scholarly journals Magnetostatic reciprocity for MR magnet design

2021 ◽  
Author(s):  
Pedro Freire Silva ◽  
Mazin Jouda ◽  
Jan G. Korvink
Keyword(s):  
Magnetic Field ◽  
Magnetic Material ◽  
Permanent Magnet ◽  
Figure Of Merit ◽  
Small Volume ◽  
Magnetic Field Intensity ◽  
Nonlinear Fem ◽  
Saturation Field ◽  
Magnet Design ◽  
Fem Simulations

Abstract. Electromagnetic reciprocity has long been a staple in MR radio-frequency development, offering geometrical insights and a figure of merit for various resonator designs. In a similar manner, we use magnetostatic reciprocity to compute manufacturable solutions of complex magnet geometries, by establishing a quantitative metric for the placement and subsequent orientation of discrete pieces of permanent magnetic material. Based on magnetostatic theory and nonlinear FEM simulations, it is shown how assembled permanent magnet setups perform in the embodiment of a variety of designs, and how magnetostatic reciprocity is leveraged in the presence of difficulties associated with self-interactions, to fulfil various design objectives, including self-assembled micro magnets, adjustable magnetic arrays, and an unbounded magnetic field intensity in a small volume, despite realistic saturation field strengths.

scholarly journals Magnetostatic reciprocity for MR magnet design

2021 ◽  
Vol 2 (2) ◽  
pp. 607-617
Author(s):  
Pedro Freire Silva ◽  
Mazin Jouda ◽  
Jan G. Korvink
Keyword(s):  
Magnetic Field ◽  
Finite Element Modelling ◽  
Figure Of Merit ◽  
Small Volume ◽  
Magnetic Field Intensity ◽  
Saturation Field ◽  
Magnet Design ◽  
Fem Simulations ◽  
Element Modelling ◽  
Linear Finite Element

Abstract. Electromagnetic reciprocity has long been a staple in magnetic resonance (MR) radio-frequency development, offering geometrical insights and a figure of merit for various resonator designs. In a similar manner, we use magnetostatic reciprocity to compute manufacturable solutions of complex magnet geometries, by establishing a quantitative metric for the placement and subsequent orientation of discrete pieces of permanent magnetic material. Based on magnetostatic theory and non-linear finite element modelling (FEM) simulations, it is shown how assembled permanent magnet setups perform in the embodiment of a variety of designs and how magnetostatic reciprocity is leveraged in the presence of difficulties associated with self-interactions, to fulfil various design objectives, including self-assembled micro-magnets, adjustable magnetic arrays, and an unbounded magnetic field intensity in a small volume, despite realistic saturation field strengths.

Development and Application of Multi-Modular Roll Magnetic Separator

2012 ◽  
Vol 472-475 ◽  
pp. 912-916
Author(s):  
Ding Guo Huang ◽  
Song Liu ◽  
Hong Guang Jiao ◽  
Fei Yue Wang
Keyword(s):  
Magnetic Field ◽  
Magnetic Material ◽  
Permanent Magnet ◽  
Magnetic Force ◽  
Economic Benefits ◽  
Magnet System ◽  
Magnetic Separator ◽  
Perfect Performance ◽  
One Machine ◽  
The Magnetic Field

This new dry magnetic separator has a special structure. It has many magnetic roll which are staggered like a stairsteps. It can finish the task of separating different minerals with only this one machine. And also it can make the different magnetic material which are in the same mineral separate at the same time. The permanent magnet system is made of large fan-shaped magnet. The magnet pole N and S are staggered and has perfect performance of magnetic separation. And the magnetic force is made full use by going-up dynamic separation. And also it gives an analysis of stress in the magnetic field. It also shows that its separation idex is better, the economic benefits are obvious, and it has broader prospects of popularization and application.

Research on the Magnetic Force of a Blood Pump Driven by Large Gap External Magnetic Field

2012 ◽  
Vol 271-272 ◽  
pp. 1636-1640
Author(s):  
Xiao Yan Tang ◽  
Zhong Yun ◽  
Chuang Xiang
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Magnetic Force ◽  
Permanent Magnets ◽  
Magnetic Field Intensity ◽  
Current Theory ◽  
Calculation Model ◽  
Blood Pump ◽  
Single Turn ◽  
The Magnetic Field

The calculation model of the single turn rectangle current carrying coil was established. The theoretic formula for calculating the magnetic field intensity of any point in space was derived. For a pair of radial magnetizing permanent magnets, the formula for calculating the magnetic force of permanent magnet in the magnetic field was deduced based on the equivalent current theory of permanent magnet. According to the formula, the influencing factors and the changing rules for the magnetic force of permanent magnet can be seen directly: the current, the coil turns are proportional to its magnetic force, while the coupling distance is inversely proportional to its magnetic force.

Blower Motor 4 Poles 2 Brushes with 14 Slots Armature for Automotive Heating, Ventilating, and Air Conditioning (HVAC) Applications

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Huu Nghia Trinh ◽  
Terry Wilson ◽  
Tan Dao Bui
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Field Intensity ◽  
Motor Performance ◽  
Air Conditioning ◽  
Magnetic Field Intensity ◽  
Dc Motor ◽  
Hvac System

This is a discussion on the method of developing a permanent magnet, 4 Pole 2 brushes DC blower motor for use in a vehicle HVAC system. By modifying the magnet orientation in terms of pole alignment, magnetic field intensity, armature winding technique, and brush alignment, the motor mass and volume is reduced 15% to 30%. These improvements are achieved without reducing motor performance, increasing motor cost or increasing motor brush noise. Keywords: 4 Poles 2 Brushes DC motor; Armature Winding; Improved Lap Winding; Weight; Performance;

Simulation and Optimization of an Octagonal Halbach Permanent Magnet Array for Small-Size NMR

2014 ◽  
Vol 543-547 ◽  
pp. 509-513 ◽  
Author(s):  
Qiao Yan Chen ◽  
Guang Cai Zhang ◽  
Ya Jie Xu ◽  
Yan Chang ◽  
Hui Wang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Permanent Magnet ◽  
Magnetic Field Strength ◽  
Small Volume ◽  
Simulation And Optimization ◽  
Magnetic Field Homogeneity ◽  
Field Homogeneity ◽  
Design And Manufacture ◽  
The Magnetic Field

Halbach magnet array has advantages of its small size and yokeless, so it has been widely used in various areas. In this paper, two Halbach permanent magnet arrays for small-size NMR with cube and octagonal shape, respectively, were compared in parameters of average magnetic field strength, field homogeneity and volume with the same material consumption. It was found that the octagonal shape magnet has better performance than the cube one. Then the field homogeneity optimization for octagonal magnet was performed. By analysis of magnetic field strength, the best homogeneity in 5mm DSV (Diameter of Spherical Volume) with 133.4ppm was achieved when the height of magnetic blocks is 16.25mm. After optimization, the magnetic field homogeneity has been significantly improved when the shape of magnet has small volume. This result laid a foundation for the design and manufacture of the octagonal Halbach permanent magnet array in small size.

Simulation Study on Magnetic Field Characteristics of High Magnetic Field Intensity Permanent Magnet Magnetic Filter

2010 ◽  
Vol 97-101 ◽  
pp. 2622-2627
Author(s):  
Hong Guang Jiao ◽  
Peng Liu ◽  
Zhan Xu Tie
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Field Intensity ◽  
Magnetic Field Intensity ◽  
Magnetic Circuit ◽  
Magnetic Filter ◽  
Circuit Structure ◽  
Magnetic Induction Intensity ◽  
The Magnetic Field ◽  
Outside Diameter

To solve the conflict between separation space and magnetic field intensity, an original magnetic circuit structure system of permanent magnet magnetic filter is designed by utilizing multi-dimensional magnet extrusion technologies, with multi-block NdFeB magnets of different structures and magnetization directions. The inside diameter of the ring magnets and ring soft iron is taken as separating space. To inspect the distribution of the magnetic field characteristics of magnetic circuit system, mathematical model is established, and the designed magnetic circuit system is simulated, taking advantage of the electromagnetic software Magnet. The simulation results show that a larger separating space and higher background magnetic density can be achieved simultaneously by means of the organic magnetic circuit system design, when the thickness of ring soft iron is 4mm and the diameter ratio (outside diameter to the diameter) of ring magnets is 10/3. The highest magnetic induction intensity of 29.2 mm separating space is 1.5T, which provides the basis for permanent magnet magnetic circuit design.

Study on Synergistic Scale Inhibition Performance of the Rare-Earth Permanent Magnetic Material and Polyaspartic Acid

2011 ◽  
Vol 239-242 ◽  
pp. 707-711
Author(s):  
Zhen Fa Liu ◽  
Han Shuo Liu ◽  
Li Hui Zhang ◽  
Mei Fang Yan
Keyword(s):  
Magnetic Field ◽  
Magnetic Material ◽  
Rare Earth ◽  
Water Treatment ◽  
Magnetic Field Intensity ◽  
Water Hardness ◽  
Polyaspartic Acid ◽  
Inhibition Effect ◽  
Scale Inhibition ◽  
Inhibition Performance

The synergistic scale inhibition effect of rare-earth permanent magnetic material and polyaspartic acid is studied. The performance of synergistic scale inhibition is studied in different magnetic field intensity, water hardness and rate of concentration. Static and dynamic scale inhibition tests show that the two water treatment ways have good synergistic scale inhibition effect. The scale inhibition performance of polyaspartic acid can be increased greatly by the magnetization of water.

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