Title :
Direct torque control of induction motor-variable switching sectors
Author :
Mei, C.G. ; Panda, S.K. ; Xu, J.X. ; Lim, K.W.
Author_Institution :
Dept. of Electr. Eng., Nat. Univ. of Singapore, Singapore
Abstract :
An induction motor drive based on direct torque control (DTC) allows high dynamic performance to be obtained with a very simple hysteresis control scheme. In this paper, the problem of stator flux drooping at low speeds has been investigated. By rotating the original flux sectors defined for conventional DTC near the sector boundaries, it is possible to maintain stator flux within the prescribed hysteresis bands and therefore improve the stator flux in the machine as well as the harmonic contents of stator currents. Moreover, the use of the proposed scheme also results in a reduction of overall inverter switching frequency. The effectiveness of the proposed scheme is evaluated through simulation studies, and is also supported with experimental results obtained from a 1.5 kW induction motor driven in a laboratory environment
Keywords :
DC-AC power convertors; control system analysis; control system synthesis; electric current control; induction motor drives; invertors; machine control; machine testing; stators; switching; torque control; 1.5 kW; control design; control performance; control simulation; direct torque control; dynamic performance; harmonic contents; hysteresis bands; hysteresis control scheme; induction motor drive; inverter switching frequency; low-speed stator flux drooping; original flux sectors rotation; stator flux; variable switching sectors; Character generation; Hysteresis motors; Induction motor drives; Induction motors; Inverters; Laboratories; Stators; Switching frequency; Torque control; Voltage control;
Conference_Titel :
Power Electronics and Drive Systems, 1999. PEDS '99. Proceedings of the IEEE 1999 International Conference on
Print_ISBN :
0-7803-5769-8
DOI :
10.1109/PEDS.1999.794540
