Abstract: In a dynamoelectric machine, electrical windings are held within the dynamoelectric machine rotor in axially extending slots which further include coextensive subslots for ventilation purposes. Slot insulation or slot armor is used to electrically insulate the windings from the dynamoelectric machine rotor. The slot insulation is retained in the slot by a plurality of subslot covers each of which includes a radially inner member, a radially outer member and further may include an end member. The inner members are formed at each end with a pinetree dovetail and include ventilation slots whereas the outer members are formed with ventilation half slots and depending tines. In assembly, the inner and outer members are staggered with respect to one another so that the outer member tines engage two different inner members to further strengthen the joint. The outer members included rabbeted ends so as to form overlapping joints with adjacent members to reduce electrical leakage paths.

Abstract: In a dynamoelectric machine including a rotor of electrically conductive material having a plurality of axially extending slots for receiving electrical conductors, there is provided apparatus in each slot for electrically insulating the conductors from the rotor. The insulating apparatus comprises a substantially U-shaped insulating member of an aramid paper extending axially along the length of the slot. The base of the U-shaped insulating member is held in position by a sub-slot cover formed of an extruded plastic material which has an inner member covering an axially extending sub-slot located beneath each of the conductor slots of the rotor and an outer member which fits over the top of the base of the U-shaped insulation member and latches into the inner member.

Abstract: A slot armor for insulating the slots in the rotor of a dynamoelectric machine from the windings contained in the slots includes a high-dielectric film on at least one surface thereof. A layer of a tough lubricating solid is coated on the exterior surface of the film. The lubricating solid prevents abrasion of the film by radial motion of the windings with respect to the slot armor or radial motion of the slot armor with respect to the slots. In the preferred embodiment of the invention, a substrate of glass fiber/epoxy composite has a polyimide polymer film bonded to the surface thereof. The lubricating solid coating on the external surface of the polyimide polymer film is an FEP fluorocarbon.

Abstract: In a dynamoelectric machine, the rotor comprises a solid steel drum formed with axially extending channels which carry electrically-conductive windings. These windings are electrically insulated from the rotor body by so-called slot insulation. The present invention proposes an integrally formed composite insulation comprising aramid paper slot armor and an epoxy-glass sub-slot cover.

Abstract: In a dynamoelectric machine having a rotating field and a stationary stator core, electrical conductors are contained within axially-extending radial slots which are part of the stator core construction. These electrical conductors are subject to electromagnetic forces and thermal cycling effects which, over a period of time, tend to cause the electrical conductors to become loose within their slots. A system of wedges is used to retain these electrical conductors in place and in particular a dovetail wedge is used in combination with a mating surface in a stator slot.