The Experts below are selected from a list of 780 Experts worldwide ranked by ideXlab platform

Yacine Amara - One of the best experts on this subject based on the ideXlab platform.

  • Armature Reaction Magnetic Field of Tubular Linear Surface-Inset Permanent-Magnet Machines
    IEEE Transactions on Magnetics, 2011
    Co-Authors: Yacine Amara, Georges Barakat, P. Reghem
    Abstract:

    This paper presents an exact 2-D analytical model for predicting the Armature Reaction magnetic field in idealized structures of permanent-magnet tubular linear machines with surface-inset mounted magnets. The Armature Reaction magnetic field distributions is analytically derived and compared to finite-element analyses. The analytical solution allows the prediction of the machine inductance and reluctance force in closed forms, and facilitates the evaluation of any possible partial irreversible demagnetization of the magnets. It can also be used to estimate resistance limited eddy-current losses in Armature windings and permanent magnets. The developed analytical model can be advantageously used for the analysis and design of a class of linear tubular machines.

  • Armature Reaction field of tubular linear surface-inset permanent magnet machines
    The XIX International Conference on Electrical Machines - ICEM 2010, 2010
    Co-Authors: Yacine Amara, Georges Barakat, P. Reghem
    Abstract:

    This paper presents an exact 2D analytical model for predicting the Armature Reaction magnetic field in idealized structures of permanent magnet tubular linear machines with surface-inset mounted magnets. The Armature Reaction magnetic field distributions is analytically derived and compared to finite elements analyses. The analytical solution allows the prediction of the machine inductance and reluctance force in closed forms, and facilitates the evaluation of any possible partial irreversible demagnetization of the magnets. It can also be used to estimate resistance limited eddy current losses in Armature windings and permanent magnets. The developed analytical model can be advantageously used for the analysis and design of a class of linear tubular machines.

  • two dimensional exact analytical solution of Armature Reaction field in slotted surface mounted pm radial flux synchronous machines
    IEEE Transactions on Magnetics, 2009
    Co-Authors: A Bellara, Yacine Amara, Georges Barakat, B Dakyo
    Abstract:

    This paper presents an analytical solution for prediction of the Armature Reaction magnetic field in slotted surface mounted permanent magnet radial flux synchronous machines. This technique is used in the case of internal and external rotor radial-field machines. The magnetic field expressions are developed in both slots regions and magnetic airgap region leading to an exact calculation of the effects of slotting on the airgap magnetic quantities. Results from this analytical model are compared to corresponding finite element analyses. This analytical model is then used to estimate the self and mutual inductances.

  • Armature Reaction field and inductances of tubular modular permanent magnet machines
    Journal of Applied Physics, 2005
    Co-Authors: Jiabin Wang, D Howe, Yacine Amara
    Abstract:

    The paper describes an analytical technique which has been developed to predict the Armature Reaction field of tubular modular permanent magnet (PM) machines in which the fundamental of the stator magnetomotive force (mmf) has fewer poles than that of the permanent magnet Armature, the thrust force being developed by the interaction between a higher-order mmf harmonic with the permanent magnet field. The analytical solution also allows the prediction of the self- and mutual-winding inductances of a tubular modular machine in closed forms and facilitates dynamic modeling, as well as the evaluation of any partial irreversible demagnetization of the magnets which might occur under various operating conditions. The utility and accuracy of the developed technique are demonstrated by extensive finite element analyses and measurements on a nine-slot/ten-pole tubular modular PM machine.

D Howe - One of the best experts on this subject based on the ideXlab platform.

  • A dual-lumped parameter magnetic circuit model accounting for the cross-coupling effect, with particular reference to flux-switching permanent magnet machines
    2008 4th IET Conference on Power Electronics Machines and Drives, 2008
    Co-Authors: J. T. Chen, Z Q Zhu, D Howe
    Abstract:

    In high torque density permanent magnet machines, the magnetic saturation is usually high and the Armature Reaction is very significant. A dual-lumped parameter magnetic circuit model is developed. It employs two nonlinear magnetic circuits associated with different magnetic circuits associated with the potential sources of permanent magnets and Armature Reaction, respectively. Hence, it can account for the magnetic saturation and cross-coupling effect. The developed model is compared with conventional and simplified models. It shows that the electromagnetic performance of PM machines is sensitive to the slot leakage permeance, particularly when the electric loading is high.

  • tubular modular permanent magnet machines equipped with quasi halbach magnetized magnets part ii Armature Reaction and design optimization
    IEEE Transactions on Magnetics, 2005
    Co-Authors: Jiabin Wang, D Howe
    Abstract:

    Using the analytical formulas derived in Part I for predicting the magnetic field distribution, thrust force, and electromotive force of a three-phase tubular modular permanent-magnet machine equipped with quasi-Halbach magnetized magnets, this paper analyzes the Armature Reaction field, and addresses issues that are pertinent to the design optimization of the machine. It shows that optimal values of the ratio of the axial length of the radially magnetized magnets to the pole pitch exist for both maximum force capability and minimum force ripple. The utility and accuracy of the analytical predictions and design optimization technique are demonstrated on a 9-slot/10-pole machine.

  • Armature Reaction field and inductances of tubular modular permanent magnet machines
    Journal of Applied Physics, 2005
    Co-Authors: Jiabin Wang, D Howe, Yacine Amara
    Abstract:

    The paper describes an analytical technique which has been developed to predict the Armature Reaction field of tubular modular permanent magnet (PM) machines in which the fundamental of the stator magnetomotive force (mmf) has fewer poles than that of the permanent magnet Armature, the thrust force being developed by the interaction between a higher-order mmf harmonic with the permanent magnet field. The analytical solution also allows the prediction of the self- and mutual-winding inductances of a tubular modular machine in closed forms and facilitates dynamic modeling, as well as the evaluation of any partial irreversible demagnetization of the magnets which might occur under various operating conditions. The utility and accuracy of the developed technique are demonstrated by extensive finite element analyses and measurements on a nine-slot/ten-pole tubular modular PM machine.

  • instantaneous magnetic field distribution in brushless permanent magnet dc motors ii Armature Reaction field
    IEEE Transactions on Magnetics, 1993
    Co-Authors: Z Q Zhu, D Howe
    Abstract:

    For pt.I see ibid., vol.29, no.1, p.124-135 (1993). An analytical technique for predicting the open-circuit magnetic field distribution in the airgap/magnet region of a brushless permanent-magnet DC motor equipped with a surface mounted magnet rotor and a slotless stator was presented in Pt.I. In the present work, the analysis is extended to the prediction of the Armature Reaction field produced by the three-phase stator windings. As before, th motor model is formulated in polar coordinates and accounts for the large effective airgap, but it is not developed further to consider the effect of winding current harmonics on the airgap field distribution. Predicted instantaneous Armature Reaction field distributions are validated by a comparison with corresponding finite element calculations. >

Shuming Xie - One of the best experts on this subject based on the ideXlab platform.

  • field computation for an axial flux permanent magnet synchronous generator
    IEEE Transactions on Energy Conversion, 2009
    Co-Authors: T F Cha, Loi Lei Lai, Shuming Xie
    Abstract:

    An analytical method to determine the no-load and Armature Reaction magnetic fields of a single-sided, axial flux permanent-magnet synchronous generator without Armature core is presented. Laplace's equation is solved in the rectangular coordinate system to give the scalar magnetic potentials, using a Fourier series method. For computation of the Armature Reaction field, a multi-current-sheet model is employed in order to account for the distributed nature of Armature conductors in the axial direction. Finite element analysis and experimental results on a prototype machine are presented for verifying the accuracy of the proposed method.

  • Computation of No-load and Armature Reaction Fields of an Axial-Flux Permanent-Magnet Synchronous Generator
    2007 IEEE International Electric Machines & Drives Conference, 2007
    Co-Authors: Tze-fun Chan, Shuming Xie, Loi Lei Lai
    Abstract:

    The no-load and Armature Reaction magnetic field distributions of a single-sided axial-flux permanent-magnet synchronous generator (AFPMSG) without Armature core are determined by analytical solution of the field equations, using a Fourier series approach. The method is computationally efficient and enables the harmonics and field form of the AFPMSG to be evaluated quickly. A finite element analysis of the no-load magnetic field confirms the validity of the proposed analytical method.

Jiabin Wang - One of the best experts on this subject based on the ideXlab platform.

  • tubular modular permanent magnet machines equipped with quasi halbach magnetized magnets part ii Armature Reaction and design optimization
    IEEE Transactions on Magnetics, 2005
    Co-Authors: Jiabin Wang, D Howe
    Abstract:

    Using the analytical formulas derived in Part I for predicting the magnetic field distribution, thrust force, and electromotive force of a three-phase tubular modular permanent-magnet machine equipped with quasi-Halbach magnetized magnets, this paper analyzes the Armature Reaction field, and addresses issues that are pertinent to the design optimization of the machine. It shows that optimal values of the ratio of the axial length of the radially magnetized magnets to the pole pitch exist for both maximum force capability and minimum force ripple. The utility and accuracy of the analytical predictions and design optimization technique are demonstrated on a 9-slot/10-pole machine.

  • Armature Reaction field and inductances of tubular modular permanent magnet machines
    Journal of Applied Physics, 2005
    Co-Authors: Jiabin Wang, D Howe, Yacine Amara
    Abstract:

    The paper describes an analytical technique which has been developed to predict the Armature Reaction field of tubular modular permanent magnet (PM) machines in which the fundamental of the stator magnetomotive force (mmf) has fewer poles than that of the permanent magnet Armature, the thrust force being developed by the interaction between a higher-order mmf harmonic with the permanent magnet field. The analytical solution also allows the prediction of the self- and mutual-winding inductances of a tubular modular machine in closed forms and facilitates dynamic modeling, as well as the evaluation of any partial irreversible demagnetization of the magnets which might occur under various operating conditions. The utility and accuracy of the developed technique are demonstrated by extensive finite element analyses and measurements on a nine-slot/ten-pole tubular modular PM machine.

Loi Lei Lai - One of the best experts on this subject based on the ideXlab platform.

  • field computation for an axial flux permanent magnet synchronous generator
    IEEE Transactions on Energy Conversion, 2009
    Co-Authors: T F Cha, Loi Lei Lai, Shuming Xie
    Abstract:

    An analytical method to determine the no-load and Armature Reaction magnetic fields of a single-sided, axial flux permanent-magnet synchronous generator without Armature core is presented. Laplace's equation is solved in the rectangular coordinate system to give the scalar magnetic potentials, using a Fourier series method. For computation of the Armature Reaction field, a multi-current-sheet model is employed in order to account for the distributed nature of Armature conductors in the axial direction. Finite element analysis and experimental results on a prototype machine are presented for verifying the accuracy of the proposed method.

  • Computation of No-load and Armature Reaction Fields of an Axial-Flux Permanent-Magnet Synchronous Generator
    2007 IEEE International Electric Machines & Drives Conference, 2007
    Co-Authors: Tze-fun Chan, Shuming Xie, Loi Lei Lai
    Abstract:

    The no-load and Armature Reaction magnetic field distributions of a single-sided axial-flux permanent-magnet synchronous generator (AFPMSG) without Armature core are determined by analytical solution of the field equations, using a Fourier series approach. The method is computationally efficient and enables the harmonics and field form of the AFPMSG to be evaluated quickly. A finite element analysis of the no-load magnetic field confirms the validity of the proposed analytical method.