Patent ID: 12244176

DETAILED DESCRIPTION

FIG.1shows a stator according to the invention.

The stator1of an electric machine comprises at least one laminated stator core3which is formed of a stack of stator laminations4and comprises a stator axis2. The stator1or the laminated stator core3comprises a plurality of stator teeth5and a plurality of stator slots6disposed between the stator teeth5. The stator slots6are respectively formed between two stator teeth5.

Each of the stator laminations4comprises a plurality of lamination teeth7and a lamination yoke8which connects said lamination teeth7to one another. The stator teeth5of the laminated stator core3are respectively formed by stacked lamination teeth7of the stator laminations4.

FIG.2shows a partial view of the stator ofFIG.1in an unfinished state, in which the stator laminations4are still lying loosely on top of one another and all lamination teeth7of each individual stator tooth5of the laminated stator core3are disposed in alignment with one another, as can be seen in the sectional view according toFIG.3.

FIG.3shows a sectional view according to a section through the unfinished laminated stator core3along the section line inFIG.2.

As before, the stator1comprises electrical conductor elements10that extend through the stator slots6of the laminated stator core3and are provided to form an electrical winding, for example a plug-in winding. The conductor elements10respectively have a quadrangular, in particular rectangular, cross-section, for example, and are implemented, for example, as so-called hairpins or as so-called I-pins.

A slot insulation11, for example, for example a slot insulation paper, is provided in the stator slots6for electrical insulation of the conductor elements10against the laminated stator core3.

The stator slots6provided with the conductor elements10comprise cavities9which, in the finished state of the stator1, can be filled at least partially with an impregnating agent16.

FIG.4shows a partial view of a first design example of stator according to the invention ofFIG.1.

FIG.5shows a sectional view of a section through the laminated stator core along the section line V-V inFIG.4, wherein the sectional view additionally shows the slot insulation11and one of the conductor elements10.

According to the invention, it is provided that at least one stator lamination4is provided in the laminated stator core3which is twisted in peripheral direction with respect to the stator axis2relative to others of the stator laminations4of the laminated stator core3such that, in each stator slot6of the laminated stator core3, it projects into the respective stator slot6with a lamination tooth portion12of one of the lamination teeth7.

In each stator slot6, the respective twisted stator lamination4projects into the respective stator slot6with the lamination tooth portion12on one of the two stator teeth5which delimit the respective stator slot6and a recess13having a negative contour which corresponds to the projecting lamination tooth portion12is formed on the other stator tooth5which delimits the respective stator slot6.

According to the design examples inFIG.4toFIG.7, a plurality of stator laminations4in the laminated stator core3are twisted in peripheral direction with respect to the stator axis2relative to others of the stator laminations4of the laminated stator core3, for example in the same twist direction.

According to the first design example ofFIG.4andFIG.5, the plurality of twisted stator laminations4in the laminated stator core3are disposed in a plurality of spaced-apart groups14of abutting stator laminations4, wherein one or more non-twisted stator laminations4are disposed in each case between two groups14of twisted stator laminations4.

FIG.6shows a partial view of a second design example of the stator according to the invention ofFIG.1.

FIG.7shows a sectional view of a section through the laminated stator core along the section line VII-VII inFIG.6, wherein the sectional view additionally shows the slot insulation11and one of the conductor elements10.

According to the second design example, the plurality of twisted stator laminations4in the laminated stator core3are disposed singly, wherein one or more non-twisted stator laminations4are disposed in each case between two twisted stator laminations4.

The plurality of twisted stator laminations4of the laminated stator core3are all twisted by the same angle of twist, for example. To obtain a skewed stator1, the plurality of twisted stator laminations4of the laminated stator core3can alternatively also respectively be twisted by a different angle of twist which increases in axial direction with respect to the stator axis2.

The following steps are carried out to produce the stator1according to the invention:a. stacking the stator laminations4to form a laminated stator core3,b. optionally inserting the slot insulation11into the stator slots6,c. inserting the conductor elements10into the respective stator slots6,d. fixing the stator laminations4of the laminated stator core3, for example joining, in particular welding the stator laminations4.

According to the invention, in terms of time after inserting the conductor elements10(Step c) and prior to fixing the stator laminations4(Step d), at least one stator lamination4, for example a plurality of stator laminations4, of the laminated stator core3is twisted in peripheral direction with respect to the stator axis2relative to others of the stator laminations4of the laminated stator core3such that, in each stator slot6of the laminated stator core3, it projects into the respective stator slot6with a lamination tooth portion12of one of the lamination teeth7.