End ring damping structure for dynamoelectric machines

Abstract From the Canadian patent

A rotor in a dynamoelectric machine of the squirrel cage type has a stack of laminations clamped at either end by a clamping ring and mounted to a rotor shaft. The stack of laminations has a plurality of axially extending peripheral openings with a rotor bar mounted in each opening and projecting from either end. An end ring at each end is electrically connected to the projecting ends of the rotor bars. The rotor bars and the end rings form a sub-assembly. The clamping ring at each end has fingers which extend radially between the projecting ends of adjacent rotor bars. The fingers adjacent and on either side of at least one rotor bar have damper block retaining pockets on the side thereof …