Abstract: The invention concerns an armature for an electrical machine, in particular for an electrical starter, having a ferromagnetic main body in which at least one axially extending groove is arranged, in which said groove at least one electrical conductor is accommodated in the longitudinal groove length. It is provided that the armature (1) comprises at least one groove edge region element (8) formed and/or displaced by means of mechanical deformation of the main body (2) and acting upon the electrical conductor (4) for the purpose of defined positioning and/or fixation. The invention further concerns a method for producing an armature for an electrical machine.

Abstract: The invention concerns an armature for an electrical machine, in particular for an electrical starter, having a ferromagnetic main body in which at least one axially extending groove is arranged, in which said groove at least one electrical conductor is accommodated in the longitudinal groove length.

Abstract: The invention relates to a method for producing a commutator ring (10) for a commutator of an electrical machine, in which the laminas (12) of the commutator ring and fastening means (18) are formed out of a band material (27), and a selectable number of laminas (12) are then closed to form the commutator ring. The fastening means are produced with a special tool (35) in the form of dovetail grooves (22) by means of a so-called furrowing operation, which is done simultaneously from both face ends of the laminas (12).

Abstract: The invention relates to an ultrasound welding process and an ultrasound welding device for securing at least two wire ends located one above the other to contact regions of electrical parts, particularly to contact regions of laminations of commutators for rotating electrical machines or motors, having a sonotrode and having a device for introducing a contact pressure force. It is contemplated that all the wire ends (16, 18) to be secured to at least one contact region (14) are pressed against the contact region (14) by means of the contact pressure force (F), and at the same time the sonotrode (28) sets the lower wire end (16) into oscillation transversely to the contact pressure force (F).