Abstract
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.
Highlights
A compensation method for stator open-phase fault is presented. It allows control of stator current amplitudes by adjustment of stator voltage phase angles without reducing voltage amplitudes
Experiments show that slight adjustments to voltage phase angles has great impact on the trajectory in an induction motor with isolated neutral point
Mathematical models are not accurate enough to calculate optimal stator voltage phase angles with required accuracy
Summary
MULTI-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]. Induction motor failures can be divided into the following categories: bearing faults, stator and rotor faults, eccentricity and vibration faults. The most common failures occur in the stator and rotor. Stator faults are open circuit or short-circuit of one or more stator windings, coil-to-coil, phase to phase and coil to ground. Open phase fault is the most common fault that increases peak values of currents in the rest of the phases significantly. Under these conditions trajectory of rotating magnetic field becomes elliptical. It is important to find appropriate methods to obtain circular currents trajectories in six-phase motors for single-phase fault. A control strategy of stator voltage phase shift is proposed for dealing with over-currents during steady state
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