Slip Frequency Control Type Vector Control of an Induction Motor Using Numerical Data Processor

Abstract

As a method of variable-speed induction motor drives, there is newly developed vector control method. The vector control method is made by controlling flux current component and torque current component of stator current vector, respectively. Since the flux component is parallel with rotor flux vector and the torque component is perpendicular with the flux vector, the control method is characterized by decoupling between the components of flux and torque.In the vector control method, there are field-orientation method (rotor flux vector detection type-vector control method) and slip frequency control type vector control. A flux detector is required in the field-orientation method, and therefore, the slip frequency control type vector control has been made by a 16-bit personal computer using numerical data processor. Then, the vector controlled induction motor shows good dynamic performance. This paper describes the theory and experimental results.