Stator Primary and Secondary Slot Wedges for Large Turbine Generators

A turbogenerator and slot wedge technology, which is applied in the direction of electrical components, electromechanical devices, electric components, etc., can solve the problems of broken magnetic stator wedges and the influence of safe operation of generators, etc., to reduce local overheating, enhance safety and stability The ability to operate, the effect of improving the ability to operate safely and stably

Active Publication Date: 2018-08-17
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under the above-mentioned multiple factors of electromagnetic force and temperature, it is not feasible to simply replace the non-magnetic stator wedges with magnetic stator wedges embedded in the stator slots for large turbogenerators. Under the action of the magnetic stator wedge, it is possible to break the magnetic stator wedge, which will affect the safe operation of the generator

Method used

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  • Stator Primary and Secondary Slot Wedges for Large Turbine Generators
  • Stator Primary and Secondary Slot Wedges for Large Turbine Generators
  • Stator Primary and Secondary Slot Wedges for Large Turbine Generators

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1, the upper slot wedge 1 (auxiliary slot wedge) adopts the cooling system structure of both magnetic and conductive alloy materials:

[0042] When the auxiliary slot wedge is made of both magnetic and conductive alloy materials, on the one hand, the auxiliary slot wedge can prevent the main slot wedge from falling off under the force of long-term operation, and on the other hand, it can play the role of magnetic slot wedge, reducing The harmonic content of the air gap magnetic field reduces the additional loss on the surface of the generator stator and improves the efficiency of the generator;

[0043] The secondary slot wedge itself has a unidirectional single ventilation hole or a unidirectional double ventilation hole.

Embodiment 2

[0044] Embodiment 2, the upper slot wedge 1 (auxiliary slot wedge) adopts a cooling system structure that is neither magnetically conductive nor electrically conductive insulating material:

[0045] When the auxiliary slot wedge is made of non-magnetic and non-conductive materials, the auxiliary slot wedge has a certain height from the slot, and the gap between the upper surface of the auxiliary slot wedge and the slot forms a ventilation slot;

[0046] The secondary slot wedge itself has a unidirectional single ventilation hole or a unidirectional double ventilation hole.

[0047] When the auxiliary slot wedge has a one-way single ventilation hole, the axial external ventilation hole is formed to directly cool the stator tooth core, improve the cooling capacity of the generator tooth, reduce the temperature rise of the tooth core, and avoid the thermal expansion of the stator core , loose;

[0048] When the auxiliary slot wedge has one-way and double ventilation holes, one f...

Embodiment 3

[0049] Embodiment 3. The structure of the cooling system with magnetic slot wedges embedded between the main and auxiliary slot wedges:

[0050] Such as image 3 As shown, the magnetic slot wedge 5 is embedded between the main slot wedge and the auxiliary slot wedge, and the magnetic slot wedge is entrained by the main and auxiliary slot wedges. The cooling method is the same as that of embodiment 2.

[0051] The advantages of embedding magnetic slot wedges are: the main and auxiliary slot wedges still use insulating materials that are neither magnetically conductive nor electrically conductive, which prevents the main slot wedge from falling off, and at the same time can reduce air gap harmonics by adding magnetic slot wedges content, improve efficiency; in addition, it can also prevent the single use of magnetic slot wedges, the magnetic slot wedges will be broken by alternating electromagnetic force, causing accidents.

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Abstract

The present invention relates to main and auxiliary slot wedges of a stator for a large-scale turbo generator, and the slot wedges are of a two-layer double slot wedge structure, wherein the upper slot wedge (1) is an auxiliary slot wedge, and the lower slot wedge (2) is a main slot wedge. The upper surface of the upper slot wedge is aligned with a notch, or the upper surface of the upper slot wedge is slightly lower than the notch. The main and auxiliary slot wedges of a stator for a large-scale turbo generator provided by the present invention can effectively reduce the losses and local high temperature of a generator rotor, reduce the harmonic content of a magnetic field in the air gap of a generator, protect the generator from the overheating of a terminal structural member of the generator, and improve the capability of safe and stable operation of the generator.

Description

technical field [0001] The invention relates to the electromagnetic, heat transfer and cooling technology of a large turbogenerator, in particular to the main and auxiliary slot wedges of the stator of the large turbogenerator. In particular, it refers to the main and auxiliary slot wedges of the magnetic / non-magnetic stator of a large turbogenerator and its cooling system. Background technique [0002] Due to the high electromagnetic load of a large turbogenerator, when it starts and stops frequently, its stator armature winding will receive a large radial electromagnetic force in the slot, and the stator armature winding will also have a large effect on the stator slot wedge force. Under the influence of electromagnetic force and temperature change, problems such as cracking and cracking of stator slot wedges will occur. [0003] In traditional generators, when the stator slot wedges are changed from non-magnetic stator slot wedges to magnetic stator slot wedges, the har...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H02K3/493H02K1/20
CPCH02K3/493
Inventor李伟力薛易王立坤李栋霍菲阳王国海焦晓霞张富全晋慧勇
OwnerBEIJING JIAOTONG UNIV