scholarly journals Design and Cosimulation of Twelve-Pole Heteropolar Radial Hybrid Magnetic Bearing

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Zhixian Zhong ◽  
Yijian Duan ◽  
Zhonghou Cai ◽  
Yanying Qi
Keyword(s):  
Magnetic Circuit ◽  
Dynamic Stiffness ◽  
Fem Analysis ◽  
Magnetic Bearing ◽  
Low Power Consumption ◽  
The Finite Element Method ◽  
Small Coupling ◽  
Effective Combination ◽  
D Model ◽  
Force Characteristics

This paper presents a twelve-pole heteropolar radial hybrid magnetic bearing (HRHMB) structure. Firstly, the structure and equivalent magnetic circuit (EMC) are designed. And the radial electromagnetic force characteristics are calculated by the EMC model. At the same time, the rationality of EMC model is verified by the finite-element method (FEM) of Magnet software. Then, the 2-D model of the twelve-pole HRHMB is established in Magnet software. The flux density variations of twelve-pole HRHMB and eight-pole HRHMB under different currents are compared by using the FEM. Finally, a method of Magnet-Simulink cosimulation is proposed to analyze the suspension characteristics of the twelve-pole HRHMB and compared with the eight-pole HRHMB. Thus, the effective combination of theoretical analysis, FEM analysis, and Magnet-Simulink cosimulation analysis is realized in the design of HRHMB. The results of Magnet-Simulink cosimulation show that the twelve-pole HRHMB has the advantages of low power consumption, small coupling, large construction dynamic stiffness, and better suspension characteristics than the eight-pole HRHMB.

Calculation of Leakage Coefficient for Hybrid Magnetic Bearing

2012 ◽  
Vol 150 ◽  
pp. 17-23 ◽  
Author(s):  
Er Yong Hou ◽  
Kun Liu
Keyword(s):  
Mathematical Model ◽  
Finite Element ◽  
Magnetic Circuit ◽  
Element Model ◽  
Practical Method ◽  
Magnetic Bearing ◽  
The Finite Element Method ◽  
Magnetic Forces ◽  
Working Principle ◽  
Leakage Coefficient

This paper proposes a novel radial hybrid magnetic bearing (RHMB), whose configuration and working principle are introduced, and its mathematical model is built using the equivalent magnetic circuit method. A simple and practical method for calculating leakage coefficients is proposed to improve the accuracy of the equivalent magnetic circuit method. A 3-D finite element model of the RHMB is established by the software ANSYS and the leakage coefficients of control and bias fluxes are calculated, respectively. Based on the obtained leakage coefficients, magnetic forces on the rotor are calculated using the equivalent magnetic circuit method, and the results are compared with those of experiments and the finite element method. It shows that the magnetic forces obtained using the three methods are in agreement with each other, which verifies the correction of the proposed method in the calculation of leakage coefficients.

Calculation and Verification of Magnetic Field Parameters in Axial Active Magnetic Bearing

2014 ◽  
Vol 214 ◽  
pp. 143-150
Author(s):  
Piotr Graca
Keyword(s):  
Magnetic Field ◽  
Finite Element Method ◽  
Magnetic Force ◽  
Magnetic Bearing ◽  
Active Magnetic Bearing ◽  
Magnetic Flux Density ◽  
Two Dimensional ◽  
The Finite Element Method ◽  
Magnetic Field Computation

The paper presents numerical modeling of an Axial Active Magnetic Bearing (AAMB) based on two-dimensional (2D) magnetic field computation. The calculations, assisted by the Finite Element Method (FEM), have focused on the determination of the magnetic flux density and the magnetic force. Obtained magnetic field parameters were then measured and verified on a physical model.

scholarly journals A Metawindow with Optimised Acoustic and Ventilation Performance

2021 ◽  
Vol 11 (7) ◽  
pp. 3168
Author(s):  
Gioia Fusaro ◽  
Xiang Yu ◽  
Zhenbo Lu ◽  
Fangsen Cui ◽  
Jian Kang
Keyword(s):  
Natural Ventilation ◽  
Noise Control ◽  
Fem Analysis ◽  
The Finite Element Method ◽  
Noise Mitigation ◽  
Acoustic Performance ◽  
Potential Applications ◽  
Ventilation Performance ◽  
Sound Reduction ◽  
Window Design

Crucial factors in window performance, such as natural ventilation and noise control, are generally conceived separately, forcing users to choose one over the other. To solve this dualism, this study aimed to develop an acoustic metamaterial (AMM) ergonomic window design to allow noise control without dependence on the natural ventilation duration and vice versa. First, the finite element method (FEM) was used to investigate the noise control performance of the acoustic metawindow (AMW) unit, followed by anechoic chamber testing, which also served as the validation of the FEM models. Furthermore, FEM analysis was used to optimise the acoustic performance and assess the ventilation potential. The numerical and experimental results exhibited an overall mean sound reduction of 15 dB within a bandwidth of 380 to 5000 Hz. A good agreement between the measured and numerical results was obtained, with a mean variation of 30%. Therefore, the AMW unit optimised acoustic performance, resulting in a higher noise reduction, especially from 50 to 500 Hz. Finally, most of the AMW unit configurations are suitable for natural ventilation, and a dynamic tuned ventilation capacity can be achieved for particular ranges by adjusting the window’s ventilation opening. The proposed designs have potential applications in building acoustics and engineering where natural ventilation and noise mitigation are required to meet regulations simultaneously.

Elastic-Plastic FEM Analysis of Deformations of a Cylinder Subjected to Severe Uniaxial and Bilateral Compression by Flat Plates

1991 ◽  
Author(s):  
M. Gotoh ◽  
Y. Shibata
Keyword(s):  
Compressive Force ◽  
Fem Analysis ◽  
Plane Stress State ◽  
Deformation Pattern ◽  
Lateral Compression ◽  
The Finite Element Method ◽  
Ring Plane ◽  
Flat Plates ◽  
Elastic Plastic ◽  
Plastic Forming

Abstract Uni-lateral and bi-lateral elastic-plastic compressions of a circular cylinder with three different wall thicknesses by flat plates are numerically analysed by the Finite Element Method (FEM). J2-flow theory (J2F), and J2-Gotoh’s corner theory (J2G) which was previously proposed by one of the authors are used as the constitutive equations. In the case of uni-lateral compression, the cylinder is compressed up to a completely flattened shape, which is considered a kind of plastic forming processes. The deformed shapes and the compressive force are predicted better by J2G than by J2F. The spring-back behaviours are also analysed by imposing unloading process during deformation. The deformation process in the compression of a ring (plane stress state) and a spherical shell (axi-symmetric state) is also analysed. In the case of bi-lateral compression, the process is considered a kind of square-tube forming. In its final stage, the cylinder deforms into a completely unexpected shape which could be thought of as a square tube reinforced with ribs. The J2G allows the process to proceed at a lower compressive force than that for J2F. The effect of n-value (the strain-hardedning exponent) on the deformation pattern is also discussed.

Magnetic circuit designing and structural optimisation for a three degree‐of‐freedom hybrid magnetic bearing

2018 ◽  
Vol 12 (8) ◽  
pp. 1082-1089 ◽  
Author(s):  
Zhang Xu ◽  
Liu Xu ◽  
Han Bangcheng ◽  
Ye Xiangyang
Keyword(s):  
Magnetic Circuit ◽  
Magnetic Bearing ◽  
Degree Of Freedom ◽  
Structural Optimisation ◽  
Three Degree Of Freedom

Problems of FEM Analysis of Magnetic Circuit

2014 ◽  
pp. 299-305
Author(s):  
J. Roupec ◽  
M. Kubik ◽  
I. Mazůrek ◽  
Z. Strecker
Keyword(s):  
Magnetic Circuit ◽  
Fem Analysis

scholarly journals Static force characteristics of electromagnetic actuators for Braille screen

2011 ◽  
Vol 24 (2) ◽  
pp. 157-167 ◽  
Author(s):  
Ivan Yatchev ◽  
Krastio Hinov ◽  
Iosko Balabozov ◽  
Kristina Krasteva
Keyword(s):  
Magnetic Field ◽  
Finite Element Method ◽  
Finite Element ◽  
Permanent Magnet ◽  
Static Force ◽  
The Finite Element Method ◽  
Electromagnetic Actuators ◽  
Minimum Force ◽  
The Magnetic Field ◽  
Force Characteristics

Several constructions of electromagnetic actuators with moving permanent magnet for Braille screen are studied. All they are formed from a basic one that consists of two coils, core and moving permanent magnet. The finite element method is used for modeling of the magnetic field and for obtaining the electromagnetic force acting on the mover. The static force-stroke characteristics are obtained for four different constructions of the actuator. The constructions with ferromagnetic disc between the coils ensure greater force than the ones without disc and can reach the required minimum force.

scholarly journals Wind or Hydro Homo-Heteropolar Synchronous Generators: Equivalent Magnetic Circuit and FEM Analysis

2018 ◽  
Vol 210 ◽  
pp. 02008
Author(s):  
Sorin Ioan Deaconu ◽  
Marcel Topor ◽  
Lucian Nicolae Tutelea ◽  
Ilie Nucă ◽  
Marcel Burduniuc
Keyword(s):  
Low Power ◽  
Magnetic Circuit ◽  
Low Cost ◽  
Fem Analysis ◽  
Synchronous Machine ◽  
Preliminary Design ◽  
Synchronous Generators ◽  
3D Fem ◽  
Electric Wind

In an effort to introduce a low cost (PM less), low power electric wind or hydro generators, this paper reports on preliminary design aspects, equivalent magnetic circuit and 3D FEM analysis of a 2.5 KVA, 250-1000 rpm, reactive homo-heteropolar brushless synchronous machine (RHHBSM).

Microvia Formation for Multi-Layer PWB by Laser Direct Drilling: Improvement of Hole Quality by Silica Fillers in Build-Up Layer

2011 ◽  
Author(s):  
Keiji Ogawa ◽  
Toshiki Hirogaki ◽  
Eiichi Aoyama ◽  
Kuniyoshi Obata ◽  
Tsukasa Ayuzawa
Keyword(s):  
Copper Foil ◽  
Fem Analysis ◽  
Printed Wiring Boards ◽  
The Finite Element Method ◽  
Silica Filler ◽  
Silica Fillers ◽  
Via Holes ◽  
Overhang Length ◽  
Novel Method ◽  
Direct Drilling

Microvia formation technology using lasers has become the dominant method for drilling microvia called blind via-holes (BVHs) in printed wiring boards (PWBs). Laser direct drilling (LDD), drilling directly outer copper foil by laser, has attracted attention as a novel method. In particular, when copper and resin with different processing thresholds are drilled at the same time, an overhang defect occurs on the drilled hole. However, the overhang generation mechanism has not been clarified. Therefore, we investigated it by detailed observation of the drilled-hole section. Moreover, the overhang length was estimated using the finite element method (FEM). Influences of surface treatment of outer copper foil and thermal properties of the build-up layer were evaluated experimentally and analytically. Consequently, an experiment with a prototype PWB with silica filler added in the build-up layer was carried out. Using the prototype PWBs, the overhang was reduced as shown in FEM analysis results.

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