Abstract: A rotating electric machine includes a housing having a first inlet at one end for admitting ventilation air for cooling the machine, and a second inlet at the other end which also admits cooling air into the machine. A fan located at one end of the housing draws air into the housing through the first and second inlets, and forces it out of the housing through a single outlet located near one end of the housing. Air entering the second inlet passes through openings in the fan carrier, cooling isolated areas of the rotor, and flowing through the fan blades with the air which enters through the first inlet.

Abstract: A method of insulating a field coil of an electric traction motor, comprising the steps of encapsulating the coil in flexible ground insulation, temporarily mounting the insulated coil on a field pole piece, wrapping heat shrinkale material around the perimeter of the insulated coil, said material being so composed, oriented, and applied as to shrink irreversibly, when subsequently heated, in a direction tending to constrict the whole outside perimeter of the insulated coil, attaching the base of the pole piece to a concave surface of the magnet frame of the motor in a manner that compactly clamps the coil between the frame and an overhanging distal end of the pole piece, heating the perimeter wrap so that it shrinks appreciably and tightly binds the underlying ground insulation, thereby counteracting any tendency of the ground insulation to become slack on the outside of the coil when the coil was clamped in place, and filling any remaining voids inside the ground insulation with varnish or resin in a conven