ESTUDO DE MATERIAIS MAGNÉTICOS MACIOS SINTERIZADOS PARA APLICAÇÃO EM SERVOMOTORES

Resumo Este trabalho teve por objetivo o estudo de ligas sinterizadas a partir de Fe puro, FeP, FeSi e FeNi obtidas a partir do processo da Metalurgia do Pó e sua aplicação em núcleos de rotor e estator de servomotores, operando com corrente elétrica de armadura de alta freqüência, reduzindo assim, nestas frequências, as correntes parasitas, as quais causam perda de potência nestas máquinas. O estudo compreendeu obtenção de curvas de histerese destas diversas ligas, ensaios para avaliação de perdas elétricas e simulação em software de elementos finitos para obtenção de fluxo de entreferro e conjugado eletromagnético (torque). Os estudos teóricos e simulações foram realizados em um servomotor de topologia convencional e os testes foram realizados comparativamente a servomotores com núcleos obtidos a partir de chapas de aço laminadas. Nas simulações realizadas estaticamente, o torque instantâneo e o fluxo magnético no núcleo de Fe1%P resultaram valores próximos em relação às tradicionais chapas de aço laminadas. O núcleo de Fe1%P apresentou torque instantâneo de 1,59 N.m e fluxo magnético de 1,70 T e o núcleo de chapas de aço laminadas, respectivamente, 1,65 N.m e 1,66 T.Palavras-chave: Metalurgia do Pó. Servomotores. Simulação por elementos finitos. ABSTRACT This work aimed to study sintered alloys from pure Fe, FeP, FeSi and FeNi obtained by Powder Metallurgy process, and its application in rotor and stator cores of servomotors, operating with armature electric current in high frequency, thus reducing, in these frequencies, eddy currents, which cause loss of power in these machines. The study comprised obtaining hysteresis curves from these different alloys, tests to evaluate electrical losses and simulation in finite element software to obtain airflow and electromagnetic conjugate (torque). Theoretical studies and simulations were performed on a conventional topology of servomotor, and the tests were carried out comparatively to servomotors with cores obtained from rolled steel sheets. In the simulations performed statically, the instantaneous torque and the magnetic flux in the Fe1%P core resulted close values in relation to the traditional laminated steel sheets. The Fe1%P core had an instantaneous torque of 1.59 N.m and a magnetic flux of 1.70 T and the core of rolled steel sheets, respectively, 1.65 N.m and 1.66 T.Keywords: Powder Metallurgy. Servomotors. Finite Element Simulation.

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Research on Thermally Induced Deformation of Reinforcing Plate Based on Finite Element Simulation

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.197.139 ◽

2012 ◽

Vol 197 ◽

pp. 139-143

Author(s):

Hua Bai ◽

Yi Du Zhang

Keyword(s):

Finite Element ◽

Ambient Temperature ◽

Finite Element Simulation ◽

Temperature Change ◽

Large Scale ◽

Machining Process ◽

Reinforcement Structure ◽

Thermally Induced ◽

Finite Element Software ◽

Element Simulation

The change of ambient temperature will cause deformation during the machining process of large-scale aerospace monolithic component. Based on finite element simulation, thermally induced deformation of reinforcing plate is studied in such aspects as reinforcement structure, clamping method and temperature change, and contact function in finite element software is used to simulate the unilateral constraint between workpiece and worktable. The results indicate that reinforcing plate will produce warping deformation due to the change of ambient temperature. Different reinforcement structures and clamping methods have important influence on the deformation positions and degrees, and the deformation is proportional to the temperature change.

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A pragmatic approach for the evaluation of depth-sensing indentation in the self-similar regime

Journal of Applied Mechanics ◽

10.1115/1.4052218 ◽

2021 ◽

pp. 1-24

Author(s):

Hamidreza Mahdavi ◽

Konstantinos Poulios ◽

Christian F. Niordson

Keyword(s):

Finite Element ◽

Element Model ◽

Depth Sensing ◽

Finite Element Software ◽

Element Simulation ◽

Unique Material ◽

Reverse Analysis ◽

Supplementary Material ◽

Two Parameters ◽

Force Displacement

Abstract This work evaluates and revisits elements from the depth-sensing indentation literature by means of carefully chosen practical indentation cases, simulated numerically and compared to experiments. The aim is to close a series of debated subjects, which constitute major sources of inaccuracies in the evaluation of depth-sensing indentation data in practice. Firstly, own examples and references from the literature are presented in order to demonstrate how crucial self-similarity detection and blunting distance compensation are, for establishing a rigorous link between experiments and simple sharp-indenter models. Moreover, it is demonstrated, once again, in terms of clear and practical examples, that no more than two parameters are necessary to achieve an excellent match between a sharp indenter finite element simulation and experimental force-displacement data. The clear conclusion is that reverse analysis methods promising to deliver a set of three unique material parameters from depth-sensing indentation cannot be reliable. Lastly, in light of the broad availability of modern finite element software, we also suggest to avoid the rigid indenter approximation, as it is shown to lead to unnecessary inaccuracies. All conclusions from the critical literature review performed lead to a new semi-analytical reverse analysis method, based on available dimensionless functions from the literature and a calibration against case specific finite element simulations. Implementations of the finite element model employed are released as supplementary material, for two major finite element software packages.

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Numerical simulation of blanking process

MATEC Web of Conferences ◽

10.1051/matecconf/201815702038 ◽

2018 ◽

Vol 157 ◽

pp. 02038

Author(s):

Peter Pecháč ◽

Milan Sága

Keyword(s):

Numerical Simulation ◽

Finite Element ◽

Steel Sheet ◽

Plastic Material ◽

Material Model ◽

Rolled Steel ◽

Finite Element Software ◽

History Of ◽

Cold Rolled ◽

Blanking Process

This paper presents numerical simulation of blanking process for cold-rolled steel sheet metal. The problem was modeled using axial symmetry in commercial finite element software ADINA. Data obtained by experimental measurement were used to create multi-linear plastic material model for simulation. History of blanking force vs. tool displacement was obtained.

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Analysis of Resistance Spot Welding Process Parameters Effect on the Weld Quality of Three-steel Sheets Used in Automotive Industry: Experimental and Finite Element Simulation

International Journal of Engineering ◽

10.5829/ije.2020.33.01a.17 ◽

2020 ◽

Vol 33 (1) ◽

Cited By ~ 1

Keyword(s):

Finite Element ◽

Finite Element Simulation ◽

Process Parameters ◽

Automotive Industry ◽

Resistance Spot Welding ◽

Spot Welding ◽

Welding Process ◽

Steel Sheets ◽

Element Simulation

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The Simulation of Stem Cutting and Parameter Optimization for Power Station Valve

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.820.151 ◽

2013 ◽

Vol 820 ◽

pp. 151-156

Author(s):

S.H. Zou ◽

H.L. Wang ◽

C.X. Yang ◽

Y.P. Shi ◽

J.H. Ge

Keyword(s):

Finite Element ◽

Finite Element Simulation ◽

Cutting Temperature ◽

Adaptive Meshing ◽

Finite Element Software ◽

Valve Stem ◽

Element Simulation ◽

Adaptive Meshing Technique ◽

Proper Material ◽

Material Constitutive Equation

We expound the finite element simulation and the key points of metal turning by the material properties of the stem in this paper, and select the proper material constitutive equation, then use the adaptive meshing technique, and then finite element modeling was carried out on the valve stem in the professional finite element software Advantedge FEM. The optimization scheme we designed of finite element simulation for the valve stem through the finite element software Advantedge FEM, and we research the influence of the amount of feed and speed cutting process about the cutting force and the cutting temperature.

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Nonlinear finite element simulation for magnetic flux leakage tester

Pollack Periodica ◽

10.1556/pollack.3.2008.1.7 ◽

2008 ◽

Vol 3 (1) ◽

pp. 81-90 ◽

Cited By ~ 4

Author(s):

Gergely Kovács ◽

Miklós Kuczmann

Keyword(s):

Finite Element ◽

Magnetic Flux ◽

Finite Element Simulation ◽

Nonlinear Finite Element ◽

Magnetic Flux Leakage ◽

Element Simulation ◽

Nonlinear Finite Element Simulation ◽

Flux Leakage

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Three Dimensional Finite Element Analysis of Reinforced Concrete Rectangular-Sectioned Aqueduct

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.644.358 ◽

2013 ◽

Vol 644 ◽

pp. 358-361

Author(s):

Dong Yu Ji

Keyword(s):

Finite Element ◽

Reinforced Concrete ◽

Simulation Analysis ◽

Three Dimensional ◽

Element Analysis ◽

Finite Element Software ◽

Operating Process ◽

Element Simulation ◽

Dimensional Finite Element ◽

Three Dimensional Finite Element

This paper adopts general finite element software to carry out three-dimensional finite element simulation analysis for Huizeli reinforced concrete rectangular-sectioned aqueduct. Considering four combination cases in aqueduct’s construction and operating process, researching variation laws of the aqueduct’s stress and displacement. Analysis results show that design scheme of Huizeli reinforced concrete rectangular-sectioned aqueduct is reasonable, it can meet design requirements. Analysis results provide some theory references for design of reinforced concrete rectangular-sectioned aqueduct.

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A numerical simulation for prediction of thermal ablation in composite rocket motor casing

International Journal of Computational Materials Science and Engineering ◽

10.1142/s2047684120500207 ◽

2020 ◽

pp. 2050020

Author(s):

Vijaya Kanth Pamarthi ◽

V. Balakrishna Murthy

Keyword(s):

Finite Element ◽

Thermal Protection ◽

Rocket Motor ◽

Heat Of Fusion ◽

Space Applications ◽

Combustion Gases ◽

Finite Element Software ◽

Element Simulation ◽

Similar Motor ◽

Insulation Liner

Thermal protection systems (TPS) are used in space applications to protect structures failing from burning and/or excessive temperatures. In this work, a finite element simulation is performed to analyze the behavior of a composite rocket motor casing during the expansion of combustion gases inside the motor. A two-dimensional axisymmetric model of a rocket motor casing provided with an insulating liner is modeled in a finite element software ANSYS. Variable equivalent heat flux at the inside faces of the liner, due to radiation and convection of gases, is estimated and applied as a boundary condition. The reduction of heat load with time due to latent heat of fusion and the resistance offered by char that exists above the pyrolysis front is also considered. At the same time, the material properties of the portion of the liner exposed to its melting point temperature are regulated to offer negligible resistance to move the boundary load on to the pyrolysis front at every instant. A transient analysis is carried out with appropriate mesh quality and time steps for 10 s. Ablation, charring, and unaffected regions are identified and the required insulation liner thickness is recommended. Extension of the procedure to model a similar motor with any other cylindrical length is discussed.

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Fast Torque Computation of Hysteresis Motors and Clutches Using Magneto-static Finite Element Simulation

Energies ◽

10.3390/en12173311 ◽

2019 ◽

Vol 12 (17) ◽

pp. 3311 ◽

Cited By ~ 2

Author(s):

Gianvito Gallicchio ◽

Marco Palmieri ◽

Mauro Di Nardo ◽

Francesco Cupertino

Keyword(s):

Finite Element ◽

Torque Ripple ◽

Electrical Machine ◽

Fe Modelling ◽

Finite Element Software ◽

Constant Torque ◽

Element Simulation ◽

Normal Magnetization ◽

Low Efficiency ◽

Low Torque

Hysteresis motor and clutches have several advantages, such as constant torque from zero to synchronous speed, low torque ripple, and low fabrication cost. Low efficiency and power factor are the main features that have limited the application of this type of electrical machine to few applications. Being a niche argument, little literature has addressed the problem of analytical and finite element (FE) modelling of hysteresis electrical machines. This paper first describes the most important contributions of the literature on the analytical and FE modelling of hysteresis motors and clutches and then proposes a method for the fast computation of its performance. The proposed procedure consists of two steps: first, a magneto-static FE simulation is performed considering the normal magnetization curve of the hysteresis material; then, the average torque is computed by a post-processing analysis. The proposed method is used to analyze a hysteresis clutch and the obtained results are compared with those achieved using a commercial finite element software that implements a vector hysteresis model.

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