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In this paper, we propose an isotropic metamaterial lens (meta-lens) with an operational frequency of 8.5 MHz for imaging applications. The cubic unit cells, composed of inductor-and and capacitor-loaded split rings, are aligned in a periodic three-dimensional dimensional lattice. The meta-lens provides an effective isotropic permeability μeff = −1 at 8.5 MHz. The lens enhances the evanescent fields,...
In this paper, different types of planar permanent magnet array are studied by FEM, calculation and experiment. Then a variety of characteristic graphs are presented, conclusions obtained by analyzing these graphs will enable us to learn the arrays comprehensively and systematically. Starting with the standard Halbach array, then the effects of magnets size, Segment Numbers Per Pole, Magnet Shapes...
By analogy with Halbach permanent magnet (PM) array, a novel ironless trapezoid winding array (TWA) is designed to achieve a primarily single-sided and well sinusoidal magnetic field. After deriving the TWA's current density formula in Fourier series, via the magnetic vector potential we derive the analytical solution of its magnetic field, which is verified by ANSYS finite-element method.
The magnetic fields due to different planar Halbach permanent magnet (PM) array, including the 4 piece square array, stretched 8 piece square array and trapezoid array, are studied by analytic calculation method and FEM. On this basis, the magnetic forces over the magnet weight per array unit area are obtained. Then comparisons of above results indicate that the trapezoid array can provide the maximum...
In this paper, a novel high-precision planar magnetic levitation is proposed, which combines the advantages of Halbach PM array with the controllable maglev structure. For accurate motion control of the levitation the end-magnetic-field-effect on the stator windings is taken into account, thus the equivalent magnetic charge method is proposed to calculate the 3D end-magnetic-field and compared with...
This paper presents a new method for 3D magnetic field calculation suitable for permanent magnet which has no free current and can be treated as irrotationality. The divergence of the remanent magnetization of the Halbach PM array is introduced to help calculate magnetic scalar potential and consequent H and B. Practical calculations of 3D magnetic field comparing with ANSYS analytical results indicate...
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