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Overmodulation and field weakening in direct torque control of induction motor drives

Ahmad, Md. Zarafi and Nik Idris, N. R. and Yatim, Abdul Halim Mohamad (2007) Overmodulation and field weakening in direct torque control of induction motor drives. In: Proceedings of IEEE International Electric Machines and Drives Conference, IEMDC 2007 .

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Official URL: http://dx.doi.org/10.1109/IEMDC.2007.382700

Abstract

During transient states, for instance during acceleration and deceleration, the inverter used in an induction motor drive normally operates in overmodulation in order to efficiently utilize the DC-link voltage. Beyond the based-speed, the flux is normally reduced proportionally with speed to extend the speed range of the drive system. The capability of the induction motor drive under overmodulation and field weakening modes are important, especially in electric vehicle applications, where the available power is limited and the speed range needs to be increased to avoid the use of the mechanical gears. This paper presents the performance of the direct torque control (DTC) of an induction motor drive under the overmodulation and field weakening conditions for constant frequency torque controller-based DTC drive. The results obtained showed that the drive system is capable of operating in overmodulation and field weakening regions without resolving to the common approach of space vector modulation (SVM) based approach

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:AC Drives, direct torque control, constant torque controller, overmodulation, field weakening
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:Electrical Engineering
ID Code:7317
Deposited By: Nur Amal Zakiah Shamsudin
Deposited On:02 Jan 2009 07:17
Last Modified:01 Jun 2010 15:50

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