Rotor with a damper screen for an alternator with projecting poles

Claim 1

A rotor for an alternator with a damper screen, said rotor including: a longitudinal rotation axis; a magnetic circuit including poles which project radially outwardly, extend longitudinally and are spaced out angularly about the rotation axis, each pole including a polar core and ending radially outwardly in a projecting pole piece whose edges project angularly on either side of the polar core; exciter windings positioned between the polar cores; damper bars formed of a good electrical conductor and extending longitudinally without discontinuity along the whole length of the poles including polar damper bars extending through the poles and interpolar damper bars disposed between the poles; and two conductor rings disposed coaxially with the rotor at respective ends thereof and electrically connected to respective ends of each damper bar to form with these bars a damper screen of the squirrel cage type; the improvement wherein the interpolar bars of said rotor extend longitudinally the length of said poles and each includes: a shoe which presses against the inside surface of the edge of at least one of the projecting pole pieces, over the longitudinal length thereof; and at least one wing integral with the shoe and extending over more than half the radial gap occupied by the neighbouring projecting pole pieces and throughout the longitudinal extent thereof and located adjacent the end of said at least one projecting pole piece edge.