Patent ID: 8421296

Claim:
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 a length of said electric conductors, 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 such that said contact allows a passage of an electric current when the rotor is in rotation, the secondary bars being made of 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 of the notches.