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In this study, load sharing in tandem connected wound rotor induction motors and the effect of change in rotor resistance on load sharing were investigated. A mathematical model for a single motor was developed in MATLAB/Simulink. Then this model was doubled for two motors where the shaft speed feed-back is the same. Motors can be identical or different. The combined model and individual models are...
The most critical part of the induction machines which determines on their life time operation are rolling element bearings. To ensure reliable drive with an induction machine requires deep insight in electro-mechanical dynamics during its operation. The flexible multibody modeling technique enables the simulation of dynamic loads on all drive components. This paper focuses on complex dynamic modeling...
Precision centrifuge is an important test equipment in inertial navigation. In this paper, the problem of the accuracy of 2-DOF precision centrifuge is investigated and the unbalance balancing problem is completed while the precision centrifuge rotor unbalance exists. Firstly, based on the institutional arrangements of precision balancing centrifuge system, the existing forms of the unbalance of the...
This paper deals with the analysis of shaft loaded by magnetic force. The shaft deflection and critical speed are obtained by two methods: Transfer Matrix Method and Finite Element Method. The Finite Element Method is well known, however, the Transfer matrix method not. Therefore, the first section of this paper is focused on the brief introduction to this method. The results obtained by both methods...
In order to achieve reductions in wind turbine structural loads and to enable further increase of wind turbine rated power and dimensions, individual pitch control algorithms received significant portion of attention in the scientific community in the recent years. Individual pitch control typically reduces only the first loads harmonic, but as the wind turbines grow in size, it is expected that higher...
Classical objective of wind turbine control is to maximize the power extracted from wind. However, with the increase in wind turbine size the structural loads become a limiting factor for safe wind turbine operation and wind turbine operating life. In this paper we investigate the design of a model predictive controller that reduces wind turbine loads at the expense of wind turbine power variability...
The paper presents analysis of the torsional torques of a turbine generator rotor system in a meshed AC network with monopolar HVDC link following symmetrical and asymmetrical faults. The emphasis of the work is on establishing the influence of uncertainties in the mechanical parameters of turbine-generator shaft system on maximum torsional torques. Three loading conditions of turbine generator are...
This paper presents some results of an ongoing work aimed at studying a number of characteristics of rotating machines and how they are influenced by both constructive features and the way they are driven. The following will present the main results obtained when a simple one-stage inertia turbomachine is built with a linear, cylindrical shaft or, instead, with a shaft that has a small slot such as...
Low-frequency torsional resonance arising from large inertia load and elastic shaft causes vibration when industrial servo system is working, which degrades the system's performance of motion control. This paper presents an adjustable inertia ratio control strategy based on designing disturbance observer, which the inertia ratio between the load and rotor is adjusted to an optimal ratio so as to suppress...
In this paper, ANSYS finite element analysis software is used to simulate the twisted state of turbine integral rotor's discs. For various stepped shaft structure, the formula of ??-stiffness influence coefficient is fit by changing the geometric parameters of the equal-thickness disc, then equivalent diameter of stiffness is obtained. For the cone-shaped disc, the equivalent diameter of stiffness...
This paper presents modeling of a stepping motor with a full-step drive and design on the timing of the pulse inputs for the suppression control of vibration. When the stepping motor is shifted to the excitation phase, a torsional vibration occurs at the shaft part connecting to the motor due to an inertia load. Therefore, in the present study, a motor model considering a torsional vibration is designed...
To study the angular stability in a network of parallel connected synchronous machines, all system components which effect on the transient behaviour of the whole system have to be taken into account. This article investigates the possibility of starting up of the loaded synchronous motor in case of using three parallel-connected salient-pole machines feeding the asynchronous motor. A detailed model...
In this paper, the torsional interactions in the turbine- generator set due to electric arc furnace (EAF) load are presented. For this purpose a generator, two EAFs and a static VAr compensator (SVC) are considered in a power system. Different stages of EAF operation are modeled. At first stage the direct reduced iron ( DRI) and scrap are being melted and EAF is modeled as a pulsing load. At second...
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