Abstract: The winding for an electric machine comprises transposed bars having at least four stacks of strands. Couples of stacks of strands define elementary transposed bars. The winding comprises at least two stacks of cooling pipes in each transposed bar, each stack of cooling pipes being arranged between two stacks of strands, and at least one crossover transposed bar in which the sides of the elementary transposed bars are exchanged.

Abstract: A stator winding of a directly cooled turbogenerator comprises directly gas cooled double Roebel bars is arranged as active parts in slots of a stator body. Each double Roebel bar has two single Roebel bars, which includes each a stack of a plurality of transposed individual strands, and are separated by an intermediate stack of cooling tubes. Mounting space is saved by constructing, for the compensation of stray field voltages, at least one double Roebel bar as a cross-over bar with the strands being transposed over the stack of cooling tubes in the middle in order to change the sides of the single Roebel bars along the active part.

Abstract: The present disclosure relates to brushes to transfer electric direct current from a current source to a rotor of an electric machine to electrically excite the rotor. It is an object of the disclosure to reduce the wear of brushes in electric machines. To this end a brush lifter for an electric machine with a spring to exert a pressure to a brush in the direction of a rotor is disclosed. The brush lifter has an inflatable gas bag fed via a feed with gas by a compressor, which is controlled by a processor, to lift off or drop the brush from the rotor via a hanger, wherein the brush is lifted when the gas bag is inflated and exerts a force to lift the hanger and the connected brush.

Abstract: Embodiments of the present invention relate to a winding of a rotor for use in rotating electrical machines. More particularly, embodiments of the present invention relate to innovative half-coils used for the winding of the rotor. Moreover, embodiments of the invention pertain to a method for winding a rotor body of an electrical machine. According to embodiments of the invention, half-coils, instead of being manufactured as double hollow conductors, are provided in the form of two single hollow conductors, which are adjacently embedded within a respective slot of the rotor body.

Abstract: The winding for an electric machine comprises transposed bars having at least four stacks of strands. Couples of stacks of strands define elementary transposed bars. The winding comprises at least two stacks of cooling pipes in each transposed bar, each stack of cooling pipes being arranged between two stacks of strands, and at least one crossover transposed bar in which the sides of the elementary transposed bars are exchanged.

Abstract: Apparatus for producing electrical power from mechanical power, includes an electric generator with a rotor and with a stator. The electric generator is configured for conversion of mechanical power into a polyphase alternating current. The polyphase alternating current has more than three phases. The stator has a stator core with a stator bore. The stator core provides a plurality of stator slots arranged at a distance from one another. A plurality of coil portions are inserted in the stator slots, and the coil portions are connected to form coils. The coils include a plurality of Z-shaped portions and are laid out in a wave pattern.

Abstract: A connection arrangement is provided for the windings of an electric machine and includes a plurality of phase connections, each phase connection including conductors, each conductor having an annular or annular sector shape and includes a plurality of connecting ends. The conductors of each phase connection are radially shifted.

Abstract: A conductor bar including a plurality of Roebel-transposed conductor elements is disclosed. At least one of the conductor elements possesses a plurality of conductive strands stacked relative to each other. The strands used to form the at least one conductor element follow a common path within the conductor bar. An insulator electrically insulates the conductor elements from each other. Also provided are a method of manufacturing a conductor bar and an electric machine including a plurality of conductor bars.

Abstract: A high voltage stator bar includes a substantially quadrangular conductive element made of a plurality of interwoven strands, and an electric insulation applied around the conductive element. The permittivity at the corners of the electric insulation decreases by less than 60% from an inner insulation zone facing the conductive element towards an outer insulation zone.

Abstract: A stator bar includes a substantially quadrangular conductive element made of a plurality of interwoven strands. The stator bar also includes an electric insulation applied around the conductive element and including a plurality of corners corresponding to corners of the conductive element. The electric insulation includes an inner insulation zone facing the conductive element, and an outer insulation zone surrounding the inner insulation zone. The radius of at least one of the corners is between 1.5-2.5 millimeters. Permittivity at the corners of the electric insulation decreases by 35-45% from the inner insulation zone facing the conductive element towards the outer insulation zone. The insulation includes at least one mica layer, where one of the at least one mica layer includes titanium dioxide (TiO2).

Abstract: A method for regulating the reactive power generated or absorbed by a synchronous electric generator includes regulating a quantity of coils disposed in line with a stator winding. Additionally, a generator operating point of the generator is regulated.

Abstract: Apparatus for producing electrical power from mechanical power, includes an electric generator with a rotor and with a stator. The electric generator is configured for conversion of mechanical power into a polyphase alternating current. The polyphase alternating current has more than three phases. The stator has a stator core with a stator bore. The stator core provides a plurality of stator slots arranged at a distance from one another. A plurality of coil portions are inserted in the stator slots, and the coil portions are connected to form coils. The coils include a plurality of Z-shaped portions and are laid out in a wave pattern.

Abstract: A stator winding of a directly cooled turbogenerator comprises directly gas cooled double Roebel bars is arranged as active parts in slots of a stator body. Each double Roebel bar has two single Roebel bars, which includes each a stack of a plurality of transposed individual strands, and are separated by an intermediate stack of cooling tubes. Mounting space is saved by constructing, for the compensation of stray field voltages, at least one double Roebel bar as a cross-over bar with the strands being transposed over the stack of cooling tubes in the middle in order to change the sides of the single Roebel bars along the active part.

Abstract: A connection arrangement is provided for the windings of an electric machine and includes a plurality of phase connections, each phase connection including conductors, each conductor having an annular or annular sector shape and includes a plurality of connecting ends. The conductors of each phase connection are radially shifted.

Abstract: A high voltage stator bar includes a substantially quadrangular conductive element made of a plurality of interwoven strands, and an electric insulation applied around the conductive element. The permittivity at the corners of the electric insulation decreases by less than 60% from an inner insulation zone facing the conductive element towards an outer insulation zone.

Abstract: A flux screen is provided for shielding a generator stator core from the magnetic field generated by end windings of the stator, wherein the flux screen comprises a frontside to be at least indirectly facing the end windings of the generator and a backside to be at least indirectly facing the stator core of the generator, and wherein the backside is provided with channels and/or grooves and/or pits.

Abstract: A method for regulating the reactive power generated or absorbed by a synchronous electric generator includes regulating a quantity of coils disposed in line with a stator winding. Additionally, a generator operating point of the generator is regulated.

Abstract: A rotating electrical machine, especially a turbogenerator, includes a rotor and a stator, which concentrically surrounds the rotor and is terminated at each of the two axial ends by a laminated press plate (14), which is constructed from a stack of individual press plate laminates (30). The electrical properties are improved by providing the press plate laminates (30) at least partially with slits (26) for reducing the eddy current losses.

Abstract: A flux screen is provided for shielding a generator stator core from the magnetic field generated by end windings of the stator, wherein the flux screen comprises a frontside to be at least indirectly facing the end windings of the generator and a backside to be at least indirectly facing the stator core of the generator, and wherein the backside is provided with channels and/or grooves and/or pits.

Abstract: A stator winding bar comprises a plurality of strands that are transposed in the manner of a Roebel bar in an active part having a prescribed length, the active part being divided into several areas having different lengths arranged one after the other, in each area a transposition of the strands by a prescribed angle magnitude is provided, wherein the crimping distance within each area varies.