Analysis of Electromagnetic Field and Temperature Field in ESR Process with Three Electrodes

PRICM ◽  
2013 ◽  
pp. 3091-3098
Author(s):  
Fang Wang ◽  
Baokuan Li ◽  
Taiyin Gao
Keyword(s):  
Electromagnetic Field ◽  
Temperature Field

scholarly journals Influence of Rectifiers on Permanent Magnet Wind Generator Electromagnetic and Temperature Fields

2016 ◽  
Vol 10 (1) ◽  
pp. 205-219
Author(s):  
Qiu Hongbo ◽  
Dong Yu ◽  
Yang Cunxiang
Keyword(s):  
Electromagnetic Field ◽  
Temperature Field ◽  
Permanent Magnet ◽  
Core Loss ◽  
Harmonic Distortion ◽  
Temperature Fields ◽  
Stator Core ◽  
Current Harmonics ◽  
Copper Loss ◽  
Wind Generator

Power rectifiers are very necessary in the wind power generation systems since they are the necessary channels that link the generator and power gird together. However, they have some effects on the permanent magnet wind generator due to their work on fast on-off transitions. Taking an 8kW 2000r/min wind-driven permanent magnet generator as an example, the system model and external circuit were established. Firstly, based on the field-circuit coupling calculation method, the voltage and current harmonics have been studied respectively when the generator was connected to rectifier loads and pure resistance loads, so did the total harmonic distortion. The mechanism of harmonic impacted by rectifiers was revealed. Secondly, combined the harmonic electromagnetic field theory, the stator core loss, armature winding copper loss and rotor eddy loss were analyzed when the generator connected different loads. Furthermore, according to the definition of nonlinear circuits PF, the numerical analysis method was adopted to calculate the power factor when the generator connected two loads respectively. The change mechanism of PF impacted by rectifiers has been revealed. In addition, the temperature field model has been established and the generator temperature was also analyzed. The temperature distributions were obtained when the wind generator was connected to different loads. Then, the relationship between losses and temperature was combined, the change rules of permanent magnet temperature by the eddy current loss were studied under different load. At last, it can prove that the rectifiers have influences on both electromagnetic field and temperature field through comparing the simulation results with experimental test data.

Modeling Of Thermophysical Processes In The Case Of Surface Modifying Of Metal During Induction Treatment

2017 ◽  
Vol 12 (1) ◽  
pp. 91-96
Author(s):  
Vladimir Popov ◽  
Vladimir Shchukin
Keyword(s):  
Numerical Simulation ◽  
Electromagnetic Field ◽  
Surface Layer ◽  
Temperature Field ◽  
High Frequency ◽  
Induction Treatment ◽  
High Frequency Electromagnetic Field ◽  
Modes Of Processing

Process of modifying of the surface layer of metals under influence of high-frequency electromagnetic field was considered using numerical simulation. The temperature field and the size of modified region were determined at various modes of processing.

The No-Load Voltage Waveform and Damper Bar Temperature Computation of Integral Number Slots Large Hydro-Generator which the Number of Damper Bars per Pole Increased

2014 ◽  
Vol 488-489 ◽  
pp. 843-846
Author(s):  
Ru Yang ◽  
Hong Jun Li ◽  
Zhen Nan Fan
Keyword(s):  
Electromagnetic Field ◽  
Temperature Field ◽  
Coupling Model ◽  
Fe Model ◽  
Voltage Waveform ◽  
Load Voltage ◽  
Electric Network ◽  
Design Standard ◽  
Integral Number

In order to analyze the no-load voltage waveform and damper bars temperature of integral number slots large hydro-generator which the number of damper bars per pole increased, the 2D moving electromagnetic field-circuit coupling model of a 600MW integral number slots hydro-generator and 3D temperature field FE model of the rotor are established, and the no-load voltage waveforms and temperature are calculated. The research is helpful for improving design standard and enhancing the operation reliability of the large hydro-generator and electric network.

scholarly journals Research on the Electromagnetic-Heat-Flow Coupled Modeling and Analysis for In-Wheel Motor

2020 ◽  
Vol 11 (2) ◽  
pp. 29
Author(s):  
Haojie Xue ◽  
Di Tan ◽  
Shuaishuai Liu ◽  
Meng Yuan ◽  
Chunming Zhao
Keyword(s):  
Electromagnetic Field ◽  
Temperature Field ◽  
Flow Field ◽  
Weak Coupling ◽  
Working Condition ◽  
Electromagnetic Torque ◽  
Coupling Analysis ◽  
Field Coupling ◽  
Field Temperature ◽  
Coupling Factors

In this paper, a 15 KW in-wheel motor (IWM) is taken as the research object, and the coupling factors among the electromagnetic field, temperature field and flow field are analyzed, and the strong and weak coupling factors between the three fields are clarified, and by identifying the strong and weak coupling factors between the three fields, a three-field coupling analysis model for IWM with appropriate complexity is established, and the validity of the model is verified. In a certain driving condition, the electromagnetic field, temperature field and flow field characteristics of IWM are analyzed with the multi-field coupling model. The result shows that, after the IWM runs 8440 s under driving conditions, in this paper, the IWM electromagnetic torque of the rated working condition is 134.2 Nm, and IWM the electromagnetic torque of the peak working condition is 451.36 Nm, and the power requirement of the motor can be guaranteed. The highest temperature of the IWM is 150 °C, which does not exceed the insulation grade requirements of the motor (155 °C), the highest temperature of the permanent magnet (PM) is 65.6 °C, and it does not exceed the highest operating temperature of the PM, and ensures the accurate calculation of components loss and the temperature of the motor. It can be found, through research, that the electromagnetic torque difference between unidirectional coupling and bidirectional coupling is 3.2%, the maximum temperature difference is 7.98% in the three-field coupling analysis of IWM under rated working conditions. Therefore, it is necessary to consider the influence of coupling factors on the properties of motor materials when analyzing the electromagnetic field, temperature field and flow field of IWM; it also provides some reference value for the simulation analysis of IWM in the future.

Experimental and Numerical Study of the Influence of a Low-Frequency Electromagnetic Field on the As-Cast Structure of Horizontal Direct Chill Casting Aluminum Alloy Slab

2009 ◽  
Vol 79-82 ◽  
pp. 1265-1268
Author(s):  
Zhi Hao Zhao ◽  
Jian Zhong Cui ◽  
Qing Feng Zhu ◽  
Gao Song Wang
Keyword(s):  
Electromagnetic Field ◽  
Aluminum Alloy ◽  
Temperature Field ◽  
Flow Pattern ◽  
Low Frequency ◽  
Direct Chill ◽  
Chill Casting ◽  
Cast Structure ◽  
Casting Aluminum Alloy ◽  
Casting Aluminum

The influences of low frequency electromagnetic field on the as-cast structure of horizontal direct chill casting aluminum alloy slab were experimental and numerical studied. The results of numerical analysis show that the interaction of the low-frequency electromagnetic field and the melt can generate an electromagnetically induced forced flow in the melt, which, in turn, changes flow pattern and temperature field in the mold. the as-cast structure of slab can be greatly improved by the changes of flow pattern and temperature field. The results of experimental analysis show that the grains of low frequency electromagnetic casting (LFEC) are fine, uniform, equiaxed, rosette-shaped; the surface of the slab of LFEC has no cold shut and less exudations. Moreover, the low-frequency electromagnetic field can improve the distribution of solute elements in the slab. The macrosegregation such as negative segregation and gravity segregation were reduced, which results in the homogenous distributions of the solute elements over the cross-section of the slab.

Calculation and analysis of the loss and heat on damper bars in large tubular hydro-generator

2013 ◽  
Vol 62 (1) ◽  
pp. 43-54 ◽  
Author(s):  
Yong Liao ◽  
Zhen-Nan Fan ◽  
Li Han ◽  
Li-Dan Xie
Keyword(s):  
Electromagnetic Field ◽  
Temperature Field ◽  
Heat Conduction ◽  
Heat Dissipation ◽  
Operating Conditions ◽  
Fe Model ◽  
Time Varying ◽  
Rotor Core ◽  
Anisotropic Heat Conduction ◽  
Generator Design

Abstract In order to research the losses and heat of damper bars thoroughly, a multislice moving electromagnetic field-circuit coupling FE model of tubular hydro-generator and a 3D temperature field FE model of the rotor are built respectively. The factors such as rotor motion and non-linearity of the time-varying electromagnetic field, the stator slots skew, the anisotropic heat conduction of the rotor core lamination and different heat dissipation conditions on the windward and lee side of the poles are considered. Furthermore, according to the different operating conditions, different rotor structures and materials, compositive calculations about the losses and temperatures of the damper bars of a 36 MW generator are carried out, and the data are compared with the test. The results show that the computation precision is satisfied and the generator design is reasonable.

Numerical Simulation of Temperature Field in Barrel of Injection Molding Machine during Induction Heating Process Based on ANSYS Software

2009 ◽  
Vol 87-88 ◽  
pp. 16-21 ◽  
Author(s):  
Shi Jia Chang ◽  
Peng Cheng Xie ◽  
Xue Tao He ◽  
Wei Min Yang
Keyword(s):  
Electromagnetic Field ◽  
Temperature Field ◽  
Injection Molding ◽  
Induction Heating ◽  
Heating Process ◽  
Magnetic Vector Potential ◽  
Ansys Software ◽  
Molding Machine ◽  
Injection Molding Machine ◽  
Field Problem

A finite element model of temperature field coupled with electromagnetic field has been established based on induction heating theory including Maxwell’s equations, thermal conductivity differential equation and magnetic vector potential to simulate the induction heating process of barrel of injection molding machine by universal ANSYS software, and to obtain temperature field of the barrel related to time variation. The coupled thermal and electromagnetic field problem taking account of nonlinear materials characteristics related to temperature was discussed. The induction heating process of barrel was analyzed, and the temperature distribution and its variation with time were obtained.

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