Original scientific paper

https://doi.org/10.31803/tg-20180301185613

Influence of strands transposition on current distribution and power losses in windings of AC machines

Branko Tomičić orcid.org/0000-0001-6519-0421 ; Končar Generators and Motors Inc., Zagreb, Croatia
Ladislav Havaš orcid.org/0000-0002-5051-4486 ; University North, University Center Varaždin, Varaždin, Croatia
Dunja Srpak orcid.org/0000-0003-1497-9080 ; University North, University Center Varaždin, Varaždin, Croatia

Abstract

This paper analyses how the type of winding affects the current distribution and power losses in armature winding. Using finite element method, four different types of winding used in large asynchronous motors are analyzed: form-wound concentric, with and without transposition, and form-wound barrel, with and without transposition, for the stationary state. In two cases, the calculation shows clear differences between maximum currents in strands, a shift in their phases, and a resulting increase of AC resistance. In two other cases, minor deviations, smaller phase shift and smaller increase of AC resistance, are detected. It indicates that in certain types of armature winding of large motors the strands transposition leads to significant positive effects in terms of motor power, while in other cases it leads to unnecessary complications making the manufacture of large asynchronous machines more difficult, with relatively small positive effect on the motor power losses.

Keywords

AC machines; conductors; finite element method; losses; windings

Hrčak ID:

202357

URI

https://hrcak.srce.hr/202357

Publication date:

15.6.2018.

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