Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1987-07-01
1990-01-16
Skudy, R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 42, 310 51, 310 91, H02K 112
Patent
active
048945749
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a device for supporting a stator of an electric machine.
From FIG. 1, which shows a known embodiment form of the arrangement of the stator plates in a threephase generator between the two adjacent housing parts, it can be seen that the plates forming the stator are clamped and simultaneously centered in fitted boreholes of the A end shield 12 on the ventilator side and the B end shield 13 on the slip ring side, wherein the individual stator laminations 10 are held together by means of suitable rivet connections 11, for example, so as to be distributed along the circumference of the stator yoke. A disadvantage in such a known stator fastening is the coupling of the stator with the adjacent annular walls of the housing, this coupling being dynamically rigid, as a result of which the radiation surface responsible for noise generation in a threephase generator is considerably enlarged and, moreover, the self-resonant frequencies of the generator parts (stator, end shields) can be shifted under certain circumstances into particularly troublesome frequency ranges. In addition, in the known stator fastenings between the end shields 12 and 13 there is the possibility that a deformation of the stator will occur because of the assembly of the two housing parts and that the stator borehole 14 will possibly lose its roundness.
SUMMARY OF THE INVENTION
Therefore, the invention has the object of providing fastening possibilities for the stator in an electric machine, preferably in a threephase generator provided for the operation of motor vehicles, in which the stator is held in the housing securely and centrically with low noise generation.
In keeping with these objects and with other which will become apparent hereinafter, the device comprises an intermediate ring which is arranged radially outwardly of the outer annular surface of the stator yoke between the stator yoke and the housing parts, means for clamping the intermediate ring between the housing parts of the housing, and means for connecting the intermediate ring with the stator yoke has the advantage that the centric mounting of the stator in the housing of the threephase generator is substantially facilitated and a deformation of the inner borehole of the stator can be prevented to a great extent. In addition, it is particularly advantageous that the stator vibrations are not transmitted directly to the generator housing but, rather, via decoupling rings or sectors, so that a reduction of the noise radiated in the radial direction by the stator and the housing is achieved.
There are several advantages developements and improvements of the device. In a first embodiment form, it is particularly advantageous that stator surfaces are completely shielded externally by means of the arrangement of a decoupling ring which supports the stator yoke, wherein, in addition, the cylindrical annular surface of the stator is held at a predetermined distance relative to the decoupling ring; this spacing has a damping effect, and a sealing or damping substance, which additionally reinforces the damping effect, can be introduced in this spacing.
In another embodiment example of the invention, radial portions of the outer wall of the stator yoke are also held at a distance relative to a shielding decoupling ring, at least along predetermined circumferential angles, wherein the decoupling ring can be entirely dispensed with when the stator plates forming the stator yoke are preprocessed, that is, punched out, in such a way that a decoupling ring effect results in connection with a special housing shape.
BRIEF DESCRIPTION OF THE DRAWINGS
Embodiment examples of the invention are shown in the drawing and are explained in more detail in the following description.
FIG. 1 shows a considerably schematized presentation of a conventional support and clamping possibility for the stator yoke between the end shield, which abuts on both sides, and the end shield of the housing of a threephase generator, in section;
FIG. 2 shows a fi
REFERENCES:
patent: 1801124 (1931-04-01), Teighmann
patent: 1852829 (1932-04-01), Welch
patent: 2154146 (1939-04-01), Becker
patent: 2523520 (1950-09-01), Reinhard
patent: 2653257 (1953-09-01), Sailer
patent: 2953697 (1960-09-01), Wall
patent: 4469973 (1984-09-01), Guyot
patent: 4506180 (1985-03-01), Shizuka
Robert & Bosch GmbH
Skudy R.
Striker Michael J.
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