Fault-tolerant operation of delta-connected scalar- and vector-controlled AC motor drives

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IEEE Transactions on Power Electronics, ISSN: 0885-8993, Vol: 27, Issue: 6, Page: 3041-3049

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Ahmed, Ahmed Mohamed Sayed; Demerdash, Nabeel
Institute of Electrical and Electronics Engineers (IEEE); e-Publications@Marquette
Engineering; stator windings; circuit faults; fault tolerance; fault tolerant systems; torque; windings; voltz-per-hertz (scalar) control method; AC motor drives; closed loop vector controlled drives; delta-connected stator windings; induction motor; open delta; stator failure; stator fault mitigation; stator unbalance; torque pulsations; Computer Engineering; Electrical and Computer Engineering
article description
Operation and analysis of delta-connected ac motor-drive systems under fault-tolerant open-phase mode of operation is introduced in this paper for both scalar- and vector-controlled motor-drive systems. This technique enables the operation of the three-phase motor upon a failure in one of its phases without the need of a special fault-detection algorithm. It is mainly used to significantly mitigate torque pulsations, which are caused by an open-delta configuration in the stator windings. The performance of the fault-tolerant system was verified using a detailed time stepping finite element simulation as well experimental tests for a 5-hp 460-V induction motor-drive system and the results are presented in this paper This paper also compares the operation of this fault-tolerant mode of operation for the cases of scalar-controlled and closed-loop vector-controlled motor-drive systems. © 2006 IEEE.