Abstract: A method for welding a plurality of wire segment pairs is disclosed. Each wire segment pair has two adjacent wire segments, and each adjacent wire segment has a contact region where the wire segment is to be welded to the respective other wire segment. The wire segment pairs are successively guided between two elements of a pressing unit, and at a weld moment in which at least one of the wire segment pairs is located between the two elements. The pressing unit exerts a pressing force onto the wire segment pair such that the contact regions of the wire segments are pressed against each other. At each weld moment, laser radiation is irradiated onto the wire segment pair to which the pressing unit is exerting the pressing force, and the laser radiation is irradiated onto a region in which the contact regions are pressed against each other.

Abstract: An electric machine for a drivetrain of a motor vehicle may comprise: a rotor with a rotor laminated core; a stator with winding heads on opposite end faces; and a housing with a a cooling liquid reservoir. The rotor core comprises multiple stacked laminations each with an aperture connecting the end faces to one another. The apertures of adjacent laminations are offset in a circumferential direction so: a first helical cooling channel connects an inner region of the core to a first end face; a second helical cooling channel connects the inner region of the core to a second end face; and the first cooling channel and the second cooling channel are oriented oppositely with respect to one another and are connected via a passage within the rotor laminated core to a feed line conducting the cooling liquid within the rotor shaft.

Abstract: The disclosure relates to an electric machine having a stator, a rotor and an inverter arranged in an inverter housing. The rotor is rotatably mounted about a rotational axis with its rotor axis in a first end shield and in a second end shield. The second end shield is arranged in or on the inverter housing. At least one suction opening and at least one blowing opening are arranged on the radial periphery of the second end shield. At least two cooling fins are provided on the second end shield, a baffle is arranged between the cooling fins of the second end shield and the stator and the rotor which is arranged in the stator, such that a cooling medium flowing radially through the at least one suction opening is guided to the at least one blowing opening.

Abstract: A cooling system for an electric machine is disclosed. The cooling system includes at least one bearing bracket and at least one coolant distributor plate. The bearing bracket and the coolant distributor plate are designed to jointly form a cooling channel. The cooling channel includes multiple horizontal cooling channel sections which run parallel to an axis of rotation of the electric machine, multiple vertical cooling channel sections which run perpendicular to the axis of rotation of the electric machine, and multiple radial cooling channel sections which run around the axis of rotation of the electric machine. The three different cooling channel sections adjoin one another such that the cooling channel has a three-dimensional meandering profile at least in regions.

Abstract: The disclosure relates to a rotor for a permanently excited electric machine. The rotor includes a holding pocket which is formed by a cutout of the rotor and which is designed to receive a permanent magnet. At least one flexible limb projects into the holding pocket of the rotor, and is designed to form an interference fit together with a circumferential boundary of the holding pocket and the permanent magnet arranged between the at least one flexible limb and the circumferential boundary.

Abstract: An air-cooled electric motor having a parallel circuit of two fan wheels is discloses. The electric motor includes a belt tensioner attached on a fixed bearing side of the electric motor, an inverter housing arranged on a floating bearing side of the electric motor, and a fan system having a first fan wheel on the floating bearing side and a second fan wheel on the fixed bearing side. The first fan wheel suctions a cooling air volume flow from the environment radially inward and blows a first part of the suctioned air volume flow radially outward via a stator winding head on the floating bearing side, from the electric motor back into the environment. The second fan wheel suctions a second part of the air volume flow and blows it radially outward via a stator winding head on the fixed bearing side, from the electric motor back into the environment.

Abstract: The invention discloses an unenclosed electrical machine (EM), comprising: —a stator (ST), within which there is a cavity (HR); —an insulating sheath (IU), which seals off an outer circumferential surface (UF) and at least one side face (SF1) of the stator (ST) in a media-tight manner; —at least one end shield (LS1, LS2), which is arranged on the side face (SF1) of the stator (ST) and delimits the cavity (HR) on one side; —at least one sealing arrangement (DA), which is arranged between the insulating sheath (IU) and the at least one end shield (LS1, LS2), and seals off the cavity (HR) from the surroundings in a media-tight manner.

Abstract: The disclosure relates to an electric machine having a stator, a rotor and an inverter arranged in an inverter housing. The rotor is rotatably mounted about a rotational axis with its rotor axis in a first end shield and in a second end shield. The second end shield is arranged in or on the inverter housing. At least one suction opening and at least one blowing opening are arranged on the radial periphery of the second end shield. At least two cooling fins are provided on the second end shield, a baffle is arranged between the cooling fins of the second end shield and the stator and the rotor which is arranged in the stator, such that a cooling medium flowing radially through the at least one suction opening is guided to the at least one blowing opening.

Abstract: A method for welding a plurality of wire segment pairs is disclosed. Each wire segment pair has two adjacent wire segments, and each adjacent wire segment has a contact region where the wire segment is to be welded to the respective other wire segment. The wire segment pairs are successively guided between two elements of a pressing unit, and at a weld moment in which at least one of the wire segment pairs is located between the two elements. The pressing unit exerts a pressing force onto the wire segment pair such that the contact regions of the wire segments are pressed against each other. At each weld moment, laser radiation is irradiated onto the wire segment pair to which the pressing unit is exerting the pressing force, and the laser radiation is irradiated onto a region in which the contact regions are pressed against each other.