LOW SPEED SENSORLESS VARIABLE STRUCTURE CONTROL OF INDUCTION MOTOR

Abstract Torque and speed sensorless induction motor control is presented in this paper. The idea is realized using a sliding mode closed loop rotor flux observer for estimation of electromotive force of machine. This signal is then used in nonlinear stator flux and torque control of induction motor and in rotor flux observer for speed and flux estimation. The analysis of the proposed method is included. Proposed control scheme was implemented on DSP system extended with FPGA where PWM procedure with dead time compensation was realized. Experimental results demonstrated high efficiency of the proposed estimation and control method.

[1]  R. Lorenz,et al.  Using multiple saliencies for the estimation of flux, position, and velocity in AC machines , 1997, IAS '97. Conference Record of the 1997 IEEE Industry Applications Conference Thirty-Second IAS Annual Meeting.

[2]  Joachim Holtz.  Sensorless position control of induction motors-an emerging technology , 1998, IEEE Trans. Ind. Electron..

[3]  Vadim I. Utkin,et al.  Sliding mode control design principles and applications to electric drives , 1993, IEEE Trans. Ind. Electron..

[4]  Joachim Holtz,et al.  Methods for Speed Sensorless Control of AC Drives , 1996 .

[5]  Marian P. Kazmierkowski,et al.  Direct torque control of PWM inverter-fed AC motors - a survey , 2004, IEEE Transactions on Industrial Electronics.

[6]  Peter Vas,et al.  Sensorless vector and direct torque control , 1998 .

[7]  Vadim I. Utkin,et al.  Sliding mode control in discrete-time and difference systems , 1994 .

[8]  Vadim I. Utkin,et al.  Sliding Modes in Control and Optimization , 1992, Communications and Control Engineering Series.

[9]  Joachim Holtz.  Sensorless position control of induction motors-an emerging technology , 1998, IECON '98. Proceedings of the 24th Annual Conference of the IEEE Industrial Electronics Society (Cat. No.98CH36200).

[10]  Thomas A. Lipo,et al.  A direct field oriented controller for induction motor drives using tapped stator windings , 1988, PESC '88 Record., 19th Annual IEEE Power Electronics Specialists Conference.