Abstract: A rotor of a dynamo-electric machine having the conductors of the rotor winding constrained against the effects of centrifugal force by a plurality of annular members which encircle the conductors at spaced positions along the body of the rotor and are prestressed to clamp the conductors to the rotor so that no further stretching of the annular members occurs at the maximum speed of the rotor. Preferably the annular members are prestressed in situ on the rotor by expansible devices interposed between the annular members and the conductors of the rotor winding. One form of expansible device comprises an inflatable bag into which is pumped synthetic resin under pressure, the resin being cured so that it becomes solid while in the pressurized condition.

Abstract: A rotor of a dynamo-electric machine having the conductors forming an end-winding supported by an annular support arrangement interposed between an overhang region of the rotor body and the conductors forming the end winding. The annular support arrangement may comprise a single annular member or a plurality of separate members secured around the overhang region of the rotor body. The annular support arrangement may be formed from a non-magnetic metal of low density, for example, an aluminium alloy, or may be formed from a suitable insulating material, for example, a fibre reinforced composite material.