A Sensorless Speed Control using Stator Ripple Currents for an Induction Motor Drive with Space Phasor PWM

Mohapatra, KK and Gopakumar, K and Baiju, MR and Murty, BV (2004) A Sensorless Speed Control using Stator Ripple Currents for an Induction Motor Drive with Space Phasor PWM. In: Second International Conference on Power Electronics, Machines and Drives, 2004. (PEMD 2004), 31 March-2 April, Edinburgh, UK, Vol. 1 81-86.

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Abstract

In the present paper a simple sensorless speed estimation scheme is presented, where the speed information is obtained from the motor phase current ripple. The scheme measures the stator current phasor deviation direction to determine the back EMF vector position during inverter zero vector switching states. This measurement of rotor flux position is done indirectly by computing the motor back EMF position which is orthogonal to the rotor flux position. The space vector PWM voltage output in motor phase generates a current ripple pattern, which depends upon the ripple voltage and equivalent stator leakage inductance. For high speed operation when the time duration for the zero vector switching states are small an indirect method for flux position estimation is proposed, where the effect of active voltage vectors on the stator ripple current is eliminated by creating a virtual short circuit at the motor terminals.

Item Type:	Conference Paper
Publisher:	IEE
Additional Information:	Copyright for this article belongs to Institution of Electrical Engineers (IEE)
Keywords:	Field oriented control;Induction machine;Current ripple
Department/Centre:	Division of Electrical Sciences > Electronic Systems Engineering (Formerly Centre for Electronic Design & Technology)
Date Deposited:	10 Oct 2005
Last Modified:	19 Sep 2010 04:20
URI:	http://eprints.iisc.ac.in/id/eprint/3784

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