Rotor for electric motor optimized for high power

A rotor for a high speed and high power electrical motor comprising:

• a magnetic mass along a longitudinal axis of the rotor, the magnetic mass formed by assembling magnetic sheets, gripped on either side by short circuit rings, the magnetic mass having a plurality of notches;
• and
• electric conductors passing through the magnetic mass at the plurality of notches and connecting the short circuit rings to form a squirrel cage;
• the electric conductors having, on at least part of their length, an oblong section with a large axis extending substantially radially in relation to the longitudinal axis of the rotor;
• the electric conductors being formed by assembling main bars and secondary bars passing through the magnetic mass via the notches, a shape and arrangement of each notch being defined so as to ensure contact between the main bars and the secondary bars sufficient to allow the passage of an electric current when the rotor is in rotation, the secondary bars being made of the same material as the main bars;
• each secondary bar having a length smaller than a length of the magnetic mass to permit a clearance between each secondary bar and the short circuit rings and ensuring a free longitudinal expansion of the secondary bar in a respective notch pf the notches.