Patent US5144564A successfully refreshed from Google Patents.
US5144564A
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Rotor position estimation of a permanent magnet synchronous-machine for high performance drive
Assignee: University of Tennessee Research Foundation
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Filing: 1991-01-08
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Granted: 1992-09-01
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Expires: 2011-01-08
Abstract
Abstract The invention comprises an apparatus and a method for controlling permanent magnet AC machines. Stator voltages and stator currents are sensed to produce signals which are utilized by a digital circuit to calculate control signals for the machine.
Inventors
- 👤 Malakondaiah Naidu
- 👤 Bimal K. Bose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:42
CPC Classifications
H; H02; H02P; H02P6/00; H02P6/14; H02P6/16; H02P6/18; H02P21/00; H02P21/14; H02P21/18; H02P6/17
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
155 words
A method for controlling a permanent magnet synchronous machine including a stator having at least three windings such that said permanent magnet synchronous machine rotates in a desired direction at a desired speed, including the steps of: a) electrically determining if a rotor of said machine is stationary to generate a zero rotation state signal; b) selectively applying electrical signals to said stator in response to said zero rotation state signal to generate a stationary rotor position signal; c) measuring the operating voltages applied to and the operating currents flowing in said stator windings and in response thereto calculating a rotational velocity signal and a rotor position signal; and d) utilizing said zero rotation state signal, said stationary rotor position signal, said rotor position signal and said rotational velocity signal to control said operating voltages applied to said stator windings to cause said rotor to rotate in the desired direction and at the desired speed.
Claim 2
Independent Claim
155 words
A method for controlling a permanent magnet synchronous machine including a stator having at least three windings such that said permanent magnet synchronous machine rotates in a desired direction at a desired speed, including the steps of: a) electrically determining if a rotor of said machine is stationary to generate a zero rotation state signal; b) selectively applying electrical signals to said stator in response to said zero rotation state signal to generate a stationary rotor position signal; c) measuring the operating voltages applied to and the operating currents flowing in said stator windings and in response thereto calculating a rotational velocity signal and a rotor position signal; and d) utilizing said zero rotation state signal, said stationary rotor position signal, said rotor position signal and said rotational velocity signal to control said operating voltages applied to said stator windings to cause said rotor to rotate in the desired direction and at the desired speed.
Claim 3
Dependent Claim
41 words
The method in accordance with claim 1 wherein the step of selectively applying electrical signals to said stator in response to said zero rotation state signal includes the additional step of connecting at least two of said stator windings in parallel.
Claim 4
Dependent Claim
37 words
The method in accordance with claim 2 further including the step of generating first digital signals corresponding to the stator voltages and the stator currents and utilizing said first digital signals to calculate said stationary rotor position.
Claim 5
Dependent Claim
58 words
The method in accordance with claim 3 wherein said step measuring the operating voltages applied to and the operating currents flowing in said stator windings further includes the step of producing second digital signals corresponding to said operating voltages and said operating currents and utilizing these signals to calculate said rotational velocity signal and said rotor position signal.
Claim 6
Dependent Claim
166 words
A controller for a permanent magnet synchronous machine having at least three stator windings, comprising in combination: a) first means for determining the rotational state of a rotor of said machine to generate a zero rotation state signal; b) second means responsive to said zero rotation state signal to selectively apply electrical signals to said rotor such that said rotor remains stationary and for measuring the voltage applied to and the currents flowing in said stator windings to produce first voltage and first current signals; c) third means selectively responsive to said first voltage and first current signals to generate a rotor position signal; d) fourth means responsive to a second voltage applied to and the currents flowing in said stator winding to generator a rotor velocity signal; and d) fifth means responsive to said rotor position and rotor velocity signals to control said second voltage applied to said stator windings to cause said rotor to rotate in a desired direction and at a desired velocity.
Claim 7
Dependent Claim
166 words
A controller for a permanent magnet synchronous machine having at least three stator windings, comprising in combination: a) first means for determining the rotational state of a rotor of said machine to generate a zero rotation state signal; b) second means responsive to said zero rotation state signal to selectively apply electrical signals to said rotor such that said rotor remains stationary and for measuring the voltage applied to and the currents flowing in said stator windings to produce first voltage and first current signals; c) third means selectively responsive to said first voltage and first current signals to generate a rotor position signal; d) fourth means responsive to a second voltage applied to and the currents flowing in said stator winding to generator a rotor velocity signal; and d) fifth means responsive to said rotor position and rotor velocity signals to control said second voltage applied to said stator windings to cause said rotor to rotate in a desired direction and at a desired velocity.
Claim 8
Dependent Claim
15 words
A controller in accordance with claim 5 wherein said third means is a digital computer.
Claim 9
Dependent Claim
13 words
A controller in accordance with claim 6 wherein said digital computer is programmable.
Claim 10
Dependent Claim
17 words
A controller in accordance with claim 7 wherein said fourth means is also a programmable digital computer.
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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) | 1995-09-01 | 1996-03-02 | 1996-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-01 | 2000-03-02 | 2000-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-01 | 2004-03-02 | 2004-09-01 | $7700.00 | Window Closed / Lapsed |