Assembly effects on stator cores of small synchronous reluctance motors

Abstract

The paper deals with manufacturing and assembly negative effects on stator cores of fractional-power synchronous reluctance motors. In particular, the experimental activities have been carried out on laminated stator cores used for machines having nominal powers of the range of 100 W–500 W. The considered stator core samples have been produced using two different fabrication technologies to stack together the lamination sheets: the clamping and the welding solution. The measured B-H magnetizing curves and the specific loss trends have been compared with results obtained testing a particular stator core produced with loose laminations (i.e. without clamping or welding). This ‘ad hoc’ magnetic core represents the baseline for the presented comparative study. The collected data have been used in finite element method simulations computing three factors of merit specifically defined to quantify the manufacturing impacts on small synchronous reluctance motors. In the present study, the pressing effect due to the insertion of the magnetic core inside the frame is also experimentally investigated.