Experiment and Simulation of Eddy-Current Loss inside Copper Shielding of Transformers under DC Biasing Condition

2011 ◽  
Vol 304 ◽  
pp. 41-47 ◽  
Author(s):  
Zhi Gang Zhao ◽  
Fu Gui Liu ◽  
You Hua Wang ◽  
Peng Xiang Ren ◽  
Yu Huai Kan
Keyword(s):  
Eddy Current ◽  
Three Dimensional ◽  
Eddy Current Loss ◽  
Copper Plate ◽  
Current Loss ◽  
Local Loss ◽  
Ac Power ◽  
Dc Biasing ◽  
Transformer Core ◽  
Excitation Conditions

With the advent of power electronic technology, the excitation conditions applied to transformers, motors, etc. could be very atypical. DC bias excitation is an undesired working condition of AC power transformers, the asymmetrical saturation of the transformer core, the heavy noise, the serious vibration, and the local loss concentration can all potentially occurred in dc-biased transformers. The effect of the exciting current under different dc-biased magnetization on eddy-current loss in copper plate based on a reduced engineering-oriented benchmark model (TEAM Problem 21) is investigated. Experiment scheme for dc biasing is presented and the distribution of the eddy current loss under different dc-biased excitation conditions was studied in detail. The engineering applicability of three dimensional eddy current analysis methods for dc-biased magnetization field computation and the practical loss modeling are examined, which has been demonstrated via the numerical modeling results and the measured data.

scholarly journals An Alternative Method for Calculating the Eddy Current Loss in the Sleeve of a Sealless Pump

Actuators ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 78
Author(s):  
Tomislav Strinić ◽  
Bianca Wex ◽  
Gerald Jungmayr ◽  
Thomas Stallinger ◽  
Jörg Frevert ◽  
...  
Keyword(s):  
Eddy Current ◽  
Three Dimensional ◽  
Eddy Current Loss ◽  
Theoretical Background ◽  
Air Gap ◽  
Magnetic Flux Density ◽  
Pump Impeller ◽  
Current Loss ◽  
Faraday’S Law ◽  
Transient Simulations

A sealless pump, also known as a wet rotor pump or a canned pump, requires a stationary sleeve in the air gap to protect the stator from a medium that flows around the rotor and the pump impeller. Since the sleeve is typically made from a non-magnetic electrically conductive material, the time-varying magnetic flux density in the air gap creates an eddy current loss in the sleeve. Precise assessment of this loss is crucial for the design of the pump. This paper presents a method for calculating the eddy current loss in such sleeves by using only a two-dimensional (2D) finite element method (FEM) solver. The basic idea is to use the similar structure of Ampère’s circuital law and Faraday’s law of induction to solve eddy current problems with a magnetostatic solver. The theoretical background behind the proposed method is explained and applied to the sleeve of a sealless pump. Finally, the results obtained by a 2D FEM approach are verified by three-dimensional FEM transient simulations.

Thermal Analysis of Canned Induction Motor for Coolant Pump Considering the Eddy Current Loss in Cans

2010 ◽  
Vol 670 ◽  
pp. 466-476 ◽  
Author(s):  
Jian Li ◽  
Jung Tae Song ◽  
Yun Hyun Cho
Keyword(s):  
Thermal Analysis ◽  
Finite Element ◽  
Induction Motor ◽  
Eddy Current ◽  
Three Dimensional ◽  
Eddy Current Loss ◽  
Time Step ◽  
Coolant Pump ◽  
Current Loss ◽  
Canned Motor

This paper describes thermal analysis of canned induction motor for coolant pump considering eddy current loss. The electromagnetic field of a canned motor was analyzed by using the time-step finite element method, and the eddy loss was obtained. Equivalent circuit considering can loss was developed and the equitation to calculate can loss was derived from theory of conventional motor. Using the loss from electromagnetic analysis as heat source of temperature field, thermal analysis was conducted by three dimensional finite element analyses. The simulation results show good agreement with experiment data, which indicates that this method has good accuracy and reliability for dealing with thermal behavior of canned motor.

scholarly journals Analysis of eddy current loss in magnetic coupling based on three-dimensional finite element calculation

2021 ◽  
Vol 2093 (1) ◽  
pp. 012039
Author(s):  
Xiaoyue Wang ◽  
Liang Cai ◽  
Yanqin Mao ◽  
Wanjun Guo
Keyword(s):  
Finite Element ◽  
Eddy Current ◽  
Three Dimensional ◽  
Magnetic Coupling ◽  
Eddy Current Loss ◽  
Finite Element Calculation ◽  
Element Calculation ◽  
Current Loss ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

Abstract Considering the end effect, the three-dimensional finite element calculation model of the magnetic coupling is established. The three-dimensional distribution nephogram of the induced current and eddy current loss on the isolation cover is obtained, and the distribution trends of the two are consistent. The influence of size, material, and operating condition of magnetic coupling on eddy current loss is studied. The results show that the selection of isolation material with high resistivity and the reduction of isolation thickness are helpful to reduce the eddy current loss. The higher the rotating speed of the magnetic coupling, the greater the eddy current loss. At the same speed, the greater the load, the greater the magnetic declination, the smaller the eddy current loss. The research results can provide a reference for reducing energy loss and cooling structure design of magnetic coupling.

Development of in-wheel magnetic-geared motor for walking support machines

2020 ◽  
Vol 64 (1-4) ◽  
pp. 157-163
Author(s):  
Koki Ito ◽  
Takahisa Kadomatsu ◽  
Kohei Obana ◽  
Kenji Nakamura
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Eddy Current ◽  
Three Dimensional ◽  
Eddy Current Loss ◽  
Experimental Results ◽  
3D Fem ◽  
Current Loss ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

This paper deals with development of in-wheel magnetic-geared motor for walking support machines. In a previous paper, a magnetic-geared motor for a walking support machine was prototyped. However, its efficiency was low, therefore improving the efficiency is necessary for practical use. This paper presents the improving efficiency of the magnetic-geared motor from the viewpoint of torque increasing and loss reducing by using a three-dimensional finite element method (3D-FEM). In addition, supporting method of pole-pieces and eddy current loss in housing were discussed. Furthermore, the proposed motor is prototyped. The experimental results show that its efficiency is 15% higher than the previous motor. Finally, the walking support machine installed with two magnetic-geared motors is prototyped and demonstrated.

Three-Dimensional Eddy Current Loss Modeling in Steel Laminations of Skewed Induction Machines

2013 ◽  
Vol 49 (5) ◽  
pp. 2033-2036 ◽  
Author(s):  
Paul Handgruber ◽  
Andrej Stermecki ◽  
Oszkar Biaro ◽  
Georg Ofner
Keyword(s):  
Eddy Current ◽  
Three Dimensional ◽  
Induction Machines ◽  
Eddy Current Loss ◽  
Current Loss ◽  
Loss Modeling

scholarly journals Research on Electromagnetic Field, Eddy Current Loss and Heat Transfer in the End Region of Synchronous Condenser with Different End Structures and Material Properties

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4636
Author(s):  
Xiaoshuai Bi ◽  
Likun Wang ◽  
Fabrizio Marignetti ◽  
Minghao Zhou
Keyword(s):  
Heat Transfer ◽  
Electromagnetic Field ◽  
Eddy Current ◽  
Three Dimensional ◽  
Eddy Current Loss ◽  
Transfer Model ◽  
Current Loss ◽  
Synchronous Condenser ◽  
Transient Electromagnetic ◽  
Copper Shield

Aiming at the problem of end structure heating caused by the excessive eddy current loss of large synchronous condensers used in ultra-high voltage (UHV) power transmission, combined with the actual operation characteristics of the synchronous condenser, a three-dimensional transient electromagnetic field physical model is established, and three schemes for adjusting the end structure of the condenser under rated condition are researched. The original structure has a copper shield and a steel clamping plate. Scheme 1 has no copper shield but has a steel clamping plate. Scheme 2 has no copper shield but has an aluminum clamping plate. By constructing a three-dimensional fluid–solid coupling heat transfer model in the end of the synchronous condenser, and giving the basic assumptions and boundary conditions, the eddy current loss of the structure calculated by the three schemes is applied to the end region of the synchronous condenser as the heat source, and the velocity distribution of the cooling medium and the temperature distribution of each structure under the three different schemes are obtained. In order to verify the rationality of the numerical analysis model and the effectiveness of the calculation method, the temperature of the inner edge of the copper shield in the end of the synchronous condenser is measured, and the temperature calculation results are consistent with the temperature measurement results, which provides a theoretical basis for the electromagnetic design, structural optimization, ventilation and cooling of the synchronous condenser.

Three-dimensional optimization of meander inductor

2020 ◽  
Vol 64 (1-4) ◽  
pp. 343-350
Author(s):  
Takahiro Sasaki ◽  
Hajime Igarashi
Keyword(s):  
Eddy Current ◽  
High Frequency ◽  
Three Dimensional ◽  
Optimization Method ◽  
Magnetic Core ◽  
Eddy Current Loss ◽  
Current Loss ◽  
Micro Genetic Algorithm ◽  
Meander Line ◽  
Dimensional Optimization

This paper presents a three-dimensional optimization method of a meander inductor for high-frequency circuits. The proposed method determines the structure of the meander line using the micro-genetic algorithm in which the eddy current loss and inductance are evaluated by finite element method. It is shown that the total loss composed of the eddy current loss in the magnetic core and Joule loss in the meander line is successfully minimized keeping the inductance to the specified value by this optimization.

Optimal Design of Tank Shield of an Electrical Locomotive Main Transformer Based on 3-D Eddy Current Analysis

2008 ◽  
Author(s):  
L. Dai ◽  
L. Luo
Keyword(s):  
Optimal Design ◽  
Eddy Current ◽  
Three Dimensional ◽  
Fem Analysis ◽  
Eddy Current Loss ◽  
Transformer Oil ◽  
Optimal Model ◽  
Current Loss ◽  
Leakage Field ◽  
Oil Tank

This research focuses on the optimal design of the transformer oil tank shield of an electrical locomotive which has the operating speed of 160km/h. The analysis of 3-D eddy current loss in the magnetic leakage field of the tank shield is performed in the research. The optimization of the three-dimensional geometry of the tank shield is also carried out. Based on the analysis of 3-D eddy current loss in the magnetic leakage field of the tank of the main transformer for 200km/h electrical locomotive, an optimal model of the tank shield of the transformer is developed and optimized by using the algorithm of sub-problem approach. The research results show that it is efficient to combine the optimized algorithm with the FEM analysis in optimizing the design of electromagnetic equipment.

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