Patent US6894454B2 successfully refreshed from Google Patents.
US6894454B2
Expired / Lapsed
US
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Position sensorless control algorithm for AC machine
Assignee: GM Global Technology Operations LLC
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Filing: 2002-10-10
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Granted: 2005-05-17
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Expires: 2022-10-10
Abstract
Abstract A control system for an electric motor including an inverter for providing power to the electric motor, a controller for controlling the inverter, a first motor speed control block in the controller injecting a high frequency signal into the electric motor to determine the speed and position of the electric motor, a second motor speed control block in the controller detecting the back electromotive force to determine the speed and position of the electric motor, and a transition control block in said controller to vary operation between the first motor speed control block and the second motor speed control block.
Inventors
- 👤 Nitinkumar R. Patel
- 👤 Steven E. Schulz
- 👤 James M. Nagashima
- 👤 Seung Ki Sul
- 👤 Yo-Chan Son
- 👤 Bon-Ho Bae
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:16
CPC Classifications
H; H02; H02P; H02P21/00; H02P21/24; H02P21/26; H02P21/32
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
100 words
A control system for an electric motor comprising: an inverter for providing power to the electric motor; a controller for controlling said inverter; a first motor speed control block in said controller injecting a high frequency signal into said electric motor to determine the speed and position of the electric motor; a second motor speed control block in said controller detecting the back electromotive force to determine the speed and position of the electric motor; and a transition control block in said controller to vary operation between said first motor speed control block and said second motor speed control block.
Claim 2
Dependent Claim
100 words
A control system for an electric motor comprising: an inverter for providing power to the electric motor; a controller for controlling said inverter; a first motor speed control block in said controller injecting a high frequency signal into said electric motor to determine the speed and position of the electric motor; a second motor speed control block in said controller detecting the back electromotive force to determine the speed and position of the electric motor; and a transition control block in said controller to vary operation between said first motor speed control block and said second motor speed control block.
Claim 3
Dependent Claim
14 words
The control system of claim 1 wherein said electric motor is an induction motor.
Claim 4
Dependent Claim
16 words
The control system of claim 1 wherein said electric motor is an interior permanent magnet motor.
Claim 5
Dependent Claim
15 words
The control system of claim 1 wherein said electric motor is a synchronous reluctance motor.
Claim 6
Dependent Claim
14 words
The control system of claim 1 wherein said electric motor is a three-phase motor.
Claim 7
Dependent Claim
20 words
The control system of claim 1 wherein said injected high frequency signal is in the range of substantially 300-1000 Hz.
Claim 8
Dependent Claim
24 words
The control system of claim 1 wherein said transition block operates said first motor speed control block below ten percent of rated machine speed.
Claim 9
Dependent Claim
23 words
The control system of claim 1 wherein said transition block operates said second motor control speed above five percent of rated machine speed.
Claim 10
Independent Claim
71 words
A method of controlling an electric motor comprising: injecting a high frequency signal into said motor at a first speed; processing feedback generated by the injected high frequency signal to determine the position of a rotor in the electric motor at the first speed; determining the speed of the electric motor; and determining the position of the rotor in the electric motor based on back electromotive force at a second speed.
Claim 11
Independent Claim
71 words
A method of controlling an electric motor comprising: injecting a high frequency signal into said motor at a first speed; processing feedback generated by the injected high frequency signal to determine the position of a rotor in the electric motor at the first speed; determining the speed of the electric motor; and determining the position of the rotor in the electric motor based on back electromotive force at a second speed.
Claim 12
Dependent Claim
49 words
The method of claim 9 further comprising the step of transitioning between processing the feedback generated by the injected high frequency signal to determine the position of the rotor at a first speed and determining the position of the rotor based on back electromotive force at a second speed.
Claim 13
Dependent Claim
22 words
The method of claim 10 further comprising the step of determining the rotor position of the electric motor in a static state.
Claim 14
Dependent Claim
130 words
A powertrain for a vehicle comprising: an electric motor functionally coupled to at least one wheel in the vehicle; an inverter electrically coupled to said electric motor; a DC voltage source electrically coupled to said inverter; a controller for controlling the output of said inverter to provide electrical current to said electric motor; a first motor control module in said controller injecting a high frequency signal into said electric motor to determine the speed and position of the electric motor; a second motor control module in said controller detecting the back electro-motive force to determine the speed and position of the electric motor; and a transition control module in said controller to vary operation between said first motor control module and said second motor control module based upon motor speed.
Claim 15
Dependent Claim
130 words
A powertrain for a vehicle comprising: an electric motor functionally coupled to at least one wheel in the vehicle; an inverter electrically coupled to said electric motor; a DC voltage source electrically coupled to said inverter; a controller for controlling the output of said inverter to provide electrical current to said electric motor; a first motor control module in said controller injecting a high frequency signal into said electric motor to determine the speed and position of the electric motor; a second motor control module in said controller detecting the back electro-motive force to determine the speed and position of the electric motor; and a transition control module in said controller to vary operation between said first motor control module and said second motor control module based upon motor speed.
Claim 16
Dependent Claim
13 words
The powertrain of claim 12 wherein said electric motor is an induction motor.
Claim 17
Dependent Claim
15 words
The powertrain of claim 12 wherein said electric motor is an interior permanent magnet motor.
Claim 18
Dependent Claim
14 words
The powertrain of claim 12 wherein said electric motor is a synchronous reluctance motor.
Claim 19
Dependent Claim
13 words
The powertrain of claim 12 wherein said electric motor is a three-phase motor.
Claim 20
Dependent Claim
29 words
The powertrain of claim 12 wherein said transition module varies operation between said first control module and said second control module base on the speed of the electric motor.
Claim 21
Dependent Claim
15 words
The powertrain of claim 12 wherein the electric motor includes an interior permanent magnet rotor.
Claim 22
Dependent Claim
34 words
The powertrain of claim 18 further comprising a rotor angular position estimation module in said controller to determine the polarity of said interior permanent magnet rotor of the electric motor in a static condition.
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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) | 2008-05-16 | 2008-11-15 | 2009-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2012-05-16 | 2012-11-15 | 2013-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2016-05-16 | 2016-11-15 | 2017-05-17 | $7700.00 | Window Closed / Lapsed |