Electric machine and rotor for use therein

Details Electric machine and rotor for use therein Electric machine and rotor for use therein

1999-11-02

2001-05-01

Ramirez, Nestor (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S216055, C310S215000, C310S269000

Reexamination Certificate

active

06225723

ABSTRACT:

BACKGROUND OF THE INVENTION
This invention relates to an electric machine, for example a generator suitable for use in aerospace applications, and to a rotor suitable for use in such an application.
In aerospace applications, it is common for the rotor of a generator to rotate at high operating speeds, for example at speeds in excess of 24000 rpm. As tight volume and weight constraints apply to components for use in aerospace applications, it is desirable to provide an electrical generator which is capable of producing a high output without significantly increasing the dimensions of the generator.
Existing generator rotors have been designed in such a way that flux saturation of parts of the rotor material occurs. In order to increase the available output of the generator, it is desirable to increase the amount of pole material without increasing the overall dimensions of the rotor. It is an object of the invention to provide an electric machine and a rotor for use therein which permits the amount of pole material to be increased for a rotor of given dimensions.
BRIEF SUMMARY OF THE INVENTION
According to the present invention there is provided a rotor for use in an electric machine, the rotor comprising a rotor body provided with a plurality of slots, each slot housing electrical conductors of two independent coils, the conductors being secured in position by an outer wedge member, an inner wedge member being located between the outer wedge member and the conductors, the rotor including pole tips defining load bearing lips located adjacent the radially outer edges of each slot, wherein a part of each coil projects beyond the respective lips in a direction perpendicular to the axis of the coil.
By arranging for the coils to project beyond the load bearing lips, for a coil composed of a given number of turns of a conductor of given dimensions, an increased amount of pole material is available. In effect, the parts of each coil located within two adjacent slots are spaced apart from one another by an increased amount. In order to accommodate the conductors within the slots without increasing the dimensions of the rotor, the inner and outer wedge members are conveniently of modified shape.
Preferably the face of the outer wedge presented to the inner wedge is recessed in its region(s) of contact with the inner wedge.


REFERENCES:
patent: 4748354 (1988-05-01), Toshima
patent: 5973432 (1999-10-01), Katagiri et al.
patent: 59213244 (1984-03-01), None
patent: 2465349 (1979-09-01), None
patent: 0079584 (1982-11-01), None
Anderson et al., “electric motors”, Theodore Audel & co., cover page, and , p. 12-15, 1895.

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