Internal rotor with rotor plate having sprung web-shaped clamping element to clamp the magnet and two recesses
An internal rotor for an electric motor has a laminated rotor core with a multiplicity of rotor plates, and multiple pockets in each of which pocket a rotor magnet is at least partially arranged. The rotor plates have first recesses for forming the pockets and at least a first rotor plate which has at least a second recess associated with a first recess. A sprung web-shaped clamping element is formed between the second recess and the associated first recess, and tensioned toward the second recess by the associated rotor magnet to apply a force to the associated rotor magnet toward the first recess in order to hold the associated rotor magnet in the pocket. A rotor plate holds a rotor magnet in a pocket of a laminated rotor core.
1. An internal rotor ( 150 ) for an electric motor ( 100 ),
which internal rotor ( 150 ) has a laminated rotor core ( 200 ; 600 ) with a multiplicity of rotor plates ( 310 ), which laminated rotor core ( 200 ; 600 ) has multiple pockets ( 210 ) in each of which a rotor magnet ( 221 ; 621 ) is at least partially arranged,
which rotor plates have first recesses ( 211 ; 611 ) for forming the pockets ( 210 ),
which rotor plates ( 310 ) have at least a first rotor plate ( 311 ),
which first rotor plate ( 311 ) has at least a second recess ( 230 ; 231 - 236 ; 631 ), which second recess ( 230 ; 231 - 236 ; 631 ) is associated with a first recess ( 211 - 216 ; 611 ), wherein the ratio of the angular extent (phi_R 2 ) of the second recess ( 230 ; 231 - 236 ; 631 ) to the angular extent (phi_RM) of the associated rotor magnet ( 221 ; 621 ) is in the range of 0.4 to 0.8,
wherein, between the second recess ( 230 ; 231 - 236 ; 631 ) and the associated first recess ( 211 - 216 ; 611 ), a sprung web-shaped clamping element ( 291 ; 691 ) is formed, which clamping element ( 291 ; 691 ) is tensioned toward the second recess ( 231 - 236 ; 631 ) by the associated rotor magnet ( 221 , 621 ), and which clamping element ( 291 ; 691 ) as a result applies a force to the associated rotor magnet ( 221 ; 621 ) toward the first recess ( 211 - 216 ; 611 ) in order to hold the associated rotor magnet ( 221 ; 621 ) in the pocket ( 210 ),
wherein the first rotor plate ( 311 ) has a first contour,
wherein the rotor plates ( 310 ) have at least a second rotor plate ( 312 ), which second rotor plate ( 312 ) has a second contour, wherein the second contour covers the first contour in the area of the second recess ( 231 ) at least in sections, and
wherein the second rotor plate ( 312 ) at least partially covers the clamping element ( 291 ; 691 ), in order to limit in this manner, in an arrangement of the second rotor plate ( 312 ) on the first rotor plate ( 311 ), a movement of the clamping element ( 291 ; 691 ) of the first rotor plate ( 311 ) in an axial direction toward the second rotor plate ( 312 ), while however allowing a movement of the clamping element ( 291 ; 691 ) in a direction perpendicular to the axial direction.
2. The internal rotor ( 150 ) according to claim 1 , wherein the ratio of the angular extent (phi_R 2 ) of the second recess ( 230 ; 231 - 236 ; 631 ) to the angular extent (phi_RM) of the associated rotor magnet ( 221 ; 621 ) is in the range of 0.5 to 0.8.
3. The internal rotor ( 150 ) according to claim 1 ,
wherein the second recess ( 231 - 236 ; 631 ) is adjacent to the first recess ( 211 - 216 ; 611 ) in radial direction.
4. The internal rotor ( 150 ) according to claim 1 ,
wherein the clamping element completely separates from one another the first recess ( 211 - 216 ; 611 ) and the second recess ( 231 - 236 ; 631 ) within the first rotor plate ( 311 ).
5. The internal rotor ( 150 ) according to claim 1 ,
wherein the second recess ( 231 ; 631 ) and the associated first recess ( 211 ; 611 ) have a common central axis.
6. The internal rotor ( 150 ) according to claim 1 ,
wherein the extent of the second recess ( 231 ; 631 ) in tangential direction is at least 40% of the extent of the rotor magnet ( 221 ; 621 ) in tangential direction.
7. The internal rotor ( 150 ) according to claim 1 ,
wherein the rotor magnet ( 221 ; 621 ) has a first side facing the clamping element ( 291 ; 691 ), and
wherein the clamping element ( 291 ; 691 ) in the tensioned state has a shape which is not exactly complementary to the shape of the first side, in order to hereby clamp the rotor magnet ( 221 ; 621 ) in the first recess ( 211 ; 611 ) on the first side just in a partial area.
8. The internal rotor ( 150 ) according to claim 1 , wherein the clamping element ( 291 ; 691 ) extends from the first recess ( 211 ; 611 ) to the second recess ( 231 ; 631 ).
9. The internal rotor ( 150 ) according to claim 1 , wherein the rotor core ( 200 ) has a passage opening ( 240 ) for receiving a shaft ( 40 ), and wherein the second recess ( 231 ) is arranged in the area between the passage opening ( 240 ) and the associated first recess ( 211 ).
10. The internal rotor ( 150 ) according to claim 1 , wherein the clamping element ( 291 ; 691 ) has a local convexity ( 292 ; 692 ) in radial direction.
11. The internal rotor ( 150 ) according to claim 1 , wherein the first rotor plate ( 312 ) has a second rotor plate ( 312 ) on one side or on both sides.
12. The internal rotor ( 150 ) according to claim 1 , wherein, on one axial end or the two axial ends of the laminated rotor core ( 200 ; 600 ), at least five second rotor plates ( 312 ) are provided before a first rotor plate ( 311 ) is provided.
13. The internal rotor ( 150 ) according to claim 1 , wherein the laminated rotor core ( 200 ; 600 ) has a number n of first rotor plates ( 311 ) chosen from 2≤n≤6.
14. The internal rotor ( 150 ) according to claim 1 , wherein the first rotor plate ( 312 ) has for each first recess ( 211 - 216 ) at least a clamping element ( 291 ; 691 ).
15. An electric motor ( 100 ) with an external stator ( 28 ) and an internal rotor ( 150 ) according to claim 1 .
16. The internal rotor ( 150 ) according to claim 1 ,
wherein the extent of the second recess ( 231 ; 631 ) in tangential direction is at least 45% of the extent of the rotor magnet ( 221 ; 621 ) in tangential direction.
17. The internal rotor ( 150 ) according to claim 1 , wherein the clamping element ( 291 ; 691 ) has a first end section ( 291 L) and a second end section ( 291 R), which are each connected to a remaining area of the rotor plate ( 311 ), wherein a central section ( 291 M) is provided between the first end section ( 291 L) and the second end section ( 291 R).
18. The internal rotor ( 150 ) according to claim 17 , wherein, on the clamping element ( 291 ; 691 ), due to the tensioning toward the second recess ( 231 - 236 ; 631 ), in the central section ( 291 M) of the clamping element ( 291 ; 691 ), at least in sections on the side facing the rotor magnet ( 221 ), a compressive stress exists, and, on the side facing away from the rotor magnet ( 221 ), a tensile stress exists.
19. The internal rotor ( 150 ) according to claim 17 , wherein, on the clamping element ( 291 ; 691 ), due to the tensioning toward the second recess ( 231 - 236 ; 631 ), in the first end section ( 291 L) and in the second end section ( 291 R) of the clamping element ( 291 ; 691 ), a tensile stress exists on the side facing the rotor magnet ( 221 ), and a compressive stress exists on the side facing away from the rotor magnet ( 221 ).
20. The internal rotor ( 150 ) according to claim 17 , wherein, on the side facing the first recess ( 211 - 216 ; 611 ), the central section ( 291 M) is designed with convex curvature at least in sections.
21. The internal rotor ( 150 ) according to claim 17 ,
wherein, on the side facing the second recess ( 231 - 236 ; 631 ), the central section ( 291 M) is designed with concave curvature at least in sections.
22. The internal rotor ( 150 ) according to claim 17 ,
wherein the central section ( 291 M) has a protrusion ( 692 ) which protrudes into the first recess ( 211 - 216 ; 611 ).
23. An internal rotor ( 150 ) for an electric motor ( 100 ),
which internal rotor ( 150 ) has a laminated rotor core ( 200 ; 600 ) with a multiplicity of rotor plates ( 310 ), which laminated rotor core ( 200 ; 600 ) has multiple pockets ( 210 ) in each of which a rotor magnet ( 221 ; 621 ) is at least partially arranged,
which rotor plates have first recesses ( 211 ; 611 ) for forming the pockets ( 210 ),
which rotor plates ( 310 ) have at least a first rotor plate ( 311 ),
which first rotor plate ( 311 ) has at least a second recess ( 230 ; 231 - 236 ; 631 ), which second recess ( 230 ; 231 - 236 ; 631 ) is associated with a first recess ( 211 - 216 ; 611 ), wherein the ratio of the angular extent (phi_R 2 ) of the second recess ( 230 ; 231 - 236 ; 631 ) to the angular extent (phi_RM) of the associated rotor magnet ( 221 ; 621 ) is in the range of 0.4 to 0.8,
wherein, between the second recess ( 230 ; 231 - 236 ; 631 ) and the associated first recess ( 211 - 216 ; 611 ), a sprung web-shaped clamping element ( 291 ; 691 ) is formed, which clamping element ( 291 ; 691 ) is tensioned toward the second recess ( 231 - 236 ; 631 ) by the associated rotor magnet ( 221 , 621 ), and which clamping element ( 291 ; 691 ) as a result applies a force to the associated rotor magnet ( 221 ; 621 ) toward the first recess ( 211 - 216 ; 611 ) in order to hold the associated rotor magnet ( 221 ; 621 ) in the pocket ( 210 ), and
wherein the first rotor plate ( 311 ) has a first contour,
wherein the rotor plates ( 310 ) have at least a second rotor plate ( 312 ), which second rotor plate ( 312 ) has a second contour, wherein the second contour covers the first contour in the area of the second recess ( 231 ) at least in sections, and
wherein the rotor magnet ( 221 ; 621 ) has a first side facing the clamping element ( 291 ; 691 ),
in which internal rotor ( 150 ) the clamping element ( 291 ; 691 ) of the first rotor plate partially covers the contour of the second rotor plate ( 312 ), in order to exert in this manner a higher pressure on the first side of the rotor magnet ( 221 ; 621 ) by the clamping element ( 291 ; 691 ) of the first rotor plate ( 311 ) than by the second rotor plate ( 312 ).
24. An internal rotor ( 150 ) for an electric motor ( 100 ),
which internal rotor ( 150 ) has a laminated rotor core ( 200 ; 600 ) with a multiplicity of rotor plates ( 310 ), which laminated rotor core ( 200 ; 600 ) has multiple pockets ( 210 ) in each of which a rotor magnet ( 221 ; 621 ) is at least partially arranged,
which rotor plates have first recesses ( 211 ; 611 ) for forming the pockets ( 210 ),
which rotor plates ( 310 ) have at least a first rotor plate ( 311 ),
which first rotor plate ( 311 ) has at least a second recess ( 230 ; 231 - 236 ; 631 ), which second recess ( 230 ; 231 - 236 ; 631 ) is associated with a first recess ( 211 - 216 ; 611 ), wherein the ratio of the angular extent (phi_R 2 ) of the second recess ( 230 ; 231 - 236 ; 631 ) to the angular extent (phi_RM) of the associated rotor magnet ( 221 ; 621 ) is in the range of 0.4 to 0.8,
wherein, between the second recess ( 230 ; 231 - 236 ; 631 ) and the associated first recess ( 211 - 216 ; 611 ), a sprung web-shaped clamping element ( 291 ; 691 ) is formed, which clamping element ( 291 ; 691 ) is tensioned toward the second recess ( 231 - 236 ; 631 ) by the associated rotor magnet ( 221 , 621 ), and which clamping element ( 291 ; 691 ) as a result applies a force to the associated rotor magnet ( 221 ; 621 ) toward the first recess ( 211 - 216 ; 611 ) in order to hold the associated rotor magnet ( 221 ; 621 ) in the pocket ( 210 ), and
wherein the rotor magnet ( 221 ), before the introduction into the pocket ( 210 ), has in radial direction a maximum oversize O 1 relative to the pocket, wherein the following applies:
the ratio of B 1 to O 1 is in the range of 1.5 to 4.0.