This article presents a comprehensive analysis on the end winding vibration characteristics due to different stator inter-turn short circuit (SISC) positions in synchronous generators. Different from other studies, this not only pays attention effect of SISC electromagnetic forces, but also considers impact position, which is related static air-gap eccentricity, vibrations at meantime. The whole work based qualitatively theoretical analysis, finite element (FEA), and experimental validation...

This paper proposes a novel hybrid model for analyzing the electromechanical characteristics under stator interturn short-circuit (SISC) fault in synchronous generators. The of lies that it considers static air-gap eccentricity and SISC at same time. Different from other studies, proposed can manage not only impact degree, but also influence positions on magnetic flux density (MFD), which is basis to analyze characteristics. phase current electromagnetic torque (EMT) are selected this as...

In this article, the qualitative theoretical derivation, together with finite element analysis and experimental studies are presented to investigate unbalanced magnetic pull (UMP) as well rotor vibration characteristics. Differently from previous studies, study focuses on UMP/vibration not only under normal conventional radial eccentricity conditions but also for three‐dimensional (3D) hybrid static air‐gap (SAGE) cases which composed of both SAGE axial SAGE. The detailed UMP expressions...

This paper presents a comprehensive study on the variation laws of electromagnetic torque (EMT) under static air-gap eccentricity (SAGE) conditions in synchronous generators. Different from other studies, this focuses not only impact radial SAGE, but also effect axial and hybrid EMT fluctuation characteristics, i.e., we actually 3D rotor eccentricity. The theoretical analysis model is first set up to influence SAGE magnetomotive force (MFD) EMT. Then, finite element calculation experimental...

This paper mainly focuses on the impact of inclined static air gap eccentricity (ISAGE) electromagnetic characteristics and mechanical performances (vibration, deformation, strain stress). Considering different ISAGE fault types in theoretical finite element analysis (FEA) model synchronous generators, effects intersection position rotor center axis stator axis, angle, combination previous two MFD, phase current radial magnetic pulling per unit area (MPPUA) are analyzed compared. Then, based...

A brand new phenomenon, namely, electrical conduction via soliton-like ultra fast space charge pulses, recently identified in unfilled cross-linked polyethylene, is shown for the first time to occur insulating polymer nanocomposites and its characteristics correlated with electromechanical properties of nanostructured materials. These pulses are observed cross insulation under low field epoxy-based containing nanosilica particles relative weights 1%, 5%, 10%, 20% at speeds orders magnitude...

This paper provides an in‐depth study of the winding mechanical properties in generators under rotor interturn short circuit (RISC) cases. Unlike previous studies, this research investigates not only influence RISC degrees, but also positions and eccentricity on properties. The electromagnetic force (EF) formulas as well electromagnetic‐structure coupling model are first proposed to derive response characteristics, such vibration, deformation, strain, stress. Subsequently, both finite...

The static air gap eccentricity is one of the prevalent faults in permanent magnet synchronous generators. In previous studies, variation magnetic flux density, stator current and vibration have been studied mostly. However, temperature characteristic winding insulation under 3D fault rarely investigated. As a supplement, this paper comprehensively analyzes influence radial eccentricity, axial combined (radial eccentricity) on thermal response. whole work based not only loss core windings...

Abstract In this study, the rotor loss as well temperature variations due to static air‐gap eccentricity (SAGE) and inter‐turn short circuit (RISC) in synchronous generators is presented. Different from previous studies, study investigates loss/temperature changes under not only single SAGE fault RISC but also combined faults (CF) that are composed of these two faults. Detailed formula derivation on hysteresis (HL) eddy current (ECL), together with rise varied types different operating...

This paper presents a comprehensive analysis on the transient electromagnetic force behavior of stator windings in QFSN-600-2YHG type turbo-generator. Different from other studies, this investigates not only distribution regularities resultant and density, but also harmonic characteristics, mechanical responses which will cause sensitive impact insulation wearing. The whole work is generally based proposed simplified model 3D finite element coupling calculation. contains two parts. first...

Abstract This article has conducted a comprehensive study on the stator and rotor vibration characteristics of doubly‐fed induction generator (DFIG) in case radial air gap eccentricity (RAGE). Differently from other previous studies, this paper not only investigates static (RSAGE) dynamic air‐gap (RDAGE) fault but also takes hybrid (RHAGE) into account. Through theoretical derivation, detailed expressions magnetic pull per unit area (MPPUA) unbalanced (UMP) are obtained. The finite element...

In this paper, qualitative theoretical derivations, finite element analysis (FEA) and experiments are used to investigate the electromagnetic force (EF) vibration characteristics of end windings. contrast previous studies, study focuses not only on winding EF/vibration under normal radial static air gap eccentricity (RSAGE) conditions, but also for cases dynamic (RDAGE) hybrid (RHAGE). Firstly, magnetic flux density (MFD) is derived (RAGE) faults, detailed EF expressions obtained before...

Besides the static stator interturn short circuit (SSISC), dynamic (DSISC) may also occur in synchronous generators. However, at present, there is no effective model which can effectively analyze generator characteristics under DSISC and identify fault. To address this issue, paper creatively presents a novel analysis of for first time. The degree position are taken into consideration. Besides, rotor vibration comprehensively analyzed compared SSISC. Further, finite element (FE) calculation...

The mechanical properties and insulation damage of stator end windings in permanent magnet synchronous generator (PMSG) are investigated by theoretical analysis, finite element analysis (FEA) experiment verification. First, a model the winding electromagnetic force (EF) vibration response before after eccentricity faults established. Then, stress/strain distribution under different working conditions is analyzed. Finally, behavior with initial cracks studied characterized using stress...

This paper presents a designed experimental simulation scheme for dynamic air gap eccentricity (DAGE) faults in permanent magnet synchronous generator (PMSG), along with the testing of their electromechanical characteristics. Unlike previous studies, this proposes and applies an device setting that enables accurate convenient calibration DAGE fault degree, offering novel solution practical simulation. The unit measures characteristics PMSG before after fault, taking into account influence...

Static air gap eccentricity (SAGE) is a common mechanical fault in permanent magnet synchronous generators (PMSG). Currently, detection mainly based on inductance, back electromotive force, stator vibration, electromagnetic torque, etc. Differently from the other research, this paper focuses unbalanced magnetic pull (UMP) characteristic and response rotor to find approach for diagnosing SAEG reveal dangerous positions of rotor, also taking into account load changes. A 5Kw PMSG with 10 pole...

This paper presents a completed investigation on the electromagnetic force characteristics of stator end windings under inter-turn short circuit (SISC) conditions. Not only single SISC or static air-gap eccentricity (SAGE) case are considered, but also takes combined impact and SAGE condition into account at same time. The entire work depends theoretical analysis finite element method (FEM) verification. It is found that will be increased tremendously when happens, particularly 2nd, 4th 6th...