Nonlinear Modeling and Analysis of Electromagnetic Bearings With Permanent Magnets for Bias

2012 ◽  
Author(s):  
Peiman Naseradinmousavi ◽  
C. Nataraj ◽  
Matthew Frank
Keyword(s):  
Permanent Magnets ◽  
Magnetic Circuit ◽  
Nonlinear Modeling ◽  
Nonlinear Function ◽  
High Fidelity ◽  
The Finite Element Method ◽  
Modeling And Analysis ◽  
Magnetic Forces ◽  
Simplifying Assumptions ◽  
Insight Into

This article describes high fidelity modeling of electromagnetic (EM) bearings with permanent magnets (PM) used to supply bias current. We analyze both the PM and EM parts of the system. Magnetic circuit theory is first used to gain insight into the magnetic forces and allows for the dynamic analysis of a rigid rotor coupled with the magnetic bearings. The results reveal that the magnetic forces are a strong nonlinear function of the rotor offsets from its equilibrium position. Next, the validity of the simplifying assumptions is examined with the aid of the finite element method. Comparisons of the magnetic forces are presented and discussed.

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.

MAIN CHARACTERISTICS ELECTRIC VIBRATORS BASED ON A LINEAR MOTOR WITH PERMANENT MAGNETS

2021 ◽  
Vol 4 (3) ◽  
pp. 4-10
Author(s):  
Kamoliddin Oqyolov ◽  
◽  
Nurzod Abduqodirov ◽  
Gulnoza Jalilova ◽  
Nuriddin Abduxakimov
Keyword(s):  
Magnetic Field ◽  
Permanent Magnets ◽  
Experimental Studies ◽  
Calculated Data ◽  
Linear Motor ◽  
Stator Winding ◽  
The Finite Element Method ◽  
Magnetic Forces ◽  
Electro Magnetic ◽  
The Magnetic Field

The design of an electric vibrator created on the basis of a linear motor with permanent magnets is considered, and the calculation of the magnetic field and the electromagnetic force acting on the motor armature is performed by the finite element method. The results of experimental studies confirming the reliability of the obtained calculated data are presented]. The purpose of this work is to study the distribution of the magnetic field and the electro-magnetic forces in a coaxial-linear permanent magnet electric motor (PM), which is the basis for the creation of avibration installationKeywords: vibration, magnets, magnetic induction, stator winding, electric vibrator

scholarly journals MODELING AND ANALYSIS OF HALBACH MAGNETIZED PERMANENT-MAGNETS MACHINE BY USING LUMPED PARAMETER MAGNETIC CIRCUIT METHOD

2015 ◽  
Vol 41 ◽  
pp. 177-188 ◽  
Author(s):  
Guohai Liu ◽  
Mingming Shao ◽  
Wenxiang Zhao ◽  
Jinghua Ji ◽  
Qian Chen ◽  
...  
Keyword(s):  
Permanent Magnets ◽  
Magnetic Circuit ◽  
Modeling And Analysis ◽  
Lumped Parameter

Magnetically Actuated, Circular Diaphragm Pumps Fabricated With Low-Temperature, Co-Fired Ceramic Tapes and Kapton Polyimide Films: Experiments and Theory

2001 ◽  
Author(s):  
Moon Kim ◽  
G. K. Ananthasuresh ◽  
Haim H. Bau
Keyword(s):  
Low Temperature ◽  
Permanent Magnets ◽  
Polyimide Film ◽  
Design Parameters ◽  
The Finite Element Method ◽  
Polyimide Films ◽  
Magnetic Forces ◽  
Magnetically Actuated ◽  
Circular Diaphragm ◽  
Ltcc Substrate

Abstract Magnetically actuated diaphragm pumps were fabricated with low temperature co-fired ceramic (LTCC) tapes and Kapton polyimide film. The pumps consisted of a chamber machined in a LTCC substrate. The chamber was covered either on one or both sides with Kapton diaphragms on which copper coils were patterned. The diaphragms were actuated by passing electric current through the coils in the presence of permanent magnets. Passive Kapton flap valves were used to direct fluid flow into and out of the chamber. The first design consisted of a single, circular diaphragm pump. In the second design, two circular diaphragms were used. The two diaphragms are deflected into and out of the pressure chamber simultaneously. Flow rates of up to 7 mL/min were measured. The static response of a circular diaphragm subjected to magnetic forces was computed using the finite element method (FEM). The effect of the copper coils on diaphragm stiffness was accounted for. The design parameters (the number of windings and the size and location of the magnet) needed to maximize the volumetric displacement were determined. At relatively high currents, the coils heated up significantly and caused the pump’s performance to deteriorate.

Uticaj programirane promene faznog stava struje na specifičnu silu cilindričnih linearnih motora sa stalnim magnetima

2021 ◽  
Vol 23 (1) ◽  
pp. 7-10
Author(s):  
Žаrkо Kоprivicа ◽  
◽  
Drаgаn Мihić
Keyword(s):  
Phase Angle ◽  
Permanent Magnets ◽  
Magnetic Circuit ◽  
Electromagnetic Interaction ◽  
Specific Force ◽  
The Finite Element Method ◽  
Current Form ◽  
Pneumatic Actuators ◽  
Linear Motors ◽  
Simulation Results

Due to their prominent properties, tubular permanent magnet linear motors are increasingly being employed in areas in which hydraulic and pneumatic actuators are traditionally used. In order to achieve the highest possible specific force, a method based on a programmed change of the phase angle is proposed. The proposed method takes the influence of the magnetic circuit saturation on the electromagnetic interaction and current form. Simulation results are obtained using the finite element method. This method of determining the phase angle can be applied to all machines with permanent magnets in which the saturation of the magnetic circuit is pronounced.

scholarly journals The Learning Pathways Grid

2018 ◽  
Vol 17 (1) ◽  
pp. 160940691879160 ◽  
Author(s):  
Andrew Stuart Lane ◽  
Chris Roberts
Keyword(s):  
Qualitative Research ◽  
Data Collection ◽  
Data Gathering ◽  
High Fidelity ◽  
High Fidelity Simulation ◽  
Cognitive Frames ◽  
Open Disclosure ◽  
Learning Pathways ◽  
Social Constructivist Approach ◽  
Insight Into

The interview is an important data-gathering tool in qualitative research, since it allows researchers to gain insight into a person’s knowledge, understandings, perceptions, interpretations, and experiences. There are many definitions of reflexivity in qualitative research, one such definition being “Reflexivity is an attitude of attending systematically to the context of knowledge construction, especially to the effect of the researcher, at every step of the research processes.” The learning pathways grid (LPG) is a visual template used to assist analysis and interpretation of conversations, allowing educators, learners, and researchers, to discover links from cognition to action, usually in a retrospective manner. It is often used in simulation educational research, with a focus on understanding how learners access their cognitive frames and underlying beliefs. In this article, we describe the use of the LPG as a prospective adjunct to data collection for interviews and focus groups. We contextualize it within a study among medical interns and medical students who were engaged in high-fidelity simulation exploring open disclosure after a medication error. The LPG allowed future optimization of data collection and interpretation by ensuring reflexivity within the researchers, a vital part of research conduct. We conclude by suggesting the use of the LPG has a reasonable fit when taking a social constructivist approach and using qualitative analysis methods that make reflexivity explicit and visible, therefore ensuring it is truly considered, understood, and demonstrated by researchers.

scholarly journals Special Issue “Applications of Finite Element Modeling for Mechanical and Mechatronic Systems”

2021 ◽  
Vol 11 (11) ◽  
pp. 5170
Author(s):  
Marek Krawczuk ◽  
Magdalena Palacz
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Modeling ◽  
Engineering Practice ◽  
The Finite Element Method ◽  
Special Issue ◽  
Mechatronic Systems ◽  
Modeling And Analysis ◽  
Modern Engineering ◽  
Concise Description

Modern engineering practice requires advanced numerical modeling because, among other things, it reduces the costs associated with prototyping or predicting the occurrence of potentially dangerous situations during operation in certain defined conditions. Different methods have so far been used to implement the real structure into the numerical version. The most popular have been variations of the finite element method (FEM). The aim of this Special Issue has been to familiarize the reader with the latest applications of the FEM for the modeling and analysis of diverse mechanical problems. Authors are encouraged to provide a concise description of the specific application or a potential application of the Special Issue.

Dynamics of 3D Micropolar Gyroelastic Beams

2014 ◽  
Author(s):  
Soroosh Hassanpour ◽  
G. R. Heppler
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Dynamic Modeling ◽  
Dynamic Equations ◽  
Hamilton’S Principle ◽  
The Finite Element Method ◽  
Hamilton's Principle ◽  
Modeling And Analysis ◽  
Element Method

This paper is devoted to the dynamic modeling of micropolar gyroelastic beams and explores some of the modeling and analysis issues related to them. The simplified micropolar beam torsion and bending theories are used to derive the governing dynamic equations of micropolar gyroelastic beams from Hamilton’s principle. Then these equations are solved numerically by utilizing the finite element method and are used to study the spectral and modal behaviour of micropolar gyroelastic beams.

scholarly journals Analysis of the impact of changes in the stator magnetic circuit on static properties of the electromagnetic linear motor model

2018 ◽  
Vol 67 (3) ◽  
pp. 71-81
Author(s):  
Krzysztof Just ◽  
Paweł Piskur
Keyword(s):  
Magnetic Force ◽  
Permanent Magnets ◽  
Magnetic Circuit ◽  
Evaluation Criteria ◽  
Static Properties ◽  
Independent Variable ◽  
The Mean ◽  
Electro Magnetic ◽  
The Impact ◽  
Maximum Minimum

In this paper, the static characteristics as a function of changes in geometric dimensions of the stator magnetic circuit of the linear stepper actuator with permanent magnets is presented. The stator is built from a series of cylindrical coils encapsulated with ferromagnetic case. The runner is made of permanent magnet rings connected with ferromagnetic spacers. The electromagnetic interac-tion between the stator and the runner for the sequential supply of coils was analyzed. The electro-magnetic force as a function of the geometry of the coils and the ferromagnetic housing for the con-stant graduation of the runner was determined. The maximum, minimum, and average values of the electromagnetic force as a function of the geometric independent variable were determined. The ratio of the mean force to the maximum, and mechanical work calculated as the integral of the force on the path of the runner was adopted as the evaluation criteria. A comparison between the maximum, average and relative values of forces as a function of the geometric dimensions of the stator was made. Keywords: modelling and simulation, linear actuator, finite element method, field calculations, cogging force, magnetic force.

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