Robert Boschgmbh

Em-motive Gmbh

Tobias Hein

Fabian Lange

Martin Ermer

Stefan Ossenkopp

Patrick Heuser

Andreas Herzberger

Johannes Riedl

Armin Elser

Andreas Heider

Patrick Priebe

Jeihad Zeadan

Steffen Jacob

Nikola Goranovic

Meiko Boley

Andreas Topf

Sarah Overmeier

Eike-Christian Kersten

The present invention relates to a stator of an electric machine with a stator body having a stator axis, which stator body comprises stator grooves in which there runs an electric plug-in winding which is formed from multiple conductor elements (), conductor elements () being provided which each run with conductor branches through one or two of the stator grooves and protrude from the stator grooves on at least one end face of the stator by means of conductor ends () and form a winding head, the conductor ends () of the conductor elements () being arranged in the corresponding winding head in a plurality of groups () distributed in the circumferential direction in relation to the stator axis, each group () comprising a plurality of conductor ends () arranged in a radial direction in relation to the stator axis, in particular aligned in the radial direction, characterized in that at least one, in particular a plurality, of the conductor ends () of each group (), as viewed in the radial direction, has raised structures () arranged on both sides, in such a way that the raised structures () on a first side () of the conductor end (), when the entire group () of conductor ends () is clamped between two clamping jaws, permit the conductor end () adjacent to the first side () and the conductor end () having structures () to be approached towards one another elastically or plastically by the clamping jaws in order for the relevant conductor ends () to be welded, and, on an opposite, second side () maintain a distance between the conductor end () adjacent to the second side () and the conductor end () having structures () in order to prevent a welding of the relevant conductor ends ().

Stator of an electrical machine

A stator of an electrical machine which has stator slots and conductor elements arranged in the stator slots, which conductor elements each have two conductor ends, is already known. A plurality of conductor ends, which are situated next to one another, of different conductor elements are in each case connected to one another by means of a weld connection, which is provided at the end sides of the conductor ends in question, without additional material. The conductor ends which are connected to one another in each case form a common rectangular conductor cross section which has a height H and a width B, wherein the height H corresponds to the height h of an individual cross section of the conductor ends, and the width B of the common conductor cross section is made up of the sum of the widths b of the individual cross sections of the conductor ends. The weld connection is in each case provided, as seen in the direction of the width B, between two non-melted edge sections of the outermost conductor ends. The weld cross section in the direction of the height H is comparatively low, this having effects on the long-tem mechanical strength of the weld connection and, during operation of the electrical machine, possibly causing temperature peaks at the weld connection as a result of a high current density. In the case of the stator according to the invention, the mechanical strength of the weld connection is increased. According to the invention, it is provided that the extent (L) of the weld connection () in the direction of the height (H) is greater, at least in sections, than the height (H) of the common conductor cross section (), and the surface of the weld connection () is consequently sunken in relation to the end sides () of the edge sections ().

The invention relates to a stator having a multi-phase wave winding made of hairpin conductor elements (). Each phase consists of two parallel or serially connected branches (). Each branch has a first () and a second () winding portion, which are connected to each other in series. The slot position of the two limbs () of each hairpin conductor element alternates by +&#x2212;1. The first winding portion () extends clockwise along the stator circumference; the second winding portion () extends counterclockwise and is connected to the first winding portion via a reverse-connector conductor element (). Both limbs of the reverse-connector conductor element () of the first winding branch () are located in the uppermost slot position; the limbs of the reverse-connector conductor element () of the second winding branch () are located in the lowermost slot position.

Stator for an electric machine

The invention relates to a stator () for an electric machine comprising a stator package (); a stator winding, which comprises a plurality of rod-shaped conductors (), which are inserted through the stator package () in an axial direction (A); wherein at least one first conductor () and an adjacent second conductor () of the plurality of conductors are electrically connected to each other on an end face () of the stator package () by means of a bridge () formed by laser welding; wherein the bridge () formed by laser welding extends at an angle to the axial direction (A) between the conductor ends () of the first conductor () and the second conductor ().

Laser welding method for stator

The invention relates to a method for connecting free flat wire ends () with a substantially rectangular cross section with four sides () of a stator of an electrical machine, comprising the steps at: stripping a first flat wire end (), sheathed with an insulation material, such that partial stripping is carried out at least on three sides () and such that the insulation material remains complete on a fourth side () of the first flat wire end (), and electrically connecting the stripped first flat wire end () on the completely stripped side () to a second flat wire end ().

Method for connecting flat wire ends and stator produced in such a way

Growing community of inventors

Gronau, Germany

Tobias Hein