Magnetic Field Distribution

14,000,000 Leading Edge Experts on the ideXlab platform

Scan Science and Technology

Contact Leading Edge Experts & Companies

Scan Science and Technology

Contact Leading Edge Experts & Companies

The Experts below are selected from a list of 92154 Experts worldwide ranked by ideXlab platform

Theodosios Korakianitis - One of the best experts on this subject based on the ideXlab platform.

  • analytical calculation of open circuit Magnetic Field Distribution of slotless brushless pm machines
    International Journal of Electrical Power & Energy Systems, 2013
    Co-Authors: Akbar Rahideh, Theodosios Korakianitis
    Abstract:

    Abstract A comprehensive analytical open-circuit Magnetic Field Distribution of slotless brushless permanent magnet machines with surface mounted magnets is presented for six different magnetization patterns. The stator and rotor back-irons are assumed to be finite permeable. Therefore, the analytical model covers five annular regions: rotor; magnet; air–gap/winding; stator; and exterior. The expressions of the five regions are presented in a convenient form to ease the numerical computation for both internal and external rotor motors. The induced back-EMF is also expressed analytically. The efficacy of the analytical model is validated by comparing the results with finite element analyses (FEAs).

  • analytical Magnetic Field Distribution of slotless brushless pm motors part 2 open circuit Field and torque calculations
    Iet Electric Power Applications, 2012
    Co-Authors: Akbar Rahideh, Theodosios Korakianitis
    Abstract:

    This study presents the open-circuit analytical Magnetic Field Distribution of slotless brushless permanent magnet motors equipped with surface-mounted magnets. Although the focus of the study is on open-circuit Magnetic Field analysis, by augmenting the open-circuit Magnetic Field Distribution with the armature reaction Field Distribution obtained from the first part of the series of two studies, the electroMagnetic torque is calculated. The electroMagnetic torque is calculated for both internal and external rotor motors with six different magnetisation patterns and three different armature current waveforms. The analysis domain consists of eight annular concentric regions: motor shaft, rotor back-iron, magnets, retaining sleeve, air-gap, winding, stator back-iron and exterior regions. Based on the open-circuit Magnetic Field Distribution, the induced back-electromotive force (EMF) is also calculated. The validity of the proposed model is confirmed by comparing the analytical results with those obtained from the finite element method and an experimental set-up.

  • analytical open circuit Magnetic Field Distribution of slotless brushless permanent magnet machines with rotor eccentricity
    IEEE Transactions on Magnetics, 2011
    Co-Authors: Akbar Rahideh, Theodosios Korakianitis
    Abstract:

    Analytical expressions for the no-load Magnetic Field Distribution of slotless brushless permanent-magnet (PM) machines with static, dynamic, and mixed rotor eccentricities are presented. The proposed analytical expressions can be used for slotless brushless PM machines with any radius-independent magnetization pattern. The analytical expressions and the results for six different magnetization patterns are presented. Based on the analytical Magnetic Field Distribution, the line and phase back-electromotive force waveforms, local traction components and unbalanced Magnetic forces are obtained. The analytical results are compared with those from finite-element analyses to validate the derived expressions.

  • analytical Magnetic Field Distribution of slotless brushless machines with inset permanent magnets
    IEEE Transactions on Magnetics, 2011
    Co-Authors: Akbar Rahideh, Theodosios Korakianitis
    Abstract:

    An analytical open-circuit Magnetic Field Distribution for slotless brushless machines with inset permanent magnets is presented. Three different magnetization patterns (radial, parallel, and Halbach) have been considered and their results compared with each other. The induced back-electromotive force (EMF) is also presented for each magnetization pattern. The effects of iron inter-pole on the Magnetic flux density and back-EMF have been studied. To verify the model, the results have been compared with those obtained from finite element analyses (FEA).

Akbar Rahideh - One of the best experts on this subject based on the ideXlab platform.

  • analytical calculation of open circuit Magnetic Field Distribution of slotless brushless pm machines
    International Journal of Electrical Power & Energy Systems, 2013
    Co-Authors: Akbar Rahideh, Theodosios Korakianitis
    Abstract:

    Abstract A comprehensive analytical open-circuit Magnetic Field Distribution of slotless brushless permanent magnet machines with surface mounted magnets is presented for six different magnetization patterns. The stator and rotor back-irons are assumed to be finite permeable. Therefore, the analytical model covers five annular regions: rotor; magnet; air–gap/winding; stator; and exterior. The expressions of the five regions are presented in a convenient form to ease the numerical computation for both internal and external rotor motors. The induced back-EMF is also expressed analytically. The efficacy of the analytical model is validated by comparing the results with finite element analyses (FEAs).

  • analytical Magnetic Field Distribution of slotless brushless pm motors part 2 open circuit Field and torque calculations
    Iet Electric Power Applications, 2012
    Co-Authors: Akbar Rahideh, Theodosios Korakianitis
    Abstract:

    This study presents the open-circuit analytical Magnetic Field Distribution of slotless brushless permanent magnet motors equipped with surface-mounted magnets. Although the focus of the study is on open-circuit Magnetic Field analysis, by augmenting the open-circuit Magnetic Field Distribution with the armature reaction Field Distribution obtained from the first part of the series of two studies, the electroMagnetic torque is calculated. The electroMagnetic torque is calculated for both internal and external rotor motors with six different magnetisation patterns and three different armature current waveforms. The analysis domain consists of eight annular concentric regions: motor shaft, rotor back-iron, magnets, retaining sleeve, air-gap, winding, stator back-iron and exterior regions. Based on the open-circuit Magnetic Field Distribution, the induced back-electromotive force (EMF) is also calculated. The validity of the proposed model is confirmed by comparing the analytical results with those obtained from the finite element method and an experimental set-up.

  • analytical open circuit Magnetic Field Distribution of slotless brushless permanent magnet machines with rotor eccentricity
    IEEE Transactions on Magnetics, 2011
    Co-Authors: Akbar Rahideh, Theodosios Korakianitis
    Abstract:

    Analytical expressions for the no-load Magnetic Field Distribution of slotless brushless permanent-magnet (PM) machines with static, dynamic, and mixed rotor eccentricities are presented. The proposed analytical expressions can be used for slotless brushless PM machines with any radius-independent magnetization pattern. The analytical expressions and the results for six different magnetization patterns are presented. Based on the analytical Magnetic Field Distribution, the line and phase back-electromotive force waveforms, local traction components and unbalanced Magnetic forces are obtained. The analytical results are compared with those from finite-element analyses to validate the derived expressions.

  • analytical Magnetic Field Distribution of slotless brushless machines with inset permanent magnets
    IEEE Transactions on Magnetics, 2011
    Co-Authors: Akbar Rahideh, Theodosios Korakianitis
    Abstract:

    An analytical open-circuit Magnetic Field Distribution for slotless brushless machines with inset permanent magnets is presented. Three different magnetization patterns (radial, parallel, and Halbach) have been considered and their results compared with each other. The induced back-electromotive force (EMF) is also presented for each magnetization pattern. The effects of iron inter-pole on the Magnetic flux density and back-EMF have been studied. To verify the model, the results have been compared with those obtained from finite element analyses (FEA).

Shuo Zhang - One of the best experts on this subject based on the ideXlab platform.

  • analytical calculation of Magnetic Field Distribution and stator iron losses for surface mounted permanent magnet synchronous machines
    Energies, 2017
    Co-Authors: Zhen Tian, Chengning Zhang, Shuo Zhang
    Abstract:

    Permanent-magnet synchronous machines (PMSMs) are widely used in electric vehicles owing to many advantages, such as high power density, high efficiency, etc. Iron losses can account for a significant component of the total loss in permanent-magnet (PM) machines. Consequently, these losses should be carefully considered during the PMSM design. In this paper, an analytical calculation method has been proposed to predict the Magnetic Field Distribution and stator iron losses in the surface-mounted permanent magnet (SPM) synchronous machines. The method introduces the notion of complex relative air-gap permeance to take into account the effect of slotting. The imaginary part of the relative air-gap permeance is neglected to simplify the calculation of the Magnetic Field Distribution in the slotted air gap for the surface-mounted permanent-magnet (SPM) machine. Based on the armature reaction Magnetic Field analysis, the stator iron losses can be estimated by the modified Steinmetz equation. The stator iron losses under load conditions are calculated according to the varying d-q-axis currents of different control methods. In order to verify the analysis method, finite element simulation results are compared with analytical calculations. The comparisons show good performance of the proposed analytical method.

Yu Wentao - One of the best experts on this subject based on the ideXlab platform.

  • Influence of Rotor Vibration on Magnetic Field Distribution of Radial Active Magnetic Bearings
    2019 14th IEEE Conference on Industrial Electronics and Applications (ICIEA), 2019
    Co-Authors: Ye Pinzhou, Li Hongwei, Tian Jing, Yu Wentao
    Abstract:

    Coil currents of active Magnetic bearing (AMB) change with the radial displacement of the rotor caused by rotor vibration, which affects the Magnetic Field Distribution of the AMB. In order to analyze the influence of rotor radial vibration on the power loss of AMB, it is necessary to establish a relationship model between the Magnetic Field Distribution characteristics and the rotor vibration. Considering the nonlinearity of the ferroMagnetic material and the edge effect of the Magnetic poles, the PID control method is used to control the currents of the stator coils in real time according to the vibration displacement of the rotor, and the nonlinear equivalent Magnetic circuit model of the AMB considering the rotor and stator reluctance is established. The Magnetic Field Distribution characteristics of AMB during rotor vibration are analyzed, and the Magnetic density in air gap is obtained, and compared with the results given by the electroMagnetic Field finite element software. The error between the Magnetic path method and the FEM analysis result is within 3%, Which has high accuracy. The model established in this paper provides a theoretical basis for the Magnetic Field analysis of the AMB during rotor vibration and the subsequent loss analysis.

Edval J. P. Santos - One of the best experts on this subject based on the ideXlab platform.

  • Measuring the Magnetic Field Distribution of a magnetron sputtering target
    Journal of Vacuum Science and Technology, 1999
    Co-Authors: Edval J. P. Santos
    Abstract:

    The lifetime of a sputtering target is related to the Magnetic Field Distribution near the target surface, which is related to the magnets’ arrangement underneath the target. Therefore, a key design issue is the placement of the magnets to ensure an optimum target lifetime. Even in maintenance procedures it may be necessary to know the Magnetic Field Distribution near the target. This work presents a technique which can be used to map the Magnetic Field over large targets. The system uses a custom made acquisition board, a modified plotter, and a Hall sensor to measure the two-dimensional Magnetic Field configuration at different heights near the target. It has been tested with success to measure a 62 mm×226 mm target area in the three coordinates.