Magnetic Flux Density under Single Harmonic Distortion

2021 ◽  
Vol 1034 ◽  
pp. 151-157
Author(s):  
Michał Kaczmarek ◽  
Ernest Stano
Keyword(s):  
Magnetic Flux ◽  
Flux Density ◽  
Phase Angle ◽  
Harmonic Distortion ◽  
Magnetic Core ◽  
Magnetic Flux Density ◽  
Higher Harmonics ◽  
Secondary Voltage ◽  
Magnetizing Current ◽  
Higher Harmonic

In the paper the change of the magnetic flux density under single harmonic distortion is discussed. Presented results show the dependence of the value of the magnetic flux density in the toroidal magnetic core made from the Ni80Fe20 tape of the phase angle of higher harmonic in relation to the main harmonic of distorted magnetizing current. Moreover, the influence of higher harmonic depends from it frequency and it becomes undetectable above 15th higher harmonic, even if its level reaches 50% of the RMS value of the main harmonic of distorted magnetizing current. Laboratory tests were carried out for the magnetic toroidal core of iCT with a current ratio equal to 300 A / 5 A. The oscilloscope is used to measure waveforms of the excitation current and the secondary voltage through the voltage probes. Build in numerical integration is used to determine the magnetic flux density from secondary voltage. In the case of tested 5th higher harmonic the highest value of the magnetic flux density is obtained for phase angle equal to 90° between main and higher harmonics, while the lowest is obtained for 270°. This depends from the initial phase of the magnetic field strength and results from the integration of distorted secondary voltage with the particular content of higher harmonics.

scholarly journals Lamination effects on a 3D model of the magnetic core of power transformers

Open Physics ◽  
2017 ◽  
Vol 15 (1) ◽  
pp. 997-1003
Author(s):  
Antonio Poveda-Lerma ◽  
Guillermo Serrano-Callergues ◽  
Martin Riera-Guasp ◽  
Manuel Pineda-Sanchez ◽  
Ruben Puche-Panadero ◽  
...  
Keyword(s):  
Magnetic Flux ◽  
Flux Density ◽  
Experimental Tests ◽  
Butt Joint ◽  
Magnetic Core ◽  
Magnetic Flux Density ◽  
Lap Joint ◽  
3D Fem ◽  
Average Value ◽  
Depth Direction

AbstractIn this paper the lamination effect on the model of a power transformer’s core with stacked E-I structure is analyzed. The distribution of the magnetic flux in the laminations depends on the stacking method. In this work it is shown, using a 3D FEM model and an experimental prototype, that the non-uniform distribution of the flux in a laminated E-I core with alternate-lap joint stack increases substantially the average value of the magnetic flux density in the core, compared with a butt joint stack. Both the simulated model and the experimental tests show that the presence of constructive air-gaps in the E-I junctions gives rise to a zig-zag flux in the depth direction. This inter-lamination flux reduces the magnetic flux density in the I-pieces and increases substantially the magnetic flux density in the E-pieces, with highly saturated points that traditional 2D analysis cannot reproduce. The relation between the number of laminations included in the model, and the computational resourses needed to build it, is also evaluated in this work.

Relationship between F Value and Slag Entrapment in Mold with Electromagnetic Brake

2012 ◽  
Vol 182-183 ◽  
pp. 462-466
Author(s):  
Zhen Qiang Zhang ◽  
Zuo Sheng Lei ◽  
Zhan Yu ◽  
Zhong Ming Ren ◽  
Kang Deng
Keyword(s):  
Magnetic Flux ◽  
Flux Density ◽  
Liquid Steel ◽  
Magnetic Core ◽  
Magnetic Flux Density ◽  
Level Fluctuation ◽  
Occurrence Probability ◽  
Electromagnetic Brake ◽  
Steel Flow ◽  
Slag Entrapment

An experimental device is designed to control slag entrapment of molten steel with ElectroMagnetic Brake(EMBR). Mercury was taken to simulate the liquid steel flow in the mold. The factors which affect slag entrapment with EMBR are studied, such as position of magnets, distribution of magnetic flux density and submerged depth of Nozzle. Experimental results show that the posibility of power entrapped by liquid steel was smallest as magnetic flux density B=0.3T, meanwhile, it was found that F value decreases with increasing immersion depth. Indeed, the occurrence probability of the slag entrapment decreases while d=45 mm (d is distance from the centre of SEN to the centreline of magnetic core.) instead of d=25 mm. The submerged depth within 30~50 mm are suitable to the level fluctuation in EMBR conditions in this experiment.

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

Sensors ◽  
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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