Analytical Prediction of Short-Circuit Current in Fault-Tolerant Permanent Magnet Machines
Sun, Z. Wang, J. Howe, D. Jewell, G.
Z. Sun is with the Department of Electrical and Electronic Engineering, Electrical Machines and Drives Research Group, University of Sheffield, S1 3JD Sheffield, U.K.;
This paper appears in: Industrial Electronics, IEEE Transactions on Accepted for future publication
First Published:
2008-08-19
ISSN: 0278-0046
Digital Object Identifier: 10.1109/TIE.2008.2003210
Abstract
This paper describes an analytical technique that can be utilized to predict the short-circuit current in a fault-tolerant permanent magnet machine under partial turn short-circuit fault conditions. It has been shown that the current in partially short-circuited turns is dependent on their relative position in the slot where the phase winding is accommodated and the slot-leakage flux associated with these turns has a significant influence on the short-circuit current when a remedial action is applied. An analytical model which quantifies the variation of slot- leakage flux as a function of the relative position of partially short-circuited turns has been developed. Both finite element analysis and experiment results demonstrates effectiveness of the proposed technique for predicting the short-circuit current.
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