Abstract
A field-oriented control induction motor, without speed sensors, using the extended Kalman filter is proposed. With this method, the state is composed of stator current, rotor flux, motor speed, load torque and rotor time constant. The extended Kalman filter was used to estimate the motor speed, rotor flux, rotor time constant and load torque simultaneously by measuring the stator currents and voltages. The motor speed estimation was estimated using the extended Kalman filter and feedback to produce the speed control without speed sensors. The rotor time constant estimation was used to regulate the field-oriented mechanism to achieve the field orientation. The load torque estimation provided a torque feed-forward loop to realize a robust speed control against the load torque disturbance. Some experimental results demonstrate the proposed scheme’s effectiveness.
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