Study on Speed Sensorless Direct Torque Control of Five-Phase Induction Motor

The space voltage vector selection and optimization have more flexibility and complexity for the additional voltage vectors in five-phase induction motor direct torque control system.In order to control motor speed efficaciously,a whole direct torque control scheme was presented based on the analysis of space voltage vector on five-phase induction motor.In this system,stator resistance was identified online to improve stator flux estimation precision.Then,a speed estimation method was presented based on stator current vector orientation,which had the characteristics of high precision and easy to implement.A simulation experiment was carried out,it indicated that control scheme is right and practical. 8figs.,2tabs.,10refs.