Numerical Analysis of Electromagnetic Field of Solid Rotor Asynchronous Permanent Magnetic Coupling by Finite Element Method

A new-type of solid rotor asynchronous magnetic coupling which works on the principle of electromagnetic induction is researched by ourselves. This kind of asynchronous magnetic coupling can solve the problem effectively that the permanent magnets on its inner rotor is demagnetized if its temperature is too high, because its inner rotor need not the permanent magnets. in order to study the transmission capability of the new-type magnetic coupling, its magnetic field should be analyzed. Because of its magnetic field variety, it is extremely complicated and a precision result is difficult to be got by the analytic method of the magnetic field calculation. Here the software ANSYS FEM is used to analyze its magnetic field. And some formulas were deduced and used to calculate its torque. The experimental and calculational results indicate that this design is practicable.

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Design of a New 1D Halbach Magnet Array with Good Sinusoidal Magnetic Field by Analyzing the Curved Surface

Sensors ◽

10.3390/s21072522 ◽

2021 ◽

Vol 21 (7) ◽

pp. 2522

Author(s):

Guangdou Liu ◽

Shiqin Hou ◽

Xingping Xu ◽

Wensheng Xiao

Keyword(s):

Magnetic Field ◽

Magnetic Flux ◽

Permanent Magnet ◽

Flux Density ◽

Permanent Magnets ◽

Air Gap ◽

Curved Surface ◽

Magnetic Flux Density ◽

Sinusoidal Magnetic Field ◽

The Magnetic Field

In the linear and planar motors, the 1D Halbach magnet array is extensively used. The sinusoidal property of the magnetic field deteriorates by analyzing the magnetic field at a small air gap. Therefore, a new 1D Halbach magnet array is proposed, in which the permanent magnet with a curved surface is applied. Based on the superposition of principle and Fourier series, the magnetic flux density distribution is derived. The optimized curved surface is obtained and fitted by a polynomial. The sinusoidal magnetic field is verified by comparing it with the magnetic flux density of the finite element model. Through the analysis of different dimensions of the permanent magnet array, the optimization result has good applicability. The force ripple can be significantly reduced by the new magnet array. The effect on the mass and air gap is investigated compared with a conventional magnet array with rectangular permanent magnets. In conclusion, the new magnet array design has the scalability to be extended to various sizes of motor and is especially suitable for small air gap applications.

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Calculation of the magnetic field and parameters of synchronous motors with ceramic permanent magnets using the boundary element method

Engineering Analysis ◽

10.1016/0264-682x(87)90013-x ◽

1987 ◽

Vol 4 (2) ◽

pp. 58-65 ◽

Cited By ~ 5

Author(s):

Razvan Magureanu ◽

Nicolae Vasile ◽

Marinela Tiba

Keyword(s):

Magnetic Field ◽

Boundary Element Method ◽

Boundary Element ◽

Permanent Magnets ◽

Synchronous Motors ◽

The Magnetic Field ◽

Element Method

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ANALYTICAL EXPRESSION OF THE MAGNETIC FIELD CREATED BY TILE PERMANENT MAGNETS TANGENTIALLY MAGNETIZED AND RADIALS CURRENT IN MASSIVE DISKS

Progress In Electromagnetics Research B ◽

10.2528/pierb09012704 ◽

2009 ◽

Vol 13 ◽

pp. 309-328 ◽

Cited By ~ 10

Author(s):

Romain Ravaud ◽

Guy Lemarquand

Keyword(s):

Magnetic Field ◽

Permanent Magnets ◽

Analytical Expression ◽

The Magnetic Field

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A Feasibility Study of a Noncontact Torque Sensor with Multiple Hall Sensors

Journal of Sensors ◽

10.1155/2015/126935 ◽

2015 ◽

Vol 2015 ◽

pp. 1-6 ◽

Cited By ~ 3

Author(s):

Kyungshik Lee ◽

Chongdu Cho

Keyword(s):

Magnetic Field ◽

Permanent Magnets ◽

Power Transmission ◽

Magnetic Sensors ◽

Torque Sensor ◽

Torque Measurement ◽

Test Range ◽

Variable Power ◽

Hall Sensors ◽

The Magnetic Field

The feasibility of a noncontact sensor is investigated. This type of sensor can potentially be used for torque measurement in a speed-variable power transmission system. Torque can be read by examining the phase difference between two induction signals from respective magnetic sensors that detect the magnetic field intensity of permanent magnets mounted on the surface of a shaft in rotation. A real-time measuring algorithm that includes filtering and calibration is adopted to measure the torque magnitude. It is shown that this new torque sensor can perform well under rotation speeds ranging from 300 rpm to 500 rpm. As an interim report rather than a complete development, this work demonstrates the feasibility of noncontact torque measurement by monitoring a magnetic field. The result shows an error of less than 2% within the full test range, which is a sufficient competitive performance for commercial sensors. The price is very low compared to competitors in the marketplace, and the device does not require special handling of the shaft of the surface.

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Numerical simulation of induction heating thick-walled tubes

MATEC Web of Conferences ◽

10.1051/matecconf/201816802004 ◽

2018 ◽

Vol 168 ◽

pp. 02004

Author(s):

Richard Lenhard ◽

Milan Malcho ◽

Katarína Kaduchová

Keyword(s):

Magnetic Field ◽

Numerical Simulation ◽

Field Distribution ◽

Induction Heating ◽

Electromagnetic Induction ◽

Magnetic Field Distribution ◽

The Magnetic Field ◽

Heated Material ◽

Ansys Workbench

In the paper is shown the connection of two toolboxes in an Ansys Workbench solution for induction heating. In Ansys Workbench, Maxwell electromagnetism programs and Fluent have been linked. In Maxwell, a simulation of electromagnetic induction was performed, where data on the magnetic field distribution in the heated material was obtained and then transformed into the Fluent program in which the induction heating simulation was performed.

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Effect of Magnetic Water Treatment on Prevention of CaCO3 Scales

Baghdad Science Journal ◽

10.21123/bsj.10.1.73-84 ◽

2013 ◽

Vol 10 (1) ◽

pp. 73-84

Author(s):

Baghdad Science Journal

Keyword(s):

Magnetic Field ◽

Calcium Carbonate ◽

Water Flow ◽

Permanent Magnets ◽

Thick Layer ◽

Total Dissolved Solids ◽

Magnetic Treatment ◽

Magnetic Strength ◽

Device Free ◽

The Magnetic Field

Permanent magnets of different intensities were used to investigate the effect of a magnetic field in the process of preventing deposits of calcium carbonate. The magnets were fixed on the water line from the tap outside. Then heating a sample of this water in flasks and measuring the amount of sediment in a manner weighted differences. These experiments comprise to the change of the velocity of water flow, which amounted to (0.5, 0.75, 1) m/sec through the magnetic fields that are of magnetic strength (2200, 6000, 9250, 11000) Gauss, and conduct measurements, tests and compare them with those obtained from the use of ordinary water.The results showed the effectiveness of magnetic treatment in reducing the rate of deposition of calcium carbonate where up to 60% after treatment, and this percentage is increasing with increasing magnetic field strength where up to 85% when the intensity of the magnetic field 9250 and 11000 Gauss at the velocity of the water flow of 0.75 m/sec. This percentage of reducing was investigated with increasing the velocity of flow of water through a magnetic field. Also the results showed an increase in total dissolved solids (TDS) as well as electrical conductivity and a decrease in the value of surface tension as a result of magnetic treatment.Observation with the photograph pictures of the distillation apparatus oriented in several laboratories, that the amount of sediment formed a thick layer in the device-free magnetic treatment, but it was not dense and in the few quantity in the apparatus treated with magnetic intensity (8000, 9250) Gauss.

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Static force characteristics of electromagnetic actuators for Braille screen

Facta universitatis - series Electronics and Energetics ◽

10.2298/fuee1102157y ◽

2011 ◽

Vol 24 (2) ◽

pp. 157-167 ◽

Cited By ~ 3

Author(s):

Ivan Yatchev ◽

Krastio Hinov ◽

Iosko Balabozov ◽

Kristina Krasteva

Keyword(s):

Magnetic Field ◽

Finite Element Method ◽

Finite Element ◽

Permanent Magnet ◽

Static Force ◽

The Finite Element Method ◽

Electromagnetic Actuators ◽

Minimum Force ◽

The Magnetic Field ◽

Force Characteristics

Several constructions of electromagnetic actuators with moving permanent magnet for Braille screen are studied. All they are formed from a basic one that consists of two coils, core and moving permanent magnet. The finite element method is used for modeling of the magnetic field and for obtaining the electromagnetic force acting on the mover. The static force-stroke characteristics are obtained for four different constructions of the actuator. The constructions with ferromagnetic disc between the coils ensure greater force than the ones without disc and can reach the required minimum force.

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Magnetic Recording Method (MRM) for Nondestructive Evaluation of Ferromagnetic Materials

Materials ◽

10.3390/ma15020630 ◽

2022 ◽

Vol 15 (2) ◽

pp. 630

Author(s):

Tomasz Chady ◽

Ryszard D. Łukaszuk ◽

Krzysztof Gorący ◽

Marek J. Żwir

Keyword(s):

Magnetic Field ◽

Magnetic Recording ◽

Permanent Magnets ◽

Steel Structure ◽

Standard Technique ◽

Magnetic Field Measurement ◽

Destructive Testing ◽

Recording Method ◽

Nondestructive Testing Method ◽

The Magnetic Field

This paper proposes and experimentally investigates a novel nondestructive testing method for ferromagnetic elements monitoring, the Magnetic Recording Method (MRM). In this method, the inspected element must be magnetized in a strictly defined manner before operation. This can be achieved using an array of permanent magnets arranged to produce a quasi-sinusoidal magnetization path. The magnetic field caused by the original residual magnetization of the element is measured and stored for future reference. After the operation or loading, the magnetic field measurement is repeated. Analysis of relative changes in the magnetic field (for selected components) allows identifying applied stress. The proposed research methodology aims to provide information on the steel structure condition unambiguously and accurately. An interpretation of the results without referring to the original magnetization is also possible but could be less accurate. The method can be used as a standard technique for NDT (Non-Destructive Testing) or in structural health monitoring (SHM) systems.

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Radio Emission Model of a 'Typical' Pulsar

Australian Journal of Physics ◽

10.1071/ph870755 ◽

1987 ◽

Vol 40 (6) ◽

pp. 755 ◽

Cited By ~ 10

Author(s):

AZ Kazbegi ◽

GZ Machabeli ◽

G Melikidze

Keyword(s):

Magnetic Field ◽

Electromagnetic Waves ◽

Emission Model ◽

Radio Waves ◽

Resonance Case ◽

Pulsar Magnetosphere ◽

Pulsar Emission ◽

Dipole Magnetic Field ◽

New Type ◽

The Magnetic Field

The generation of radio waves in the plasma of the pulsar magnetosphere is considered taking into account the inhomogeneity of the dipole magnetic field. It is shown that the growth rate of the instability of the electromagnetic waves calculated in the non-resonance case turns out to be of the order of 1/ TO (where TO is the time of plasma escape from the light cylinder). However, the generation of electromagnetic waves from a new type Cherenkov resonance is possible, occurring when the particles have transverse velocities caused by the drift due to the inhomogeneity of the magnetic field. Estimates show that the development of this type of instability is possible only for pulsars with ages which exceed 104 yr. We make an attempt to explain some peculiarities of 'typical' pulsar emission on the basis of the model developed.

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