Rotating electrical machine with concentration flux rotor and teeth-wound stator

A rotating electrical machine has a rotor (200) with flux concentration and permanent magnets which are located between pole pieces and a stator (100) with wound teeth. The shape of the pole pieces and the magnets are chosen so that the difference Ld-Lq is minimal, where Ld is the direct axis inductance and Lq is the quadrature axis inductance. The teeth do not have a constant size. They become bigger with increasing distance from the rotor going out from a certain distance from their free end.