Robert Bosch

Robert Bosch Gmbh

Patrick Priebe

Stefan Ossenkopp

Tobias Hein

Fabian Lange

Sven Kreutzkamp

The present invention relates to an electric machine () having a rotor () and a stator (), wherein the stator () and/or the rotor () has an electrical plug-in winding (), which comprises a plurality of rigid insulated electrical conductor elements (); the conductor elements () are arranged in grooves of the stator or of the rotor and their conductor ends () project out of the grooves; the conductor ends of the conductor elements () are each connected to conductor ends of other conductor elements () in order to form the electrical plug-in winding (); the conductor elements () have an electrically insulating insulation sheath (); characterized in that each conductor element () has a multiplicity of flexible fibres (), in particular of a conductor strand of flexible fibres (), made of carbon nanotubes or graphene and in that the insulation sheath () surrounds the multiplicity of fibres () like a hose and is designed in such a way that it gives the electrical conductor element () a rigid form.

Electric machine with flexible electrical conductors and shaping insulations

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 ().

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Hannover, Germany

Patrick Priebe