The Experts below are selected from a list of 1911 Experts worldwide ranked by ideXlab platform
Donát Martin - One of the best experts on this subject based on the ideXlab platform.
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Complex Analysis of Modal Properties of Rotating Electrical Machines
Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015Co-Authors: Donát MartinAbstract:This dissertation thesis deals with the computational modelling of the dynamic response of the Rotating Electrical Machine structure on the application of the magnetic forces. Apart from the dynamic response of the ideal symmetrical Machine, the influence of the air gap eccentricity on the dynamics response is studied in this work. A basic type of the air gap eccentricity, which is caused by eccentric mounting of the rotor pack on the shaft of the rotor, is considered. The calculations the dependence of the magnetic forces on the time and a misalignment of the rotor pack are performed as first. The computational model of the magnetic field of the Rotating Electrical Machine, which is based on solution of the electromagnetic coupled field analysis by finite element method, is used for this purpose. An analysis of the influence of the unbalanced magnetic pull and the stiffness of some parts of the Machine on the modal properties of the Machine is performed in the second part of this thesis. A third part of this thesis is focused on the calculation of the dynamic response of the Machine during the steady state operation of the Machine and the influence of the rotor pack misalignment on the dynamic response is studied. The obtained results showed that the tangential components of the magnetic forces, which act on the stator pack, excite significant torsional vibration of the stator. Besides the vibration of the stator of the Machine, the influence of the rotor pack misalignment on the sound power of the Machine, vibration of the rotor, loads of rotor bearings and air gap eccentricity is studied in this thesis
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Complex Analysis of Modal Properties of Rotating Electrical Machines
Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015Co-Authors: Donát MartinAbstract:Tato disertační práce se zabývá problematikou výpočtového modelování dynamické odezvy struktury točivého elektrického stroje na působení magnetických sil. Kromě dynamické odezvy ideálně symetrického stroje je v práci také zkoumán vliv nesymetrie vzduchové mezery na dynamickou odezvu stroje. Uvažován je základní typ nesymetrie vzduchové mezery způsobený excentrickým uložením rotorového svazku na hřídeli rotoru. V první části práce je proveden výpočet závislosti magnetických sil, na čase a velikosti nesymetrie vzduchové mezery. K tomuto účelu je použit výpočtový model magnetického pole točivého elektrického stroje založený na řešení sdružené elektromagnetické úlohy metodou konečných prvků. Druhá část práce se zabývá analýzou vlivu magnetického tahu a tuhosti vybraných částí stroje na modální vlastnosti řešeného stroje. V třetí části práce je proveden výpočet dynamické odezvy stroje při ustáleném chodu a posouzen vliv vyosení rotorového svazku na dynamickou odezvu stroje. Provedené výpočty ukázaly, že tečné složky magnetických sil, které působí na statorový svazek, vybudí významné torzní vibrace statoru stroje. Kromě vibrací statoru stroje je v práci zkoumán vliv vyosení rotorového svazku na akustický výkon stroje, vibrace rotoru, zatížení ložisek a nesymetrii vzduchové mezery.This dissertation thesis deals with the computational modelling of the dynamic response of the Rotating Electrical Machine structure on the application of the magnetic forces. Apart from the dynamic response of the ideal symmetrical Machine, the influence of the air gap eccentricity on the dynamics response is studied in this work. A basic type of the air gap eccentricity, which is caused by eccentric mounting of the rotor pack on the shaft of the rotor, is considered. The calculations the dependence of the magnetic forces on the time and a misalignment of the rotor pack are performed as first. The computational model of the magnetic field of the Rotating Electrical Machine, which is based on solution of the electromagnetic coupled field analysis by finite element method, is used for this purpose. An analysis of the influence of the unbalanced magnetic pull and the stiffness of some parts of the Machine on the modal properties of the Machine is performed in the second part of this thesis. A third part of this thesis is focused on the calculation of the dynamic response of the Machine during the steady state operation of the Machine and the influence of the rotor pack misalignment on the dynamic response is studied. The obtained results showed that the tangential components of the magnetic forces, which act on the stator pack, excite significant torsional vibration of the stator. Besides the vibration of the stator of the Machine, the influence of the rotor pack misalignment on the sound power of the Machine, vibration of the rotor, loads of rotor bearings and air gap eccentricity is studied in this thesis.
Augusto Fusari - One of the best experts on this subject based on the ideXlab platform.
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Design, Prototyping and Testing of a Rotating Electrical Machine With Linear Geometry for Shipboard Applications
IEEE Access, 2020Co-Authors: Mario Mezzarobba, Alberto Tessarolo, Nicola Barbini, Simone Castellan, Barbara Codan, Martina Terconi, Claudio Bruzzese, Augusto FusariAbstract:Conventional Rotating Electrical Machines are characterized by stator and rotor structures featuring a cylindrical geometry around the shaft rotational axis. Although advantageous for mechanical reasons, the cylindrical geometry results in overall Machine shapes and dimensions that may be unsuitable for installation. This particularly occurs in shipboard applications, where electric motors and generators are subject to stringent room constraints and need to be fit in unusually shaped compartments. This paper presents the development and test of a dual-shaft Rotating permanent-magnet electric Machine prototype having a linear structure that facilitates its onboard use for such applications as electric propulsion and rudder actuation. In fact, the proposed Machine topology has overall dimensions which can be adjusted to fit the space available for installation. The operating concept and the detailed electromechanical design of the Machine are first described. Then the manufacturing and factory test of the prototype under inverter supply are illustrated. Finally, the validation of the prototype as a boat propulsion variable-speed inverter-fed motor is presented. It is proved that, despite of its highly non-conventional electromechanical design, the Machine can be effectively fed from a general-purpose inverter for permanent magnet motors.
Haiyan Lu - One of the best experts on this subject based on the ideXlab platform.
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measurement and modeling of rotational core losses of soft magnetic materials used in Electrical Machines a review
IEEE Transactions on Magnetics, 2008Co-Authors: Jinjiang Zhong, Haiyan LuAbstract:In many situations, for example, in the cores of a Rotating Electrical Machine and the T-joints of multiphase transformers, the magnetic flux varies with time in terms of both magnitude and direction, i.e., the local flux density vector rotates with varying magnitude and varying speed. Therefore, it is important that the magnetic properties of the core materials under various rotational magnetizations be properly investigated, modeled, and applied in the design and analysis of electromagnetic devices with rotational flux. Drawing from the huge amount of papers published by various researchers in the past century, this paper presents an extensive survey on the measurement and modeling of rotational core losses of soft magnetic materials used in Electrical Machines, particularly from the view of practical engineering application. The paper aims to provide a broad picture of the historical development of measuring techniques, measuring apparatus, and practical models of rotational core losses.
Mario Mezzarobba - One of the best experts on this subject based on the ideXlab platform.
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Design, Prototyping and Testing of a Rotating Electrical Machine With Linear Geometry for Shipboard Applications
IEEE Access, 2020Co-Authors: Mario Mezzarobba, Alberto Tessarolo, Nicola Barbini, Simone Castellan, Barbara Codan, Martina Terconi, Claudio Bruzzese, Augusto FusariAbstract:Conventional Rotating Electrical Machines are characterized by stator and rotor structures featuring a cylindrical geometry around the shaft rotational axis. Although advantageous for mechanical reasons, the cylindrical geometry results in overall Machine shapes and dimensions that may be unsuitable for installation. This particularly occurs in shipboard applications, where electric motors and generators are subject to stringent room constraints and need to be fit in unusually shaped compartments. This paper presents the development and test of a dual-shaft Rotating permanent-magnet electric Machine prototype having a linear structure that facilitates its onboard use for such applications as electric propulsion and rudder actuation. In fact, the proposed Machine topology has overall dimensions which can be adjusted to fit the space available for installation. The operating concept and the detailed electromechanical design of the Machine are first described. Then the manufacturing and factory test of the prototype under inverter supply are illustrated. Finally, the validation of the prototype as a boat propulsion variable-speed inverter-fed motor is presented. It is proved that, despite of its highly non-conventional electromechanical design, the Machine can be effectively fed from a general-purpose inverter for permanent magnet motors.
Matsuo Tomohiro - One of the best experts on this subject based on the ideXlab platform.
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electromagnetic brake Rotating Electrical Machine and elevator
2012Co-Authors: Tsumagari Hiroshi, Otake Kenichi, Nishi Shinichi, Matsuo TomohiroAbstract:An electromagnetic brake (200) includes a brake plate (202), two pressing members (203a, 203b) that press the brake plate (202) when braking is performed on the brake plate (202), a compression coil spring (208a, 208b) that urges the two pressing members (203a, 203b) in such a manner that the brake plate (202) is pressed, and an electromagnetic coil (207) that moves the two pressing members (203a, 203b) in a direction that is opposite to a direction of an urging force of the compressing coil spring (208a, 208b) when braking is not being performed on the brake plate (202). The compressing coil spring (208a, 208b) urges the two pressing members (203a, 203b) in such a manner that the magnitudes of pressing forces of the two pressing members (203a, 203b) are made to be different from each other.
