Effect of toothless stator design and core and stator conductors eddy current losses in permanent magnet generators

Some advantages of toothless stator design in high-speed permanent magnet generators are presented. A computer-aided method was implemented to study the effect of stator teeth on the eddy current loss in the stator conductors as well as the core loss in the laminations of high-speed permanent magnet generators. The computer-aided method was applied to a 75 kVA, 208 V, 400 Hz, two-pole, permanent magnet generator. A validation of the computed flux density values based on experimentally obtained data is given. Two particular designs, a toothless stator and a conventional stator (with iron teeth), are considered. The conductor eddy current loss and the laminations´ core losses are estimated and compared for both designs. The results of a study on the effect of conductor size on the stator conductor eddy current loss are given