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

Ahmad, Md Zarafi and Nik Idris, Nik Rumzi and Mohamed Yatim, Abdul Halim (2007) Overmodulation and field weakening in direct torque control of induction motor drives. In: Electric Machines & Drives Conference, 2007. IEMDC '07. IEEE International, 3-5 May 2007, Antalya, Turkey.

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


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:DC-link voltage, direct torque control, electric vehicles, field weakening, induction motor drives, overmodulation mode, space vector modulation
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:Electrical Engineering
ID Code:7382
Deposited By: Norhafizah Hussin
Deposited On:02 Jan 2009 02:46
Last Modified:01 Jun 2010 15:51

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