Patent ID: 7923949

Claim:
A method of controlling a reversible polyphase rotary electrical machine operating in a motor mode as a motor, in a rectification mode as an alternator and in a controlled alternator mode transitioning between the motor mode and the rectification mode, the rotary electrical machine including a switch bridge ( 10 ) at least one coiled circuit ( 12 ) supplied through the switch bridge ( 10 ), the method comprising the following steps: controlling (P 1 ) the bridge ( 10 ) in the motor mode in order to deliver to the coiled circuit ( 12 ) a periodic voltage with a phase difference (δ) with respect to an electromotive force induced in the coiled circuit being in a range between an initial value (δ 0 ) and a first value (δ 1 ), such that a motor torque is generated, the initial value (δ 0 ) of the phase difference being higher than the first value (δ 1 ); controlling (P 2 ) the bridge ( 10 ) in the controlled alternator mode in order to deliver to the coiled circuit ( 12 ) the periodic voltage with the phase difference (δ) being in a range between the first value (δ 1 ) and a second value (δ 2 ) causing the production of a torque lying between the motor torque and a resisting torque of opposite sign to the motor torque, the phase difference taking a plurality of values during this control, the first value (δ 1 ) of the phase difference being higher than the second value (δ 2 ); and switching (T 2 ) the bridge ( 10 ) into the rectification mode.