dependent Claim
117 words
63 . 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 rectified 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.
Claim 80
Dependent Claim
117 words
63 . 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 rectified 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.
Claim 81
Dependent Claim
51 words
64 . The traction vehicle of claim 63 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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