The winding is wound directly on the toothless stator core. A Slotless winding provides a very large magnetic airgap between the stator and the rotor iron cores causing the self and mutual inductances to be extremely small. In addition, the obvious absence of the slot leakage flux further decreases the inductances. The end windings are very short so that the resistance is small, too. Permanent magnets are mounted on two rotor discs on both sides of the stator.