Analytical torque model for a permanent magnet spherical motor using magnetic field reconstruction from measured boundary conditions

2013 ◽  
Author(s):  
Liang Hu ◽  
Kok-Meng Lee ◽  
Xin Fu
Keyword(s):  
Magnetic Field ◽  
Boundary Conditions ◽  
Permanent Magnet ◽  
Spherical Motor ◽  
Field Reconstruction

scholarly journals Magnetic Field Reconstruction in a Solar Active Region

2001 ◽  
Vol 203 ◽  
pp. 328-330
Author(s):  
H. Wang ◽  
Y. Yan ◽  
T. Sakurai
Keyword(s):  
Magnetic Field ◽  
Integral Equation ◽  
Active Region ◽  
Magnetic Fields ◽  
Boundary Conditions ◽  
Numerical Technique ◽  
Boundary Integral ◽  
Field Reconstruction ◽  
Coronal Magnetic Fields ◽  
Function Vector

Supposing coronal magnetic fields are in a force-free state from the chromosphere to the height of two solar radii, we reconstruct 3D force-free magnetic fields by making use of a new numerical technique, in which the fields are represented by a boundary integral equation based on a specific Green's function. Vector magnetic fields observed on the photospheric surface can be taken as the boundary conditions of this equation. Magnetic fields in AR8270 on 14 July 1998 were employed as an example to exhibit the capability of this numerical technique.

Synthesis Strategy for Stator Magnetic Field of Permanent Magnet Spherical Motor

2018 ◽  
Vol 54 (10) ◽  
pp. 1-5 ◽  
Author(s):  
Bin Li ◽  
Shuo Zhang ◽  
Guidan Li ◽  
Hongfeng Li
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Spherical Motor ◽  
Synthesis Strategy

Synthetic Boundary Conditions for Analytical Magnetic Field Analysis of Halbach Magnet Arrays

2013 ◽  
Vol 416-417 ◽  
pp. 373-378
Author(s):  
He Yun Lin ◽  
Ping Jin ◽  
Shu Hua Fang
Keyword(s):  
Magnetic Field ◽  
Boundary Conditions ◽  
Permanent Magnet ◽  
Analytical Solutions ◽  
Scalar Potential ◽  
Surface Current ◽  
Field Analysis ◽  
Magnetic Field Analysis

This paper presents a kind of synthetic boundary conditions for the analytical magnetic field analysis of Halbach magnet array, which are derived from the linear demagnetization characteristic and the equivalent surface current of permanent magnet (PM). With the proposed synthetic boundary conditions, boundaries of Halbach PM array are simplified to only two surfaces. As a result, a relatively simple analytical solutions of Halbach magnetization topology based on the magnetic scalar potential (MSP) are obtained.

A novel analytical calculation of magnetic field in the slotted air gap of spoke-type permanent-magnet machines using conformal mapping

2020 ◽  
pp. 1-15
Author(s):  
Jianqi Li ◽  
Yu Zhou ◽  
Jianying Li
Keyword(s):  
Magnetic Field ◽  
Conformal Mapping ◽  
Permanent Magnet ◽  
Flux Density ◽  
Analytical Method ◽  
Electromotive Force ◽  
Analytical Calculation ◽  
Air Gap ◽  
Permanent Magnet Machines ◽  
Peak Value

This paper presented a novel analytical method for calculating magnetic field in the slotted air gap of spoke-type permanent-magnet machines using conformal mapping. Firstly, flux density without slots and complex relative air-gap permeance of slotted air gap are derived from conformal transformation separately. Secondly, they are combined in order to obtain normalized flux density taking account into the slots effect. The finite element (FE) results confirmed the validity of the analytical method for predicting magnetic field and back electromotive force (BEMF) in the slotted air gap of spoke-type permanent-magnet machines. In comparison with FE result, the analytical solution yields higher peak value of cogging torque.

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