Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
1999-01-19
2001-10-02
Enad, Elvin (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S06700R, C310S051000, C310S058000, C310S061000, C310S062000, C310S063000, C310S065000, C310S089000, C310S263000
Reexamination Certificate
active
06297571
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an electrical machine, in particular a fluid-cooled three-phase alternating current generator.
Such electrical machines are known in the art. One of such machines are disclosed for example in the German patent document DE-PS 43 42 870. The cooling of the claw pole system in this electrical machine is performed by heat conduction of the ball bearing, by radiation to the stator and the housing, by convection on the belt pulley, as well as by convection of the closed housing. In such machines temperature and cooling problems occur at very high rotary speeds, for example greater than 15,000 per minute, since the iron loses in the rotor system as well as the ball bearing losses increase with the rotary speed. A sufficient cooling is therefore no longer guaranteed in machines of the above mentioned type.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide an electrical machine of the above mentioned 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 present invention resides, briefly stated, in an electrical machine in which the blower means are formed substantially as radially extending blower vanes provided on a substantially flat end side of a pole ring which is located at a side opposite to the drive system, and a ring space closes in the axial direction the blower vanes as a part of the housing bottom.
When the electrical machine is designed in accordance with the present invention, it has the advantage that the cooling is substantially improved due to forced convection and meaningful airflow inside the machine.
The inventive blower efficiently solves this problem with the airflow rate which increases with the increasing rotary speed, and especially at the high rotary speeds.
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: 4286187 (1981-08-01), Binder
patent: 4959576 (1990-09-01), Horibe et al.
patent: 5237230 (1993-08-01), Sugiyama et al.
patent: 5270605 (1993-12-01), Lefraincois et al.
patent: 5751088 (1998-05-01), Mukai et al.
patent: 5763968 (1998-06-01), Hayashi et al.
patent: 5777407 (1998-07-01), Ishida et al.
patent: 6011332 (2000-01-01), Umeda et al.
patent: 43 42 870 C1 (1995-10-01), None
Enad Elvin
Robert & Bosch GmbH
Striker Michael J.
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