Research of dampher system damage physical processes of synchronous machines rotor

The physical processes in the damper system of the rotor with the appearance of a static eccentricity of the rotor for two types of salient-pole synchronous machines - a capsule hydrogenator SGK 538/160-70M with a capacity of 22 MW and a synchronous generator with a capacity of 500 kW were investigated by means of mathematical modeling. A field mathematical model has been developed that takes into account the combined action of three physical fields of different nature: electromagnetic, temperature and field of thermomechanical stresses, and makes it possible to evaluate the heating and three-dimensional distribution of thermomechanical stresses in the structural elements of the rotor damper system of a salient-pole synchronous machine. These physical processes cause gradual destruction of the structure of the rotor damper system. It is proved that the primary cause of degradation and damage of the damping system of the rotor of an open-pole synchronous machine is the uneven distribution of induced currents in the rods at the poles of the rotor, which occurs when the machine works asynchronously or with the appearance of rotor static eccentricity. The largest induced currents and heat occur in the rods located at the edges of the pole pieces, while the central rods at the pole are heated significantly less. This asymmetric heating of the damping system of the rotor leads to significant thermomechanical stresses in the elements of the damping system of the rotor, which significantly depend on the magnitude of the eccentricity and slippery of the rotor in asynchronous mode. The magnitude of the total thermomechanical stresses in the rods is influenced not only by axially directed forces but also by transverse forces in the end short-circuiting elements. At considerable slippery and eccentricities there are inadmissibly big breaking forces which break cores and face short-circuiting elements of a damping system of a rotor. According to the results of the analysis, the heating and thermomechanical stresses of the structural elements were determined and recommendations for its structural improvement were given.

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INFLUENCE OF REGIME AND OPERATIONAL FACTORS ON THE DAMPER SYSTEM OF THE SALI-ENT-POLE SYNCHRONOUS MACHINE ROTOR

Tekhnichna Elektrodynamika ◽

10.15407/techned2021.02.047 ◽

2021 ◽

Vol 2021 (2) ◽

pp. 47-57

Author(s):

Yu.M. Vaskovsky ◽

◽

O.A. Geraskin ◽

◽

...

Keyword(s):

Synchronous Machine ◽

Stress Fields ◽

Structural Elements ◽

Physical Processes ◽

Thermomechanical Stress ◽

Structural Improvement ◽

Salient Pole ◽

Salient Pole Synchronous Machine ◽

Combined Action ◽

Physical Fields

The physical processes in the damping system of the salient-pole synchronous machine rotor, which cause the gradual destruction of its structure, have been studied. In particular, the distributions of currents, temperatures and thermomechanical stresses in the damping system rods during its operation in asynchronous and asymmetric modes of operation, as well as in case of rotor eccentricity. A field mathematical model has been developed that takes into account the combined action of three physical fields of different nature: electromagnetic, temperaturic, and thermomechanical stress fields, and allows estimating heating and thermomechanical loads in the damping system of the rotor of the salient-pole synchronous machine. According to the results of the analysis, the heating and thermomechanical loads of the structural elements were determined and recommendations for its structural improvement were given. References 9, figures 9, tables 1.

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Sensitivity Analysis of the Dynamic Behavior of a Salient-Pole Synchronous Machine Considering the Static Rotor Eccentricity Effect

Journal of Applied Research and Technology ◽

10.22201/icat.16656423.2012.10.5.363 ◽

2012 ◽

Vol 10 (5) ◽

Cited By ~ 1

Author(s):

I. Albino Padilla ◽

D. Olguín Salinas ◽

A. Román Messina

Keyword(s):

Sensitivity Analysis ◽

Synchronous Machine ◽

Operating Conditions ◽

Synchronous Machines ◽

Salient Pole ◽

Salient Pole Synchronous Machine ◽

Static Eccentricity ◽

And Performance ◽

The Impact

This paper presents the sensitivity analysis of the behavior of a synchronous machine using the winding functiontheory considering the effect of static air-gap eccentricity. The winding function theory as a method to calculate theinductances of synchronous machines from the geometry and the actual arranging of the windings is presented. Then,detailed numerical simulations are carried out to examine the impact of eccentricity on the steady state regimes. Theimportant role of static eccentricity and its links with various symmetrical and asymmetrical operating conditions arediscussed as well as its influence on the machine parameters and performance are investigated. Experimental andanalytical parameter results are presented for a 60 Hz, six-pole laboratory synchronous machine connected to aninfinite bus under various static eccentricity conditions.

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Off-Line Detection of Static Eccentricity in Salient-Pole Synchronous Machines

2018 XIII International Conference on Electrical Machines (ICEM) ◽

10.1109/icelmach.2018.8507042 ◽

2018 ◽

Cited By ~ 2

Author(s):

K. N. Gyftakis ◽

C. A. Platero ◽

S. Bernal

Keyword(s):

Synchronous Machines ◽

Line Detection ◽

Salient Pole ◽

Static Eccentricity

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Diagnosis and Magnetic Field Analysis of Small Power Salient-Pole Synchronous Generator with Static Eccentricity Using Time-Stepping Finite-Element Method

Electromagnetics ◽

10.1080/02726343.2011.558451 ◽

2011 ◽

Vol 31 (3) ◽

pp. 173-191

Author(s):

Jawad Faiz ◽

Mojtaba Babaei ◽

Jalal Nazarzadeh ◽

Bashir Mahdi Ebrahimi ◽

Sohrab Amini

Keyword(s):

Magnetic Field ◽

Finite Element Method ◽

Finite Element ◽

Synchronous Generator ◽

Field Analysis ◽

Small Power ◽

Time Stepping ◽

Salient Pole ◽

Magnetic Field Analysis ◽

Static Eccentricity

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Geometry Optimization of Synchronous Machines Used on Ship Shaft Generator Systems

Materials Science Forum ◽

10.4028/www.scientific.net/msf.792.245 ◽

2014 ◽

Vol 792 ◽

pp. 245-250 ◽

Cited By ~ 1

Author(s):

Athanasios G. Sarigiannidis ◽

C. Patsios ◽

A. Pittaras ◽

A. Kladas

Keyword(s):

Production Efficiency ◽

Electric Energy ◽

Geometry Optimization ◽

Synchronous Generator ◽

Operating Conditions ◽

Synchronous Machines ◽

Salient Pole ◽

Marine Applications ◽

Set Up ◽

Equal Power

In this paper, the geometry optimization and analysis of two synchronous machines for ship shaft generator applications was carried out. The use of shaft generators in marine applications is a convenient and effective way to supply electric energy to the ship, operating in conjunction with conventional diesel generators. On a first step, state of the art topologies of shaft generator systems are identified and evaluated. In addition, potential improvements in shaft generator systems are proposed. On a second step, a low-speed, direct-driven Permanent Magnet Synchronous Generator (PMSG) for shaft generator applications is designed and optimized in terms of torque production as well as efficiency. The PMSG is compared with an equal power Salient-Pole generator driven by a step-up gear, which is a set-up commonly used in shaft generator systems. The machines are evaluated and optimized in terms of torque production, efficiency and electromotive forces (EMF) harmonic content in nominal operating conditions.

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Designing TIMP (tissue inhibitor of metalloproteinases) variants that are selective metalloproteinase inhibitors

Biochemical Society Symposium ◽

10.1042/bss0700201 ◽

2003 ◽

Vol 70 ◽

pp. 201-212 ◽

Cited By ~ 51

Author(s):

Hideaki Nagase ◽

Keith Brew

Keyword(s):

Three Dimensional ◽

Therapeutic Interventions ◽

Tissue Inhibitors Of Metalloproteinases ◽

Structural Basis ◽

Structural Elements ◽

Ridge Structure ◽

Extracellular Matrix Components ◽

Metalloproteinase Inhibitors ◽

The Matrix ◽

A Disintegrin And Metalloproteinase

The tissue inhibitors of metalloproteinases (TIMPs) are endogenous inhibitors of the matrix metalloproteinases (MMPs), enzymes that play central roles in the degradation of extracellular matrix components. The balance between MMPs and TIMPs is important in the maintenance of tissues, and its disruption affects tissue homoeostasis. Four related TIMPs (TIMP-1 to TIMP-4) can each form a complex with MMPs in a 1:1 stoichiometry with high affinity, but their inhibitory activities towards different MMPs are not particularly selective. The three-dimensional structures of TIMP-MMP complexes reveal that TIMPs have an extended ridge structure that slots into the active site of MMPs. Mutation of three separate residues in the ridge, at positions 2, 4 and 68 in the amino acid sequence of the N-terminal inhibitory domain of TIMP-1 (N-TIMP-1), separately and in combination has produced N-TIMP-1 variants with higher binding affinity and specificity for individual MMPs. TIMP-3 is unique in that it inhibits not only MMPs, but also several ADAM (a disintegrin and metalloproteinase) and ADAMTS (ADAM with thrombospondin motifs) metalloproteinases. Inhibition of the latter groups of metalloproteinases, as exemplified with ADAMTS-4 (aggrecanase 1), requires additional structural elements in TIMP-3 that have not yet been identified. Knowledge of the structural basis of the inhibitory action of TIMPs will facilitate the design of selective TIMP variants for investigating the biological roles of specific MMPs and for developing therapeutic interventions for MMP-associated diseases.

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Calculation of Circulating Currents in Parallel Branches of Salient Pole Synchronous Machines

2020 International Conference on Electrical Machines (ICEM) ◽

10.1109/icem49940.2020.9270750 ◽

2020 ◽

Author(s):

C. Schepe ◽

E. Haschen ◽

B. Ponick

Keyword(s):

Synchronous Machines ◽

Salient Pole ◽

Circulating Currents

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A test of airborne, side-looking synthetic-aperture radar in central Newfoundland for geological reconnaissance

Canadian Journal of Earth Sciences ◽

10.1139/e91-025 ◽

1991 ◽

Vol 28 (2) ◽

pp. 257-265 ◽

Cited By ~ 14

Author(s):

D. F. Graham ◽

D. R. Grant

Keyword(s):

Surface Roughness ◽

Synthetic Aperture Radar ◽

Three Dimensional ◽

Synthetic Aperture ◽

Structural Elements ◽

Terrain Classification ◽

Regional Trends ◽

Valuable Complement ◽

Wide Swath ◽

Aperture Radar

Side-looking, C-band synthetic-aperture radar (SAR) penetrates cloud and fog, and operates day or night, to produce pseudo-three-dimensional terrain images with enhanced topography and surface roughness. The images, which have a 20 m resolution and cover large areas, have been used to map the regional trends, patterns of lineaments, and terrain types over a 6200 km2 area of complex lithology, structure, and drift cover. Four lineament classes are differentiated. Glacial trends are clear, and bedrock structures (faults, fractures, joints, foliation, and folded bedding) with relief expression at the surface show through the drift as lineaments. They accurately reproduce most known features when compared with bedrock and Quatenary geology maps. Hitherto unrecognized structural elements are revealed. Tones and textures reflect minute surface roughness variations useful in terrain classification. SAR wide-swath-mode imagery is thus a valuable complement to aerial photography, and is superior in revealing hummocky moraine, ribbed moraine, boulder fields and stony till. Wider use of this imagery is encouraged.

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Comparison of the reluctance laminated and solid rotor synchronous machine operating at high temperatures

COMPEL The International Journal for Computation and Mathematics in Electrical and Electronic Engineering ◽

10.1108/compel-10-2018-0405 ◽

2019 ◽

Vol 38 (4) ◽

pp. 1111-1119 ◽

Cited By ~ 2

Author(s):

Marcin Lefik ◽

Krzysztof Komeza ◽

Ewa Napieralska-Juszczak ◽

Daniel Roger ◽

Piotr Andrzej Napieralski

Keyword(s):

High Speed ◽

Design Methodology ◽

Three Dimensional ◽

Synchronous Machine ◽

Point Of View ◽

Heat Sources ◽

Model Calculations ◽

Content Type ◽

Thermal Phenomenon ◽

Practical Implications

Purpose The purpose of this paper is to present a comparison between reluctance synchronous machine-enabling work at high internal temperature (HT° machine) with laminated and solid rotor. Design/methodology/approach To obtain heat sources for the thermal model, calculations of the electromagnetic field were made using the Opera 3D program including effect of rotation and the resulting eddy current losses. To analyse the thermal phenomenon, the 3D coupled thermal-fluid (CFD) model is used. Findings The presented results show clearly that laminated construction is much better from a point of view of efficiency and temperature. However, solid construction can be interesting for high speed machines due to their mechanical robustness. Research limitations/implications The main problem, despite the use of parallel calculations, is the long calculation time. Practical implications The obtained simulation and experimental results show the possibility of building a machine operating at a much higher ambient temperature than it was previously produced for example in the vicinity of the aircraft turbines. Originality/value The paper presents the application of fully three-dimensional coupled electromagnetic and thermal analysis of new machine constructions designed for elevated temperature.

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