Transformer for externally excited synchronous machines: integration via bearings

A contactless energy transmission device for a rotor of an externally excited synchronous machine within a powertrain of a motor vehicle comprising:

• a housing part coupled in a rotationally rigid manner to a housing of the electric machine;
• an inductive transformer including a primary coil that is configured to be energized and a secondary coil that is arranged at a distance from the primary coil and is coupled to a winding of the rotor in an electrically conductive manner;
• and
• a roller bearing configured to rotatably mount a rotor shaft to the house part,
• wherein:
• the primary coil of the inductive transformer is positioned relative to the housing part in a rotationally rigid manner with respect thereto, and
• the roller bearing is arranged within the housing part such that the primary coil and the roller bearing are arranged coaxially,
• the secondary coil of the inductive transformer is arranged within a transformer housing, wherein the transformer housing is connected to the rotor in a rotationally fixed manner, and
• the primary winding and the secondary winding of the inductive transformer are arranged coaxially to one another within the transformer housing.

An electric machine comprising:

• a contactless energy transmission device comprising
• a housing part coupled in a rotationally rigid manner to a housing of the electric machine;
• an inductive transformer including a primary coil that is configured to be energized and a secondary coil that is arranged at a distance from the primary coil and is coupled to a winding of the rotor in an electrically conductive manner;
• and
• a roller bearing configured to rotatably mount a rotor shaft to the house part,
• wherein:
• the primary coil of the inductive transformer is positioned relative to the housing part in a rotationally rigid manner with respect to the housing part,
• the roller bearing is arranged within the housing part such that the primary coil and the roller bearing are arranged coaxially, and
• the secondary coil of the inductive transformer is arranged within a transformer housing, wherein the transformer housing is connected to the rotor in a rotationally fixed manner.