Braking methods of induction motor using direct torque control

May 14th, 2015
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An ac dynamic braking is obtained when the motor is run on a single phase supply by disconnecting one phase from the source and either leaving it open or connecting it with another phase.

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05372389THE ELEVENTH INTERNATIONAL MIDDLE EASTPOWER SYSTEMS CONFERENCE(MEPCON'2oo6)Braking methods of induction motor using direct torque control G. M. A. Sowilam, M.I.KorflyHelwan University, Faculty of Engineering,Helwan, Cairo, Egypt. sowilam@yahoo.comAbstract- This paper studies the performance of the threephase induction motor with different methodsof braking,such as forward plugging, ac dynamic braking andreverse plugging braking using direct torque control(DTC). The simulation results are validated with thepractical results under different conditions. The paperpresents a solutionto decrease the energy losses resultingfrom traditional methods of braking (in the form of heatenergy and friction). The induction motor is tested tooperatewith constant load torque and tractionload torquein di fferent operatlng modes such as: The nonnaloperation, the operation in the second quadrant, theoperation in the third quadrant and the operation in thefourth quadrant.I.INTRODUCTIONAn ac dynamic braking is obtained when the motoris run on a single phase supply by disconnecting onephase from the source and either leaving it open orconnecting it with another phase. Whenconnected tosingle-phase supply, the motor can be considered tobe fed by positiveand negative sequencethree-phaseset of voltages. Net torque produced by the machineis the sum of torques due to positive and negativesequence voltages. When the rotor has a highresistance, the net torq

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