Permanently-excited dynamoelectric machine
A permanently-excited dynamoelectric machine includes a stator and a rotor supported for rotation about an axis. The stator has a winding system, which is embedded in grooves of a material forming a magnetic return path and interacts electromagnetically with permanent magnets of the rotor via an air gap between the stator and the rotor. The permanent magnets are disposed on the rotor, with each individual permanent magnet, on a side facing towards the air gap, having a North and South pole. The rotor, viewed in the circumferential direction, has a pole coverage by the permanent magnets of 100%, i.e. that the permanent magnets viewed in the circumferential direction, are arranged substantially without gaps.
1. A permanently-excited dynamoelectric machine, comprising:
a rotor supported for rotation about an axis and having a circumference;
permanent magnets magnetized with a Dysprosium-reduced material disposed on the rotor about the circumference at a pole coverage of 100% in the absence of a gap between adjacent one of the permanent magnets;
a stator having a winding system embedded in grooves of a material forming a magnetic return path and interacting electromagnetically with the permanent magnets of the rotor via an air gap between the stator and the rotor; and
a shaft, said rotor having a low-inertia structure in a torsion-proof manner with the shaft to hold, fix and position the permanent magnets,
wherein the permanent magnets have a lense-shaped configuration elongated in a circumferential direction with a radially outwardly convex outer surface and a radially inwardly convex inner surface and with tips formed between circumferential ends of said radially outwardly and radially inwardly convex outer and inner surfaces, and
wherein the lense-shaped permanent magnets are arranged so that each of two of circumferentially neighboring lense-shaped magnets contact each other with their tips which form poles of the permanent magnets.
2. The permanently-excited dynamoelectric machine of claim 1 , wherein the rotor has a laminated configuration, with the permanent magnets being disposed on its surface.
3. The permanently-excited dynamoelectric machine of claim 1 , wherein the permanent magnets have a lens-shaped, trapezoidal or shell-shaped configuration, such that, independently of a number of poles of the rotor, a section of the permanent magnets facing away from the air gap essentially follows a magnetic preferred direction.
4. The permanently-excited dynamoelectric machine of claim 1 , wherein the rotor is embodied as a high-pole rotor having more than six poles.
5. The permanently-excited dynamoelectric machine of claim 1 , wherein the tips of each two of the circumferentially neighboring permanent magnets form poles selected from the group consisting of same poles and different poles.
6. The permanently-excited dynamoelectric machine of claim 1 , wherein
the rotor has a carrier structure which receives and holds said lense-shaped magnets and is configured as a structure selected from the group consisting of a star-shaped carrier structure and a spike-like carrier structure.
7. A wind power plant, comprising:
a generator including a dynamoelectric machine comprising a rotor supported for rotation about an axis and having a circumference,
permanent magnets magnetized with a Dysprosium-reduced material disposed on the rotor about the circumference at a pole coverage of 100% in the absence of a gap between adjacent one of the permanent magnets,
a stator having a winding system embedded in grooves of a material forming a magnetic return path and interacting electromagnetically with the permanent magnets of the rotor via an air gap between the stator and the rotor, and
a shaft, said rotor having a low-inertia structure in a torsion-proof manner with the shaft to hold, fix and position the permanent magnets;
wherein the permanent magnets have a lense-shaped configuration elongated in a circumferential direction with a radially outwardly convex outer surface and a radially inwardly convex inner surface and with tips formed between circumferential ends of said radially outwardly and radially inwardly convex outer and inner surfaces, and
wherein the lense-shaped permanent magnets are arranged so that each of two of circumferentially neighboring lense-shaped magnets contact each other with their tips which form poles of the permanent magnets.
8. The wind power plant of claim 7 , wherein the generator is embodied as an external armature or internal armature and/or is able to be driven as a direct drive or via a transmission.
9. The wind power plant of claim 7 , wherein the rotor has a laminated configuration, with the permanent magnets being disposed on its surface.
10. The wind power plant of claim 7 , wherein the permanent magnets have a lens-shaped, trapezoidal or shell-shaped configuration, such that, independently of a number of poles of the rotor, a section of the permanent magnets facing away from the air gap essentially follows a magnetic preferred direction.
11. The wind power plant of claim 7 , wherein the rotor is embodied as a high-pole rotor having more than six poles.
12. The permanently-excited dynamoelectric machine of claim 7 , wherein the tips of each two of the circumferentially neighboring permanent magnets form poles selected from the group consisting of same poles and different poles.
13. The permanently-excited dynamoelectric machine of claim 7 , wherein
the rotor has a carrier structure which receives and holds said lense-shaped magnets and is configured as a structure selected from the group consisting of a star-shaped carrier structure and a spike-like carrier structure.
14. A drive for an electrically-driven aircraft or an electrically-driven motor vehicle such as an E-car or an electric traction vehicle, comprising:
a dynamoelectric machine including a rotor supported for rotation about an axis and having a circumference,
permanent magnets magnetized with a Dysprosium-reduced material disposed on the rotor about the circumference at a pole coverage of 100% in the absence of a gap between adjacent one of the permanent magnets,
a stator having a winding system embedded in grooves of a material forming a magnetic return path and interacting electromagnetically with the permanent magnets of the rotor via an air gap between the stator and the rotor, and
a low-inertia structure in a torsion-proof manner with the shaft to hold, fix and position the permanent magnets,
wherein the permanent magnets have a lense-shaped configuration elongated in a circumferential direction with a radially outwardly convex outer surface and a radially inwardly convex inner surface and with tips formed between circumferential ends of said radially outwardly and radially inwardly convex outer and inner surfaces, and
wherein the lense-shaped permanent magnets are arranged so that each of two of circumferentially neighboring lease-shaped magnets contact each other with their tips which form poles of the permanent magnets.
15. The drive of claim 14 , wherein the rotor has a laminated configuration, with the permanent magnets being disposed on its surface.
16. The drive of claim 14 , wherein the permanent magnets have a lens-shaped, trapezoidal or shell-shaped configuration, such that, independently of a number of poles of the rotor, a section of the permanent magnets facing away from the air gap essentially follows a magnetic preferred direction.
17. The drive of claim 14 , wherein the rotor is embodied as a high-pole rotor having more than six poles.
18. The permanently-excited dynamoelectric machine of claim 14 , wherein the tips of each two of the circumferentially neighboring permanent magnets form poles selected from the group consisting of same poles and different poles.
19. The permanently-excited dynamoelectric machine of claim 14 , wherein
the rotor has a carrier structure which receives and holds said lense-shaped magnets and is configured as a structure selected from the group consisting of a star-shaped carrier structure and a spike-like carrier structure.