Patent ID: 9407188
Filing Date: 2016-08-02
CPC Classification: H02P

Claim Text:
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.