Abstract: The present disclosure relates to a stacker and a method to assemble a stator core of an electric machine. Disclosed is a method for stacking a stator core of an electric machine, with the steps of providing a support adjacent to the stator frame to carry at least a sheet for the stator core, grabbing the at least a sheet with an arm arranged outside the stator core, the arm has a holding device for clamping the at least a sheet, guiding the at least a sheet inside the stator frame in a horizontal direction, and arranging the at least a sheet to compose the stator core.

Abstract: The present disclosure relates to a method to apply an insulation to a retaining ring for end windings of an electric machine and to a fillable bag to apply an insulation to a retaining ring. Disclosed is a method to apply an insulation to a retaining ring for end windings of an electric machine, with the steps of providing a retaining ring housing, attaching an insulation at the inside of the retaining ring housing, and inflating a bag inside the retaining ring housing to apply pressure to the insulation. Also disclosed is a fillable bag to apply a pressure to an electric insulation inside a retaining ring for end windings of an electric machine.

Abstract: A method and an arrangement is provided for measuring the tightness of a core composed of laminated sheets used in an electric machine. The method for measuring the tightness of a core of an electric machine composed of sheets, includes supplying a sound wave to the core, measuring the speed of the sound wave in the core, and deducing the tightness of the core from the measured data. The arrangement to measure the tightness of a core of an electric machine composed of sheets, includes a hammering system to pound at the core for generating a sound wave in the core, at least two accelerometers arranged at the core at an axial distance for measuring the speed of the sound wave, and a computer to deduce the tightness of the core from the measured data.

Abstract: The method for manufacturing a stator of an electric machine includes providing a lamination element extending over an annular sector, horizontally moving the lamination element towards a fitting zone, then angularly regulating the lamination element position, and connecting the lamination element to other lamination elements to define the stator.

Abstract: A leakage tightness testing system and a method for checking a tightness of a test vessel having a test vessel internal volume and a test vessel thermal inertia characteristic are provided. The leakage tightness testing system includes an external reference vessel coupled in flow communication to the test vessel. The external reference vessel includes an external reference vessel volume that includes an insulative material layer at least partially covering the external reference vessel. The insulative material layer is configured to approximately match a thermal inertia characteristic of the external reference vessel to the thermal inertia characteristic of the test vessel. The leakage tightness testing system also includes a leakage testing device coupled in flow communication to the test vessel and the external reference vessel. The leakage testing device includes a leakage sensor.

Abstract: The method for removing a bar or coil from a slot of an electric machine includes weakening the bonding between the slot and the bar or coil, and then removing the bar or coil.

Abstract: A cutting device for cutting a wedge and/or conductive bar or coils and/or part of thereof within a slot of an electric machine includes a saw with at least a blade, a guide for guiding the saw during cutting, the guide being connectable to the electric machine. The saw and the guide are withheld together preventing their separation.

Abstract: The present disclosure relates to a method to apply an insulation to a retaining ring for end windings of an electric machine and to a fillable bag to apply an insulation to a retaining ring. Disclosed is a method to apply an insulation to a retaining ring for end windings of an electric machine, with the steps of providing a retaining ring housing, attaching an insulation at the inside of the retaining ring housing, and inflating a bag inside the retaining ring housing to apply pressure to the insulation. Also disclosed is a fillable bag to apply a pressure to an electric insulation inside a retaining ring for end windings of an electric machine.

Abstract: The method for manufacturing a stator of an electric machine includes providing a lamination element extending over an annular sector, horizontally moving the lamination element towards a fitting zone, then angularly regulating the lamination element position, and connecting the lamination element to other lamination elements to define the stator.

Abstract: The present disclosure relates to a stripping tool, a method to strip a conductor bar, and an arrangement for stripping a conductor bar from a slot of a core of an electric machine. The disclosure provides a device and a method to facilitate the removal of a conductor bar out of a slot of an electric machine. A stripping tool for removing a conductor bar out of a slot of a core of an electric machine is described, with a piston and a support to apply the piston to the core, a rope to be wound around the conductor bar, and a puller suitable to move the rope vertically to the core to pull the conductor bar out of the slot by means of the rope. Also disclosed is a method to strip a conductor bar out of a slot of a core of an electric machine.

Abstract: An epoxy resin formulation is disclosed, comprising at least an epoxy resin of the type of bisphenol A or F, at least a hardener of type diamine, e.g. polyoxypropylendiam or polyoxypropylenetriamine, and with or without an aliphatic diamine having benzene ring e.g. Xylylenediamine and at least an inorganic filler. Further disclosed is a support to surround end windings of a stator of an electric machine, the support made from an epoxy resin formulation and the use of an epoxy resin as support. Further disclosed is a method to fabricate an epoxy resin formulation , including mixing, with a temperature between 15° C. and 35° C., at least an epoxy resin of the type of bisphenol A or F, at least a hardener of type diamine, e.g. polyoxypropylendiam or polyoxypropylenetriamine, and at least an inorganic filler, casting the epoxy resin formulation with a temperature between 15° C. and 35° C., and postcuring the epoxy resin formulation for several hours with a temperature between 60° C. and 100° C.

Abstract: A method and an arrangement is provided for measuring the tightness of a core composed of laminated sheets used in an electric machine. The method for measuring the tightness of a core of an electric machine composed of sheets, includes supplying a sound wave to the core, measuring the speed of the sound wave in the core, and deducing the tightness of the core from the measured data. The arrangement to measure the tightness of a core of an electric machine composed of sheets, includes a hammering system to pound at the core for generating a sound wave in the core, at least two accelerometers arranged at the core at an axial distance for measuring the speed of the sound wave, and a computer to deduce the tightness of the core from the measured data.

Abstract: The method for manufacturing a stator of an electric machine includes providing a lamination element extending over an annular sector, horizontally moving the lamination element towards a fitting zone, then angularly regulating the lamination element position, and connecting the lamination element to other lamination elements to define the stator.

Abstract: The present disclosure relates to a stacker and a method to assemble a stator core of an electric machine. Disclosed is a method for stacking a stator core of an electric machine, with the steps of providing a support adjacent to the stator frame to carry at least a sheet for the stator core, grabbing the at least a sheet with an arm arranged outside the stator core, the arm has a holding device for clamping the at least a sheet, guiding the at least a sheet inside the stator frame in a horizontal direction, and arranging the at least a sheet to compose the stator core.

Abstract: The present disclosure relates to a method for manufacturing the windings of rotating electrical plant.

Abstract: A method is provided for testing the tightness of an electric machine stator core includes: introducing a test instrument that is connected to a movable support into an air gap between a stator core and a rotor, locally placing the test instrument and locally testing defined zones of the generator stator core. A device for carrying out the method is also provided.

Abstract: The disclosure refers to a method for manufacturing winding parts for an electric machine. The winding parts include a conductor and insulation around it. The method includes providing the conductor with an insulating tape around it, providing dies above the insulating tape, providing a thermosetting layer around the dies, impregnating the insulating tape with a resin, curing the resin to realise the insulation, removing the thermosetting layer and the dies.

Abstract: The method for removing a bar or coil from a slot of an electric machine includes weakening the bonding between the slot and the bar or coil, and then removing the bar or coil.

Abstract: The method for manufacturing a stator of an electric machine includes providing a lamination element extending over an annular sector, horizontally moving the lamination element towards a fitting zone, then angularly regulating the lamination element position, and connecting the lamination element to other lamination elements to define the stator.

Abstract: A cutting device for cutting a wedge and/or conductive bar or coils and/or part of thereof within a slot of an electric machine includes a saw with at least a blade, a guide for guiding the saw during cutting, the guide being connectable to the electric machine. The saw and the guide are withheld together preventing their separation.