Faculty of Electrical Engineering and Information Technologies

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End date: 2009Language: search.filters.language.English

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    Weight reduction of permanent magnet disc motor for electric vehicle using genetic algorithm optimal design procedure
    (IEEE, 2009-05)
    Cvetkovski, Goga V.
    ;
    Petkovska, Lidija B.
    In this paper a topology optimal design of a permanent magnet disc motor (PMDM) based on total motor weight minimisation is performed. In the design procedure performed on the PM disc motor, genetic algorithm, as an optimisation tool is used. The application of the permanent magnet disc motor is in electric vehicle and therefore it is essential the weight of the motor to be as minimal as possible. Comparative values of the improved motor parameters in relation to the basic model for both models are presented.
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    Comparison between two target functions for optimization of single phase shaded-pole motor using method of genetic algorithms
    (Elsevier BV, 2005-04)
    Sarac, Vasilija
    ;
    Petkovska, Lidija
    ;
    Cundev, Milan
    ;
    Cvetkovski, Goga
    Method of genetic algorithms (GAs) has been started to be widely used, as an optimization technique of electrical machines, in the recent years. In this paper the GA method will be applied on the shaded-pole motor, aiming towards an improvement of its operational and performance characteristics. The authors develop two new improved motor models, starting from the basic one. In the first motor model the electromagnetic torque, as a target function for optimization is suggested, while in the second one the optimization is based on the efficiency factor, used as a target function. The results gained from the both motor models are analyzed and compared to the basic model. The conclusions regarding the more favorable target function for optimization of a single phase shaded-pole motor are presented.
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    Performance Evaluation of an Axial Flux PM Motor Based on Finite Element Analysis
    (IOS Press, Amsterdam, 2006)
    In this paper a performance analysis of an axial flux PM motor based on finite element analysis (FEA) is presented. The quasi-3D method which is adopted for this analysis is consisted of a 2D FEM calculation of the magnetic field in the three dimensional radial domain of the disc motor. The magnetic field distribution is calculated at different armature current and different rotor displacements for all five segments of the motor. Using the results from the FEA the electromagnetic and electromechanical characteristics are going to be presented and a performance evaluation of the motor will be carried out.
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    Genetic Algorithm Coupled with FEM-3D for Metrological Optimal Design of Combined Current-Voltage Instrument Transformer
    (Emerald Publishing Limited, 2004-09-01)
    Marija Cundeva, Ljupco Arsov, Goga Cvetkovski
    he combined current‐voltage instrument transformer (CCVIT) is a complex non‐linear electromagnetic system with increased voltage, current and phase displacement errors. Genetic algorithm (GA) coupled with finite element method (FEM‐3D) is applied for CCVIT optimal design. The optimal design objective function is the metrological parameters minimum. The magnetic field analysis made by FEM‐3D enables exact estimation of the four CCVIT windings leakage reactances. The initial CCVIT design is made according to analytical transformer theory. The FEM‐3D results are a basis for the further GA optimal design. Compares the initial and GA optimal output CCVIT parameters. The GA coupled with FEM‐3D derives metrologically positive design results, which leads to higher CCVIT accuracy class.
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    Genetic Algorithm Coupled with Finite Element Method as an Optimization Tool of a Resistance Welding Transformer
    (IOS Press, Amsterdam, 2002)
    S. Cundeva, L. Petkovska, M. Cundev, G. Cvetkovski
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    Genetic Algorithms-Case Based Hybrid Approach for Linear Actuators' Parameters Optimisation
    (IOS Press, 2002)
    V. Stoilkov, M. Cundev, L. Petkovska, G. Cvetkovski
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    Performance characteristics improvement of a PM disk motor by using soft magnetic composite material
    (IOS Press, 2002-12-17)
    Cvetkovski, Goga
    ;
    Petkovska, Lidija
    ;
    Cundev, Milan
    ;
    Gair, Sinclair
    The paper presents a comparison of the magnetic field and magnetic characteristics of a PM disk motor with laminated magnetic stator open slot core, laminated magnetic stator closed slot core with soft magnetic composite and soft magnetic composite stator core. The data for this analysis is provided by a 2D FEM calculation of the magnetic field. After the proper modelling of the motor a calculation of the magnetic field for no load and current load is performed, for the three models. The results of the magnetic field distribution, air gap flux density distribution and the values of the magnetic and electric parameters for the three models are also presented.
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    GA Approach in Design Optimisation of a PM Disk Motor
    (Emerald Publishing Limited, 2000)
    Goga Cvetkovski, Lidija Petkovska, Milan Cundev, Sinclair Gair
    The paper presents a novel quasi 3-Dimensional Finite Element Method (3D FEM) analysis of a double sided permanent magnet disk motor for electric vehicle. This method is used for a magnetic field analysis of the prototype and the optimal solution. The optimal solution is a product of an optimisation procedure using genetic algorithm as an optimisation tool.
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    FEM Shaping of the Air-gap Flux in Permanent Magnet DC Commutator Motor
    (MCB University Press, 1995)
    Goga Cvetkovski, Lidija Petkovska, Milan Cundev
    This paper deals with an analysis of the effects on the electromagnetic characteristics by changing the dimensions of the permanent magnets such as the overlap angle of the permanent magnets (α) and the radial height of the permanent magnets (hpm) and/or by changing the air‐gap length (δ) and the coil span (y) of the rotor winding.
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    Hybrid analytical - FEM analysis of single phase Permanent Magnet Synchronous Motor
    (IEEE, 2009-05)
    Petkovska, Lidija
    ;
    Cvetkovski, Goga
    Self-starting single-phase Permanent Magnet Synchronous Motors (PMSM) are widely accepted as low-power motors in many domestic appliances. In the paper a hybrid analytical–FEM approach for full performance analysis of a PMSM is presented. At the beginning, the magnetic circuit theory as an essential approach and Finite Element Method (FEM) as a powerful numerical approach are employed for determination of the most important parameters and steady-state characteristics. After, obtained outcomes are implemented in a simulation approach based on a MATLAB/Simulink environment. The final results are the dynamic characteristics, developed for variety of the motor starting conditions. On the basis of the determined characteristics, the full performance analysis, including steady-state and transient operation of the studied motor is carried out.