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Vladimir Dmitrievskii
Department of Electrical Engineering, Ural Federal University, 620002 Yekaterinburg, Russia

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Journal article
Published: 29 June 2021 in Water
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The paper discusses the use of the combined control for a system of two parallel pumps to increase its service life. Using the combined control, the pumping system is controlled together by change the speed, throttling, and bypass. The power consumption of the pumping system is calculated for three methods of flow control: with minimum energy consumption, with maximum reliability, and control with a trade-off between efficiency and reliability. In the case of control with maximum reliability, the energy consumption of the pumping system is higher than in the case of control with minimum energy consumption by 29.2%. In the case of the proposed trade-off control, which provides acceptable reliability, the power consumption is higher than with the minimum energy consumption control by only 7.3%.

ACS Style

Safarbek Oshurbekov; Vadim Kazakbaev; Vladimir Prakht; Vladimir Dmitrievskii. Increasing Service Life and System Efficiency of Parallel Pumps Using Combined Pump Regulation. Water 2021, 13, 1808 .

AMA Style

Safarbek Oshurbekov, Vadim Kazakbaev, Vladimir Prakht, Vladimir Dmitrievskii. Increasing Service Life and System Efficiency of Parallel Pumps Using Combined Pump Regulation. Water. 2021; 13 (13):1808.

Chicago/Turabian Style

Safarbek Oshurbekov; Vadim Kazakbaev; Vladimir Prakht; Vladimir Dmitrievskii. 2021. "Increasing Service Life and System Efficiency of Parallel Pumps Using Combined Pump Regulation." Water 13, no. 13: 1808.

Journal article
Published: 11 June 2021 in Mathematics
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Synchronous homopolar motors (SHMs) have been attracting the attention of researchers for many decades. They are used in a variety of equipment such as aircraft and train generators, welding inverters, and as traction motors. Various mathematical models of SHMs have been proposed to deal with their complicated magnetic circuit. However, mathematical techniques for optimizing SHMs have not yet been proposed. This paper discusses various aspects of the optimal design of traction SHMs, applying the one-criterion unconstrained Nelder–Mead method. The considered motor is intended for use in a mining dump truck with a carrying capacity of 90 tons. The objective function for the SHM optimization was designed to reduce/improve the following main characteristics: total motor power loss, maximum winding current, and torque ripple. One of the difficulties in optimizing SHMs is the three-dimensional structure of their magnetic core, which usually requires the use of a three-dimensional finite element model. However, in this study, an original two-dimensional finite element model of a SHM was used; it allowed the drastic reduction in the computational burden, enabling objective optimization. As a result of optimization, the total losses in the motor decreased by up to 1.16 times and the torque ripple decreased by up to 1.34 times; the maximum armature winding current in the motor mode decreased by 8%.

ACS Style

Vladimir Dmitrievskii; Vladimir Prakht; Alecksey Anuchin; Vadim Kazakbaev. Design Optimization of a Traction Synchronous Homopolar Motor. Mathematics 2021, 9, 1352 .

AMA Style

Vladimir Dmitrievskii, Vladimir Prakht, Alecksey Anuchin, Vadim Kazakbaev. Design Optimization of a Traction Synchronous Homopolar Motor. Mathematics. 2021; 9 (12):1352.

Chicago/Turabian Style

Vladimir Dmitrievskii; Vladimir Prakht; Alecksey Anuchin; Vadim Kazakbaev. 2021. "Design Optimization of a Traction Synchronous Homopolar Motor." Mathematics 9, no. 12: 1352.

Journal article
Published: 05 June 2021 in Mathematics
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Reliability, along with energy efficiency, is an important characteristic of pump units in various applications. In practical pump applications, it is important to strike a balance between reliability and energy efficiency. These indicators strongly depend on the applied control method of the pump unit. This study analyzes a trade-off method for regulating a system with three parallel pumps equipped with only one frequency converter (multi-pump single-drive system). A typical operating cycle of a pumping system with variable flow rate requirements is considered. The proposed trade-off method is compared with the traditional regulation, when a change in the operating point of the pump is achieved only by changing the rotation speed, and with the method for maximum reliability. It is shown that the proposed trade-off method makes it possible to ensure sufficient reliability of the multi-pump system operation without a significant increase in energy consumption.

ACS Style

Safarbek Oshurbekov; Vadim Kazakbaev; Vladimir Prakht; Vladimir Dmitrievskii. Improving Reliability and Energy Efficiency of Three Parallel Pumps by Selecting Trade-Off Operating Points. Mathematics 2021, 9, 1297 .

AMA Style

Safarbek Oshurbekov, Vadim Kazakbaev, Vladimir Prakht, Vladimir Dmitrievskii. Improving Reliability and Energy Efficiency of Three Parallel Pumps by Selecting Trade-Off Operating Points. Mathematics. 2021; 9 (11):1297.

Chicago/Turabian Style

Safarbek Oshurbekov; Vadim Kazakbaev; Vladimir Prakht; Vladimir Dmitrievskii. 2021. "Improving Reliability and Energy Efficiency of Three Parallel Pumps by Selecting Trade-Off Operating Points." Mathematics 9, no. 11: 1297.

Journal article
Published: 29 March 2021 in Mathematics
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The permanent magnet flux-switching machine (PMFSM) is one of the most promising machines with magnets inserted into the stator. To determine in which applications the use of PMFSM is promising, it is essential to compare the PMFSM with machines of other types. This study provides a theoretical comparison of the PMFSM with a conventional interior permanent magnet synchronous machine (IPMSM) in the gearless generator of a low-power wind turbine (332 rpm, 51.4 Nm). To provide a fair comparison, both machines are optimized using the Nelder–Mead algorithm. The minimized optimization objectives are the required power of frequency converter, cost of active materials, torque ripple and losses of a generator averaged over the working profile of the wind turbine. In order to reduce the computational time, the substituting profile method is applied. Based on the results of the calculations, the advantages and disadvantages of the considered machines were revealed: the IPMSM has significantly lower losses and higher efficiency than the PMFSM, and the PMFSM requires much less rare-earth magnets and copper and is, therefore, cheaper in mass production.

ACS Style

Vladimir Prakht; Vladimir Dmitrievskii; Vadim Kazakbaev; Ekaterina Andriushchenko. Comparison of Flux-Switching and Interior Permanent Magnet Synchronous Generators for Direct-Driven Wind Applications Based on Nelder–Mead Optimal Designing. Mathematics 2021, 9, 732 .

AMA Style

Vladimir Prakht, Vladimir Dmitrievskii, Vadim Kazakbaev, Ekaterina Andriushchenko. Comparison of Flux-Switching and Interior Permanent Magnet Synchronous Generators for Direct-Driven Wind Applications Based on Nelder–Mead Optimal Designing. Mathematics. 2021; 9 (7):732.

Chicago/Turabian Style

Vladimir Prakht; Vladimir Dmitrievskii; Vadim Kazakbaev; Ekaterina Andriushchenko. 2021. "Comparison of Flux-Switching and Interior Permanent Magnet Synchronous Generators for Direct-Driven Wind Applications Based on Nelder–Mead Optimal Designing." Mathematics 9, no. 7: 732.

Journal article
Published: 23 February 2021 in Electrical Engineering & Electromechanics
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Aim. The comparative analysis of energy consumption, electricity costs during lifetime cycle and payback period of a pump unit with 90 kW 2-pole induction motors, belonging to various energy efficiency classes, feeding directly from power grid. Methods. The examined operating modes aligned with a typical operating cycle of a pump unit with approximately constant flow rate of 75-110 % of the rated flow. The calculations were based on the pump and induction motors nameplate data, which, in their turn, were based on the manufacturers’ experimental data. Results. The calculations of energy consumption, electricity costs and payback periods of a pump unit with 90 kW 2-pole induction motors, feeding directly from power grid have been performed in the article. The application of induction motors belonging to IE2, IE3 and IE4 energy efficiency classes has been discussed. Practical value. It has been demonstrated, than in case of replacement of an induction motor of energy efficiency class IE2 due to planned retrofit, payback period for an IE4 induction motor is 2.18 years, energy savings within a calculated 20-year operating period are 268MW·h, which makes €41110 in money terms. Under the same conditions, the replacement of an induction motor of energy efficiency class IE2 with an induction motor of energy efficiency class IE3 will allow to save 88 MW·h within a calculated operating period, which, expressed in monetary terms, is €13500 and the payback period is 5.11 years. Thus, the article proves that despite a higher initial price, the choice of an induction motor of energy efficiency class IE4 tends to be more economically advantageous.

ACS Style

V.V. Goman; V.A. Prakht; V.M. Kazakbaev; V.A. Dmitrievskii; E.A. Valeev; A.S. Paramonov. Analysis of the payback period of a modernized pump unit with induction electric motors of advanced energy efficiency classes. Electrical Engineering & Electromechanics 2021, 15 -19.

AMA Style

V.V. Goman, V.A. Prakht, V.M. Kazakbaev, V.A. Dmitrievskii, E.A. Valeev, A.S. Paramonov. Analysis of the payback period of a modernized pump unit with induction electric motors of advanced energy efficiency classes. Electrical Engineering & Electromechanics. 2021; (1):15-19.

Chicago/Turabian Style

V.V. Goman; V.A. Prakht; V.M. Kazakbaev; V.A. Dmitrievskii; E.A. Valeev; A.S. Paramonov. 2021. "Analysis of the payback period of a modernized pump unit with induction electric motors of advanced energy efficiency classes." Electrical Engineering & Electromechanics , no. 1: 15-19.

Journal article
Published: 28 January 2021 in Mathematics
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Single-phase flux reversal motors (FRMs) with sintered rare-earth permanent magnets on the stator for low-cost high-speed applications have a reliable rotor and a good specific power. However, to reduce eddy current loss, the sintered rare-earth magnets on the stator have to be segmented into several pieces and their cost increases with the number of magnet segments. An alternative to the sintered magnets can be bonded magnets, in which eddy current loss is almost absent. The remanence of bonded magnets is lower than that of sintered magnets, and they are prone to demagnetization. However, the cost of low-power motors with bonded magnets can be lower because of the simpler manufacturing technology and the lower material cost. This paper discusses various aspects of the optimal design of FRM with bonded magnets, applying the Nelder–Mead method. An objective function for optimizing an FRM with bonded magnets is designed to ensure the required efficiency, reduce torque oscillations, and prevent the bonded magnets from demagnetizing. As a result, it is shown that the FRM with bonded magnets has approximately the same efficiency as the FRM with sintered magnets. In addition, the peak-to-peak torque ripple is minimized and the minimal instantaneous torque is maximized.

ACS Style

Vladimir Prakht; Vladimir Dmitrievskii; Vadim Kazakbaev. Optimal Design of a High-Speed Flux Reversal Motor with Bonded Rare-Earth Permanent Magnets. Mathematics 2021, 9, 256 .

AMA Style

Vladimir Prakht, Vladimir Dmitrievskii, Vadim Kazakbaev. Optimal Design of a High-Speed Flux Reversal Motor with Bonded Rare-Earth Permanent Magnets. Mathematics. 2021; 9 (3):256.

Chicago/Turabian Style

Vladimir Prakht; Vladimir Dmitrievskii; Vadim Kazakbaev. 2021. "Optimal Design of a High-Speed Flux Reversal Motor with Bonded Rare-Earth Permanent Magnets." Mathematics 9, no. 3: 256.

Conference paper
Published: 27 January 2021 in 2021 28th International Workshop on Electric Drives: Improving Reliability of Electric Drives (IWED)
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The paper describes the implementation of a combined pump control strategy in order to increase its reliability and service life. With the help of combined control, the flow rate is controlled simultaneously by rotational speed variation, throttling, and bypass. The energy consumption of the pump unit is evaluated, and the reliability of its operation is examined according to three various flow rate control methods that are applied: with minimum energy consumption, with maximum reliability (service life), and a method that provides a trade-off between energy consumption and service life. Comparison of energy consumption in the considered cases shows that with the trade-off regulation method, energy consumption is 6.36% higher than with the help of the minimum energy consumption control. However, the combined control method allows achieving significant energy savings up to (20.6 % ) in comparison with the maximum reliability control method.

ACS Style

Safarbek Oshurbekov; Vadim Kazakbaev; Vladimir Prakht; Vladimir Dmitrievskii; Levon Gevorkov. Extending Pump Unit Service Life Using Combined Pump Control. 2021 28th International Workshop on Electric Drives: Improving Reliability of Electric Drives (IWED) 2021, 1 -6.

AMA Style

Safarbek Oshurbekov, Vadim Kazakbaev, Vladimir Prakht, Vladimir Dmitrievskii, Levon Gevorkov. Extending Pump Unit Service Life Using Combined Pump Control. 2021 28th International Workshop on Electric Drives: Improving Reliability of Electric Drives (IWED). 2021; ():1-6.

Chicago/Turabian Style

Safarbek Oshurbekov; Vadim Kazakbaev; Vladimir Prakht; Vladimir Dmitrievskii; Levon Gevorkov. 2021. "Extending Pump Unit Service Life Using Combined Pump Control." 2021 28th International Workshop on Electric Drives: Improving Reliability of Electric Drives (IWED) , no. : 1-6.

Journal article
Published: 09 December 2020 in Applied Sciences
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The energy efficiency of a multi-pump system consisting of two low-power (0.75 kW) pumps operating in parallel mode and a single-pump mechanism (1.5 kW) is compared in this study. For this purpose, mathematical models, experimental data, and data retrieved from the manuals provided by the pump manufacturers are used. The single-pump system is fed by a single variable speed drive. A multi-pump system running in parallel mode consists of two pumps. One of them is driven by an induction motor connected directly to the electrical grid and equipped with a throttle. Another pump is actuated by an induction motor fed by a variable speed drive. The flowrate of the liquid in the multi-pump is controlled with the help of speed variation and throttling. In the case of the single-pump system the conventional speed control method is applied during the analysis. For both pump system topologies, the daily and annual energy consumption is obtained. As a result of conducted calculations, it was shown that the multi-pump provides 29.8% savings in comparison to the single-pump system in the case of a typical flowrate profile.

ACS Style

Safarbek Oshurbekov; Vadim Kazakbaev; Vladimir Prakht; Vladimir Dmitrievskii; Levon Gevorkov. Energy Consumption Comparison of a Single Variable-Speed Pump and a System of Two Pumps: Variable-Speed and Fixed-Speed. Applied Sciences 2020, 10, 8820 .

AMA Style

Safarbek Oshurbekov, Vadim Kazakbaev, Vladimir Prakht, Vladimir Dmitrievskii, Levon Gevorkov. Energy Consumption Comparison of a Single Variable-Speed Pump and a System of Two Pumps: Variable-Speed and Fixed-Speed. Applied Sciences. 2020; 10 (24):8820.

Chicago/Turabian Style

Safarbek Oshurbekov; Vadim Kazakbaev; Vladimir Prakht; Vladimir Dmitrievskii; Levon Gevorkov. 2020. "Energy Consumption Comparison of a Single Variable-Speed Pump and a System of Two Pumps: Variable-Speed and Fixed-Speed." Applied Sciences 10, no. 24: 8820.

Journal article
Published: 29 November 2020 in Applied Sciences
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The high energy intensity of the modern industry and the threat of climate change determine the high urgency of increasing the energy efficiency of electric motors. In this paper, energy consumption, energy costs, payback periods, and CO2 emissions of 75 kW, 4 pole induction motors with direct grid supply in a fixed-speed pump unit are evaluated. Motors of the IE2, IE3, and IE4 efficiency classes according to IEC 60034-30-1 standard are compared in terms of life-time energy savings, payback period, and CO2 emissions. To carry out the analysis, polynomial interpolation of the data from the available manufacturer datasheets of the motors is used. It concluded that even though the initial investment cost of the IE4-motor is higher than that of IE3-motor, the IE4-motor is more profitable if more than 3 years of operation are considered and also provides significant reductions of CO2 emissions. The paper presents a calculation method of the aforementioned indicators which can be useful for companies, researchers, and engineers for quick assessment and selection of technical solutions.

ACS Style

Victor Goman; Vladimir Prakht; Vadim Kazakbaev; Vladimir Dmitrievskii. Comparative Study of Induction Motors of IE2, IE3 and IE4 Efficiency Classes in Pump Applications Taking into Account CO2 Emission Intensity. Applied Sciences 2020, 10, 8536 .

AMA Style

Victor Goman, Vladimir Prakht, Vadim Kazakbaev, Vladimir Dmitrievskii. Comparative Study of Induction Motors of IE2, IE3 and IE4 Efficiency Classes in Pump Applications Taking into Account CO2 Emission Intensity. Applied Sciences. 2020; 10 (23):8536.

Chicago/Turabian Style

Victor Goman; Vladimir Prakht; Vadim Kazakbaev; Vladimir Dmitrievskii. 2020. "Comparative Study of Induction Motors of IE2, IE3 and IE4 Efficiency Classes in Pump Applications Taking into Account CO2 Emission Intensity." Applied Sciences 10, no. 23: 8536.

Journal article
Published: 16 November 2020 in Applied Sciences
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The high energy intensity of the modern industry determines the high urgency of increasing the energy efficiency of production processes. However, a big number of motor types of enhanced efficiency classes are available on the market. The motor users can be confused about the choice of the right motor solution for a certain application. In this paper, to help with this choice the energy efficiency indicators of various types of electric motors in a low-power pump unit with a constant rotation speed are studied. Moreover, not only power losses in the motor are considered, but also power losses in the cable and transformer, which are influenced by the power factor of the motor. Induction motors (IMs) and synchronous motors powered directly from the grid (direct-on-line synchronous motor with permanent magnet in the rotor, DOL PMSM; direct-on-line synchronous reluctance motor without permanent magnet, DOL SynRM) of IE2, IE3, and IE4 energy efficiency classes are compared. To carry out the analysis, polynomial interpolation of the available catalogue data and experimental data of the motors are used. The main criteria for comparing different motors in this work are the energy savings over the pump’s life cycle and the payback period when replacing an IE2 motor with a motor of a higher energy efficiency class. The article shows that although the DOL PMSM has a lower motor efficiency than the DOL SynRM, it saves more energy due to its higher power factor, which reduces cable and transformer losses. It is also shown that, despite the highest initial cost, when taking into account cable and transformer losses, the payback period of DOL PMSM can be shorter than that of IE3 and IE4 induction motors. DOL SynRM has the shortest payback period in all considered cases, has no troublesome rare-earth permanent magnets, and can also be a valuable solution.

ACS Style

Vadim Kazakbaev; Vladimir Prakht; Vladimir Dmitrievskii; Dmitry Golovanov. Feasibility Study of Pump Units with Various Direct-On-Line Electric Motors Considering Cable and Transformer Losses. Applied Sciences 2020, 10, 8120 .

AMA Style

Vadim Kazakbaev, Vladimir Prakht, Vladimir Dmitrievskii, Dmitry Golovanov. Feasibility Study of Pump Units with Various Direct-On-Line Electric Motors Considering Cable and Transformer Losses. Applied Sciences. 2020; 10 (22):8120.

Chicago/Turabian Style

Vadim Kazakbaev; Vladimir Prakht; Vladimir Dmitrievskii; Dmitry Golovanov. 2020. "Feasibility Study of Pump Units with Various Direct-On-Line Electric Motors Considering Cable and Transformer Losses." Applied Sciences 10, no. 22: 8120.

Journal article
Published: 31 August 2020 in Applied Sciences
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Single-phase motors are used in low-power, cost-effective, variable-speed applications. As a replacement to traditional single-phase synchronous motors with magnets on the rotor, single-phase flux reversal motors (FRMs) with a rugged and reliable toothed rotor are considered for the high-speed applications. However, torque pulsations of single-phase motors are high. The aim of this work is to minimize the torque ripple and increase its minimum instantaneous value, as well as to reduce FRM losses. To solve this problem, an asymmetric rotor is used, and an objective function is proposed, which includes parameters characterizing the pulsations of the torque and the loss of FRM for two load conditions. To optimize the single-phase FRM and minimize the objective function, the Nelder–Mead method was applied. The optimization criterion was selected to maximize the efficiency, to reduce the torque ripple, and to the avoid the negative torque in a wide range of powers at the fan load (quadric dependence of torque on speed). Two operating loading modes are considered. After two stages of optimization, the peak-to-peak torque ripple in the FRM in the rated loading mode decreased by 1.7 times, and in the mode with reduced load by 2.7 times. In addition, in the FRM before optimization, the torque has sections with negative values, and in the FRM after optimization, the torque is positive over the entire period. Although losses in the rated mode increased by 4%, when underloaded, they decreased by 11%, which creates an additional advantage for applications that work most of the time with underload.

ACS Style

Vladimir Dmitrievskii; Vladimir Prakht; Vadim Kazakbaev; Dmitry Golovanov. Optimum Design of High-Speed Single-Phase Flux Reversal Motor with Reduced Torque Ripple. Applied Sciences 2020, 10, 6024 .

AMA Style

Vladimir Dmitrievskii, Vladimir Prakht, Vadim Kazakbaev, Dmitry Golovanov. Optimum Design of High-Speed Single-Phase Flux Reversal Motor with Reduced Torque Ripple. Applied Sciences. 2020; 10 (17):6024.

Chicago/Turabian Style

Vladimir Dmitrievskii; Vladimir Prakht; Vadim Kazakbaev; Dmitry Golovanov. 2020. "Optimum Design of High-Speed Single-Phase Flux Reversal Motor with Reduced Torque Ripple." Applied Sciences 10, no. 17: 6024.

Journal article
Published: 09 July 2020 in Energies
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The paper presents a comparative analysis of life-cycle energy consumption for three different types of 4 kW line-start motors used in a pump unit with throttling: the most widely used induction motor with IE3 efficiency class, line start permanent magnet synchronous motor with IE4 efficiency class and line start synchronous reluctance motor with IE4 efficiency class. The operating cycle for pump units with constant flow is considered for the above-mentioned types of motors taking into account not only the losses in the pump and motor, but also in the power supply cable. It is shown that the line start synchronous reluctance motor without magnets has the highest efficiency over the entire considered loading range. However, its power factor is lower than that of the synchronous motor with magnets and therefore it has more significant losses in power supply cable. Despite this disadvantage, the line-start reluctance motor is a good alternative to widespread induction motor since it allows saving of approximately 4000 euro more than the latter during the 20 years life cycle. It also provides similar savings in comparison to the permanent magnet synchronous motor, but unlike it, it does not have costly rare-earth materials in the rotor.

ACS Style

Vadim Kazakbaev; Vladimir Prakht; Vladimir Dmitrievskii; Safarbek Oshurbekov; Dmitry Golovanov. Life Cycle Energy Cost Assessment for Pump Units with Various Types of Line-Start Operating Motors Including Cable Losses. Energies 2020, 13, 3546 .

AMA Style

Vadim Kazakbaev, Vladimir Prakht, Vladimir Dmitrievskii, Safarbek Oshurbekov, Dmitry Golovanov. Life Cycle Energy Cost Assessment for Pump Units with Various Types of Line-Start Operating Motors Including Cable Losses. Energies. 2020; 13 (14):3546.

Chicago/Turabian Style

Vadim Kazakbaev; Vladimir Prakht; Vladimir Dmitrievskii; Safarbek Oshurbekov; Dmitry Golovanov. 2020. "Life Cycle Energy Cost Assessment for Pump Units with Various Types of Line-Start Operating Motors Including Cable Losses." Energies 13, no. 14: 3546.

Journal article
Published: 06 February 2020 in Mathematics
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In this paper, the optimal design of the Flux-Switching Generator with ferrite magnets based on a two-mode substituting load profile for a gearless wind generator is considered. A one-criterion Nelder-Mead method is used to optimize the generator design. The optimization function is constructed mainly so as to minimize the average losses in the generator and the required AC–DC converter power. Also, the Flux-Switching Generator torque-ripple and the ferrite magnets volume are minimized. Using substituting profiles instead of initial ones reduces the calculation efforts substantially. The paper contains the analysis of the optimal design of the Flux-Switching Generator with ferrite magnets.

ACS Style

Vladimir Prakht; Vladimir Dmitrievskii; Vadim Kazakbaev. Optimal Design of Gearless Flux-Switching Generator with Ferrite Permanent Magnets. Mathematics 2020, 8, 206 .

AMA Style

Vladimir Prakht, Vladimir Dmitrievskii, Vadim Kazakbaev. Optimal Design of Gearless Flux-Switching Generator with Ferrite Permanent Magnets. Mathematics. 2020; 8 (2):206.

Chicago/Turabian Style

Vladimir Prakht; Vladimir Dmitrievskii; Vadim Kazakbaev. 2020. "Optimal Design of Gearless Flux-Switching Generator with Ferrite Permanent Magnets." Mathematics 8, no. 2: 206.

Journal article
Published: 04 December 2019 in Applied Sciences
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The paper presents a comparative analysis of energy consumption by 2.2 kW electric motors of various types and energy efficiency classes in the electric drive of a pump unit with throttle control in a water supply system. Line-start permanent-magnet synchronous motors of the IE4 energy efficiency class and induction motors of the IE4 and IE3 energy efficiency classes of various manufacturers were considered (IE4 and IE3 are labels of energy efficiency classes of electric motors according to IEC 60034-30-1 standard). Energy consumption at a hydraulic load changing under a typical duty cycle was calculated based on the nameplate data of the pump and electric motors. The developed method shows that selecting an electric motor based on the IE energy efficiency class under the IEC 60034-30-1 standard (i.e., based on efficiency at a rated load) may not provide the minimum energy consumption of a variable flow pump unit over a typical duty cycle. In particular, the considered IE4 class line-start permanent-magnet synchronous motors do not provide significant advantages over IE4 class induction motors, and sometimes even over IE3 class induction motors when they are used in variable flow pump units.

ACS Style

Victor Goman; Safarbek Oshurbekov; Vadim Kazakbaev; Vladimir Prakht; Vladimir Dmitrievskii. Energy Efficiency Analysis of Fixed-Speed Pump Drives with Various Types of Motors. Applied Sciences 2019, 9, 5295 .

AMA Style

Victor Goman, Safarbek Oshurbekov, Vadim Kazakbaev, Vladimir Prakht, Vladimir Dmitrievskii. Energy Efficiency Analysis of Fixed-Speed Pump Drives with Various Types of Motors. Applied Sciences. 2019; 9 (24):5295.

Chicago/Turabian Style

Victor Goman; Safarbek Oshurbekov; Vadim Kazakbaev; Vladimir Prakht; Vladimir Dmitrievskii. 2019. "Energy Efficiency Analysis of Fixed-Speed Pump Drives with Various Types of Motors." Applied Sciences 9, no. 24: 5295.

Journal article
Published: 24 September 2019 in Energies
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Due to the increasing need for direct-drive wind turbines, a large number of papers are dedicated to the optimization of low-speed wind generators. A permanent-magnet flux-switching machine can be a valuable option to use in such applications. This paper describes the optimization procedure of a direct-drive flux-switching wind generator. The average losses, the required converter power, and the cost of permanents magnets were chosen as the optimization objectives. To reduce the calculation efforts during the optimization, a method to construct the substituting load profiles is proposed. Two-mode and three-mode substituting profiles were constructed on the basis of the nine-mode initial profile. The losses calculated under the two-mode, three-mode, and nine-mode profiles accurately coincided, which supported the use of the low-mode substituting profiles instead of the initial one. During the optimization, the average losses decreased by 30%, which corresponded to an increase in the average efficiency by almost 6%. The required converter power was decreased by 10%. The total active material mass, cogging torque, and torque ripple were also slightly decreased.

ACS Style

Vladimir Dmitrievskii; Vladimir Prakht; Vadim Kazakbaev. Design Optimization of a Permanent-Magnet Flux-Switching Generator for Direct-Drive Wind Turbines. Energies 2019, 12, 3636 .

AMA Style

Vladimir Dmitrievskii, Vladimir Prakht, Vadim Kazakbaev. Design Optimization of a Permanent-Magnet Flux-Switching Generator for Direct-Drive Wind Turbines. Energies. 2019; 12 (19):3636.

Chicago/Turabian Style

Vladimir Dmitrievskii; Vladimir Prakht; Vadim Kazakbaev. 2019. "Design Optimization of a Permanent-Magnet Flux-Switching Generator for Direct-Drive Wind Turbines." Energies 12, no. 19: 3636.

Journal article
Published: 12 September 2019 in Applied Sciences
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A single-phase flux reversal machine (FRM) has many advantages in high-speed applications because of its simple and reliable rotor structure without magnets or winding, simple and cheap concentrated stator windings, high efficiency, and power density. However, the major problem of single-phase motors is the high torque ripple, which shortens their lifetime and causes noise and vibrations, not only in the machine, but also in the mechanisms coupled therewith. This paper presents a novel three-phase machine consisting of three single-phase machines, having a common shaft aiming to reduce the torque ripple and to improve motor behavior. In this paper, the mathematical model of the single-phase flux reversal motor, as well as the conversion procedure of the single-phase motor parameters to the three-phase ones, is considered. Furthermore, an optimization procedure of the motor and choosing the optimization objectives are done. The finite element two-dimensional (2D) method is used to simulate the machine and to show the results.

ACS Style

Vladimir Prakht; Vladimir Dmitrievskii; Vadim Kazakbaev; Safarbek Oshurbekov; Mohamed N. Ibrahim. Optimal Design of a Novel Three-Phase High-Speed Flux Reversal Machine. Applied Sciences 2019, 9, 3822 .

AMA Style

Vladimir Prakht, Vladimir Dmitrievskii, Vadim Kazakbaev, Safarbek Oshurbekov, Mohamed N. Ibrahim. Optimal Design of a Novel Three-Phase High-Speed Flux Reversal Machine. Applied Sciences. 2019; 9 (18):3822.

Chicago/Turabian Style

Vladimir Prakht; Vladimir Dmitrievskii; Vadim Kazakbaev; Safarbek Oshurbekov; Mohamed N. Ibrahim. 2019. "Optimal Design of a Novel Three-Phase High-Speed Flux Reversal Machine." Applied Sciences 9, no. 18: 3822.

Journal article
Published: 21 June 2019 in IEEE Transactions on Industry Applications
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This paper considers an optimization of the IE5 four-pole synchronous reluctance motor of a new design. The motor has an original rotor design and a stator with a fractional-slot winding (2.5 slots per pole and phase). The target parameters of optimization are the resulting efficiency of the motor at the fan load profile, the torque ripple, the required power of the frequency converter, and the total harmonic distortion of the supply voltage. The motor efficiency is much higher than the IE5 class requirement and remains high in wide range of powers at the fan load profile. Also, the motor has low torque ripple despite that its rotor and stator have no skewing.

ACS Style

Vladimir Dmitrievskii; Vladimir Prakht; Vadim Kazakbaev. IE5 Energy-Efficiency Class Synchronous Reluctance Motor With Fractional Slot Winding. IEEE Transactions on Industry Applications 2019, 55, 4676 -4684.

AMA Style

Vladimir Dmitrievskii, Vladimir Prakht, Vadim Kazakbaev. IE5 Energy-Efficiency Class Synchronous Reluctance Motor With Fractional Slot Winding. IEEE Transactions on Industry Applications. 2019; 55 (5):4676-4684.

Chicago/Turabian Style

Vladimir Dmitrievskii; Vladimir Prakht; Vadim Kazakbaev. 2019. "IE5 Energy-Efficiency Class Synchronous Reluctance Motor With Fractional Slot Winding." IEEE Transactions on Industry Applications 55, no. 5: 4676-4684.

Journal article
Published: 29 November 2018 in Energies
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This paper describes the design of a single-phase high-speed flux reversal motor (FRM) for use in a domestic application (vacuum cleaner). This machine has a simple and reliable rotor structure, which is a significant advantage for high-speed applications. An FRM design in which the inner stator surface is entirely used allows it to decrease its volume and increase its efficiency. The mathematical modeling, based on the finite element method, and the optimal design of the high-speed single-phase FRM are described. The criterion of optimization and the selection of a proper optimization algorithm are discussed. Since the finite element method introduces a small but quasi-random error due to round-off accumulation and choosing the mesh, etc., the Nelder-Mead method, not requiring the derivatives calculation, was chosen for the optimization. The target parameter of the optimization is built for the motor efficiency when operating at different loads. Calculations show that the presented approach provides increasing motor efficiency during the optimization, particularly at underload.

ACS Style

Vladimir Dmitrievskii; Vladimir Prakht; Vadim Kazakbaev; Sergey Sarapulov. Optimal Design of a High-Speed Single-Phase Flux Reversal Motor for Vacuum Cleaners. Energies 2018, 11, 3334 .

AMA Style

Vladimir Dmitrievskii, Vladimir Prakht, Vadim Kazakbaev, Sergey Sarapulov. Optimal Design of a High-Speed Single-Phase Flux Reversal Motor for Vacuum Cleaners. Energies. 2018; 11 (12):3334.

Chicago/Turabian Style

Vladimir Dmitrievskii; Vladimir Prakht; Vadim Kazakbaev; Sergey Sarapulov. 2018. "Optimal Design of a High-Speed Single-Phase Flux Reversal Motor for Vacuum Cleaners." Energies 11, no. 12: 3334.

Conference paper
Published: 05 November 2018 in Journal of Physics: Conference Series
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Synchronous reluctance generators with ferrite magnets in the rotor (PMSynRG) are a good alternative to synchronous generators (SG) with rare-earth magnets. The comparison between a SG with rare-earth magnets and a PMSynRG with ferrite magnets of the same diameter, stack length, power and speed is given in the paper. Twice as less magnets are required for the PMSynRG with ferrite magnets than for the SG with rare-earth magnets. The cost of the ferrite magnets is 4.4 times less than of the rare earth magnets. Also, the PMSynRG with ferrite magnets has much higher efficiency than the SG. The half-integer slot number per pole and phase is chosen to achieve rather low torque ripple without skewing the rotor.

ACS Style

V Dmitrievskii; Vladimir Prakht; Vadim Kazakbaev. Synchronous reluctance generator with ferrite magnets for wind turbine. Journal of Physics: Conference Series 2018, 1102, 012041 .

AMA Style

V Dmitrievskii, Vladimir Prakht, Vadim Kazakbaev. Synchronous reluctance generator with ferrite magnets for wind turbine. Journal of Physics: Conference Series. 2018; 1102 (1):012041.

Chicago/Turabian Style

V Dmitrievskii; Vladimir Prakht; Vadim Kazakbaev. 2018. "Synchronous reluctance generator with ferrite magnets for wind turbine." Journal of Physics: Conference Series 1102, no. 1: 012041.

Conference paper
Published: 01 November 2018 in 2018 IEEE International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles & International Transportation Electrification Conference (ESARS-ITEC)
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This paper considers the design of a three-phase gearless flux reversal machine (FRM) with permanent magnets (PM) mounted on the stator. Its stator magnetic core is made of a solid soft magnetic composite material (SMC) with a slot for laying the winding in the middle. 48 magnetic poles are located on the surface of each stator tooth, while the rotor has 24 teeth. This paper describes the mathematical model and the results of the performance calculation of the three-phase SMC FRM operating in motoring mode. Finally, comparison of the SMC FRM with the characteristics of the conventional surface mounted permanent magnet machine (SM-PMSM) made of laminated steel is performed. For fair comparison, both the SMC FRM and SM-PMSM have the same outer stator diameter and approximately the same volume.

ACS Style

Vladimir Prakht; Vladimir Dmitrievskii; Vadim Kazakbaev; Dmitry Golovanov; David Gerada. Design and Mathematical Modeling of Gearless SMC Flux Reversal Motor. 2018 IEEE International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles & International Transportation Electrification Conference (ESARS-ITEC) 2018, 1 -6.

AMA Style

Vladimir Prakht, Vladimir Dmitrievskii, Vadim Kazakbaev, Dmitry Golovanov, David Gerada. Design and Mathematical Modeling of Gearless SMC Flux Reversal Motor. 2018 IEEE International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles & International Transportation Electrification Conference (ESARS-ITEC). 2018; ():1-6.

Chicago/Turabian Style

Vladimir Prakht; Vladimir Dmitrievskii; Vadim Kazakbaev; Dmitry Golovanov; David Gerada. 2018. "Design and Mathematical Modeling of Gearless SMC Flux Reversal Motor." 2018 IEEE International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles & International Transportation Electrification Conference (ESARS-ITEC) , no. : 1-6.