Method for controlling torque in a rotational sensorless induction motor control system with speed and rotor flux estimation
AssigneeFord Global Technologies, LLC
InventorsAlexei Pavlov, Alexander T. Zaremba
Life of this patent
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Abstract
A multi-phase induction motor torque control method comprising the steps of establishing an adaptive speed observer and an adaptive flux observer using a speed sensorless control scheme. Rotor speed is estimated based on filtered current and voltage command signals as inputs. A flux observer based on the estimated rotor speed and rotor flux angle is calculated using the estimated rotor flux. Torque is determined following estimation of speed and flux.
Claims8
A torque control method for a multiple-phase induction motor, the motor having a rotor and a stator with windings establishing a rotating flux field, the method comprising the steps of:
- measuring stator current;
- filtering stator current;
- calculating stator voltage;
- filtering stator voltage;
- estimating stator current as a function of rotor speed;
- calculating stator current error;
- estimating rotor speed and adjusting it to converge with actual rotor speed;
- defining a rotor flux observer;
- calculating a rotor flux vector;
- and
- calculating rotor torque using flux orientation and transformed stator current and voltage values.
A control system for controlling torque of a multiple-phase induction motor in a hybrid automotive vehicle powertrain that includes an internal combustion engine, the system comprising a controller for determining induction motor torque, the controller including logic for:
- measuring stator current;
- filtering stator current;
- calculating stator voltage;
- filtering stator voltage;
- estimating stator current as a function of rotor speed;
- calculating stator current error;
- estimating rotor speed and adjusting it to converge with actual rotor speed;
- defining a rotor flux observer;
- calculating a rotor flux vector;
- and
- calculating rotor torque using flux orientation and transformed stator current and voltage values.
Dependencies are inferred from the claim text.