US6762573B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
System and method for estimating rotor position of a permanent magnet motor
Assignee: GM Global Technology Operations LLC
•
Filing: 2002-02-26
•
Granted: 2004-07-13
•
Expires: 2022-02-26
Abstract
Abstract A rotor position estimator for a permanent magnet motor with a stator and a rotor includes a sensing circuit that generates d-axis and q-axis negative sequence stationary current (NSSC) signals. A signal conditioning circuit combines the d-axis and q-axis NSSC signals with first and second positive feedback signals that are based on a rotor position estimate signal. A regulator is coupled to an output of the signal conditioning circuit. A mechanical system simulator that is coupled to the regulator and a demand torque signal generates the rotor position estimate signal. The signal conditioning circuit includes a second harmonic amplifying circuit that receives the rotor position estimate signal and outputs the first feedback signal to a first multiplier. The signal conditioning circuit includes an inverse saliency model receives the rotor position estimate signal and outputs the second feedback signal to a second multiplier.
Inventors
- 👤 Nitinkumar Ratilal Patel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:37
CPC Classifications
H; H02; H02P; H02P6/00; H02P6/14; H02P6/16; H02P6/18; H02P6/183; H02P21/00; H02P21/14; H02P21/18
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
99 words
A rotor position estimator for a permanent magnet motor that includes a stator and a rotor, comprising: a sensing circuit that generates d-axis and q-axis negative sequence stationary current (NSSC) signals; a signal conditioning circuit that combines said d-axis and q-axis NSSC signals with a first positive feedback signal that is based on a rotor position estimate signal to generate modified d-axis and q-axis NSSC signals; a regulator coupled to an output of said signal conditioning circuit; and a mechanical system simulator that is coupled to an output of said regulator and that generates said rotor position estimate signal.
Claim 2
Dependent Claim
99 words
A rotor position estimator for a permanent magnet motor that includes a stator and a rotor, comprising: a sensing circuit that generates d-axis and q-axis negative sequence stationary current (NSSC) signals; a signal conditioning circuit that combines said d-axis and q-axis NSSC signals with a first positive feedback signal that is based on a rotor position estimate signal to generate modified d-axis and q-axis NSSC signals; a regulator coupled to an output of said signal conditioning circuit; and a mechanical system simulator that is coupled to an output of said regulator and that generates said rotor position estimate signal.
Claim 3
Dependent Claim
35 words
The rotor position estimator of claim 1 wherein said signal conditioning circuit combines said modified d-axis and q-axis NSSC signals with a second positive feedback signal that is based on a rotor position estimate signal.
Claim 4
Dependent Claim
17 words
The rotor position estimator of claim 2 wherein said mechanical system simulator receives a demand torque signal.
Claim 5
Dependent Claim
27 words
The rotor position estimator of claim 3 wherein said signal conditioning circuit includes a first multiplier having first inputs that receive said d-axis and q-axis NSSC signals.
Claim 6
Dependent Claim
45 words
The rotor position estimator of claim 4 wherein said signal conditioning circuit includes a second harmonic amplifying circuit having an input that receives said rotor position estimate signal and an output that produces said first feedback signal to a second input of said first multiplier.
Claim 7
Dependent Claim
46 words
The rotor position estimator of claim 5 wherein said first multiplier multiples said first feedback signal and said d-axis NSSC signal to generate said modified d-axis NSSC signal and multiples said first feedback signal and said q-axis NSSC signal to generate said modified q-axis NSSC signal.
Claim 8
Dependent Claim
41 words
The rotor position estimator of claim 6 wherein said signal conditioning circuit includes a second multiplier having first inputs that receive said modified d-axis and q-axis NSSC signals from said first multiplier and an output that is coupled to said regulator.
Claim 9
Dependent Claim
46 words
The rotor position estimator of claim 7 wherein said signal conditioning circuit includes an inverse saliency model that has an input that receives said rotor position estimate signal and that generates said second feedback signal that is output to a second input of said second multiplier.
Claim 10
Dependent Claim
29 words
The rotor position estimator of claim 1 wherein said regulator is selected from the group of proportional (P), proportional integral (PI), proportional integral differential (PID), and limited PI regulators.
Claim 11
Independent Claim
77 words
A method for estimating rotor position for a permanent magnet motor that includes a stator and a rotor, comprising the steps of: generating d-axis and q-axis negative sequence stationary current (NSSC) signals; signal processing said d-axis and q-axis NSSC signals using a first positive feedback signal that is based on a rotor position estimate signal; and using a mechanical system simulator that receives an output of said signal processing step to generate said rotor position estimate signal.
Claim 12
Independent Claim
77 words
A method for estimating rotor position for a permanent magnet motor that includes a stator and a rotor, comprising the steps of: generating d-axis and q-axis negative sequence stationary current (NSSC) signals; signal processing said d-axis and q-axis NSSC signals using a first positive feedback signal that is based on a rotor position estimate signal; and using a mechanical system simulator that receives an output of said signal processing step to generate said rotor position estimate signal.
Claim 13
Dependent Claim
29 words
The method of claim 10 further comprising the step of regulating said output of said signal processing step to produce a regulated signal before using said mechanical system simulator.
Claim 14
Dependent Claim
38 words
The method of claim 11 further comprising the step of combining said output of said signal processing step with a second positive feedback signal that is based on a rotor position estimate signal prior to said regulating step.
Claim 15
Dependent Claim
20 words
The method of claim 12 wherein said mechanical system simulator has a second input that receives a torque demand signal.
Claim 16
Dependent Claim
39 words
The method of claim 13 wherein said signal processing step includes multiplying said d-axis and q-axis NSSC signals by said first feedback signal that is output by a second harmonic amplifier to generate modified d-axis and q-axis NSSC signals.
Claim 17
Dependent Claim
21 words
The method of claim 14 wherein said a second harmonic amplifier has an input that receives said rotor position estimate signal.
Claim 18
Dependent Claim
23 words
The method of claim 15 further comprising the step of multiplying said modified d-axis and q-axis NSSC signals by said second feedback signal.
Claim 19
Dependent Claim
17 words
The method of claim 16 wherein said second feedback signal is generated by an inverse saliency model.
Claim 20
Dependent Claim
20 words
The method of claim 17 wherein said inverse saliency model has an input that receives said rotor position estimate signal.
Claim 21
Dependent Claim
106 words
A rotor position estimator for a permanent magnet motor that includes a stator and a rotor, comprising: a sensing circuit that generates d-axis and q-axis negative sequence stationary current (NSSC) signals; a signal conditioning circuit that combines said d-axis and q-axis NSSC signals with first and second positive feedback signals that are based on a rotor position estimate signal; a regulator coupled to an output of said signal conditioning circuit; and a mechanical system simulator that has a first input coupled to an output of said regulator, that has a second input that receives a demand torque signal, and that generates said rotor position estimate signal.
Claim 22
Dependent Claim
106 words
A rotor position estimator for a permanent magnet motor that includes a stator and a rotor, comprising: a sensing circuit that generates d-axis and q-axis negative sequence stationary current (NSSC) signals; a signal conditioning circuit that combines said d-axis and q-axis NSSC signals with first and second positive feedback signals that are based on a rotor position estimate signal; a regulator coupled to an output of said signal conditioning circuit; and a mechanical system simulator that has a first input coupled to an output of said regulator, that has a second input that receives a demand torque signal, and that generates said rotor position estimate signal.
Claim 23
Dependent Claim
27 words
The rotor position estimator of claim 19 wherein said signal conditioning circuit includes a first multiplier having first inputs that receive said d-axis and q-axis NSSC signals.
Claim 24
Dependent Claim
40 words
The rotor position estimator of claim 20 wherein said signal conditioning circuit includes a second harmonic amplifying circuit that receives said rotor position estimate signal and that outputs said first feedback signal to a second input of said first multiplier.
Claim 25
Dependent Claim
18 words
The rotor position estimator of claim 21 wherein said first multiplier outputs modified d-axis and q-axis NSSC signals.
Claim 26
Dependent Claim
32 words
The rotor position estimator of claim 22 wherein said signal conditioning circuit includes a second multiplier having first inputs that receive said modified d-axis and q-axis NSSC signals from said first multiplier.
Claim 27
Dependent Claim
39 words
The rotor position estimator of claim 23 wherein said signal conditioning circuit includes an inverse saliency model that receives said rotor position estimate signal and that outputs said second feedback signal to a second input of said second multiplier.
References Cited (Backward Citations)
US5140245A
Cited
US5565752A
Cited
US6081093A
Cited
US6525504B1
Cited
US6223114B1
Cited
US6462491B1
Cited
US6163127A
Cited
US6396229B1
Cited
US6339308B2
Cited
US6304052B1
Cited
JP2003259683A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2007-07-13 | 2008-01-12 | 2008-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-07-13 | 2012-01-12 | 2012-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-07-13 | 2016-01-12 | 2016-07-13 | $7700.00 | Window Closed / Lapsed |