Housingless motor and method for producing same

A method for producing a stator of a dynamo-electric rotating machine, in particular a housingless dynamo-electric machine, the method comprising:

• producing a magnetically conductive hollow-cylindrical body with slots pointing toward an inner shell face of the hollow-cylindrical body, and with surface-enlarging structures formed on an outer shell face of the hollow-cylindrical body, or with the outer shell face being smooth;
• positioning a winding system in the slots such that winding heads are capable of being formed on end sides of the hollow-cylindrical body;
• pressing toroidal bearing shields, which are open on one side, or adapter bearing shields, on the end sides of the hollow-cylindrical body to form the winding heads, wherein the bearing shields terminate at least in a radially outer region of the hollow-cylindrical body by way of the end sides of the hollow-cylindrical body in such a manner that the bearing shields bear each on the radially outer edge of a corresponding one of the end sides of the hollow-cylindrical body;
• and
• introducing liquid impregnation resin into a receptacle space of a winding head while holding the dynamo-electric rotating machine on a shaft of an inserted rotor and causing a distribution of the impregnation resin in the slot and a DE (drive end)-proximal bearing shield and a NDE (non-drive end)-proximal bearing shield as an axis of the rotor is tilted and/or subjected to rotating and/or tumbling movements;
• wherein, as a result of a predefined rotating speed, a flow of the impregnation resin radially inward into an air gap is avoided due to the effect of a centrifugal force, but sufficient wetting of the winding system is nevertheless achieved in such a way that the inner shell face remains free from the impregnation resin.

A method for producing a stator of a dynamo-electric rotating machine, in particular a housingless dynamo-electric machine, the method comprising:

• producing a magnetically conductive hollow-cylindrical body with slots pointing toward an inner shell face of the hollow-cylindrical body, and with surface-enlarging structures formed on an outer shell face of the hollow-cylindrical body, or with the outer shell face being smooth;
• positioning a winding system in the slots such that winding heads are capable of being formed on end sides of the hollow-cylindrical body;
• pressing toroidal bearing shields, which are open on one side, or adapter bearing shields on the end sides of the hollow-cylindrical body to form the winding heads, wherein the bearing shields terminate at least in a radially outer region of the hollow-cylindrical body by way of the end sides of the hollow-cylindrical body in such a manner that the bearing shields bear each on the radially outer edge of a corresponding one of the end sides of the hollow-cylindrical body;
• and
• introducing liquid impregnation resin into a receptacle space of a winding head by nozzles which introduce the impregnation resin radially from inside on the winding head or winding heads, while holding the stator of the dynamo-electric rotating machine on an external circumference and causing a distribution of the impregnation resin in the slot and a DE (drive end)-proximal bearing shield and a NDE (non-drive end)-proximal bearing shield as an axis of the rotor is tilted and/or subjected to rotating and/or tumbling movements;
• wherein, as a result of a predefined rotating speed, a flow of the impregnation resin radially inward into an air gap is avoided due to the effect of a centrifugal force, but sufficient wetting of the winding system is nevertheless achieved in such a way that the inner shell face remains free from the impregnation resin.

A dynamo-electric rotating machine, in particular a housingless dynamo-electric machine, the dynamo-electric rotating machine comprising:

• a stator comprising a magnetically conductive hollow-cylindrical body and slots pointing toward an inner shell face of the hollow-cylindrical body;
• a winding system disposed in the slots of the stator and forming winding heads on end sides of the hollow-cylindrical body,
• toroidal bearing shields which are open on one side and designed to surround at least one portion of the winding heads and thereby form the winding heads, said bearing shields being made of metal, plastics material, or ceramic, and terminating at least in a radially outer region of the hollow-cylindrical body with the end sides of the hollow-cylindrical body in such a manner that the bearing shields bear each on an radially outer edge of a corresponding one of the end sides of the hollow-cylindrical body;
• and
• impregnation resin distributed homogeneously in the winding system of the stator, the winding heads and windings in the slots, wherein the inner shell face is free from impregnation resin.