Hair Pin motors: possible impregnation and encapsulation techniques, materials and variables to be considered

Abstract

This paper presents several solutions for the coverage of Hair Pin welding in flat wire electrical motors. It is discussed what to keep in mind when selecting a material to insulate the uncovered hair pins as well as how to choose the application technique. The techniques covered in this paper are Dip&Bake, Trickling, Encapsulation, Hot Dip and Powder Coating. Examples of materials and process parameters will be described as well as evaluation results on a prototype Hair Pin stator.