Patent US6429616B1 successfully refreshed from Google Patents.
US6429616B1
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Method of estimating the DC bus voltage in electric machine drives
Assignee: Ford Global Technologies LLC
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Filing: 2001-03-29
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Granted: 2002-08-06
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Expires: 2021-03-29
Abstract
Abstract An electric machine drive system uses an estimation of the DC bus voltage to improve machine drive control. The DC bus voltage is estimated by injecting a carrier signal into the machine drive and determining the magnitude of the positive sequence current component induced in the drive by the carrier signal. The measured magnitude of current may be referenced to the anticipated magnitude of the current in order to produce an inverse value of the estimated DC bus voltage that is then used to normalize the commanded voltage signal driving the machine. Alternatively, a look-up table is used to relate the measured magnitude of the current component to a corresponding estimated value of the bus voltage.
Inventors
- 👤 Garold Paul Myers
- 👤 Michael W. Degner
- 👤 Michael Harke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:20
CPC Classifications
H; H02; H02P; H02P27/00; H02P27/04; H02P27/06; B; B60; B60L; B60L50/00; B60L50/50; B60L50/51; B60L58/00; B60L58/10; B60L2220/00; B60L2220/10; B60L2220/14; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64; Y02T10/70
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
97 words
A method of driving an electric machine system, comprising the steps of: (A) generating a commanded voltage signal; (B) injecting a carrier signal voltage at a frequency that is non-synchronous with the fundamental excitation into said system, said carrier signal voltage inducing a carrier signal current in said system having positive sequence current component; (C) determining the magnitude of said positive sequence current component; (D) estimating a DC bus voltage of said system using the magnitude determined in step (C); and, (E) normalizing said commanded voltage signal based on the DC bus voltage estimated in step (D).
Claim 2
Independent Claim
97 words
A method of driving an electric machine system, comprising the steps of: (A) generating a commanded voltage signal; (B) injecting a carrier signal voltage at a frequency that is non-synchronous with the fundamental excitation into said system, said carrier signal voltage inducing a carrier signal current in said system having positive sequence current component; (C) determining the magnitude of said positive sequence current component; (D) estimating a DC bus voltage of said system using the magnitude determined in step (C); and, (E) normalizing said commanded voltage signal based on the DC bus voltage estimated in step (D).
Claim 3
Dependent Claim
47 words
The method of claim 1 , including the step of determining the value difference between the magnitude determined in step (C) and an anticipated magnitude of said positive sequence current component, and wherein the DC bus voltage estimated in step (D) is based on said value difference.
Claim 4
Dependent Claim
22 words
The method of claim 2 , wherein step (D) is performed by operating on said value difference using proportional and integral gains.
Claim 5
Dependent Claim
39 words
The method of claim 1 , including the step of generating the inverse value of the DC bus voltage estimated in step (D), and wherein step (E) is performed by modifying said commanded voltage signal using said inverse value.
Claim 6
Dependent Claim
31 words
The method of claim 1 , including the step of filtering said positive sequence current component of said carrier signal voltage from a fundamental excitation signal used to drive said system.
Claim 7
Dependent Claim
29 words
The method of claim 1 including the step of extracting said positive sequence current component of said carrier signal voltage from the excitation signal used to drive said system.
Claim 8
Dependent Claim
25 words
The method of claim 6 , wherein said extracting includes rotating vectors representative of components of said excitation signal, and filtering certain of said components.
Claim 9
Dependent Claim
50 words
The method of claim 1 , including the steps of: sensing the excitation signal used to drive said system; filtering said carrier signal voltage from said sensed excitation signal to produce a feedback control signal; and modifying the command voltage signal based on the value of said feedback control signal.
Claim 10
Dependent Claim
14 words
The method of claim 1 , wherein step (B) is performed after step (E).
Claim 11
Dependent Claim
22 words
The method of claim 1 , wherein step (C) is performed by determining the absolute value of said positive sequence current component.
Claim 12
Dependent Claim
54 words
The method of claim 1 , wherein step (D) is performed by: storing a plurality of values of positive sequence current component values, and a plurality of respectively associated estimates of DC bus voltages, and looking up a stored value of positive sequence current component to determine the corresponding estimate of DC bus voltage.
Claim 13
Dependent Claim
30 words
The method of claim 1 , wherein step (D) is performed using a look-up table relating a plurality of positive sequence current values to corresponding estimates of DC bus voltages.
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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) | 2005-08-05 | 2006-02-04 | 2006-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-08-05 | 2010-02-04 | 2010-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-08-05 | 2014-02-04 | 2014-08-06 | $7700.00 | Window Closed / Lapsed |