Gradient field electromagnet for permanent magnet temperature coefficient open circuit measurement

A temperature coefficient and gradient field technology, applied in the field of electromagnets, can solve the problem that the size of the magnetic field and the size of the gradient cannot meet the requirements of the gradient field, and achieve the effect of reducing excitation consumption and improving resolution

Inactive Publication Date: 2014-06-25
NAT INST OF METROLOGY CHINA
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  • Abstract
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Problems solved by technology

The existing gradient field generators cannot meet the requirements of the gradient field in the ultra-low temperature coefficient permanent magnet op

Method used

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  • Gradient field electromagnet for permanent magnet temperature coefficient open circuit measurement
  • Gradient field electromagnet for permanent magnet temperature coefficient open circuit measurement
  • Gradient field electromagnet for permanent magnet temperature coefficient open circuit measurement

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Example Embodiment

[0024] The principles and features of the present invention will be described below with reference to the accompanying drawings. The examples are only used to explain the present invention, but not to limit the scope of the present invention.

[0025] like figure 1 As shown, a gradient field electromagnet for open-circuit measurement of permanent magnet temperature coefficient includes a base plate 1, an outer sleeve 2, an upper pole 3, a lower pole 4 and a coil 5;

[0026] The bottom plate 1 is a circular bottom plate, the outer sleeve 2 is fixed on the bottom plate 1, the upper pole head 3 is a cover-shaped structure with a through hole in the center, and is fixed on the outer sleeve 2, and the inner wall of the upper pole head 3 is fixed on the outer sleeve 2. The lower pole head 4 is a cylinder with a certain arc protrusion at the top, the lower pole head 4 is fixed on the bottom plate 1 , and the coil 5 is sleeved on the lower pole head 4 .

[0027] Wherein, the above te...

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Abstract

The invention relates to a gradient field electromagnet for permanent magnet temperature coefficient open circuit measurement. The gradient field electromagnet is used for providing magnetic field strength and magnetic field gradient which meet the requirements of temperature coefficient open circuit measurement in a permanent magnet temperature coefficient magnetic open circuit measurement device. The gradient field electromagnet comprises a bottom plate, an outer sleeve, an upper electrode tip, a lower electrode tip and a coil. The bottom plate is a circular bottom plate. The outer sleeve is fixed to the bottom plate. The upper electrode tip is of a cover structure with a through hole reserved in the center, and the upper electrode tip is fixed to the outer sleeve. The inner wall of the upper electrode tip is a protrusion with the certain radian. The lower electrode tip is a cylinder, wherein the top end of the cylinder is provided with a protrusion with the certain radian. The lower electrode tip is fixed to the bottom plate. The lower electrode tip is sleeved with the coil. Due to the ingenious structural design, excitation consumption outside a working area is greatly reduced, and high magnetic field gradient is obtained through a small number of field ampere-turns in the working area; meanwhile, the magnetic field strength and the magnetic field gradient which meet the requirements of temperature coefficient open circuit measurement can be provided, and the resolution ratio of temperature coefficient open circuit measurement is improved.

Description

technical field [0001] The invention relates to the field of electromagnets, in particular to a gradient field electromagnet used for open-circuit measurement of the temperature coefficient of a permanent magnet. Background technique [0002] At present, gradient fields are mainly used in magnetic resonance imaging equipment in the medical field for slice scanning. The existing gradient field generating devices cannot meet the requirements for the gradient field in the ultra-low temperature coefficient permanent magnet open-circuit measuring device in terms of the direction of the magnetic field, the magnitude of the magnetic field and the magnitude of the gradient. [0003] A magnet with a magnetic moment can only experience force along the direction of the magnetic field gradient in a non-uniform magnetic field, and only in a uniform gradient magnetic field can the force of a permanent magnet be independent of the change in position. In the research process of permanent m...

Claims

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Application Information

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IPC IPC(8): H01F7/06G01R33/12
Inventor 侯瑞芬林安利张志高范雯贺建王京平陈福三李鲲鹏
Owner NAT INST OF METROLOGY CHINA
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