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Generator rotor blade pull-off force

Effect of Unbalanced Magnetic Pull of Generator Rotor on the

The rotor eccentricity is a typical manifestation of unit vibration, and the unbalanced magnetic pull force non-linearity of the unit under different vibration conditions is the key research object of rotor system modal analysis. As the eccentricity of the generator rotor increases, the unbalanced magnetic pull shows a non-linear trend to increase.

Analysis of Unbalanced Magnetic Pull of a Solid Rotor

Finite-element-method-based modeling of the electrical machine unbalanced magnetic pull and active magnetic bearing forces is carried out, and the results are used in the harmonic force analysis

Influence on the stability of generator rotors due to radial and

Therefore, it is of interest to calculate the forces that arise in a large synchronous generator with an eccentric rotor and study the influence these forces have on the stability of the generator

Nonlinear response of hydraulic turbine generator set caused by

Hydraulic turbine generator sets are crucial for harnessing water energy. However, the nonlinear phenomena resulting from the combination of unbalanced magnetic pull (UMP) and oil film forces

Dynamic Modeling and Vibration Characteristics for a

In order to study the transient dynamic characteristics for complex rotors suffering from blade off, a mathematical model for solving the response of the gas generator rotor in the aero-turboshaft engine is

(PDF) Effect of Generator Rotor Radial Deviation on

Effect of Generator Rotor Radial Deviation on the Unbalanced Magnetic Pull of 1000 MW Hydro-Generator Unit. magnetic pull force model and rotor model for a wide range of external forcing

Analysis of Torsional Dynamic Characteristics of Turbo-Generator Rotor

Purpose In this paper, the combined rotor system of turbo-generator is taken as the research object, and the variation law of interface contact stress, contact stiffness and torsional natural frequency of the combined rotor system during operation is deeply analyzed. Method A three-dimensional cross-scale dynamic model of the rotor is proposed based on the

Wind Turbine Blade Design

A detailed review of the current state-of-art for wind turbine blade design is presented, including theoretical maximum efficiency, propulsion, practical efficiency, HAWT blade design, and blade loads. The review provides a complete picture of wind turbine blade design and shows the dominance of modern turbines almost exclusive use of horizontal axis rotors. The

Failure analysis of generator rotor fan blades | Request PDF

In addition, installed on the spindle without elastic conjunction, blade No.10 vibrated and inevitably. spun off due to the large centrifugal force. Therefore, blade No.10 first cracked at the

(PDF) Unbalanced Magnetic Pull in Eccentric Rotor

The UMP as a function of terminal voltage and load is investigated for a typical hydroelectric generator with an off-centered rotor. The paper will in particular treat how iron saturation affects the magnitude of the magnetic pull force.

Influence on the stability of generator rotors due to radial and

The results of this study suggest that the excretion coefficient of the runner inlet, the initial position angle of the turbine blade, the up guide bearing, and the mass of the

Analysis on the Amplitude and Frequency Characteristics of the Rotor

occurs, the air-gap ﬁeld will be distorted, and generator rotor will be affected by unbalanced magnetic pull (UMP), thus the rotor will generate a radial vibration [15]. This provides the possibility to realize ISCFW on-line monitoring by means of collecting the generator rotor vibration signal of rotor and

Calculation and Analysis of Unbalanced Magnetic Pull Caused by Rotor

Therefore, various electromagnetic parameters are required to calculate the unbalanced magnetic pull force of the generator under no-load operating conditions based on the no-load characteristic curve of the generator. The absolute eccentricity of the rotor is preset to be e = 4.3724 mm, and the unbalanced magnetic pull force on the rotor

Implementation of Rod Vortex Generators on Helicopter Rotor Blades

The AH-1G helicopter rotor blade (Fig. 9.11) was selected for the numerical investigation of the forward flight conditions. During The Tip Aerodynamics and Acoustics Test (TAAT), performed by Cross and Watts, several arrays of absolute pressure transducers were placed on the rotor blades providing a large set of data. This flight test campaign

Dynamics of a hydropower generator subjected to unbalanced magnetic pull

In [23], a rotor dynamic model of electromechanical coupling was obtained to describe the rotor stability of the nonlinear magnetic pull under various shapes in the rotor, and the dynamic

Effect of Generator Rotor Radial Deviation on the Unbalanced

The authors used a two-dimensional (2-D) finite element (FE) calculation approach and the MST method to analyze the magnetic pull force versus load. The article developed a new magnetic

Dynamic Modeling and Vibration Characteristics for a High

In order to study the transient dynamic characteristics for complex rotors suffering from blade off, a mathematical model for solving the response of the gas generator rotor in the aero-turboshaft

Rotor Torque

Figure 14 shows a section of the rotor blade under the influence of the linear velocity due to rotation The rotor torque is measured with the torque sensor installed at the rotor shaft or the generator shaft. There are methods for obtaining rotor thrust using a thrust sensor or estimating the tower bending moment from strain gauges mounted

GENERATOR ROTOR TESTING

AC impedance test. The AC impedance test is used to find indications of shorted rotor turns. The test is performed by means of applying an AC voltage across the field winding and raising it in 10-volt steps up to 100-120 volts, or till the current supply gets maxed out.

The influence of nonlinear magnetic pull on hydropower generator

The usual way to calculate the influence of magnetic pull on a rotor is to apply the radial pull force at the generator spider hub, Fig. 1 gustavsson et al. [11] suggested a linear model where the distance between the spider hub and the generator rim centre is taken into consideration. In this paper, the influence of nonlinear magnetic pull on the rotor stability is

Investigation of fatigue fracture of generator-rotor fan blades

Sameezadeh et al. [4] investigated a damaged fan blade of a rotor-generator and according to their reports, high cyclic fatigue mechanisms induced to final failure with the large second particles

Rotor Inspection | part of Handbook of Large Turbo-Generator

This chapter talks about inspection of the rotor, mostly while removed from the stator. It aims to serve as a guide to learning the specific problems and failure mechanisms, and their identification that will make it possible to correctly assess intrinsic risks for a given design, and to notice explicit signs of deterioration, damage, and/or impending failure. In large machines, balance

Investigating Grid-Induced Turbo-Generator Vibrations: A

The most typical excitation phenomena that are taken into account in a rotor dynamic analysis are mechanical force excitations (e.g. unbalance) and flow related force excitations (e.g. steam forces). The electromagnetic forces in the air gap of the generator are also to be considered, especially when grid-induced excitation forces are present.

(PDF) Effect of Generator Rotor Radial Deviation on the

reveal the effect of the generator rotor radial deviation on the unbalanced magnetic pull of the unit. The effects of rotor dynamic eccentricity on the magnetic ﬁeld are analyzed in the...

(PDF) Calculation of unbalanced magnetic pull in a salient-pole

The unbalanced magnetic forces which act upon the rotor of a salient-pole synchronous generator due to eccentric motion of the rotor shaft in the presence of magnetic field originating from the

The Science Behind Wind Blades and How They Work

How Wind Blades Work. Wind turbine blades transform the wind''s kinetic energy into rotational energy, which is then used to produce power. The fundamental mechanics of wind turbines is straightforward: as the wind moves across the surface of the blade, it causes a difference in air pressure, with reduced pressure on the side facing the wind and greater

Generator rotor blade pull-off force [PDF]

6 FAQs about [Generator rotor blade pull-off force]

Can a magnetic pull force model be used in generator rotors?

The article [ 17] developed a new magnetic pull force model and rotor model for a wide range of external forcing frequencies. The model emphasizes the importance of the tangential component of the UMP compared to the previous model. The theory can be used in the design and analysis of generator rotors.

What causes a generator rotor to degrade?

One component of the generator that is typically refurbished, upgraded or uprated is the generator rotor (field). Degradation of the generator field can be caused by a number of factors, including a breakdown in insulation due to time and tem-perature and mechanical wear.

Does a gas generator rotor work with blade off?

The gas generator rotor, which is the core component of the aero-turboshaft-engine, usually runs between the second-order critical speed and the third-order critical speed and has richer dynamic characteristics than simple rotors. At present, works on the dynamic response of the turboshaft aero-engine with blade off are not reported.

What is a rotor blade in a wind turbine?

The rotor blade is the key component of a wind turbine generator (WTG) and converts the energy of the wind into a mechanically useful form of energy. It represents a significant cost factor in the overall context of the turbine and at the same time has an enormous impact on the yield of the turbine.

Are generator rotor and turbine runner deformed?

It is assumed that the generator rotor and turbine runner are not deformed during the operation of the unit, while the effect of the torsional action of the main shaft is ignored and the influence of the mass of the rotor shaft and the thrust bearing on the vibration state of the unit system is not considered.

What happens if a generator rotor is damaged?

This degrada-tion can lead to shorted turns, a field ground, or an in-service operational incident that can require premature maintenance work. The type of work needed to repair and upgrade depends upon the generator rotor design, length of time in service and the manner in which the rotor was operated.

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