Influence of stator tooth thickness on losses and efficiency of a double stator electric machine

Abstract

Owing to the significant impacts of the electric machine's structural dimensions on its output characteristics and values, the effect of stator tooth thickness and shape is considered in this study. Finite element analysis is employed in the predictions. The machine parameters considered are magnetic properties, efficiency, and losses. It is revealed that if the analyzed machine has unequal stator tooth thickness without a stator tooth tip, then the resulting magnetic properties and eddy current loss values would be high; however, with improved overall machine efficiency. Consequently, a similar machine configuration that has equal stator tooth thickness with a stator tooth tip would exhibit larger total loss and a corresponding lower overall efficiency. The predicted magnetic coercive force values of the machine with and without equal stator tooth thickness are: 1415.51 kA/m and 1505.92 kA/m, respectively. Again, the resulting total losses of the machine with and without equal stator tooth thickness are 19.71 Watts and     19.16 Watts, respectively. Moreover, the improved machine type with unequal stator tooth thickness generated an efficiency of 92.83 % against its counterpart, which produced a corresponding efficiency of 92.60 %.