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US 6,388,420 B1Granted
System and method for sensorless rotor tracking of induction machines
AssigneeGeneral Electric Company
InventorsPatrick Lee Jansen, William James Premerlani, Luis Jose Garces Rivera
Life of this patent
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Abstract
A drive system comprises a rotor position and velocity tracker adapted to decouple fundamental frequency effects of a zero sequence signal of an induction machine from the zero sequence signal and to use a resulting error signal to estimate a position and a velocity of a rotor of the induction machine.
Claims35
A drive system comprising:
- a rotor position and velocity tracker adapted to decouple fundamental frequency effects of a zero sequence signal of an induction machine from the zero sequence signal and to use a resulting error signal to estimated a position and a velocity of a rotor of the induction machine.
A drive system comprising:
- machine drive controls for using a command signal and a high-frequency ac injected signal to provide ac drive power to an induction machine;
- and
- a rotor position and velocity tracker comprising
- a subtractor for subtracting a fundamental excitation component of a zero sequence signal from the zero sequence signal to provide a rotor position indicator component, and
- a multiplier for heterodyning the rotor position indicator component and providing an error signal;
- a controller for using the error signal to provide an estimate of the rotor velocity to drive the error signal to zero, and
- an integrator for using the estimated rotor velocity to estimate the rotor position.
4 more elements
A method for driving an induction machine comprising:
- using a command signal and a high-frequency ac injected signal to provide ac drive power to the induction machine;
- decoupling fundamental frequency effects of a zero sequence signal of the induction machine from the zero sequence signal to provide an error signal;
- and
- using the error signal to estimate a position and a velocity of a rotor of the induction machine.
1 more element
A method for induction machine rotor tracking comprising:
- decoupling fundamental frequency effects of a zero sequence signal of the induction machine from the zero sequence signal to provide an error signal;
- and
- using the error signal to estimate a position and a velocity of the induction machine rotor.
Dependencies are inferred from the claim text.