Control of Open-Loop PWM Delta-Connected Motor-Drive Systems under One Phase Failure Condition

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Journal of Power Electronics

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Ahmed, Ahmed Mohamed Sayed; Demerdash, Nabeel
Korean Institute of Power Electronics; e-Publications@Marquette
Delta-connected motors; Fault mitigation; Fault-tolerant motor-drive systems; Robust control; Open-loop control; Computer Engineering; Electrical and Computer Engineering; Engineering
article description
A new fault-tolerant control topology for open-loop motor-drive systems with Delta-connected stator windings is introduced in this paper. This new control topology enables the operation of a three-phase induction machine as a two-phase machine fed by a three-phase inverter upon a failure in one of the motor phases. This topology utilizes the “open-Delta” configuration to independently control the current in each of the two remaining healthy phases. This new control technique leads to the alleviation of any torque pulsations resulting from the consequences of the asymmetrical conditions associated with this class of faults.