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Robust chattering free sliding mode control of servo drives

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1 Author(s)
Jezernik, K. ; Fac. of Tech. Sci., Maribor Univ., Slovenia

A new discrete-time control algorithm has been developed by combining variable structure systems (VSS) and Lyapunov design. It possesses all the good properties of the sliding mode control and avoids the unnecessary discontinuity of the control input, thus eliminating chattering which has been considered as a serious obstacle for applications of VSS. A unified control approach for the stator currents and torque control based on the discrete-time sliding mode for application in indirect vector control of an IM drive is developed. The sliding mode approach can be applied to the control of an IM servodrive due to the replacement of the hysteresis controller with the widely used PWM technique. All the theoretical issues are verified by experiments. The experimental system consists of a transputer T805 and a microcontroller, which enables parallel processing

Published in:

Power Electronics and Drive Systems, 1995., Proceedings of 1995 International Conference on

Date of Conference:

21-24 Feb 1995