Sensorless control system for induction motor employing direct torque and flux regulation
AssigneeFord Global Technologies, LLC
InventorsAlexey Pavlov, Alexander T Zaremba
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Abstract
A sensorless control system for an induction motor employs direct tracking of torque and flux regulation to achieve improved motor control without the need for transformation to the rotor flux related frame. A novel torqueflux dynamic model used to implement the control method employs stator voltage as an input, and achieves separation of torque and flux regulation. An alternate regulation method better suited for slow reference signals relies on a steady state solution of the dynamic model.
Claims10
A method of controlling torque of a multi-phase induction motor based on direct tracking of the motor's torque and flux, comprising:
- (a) estimating rotor speed of said motor;
- (b) estimating rotor flux from said estimated rotor speed and stator current;
- (c) estimating rotor torque from said estimated rotor flux;
- and
- (d) using the estimated rotor torque and estimated rotor flux to control said motor.
Dependencies are inferred from the claim text.