Electrical machine with double excitation

Details Electrical machine with double excitation Electrical machine with double excitation

2000-02-23

2001-05-08

Ramirez, Nestor (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S049030, C310S156030, C310S261100, C310S263000, C310S268000

Reexamination Certificate

active

06229239

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to rotating electrical machines and more particularly to synchronous machines such as alternators for motor vehicles, traction engines or other machines.
Among the known machines, mention may be made of machines with excitation by windings mounted in the rotor, machines with excitation by magnets mounted in the rotor and machines with double excitation by both windings and magnets mounted in the rotor.
Such machines are especially described in Patent Application FR 97/03429 filed on Mar. 20, 1997 by the Applicant.
Although giving acceptable results, the known double-excitation machines are relatively bulky because of the presence of brushes and slip rings.
SUMMARY OF THE INVENTION
The invention therefore aims to create a rotating electrical machine of the double-excitation type which, whilst still having good performance characteristics, is less bulky than the known machines of the same type.
The subject of the invention is therefore a rotating electrical machine comprising, mounted on a shaft, a rotor whose magnetic circuit carries at least one excitation element and a stator whose magnetic circuit carries a stator winding, characterized in that the at least one said excitation element of the rotor comprises at least one annular magnet associated with at least two discs each provided with radial teeth uniformly distributed around their periphery and at least one annular piece provided with slots in each of which a tooth of at least one toothed disc is engaged without any contact, and in that the magnetic circuit of the stator includes an even number, at least equal to two, of annular magnetic-circuit elements, at least one stator excitation winding being arranged between at least two adjacent elements among the said magnetic-circuit elements.


REFERENCES:
patent: 3573519 (1971-04-01), Kumazawa
patent: 3849682 (1974-11-01), Binns
patent: 3904902 (1975-09-01), Inariba
patent: 4672247 (1987-06-01), Madsen et al.
patent: 4764697 (1988-08-01), Christiaens
patent: 5952758 (1999-09-01), Lucidarme et al.
patent: 41 15 887 (1991-05-01), None
patent: 2 189 909 (1974-01-01), None
R. Zmood et al., “High Performance Magnetic Bearings Suitable For Noise Cancellation In Permanent Magnet Motor Driven Pumps”,Proceedings of the Intersociety Energy Conversion Engineering Conference(IECEC), Boston, vol. 4 Aug. 4, 1991, pp. 198-202.

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