Soft controller switching technique to minimize the torque and current pulsations of a SCIM during its reswitching.

Abdul Sattar Larik; Muhammad Rafiq Abro; Abdul Rashid Shaikh

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Soft controller switching technique to minimize the torque and current pulsations of a SCIM during its reswitching.

Author(s)

Abdul Sattar Larik Department of Electrical Engineering, Mehran University of Engineering and Technology, Jamshoro, Sindh, Pakistan

Muhammad Rafiq Abro Department of Electrical Engineering, Mehran University of Engineering and Technology, Jamshoro, Sindh, Pakistan

Abdul Rashid Shaikh Pakistan Navel Engineering College, National University of Science & Technology, Karachi, Pakistan

Abstract

The direct-on –line starting of induction motor draws heavy current and to limit this inrush current to a safe level normally a star-delta switch is used. However, the switching over from star to delta causes over current transients and this leads to torque pulsations. Therefore, in this paper the current and torque pulsations developed during the switching process are focused and a soft-switched controller is devised to minimize the re-closure transient currents and torque pulsations during star-delta switching of induction motor. The designed system can readily handles the sensing of favorable conditions of re-closure of a switched off running induction motor and it minimizes the inrush current and hence the pulsations of torque of all types of induction motors, whether, single phase or three phase. An investigation is made into the transient currents and pulsation torques generated due to opening the circuit of a running induction motor and the switching pattern of star-delta switching. The reswitching control scheme for the induction motor is practically tested in the laboratory with and without soft controller.

Publication Details

Page(s) 205-210

DOI DOI not available

Published Journal: Mehran University Research Journal of Engineering and Technology, Volume: 29, Issue: 2, Year: 2010

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