In this paper multi-phase induction drive with a frequency converter is researched under open phase fault condition. Control strategy of stator voltage phase shift is proposed for dealing with over-currents during steady state. Symmetry of stator current trajectory is achieved. Experiments with six-phase induction motor without a neutral wire under one open phase condition were carried out. Index Terms-Current trajectory, induction motor, frequency inverter, multi-phase drive, open phase fault, scalar control.
I. INTRODUCTIONULTI-PHASE induction motors have numerous advantages compared to three-phase induction motors such as reduced torque pulsations, magnetic flux harmonic reduction, reduction on the rotor harmonic current losses, dc link current harmonics and higher reliability under the loss of one or more stator phases [1][2][3][4].Multi-phase induction motors are used in wind power systems, electrical and hybrid vehicles [5], electric ship propulsion [6], in 'more electric aircraft' actuators and in safety-critical applications, such as aerospace or military naval drives, where fault tolerance is a desirable feature [7].
In this study the direct torque control of the induction drive with a fuzzy controller was investigated. The objective of this research was the reduction of the stator current and electromagnetic torque pulsations. The principles of the fuzzy controller development for the induction drive with a direct torque control and the obtained computer model were presented, and the simulation results were compared to the results of the induction drive under the traditional direct torque control. The implementation of the applied fuzzy controller allowed us to achieve the pulsations of the torque twice lower, the stator current, flux and the maximum overshoots were lowered.
Straipsnyje apžvelgti pagrindiniai kintamosios srovės variklių parametrų identifikavimo principai. Apžvelgti dažniausiai naudojami kintamosios srovės variklių identifikavimo metodai, jų privalumai ir trūkumai. ateiktas šešiafazio asinchroninio variklio matematinis modelis. Išnagrinėti pagrindiniai tikslo funkcijos sudarymo etapai, naudojant variklio paleidimo pereinamųjų vyksmų duomenis: srovės, greičio ir sukimo momento matavimus, esant skirtingoms maitinimo įtampos dažnio vertėms.
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