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Minimisation of flux droop in direct torque controlled induction motor drives

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2 Author(s)
Wong, W.S.H. ; Swinburne Sarawak Univ. of Technol., Malaysia ; Holliday, D.

As a result of the uneven voltage vector contribution to the control of stator flux and torque in a direct torque controlled (DTC) induction machine, stator flux magnitude droops at every switching sector transition, particularly when the machine is running at low speed with a heavy load. A simple strategy rotates the conventional DTC switching sectors according to the states of the flux and torque hysteresis comparators and a gating signal. The applied voltage vector thereby maintains stator flux magnitude at the transition between switching sectors and hence improves the phase current without deteriorating the torque response. A thorough simulation analysis of stator flux droop is presented, and both simulation and experimental results confirm the effectiveness of the proposed strategy.

Published in:

Electric Power Applications, IEE Proceedings -  (Volume:151 ,  Issue: 6 )