Loss and efficiency profiles of double stator permanent magnet machine
Keywords:
Efficiency, permanent magnet machine, rotor and stator iron losses.Abstract
Loss estimation of double stator permanent magnet machine is predicted in this study using finite element method. The influence of rotor speed, electric loading and stator/rotor pole combinations of the investigated machine is also quantified and compared. It is revealed that the machine types with odd number of rotor poles have larger iron loss values than their even rotor pole number counterparts. Moreover, the efficiency of the analyzed machine categories is also presented with the machine types having odd number of rotor poles taking the lead in efficiency profiles amongst all, owing to its larger output torque and power. The predicted peak efficiency of the compared machine types (i.e. the 10-, 11-, 13- and 14-pole machines) operated at 400 rpm is: 76.70 %, 86.88 %, 86.23 % and 79.92 %, respectively. Nevertheless, compared machine types have comparable overall loss values at rated load and machine speed of 400 rpm.
