Method for producing a stator for an electric machine

A method for producing a stator for an electric machine, the method comprising:

• (a) providing a stator, which comprises an annular stator body, from which multiple stator teeth for receiving stator windings that are arranged spaced from one another along a circumferential direction of the stator body protrude radially to the inside, wherein between two stator teeth adjacent in the circumferential direction, an intermediate space is formed in each case;
• (b) at least partial overmolding at least two stator teeth that are adjacent in the circumferential direction with a first plastic mass;
• (c) arranging at least one stator winding on at least one stator tooth;
• (d) fixing the at least one stator winding on the at least one stator tooth through at least partial overmolding of this stator winding with a second plastic mass;
• following the overmolding with the first plastic mass according to step (b) and prior to the fixing of the at least one stator winding according to step (d), introducing a first mask into the intermediate space between the two stator teeth, such that the volume of the intermediate space filled out by the first mask for forming a coolant passage remains free of the second plastic mass during the overmolding according to step (d);
• and
• following the overmolding with the first plastic mass according to step (b) and prior to the fixing of the at least one stator winding according to step (d), introducing a second mask in a radially inner end portion of the intermediate space, such that the volume of the intermediate space filled out by the second mask, remains free of the second plastic mass during the overmolding according to step (d) for forming an additional coolant passage.

A method for producing a stator for an electric machine, the method comprising:

• (a) providing a stator, which comprises an annular stator body, from which multiple stator teeth for receiving stator windings that are arranged spaced from one another along a circumferential direction of the stator body protrude radially to the inside, wherein between two stator teeth adjacent in the circumferential direction, an intermediate space is formed in each case;
• (b) at least partial overmolding at least two stator teeth that are adjacent in the circumferential direction with a first plastic mass;
• (c) arranging at least one stator winding on at least one stator tooth;
• (d) fixing the at least one stator winding on the at least one stator tooth through at least partial overmolding of this stator winding with a second plastic mass;
• following the overmolding with the first plastic mass according to step (b) and prior to the fixing of the at least one stator winding according to step (d), introducing a first mask into the intermediate space between the two stator teeth, such that the volume of the intermediate space filled out by the first mask for forming a coolant passage remains free of the second plastic mass during the overmolding according to step (d);
• following the overmolding with the first plastic mass according to step (b) and prior to the fixing of the at least one stator winding according to step (d), introducing a second mask in a radially inner end portion of the intermediate space, such that the volume of the intermediate space filled out by the second mask, remains free of the second plastic mass during the overmolding according to step (d) for forming an additional coolant cooling passage;
• (f) overmolding of the second plastic mass bounding the hollow space or the coolant passage and/or of the stator winding fixed to the stator tooth with the second plastic mass and/or of the surface portion of the stator body covered by the first mask prior to the removal of the same with a third plastic mass;
• and
• carrying out the overmolding with the third plastic mass after the removing of the first mask.