Faulty Operations of a PM Fractional-Slot Machine With a Dual Three-Phase Winding

Analysis of Vertical Strip Wound Fault-Tolerant Permanent Magnet Synchronous Machines

“…A typical fault-tolerant Permanent Magnet Synchronous Machine (FT-PMSM) drive topology includes a number of design features [5][6][7][8][9][10][11][12][13] to enable a level of operation when faults [3,[13][14][15][16][17] ensue. Although such a machine drive topology, if appropriately designed, can potentially tolerate converter failures, winding open circuit failures and terminal SC failures, a winding inter-turn (a single turn) SC fault remains problematic [6].…”

“…A dual three-phase winding arrangement [8,32] is adopted in the FT-PMSM in order to achieve redundancy with the required level of reliability. This dual three-phase FT-PMSM model is developed in Simulink and integrated within the drive system model.…”

Open-Phase Fault Operation on Multiphase Induction Motor Drives

“…Stator faults: open-circuit or short-circuit of one or more stator phase windings. These kinds of faults appear due to mechanically damaged connections caused by insulation failure, extreme electrical operating conditions (high temperatures in the stator core or winding coils, starting stresses, over-or under-voltage operation, electrical discharges, unbalanced stator voltages) or nonappropriate ambient conditions (dirt, oil and moisture contamination) [10][11][12], leading to inter-turn [12], stator-winding [13], and different phase winding short circuits [10][11], which may result in further open-phase faults of one or more phase windings [14][15]. 3.…”

“…Induction Motors -Applications, Control and Fault DiagnosticsConsequently, the machine coupling inductance matrices (10)(11)(12)(13)(14) for the stator-rotor components need to be arranged considering the absence of the faulty phase.…”

“…For instance, in the case of short-circuit faults, the proposed fault management strategies are based on controlling the available four healthy phases in a five-phase drive, maintaining operation at the expense of higher stator phase winding losses and torque ripple [27]. Nonetheless, this increase in torque ripple is managed in a dual three-phase drive [13] maintaining postfault operation with one three-phase drive in short-circuit and compensating the braking torque with the healthy three-phase drive [28]. The inclusion of auxiliary semiconductors in the electrical machine windings, in order to change from a short-circuit fault to an open-circuit or open-phase fault, was also addressed in [29], where ripple-free output torque was obtained with the appropriate control of the remaining four healthy phases.…”