Abstract: An electric machine and method for forming the same comprises a rotor, a rotor winding disposed on the rotor and having a body portion and end turn portions, and a non-metallic cylinder arranged around the rotor to restrain both the body portion and the end turn portions of the winding against forces resulting from a rotation of the rotor. No portion of an inner circumference of the cylinder is smaller than an outer circumference of the rotor so that the cylinder may be slid around the rotor without obstruction during construction of the electric machine. The cylinder surrounds a body portion of the rotor and extends axially beyond end faces of the rotor and has a plurality of holes defined therethrough. The rotor includes a plurality of venting passages and at least one opening formed therein to allow a balance plug to be engaged therein.

Abstract: An electric machine and method for forming the same comprises a rotor, a rotor winding disposed on the rotor and having a body portion and end turn portions, and a non-metallic cylinder arranged around the rotor to restrain both the body portion and the end turn portions of the winding against forces resulting from a rotation of the rotor. No portion of an inner circumference of the cylinder is smaller than an outer circumference of the rotor so that the cylinder may be slid around the rotor without obstruction during construction of the electric machine. The cylinder surrounds a body portion of the rotor and extends axially beyond end faces of the rotor and has a plurality of holes defined therethrough. The rotor includes a plurality of venting passages and at least one opening formed therein to allow a balance plug to be engaged therein.

Abstract: An electric machine and method for forming the same comprises a rotor, a rotor winding disposed on the rotor and having a body portion and end turn portions, and a non-metallic cylinder arranged around the rotor to restrain both the body portion and the end turn portions of the winding against forces resulting from a rotation of the rotor. The cylinder is preferably a single integral cylinder made of a graphite epoxy. The cylinder surrounds a body portion of the rotor and extends axially beyond end faces of the rotor and has a plurality of holes defined therethrough. The rotor includes a plurality of slots formed therein to enable a plurality of venting passages to be established and at least one opening formed therein to allow a balance plug to be engaged into an opening. The cylinder also includes a protrusion on its inner periphery to engage a groove on the outer periphery of the rotor.