The Experts below are selected from a list of 174 Experts worldwide ranked by ideXlab platform
Vasilija Sarac - One of the best experts on this subject based on the ideXlab platform.
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Impact of Capacitor on operating characteristics of single-phase Motor
2019 16th Conference on Electrical Machines Drives and Power Systems (ELMA), 2019Co-Authors: Vasilija Sarac, Neven TrajchevskiAbstract:The permanent-split Capacitor Motor is well known for its good power factor, due to the permanently connected Capacitor, and low starting torque. Therefore, this paper sets an extensive analysis of the impact of the Capacitor size on Motor starting and running characteristics. A model of the Motor suitable for computer design is set, based on producer's data. For various Capacitors, all Motor parameters and characteristics are calculated. The Capacitor size affects the starting torque i.e. the bigger Capacitor, the higher the Motor starting torque. FEM is applied for computing flux density distribution and Motor torque for all Motor models. Adequate conclusions from obtained results of all models have been derived.
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Multiparameter Analysis for Efficiency Improvement of Single-Phase Capacitor Motor
Mathematical Problems in Engineering, 2019Co-Authors: Vasilija Sarac, Tatjana Atanasova-pacemskaAbstract:Single-phase Motors are known for their small power ratings and their usage in various household appliances. Although they are not large electricity consumers, their widespread application contributes to the overall electricity consumption. In addition, standard IEC 60034-30-1:214 defines the efficiency levels for single- and three-phase Motors and stipulates the increased electrical efficiency for the electrical Motors. Therefore, this paper sets the parametric analysis of permanently split Capacitor Motor with five different design parameters that have impact on the efficiency of the Motor. As an output from the parametric analysis, two different optimized Motor models are obtained with increased efficiency. The impact of each parameter on Motor efficiency—as well as on the other operating characteristics, like starting torque, overloading capacity, rated current, starting current, total losses, and power factor—is analyzed and adequate conclusions are derived. The obtained Motor models are verified with Finite Element Method (FEM) for magnetic flux density distribution.
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Permanently split Capacitor Motor-study of the design parameters
Journal of Electrical Engineering-elektrotechnicky Casopis, 2017Co-Authors: Vasilija Sarac, Goce StefanovAbstract:Abstract Paper analyzes the influence of various design parameters on torque of permanently split Capacitor Motor. Motor analytical model is derived and it is used for calculating the performance characteristics of basic Motor model. The acquired analytical model is applied in optimization software that uses genetic algorithms (GA) as an optimization method. Optimized Motor model with increased torque is derived by varying three Motor parameters in GA program: winding turns ratio, average air gap flux density and Motor stack length. Increase of torque has been achieved for nominal operation but also at Motor starting. Accuracy of the derived models is verified by Simulink. The acquired values of several Motor parameters from transient characteristics of Simulink models are compared with the corresponding values obtained from analytical models of both Motors, basic and optimized. Numerical analysis, based on finite element method (FEM), is also performed for both Motor models. As a result of the FEM analysis, magnetic flux density in Motor cross-section is calculated and adequate conclusions are derived in relation to core saturation and air gap flux density in both Motor models.
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Genetic algorithm in torque optimisation of permanently split Capacitor Motor
2016 International Conference on Smart Systems and Technologies (SST), 2016Co-Authors: Vasilija Sarac, Biljana Citkuseva-dimitrovskaAbstract:Paper investigates permanently split Capacitor Motor of type FMR-35/6, with respect to torque optimization. For this purpose, mathematical model of the Motor is derived with the output torque as an objective function for optimization. Motor mathematical model is applied in program developed in the C++ language, which performs the optimization using Genetic Algorithm (GA). Several input design parameters of the Motor are varied simultaneously in the GA program. The program gives the best set of varied parameters for which the torque is increased, and consequently a new optimized model of the Motor is obtained. Output torque of the optimized Motor is increased at rated operating point as well as during Motor start. Matlab/Simulink models are designed for obtaining the transient characteristics of the currents, speed and torque. The results from the Simulink models are compared with the results from the mathematical models of the Motor-basic and optimized, in order accuracy of the both mathematical models to be verified. Finally, magnetic flux density and its distribution in the cross-section of the Motor models are determined for different operating regimes by using Finite Element Method (FEM).
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STUDY OF PERFORMANCE CHARACTERISTICS OF SINGLE PHASE MotorS
2016Co-Authors: Vasilija Sarac, Goce Stefanov, Goran CogeljaAbstract:Single phase shaded pole Motor and permanently split Capacitor Motor are analyzed with double-filed revolving theory and method of symmetrical components is used for defining Motor mathematical models. As an output from mathematical models steady-state performance characteristics of both Motors are calculated for different operating regimes. Results from developed mathematical models are verified with experiments. Calculated currents of stator windings from mathematical models are used as input data in numerical models of the Motors analyzed with Finite Element Method (FEM). Magnetic flux density in cross section of the Motors is calculated from numerical Motor models under different operating regimes. Parts of magnetic cores with high flux density are discovered and construction of the Motors is further improved by applying soft magnetic powders.
Koichiro Sawa - One of the best experts on this subject based on the ideXlab platform.
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A Study on the Electric and Magnetic Circuit of Single Phase Line Start Permanent Magnet Motor
IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics, 2006Co-Authors: Eiko Nakayama, Koichiro SawaAbstract:Recently, as the request of improvement on efficiency for the household appliances increases, a single-phase line-start permanent-magnet synchronous Motor (LSPM) attracts attention. LSPM has the Capacitor connected in series with the auxiliary winding and the main winding is connected in parallel with it. For this reason, the elliptic rotating magnetic field is generated by converting single-phase into quasi-two-phase. Because of the negative-sequence component in a Capacitor Motor, secondary current flows also in steady state. So its numerical analysis is difficult in comparison with three-phase Motors. Though analytical methods of starting and synchronous characteristics have been established, the effect of considering squirrel cage into analysis has yet to be discussed. In this paper, the analytical method of considering the positive and negative sequence phase making use of the method of symmetrical coordinates was proposed. And the experimental and analytical results are compared, and we consider the condition of high efficiency operating from them. In addition, we considered the parameter of load angle. Load angle is very important for single-phase LSPM, but few papers consider it. The load angle is measured by the prototype of single phase LSPM. © 2006 IEEE.
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A study on the electric and magnetic circuit of single phase line start permanent magnet Motor
31st Annual Conference of IEEE Industrial Electronics Society 2005. IECON 2005., 2005Co-Authors: T. Sano, Eiko Nakayama, Koichiro SawaAbstract:Recently, as the request of improvement on efficiency for the household appliances increases, a single-phase line-start permanent-magnet synchronous Motor (LSPM) attracts attention. LSPM has the Capacitor connected in series with the auxiliary winding and the main winding is connected in parallel with them. For this reason, the elliptic rotating magnetic field is generated by converting single-phase into quasi-two-phase. Because of the negative-sequence component in a Capacitor Motor, secondary current flows also in steady state. So its numerical analysis is difficult in comparison with three-phase Motors. Though analytical methods of starting and synchronous characteristics have been established, the effect of considering squirrel cage into analysis has yet to be discussed. In this paper, phaser diagrams that disregard and consider the squirrel cage are presented, and the effect of rotor cage on analytical results is discussed. © 2005 IEEE.
Ahmad Antares Adam - One of the best experts on this subject based on the ideXlab platform.
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Single Phase Inverter Circuit Based on Frequency Variation For Controlling The Speed of a Capacitor Motor
2015Co-Authors: Ahmad Antares AdamAbstract:This research is aimed to build a single phase inverter circuit as a speed controller for a single phase induction Motor which operates based on the variation of frequency. In this circuit, the variation of frequency is developed by an oscilator which work by the variation of the value ratio between a Capacitor and a resistance. The capacity of the Capacitor is choosen constant while the value of the resistence is varied by a potentiometer. The performance of this circuit is then examined to drive a single phase induction Motor Capacitor start and run tipe in no load and loaded conditions. The result showed that this inverter circuit can control the speeds of the Capacitor Motor proportionally to the stator voltage frequencies. The others Motor quantities such as Motor voltage, current, power, and slip also observed in this study. The result showed that the other Motor quantities namely Motor voltage, current, power also increased as the Motor frequency is increased. Keywords: single-phase, inverter-circuit, frequency, oscilator, Capacitor-Motor.
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RANGKAIAN INVERTER SATU FASA BERDASARKAN PERUBAHAN FREKUENSI UNTUK PENGENDALIAN KECEPATAN Motor KAPASITOR Single Phase Inverter Circuit Based on Frequency Variation For Controlling The Speed of a Capacitor Motor
2015Co-Authors: Ahmad Antares AdamAbstract:This research is aimed to build a single phase inverter circuit as a speed controller for a single phase induction Motor which operates based on the variation of frequency. In this circuit, the variation of frequency is developed by an oscilator which work by the variation of the value ratio between a Capacitor and a resistance. The capacity of the Capacitor is choosen constant while the value of the resistence is varied by a potentiometer. The performance of this circuit is then examined to drive a single phase induction Motor Capacitor start and run tipe in no load and loaded conditions. The result showed that this inverter circuit can control the speeds of the Capacitor Motor proportionally to the stator voltage frequencies. The others Motor quantities such as Motor voltage, current, power, and slip also observed in this study. The result showed that the other Motor quantities namely Motor voltage, current, power also increased as the Motor frequency is increased.
Rini Nur Hasanah - One of the best experts on this subject based on the ideXlab platform.
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Loading Performances of Low-Power Low-Speed Single-Phase Induction Generator with Energy Saving Lamps
Applied Mechanics and Materials, 2015Co-Authors: Hari Santoso, Rini Nur Hasanah, I.n.g. Wardana, Budiono MismailAbstract:The increasing use of energy saving lamps provides additional benefits to the application of low-power low-speed self-excited induction generators resulted from Capacitor Motor modification. Reactive power requirement of the generator can be provided from the capacitive nature of the lamps, while at the same time it is delivering active power to loads. Any loading change will automatically increase or reduce reactive power supply to generator. Results of experiments show that low-power low-speed single-phase self-excited induction generator is more robust and suitable for this kind of loads. Generator does not lose its voltage when experiencing abrupt change of loads. This robustness makes the generator suitable for the use in low-capacity hydropower generation in remote areas being commonly not covered by national electricity grid.
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Capacitor Motor as Low-Power, Low-Speed Single-Phase Generator
2014Co-Authors: Hari Santoso, Rini Nur Hasanah, Budiono Mismail, I Nyoman Gde WardanaAbstract:In this paper, some results of experiment on modification of induction Motor into generator are described. Not as usually done on three-phase Motor, the modification has been done on Capacitor Motors normally supplied with single-phase source. The resulted induction generator should be able to self-excite and has been intended for low-power, low-speed applications. These applications are prospective for example in rural renewable energy generations and as Motors for some special electric vehicles. Machine modification instead of total design-production or new machine acquisition is considered more appropriate for remote rural electrification. Distance and transportation difficulties, unavailability of nearby machine industry, lack of human resources with ‘high-tech savvy’, besides the low purchasing power of population in remote rural areas are some reasons behind the consideration. Experiment results indicated that voltage generation up to nominal value is not always easy to attain in a Capacitor Motor, even when functioning beyond its synchronous speed. An additional pre-charged Capacitor should be used to initiate voltage generation. During start-up, load and the pre-charged Capacitor had to be removed from generator to avoid Capacitor discharge. Load could then be added gradually once generator approached its nominal output value. It was also shown that in order to generate power the generator must be rotating over its synchronous speed. The resulted frequency values did not vary linearly to the rotation speed and the obtained efficiency was still low.
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A contribution to energy saving in induction Motors
2005Co-Authors: Rini Nur HasanahAbstract:Electric Motors consume over half of the electrical energy produced by power stations, almost the three-quarters of the electrical consumption in industry and almost the half of commercial electrical consumption in developed countries. Motors are by far the most important type of electric charges, and so constitute the main targets to achieve energy saving. Owing to their simple and robust construction, the asynchronous Motors and especially those of squirrel-cage types, represent about 90-95% of the electrical energy consumption of electric Motors, which is equivalent to about 53% of total electrical energy consumption. They are widely used as electrical drives in industrial, commercial, public service, traction and domestic applications. Owing to the importance of induction Motors, this thesis is aimed at contributing to energy saving efforts, more specifically in the field of low power induction Motors. A contribution is kept in perspective by taking into consideration the energy saving potential during the Motor design stage as well as during its operation. Every effort to save energy in Motor application can be made by always attempting to use energy only as much as what needed during its operation. The best way is to exploit the saving potential during Motor design, while at the same time taking into account its intended application. It can be achieved either through the improvement of Motor design or through the reduction of its input electrical energy when the Motor has already been built. These two efforts are studied, elaborated and worked out thoroughly in this thesis. To attain this objective, a synthesis has been started with the description of how to model an induction Motor. To obtain a better model, an improvement is proposed by using the Schwarz-Christoffel mapping to calculate the slot leakage inductance in induction Motor. With such method, slot-leakage inductance can be determined more precisely, resulting in more accurate prediction of Motor characteristics. It is based on the stored magnetic energy calculation using two-directional field distribution in the slot. The air gap influence can be observed easily, so that a reasonable slot leakage definition can be adopted. Unlike the conventional method, which is only suitable for rectangular slots (otherwise empirical corrections are required), the proposed general slot form can be extended to any desired polygonal slot form. Consideration of saturation is also indispensable because ignoring it could result in inaccuracy in Motor performance prediction. Considering the saturation is essential owing to its important role in self-excitation phenomenon to establish voltage build-up in induction generator. However, the self-excitation phenomenon is undesirable in certain group of Capacitor Motors as it may hinder the switching-off process and mechanical braking at a desired moment. The undesirable switching-off failure condition is to be avoided by properly designing the Capacitor Motor. Like in this Capacitor Motor special application, where a proper design is useful from the point of view of operation safety, designing properly a Motor is also very important in energy saving efforts. Motor design and optimization to minimize losses as well as to make possible wide speed-range Motor operation are some of the efforts. However, when induction Motor has already been built, saving energy is only possible by managing its supplying electrical energy. Various strategies are possible and a particular emphasis on the use of triac to reduce Motor input voltage is presented. Besides, a brief economic saving evaluation is given to draw attention to the energy saving potential.
Budiono Mismail - One of the best experts on this subject based on the ideXlab platform.
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Loading Performances of Low-Power Low-Speed Single-Phase Induction Generator with Energy Saving Lamps
Applied Mechanics and Materials, 2015Co-Authors: Hari Santoso, Rini Nur Hasanah, I.n.g. Wardana, Budiono MismailAbstract:The increasing use of energy saving lamps provides additional benefits to the application of low-power low-speed self-excited induction generators resulted from Capacitor Motor modification. Reactive power requirement of the generator can be provided from the capacitive nature of the lamps, while at the same time it is delivering active power to loads. Any loading change will automatically increase or reduce reactive power supply to generator. Results of experiments show that low-power low-speed single-phase self-excited induction generator is more robust and suitable for this kind of loads. Generator does not lose its voltage when experiencing abrupt change of loads. This robustness makes the generator suitable for the use in low-capacity hydropower generation in remote areas being commonly not covered by national electricity grid.
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Capacitor Motor as Low-Power, Low-Speed Single-Phase Generator
2014Co-Authors: Hari Santoso, Rini Nur Hasanah, Budiono Mismail, I Nyoman Gde WardanaAbstract:In this paper, some results of experiment on modification of induction Motor into generator are described. Not as usually done on three-phase Motor, the modification has been done on Capacitor Motors normally supplied with single-phase source. The resulted induction generator should be able to self-excite and has been intended for low-power, low-speed applications. These applications are prospective for example in rural renewable energy generations and as Motors for some special electric vehicles. Machine modification instead of total design-production or new machine acquisition is considered more appropriate for remote rural electrification. Distance and transportation difficulties, unavailability of nearby machine industry, lack of human resources with ‘high-tech savvy’, besides the low purchasing power of population in remote rural areas are some reasons behind the consideration. Experiment results indicated that voltage generation up to nominal value is not always easy to attain in a Capacitor Motor, even when functioning beyond its synchronous speed. An additional pre-charged Capacitor should be used to initiate voltage generation. During start-up, load and the pre-charged Capacitor had to be removed from generator to avoid Capacitor discharge. Load could then be added gradually once generator approached its nominal output value. It was also shown that in order to generate power the generator must be rotating over its synchronous speed. The resulted frequency values did not vary linearly to the rotation speed and the obtained efficiency was still low.
