Abstract: In an insulating system for high-voltage machines, a three-layer insulating tape is proposed as turn-to-turn insulation which comprises a center mica layer (1) which is covered on both sides by plastic foils (2,3) having different thickness. Thermoplastic adhesive layers (4,5) on the outer surfaces of the foils (2,3) produce an intimate bonding of the turn-to-turn insulation to the conductor elements and to the main insulation. An insulation of such construction is distinguished by a high electrical life at increased temperature and a high surge withstand capability.

Abstract: A method of securing one or more insulated winding components in the slots of a rotary electrical machine against any displacement during operation in which one or more inserts which have a deformable and heat-hardenable characteristic such as is established by a fibrous material impregnated with a heat-hardenable resin in the B-state, are inserted in the slot in contact with the adjoining side of a winding component. The winding components and non-hardened inserts are then subjected to pressure to effect a deformation matching any tolerance irregularity in the profile of the adjacent surface of the winding component, this step being followed by a gradual heating of the inserts while still under pressure so as to harden the same, and the entrance to the slot is then closed in the usual manner by insertion of a wedge.

Abstract: An arrangement for supporting insulated conductor components within the slots of the stator component of a dynamo-electric machine under compression so as to inhibit vibration thereof in which included with the one or more multi-conductor coil sections in the slot is a multi-layer resilient element including at least one felt layer and at least one hard layer, the ratio of the thickness of the felt layer to the hard layer preferably being 3 : 1 and the resilient element having a spring characteristic which is degressive in relation to the spring force.

Abstract: A rotary electrical machine is provided with a laminated stack of iron sheets in which slots are formed and winding conductors inserted therein, the entrances to the slots then being closed by insertion of slot keys along the slots. In order to maintain the winding conductors in each slot under compression and to apply a pressure against the slot keys, a row of ring-shaped disk springs in the form of a truncated cone and made from a glass fiber-reinforced synthetic resin is inserted in the slot between the slot key and the winding conductors prior to installation of the slot key. The diameter D of the truncated conical springs is made equal to the width of the slot and the central opening therein has a maximum diameter of 0.3 D.