Holbach magnet shim coil and design method thereof

A technology of shim coil and design method, which is applied to magnets, magnetic objects, permanent magnets, etc., can solve the problems of complex analysis and calculation process, long optimization time, and large calculation amount, and achieves the optimization of magnetic field uniformity and good uniformity. , the effect of power loss optimization

Inactive Publication Date: 2016-05-04
SUZHOU INST OF BIOMEDICAL ENG & TECH CHINESE ACADEMY OF SCI
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Problems solved by technology

[0004] The existing Holbach shim coil design methods include: using the separated wire method (Zhao Wei et al., Journal of Electrotechnical Society, 2010, 6-13), based on the saddle coil structure, according to the symmetry of the magnetic field in the Cartesian coordinate system Shimming coils of various orders were designed systematically, but the analysis and calculation process was complicated and not intuitive; LiuWentao et al. In the design scheme, the current source is idealized into a flow function element, and the source point is optimized by using the relationship between the flow function and the target field. However, since the source point field points are a large number of discrete points, the calculation amount is large and the optimization time is long

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  • Holbach magnet shim coil and design method thereof
  • Holbach magnet shim coil and design method thereof

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[0030] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0031] refer to figure 1 As shown, a design scheme of the target field method for a Holbach magnet shim coil, the steps are as follows:

[0032] (1) Determine the current density expression. The Fourier expansion of the current density distribution contains infinite items. In order to simplify the calculation, a finite trigonometric function is used to represent the current density, which is represented by the Q value. At the same time, according to the structural characteristics of the shim coils distributed on the cylindrical surface in the Hallbach magnet, the angular parameters of the current density function are determined by using the designed harmonic function order n, m, and the current density order l, k , axial parameter The value of , expressing the current density as the axial direction and angular direction Comb...

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Abstract

The invention discloses a Holbach magnet shim coil and a design method thereof. Aimed at the structural characteristic of a Holbach magnet and the direction of a main magnetic field, a current density function is designed flexibly according to the structural feature of the magnetic field, the relation between the current density and the main magnetic field is derived by utilizing the Biot-Savart Law, a current distribution function is inverted, and the coil structure is optimized by considering requirements for parameters including the power loss function and the linearity of the shim coil. Coils of two different structures are provided for the Halbach magnet, each coil structure has advantages and disadvantages in the aspects of structural complexity and performance, and the coils can be selected flexibly according to practical requirements.

Description

technical field [0001] The invention relates to a Hallbach magnet shim coil and a design method thereof. Background technique [0002] Due to its miniaturization and convenience, the Holbach magnet has received extensive attention from all walks of life since it was proposed in the 1980s, and has developed in NMR, magnetic levitation, and permanent magnet motors. Especially in the application of NMR, the Hallbach-type magnet can generate a single transverse uniform field, and because of its closed magnetic circuit, the leakage magnetic field is small, and it can use less magnetic materials to generate a larger magnetic field intensity. Related studies have produced a 4T transverse strong magnetic field in a circular cylindrical cavity, and Chinese researchers have also produced a 2.6T Hallbach magnet, so it has great potential in miniaturized NMR applications. However, low uniformity is the main problem restricting the application of Holbach magnets in NMR. Researchers have...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/385H01F7/02
CPCG01R33/385H01F7/0278
Inventor 徐雅洁杨晓冬陈巧燕
Owner SUZHOU INST OF BIOMEDICAL ENG & TECH CHINESE ACADEMY OF SCI
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