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.

scholarly journals Linear Induction Motors without Longitudinal Edge Effect

2019 ◽  
Vol 5 (2) ◽  
pp. 60-69 ◽  
Author(s):  
Vladimir A. Solomin ◽  
Andrei V. Solomin ◽  
Anastasia A. Chekhova ◽  
Larisa L. Zamchina ◽  
Nadezda A. Trubitsina
Keyword(s):  
Edge Effect ◽  
Induction Motors ◽  
Magnetic Levitation ◽  
Track Structure ◽  
Linear Induction ◽  
Linear Induction Motor ◽  
High Speeds ◽  
Longitudinal Edge ◽  
Secondary Element ◽  
Linear Induction Motors

Background: At high speeds of motion of the magnetic-levitation transport (MLT), linear induction motors (LIM) have a secondary longitudinal edge effect (SLEE). SLEE occurs when magnetic field of inductor interacts with the currents of the secondary element (SE) outside the MLT crew. SLEE reduces the efficiency of traction LIM. Therefore, the task of reducing the influence of SLEE is relevant. Aim: Development and research of a linear induction motor without a secondary longitudinal edge effect. Methods: To achieve this aim, new designs of linear induction motors have been proposed, which do not have a SLEE. The secondary element of the LIM (track structure of the MLT) is made of cylindrical conductive rods installed with the possibility of rotation. Traction LIM of the MLT equipped with two brushes that close the rods of the SE within the length of the inductor. When the MLT crew moves, the rods outside the inductor are not closed by brushes and there is no current in them. There will be no SLEE. Another method to solve this problem is using reed switches to close and open the rods of the secondary element. Results: The possibility of increasing the efficiency of the LIM has been achieved.

scholarly journals Equivalent circuits for single-sided linear induction motors

2009 ◽  
Author(s):  
Wei Xu ◽  
Jianguo Zhu ◽  
Youguang Guo ◽  
Yi Wang ◽  
Yongchang Zhang ◽  
...  
Keyword(s):  
Induction Motors ◽  
Equivalent Circuits ◽  
Linear Induction ◽  
Linear Induction Motors

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.

scholarly journals Equivalent Circuits for Single-Sided Linear Induction Motors

2010 ◽  
Vol 46 (6) ◽  
pp. 2410-2423 ◽  
Author(s):  
Wei Xu ◽  
Jian Guo Zhu ◽  
Yongchang Zhang ◽  
Zixin Li ◽  
Yaohua Li ◽  
...  
Keyword(s):  
Induction Motors ◽  
Equivalent Circuits ◽  
Linear Induction ◽  
Linear Induction Motors

Mechatronic Systems with Linear Induction Motors of Dampers

2006 ◽  
Vol 113 ◽  
pp. 67-72
Author(s):  
A.J. Poska ◽  
A. Smilgevičius ◽  
R. Rinkevičienė
Keyword(s):  
Control Systems ◽  
Induction Motors ◽  
Dynamic Processes ◽  
Pulse Control ◽  
Technological Parameters ◽  
Mechatronic Systems ◽  
Linear Induction ◽  
Linear Induction Motor ◽  
Process Control Systems ◽  
Secondary Element

The purpose of the paper is, from the view of system engineering, to investigate mechatronic systems with uncontrolled or pulse controlled dampers that are equipped with a linear induction motor (LIM), the secondary element of which appears as a moving element of a damper. The main technological parameters determining the requirements for linear induction drives applied in the automatic protection and technological process control systems were investigated. Methods to investigate electromagnetic, electromechanical and thermal dynamic processes at pulse control of large cross-area dampers were proposed, and application of results of the investigation was considered.

scholarly journals Starting forces of the traction linear induction motor with adjustable resistance of the short-circuited winding of the secondary element

2021 ◽  
Vol 7 (2) ◽  
pp. 87-96
Author(s):  
Vladimir A. Solomin ◽  
Andrei V. Solomin ◽  
Anastasia A. Chekhova
Keyword(s):  
Induction Motor ◽  
Induction Motors ◽  
Rolling Stock ◽  
Traction Forces ◽  
Linear Induction ◽  
Linear Induction Motor ◽  
Urgent Task ◽  
Traction Drives ◽  
Secondary Element ◽  
Linear Induction Motors

Background: Development and research of linear traction drives for Maglev transport is an urgent task. Linear induction motors can be used as traction machines for advanced rolling stock. Aim: Study of the starting characteristics of an adjustable traction linear induction motor with variable resistance by a short-circuited winding of the secondary element. Methods: Theoretically, relations were obtained for calculating the traction starting forces of an adjustable linear induction motor with various designs of a short-circuited winding of the secondary element. Results: Based on the obtained ratios, the calculations of the starting traction forces of linear induction motors intended for use in promising modes of transport were performed. Conclusion: The results of calculating the starting traction forces of adjustable linear induction motors make it possible to reasonably select the modes of starting the motor depending on the design of the secondary winding.

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