Abstract: A stator for an electrical machine includes a stator yoke and a plurality of stator teeth extending radially inwards from the stator yoke, the stator teeth defining stator slots for stator windings. A plurality of auxiliary teeth extend radially inwards from the stator yoke into the stator slots. At least some of the auxiliary teeth comprise cooling channels. A conduit is arranged to carry coolant circumferentially around the stator and into the cooling channels in the auxiliary teeth.

Abstract: A stator for a rotating electrical machine is disclosed. The stator comprises a plurality of stator teeth wound with stator windings. The stator windings on each tooth comprise at least two parallel conductors which are wound as separate coils. The coils on one tooth are transpose connected with the coils on another tooth. This may help to reduce or eliminate circulating currents, while at the same time minimizing AC losses.