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A Rectangular End-Winding Model for Enhanced Circulating Current Prediction in AC Machines

Maurer, Frederic; Nøland, Jonas Kristiansen
Peer reviewed, Journal article
Accepted version
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URI
https://hdl.handle.net/11250/2677563
Date
2020
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  • Institutt for elkraftteknikk [2646]
  • Publikasjoner fra CRIStin - NTNU [41867]
Original version
IEEE transactions on energy conversion. 2020, PP (99), .   10.1109/TEC.2020.3009345
Abstract
The end-winding region is usually overlooked in the roebel design of large AC machines. However, saturated stator slots cause overhang parts to impact the circulating currents significantly. In fact, a precise knowledge of the winding overhang strand inductances is crucial when optimising the transpositions of large roebel bars, especially in the case of under-roebeling (having less than 360-transposition in the active part) where the goal is to compensate the winding overhang parasitic field with the slot-parasitic field. In this paper, a rectangular inductance calculation model (R-ICM) is proposed. It results in a circuital lumped-element model (LEM) that takes the strand dimensions, the bar bending, as well as small-scale effects into account. Moreover, the work describes how to model finite current-carrying rectangular segments (straight and arced) from first principles. Finally, the methodology was demonstrated for two prototype specimens with different bending-shapes corresponding to the fundamental elements on a stator bar in the winding overhang of large electrical machines.
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
Journal
IEEE transactions on energy conversion

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