Patent ID: 7531935
Filing Date: 2009-05-12
Classification: H02K

Abstract:
1. A multiphase rotary electrical machine comprising: bridge rectifiers; a stator disposed within a casing, the stator comprising a stator body having recesses: and a rotor surrounded by the stator; the stator further comprising a three-phase star winding and a three-phase delta winding, the outputs of the star winding and three-phase delta winding being connected to the bridge rectifiers connected to each other in parallel between earth and a common output terminal; the two windings being received together in the recesses in the stator body; the ratio of the number of turns of the windings in the star winding and the delta winding is chosen so that the number of turns in each winding is an integer number, whilst keeping the ratio of these numbers of turns as close as possible to √3 and as small as possible; wherein the number of turns on the star winding and the number of turns on the delta winding are respectively 3 and 5, wherein the diameter of the wire in the star winding is different from the diameter of the wire in the delta winding such that the diameters are chosen so that the ratio of the transverse sections of the two windings is close to the value √3, and such that the diameters of the star and delta stator windings are chosen so as to obtain a fill factor of the recesses in the stator greater than 50%, and wherein the star winding is formed by two wires in parallel wound in distributed mode.