Loss and efficiency comparisons of permanent magnet machine having double stator structure

Abstract

Loss quantity and efficiency profiles of a double stator permanent magnet machine (DSPMM) would be studied. The considered loss components are: Magnet eddy current loss, rotor iron loss, stator iron loss and total loss; undertaken at varying load current, rotational speed and rotor angular position. Additionally, the effect of different rotor pole numbers on loss and efficiency values of the investigated DSPMM would also be presented. The predicted results are estimated with Maxwell-2D version 15.0 simulation software, using finite element analysis method. The results show that both the electric load and motor speed, in addition to the machine’s pole number, would influence the resultant amount of loss and efficiency in the machine. Meanwhile, the resulting amount of total loss in the system would be proportional to the implemented pole number i.e. the higher the pole number, then, the larger the resulting total loss value. The predicted total loss of the machine at a rotating speed of 3200 rpm is approximately equal to 84.70 W, 84.78 W, 88.05 W and 89.91 W, respectively from the compared 10-pole, 11-pole, 13-pole and 14-pole machine topologies. The machine’s efficiency at rated speed and current is: 81.38 %, 89.27 %, 88.58 % and 83.10 %, i.e., from the considered respective pole numbers.