Sensorless speed operation of cage induction motor using zero drift feedback integration with MRAS observer

The paper investigates the improvement in sensorless vector control of induction machines through the use of a non-linear feedback integrator embedded in a standard rotor flux model reference adaptive system (MRAS)-based observer. The feedback integrator compensates for drift and dc-offset and is capable of open loop flux estimation down to frequencies below 0.1 Hz. The paper presents experimental results of sensorless speed controlled induction motor exploiting a MRAS observer. The sensorless system shows good performance down to frequencies of 0.2 Hz

[1]  H. Kubota,et al.  DSP-based speed adaptive flux observer of induction motor , 1991, Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting.

[2]  T. Ohtani,et al.  Vector control of induction motor without shaft encoder , 1989, Conference Record of the IEEE Industry Applications Society Annual Meeting,.

[3]  Bin Wu,et al.  New integration algorithms for estimating motor flux over a wide speed range , 1997 .

[4]  Jan Melkebeek,et al.  Speed sensorless direct torque control of induction motors using an adaptive flux observer , 1999, Conference Record of the 1999 IEEE Industry Applications Conference. Thirty-Forth IAS Annual Meeting (Cat. No.99CH36370).

[5]  J. Holtz,et al.  Sensorless vector control of induction motors at very low speed using a nonlinear inverter model and parameter identification , 2001, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248).

[6]  C. Schauder,et al.  Adaptive speed identification for vector control of induction motors without rotational transducers , 1989, Conference Record of the IEEE Industry Applications Society Annual Meeting,.