Reversible electrical machine for an aircraft

A reversible electrical machine comprising:

• a first electrical device having a first rotor configured to cooperate with a first stator;
• a second electrical device including a second rotor configured to cooperate with a second stator;
• first disengageable coupling means that enables said first and second rotors to be associated and dissociated in rotation;
• an outlet shaft;
• and
• second disengageable coupling means that are disengageable under a first predetermined force and that mechanically connect said second rotor to said outlet shaft;
• wherein said first electrical device is a motor for transmitting mechanical power to said outlet shaft and said second electrical device is a motor-generator for operating in motor mode to transmit additional mechanical power to said outlet shaft, and in generator mode for receiving mechanical power from said outlet shaft, and wherein said second motor includes a bore associated with said second rotor, and said second coupling means include a fuse element connecting said bore and said outlet shaft together in rotation, said fuse element being breakable under said first predetermined force in order to dissociate said bore from said outlet shaft.