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Patent US7342379B2 successfully refreshed from Google Patents.
US7342379B2
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US
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Sensorless control systems and methods for permanent magnet rotating machines
Assignee: EMERSUB CXIII, INC.
•
Filing: 2005-12-02
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Granted: 2008-03-11
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Expires: 2025-12-02
Abstract
Abstract Systems and methods for controlling a rotating electromagnetic machine. The rotating machine, such as a permanent magnet motor or hybrid switched reluctance motor, includes a stator having a plurality of phase windings and a rotor that rotates relative to the stator. A drive is connected to the phase windings for energizing the windings. A controller outputs a control signal to the drive in response to an input demand such as a demanded speed or torque. Control methods (which can be implemented separately or in combination) include varying the gain of an estimator as a function of a demanded or estimated speed to position control system poles at desired locations, decoupling control system currents to achieve a constant torque with motor speed, compensating flux estimates of the estimator for saturation operation of the stator, estimating rotor position using averages of sample values of energization feedback, and calculating a trim adjusted speed error from a plurality of speed estimates.
Inventors
- 👤 Joseph G. Marcinkiewicz
- 👤 Prakash B. Shahi
- 👤 Michael I. Henderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:41
CPC Classifications
H; H02; H02P; H02P6/00; H02P6/14; H02P6/16; H02P6/18; H02P25/00; H02P25/02; H02P25/08
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
81 words
A method of controlling a permanent magnet rotating machine, the machine including a stator and a rotor situated to rotate relative to the stator, the stator having a plurality of energizable phase windings situated therein, and an estimator having at least one gain value and employing an observer, the method comprising: varying the gain of the estimator as a function of either a demanded rotor speed or an estimated rotor speed to thereby position poles of the observer at desired locations.
Claim 2
Independent Claim
81 words
A method of controlling a permanent magnet rotating machine, the machine including a stator and a rotor situated to rotate relative to the stator, the stator having a plurality of energizable phase windings situated therein, and an estimator having at least one gain value and employing an observer, the method comprising: varying the gain of the estimator as a function of either a demanded rotor speed or an estimated rotor speed to thereby position poles of the observer at desired locations.
Claim 3
Dependent Claim
20 words
The method of claim 1 wherein varying includes varying the estimator gain while operating in a closed loop control mode.
Claim 4
Dependent Claim
51 words
The method of claim 1 wherein varying includes varying the estimator gain with respect to the demanded rotor speed when the actual rotor speed is outside a predefined range, and varying the estimator gain with respect to the estimated electrical speed when the actual rotor speed is within the predefined range.
Claim 5
Dependent Claim
17 words
The method of claim 1 further comprising calculating estimator gains for one or more rotor speed ranges.
Claim 6
Dependent Claim
23 words
The method of claim 4 wherein the one or more rotor speed ranges excludes a range of rotor speeds around a zero speed.
Claim 7
Dependent Claim
17 words
The method of claim 1 wherein varying includes retrieving gain values from a lookup table or equation.
Claim 8
Dependent Claim
26 words
The method of claim 1 wherein varying includes varying the gain of the estimator as a function of a filtered version of the demanded rotor speed.
Claim 9
Dependent Claim
33 words
The method of claim 1 wherein varying includes varying the gain of the estimator as a function of a filtered version of the estimated rotor speed during a torque control mode of operation.
Claim 10
Dependent Claim
17 words
A permanent magnet rotating machine and controller assembly configured to perform the method of claim 1 .
Claim 11
Dependent Claim
11 words
A climate control system comprising the assembly of claim 9 .
Claim 12
Dependent Claim
22 words
The climate control system of claim 10 wherein the system includes an air handler and wherein the air handler includes said assembly.
Claim 13
Independent Claim
69 words
A method of controlling a permanent magnet rotating machine, the machine including a stator and a rotor situated to rotate relative to the stator, the stator having a plurality of energizable phase windings situated therein, the method comprising: determining a value of dr-axis current to be injected; and selecting a value of Qr-axis current that, in conjunction with the value of d-axis current, will produce a desired rotor torque.
Claim 14
Independent Claim
69 words
A method of controlling a permanent magnet rotating machine, the machine including a stator and a rotor situated to rotate relative to the stator, the stator having a plurality of energizable phase windings situated therein, the method comprising: determining a value of dr-axis current to be injected; and selecting a value of Qr-axis current that, in conjunction with the value of d-axis current, will produce a desired rotor torque.
Claim 15
Dependent Claim
12 words
The method of claim 12 further comprising receiving the desired rotor torque.
Claim 16
Dependent Claim
23 words
The method of claim 12 further comprising providing the determined dr-axis current and the selected Qr-axis current to a pair of current controllers.
Claim 17
Dependent Claim
13 words
The method of claim 12 wherein the machine is a hybrid PM machine.
Claim 18
Independent Claim
55 words
A method of controlling a permanent magnet rotating machine, the machine including a stator and a rotor situated to rotate relative to the stator, the stator having a plurality of energizable phase windings situated therein, the method comprising: receiving energization feedback from the machine; and producing a flux estimate compensated for saturation in the stator.
Claim 19
Independent Claim
55 words
A method of controlling a permanent magnet rotating machine, the machine including a stator and a rotor situated to rotate relative to the stator, the stator having a plurality of energizable phase windings situated therein, the method comprising: receiving energization feedback from the machine; and producing a flux estimate compensated for saturation in the stator.
Claim 20
Dependent Claim
17 words
The method of claim 16 wherein producing includes producing the compensated flux estimate using nonlinear correction terms.
Claim 21
Dependent Claim
17 words
The method of claim 17 wherein the nonlinear correction terms are angle invariant terms associated with saturation.
Claim 22
Dependent Claim
15 words
The method of claim 18 wherein the angle invariant terms are quadratic or cubic terms.
Claim 23
Dependent Claim
13 words
The method of claim 16 further comprising detecting the saturation in the stator.
Claim 24
Dependent Claim
24 words
The method of claim 16 further comprising using the compensated flux estimate to estimate a rotor speed and a rotor position for the machine.
Claim 25
Dependent Claim
23 words
The method of claim 16 wherein the machine is a hybrid PM machine or a PM machine having embedded magnets in the rotor.
Claim 26
Dependent Claim
12 words
The method of claim 16 wherein the machine includes highly magnetized material.
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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) | 2011-03-11 | 2011-09-10 | 2012-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2015-03-11 | 2015-09-10 | 2016-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2019-03-11 | 2019-09-10 | 2020-03-11 | $7700.00 | Window Closed / Lapsed |