Short-circuit faults in high-speed PM machines with parallel strands and coils

Conference paper (2014)

Authors

M. van der Geest Electrical Power Processing
H. Polinder Electrical Power Processing
Jan Abraham Ferreira Electrical Power Processing
Research Group
Electrical Power Processing
Permanent-magnet machine Fault-tolerant Shortcircuit
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Published Date

2014

Language

English

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Research Group

Electrical Power Processing

Abstract

Electrical machines for safety critical applications need to be able to withstand all possible short-circuits, including those between individual turns. In high-speed machines multiple parallel strands may be used to reduce AC losses in the winding, increasing the likelihood of a turn-level short-circuit. This paper considers the consequences of using parallel strands on the short-circuit losses. Additionally, the effect of using a PWM voltage supply is also considered. It is found that using multiple parallel strands reduces the local losses that occur during a short-circuit, but at the same time slightly increases the total losses. Also, local fault currents can be reduced better with a remedial terminal short-circuit when using parallel strands, suggesting a small safety benefit. The effect of supply voltage harmonics on the maximum short-circuit losses is found to be negligible.