scholarly journals Feasibility Study of Pump Units with Various Direct-On-Line Electric Motors Considering Cable and Transformer Losses

2020 ◽  
Vol 10 (22) ◽  
pp. 8120
Author(s):  
Vadim Kazakbaev ◽  
Vladimir Prakht ◽  
Vladimir Dmitrievskii ◽  
Dmitry Golovanov
Keyword(s):  
Energy Efficiency ◽  
Permanent Magnet ◽  
Power Factor ◽  
Induction Motors ◽  
High Energy ◽  
Payback Period ◽  
Electric Motors ◽  
Power Losses ◽  
High Urgency ◽  
On Line

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.

COMPARATIVE ASSESSMENT OF ENERGY EFFICIENCY OF ELECTRIC DRIVES WITH ASYNCHRONOUS ELECTRIC MOTORS AT VARIOUS CONTROL METHODS

2019 ◽  
Author(s):  
Nikolay Chuprina ◽  
Sergey Sedykh ◽  
Aleksandr Pugachev
Keyword(s):  
Energy Efficiency ◽  
Induction Motors ◽  
Comparative Assessment ◽  
Control Methods ◽  
Electric Motors ◽  
Power Losses ◽  
Electric Drives ◽  
Frequency Converters ◽  
Energy Indicators ◽  
Asynchronous Electric Motors

The main energy indicators of electric drives with inductions motors and frequency converters are given for various algorithms of scalyar control system of induction motors. The dependences of the power losses of the stator and rotor windings are obtained for various control methods, the analysis of the results is performed.

scholarly journals Comparative Study of Induction Motors of IE2, IE3 and IE4 Efficiency Classes in Pump Applications Taking into Account CO2 Emission Intensity

2020 ◽  
Vol 10 (23) ◽  
pp. 8536
Author(s):  
Victor Goman ◽  
Vladimir Prakht ◽  
Vadim Kazakbaev ◽  
Vladimir Dmitrievskii
Keyword(s):  
Co2 Emissions ◽  
Energy Savings ◽  
Induction Motors ◽  
Polynomial Interpolation ◽  
Life Time ◽  
High Energy ◽  
High Urgency ◽  
Consumption Energy ◽  
Co2 Emission Intensity ◽  
Technical Solutions

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.

scholarly journals Energy Efficiency Analysis of Fixed-Speed Pump Drives with Various Types of Motors

2019 ◽  
Vol 9 (24) ◽  
pp. 5295 ◽  
Author(s):  
Victor Goman ◽  
Safarbek Oshurbekov ◽  
Vadim Kazakbaev ◽  
Vladimir Prakht ◽  
Vladimir Dmitrievskii
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Duty Cycle ◽  
Induction Motors ◽  
Electric Motors ◽  
Pump Unit ◽  
Permanent Magnet Synchronous Motors ◽  
Variable Flow ◽  
Synchronous Motors ◽  
Flow Pump

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.

scholarly journals Study on Line-Start Permanent Magnet Assistance Synchronous Reluctance Motor for Improving Efficiency and Power Factor

Energies ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 384 ◽  
Author(s):  
Hyunwoo Kim ◽  
Yeji Park ◽  
Huai-Cong Liu ◽  
Pil-Wan Han ◽  
Ju Lee
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Permanent Magnet ◽  
Power Factor ◽  
Permanent Magnets ◽  
Electric Motors ◽  
Element Analysis ◽  
Final Model ◽  
Synchronous Reluctance Motor ◽  
Reluctance Motor

In order to improve the efficiency, a line-start synchronous reluctance motor (LS-SynRM) is studied as an alternative to an induction motor (IM). However, because of the saliency characteristic of SynRM, LS-SynRM have a limited power factor. Therefore, to improve the efficiency and power factor of electric motors, we propose a line-start permanent magnet assistance synchronous reluctance motor (LS-PMA-SynRM) with permanent magnets inserted into LS-SynRM. IM and LS-SynRM are selected as reference models, whose performances are analyzed and compared with that of LS-PMA-SynRM using a finite element analysis. The performance of LS-PMA-SynRM is analyzed considering the position and length of its permanent magnet, as well as its manufacture. The final model of LS-PMA-SynRM is designed for improving the efficiency and power factor of electric motors compared with LS-SynRM. To verify the finite element analysis (FEA) result, the final model is manufactured, experiments are conducted, and the performance of LS-PMA-SynRM is verified.

scholarly journals Induction motors with YY/D connection change for efficiency and power factor increasing at partial loads

2006 ◽  
Vol 19 (1) ◽  
pp. 85-98 ◽  
Author(s):  
Miloje Kostic ◽  
Jovan Radakovic
Keyword(s):  
Energy Efficiency ◽  
Energy Saving ◽  
Power Factor ◽  
Energy Savings ◽  
Induction Motors ◽  
Mean Value ◽  
The One ◽  
Partial Loads ◽  
Selection Of ◽  
Better Than

It is established that there exists a significant possibility for energy savings, on the basis of application of induction motors with YY/D connection change proposed in this paper, especially for power to 30 kW. In connection D (0.866Un), total losses and reactive loads are reduced to loads up to 75-85%. Benefits of such motors would be significant because more than 80% induction motors are light loaded (mean value ? 70%). In such manner one motor with two characteristics is attained, but that is better than to offer to the market two different motors, because only in exploitation it is possible to accurately select the one which is working with greater efficiency values in given conditions. However, at the motor with YY/D winding it is always possible, by selection of corresponding connection for (mean value) load measured in operation. Even, with connection change it is possible to adjust to load changes in future. Moreover, at loads ? 30%, energy saving by induction motors with YY/D connection is greater than the one using induction motors with thyristor controllers. Induction motors YY/D connection application may be economical in cases where it is not recommended to use higher costs of energy efficiency of motors.

scholarly journals Design Optimization of Secondary Element of Single-Sided Linear Induction Motors Using a Genetic Algorithm

2021 ◽  
Vol 64 (6) ◽  
pp. 505-516
Author(s):  
V. A. Prakht ◽  
V. V. Goman ◽  
A. S. Paramonov
Keyword(s):  
Genetic Algorithm ◽  
Power Factor ◽  
Electric Motor ◽  
Induction Motors ◽  
Magnetic Circuit ◽  
Traction Force ◽  
Equivalent Circuits ◽  
Electric Motors ◽  
Linear Induction ◽  
Secondary Element

The article focuses on the use of genetic algorithms for the design of linear induction motors. Comparison of genetic algorithm with classical methods in the context of electrical machines designing has been carried out. The results of solving an optimization problem for two designs are presented, viz. a laboratory linear induction electric motor based on a three-phase SL-5-100 inductor and a traction single-sided linear induction electric motor of an urban transport system. The optimality criterion included maximizing the power factor and efficiency, as well as the rigidity of the mechanical characteristic while ensuring a starting traction force of at least a set value. The results of optimization of such parameters of the secondary element as the width and thickness of the conductive strip as well as the thickness of the magnetic circuit are described. The relevance of the problem of optimizing the parameters of the secondary element with unchanged parameters of the inductor is due to the fact that the same inductor can be used to build various structures, while the secondary element is created for each specific application and integrated directly into the working body of the mechanism or is a driven product. To calculate the traction and energy characteristics of linear induction electric motors, an electromagnetic model based on detailed equivalent circuits was used, taking into account longitudinal and transverse edge effects and providing a calculation time for one set of parameters of about 1 s. In accordance with this model, the electric motor is reduced to a set of three detailed equivalent circuits: a magnetic circuit, primary and secondary electrical circuits. The result of the optimization of these electric motors was an increase in the efficiency by 1.6 and 1.4 %, respectively, an increase in the power factor by 0.9 and 0.2 %, and an increase in the rigidity of traction characteristics and starting traction force.

Recycled Strontium Hexaferrite Permanent Magnet from Mill Scale Waste to Improve Energy Efficiency in Synchronous Electric Motors

2021 ◽  
Author(s):  
Kürsat ICIN ◽  
Sultan Öztürk ◽  
Damla Dilara Çakıl ◽  
Sefa Emre Sünbül ◽  
İbrahim Ergin ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Permanent Magnet ◽  
Strontium Hexaferrite ◽  
Electric Motors ◽  
Mill Scale ◽  
Improve Energy Efficiency

scholarly journals Feasibility Study of Direct-on-Line Energy-Efficient Motors in a Pumping Unit, Considering Reactive Power Compensation

Mathematics ◽  
2021 ◽  
Vol 9 (18) ◽  
pp. 2196
Author(s):  
Vadim Kazakbaev ◽  
Safarbek Oshurbekov ◽  
Vladimir Prakht ◽  
Vladimir Dmitrievskii
Keyword(s):  
Permanent Magnet ◽  
Energy Efficient ◽  
Reactive Power ◽  
Economic Effect ◽  
Payback Period ◽  
Line Energy ◽  
Synchronous Reluctance Motor ◽  
Reluctance Motor ◽  
On Line ◽  
The Cost

The paper compares the economic effect of using capacitors in fixed speed drives of a pumping station when using energy-efficient motors of various types. Induction motors of IE2 and IE3 energy efficiency classes, a direct-on-line synchronous motor with a permanent magnet in the rotor, and a direct-on-line synchronous reluctance motor are considered. The comparison takes into account not only the efficiency of the motors, but also their power factor, on which the losses in the cable and transformer depend. The possibility of using static capacitors to compensate for the reactive power of motors and reduce the losses is also considered. The feasibility analysis takes into account that the motors have different initial costs. The cost of capacitors is also taken into consideration. The analysis shows that the use of static capacitors can have a significant impact on the comparison between different motors in this application. Without considering capacitors, the permanent magnet motor has the shortest payback period, otherwise the synchronous reluctance motor has the shortest payback period.

scholarly journals Power Losses and Power Factor Improvement of Factory Electrical Network Power Plants using Bank Capacitors

2019 ◽  
Vol 9 (2) ◽  
pp. 2705-2710
Keyword(s):  
Power Factor ◽  
Power Plants ◽  
Electrical Network ◽  
Electric Motors ◽  
Power Losses ◽  
Capacitor Banks ◽  
Electrical Loads ◽  
The Right ◽  
Power Factor Improvement ◽  
Network Power

This paper presents power losses and power factor improvement of factory electrical network power plants using bank capacitors. In its operation, the electrical system always experiences losses and decreases in power factor. This condition is caused if the electrical loads are electric motors. A load of electric motors is inductive, which has a low power factor. This condition is often experienced in factories. Therefore in this study, capacitor banks are applied to reduce power losses and increase power factors. The results showed that the installation of capacitor banks with the right capacity was able to reduce losses and significantly increase the power factor of the system.

scholarly journals Energy efficiency of a 3-level shunt active power filter powered by a fuel-cell / battery DC bus with regulated duty cycles

2021 ◽  
pp. 30-38
Author(s):  
B. Bourouis ◽  
H. Djeghloud ◽  
H. Benalla
Keyword(s):  
Energy Efficiency ◽  
Fuel Cell ◽  
Power Factor ◽  
Active Power ◽  
Load Factor ◽  
Power Losses ◽  
Shunt Active Power Filter ◽  
Power Filter ◽  
Duty Cycles ◽  
Dc Bus

Introduction. Nowadays, electrical energy is indispensable in industrial, tertiary and domestic appliances. However, its efficiency is becoming affected by the presence of the disturbances that appear in the electrical networks such as harmonics, unbalance, sags/swells, flickers …etc. Indeed, the disturbances cause a decrease in the power factor and an increase in the power losses. In this paper, the harmonic disturbance is considered and a 3-level shunt active power filter powered by a hybrid fuel-cell/battery DC is applied to mitigate current harmonic components from the electrical feeder. Aim. Studying the energy efficiency of a system based on a 3-level shunt active filter powered by a hybrid fuel-cell / battery DC bus. Methodology. It is a matter of finding the suitable formulas that express the efficiency and the relative power losses according to the load factor (which is the ratio between the short-circuit active power and the load active power) and the load power factor. The DC bus energy is controlled using an energy management algorithm that contributes in generating the required reference input currents and output voltages of the fuel-cell and the battery. The DC/DC converters control circuits are performed in a closed loop by means of regulated duty cycles. Results. The simulation results carried-out under MATLAB/Simulink environment show better filtering quality if compared with the case of open loop control of the DC/DC converters and lesser differences between the fuel-cell power, the battery power and their respective reference powers. Which concerns the energy efficiency, the results demonstrate that higher efficiency and lower relative power losses can be achieved only when higher load factor and load power factor are attained. Therefore, the compensating system of the power factor is very important to improve the energy efficiency.

Sign in / Sign up

Export Citation Format

Share Document