Abstract: A filler-impregnatable device for a large electric machine, such as a stator or a rotor, includes a carrier body having slots formed therein defining slot walls. Conductor windings have conductor devices disposed in the slots associated therewith. Impregnatable insulating layers each surround a respective one of the conductor devices. Impregnatable first semiconductor layers each envelope a respective one of the insulating layers. At least one impregnatable second semiconductor layer is disposed between the first semiconductor layer of each respective conductor device and at least one of the slot walls of the associated slot. The at least one second semiconductor layer is electrically connected to the first semiconductor layer of each respective conductor device. Filler-permeable separating layers are each disposed between the first semiconductor layer and the at least one second semiconductor layer of each respective conductor device.

Abstract: A method for determining overheating in liquid-cooled windings of electric machines includes acoustically monitoring cooling liquid with at least one sound pickup, and detecting noises generated by bubbles in the event of local overheating if the boiling point of the cooling liquid is exceeded. An apparatus is also provided for carrying out the method.

Abstract: Method of bracing winding end turns of an electric machine includes wrapping a first binding tape transversely around a pair of winding bars forming the end turns and disposed spaced from and substantially parallel to one another, wrapping a second binding tape transversely about the wrapped first binding tape in the space between the pair of winding bars so that the wrapped first and second binding tapes and the mutually opposing surfaces of the parallel winding bars define an inner space within, and injecting a flowable, cold hardenable cement mass into the inner space, and introducing into the space between the winding bars at the location of the inner space subsequently defined by the wrapped first and second binding tapes and the winding bars, and before injecting the cement mass into the inner space, a spacer member defining and predetermining the spacing between the pair of winding bars and having a shape that affords penetration of the cement mass from a given point of injection to all of the spaces a