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Alternating intense magnetic field instrument

A strong magnetic field, alternating current technology, applied in the direction of magnets, magnetic objects, magnetic cores/yokes, etc., can solve problems such as unfavorable development of high-speed magnetic storage devices

Inactive Publication Date: 2011-09-28
SUN YAT SEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is very unfavorable for the development of high-speed magnetic memory devices

Method used

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Embodiment Construction

[0021] The present invention has been concretely implemented, and a prototype machine has been developed. The magnetic field generator adopts the annular iron core made of polycrystalline soft magnetic film material, according to figure 2 The structure shown is cut into a vertical magnetic field generator. This iron core has a response frequency above 100kHz, low high-frequency magnetic loss, and a saturation magnetic induction Bs of 1.4T. The specific cutting size is air gap δ=1.5mm, the cross-sectional size of the iron core is W=H=30mm, the size of the tapered magnetic pole surface is a=4mm, b=10mm, the height of the tapered magnetic pole is h=20mm, and the other magnetic pole is The through-hole diameter φ = 7mm. An enamelled copper coil is wound on a cut and shaped iron core.

[0022] The "alternating current source" and "forward / reverse peak ratio regulator" are realized by selecting general electronic components. The maximum peak current of the alternating current s...

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Abstract

The invention discloses an alternating high magnetic field instrument, which allows current to be transformed into magnetic field, comprising a magnetic field generator, an alternating current source, a regulator of the ratio of the peak forward value to the peak inverse value and an adjustable capacitor, which are connected to form a LC series loop according to the attached drawing 1 in the abstract. When the instrument works at the LC series resonant frequency, the inductive reactance of the coil offsets the capacitive reactance of the capacitor. The load is only the small internal resistance of the coil of the magnetic field generator, so a large current source with low voltage can be used to drive. The magnetic field generator has two structures of vertical and longitudinal magnetic field generators. The implemented vertical magnetic field generator enables the alternating strong magnetic field with a peak value of nearly ten thousand oersted, a changing frequency of over thousandhertz and adjustable ratio of the peak forward value and the peak inverse value in the air gap space of the mm scale. The alternating current source has the function of frequency sweep, thereby enables to search for the resonant frequency of the LC series loop and lock the LC series loop to oscillate at the resonant frequency; the alternating current source also has the function of external synchronizing trigger, thereby enables to generate an alternating high magnetic field with the same frequency as the external trigger signal.

Description

technical field [0001] The invention relates to an electro-magnetic conversion device for converting current into a magnetic field, in particular an alternating strong magnetic field instrument capable of generating a strong magnetic field in a millimeter-scale air gap space. Background technique [0002] Magnetic fields play a very important role in modern science and technology. DC strong magnetic fields are widely used in nuclear magnetic resonance instruments, high-energy ring electron accelerators, maglev trains and scientific research. At present, the use of superconducting coils has been able to generate tens of tesla DC strong magnetic fields in centimeter-scale space. On the other hand, high-frequency alternating magnetic fields are widely used in information magnetic storage devices, such as computer disks. However, the alternating strong magnetic field generated by the magnetic head only exists in the micro space tens of microns away from the magnetic pole surfa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F7/00H01F13/00H01F3/00
Inventor 赖天树刘晓东高瑞鑫
Owner SUN YAT SEN UNIV
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