System and method for estimating rotor position of a permanent magnet motor
First Claim
1. 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.
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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.
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Citations
24 Claims
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1. A rotor position estimator for a permanent magnet motor that includes a stator and a rotor, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for estimating rotor position for a permanent magnet motor that includes a stator and a rotor, comprising the steps of:
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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. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A rotor position estimator for a permanent magnet motor that includes a stator and a rotor, comprising:
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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. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification