scholarly journals A Vibration Similarity Model of Converter Transformers and Its Verification Method

Symmetry ◽  
2022 ◽  
Vol 14 (1) ◽  
pp. 143
Author(s):  
Hao Wang ◽  
Li Zhang ◽  
Youliang Sun ◽  
Guan Wang ◽  
Liang Zou
Keyword(s):  
Similarity Criterion ◽  
Reference Value ◽  
Coupling Model ◽  
Vibration Characteristics ◽  
Magnetic Flux Density ◽  
Verification Method ◽  
Distribution Shape ◽  
Similarity Model ◽  
Before And After ◽  
Flux Density Distribution

According to the vibration characteristics of converter transformers, considering the Maxwell equation, magnetostrictive effect, Lorentz force and structural mechanics, the similarity criterion suitable for converter transformers is deduced in this paper. Using the finite element simulation platform, the multi physical field coupling model of converter transformers is constructed, and the scale coefficient is 0.1. The magnetic flux density distribution, stress distribution, shape variable and vibration characteristics of the model before and after the similarity are analyzed. The results show that the variation law of the model before and after the similarity conforms to the similarity criterion, and the correctness of the similarity criterion is verified. The converter transformer vibration similarity model and its verification method can effectively reduce the unnecessary waste of resources before the preparation of converter transformers and have important reference value for the analysis and improvement of converter transformer vibration characteristics.

A Reformative Simulation Method of Motor Pole Core Vibration Characteristics

2013 ◽  
Vol 331 ◽  
pp. 118-123
Author(s):  
Tian Hui Ding ◽  
Yun Hua Chen ◽  
Lei Tian
Keyword(s):  
Reference Value ◽  
Simulation Method ◽  
Vibration Characteristics ◽  
New Method ◽  
Motor Design ◽  
Simulation Results ◽  
Vibration Performance

As to directing motor design, it is very important to make sure that the motor’s forecast of vibration performance has reference value. So, it must need motor’s parts vibration characteristics simulation results are so close to their characteristics. This paper puts forward a new simulation method of motor pole core vibration characteristics, this method includes setting anisotropy material attributes multipartite, getting attributes parameters values which are based on recommended fitting curves, modeling and equating windings, equating dipping lacquer and so on. Combining with experiments, the new method is validated its availability.

Modal-frequency spectrum of magnetic flux density in air gap of permanent magnet motor

2014 ◽  
Vol 63 (1) ◽  
pp. 29-46
Author(s):  
Pawel Witczak ◽  
Witold Kubiak ◽  
Marcin Lefik ◽  
Jacek Szulakowski
Keyword(s):  
Permanent Magnet ◽  
Flux Density ◽  
Frequency Spectrum ◽  
Air Gap ◽  
Magnetic Flux Density ◽  
Permanent Magnet Motors ◽  
Modal Frequency ◽  
Time Stepping ◽  
Sinusoidal Shape ◽  
Flux Density Distribution

Abstract The classic relationships concerning the harmonic content in the air gap field of three-phase machines are presented in form of series of rotating waves. The same approach is applied to modeling of permanent magnet motors with fractional phase windings. All main reasons of non-sinusoidal shape of flux density distribution, namely, magnets’ shape and their placement, slotting, magnetic saturation and eccentricity are also related to their counterparts in modal-frequency spectrum. The Fourier 2D spectrum of time-stepping finite element solution is confronted with results of measurements, with special attention paid to accuracy of both methods

Time Resolved Magneto-Optical Imaging in High Frequency AC Currents of YBa2Cu3O7-&[delta]Thin Films

2006 ◽  
Vol 946 ◽  
Author(s):  
Andrea Lucarelli ◽  
Alexander Frey ◽  
Ran Yang ◽  
Gunter Luepke ◽  
Timothy J Haugan ◽  
...  
Keyword(s):  
High Frequency ◽  
Imaging Study ◽  
Flux Creep ◽  
Magnetic Flux Density ◽  
Current Profile ◽  
Time Resolved ◽  
Sample Edge ◽  
Ac Current ◽  
High Frequency Ac ◽  
Flux Density Distribution

ABSTRACTWe present a time-resolved magneto-optical (MO) imaging study of high-temperature superconductor (HTS) in high-frequency alternating current (AC) regime. The evolution of the magnetic flux density distribution in YBa2Cu3O7-d (YBCO) thin film samples is studied in small steps of the phase of the applied AC current. The flux distribution at 10 K exhibits instabilities including flux jumps and flux creep. A quantitative analysis of the data allows us to obtain the current density evolution. The current profile changes considerably with the phase differently from the prediction of the critical state model. These observations can be explained by the higher self-field at the sample edge and the effects of flux creep.

scholarly journals Optimized And Numerical Models Of Electromechanical Devices Coupled With Computation Of Performance Characteristics

2015 ◽  
Vol 66 (1) ◽  
pp. 40-46 ◽  
Author(s):  
Vasilija Sarac ◽  
Tatjana Atanasova-Pacemska ◽  
Dragan Minovski ◽  
Goran Cogelja ◽  
Miroslava Smitková ◽  
...  
Keyword(s):  
Flux Density ◽  
Gradual Increase ◽  
Numerical Models ◽  
Input Power ◽  
Efficiency Factor ◽  
Magnetic Flux Density ◽  
The Finite Element Method ◽  
Warm Up ◽  
Low Efficiency ◽  
Flux Density Distribution

Abstract The method of genetic algorithms is used to optimize the efficiency factor of two objects: single a phase shaded pole motor and the main inductor for an LCL filter, aimed for independent operation. By varying the construction parameters, three motors and two inductor models have been designed and optimized. The optimized motors exhibited a gradual increase of the efficiency factor achieved for the same input power. Also an increased output power has been achieved, which considerably improved the low efficiency factor for this type of the motor. The optimized filter models have an increased efficiency due to the lower losses and a decreased warm-up. All models are evaluated by the finite element method, which allows to plot the magnetic flux density distribution in the cross section and hereby the possible weak parts of the construction with a high flux density can be discovered.

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