Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1988-10-07
1991-10-01
Skudy, R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 42, 310179, 310214, 310259, H02K 500
Patent
active
050536630
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a system for fixing an air-gap winding on the inside circumference of the stator lamination packet of high-power dynamo-electric machines, in particular turbo-generators
A) wherein the stator lamination packet that with its inside circumference defines the stator bore for the machine rotor revolving with an air gap is composed of the following: section in the yoke region, the lamination segments of which comprise magnetic material, screening packet, which system, at least in the vicinity of the bore, comprises nonmagnetic material and at abutment points, which are distributed over the inside circumference of the screening packet, is rigidly connected to the screening packet,
B) wherein the winding bars of the air-gap winding can be inserted, with a radial excess protrusion protruding beyond the slot teeth into the air gap, into the circumferential interstices serving as axially parallel bar receiving slots, which are each defined in the tangential direction by successive slot teeth, and are fixable in their introduced position by means of a retaining device resting with a large area of contact against the winding bar sides oriented toward the stator bore and pressing the winding bars against the slot bottom.
A system of this kind is known from German Patent 29 24 863. There, the individual slot segment bar groups are covered by pressure strips extending axially of the machine, and in the space between two pressure strips tangentially adjacent one another, radial clamping screws distributed over the length of the lamination packet are disposed in the vicinity of the slot teeth, these screws being screwed into anchorage points of the lamination packet. These screws for instance comprise axial bolts provided with radial threaded bores and insulated on the outside, which are inserted into corresponding axial bores of the lamination packet. On their outer end, the clamping screws engage the side region of the two tangentially adjacent pressure strips, by means of retaining strips extending axially of the machine. In this known system, the tooth region is thus occupied by the clamping screws for the radial tensioning. The tangential tensioning is not mentioned in this German Patent; it might be possible, by the insertion of suitable wedges into the set of slot segment bar groups, to convert a portion of the radial tension forces into tangential bracing forces. However, in that case the means for radial and tangential bracing of the air-gap winding would not be independent of one another within the various bar receiving slots.
The same is true for a further system of this generic type for fixing an air-gap winding as described in German Published, Prosecuted Patent Application DE-AS 21 65 678. There, for radial bracing of the stator winding bars placed in the slots of a slot-and-tooth system, an insulating cylinder is introduced into the stator bore of the stator lamination packet, but on the condition that the stator winding bars, in their inlaid state, still have a certain radial protrusion beyond the slot teeth, so that by means of the introduced insulating cylinder the bars can be pressed against the base of the slot, far enough that the outside circumference of the insulating cylinder rests on the tops of the teeth. The assembly or dismantling of an insulating cylinder extending over the entire lamination packet length, and which for bringing to bear the required radial bracing forces must have a certain wall thickness, prove to be very difficult. Furthermore, as indicated, only a radial bracing is effected with the insulating cylinder, and if tangential bracing forces were also generated by means of suitable wedges, then it would not be possible to adjust the radial and tangential bracing independently of one another.
It is the object of the invention to embody the generic system for fixing an air-gap winding such that the region of the axial set of slot teeth can be kept free of clamping elements for the radial bracing of the winding during operation, or at least can be embodied su
REFERENCES:
patent: 3157939 (1964-11-01), Balke
patent: 4137471 (1979-01-01), Sasto
patent: 4228375 (1980-10-01), Beermann
patent: 4292558 (1981-09-01), Flick
patent: 4356419 (1982-10-01), Boer
patent: 4431932 (1984-02-01), Nathenson
Boer Joachim
Sommer Fritz
Greenberg Laurence A.
Lerner Herbert L.
Siemens Aktiengesellschaft
Skudy R.
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