STUDY OF CURRENT TRANSFORMERS MAGNETIC FIELD BY METHOD FINAL ELEMENTS USING THE FEMM SOFTWARE COMPLEX

2019 ◽  
Vol 2 (4) ◽  
pp. 317-327
Author(s):  
Olha Babiychuk ◽  
Viktor Boltenkov ◽  
Volodimir Shevchenko
Keyword(s):  
Magnetic Field ◽  
Current Transformers ◽  
Software Complex ◽  
Femm Software

Parameters Consideration in Designing a Magnetorheological Damper

2013 ◽  
Vol 543 ◽  
pp. 487-490 ◽  
Author(s):  
Izyan Iryani Mohd Yazid ◽  
Saiful Amri Mazlan ◽  
Hairi Zamzuri ◽  
M.J. Mughni ◽  
S. Chuprat
Keyword(s):  
Magnetic Field ◽  
Finite Element Method ◽  
Circuit Design ◽  
Software Package ◽  
Mixed Mode ◽  
Mr Damper ◽  
Magnetorheological Damper ◽  
Femm Software ◽  
The Magnetic Field ◽  
Selection Of

This paper presents a simulation study of electromagnetic circuit design for a mixed mode Magnetorheological (MR) damper. The magnetic field generated by electromagnetic circuit of the MR damper was simulated using Finite Element Method Magnetics (FEMM) software package. All aspects of geometry parameters were considered and adjusted efficiently in order to obtain the best MR damper performance. Eventually, six different parameters approach were proposed; the selection of materials, the polarity of coils, the diameter of piston, piston rod and core, the shear and squeeze gaps clearance, the piston pole length and the thickness of housing.

Application of Serpentine Flux Path Method into a Magnetorheological Valve by FEMM Simulation

2015 ◽  
Vol 1123 ◽  
pp. 7-11 ◽  
Author(s):  
Abdul Yasser Abd Fatah ◽  
Saiful Amri Mazlan ◽  
Hairi Zamzuri ◽  
Mohd Azizi Abdul Rahman
Keyword(s):  
Magnetic Field ◽  
Magnetic Flux ◽  
Magnetic Materials ◽  
Gap Size ◽  
Input And Output ◽  
Real Hardware ◽  
Flux Path ◽  
Femm Software ◽  
Magnetorheological Valve ◽  
The Magnetic Field

Magnetorheological (MR) valve is one of the basic ways to apply and accommodate the MR fluid (MRF) into most of hydraulic applications. MRF can change its rheological properties controllably, reversibly and instantaneously by exposing it to the magnetic field, where the viscosity of the fluid increased variably proportionate to the intensity of the magnetic field applied to the fluid. Within the MR valve, the region where the MRF is allowed to be flown and exposed to the magnetic field is called the effective region, and the longer the effective region is in the MR valve, the higher the pressure drop can be, which means that the valve can withstand higher pressure from input and output of the valve. Hence, lots of studies and previous researches have been focused on improving the performance of MR valve by elongating the effective region in the valve. This paper presents one of the ways to increase the effective region in the MR valve by using the serpentine flux path method. This method is a way to weave the magnetic flux into the effective region of MR valve by alternating the magnetic and non-magnetic materials to guide the magnetic flux to be exposed into the effective region. In this paper, the method is simulated by using Finite Element Method Magnetics (FEMM) software for analyzing the magnetic flux path and flux density in the valve, to see the various effects of length and gap size of effective region, electromagnetic circuits and geometrical placements of magnetic and non-magnetic materials in the valve before it can be applied into real hardware for experimentation.

Simulation Connection of Current Transformers and Winding of Relay in B2 Spice Software Complex

2021 ◽  
Author(s):  
Sagid A. Abdulkerimov ◽  
Khurshed B. Nazirov ◽  
Bahodur A. Ghayurov ◽  
Shokhin D. Dzhuraev ◽  
Mukhammadzhon M. Kamolov ◽  
...  
Keyword(s):  
Current Transformers ◽  
Software Complex

scholarly journals Algorithms for Functioning of the Magneto-Metric System to Provide Search and Rescue Operations Using Unmanned Flying Vehicles

2020 ◽  
Vol 23 (6) ◽  
pp. 210-224
Author(s):  
D. E. Gutsevich ◽  
G. M. Proskuryakov ◽  
V. N. Slonov ◽  
D. P. Teterin ◽  
E. A. Titenko ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Intelligent System ◽  
Search And Rescue ◽  
The Arctic ◽  
Software Complex ◽  
Land Vehicles ◽  
Additional Information ◽  
Measurement Units ◽  
The Stability ◽  
Physical Quantities

Purpose of research. Reducing the time and increasing the efficiency of search and rescue of crews of land vehicles, air, surface and underwater craft. Combining physical, informational, and geometric parameters allows reliable detection of single ferromagnetic bodies by analyzing additional information in working algorithms.Methods. The paper contains a practically significant variant of building a search engine that is implemented on two or more unmanned flying vehicles moving in the search area in a coordinated formation at the basic distance. The solution system is based on using magnetic field components as magnetometric information without using primary gradient information. This feature allows us to get compact and functionally complete algorithms. Calculations using such algorithms ensure the stability of an  unmanned flying vehicle in various combinations of vector, roll and pitch.Results. Algorithms for the functioning of the magnetometric system for searching ferromagnetic bodies based on the magnetostatic equations have been constructed in the article,. The intelligent system is based on the scheme of a measuring and computing circuit with staggered vector three-axis blocks of magnetometers in space. The system is able to solve the whole range of problems of search, detection, direction finding, localization, positioning and identification of metal objects that have their own magnetic field.Conclusion. The main result of the study is that the working algorithms for detecting ferromagnetic bodies take into account the characteristics of the air environment, the instrumental error of measurement units of physical quantities and  the geometric proportions of measuring equipment  location  on board the unmanned and manned search and rescue helicopters. The obtained research results have been used in the development of a hardware and software complex with helicopter-type unmanned flying vehicles designed to support search and rescue operations in the Arctic.

Immunity of current-to-voltage transducer, with coils manufactured by means of multilayered PCB technology, to external magnetic fields

2015 ◽  
Vol 34 (4) ◽  
pp. 1156-1171
Author(s):  
Elzbieta Lesniewska
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Rogowski Coil ◽  
3D Analysis ◽  
External Fields ◽  
Current Transformers ◽  
Content Type ◽  
Voltage Transducer ◽  
Secondary Voltage ◽  
Instrument Transformers

Purpose – The purpose of this paper is to discuss the operation of new generation electromagnetic current-to-voltage transducer. The aim of research was analysis of behaviour of considered current-to-voltage transducers during operation. The main problem was to estimate whether the external fields are able to change the value of the secondary voltage and that the replacement of the casing material by a conductive or ferromagnetic material will increase the immunity of the transducer to external magnetic fields. The immunity of current-to-voltage transducers to the external fields is very important because it influences the proper functioning of the protection system. Design/methodology/approach – The use of analytical methods to assess the influence of external fields was impossible due to the complexity of the geometry. The 3D computations were necessary because of different cross sections of circuit boards at different heights. Therefore the numerical 3D field-and-circuit method based on finite element method was applied. The wide range of dimensions in computation system, ranging from 0.15 mm (print paths) to 0.22 m, made it necessary to use the mesh of millions of elements. The division of this type of system into elements requires a diverse and extremely dense mesh in the area of printed circuits board (PCBs). Findings – The 3D analysis of magnetic field distribution was performed for different external field effect upon a current-to-voltage transducer. The magnetic field distributions and the induced secondary voltage for several different cases were presented. As a conclusion it can be said that in this particular case the magnetic shield is most effective. The influence of external magnetic fields caused by currents passing through the other neighbouring phase bars near are insignificant for the transducer with non-magnetic core. Practical implications – Commonly used in measuring and protection systems of the transmission lines are induction instrument transformers. The instrument transformers are very precise devices and their errors are counted in tenths of a per cent, and phase displacement of signals in minutes. Especially in HV systems they are very big and their cores are heavy. Replacement of instrument transformers by the current to voltage transducers cooperating with electronic measuring systems will reduce the size and cost of devices. Originality/value – The requirements set for protective current transformers concern the transformation of currents, with high accuracy, especially at transient states. Therefore magnetic characteristics of their cores should be linear. It causes that cores are large and have some air gaps. Current-to-voltage transducers based on Rogowski coil are particularly suitable for the replacement of the protective current transformers because of their linearity. The traditional technologies used for making Rogowski coil consisted in winding a wire on a non-magnetic carcass. The development of technology has enabled the use of new technologies PCB high density interconnect in the production of Rogowski coil.

scholarly journals Determination of the magnitude of short-circuit surge current for the construction of relay protection on reed switches and microprocessors

2021 ◽  
Vol 6 (5 (114)) ◽  
Author(s):  
Alexandr Neftissov ◽  
Andrii Biloshchytskyi ◽  
Olzhas Talipov ◽  
Oxana Andreyeva
Keyword(s):  
Magnetic Field ◽  
Short Circuit ◽  
Relay Protection ◽  
Main Element ◽  
Current Transformers ◽  
Transient Mode ◽  
Protection Devices ◽  
Aperiodic Component ◽  
Surge Current

A study of the functioning of reed switches under the influence of a magnetic field created by a current in a conductor in a transient mode with the presence of an aperiodic component has been carried out. A well-known method for determining current using reed switches was implemented. At the same time, it was determined that the originally formulated method did not give the required result within the limits of errors. This is most likely due to the peculiarities of the mechanism of movement of the reed switch contacts. Alternatively, the measurements were taken to take the return currents instead of the pick-up currents and the time between the return times. They are more stable. Simulation is performed, experimental determination of the value of surge current by measuring time is carried out. The main element of the created installation was the power transformer coil with low active and high inductive resistance. As part of the study, the reed switches were placed in a magnetic field with an aperiodic component, as in the transient mode. This study will show the applicability of reed switches for the construction of relay protection devices that will not need current transformers to obtain information about the primary current in the conductor. In the course of the research, it was found that the error in determining the magnitude of current was no more than 10 %. Using microprocessors, it is possible to build relay protection devices with a speed of up to 20 ms. This result makes it possible to build new devices. Since in the well-known developments, it was only said about determining the magnitude of current in a steady state. When building relay protection devices on reed switches, without using current transformers, it will be possible to build backup protections that duplicate not only the devices themselves, but also the primary measuring transformers with other sensitive elements. This will improve the reliability of the power supply.

scholarly journals Optimization of the Emitting Coil of a Hardware-Software Complex for Study of Low-Frequency Electromagnetic Radiation’s Shielding Effectiveness

2021 ◽  
Vol 12 (1) ◽  
pp. 30-37
Author(s):  
O. D. Kanafyev ◽  
A. V. Trukhanov ◽  
T. I. Zubar ◽  
S. A. Chizhik ◽  
S. S. Grabchikov
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Electromagnetic Radiation ◽  
Magnetic Field Strength ◽  
Low Frequency ◽  
Single Layer ◽  
Total Resistance ◽  
Optimal Parameters ◽  
Frequency Range ◽  
Software Complex

Optimization of the radiation coil of the hardware-software complex for studying the effectiveness of shielding of low-frequency electromagnetic radiation will make it possible to assess the effectiveness of shielding coatings at a higher level. This fact will make it possible to develop coatings with improved characteristics. The purpose of this work was to determine the optimal characteristics of the emitting coil which will ensure its stable operation and magnetic field strength in the frequency range up to 100 kHz.The parameters of the manufactured samples, such as inductance (L), active (R) and total resistance (Z), were obtained using an MNIPI E7-20 emittance meter. In practice, the coils with the optimal parameters calculated theoretically were connected to a current source and amplifier. To detect electromagnetic radiation, a multilayer inductor connected to a UTB-TREND 722-050-5 oscilloscope was used as a signal receiver.The results of measurements showed that the resistance of multilayer coils is approximately 1000 times higher than that of single-layer coils. Also, for multilayer coils, an avalanche-like increase in total resistance is observed starting from a frequency of 10 kHz, while for single-layer coils there is a uniform increase in total resistance over the entire frequency range up to 100 kHz.The paper presents results of research on the correlation of the performance of single-layer and multilayer inductors depending on their parameters in the frequency range from  20 Hz  to  100 kHz. Values of the voltage required to provide the magnetic field strength of 1, 5, 20 Oe at 25 Hz and 100 kHz have been calculated. After analyzing the data obtained, the optimal parameters of the inductor were found which ensure stable performance in the frequency range up to 100 kHz.

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