The Analysis of Pressure Capability of Different Teeth Structures in Ferrofluid Seal

2010 ◽  
Vol 146-147 ◽  
pp. 1278-1284 ◽  
Author(s):  
Fei Fei Xing ◽  
De Cai Li ◽  
Wen Ming Yang
Keyword(s):  
Magnetic Field ◽  
Finite Element Method ◽  
Finite Element ◽  
Theoretical Model ◽  
Vector Potential ◽  
Potential Method ◽  
Magnetic Vector Potential ◽  
Magnetic Vector ◽  
Two Sides ◽  
Sealing Gap

Theoretical model of calculating magnetic field of typical ferrofluid sealing structures with magnetic vector potential method is built. Based on the theoretical model, magnetic field distribution of rectangular teeth, two-sides dilated shape and one-side dilated shape teeth structures with common other conditions were calculated using finite element method when the sealing gap was 0.1mm and 0.12mm. The comparison of their results with the same sealing gap showed that one-side dilated shape teeth structure had higher pressure capability than other shape teeth under reasonable design.

The Comparison of Magnetic Leakage of Different Teeth Structures in Magnetic Fluid Seal

2011 ◽  
Vol 197-198 ◽  
pp. 314-317 ◽  
Author(s):  
Fei Fei Xing ◽  
De Cai Li ◽  
Wen Ming Yang ◽  
Xiao Long Yang
Keyword(s):  
Magnetic Field ◽  
Finite Element Method ◽  
Finite Element ◽  
Theoretical Model ◽  
Field Distribution ◽  
Magnetic Fluid ◽  
Magnetic Field Distribution ◽  
Two Sides ◽  
The Magnetic Field ◽  
Sealing Gap

Based on the theoretical model, magnetic field distribution of rectangular teeth, two-sides dilated shape and one-side dilated shape teeth structure with common other conditions were calculated using finite element method when the sealing gap was 0.1mm and 0.12mm. The comparison of their results with the same sealing gap showed that rectangular teeth structure had the highest magnetic leakage. Moreover, the magnetic field distribution of sealing structures with rectangular stages on both the shaft and pole pieces under the same design and sealing gap were also calculated using the same method, whose result was compared with rectangular stages on pole pieces only. The comparison showed that the former did not have higher pressure capability obviously but led to higher magnetic leakage.

Harmonic Computation and Analysis of Nonlinear Magnetic Field in the Ferromagnetic Core of the Transformer

2014 ◽  
Vol 1003 ◽  
pp. 165-168
Author(s):  
Xiao Jun Zhao ◽  
Xiao Li Chen ◽  
Can Cui ◽  
Yu Ting Zhong
Keyword(s):  
Magnetic Field ◽  
Finite Element Method ◽  
Finite Element ◽  
Harmonic Analysis ◽  
Vector Potential ◽  
Single Phase ◽  
Magnetic Vector Potential ◽  
Magnetic Vector ◽  
Harmonic Solution ◽  
Ferromagnetic Core

The single-phase three-limb transformer is used to carry out experiments under sinusoidal and dc-biased excitations. The exciting currents and magnetic vector potential are computed simultaneously by the harmonic-balanced finite-element method. Harmonic analysis of the nonlinear magnetic field is presented based on the harmonic solution of the magnetic vector potential. The calculated exciting current agrees well with the measured result, which verifies the effectiveness of the proposed method.

scholarly journals MODELING OF ELECTROMAGNETIC FORCE WITH A MAGNETIC VECTOR POTENTIAL FORMULATION VIA A SUBPROBLEM FINITE ELEMENT METHOD

2020 ◽  
Vol 225 (02) ◽  
pp. 71-75
Author(s):  
Đặng Quốc Vương
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Electromagnetic Force ◽  
Vector Potential ◽  
Magnetic Vector Potential ◽  
Magnetic Vector ◽  
Potential Formulation ◽  
Element Method

Mục đích của nghiên cứu này được dựa trên phương pháp miền nhỏ hữu hạn với công thức véc tơ từ thế để phân tích lực điện từ tạo ra bởi sự phân bố của mật độ từ cảm tản trong khe hở không khí và mật độ dòng điện trong các cuộn dây, cái mà khó có thể thực hiện trực tiếp bằng phương pháp phần tử hữu hạn, khi mà một số vùng dẫn nghiên cứu có kích thước rất nhỏ so với toàn bộ miền nghiên cứu. Phương pháp bài toán nhỏ được áp dụng ở đây để liên kết các bài toán theo một vài  bước: Một bài toán với mô hình đơn giản (các cuộn dây) được giải trước. Bài toán tiếp theo bao gồm một hoặc nhiều miền dẫn từ được đưa vào để hiệu chỉnh sai số do bài toán trước đó gây ra. Tất cả các bước đều được giải độc lập trong lưới và miền hình học khác nhau, điều này tạo thuận lợi cho việc chia lưới cũng như tăng tốc độ tính toán của mỗi một bài toán nhỏ.

An Enhanced Multigrid Method for Fast Numerical Computation of the Magnetic Vector Potential

2010 ◽  
Vol 670 ◽  
pp. 311-317
Author(s):  
T. Arudchelvam ◽  
D. Rodger ◽  
S.R.H. Hoole
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Vector Potential ◽  
Computation Time ◽  
Grid Method ◽  
Magnetic Vector Potential ◽  
The Finite Element Method ◽  
Magnetostatic Field ◽  
Electromagnetic Problems ◽  
Element Method

An enhanced multi-grid method eliminating the error correction process of the conventional multi-grid method is presented for solving Poissonian problems and tested on two simple two-dimensional magnetostatic field problems. The finite element method (FEM) was used to solve for the vector potential in a sequence of grids. The gains in computation time are shown to be immense compared to the standard multi-grid methods, especially as the matrix system grows in size. These gains are very useful in solving electromagnetic problems using the finite element method.

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