Stator arrangement for an electric machine and a method for manufacturing the stator arrangement
A stator arrangement for an electric machine having a stator body which has a back yoke ring and a number of stator teeth that project in a radial direction from the back yoke ring, wherein at least one additional ferromagnetic stator end lamination is mounted on at least one end face of the back yoke ring, the additional ferromagnetic stator end lamination being substantially flush with the back yoke ring, wherein projections are formed at the inner or outer circumference of the additional stator end lamination, the projections projecting axially from the outer end face of the stator end lamination and forming a guide for the winding wire.
1. A stator arrangement for an electric machine having a stator body ( 10 ) which has a back yoke ring ( 12 ) and a number of stator teeth ( 14 ) that project in a radial direction from the back yoke ring ( 12 ), wherein at least one additional ferromagnetic stator end lamination ( 16 ) is mounted on at least one end face of the back yoke ring ( 12 ), the additional ferromagnetic stator end lamination ( 16 ) being substantially flush with the back yoke ring ( 12 ), wherein projections ( 24 ) are formed at the inner or outer circumference of the additional stator end lamination ( 16 ), the projections ( 24 ) projecting axially from the outer end face of the stator end lamination and forming a guide for the winding wire,
wherein the additional stator end lamination ( 16 ) does not cover or does not fully cover the area of the stator teeth and carries a part of the magnetic flux through the stator when the machine is in operation so that the magnetic saturation of the stator body ( 10 ) in the area of the back yoke ring ( 12 ) is reduced.
2. A stator arrangement according to claim 1 , wherein the stator end lamination ( 16 ) has tongues that are bent in the way of hooks in the direction of the outer end face of the stator end lamination ( 16 ) and form the projections ( 24 ).
3. A stator arrangement according to claim 2 , wherein the tongues are bent at an angle of about 70° to 80°, more particularly about 75° towards the surface of the stator end lamination.
4. A stator arrangement according to claim 2 , wherein the stator teeth ( 14 ) of the stator body ( 10 ) are wound with winding wire ( 20 ) and that the winding wires between the stator teeth ( 14 ) are guided and held in position by the projections ( 24 ) of the stator end lamination ( 16 ).
5. A stator arrangement according to claim 1 , wherein a second to last stator lamination ( 50 ) is sandwiched between the stator body ( 10 ) and the stator end lamination ( 16 ), the second to last stator lamination ( 50 ) covering the stator teeth ( 14 ) and, at the pole shoes ( 48 ) having projections ( 46 ′) at the distal end of the stator teeth, the projections projecting axially from the associated end face.
6. A stator arrangement according to claim 5 , wherein the second to last stator lamination ( 50 ) is extended in the area of the pole shoes and is bent to be L-shaped for forming the projections ( 46 ′).
7. A stator arrangement according to claim 1 , wherein the stator end lamination ( 16 ′) covers the stator teeth ( 14 ) and, at the pole shoes ( 48 ) at the distal ends of the stator teeth comprises projections ( 46 ) which project axially from the associated end face.
8. A stator arrangement according to claim 7 , wherein the stator end lamination ( 16 ′) is extended at the pole shoes ( 48 ) and is bent to be L-shaped to form the projections ( 46 ).
9. A stator arrangement according to claim 8 , wherein the pole shoe extensions are bent at an angle of about 90° towards the surface of the stator end lamination.