Stator and electrical machine

A method of making a stator of an electric machine, said method comprising:

• a) making individual generally strip-shaped laminas (15) for the stator;
• b) stacking the individual laminas (15) to form a stator core (13) with a yoke having a yoke height, so that one side of the stator core is provided with grooves (18) extending through the core;
• c) producing a subassembly by inserting a stator winding (17) into the grooves (18) of the stator core (13) formed in step b);
• d) bending the subassembly in a circular fashion to form a cylindrical cavity, so that the grooves (18) end in the cavity;
• and
• e) in order to keep the subassembly in a configuration with the cylindrical cavity, connecting at least two ends (23) of the stator core (13) to each other by means of a welding seam (20);
• wherein a welding seam depth (TS) of the welding seam (20) is a function of the yoke height (Hyoke) and a tolerance value (ΔTS) and is given by the following formula (I):
• TS=0.5 mm*(Hyoke/mm−1)±ΔTS (I).

An electric machine comprising a stator (10) made by a method, which comprises:

• a) making individual generally strip-shaped laminas (15) for the stator;
• b) stacking the individual laminas (15) to form a stator core (13) with a yoke having a yoke height, so that one side of the stator core is provided with grooves (18) extending through the core;
• c) producing a subassembly by inserting a stator winding (17) into the grooves (18) of the stator core (13) formed in step b);
• d) bending the subassembly in a circular fashion to produce a cylindrical cavity, so that the grooves (18) end in the cavity;
• and
• e) in order to keep the subassembly in a configuration with the cylindrical cavity, connecting at least two ends (23) of the stator core (13) to each other by means of a welding seam (20);
• wherein a welding seam depth (TS) of the welding seam (20) is a function of the yoke height (Hyoke) and a tolerance value (ΔTS) and is given by the following formula (I):
• TS=0.5 mm*(Hyoke/mm−1)±ΔTS (I).