Mike Howell, PE
EASA Technical Support Specialist 

This article should be helpful to anyone working with a winding that meets the following criteria: 

1. Three-phase, two-layer lap winding 
2. Unequal-turn (odd turn) winding 
3. Integer-group winding (same number of coils in every group) 

The purpose of this article is to provide some tips for working with unequal-turn (odd-turn), two-layer lap windings, with emphasis on how to sequence the coils within the group for optimum slot fill. For these windings, the total number of turns in at least some of the slots is an odd integer greater than 1, i.e., 3,5,7,9…n. This means that the top and bottom coil sides in those slots have a different number of turns.

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Categories: Technical topics, AC motors, Stators/windings, Winding connections

Tags: Odd turns

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