DocumentCode :
1522396
Title :
Design and Analysis of Star–Delta Hybrid Windings for High-Voltage Induction Motors
Author :
Lei, Yi ; Zhao, Zhengming ; Wang, Shuping ; Dorrell, David G. ; Xu, Wei
Author_Institution :
Dept. of Electr. Eng., Tsinghua Univ., Beijing, China
Volume :
58
Issue :
9
fYear :
2011
Firstpage :
3758
Lastpage :
3767
Abstract :
In this paper, a Y-Δ hybrid connection for a high-voltage induction motor is described. Low winding harmonic content is achieved by careful consideration of the interaction between the Y- and Δ-connected three-phase winding sets so that the magnetomotive force (MMF) in the air gap is close to sinusoid. Essentially, the two winding sets operate in a six-phase mode. This paper goes on to verify that the fundamental distribution coefficient for the stator MMF is enhanced compared to a standard three-phase winding set. The design method for converting a conventional double-layer lap winding in a high-voltage induction motor into a Y-Δ hybrid lap winding is described using standard winding theory as often applied to small- and medium-sized motors. The main parameters addressed when designing the winding are the conductor wire gauge, coil turns, and parallel winding branches in the Y and Δ connections. A winding design scheme for a 1250-kW 6-kV induction motor is put forward and experimentally validated; the results show that the efficiency can be raised effectively without increasing the cost.
Keywords :
air gaps; induction motors; magnetic forces; stators; wires (electric); MMF; Y-Δ hybrid lap winding; air gap; coil turns; conductor wire gauge; distribution coefficient; induction motors; magnetomotive force; parallel winding branches; power 1250 kW; star-delta hybrid windings; stator; three-phase winding; voltage 6 kV; Air gaps; Design methodology; Induction motors; Magnetic analysis; Stator windings; Windings; High efficiency; Y–$Delta$ hybrid connection; high-voltage induction motors; six-phase winding;
fLanguage :
English
Journal_Title :
Industrial Electronics, IEEE Transactions on
Publisher :
ieee
ISSN :
0278-0046
Type :
jour
DOI :
10.1109/TIE.2010.2054058
Filename :
5492208
Link To Document :
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