Implementation of a speed sensorless vector controlled induction motor drive with zero speed start-up

In this thesis the implementation of a speed sensorless vector controlled induction motor drive with start-up from zero speed is studied. Both indirect vector control and direct vector control methods are used in the drive operation and are reviewed in chapter 2. A new control strategy using a hybrid vector control method is described. This new method allows the drive to start from zero speed without a speed sensor using indirect vector control and then transition to direct vector control. The hybrid vector control method and the outstanding features of this method are described in chapter 3. The drive was implemented in hardware using a 5 horsepower (HP) insulated gate bipolar transistor (IGBT) inverter, 5HP induction motor, and a Texas Instruments TMS320C30 digital signal processor (DSP). The hardware detail and DSP software implementation are described in chapter 4. The results from the experimental study are presented in chapter 5.