Method for controlling polyphase rotating electrical machine

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 (P1) 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 (δ0) and a first value (δ1), such that a motor torque is generated, the initial value (δ0) of the phase difference being higher than the first value (δ1);
• controlling (P2) 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 (δ1) and a second value (δ2) 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 (δ1) of the phase difference being higher than the second value (δ2);
• and
• switching (T2) the bridge (10) into the rectification mode.