PROJECT TITLE :

Design Optimization on Conductor Placement in the Slot of Permanent Magnet Machines to Restrict Turn–Turn Short-Circuit Fault Current

ABSTRACT:

In permanent magnet (PM) machines, a turn–flip short-circuit (SC) fault is the most vital fault to eradicate. The fault introduces high SC current within the shorted turn, that could consequently result in secondary faults unless the fault is appropriately controlled. This paper proposes feasible conductors’ placement in a very slot of a PM machine to attenuate such turn–turn fault current. In order to minimize the fault current, the conductor arrangement during a slot is optimized employing a multi-objective genetic algorithm incorporating with both analytical and finite-part numerical tool. The doable combos of conductors’ placement are set as variables and optimized for a given machine, that is designed for safety important applications. It's shown that the fault current related to one flip fault can be important for the random winding placement, even though the remedial ways are put in place. It is additionally shown that the fault current can be significantly restricted by rearranging the winding placement in a method to share slot-leakage fluxes. This is confirmed via experiment on E-core. Influences of the winding arrangement on each frequency-dependent resistances and winding’s capacitances are experimented. It's demonstrated that adopting the winding arrangement that shares the slot-leakage flux effectively edges to reduce the ac losses in addition to improved fault tolerance. But it will increase the turn–flip capacitances whose result, however, can be neglected as the resonance frequency occurs beyond the operational frequency range of the machines of interest.


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