Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1998-11-16
2000-05-30
Martin, David S.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318801, 318811, 318813, H02P 534
Patent
active
06069467&
ABSTRACT:
A drive system for providing ac drive power to an induction machine with asymmetrical rotor resistance and for sensorless rotor tracking of the induction machine includes: a signal injector for determining a stator command signal in a reference frame which is aligned with either an estimated rotor reference frame; a signal determiner for determining a feedback stator signal of the induction machine in a stator reference frame; and a rotor position and velocity tracker for using the feedback stator signal to estimate a rotor velocity and position by transforming the feedback stator signal into an orthogonal axis feedback stator signal in the estimated rotor reference frame, isolating a component of the orthogonal axis feedback stator signal which is in-phase with the injected stator command signals, filtering the isolated component to isolate an error term, and generating a position estimate by driving the isolated error term towards zero. In several related embodiments a flux axis stator command signal is injected into the drive system and flux axis and torque axis stator feedback signals are then used for rotor position and velocity tracking.
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Agosti Ann M.
Breedlove Jill M.
General Electric Company
Martin David S.
LandOfFree
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