Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2000-10-11
2001-08-07
Ramirez, Nestor (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S152000, C310S156030, C310S168000
Reexamination Certificate
active
06271616
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates generally to rotating electrical machines and in particular to a synchronous rotating machine having a permanent magnet rotor.
The document “Comparison of different synchronous motor drives for flux weakening applications”, N. Bianchi et al., proceedings of the International Conference on Electrical Machines (ICEM), Istanbul, Turkey, September 1998, volume ⅔, pages 946 et seq, and in particular
FIG. 5
of the document and the associated description, discloses a machine whose rotor is separated into two coaxial parts disposed end-to-end in the axial direction.
A first part of the rotor constitutes an excitation magnet rotor and the other part constitutes a variable reluctance rotor.
Although a machine of the above kind has beneficial properties, in particular in terms of flux weakening if the machine has to operate under reduced load conditions, a major drawback is that it is necessary to provide two types of yoke for rotor structure, i.e. a yoke for the permanent magnet part of the rotor and a yoke for the variable reluctance part of the rotor.
A first object of the present invention is to alleviate this drawback and to provide a rotor operating in accordance with the same principle using a single yoke.
To be more precise, the present invention proposes to combine the two rotor parts into a single rotor whose yoke can therefore be made with a single lamination shape.
BRIEF SUMMARY OF THE INVENTION
The present invention therefore proposes a rotary electrical machine, in particular an alternator or combined alternator/starter motor for automobile vehicles, comprising a stator equipped with stator windings and a rotor mounted to rotate inside the stator, the rotor having a permanent magnet rotor part and a variable reluctance rotor part, characterized in that the rotor is substantially uniform throughout its axial length and has in its tangential direction a distribution of permanent magnet pole parts each defining two poles whose polarity is imposed by magnet(s) and variable reluctance pole parts each defining two poles whose polarity is not imposed.
Preferred, but non-limiting, features of the rotating machine according to the present invention are as follows:
the machine has the same number of permanent magnet pole parts and variable reluctance pole parts, disposed alternately.
the machine has different numbers of permanent magnet pole parts and variable reluctance pole parts, with at least one succession of at least two pole parts of the same type.
each permanent magnet pole part comprises two magnets whose flux is essentially radial and which are disposed in the vicinity of the periphery of the rotor.
the magnets are on the surface.
the magnets are buried.
the poles of the rotor are defined by interleaved pole claws of two rotor parts.
each permanent magnet pole part comprises a magnet whose flux is essentially tangential disposed in a notch formed between two regions of said pole part which define its poles.
the permanent magnet pole parts and the variable reluctance pole parts are portions of a single yoke.
each variable reluctance pole part has arrangements for channeling magnetic flux between its two poles.
each variable reluctance pole part has at least one buried auxiliary magnet for channeling magnetic flux.
REFERENCES:
patent: 4482831 (1984-11-01), Notaras et al.
patent: 4486678 (1984-12-01), Olson
patent: 5304882 (1994-04-01), Lipo et al.
patent: 5818140 (1998-10-01), Vagati
patent: 6072256 (2000-06-01), Shon et al.
patent: 6121706 (2000-09-01), Nashiki et al.
Binns et al: “Use of canned rotors in high-filed permanent magnet machines”, IEE Proceedings-B, vol. 139, No. 5, Sep. 1992.
Xu et al: “A New Design Concept of Permanent Magnet Machine for Flux Weakening Operation”, IEEE Industry Applications Conference, vol. I, Oct. 3-8, 1993.
International Search Report dated Aug. 18, 2000.
Lam Thanh
Morgan & Finnegan , LLP
Ramirez Nestor
Valeo Equipment Electriques Moteur
LandOfFree
Rotating electric machine with permanent magnets and... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Rotating electric machine with permanent magnets and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rotating electric machine with permanent magnets and... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2484208