Development and Testing of a Measurement Device for Prediction of Stator Core Quality

In the past, and still today it has been hard to find good methods to locate and determine the magnitude of the iron losses in stator cores and from that obtain an overall quality check. In order to meet the future demands on high-effeciency motors with high power density it is essential to have a good knowledge where the stator losses are located and what size they have in specific parts of the stator. This paper presents a method to measure the stator core losses in different parts of the stator by means of a measurement device and determine the relative stator losses in the different parts. The paper gives a hint how to design an appropriate measurement device for a stator with certain dimensions. In the end of the paper results from measurements on sttator cores with different sheet qualities are presented.