US6998811B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compensation method for current-sensor gain errors
Assignee: Ford Global Technologies LLC
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Filing: 2003-02-10
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Granted: 2006-02-14
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Expires: 2023-02-10
Abstract
Abstract A method of compensation for current-sensor gain errors in an electric machine drive 14 includes a high frequency carrier signal electrically injected into the electric machine 14. A current-sensor signal of the electric machine 14 is determined. The current-sensor signal is separated into current-sensor carrier signal negative and current-sensor carrier signal positive sequence reference frames. A proportional compensator signal for one of the current-sensor carrier signal reference frames is generated in a feedback loop 24. A magnitude signal of another one of the current-sensor carrier signal reference frames is generated in a different feedback loop 26.
Inventors
- 👤 Garold P Myers
- 👤 Michael W. Degner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:07
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/5387; H02M7/53871; H02M7/53875; H02M1/00; H02M1/0003; H02M1/0009; H02M1/0025; H02M7/53876
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
111 words
A method of compensation for current-sensor gain errors in an electric machine drive comprising: activating the electric machine drive; electrically injecting a high frequency carrier signal into the electric machine; determining a current-sensor signal of the electric machine drive; separating said current-sensor signal into current-sensor carrier signal negative and current-sensor carrier signal positive sequence reference frame components; generating a proportional compensator signal for a first one of said current-sensor carrier signal reference frame components through a comparison of said first one of said current-sensor carrier signal reference frame components with a theoretical unit vector; and generating a magnitude signal of a second one of said current-sensor carrier signal reference frame components.
Claim 2
Independent Claim
111 words
A method of compensation for current-sensor gain errors in an electric machine drive comprising: activating the electric machine drive; electrically injecting a high frequency carrier signal into the electric machine; determining a current-sensor signal of the electric machine drive; separating said current-sensor signal into current-sensor carrier signal negative and current-sensor carrier signal positive sequence reference frame components; generating a proportional compensator signal for a first one of said current-sensor carrier signal reference frame components through a comparison of said first one of said current-sensor carrier signal reference frame components with a theoretical unit vector; and generating a magnitude signal of a second one of said current-sensor carrier signal reference frame components.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein electrically injecting a high frequency carrier signal further comprises injecting a voltage signal.
Claim 4
Dependent Claim
19 words
The method of claim 1 wherein electrically injecting a high frequency carrier signal further comprises injecting a current signal.
Claim 5
Dependent Claim
30 words
The method of claim 1 wherein separating further comprises separating said current-sensor signal into current-sensor carrier signal negative and current-sensor carrier signal positive sequence reference frame components through vector rotation.
Claim 6
Dependent Claim
50 words
The method of claim 1 wherein generating the proportional compensator signal further comprises generating the magnitude signal of a second one of said current-sensor carrier signal reference frame components through a comparison of the second one of said current-sensor carrier signal reference frame components with an anticipated sequence component command.
Claim 7
Dependent Claim
14 words
The method of claim 1 further comprising performing a transform on said current-sensor signal.
Claim 8
Dependent Claim
19 words
The method of claim 1 wherein separating further comprises filtering said current-sensor carrier signal negative sequence reference frame component.
Claim 9
Dependent Claim
19 words
The method of claim 1 wherein separating further comprises filtering said current-sensor carrier signal positive sequence reference frame component.
Claim 10
Dependent Claim
16 words
The method of claim 1 wherein determining the current-sensor signal further comprises conditioning said current-sensor signal.
Claim 11
Dependent Claim
16 words
The method of claim 1 wherein determining the current-sensor signal further comprises sensing said current-sensor signal.
Claim 12
Dependent Claim
150 words
A compensation system for current-sensor gain errors in an electric machine drive incorporating an injected high frequency carrier signal comprising: an inverter, electrically coupled to the electric machine and adapted to activate the electric machine; a current-sensor signal conditioner, electrically coupled to the electric machine, adapted to generate at least one current-sensor signal; and a controller, electrically coupled to the current-sensor signal conditioner and adapted to compensate for gain-error of said current-sensor signal conditioner, comprising a first feedback loop adapted to generate a proportional compensator signal from a negative sequence component of said current-sensor signal for said current-sensor signal conditioner, wherein said first feedback loon further comprises a comparison of a theoretical unit vector and said negative sequence component of said current-sensor signal, said controller further comprising a second feedback loop adapted to adjust a magnitude of said proportional compensator signal from a positive sequence component of said current-sensor signal.
Claim 13
Dependent Claim
150 words
A compensation system for current-sensor gain errors in an electric machine drive incorporating an injected high frequency carrier signal comprising: an inverter, electrically coupled to the electric machine and adapted to activate the electric machine; a current-sensor signal conditioner, electrically coupled to the electric machine, adapted to generate at least one current-sensor signal; and a controller, electrically coupled to the current-sensor signal conditioner and adapted to compensate for gain-error of said current-sensor signal conditioner, comprising a first feedback loop adapted to generate a proportional compensator signal from a negative sequence component of said current-sensor signal for said current-sensor signal conditioner, wherein said first feedback loon further comprises a comparison of a theoretical unit vector and said negative sequence component of said current-sensor signal, said controller further comprising a second feedback loop adapted to adjust a magnitude of said proportional compensator signal from a positive sequence component of said current-sensor signal.
Claim 14
Dependent Claim
12 words
The system of claim 11 wherein said electric machine comprises a motor.
Claim 15
Dependent Claim
15 words
The system of claim 11 wherein said current-sensor signal generator comprises a current-sensor signal conditioner.
Claim 16
Dependent Claim
13 words
The system of claim 11 wherein said current-sensor signal generator comprises a current-sensor.
Claim 17
Dependent Claim
27 words
The system of claim 11 wherein said second feedback loop further comprises a comparison of a component command and said positive sequence component of said current-sensor signal.
Claim 18
Independent Claim
138 words
A method of compensation for current-sensor gain errors in an electric machine drive comprising: activating the electric machine drive; electrically injecting a high frequency carrier signal into the electric machine; calculating a current-sensor signal of the electric machine drive; separating said current-sensor signal into current-sensor carrier signal negative and current-sensor carrier signal positive sequence reference frame components through vector rotation of said current-sensor signal; generating a proportional compensator signal for a first one of said current-sensor carrier signal reference frame components through a comparison of said first one of said current-sensor carrier signal reference frame components with a theoretical unit vector; and generating a magnitude signal of a second one of said current-sensor carrier signal reference frame components through a comparison of said second one of said current-sensor carrier signal reference frame components with a sequence component command.
Claim 19
Independent Claim
138 words
A method of compensation for current-sensor gain errors in an electric machine drive comprising: activating the electric machine drive; electrically injecting a high frequency carrier signal into the electric machine; calculating a current-sensor signal of the electric machine drive; separating said current-sensor signal into current-sensor carrier signal negative and current-sensor carrier signal positive sequence reference frame components through vector rotation of said current-sensor signal; generating a proportional compensator signal for a first one of said current-sensor carrier signal reference frame components through a comparison of said first one of said current-sensor carrier signal reference frame components with a theoretical unit vector; and generating a magnitude signal of a second one of said current-sensor carrier signal reference frame components through a comparison of said second one of said current-sensor carrier signal reference frame components with a sequence component command.
Claim 20
Dependent Claim
21 words
The method of claim 16 further comprising performing a transform on said current-sensor signal to obtain a transformed current sensor signal.
Claim 21
Dependent Claim
36 words
The system of claim 17 further comprising separating said transformed current-sensor carrier signal into transformed current-sensor carrier signal negative and transformed current-sensor carrier signal positive sequence reference frames through vector rotation of said transformed current-sensor signal.
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