Electrical machine, in particular claw pole generator

Details Electrical machine, in particular claw pole generator Electrical machine, in particular claw pole generator

2000-01-24

2001-05-29

Nguyen, Tran (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S058000, C310S059000, C310S06000A, C310S06000A, C310S064000, C310S263000

Reexamination Certificate

active

06239519

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to an electrical machine, in particular a claw pole generator.
One of such generators is disclosed for example in the German patent document DE-PS 34 10 760. It however has the disadvantage that because of the groove-shaped intermediate spaces between the claws of the rotor, an insufficient ventilation and thereby also cooling take place. The groove-shaped intermediate spaces between the pole claws form relatively visible passages with the toothed stator wall which runs above. It has been shown that relatively large-volume whirl is produced in these intermediate spaces, and during alternating action with the pole claws or the stator, leads to noise emission. Further, the cross-section of the groove-shaped intermediate spaces periodically changes with the rotary movement due to the structure of the grooveslots in the stator wall. Thereby periodic pressure fluctuations are induced, which lead to noises in corresponding frequency band. The known air guiding vanes inserted in the intermediate spaces of the pole claws can further increase this noise.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide an electrical machine of the above mentioned general type, which avoids the disadvantages of the prior art.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated in an electrical machine, in particular a claw pole generator, in which in the intermediate spaces in their longitudinal direction, honeycombed structures through which a cooling medium passes, are arranged.
When the electrical machine is designed in accordance with the present invention it has the advantage that by closing the intermediate spaces between the claw poles, the large-volume whirl can not form any more. Thereby a significant noise reduction and an improved cooling are achieved. A further advantage is that the honeycombs which fill the intermediate spaces have a low weight with a high strength, in particular when the honeycombed structures have a light weight construction. Finally, the cooling of the rotor is improved because the passing air is no longer whirled.
The novel features which are considered as characteristic for the present invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.


REFERENCES:
patent: 4584496 (1986-04-01), Frister
patent: 4617485 (1986-10-01), Nakamura et al.
patent: 5107968 (1992-04-01), Delpassand
patent: 5306977 (1994-04-01), Hayashi
patent: 5532663 (1996-07-01), Herd et al.
patent: 5977668 (1999-11-01), Yoshioka
patent: 34 10 760 C 2 (1985-09-01), None

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