| abstract |
The device according to the invention controls a polyphase inverter ( 10, 14, 17 ) intended for powering from a DC current source (CC) a polyphase rotating electric machine ( 1 ). The device is of the type of those generating commutation functions driving commutation elements ( 9, 13 ) of the inverter in such a way as to obtain a reduction of the losses in the commutation elements and a decrease of an effective current in a decoupling capacitor ( 16 ) of the source (CC). According to the invention, this reduction and this decrease are obtained by means of a set of control strategies ( 21, 24 ) determining the commutation functions by using additional degrees of freedom of the polyphase machine ( 1 ) with respect to a three-phase reference machine. The polyphase machine comprises first and second phase windings forming a first three-phase system ( 2, 3, 4 ) and a second three-phase system ( 5, 6, 7 ) with distinct neutral points ( 11, 15 ) offset angularly by a predetermined angle of offset (Θ). The first and second phase windings are linked respectively to three first and three second power arms ( 8, 12 ) formed by the commutation elements. |