Permanently-excited dynamoelectric machine
AssigneeSiemens Aktiengesellschaft
InventorsReiner Seufert, Rolf Vollmer
Life of this patent
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Abstract
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.
Claims19
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.
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.
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.
Dependencies are inferred from the claim text.