Abstract: An electric coupling arrangement for wireless signal transmission in the area of a cavity in an at least partially hollow machine part, including a hollow-cylindrical coupling element at a transmitter end which is fit into the cavity, is connected to a sensor located in or on the machine part and communicates with a pin-type coupling element at a receiver end via a transmission path inside the cavity, the pin-type coupling element at least partially projecting into the hollow-cylindrical portion, located in the cavity, of the coupling element at the transmitter end.

Abstract: An electrical drive device includes a machine unit having a machine housing and power electronics having an electronics housing. At least one of the two housings having at least one protrusion for defined positioning of the machine unit and the power electronics against each other during and/or after assembly. The respective other housing having a complementary cut-out in shape and size for receiving the protrusion, wherein material forming the protrusion and the cut-out is electrically conductive at least in some sections. The protrusion and the cut-out are electrically connected to an earth for the purpose of earthing the power electronics or the machine unit. The electrical drive device and the drive assembly equipped therewith allow the electromagnetic compatibility to be optimized in a cost-effective manner.