Electric machine having multiple rigid winding pieces in the form of hollow conductors and hydraulic connection part and seal with opposing surfaces

A method for the hydraulic connection of multiple rigid winding pieces of an electric machine which are in the form of hollow conductors to an annularly-shaped hydraulic connection part which has multiple connection openings for end portions of the winding pieces, comprising:

• arranging the end portions in a space;
• pouring a potting compound into the space, which potting compound flows around the end portions of the winding pieces and after some time hardens and forms a seal, the amount of potting compound being such that the end portions protrude from the seal;
• and
• placing the hydraulic connection part on the seal so that the protruding end portions dip into the connection openings of the hydraulic connection part, wherein the opposing surfaces face in an axial direction relative to the electric machine;
• pressing the opposing surfaces of the hydraulic connection part and of the seal against each other in order to seal the connections of the winding pieces to the hydraulic connection part, wherein the hydraulic connection part, in the opposing surface which is pressed against the seal, includes at least one annular groove which is in fluid communication with a number of winding pieces so that a coolant can be fed into the winding pieces or a coolant exiting the winding pieces can be collected in the at least one groove.