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2017 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM) & 2017 Intl Aegean Conference on Electrical Machines and Power Electronics (ACEMP)
The article presents a study to determine the thermal transmittance for buildings different walls structure. Thermal transmittance is used especially in western European countries to indicate the rate of heat transfer for different components of buildings: walls, ceilings, floors, windows, doors, etc. The first part of the article includes several thermal transmittance introductive notions. The second...
This article proposes the research and simulation of general bars of medium voltage metal enclosed switchgear, made of aluminum bars with copper contacts, in order to find a similar or even more convenient solution than that of copper bars, both from a technical and economic point of view. The goal is to improve heat distribution at the passage of the current, in the bar and particularly in contacts,...
Magnetocrystalline anisotropy of iron borate is expected to have two contributions: the crystal field one and the dipole-dipole one. The crystal field contribution is calculated through the perturbation theory using the spin Hamiltonian parameters of isolated Fe3+ ions in diamagnetic gallium borate. The dipole-dipole interaction energy is calculated for two models of extended dipoles having non-negligible...
A study of voltage and current wave distortions on a photoelectric power plant of 17 MW in the hard winter conditions of 2016–2017, with much snow and high frost, is presented. By means of a Isikawa diagram, the authors wish to familiarize the reader with causes of current and voltage wave distortion. The study case is accomplished by measurements in two points, using class A equipment. The obtained...
This paper introduces a high performance (90% efficiency) 3kW, 3000/3600rpm, 50/60Hz 1 phase autonomous PM generator with (8+2)kg total weight and simplified control (switched capacitor) control for max ±7% voltage regulation from pure resistive to resistive inductive (0.8 power factor, lagging) loads. Topology, design principles, FEM based characterization are accomplished by modeling for steady...
An analytical method is developed to extract a feature and recognize a pattern for dynamic and static eccentricity fault diagnosis in salient-pole synchronous generators (SPSGs). The amplitude of side-band components of no-load voltage at particular frequencies are determined. The pattern of electromotive force is processed in order to detect eccentricity fault in SPSGs. The competency of the developed...
A study is carried out using the Alternative Transients Program (ATP) to simulate a three-phase induction motor fed from a single-phase ac source and balanced with two static var compensators (SVCs). Two methods, a speed feedback (SF) method and a perturbation and observation (PO) method, are proposed to control the SVCs. As per the simulation results, both methods allow the motor to operate as supplied...
The paper presents the inductances and rotor resistance estimation - using FEM - for the closed slot induction machine. One presents the variations of inductances and rotor resistance as function on current and frequency for emphasizing their dependence upon the saturation level of the machine. So it is possible to estimate the machine parameters for a large area of the operating modes.
Induction motor is utilized in wide area of electric drive applications. If sophisticated control of speed or torque is required, the actual rotor angular velocity must be known at every time instant. To obtain the speed information, an optical sensor is usually utilized. However, the usage of such sensor brings some undesired effects. The paper compares two very often used methods on a specific induction...
In this paper there is analyzed the dynamic behavior of a reluctance synchronous motor with continuous rotation in case of supply to a vector-control converter. In this purpose a simulation program has been conceived; it is based on the motor equations written in the two-axis theory. The model used is an original form, with combined variables. It can be used for any type of synchronous machine. The...
With the advent of permanent magnet synchronous motors (PMSM), not only efficiency of elevator systems increased but also mechanical tensions decrease significantly. In this paper comprehensive design of PMSM for gearless elevators will be evaluated and Finite Element Method (FEM) is used to modeling of the designed motor. Fractional pitch slots, number of slots and the harmonic components will be...
This paper analyses a torque control structure for load machine used as a dynamometer. Typical area of the use is a mimicking of a mechanical load behaviour in case the mechanical load is not available. Instead of that, the mechanical load is emulated by the load machine with specific torque control. This approach belongs to dynamic emulation of mechanical load methods. Reference torque calculation...
In this paper, a multi-objective optimisation procedure based on the non-sorted genetic algorithm-II (NSGA-II) for the design of a buried PM wind generators with variable-flux is presented. A comparative analysis is carried out for optimised 13 kW, 100 kW and 1 MW buried-PM variable-flux synchronous generators (VFSG) with PMs buried deep in the rotor cores and additional rotor field coils. A design...
This paper deals with the design of an interior permanent magnet machine having rectangular flat-shaped magnets. The electromagnetic performances are calculated using finite-element analysis (FEA) considering different operating points. The mechanical integrity of the rotor at maximum speed (35,000 rpm) is analyzed, as well as PM demagnetization under short-circuit. It is shown that 3 PM segments...
A Ladybird High Speed Synchronous Reluctance Machine (LB-HS-SynRM) with deterministic rotor parameterization has been studied. The primary aim is to derive design rules for SynRM optimization with a novel Ladybird rotor topology. The second goal is to investigate the effect of parameters on machine performance. The 3D nature of the rotor can only be handled by 3D FEM simulations, therefore, 3D FEM...
This paper deals with the optimization of a single side Axial Flux Permanent Magnet machine (AFPMM) designs with respect to cogging torque. Although the AFPMMs run generally at high speed and high torque, these machines may run at lower operational speed for aircraft applications. At lower operational speed, the cogging torque is an undesirable effect. Firstly, a reference AFPMM is designed with Finite...
Energy in the world is one of the priority issues and energy demand is rapidly increasing depending on the growing population and industry. The usable energy sources in the world are to be insufficient to meet the energy need. Therefore, the efficient and economical usage of energy sources is getting great importance. In a survey conducted among electric consuming machines, the electrical machines...
For model-based predictive control methods it is essential to predict the reaction of the whole system. Sampling of the converter-output-voltages needs unreasonably high sampling rates and is generally avoided. In consequence the converter behavior itself becomes a part of the model. This paper provides a theoretical description of the most relevant effects and gives guidelines for modeling the converter...
The purpose of this article is to perform a modal analysis for a three phase induction motor (11kW–1000 rpm), premium efficiency IE3 category. Modal analysis involves determining the frequencies and vibration modes. The analysis was accomplished on the main components of the motor and the entire assembly.
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