scholarly journals ENERGY INDICATORS OF AXIAL INDUCTION DISK-SHAPED MOTOR FOR SHIP RADARS

2021 ◽  
Vol 2021 (5) ◽  
pp. 38-48
Author(s):  
R.S. Kryshchuk ◽  
◽  
S.I. Gavryluk ◽  
A.A. Tsugankova ◽  
◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Numerical Calculation ◽  
Frequency Converter ◽  
Magnetic Core ◽  
Radial Coordinate ◽  
Current Frequency ◽  
Energy Characteristics ◽  
Integral Transformations ◽  
Energy Indicators ◽  
The Magnetic Field

The development of a reliable gearless electric drive for antennas of ship radars is an important problem. To solve the problem, this article proposes to use an axial induction motor (AIM) with a massive bimetallic disk-shaped rotor. The AIM model is presented, which consists of three computational domains with the boundary condition of symmetry. To calculate the electromagnetic field, a well-known analytical method of integral transformations is used taking into account the variable along the radial coordinate of the linear speed of the rotor. Ready-to-use expressions are presented for the development of a program for the numerical calculation of the magnetic field and energy characteristics of the motor. Algorithm is developed for calculating the dimensions of the AIM, operating at different speeds with a frequency converter. The numerical calculation program is used to calculate the dimensions AIM. It uses well-known recommendations for the parameters of the electromagnetic field in the magnetic core and in the air gap. The calculation of the dimensions of the AIM for ship radars “Mius” is performed. The dependence of the efficiency on the current frequency for different rotor’s frequencies is investigated. The energy indicators of the AIM are investigated at a variable torque on the shaft and at different rotor speeds. The parameters of the power source for the AIM of ship radars are established. References 20, figures 5, tables 3.

scholarly journals STARTING UP AND REGULATING THE ROTATIONAL SPEED OF A POWERFUL ELECTRIC DRIVE USING A MAGNETIC REDUCING GEAR

2020 ◽  
pp. 16-23
Author(s):  
Alexander A. Afanasyev
Keyword(s):  
Electric Motor ◽  
Permanent Magnets ◽  
Frequency Converter ◽  
Input Voltage ◽  
Magnetic Core ◽  
Stator Winding ◽  
State Equations ◽  
Current Frequency ◽  
Reducing Gear ◽  
Load Mode

The article examines a magnetic reducing gear, the stator winding of which receives power in the mode of a valve machine. In the absence of this supply, the electric motor can be started-up in no-load mode. To significantly reduce the power of the magnetic reducing gear frequency converter compared to the power of the adjustable electric motor, it is necessary to make the number of the rotor's pairs of poles with permanent magnets of a magnetic reducing gear large enough. In this case, the design of arranging the magnets in radial grooves is the most adequate, ensuring the concentration of fluxes per pole in the air gaps. The stator winding of such a magnetic reducing gear will be low-pole. When manufacturing a magnetic reducing gear, it is possible to use a stator magnetic core of a serial asynchronous machine together with its regular winding. The electromagnetic moments of the magnetic gearbox rotors are a consequence of the presence of a stator electromagnetic moment. The stator's current frequency is represented by two components, of which the first is defined from the state equations and the second is a constant forming an additional channel of functional influence. The speed of rotation of the gear shafts can be adjusted by changing the specified constant and the input voltage of the frequency converter. The equations of the magnetic reducer state describing its functional modes were solved by means of the Mathcad mathematical program.

Investigating flexible textile-based coils for wireless charging wearable electronics

2019 ◽  
Vol 50 (3) ◽  
pp. 333-345 ◽  
Author(s):  
Danmei Sun ◽  
Meixuan Chen ◽  
Symon Podilchak ◽  
Apostolos Georgiadis ◽  
Qassim S Abdullahi ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electrical Conductivity ◽  
Electromagnetic Field ◽  
Electric Field ◽  
Dimensional Stability ◽  
Screen Printing ◽  
Wearable Electronics ◽  
Wireless Charging ◽  
The Magnetic Field ◽  
Screen Printed

Smart and interactive textiles have been attracted great attention in recent years. This research explored three different techniques and processes in developing textile-based conductive coils that are able to embed in a garment layer. Coils made through embroidery and screen printing have good dimensional stability, although the resistance of screen printed coil is too high due to the low conductivity of the print ink. Laser cut coil provided the best electrical conductivity; however, the disadvantage of this method is that it is very difficult to keep the completed coil to the predetermined shape and dimension. The tested results show that an electromagnetic field has been generated between the textile-based conductive coil and an external coil that is directly powered by electricity. The magnetic field and electric field worked simultaneously to complete the wireless charging process.

Increasing the effective affect of the magnetic field on the weld pool

2021 ◽  
pp. 29-33
Author(s):  
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Magnetic Fields ◽  
Weld Pool ◽  
Electromagnetic Effects ◽  
Weld Pools ◽  
The Magnetic Field

Variants of weld pools obtained by verification with the influence of magnetic fields are considered. Methods for increasing the effectiveness of electromagnetic effects during welding are proposed. Keywords: welding, electromagnetic field, weld pool, induction, coating. [email protected], [email protected]

Experimental Study on Differentiating between Natural Honey and Honey Glucose Syrup by Using Hall Effect Sensor

2018 ◽  
Vol 775 ◽  
pp. 231-237
Author(s):  
Witsarut Sriratana ◽  
Siwakon Sokjabok ◽  
Lerdlekha Sriratana
Keyword(s):  
Electromagnetic Field ◽  
Hall Effect ◽  
High Frequency ◽  
Output Voltage ◽  
Electrical Conductance ◽  
Magnetic Core ◽  
Hall Effect Sensor ◽  
Sugar Substitute ◽  
Glucose Syrup ◽  
Natural Honey

This study presents the application of Hall Effect sensor for differentiating the combination of liquids based on electrical conductance. Electromagnetic field was generated from wire (AWG 31) bound on high frequency magnetic core namely Toroidal iron power (T131-26) or C-shape Toroidal core. In this study, the electrochemical cell was fixed at 0.09375 cm-1 and there were 10 samples of several liquid types for testing. Hall Effect sensor was designed to place with high frequency magnetic cores bound by 310-turns wire. From experiment using electromagnetic field generated by C-shape Toroidal core, it can be observed that the samples of natural honey from Germany (J) and sugar substitute for diabetics (I) could be distinguished by considering output voltage of Hall Effect sensor (VH) and electrical conductance. The output voltage and the electrical conductance from measurement of natural honey (J) were 3.037 V and 0.941 mS.T, respectively while those from measurement of sugar substitute (I) were 3.030 V and 0.938 mS.T, respectively. Moreover, it can be noted that this methodology could be applied for measuring electrical conductance of several liquid types due to the relationships of output voltage of Hall Effect sensor and electrical conductance of liquid. However, only C-shape Toroidal core was used in this study due to the appropriate generation of electromagnetic field for differentiating both sample liquid types with 1.83% of error for natural honey and 1.51% of error for sugar substitute from 195 times of repetitive measurement.

A Proof of the Biot-Savart Law

1968 ◽  
Vol 72 (689) ◽  
pp. 437
Author(s):  
B. G. Newman
Keyword(s):  
Magnetic Field ◽  
Field Theory ◽  
Electromagnetic Field ◽  
Fluid Mechanics ◽  
Small Length ◽  
Line Vortex ◽  
Line Current ◽  
Electromagnetic Field Theory ◽  
The Magnetic Field

The Biot-Savart law gives the velocity associated with an elemental portion of line vortex, or the magnetic field associated with an elemental portion of line current. The following proof may appeal to students who approach fluid mechanics or electromagnetic-field theory from the engineering viewpoint. It will be stated in terms of fluid mechanics. Consider a very small length δs of line vortex of circulation strength Γ. At P(x) the velocity δV associated with this portion depends on Γ δs and x.

Effects of Electromagnetic Fields on the Quantum Yield of Free Radicals in Cryptochrome

2019 ◽  
Vol 953 ◽  
pp. 127-132
Author(s):  
Yu Ling Chen ◽  
Du Yan Geng ◽  
Chuan Fang Chen
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Free Radicals ◽  
Free Radical ◽  
Quantum Yield ◽  
Electromagnetic Fields ◽  
Applied Magnetic Field ◽  
Geomagnetic Field ◽  
Quantum Biology ◽  
The Magnetic Field

In this paper, the effects of the quantum yield of free radicals in cryptochrome exposed to different electromagnetic fields were studied through the quantum biology. The results showed that the spikes characteristics was produced in the free radicals in cryptochrome, when it exposed to the applied magnetic field (ω = 50 Hz, B0 = 50 μT). The spikes produced by the electromagnetic field was independent of the changes of polar θ. When the frequency of the magnetic field increased, the spikes characteristics produced in unit time also increased. These results showed that the environmental electromagnetic field could affect the response of organisms to the geomagnetic field by influencing the quantum yield in the mechanism of free radical pair.It provided a basis for studying the influence of environmental electromagnetic field on biology, especially the navigation of biological magnetism.

A Proposed Experiment of Direct Detecting of the Vector Potential within Classical Electrodynamics

1997 ◽  
Vol 11 (12) ◽  
pp. 531-540
Author(s):  
V. Onoochin
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Charged Particle ◽  
Vector Potential ◽  
Energy Exchange ◽  
Short Pulse ◽  
Classical Electrodynamics ◽  
Direct Influence ◽  
Ultra Short Pulse ◽  
The Magnetic Field

An experiment within the framework of classical electrodynamics is proposed, to demonstrate Boyer's suggestion of a change in the velocity of a charged particle as it passes close to a solenoid. The moving charge is replaced by an ultra-short pulse (USP), whose characteristics should depend on the current in the coil. This dependence results from the exchange of energy between the electromagnetic field of the pulse and the magnetic field within the solenoid. This energy exchange could only be explained, by assuming that the vector potential of the solenoid has a direct influence on the pulse.

A Working of Eddy Current Transducers under Control of Ferromagnetic Pipes in Condition of Insufficient Magnetic Saturation

2013 ◽  
Vol 467 ◽  
pp. 528-530
Author(s):  
Kai Yu Hao ◽  
Vadim Miroshnikov
Keyword(s):  
Electromagnetic Field ◽  
Numerical Calculation ◽  
Eddy Current ◽  
Maxwell Equations ◽  
Control Sample ◽  
Magnetic Saturation ◽  
Method Of Calculation ◽  
Current Transducer ◽  
Object Of Control ◽  
Eddy Current Transducer

The numerical method of calculation of electromagnetic field in a control sample at a time of work of encircling eddy current transducer is offered. The method is based on a numerical solution of the two Maxwell equations, which connect a change of electrical and magnetic fields. It allows to make calculations taking into account the actual value of magnetic inductivity of metal and to get results in any form, convenient for further interpretations. For the calculation of the encircling eddy current transducer the equivalent circuit of defect as step junction is offered. The numerical calculation shows, that the greatest sensitivity of the transducer is achieved when the value of magnetic permeability of the object of control is approximately 10-30. Therefore, it is not necessary to lead the material of the object of control up to satiety, as it considered before.

Sign in / Sign up

Export Citation Format

Share Document