A motor generator for electricity production, comprising: - a first component with a first containment structure for a motor and for a permanent magnet alternator mechanically connected to said motor, said first containment structure comprising first interconnection means electrically connected to the windings of said alternator, - a second component with a second containment structure for an electronic system adapted to convert the electricity received as input, said containment structure comprising at least one output connector connected to the output of said electronic conversion system and second interconnection means connected to the input of said electronic conversion system, and in that - said first interconnection means of said first containment structure can be mechanically coupled to said interconnection means of said second containment structure, - said first interconnection means comprise first electric contacts, electrically connectable to second electric contacts defined in said second interconnection means to transfer the electricity, generated by the alternator of said first component, to the input of the electronic conversion system of said second component, - said electric contacts of said first interconnection means are accessible from the outside and said windings of said alternator are electrically connected to said first electric contacts, - the configuration of the electrical connections of said second electric contacts of said second interconnection means is defined on the basis of the characteristics of the electricity desired by the user at the output of said motor generator,_wherein the configuration of the connections between said second electric contacts (21', 21") and said first electric contacts (20', 20"), and between the second electric contacts (21', 21") themselves, enables the voltage fed to the input of the electronic conversion system to be varied, - said at least one output connector is arranged to render the final electricity desired by the user accessible from the outside of said second containment structure. - a first component with a first containment structure for a motor and for a permanent magnet alternator mechanically connected to said motor, said first containment structure comprising first interconnection means electrically connected to the windings of said alternator, - a second component with a second containment structure for an electronic system adapted to convert the electricity received as input, said containment structure comprising at least one output connector connected to the output of said electronic conversion system and second interconnection means connected to the input of said electronic conversion system, - said first interconnection means of said first containment structure can be mechanically coupled to said interconnection means of said second containment structure, - said first interconnection means comprise first electric contacts, electrically connectable to second electric contacts defined in said second interconnection means to transfer the electricity, generated by the alternator of said first component, to the input of the electronic conversion system of said second component, - said electric contacts of said first interconnection means are accessible from the outside and said windings of said alternator are electrically connected to said first electric contacts, - the configuration of the electrical connections of said second electric contacts of said second interconnection means is defined on the basis of the characteristics of the electricity desired by the user at the output of said motor generator,_wherein the configuration of the connections between said second electric contacts (21', 21") and said first electric contacts (20', 20"), and between the second electric contacts (21', 21") themselves, enables the voltage fed to the input of the electronic conversion system to be varied, - said at least one output connector is arranged to render the final electricity desired by the user accessible from the outside of said second containment structure.