SU1755168A1 - Magnetic system for magnetic analyzer - Google Patents

Abstract

The invention relates to analytical instrumentation and can be used in the development and use of analyzers equipped with a magnetic (M) system to create a uniform M field, for example, in M gas analyzers, NMR tomographs and the other. The aim of the invention is to increase the efficiency of the M system in by improving the uniformity of the M floor. Each section of the field-creating coils is made of two single-turn single-layer discs wound from one piece of wire. Each half-turn of the disk is made in the form of a semi-circle and is conjugated with the previous half-turn. The radii of these strands differ from each other by half the thickness of the wire. 3 il.

Description

The invention relates to technical physics, in particular to analytical and medical instrumentation, and can be used in the development and operation of devices designed to study magnetic properties, for example, in computational NMR imaging. In particular, the invention will find application in the construction of magnetic systems providing a uniform magnetic field in volume for the object under study.

The purpose of the invention is to increase the efficiency of the magnetic system by improving the uniformity of the magnetic field.

FIG. 1 shows a diagram of an electromagnet of a magnetic system; in fig. 2 is a scheme for winding a section of a small coil in FIG. 3 is a view A of FIG. 2 (transition of turns from disk to disk).

The main element of the device containing the recording system, for example, a tomograph, is a camera with

magnetic system. The magnetic system is an electromagnet made in the form of four coaxially mounted coils 1 — small 2 and large 3 — mounted on the frame 1. The coils are electrically connected according to the design of the coils and the frame does not contain ferromagnetic parts. Cooling coils - directly water. Each coil consists of six coaxially arranged sections, glued into one whole - the coil, and filled with compound. Electrical connection of sections in the coil — according to a series Each section has independent water cooling. The small coil section is made of a single solid piece of hollow wire having pins 4 and 5. This section consists of two single-layer multi-turn disks. Pin 4 belongs to one disk and pin 5 belongs to another. The direction of winding in one disk (as it is

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seen in FIG. 2) opposite the direction of winding in another disk. The connection b of two discs is shown in FIG. 3. This connection is on the coil of the smallest diameter and is the midpoint of the section wire. Semi-turn 7 has a radius equal to R - L / 2 (along the inner generator), where L is the thickness of the wire. It starts from junction point b and ends in a counterclockwise direction at point 8 of conjugation of half-turn 7 with half-turn 9 having a radius R. The center of half-turn 7 is at point Oi and the center of half-turn 9 is at point O. Half-turn 9 ends at point 10 his half-turn 11, whose center is located at the point O, and the radius is R + D / 2. Thus, each half-turn of a single-layer disc is made in the form of a semicircle and adjoins the previous half-turn, each subsequent half-turn having a radius that differs from the previous half-turn radius by half the thickness of the wire in the radial direction of the Disk in which; 9, 11, and so on ends with pin 4. The second disk of this section has a beginning at the connection point, but is wound in the opposite direction and ends with pin 5. Similarly, the sections of large coils are wound.

The coil is fabricated in the following sequence: winding and sintering the sections, assembling and sintering the coil; fill and paint coil

The winding of sections is carried out on a machine with a horizontal arrangement of the faceplate and technological mandrel. Biv stages are typical electrotechnical processes. As already noted, the winding of a small coil section starts from the middle of a segment intended for winding a pseudo section.

the wires for the upper layer are fixed on the mandrel and the lower layer is wound, after which the interlayer insulating layer is laid on it and the second

layer, while the direction of rotation of the faceplate is reversed. When the winding is completed, the section is pressed between the steel plates and sintered. A coil is manufactured from prefabricated sections.

In accordance with the steps biv, the manufacture of a large coil section begins with the soldering of two pieces of wire intended for winding the sections of the small coil. Further production of a large coil is no different from production of a small one.

During operation, a current source is connected to the magnetic system installed on the tomograph camera frame. A magnetic field with increased spatial homogeneity is created in the chamber, which makes it possible not to use a special correction.

Claims (1)

Invention Formula A magnetic system made in the form of coaxially arranged coils, each section of which contains two single-layer multi-turn disks made of a single wire, the direction of winding in one disk is opposite to the direction of winding in another disk, characterized in that, in order to increase the efficiency of the magnetic system by improving the uniformity of the magnetic field, each half-turn of a single-layer r / leg disk is made in the form of a semicircle and is conjugated with the previous half-turn, each subsequent half-turn has a radius that differs from the radius of the previous half-turn by half the thickness of the wire in the radial direction, X AND AND Fig 2