The Slip Frequency Type Vector Control Equivalent to The Flux Feedback Type Vector Control using the Flux Observer

Abstract

The slip frequency type vector control and the flux feedback type vector control are typical control methods of induction motors. We show that two methods are some except for a frame of reference. The flux feedback type vector control using the rectangular coordinate uses vertical and horizontal components of the rotor flux. The slip frequency type vector control using the polar coordinate users absolute value and angle of the rotor flux. Usually, the flux feedback vector control dose not use the rotor flux model but uses the rotor flux observer for flux estimation. On the other hand, the slip frequency type control uses the rotor flux model. Therefore, we propose the slip frequency type vector control using the rotor flux observer. The proposed method is equivalent to the flux feedback type vector control using the rotor flux observer. Then it is more robust than the conventional slip frequency type vector control.