Title :
A novel torque hysteresis comparator for torque and current ripple reduction of direct torque control of induction machine
Author :
Keyhani, Hamid Reza ; Zolghadri, Mohammad Reza ; Haghbin, Saeed
Author_Institution :
Sch. of Electr. Eng., Sharif Univ. of Technol., Tehran, Iran
Abstract :
The notable effects of time delay and time discretization on the torque and current ripple amplitude of the direct torque controlled induction motor scheme are investigated. A simply modified torque hysteresis comparator structure is proposed. It minimizes the undesirable effects of the time delay and time discretization on the torque ripple and allows a sensible reduction of torque and current ripple amplitudes and switching frequency in the whole rotor speed range. Numerical simulations and experimental tests have been carried out to validate the proposed torque comparator effect.
Keywords :
comparators (circuits); induction motors; numerical analysis; rotors; torque control; current ripple reduction; direct torque control; induction motor; numerical simulation; rotor speed range; switching frequency; time delay; time discretization; torque hysteresis comparator; Delay effects; Hysteresis; Induction machines; Induction motors; Pulse width modulation; Pulse width modulation inverters; Rotors; Stators; Torque control; Voltage;
Conference_Titel :
Power Electronics Congress, 2004. CIEP 2004. 9th IEEE International
Print_ISBN :
0-7803-8790-2
DOI :
10.1109/CIEP.2004.1437566