Dual field orientation for vector controlled cage induction motors

The presented vector control structure combines the advantages of two types of field-oriented procedure. It is proposed for the short-circuited induction motor supplied from a voltage-source inverter (VSI) with voltage-feedforward (carrier-wave or space-vector) PWM. The speed and flux controllers generate directly the rotor-field-oriented components of the stator-current. The computation of the stator-voltage control variables of the inverter is made in the simplest manner in the stator-field oriented coordinate frame. As a consequence the control structure became motor parameter independent. There are presented simulation results and implementation possibilities.