Transient characteristics of a new simplified speed sensorless vector control for induction motors

Abstract

-This paper presents a new simplified sensorless speed control method of induction motors (IM). The output voltage of d-axis PI current controller is used to compute the flux angle and to control the speed in correspondence with its reference. The effectiveness of the proposed method has been demonstrated by root loci and experiments. Especially the proposed method can stabilize the system at low speed regenerating operations.

Stability Comparison of New Simplified Speed Sensorless Vector Control Systems for Induction Motors

“…By neglecting the derivative of d-axis current and flux, the following d-axis voltage model equation is obtained in rotating reference frame [7].…”

“…In the previous paper, we analyzed the system A [7]. Therefore, we analyze the system B in this paper.…”

“…-10 0 . The increasing value of speed control proportional gain pc K can improve the stability region at low speed of motoring and plugging operations [7]. Fig.…”

“…On the other hand, we have proposed a simplified sensorless vector control method of IM in the previous research [7] (we call system A). In this paper, we study the system B in which the q-axis PI current controller is contained and we discuss the stability of systems A and B.…”