SENSORLESS VECTOR CONTROL APPARATUS FOR INDUCTION MOTOR

摘要

A sensor-less vector control apparatus for induction motor enhanced in performance of sensor-less vector control by estimating changes in parameters in real time is provided, the apparatus including a current controller, a first phase converting unit, a second phase converting unit, a rotor speed and position estimator configured to measure a rotor speed of a rotor and a rotor flux using an output value of the first phase converting unit and to estimate a rotor position using the output value, and a stator resistance and angle error estimator configured to calculate a stator resistance and an angle error of the induction motor by receiving d, q axis current commands on the synchronous reference frame inputted from the current controller and d, q voltages on the synchronous reference frame outputted from the current controller, and to provide the stator resistance to the rotor speed and position estimator.

主权项

1. A sensor-less vector control apparatus for induction motor, the apparatus comprising:
a current controller configured to output d and q-axis voltages in a synchronous reference frame, using d and q-axis current references in the synchronous reference frame; a first phase converting unit configured to convert output voltages from the current controller into voltages in a stationary reference frame; an inverter configured to apply voltages to an induction motor by receiving the output of the first phase converting unit; a second phase converting unit configured to convert phase currents measured based on the voltages applied to the induction motor from the inverter into d and q-axis currents in the synchronous reference frame; a rotor speed and position estimator configured to measure a rotor speed and a rotor magnetic flux of the induction motor and estimate a rotor position by using the phase currents and an output value of the first phase converting unit and to estimate a rotor position using the output value; and a stator resistance and angle error estimator configured to calculate a stator resistance and an angle error of the induction motor by receiving d, q axis current commands on the synchronous reference frame inputted from the current controller and d, q voltages on the synchronous reference frame outputted from the current controller, and to provide the stator resistance to the rotor speed and position estimator.