JPH0528726Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a winding frame for a solenoid coil of a magnet for generating a highly uniform magnetic field, such as a magnet for MRI.

[Conventional technology]

FIG. 3 is a cross-sectional view of a conventional solenoid coil winding frame cut in the axial direction, and FIG. 4 is an example of a cross-sectional view of the solenoid coil winding frame of FIG. 3 cut in a direction perpendicular to the axis. In the figure, 1 is the winding frame for the solenoid coil, 4 is the machining allowance that is cut and removed by machining to ensure the roundness of the winding surface of the winding frame, and 3 is the machining allowance that is removed by cutting and removal. This is a solenoid coil wound on a perfectly circular winding frame 1.

Next, an example of a method for manufacturing the winding frame will be explained. In Figures 3 and 4, 1 is a solenoid coil winding frame using a hollow cylindrical tube or a cylindrical tube made by rolling bending a flat plate, and 3 is a coil that requires roundness to generate a highly uniform magnetic field. The solenoid coil 4 is a machining allowance for removing irregularities on the surface of the winding frame 1 in order to process the surface around which the solenoid coil 3 is wound into a perfect circle.

The outer diameter of the solenoid coil winding frame 1 before cutting is:
The diameter of the winding required by the solenoid coil has a cutting allowance that can ensure the diameter of the winding required by the solenoid coil even when the distortion of the outer diameter of the winding frame before cutting is maximum. When the solenoid coil winding frame is completed, the winding frame is usually a hollow cylindrical tube with a thickness of the winding frame material that can secure the thickness necessary for strength as a winding frame, or a cylindrical tube made by roll bending a flat plate. The outer periphery is machined using a cutting machine such as a cutting lathe to obtain the required outer diameter and roundness of the solenoid coil. In addition, in cases where the solenoid coil winding frame is thin, reinforcement to prevent distortion is attached to the inner surface of the winding frame to prevent deterioration of roundness due to cutting resistance during machining.

[The problem that the idea aims to solve]

Conventional solenoid coil frames, being constructed as described above, have the following drawbacks: the frame needs to be machined to ensure the roundness of the surface on which the wire is wound; the frame material needs to be thick enough to accommodate the amount of material removed by machining to ensure the mechanical strength of the frame after cutting; and, if cutting resistance causes distortion of the frame, reinforcement is required to prevent distortion.

This idea was made to eliminate the above-mentioned drawbacks of the conventional winding frame.By attaching a spacer for correcting roundness to the surface of the part of the winding frame where the winding is to be performed, the surface on which the winding is to be performed is To provide a winding frame for a solenoid coil that ensures the required roundness.

[Means to solve the problem]

The winding frame for a solenoid coil according to the present invention ensures roundness by attaching, for example, a spacer for correcting roundness to the surface of the part of the winding frame where the winding is to be performed.

[Effect]

The mechanical strength of the solenoid coil winding frame of this invention is ensured by the thickness of the material because no cutting is required, while the roundness is ensured by the thickness of the material to ensure high uniformity.
This is ensured by a roundness correction spacer.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a sectional view taken in the axial direction of a solenoid coil winding frame according to the present invention, and FIG. 2 is a sectional view taken in the direction perpendicular to the axis of FIG. In the figure,
1 is a solenoid coil winding frame; 2 is a roundness correction spacer attached to the surface of the solenoid coil winding frame in multiple layers, for example by pasting; 3 is a spacer wound on the roundness correction spacer 2 of the winding frame; It is a solenoid coil.

Next, an example of a method for manufacturing a winding frame according to the present invention will be explained. In Figures 1 and 2, 1 is a solenoid coil winding frame using a hollow cylindrical tube having the thickness required for work and mechanical strength, or a cylindrical tube made by roll bending a flat plate, and 2 is the above-mentioned winding frame. In order to ensure the roundness of the surface of frame 1 on which the winding is applied, a spacer for roundness correction is divided and installed as necessary, and 3 is for the solenoid coil whose roundness is corrected by spacer 3. This is a solenoid coil for generating a highly uniform magnetic field, which is wound on a winding frame 1. hollow cylindrical tube,
Or, the outer diameter of the solenoid coil winding frame 1 made by roll bending a flat plate is whether the diameter of the perfect circle circumscribing the most convex part of the outer diameter of the winding frame is equal to the winding diameter required by the solenoid coil. Or make it smaller. This winding frame 1 is usually attached to a rotatable machine having the same rotating shaft as the winding frame 1, and while rotating the winding frame 1, the position of the most convex part on the surface of the winding frame and this most convex part are adjusted. Measure the depth of each part with respect to the circumscribed perfect circle with a measuring device such as a dial gauge, and paste the roundness correction spacer 2 according to the depth and depth range at the concave position on the surface of the reel. After correcting the roundness of the winding surface of the winding frame by attaching it in one layer or in multiple layers, the roundness correction spacer 2 is installed around the entire circumference so that the diameter of the winding frame required by the solenoid coil 3 is obtained. Installed uniformly. Therefore, according to the present invention, machining as in the conventional method is not required, and manufacturing becomes easy.

In addition, in the above embodiment, a case is shown in which one solenoid coil 3 is wound on the winding frame 1, but in the case where a plurality of divided solenoid coils having the same center are wound on the upper surface of the winding frame 1. However, it can be adjusted using the roundness correction spacer 2.

In addition, it is possible to wind the solenoid coils by shifting the centers of the multiple divided solenoid coils by several millimeters.
It can also be adjusted using spacer 2 for correcting roundness.
In addition to being able to correct the roundness of the winding surface of the winding frame by adjusting the installation location and number of spacers 2 for roundness correction, it is also possible to correct the roundness of the winding surface of the winding frame. By uniformly attaching the spacer for adjusting the diameter around the entire circumference, there is also the effect that the diameter of the surface of the winding frame on which the winding wire is applied can also be corrected.

[Effect of idea]

As described above, according to the present invention, the roundness of the solenoid coil winding frame is corrected by attaching a spacer for roundness correction, so machining for roundness correction is not required. In addition, since no cutting allowance is required, welding work and machining costs are reduced by reducing the thickness of the reel material, material costs are reduced, work schedules are shortened, and the weight of the reel is reduced, resulting in high roundness. This has the effect of making the winding frame inexpensive and in a short process.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a solenoid coil winding frame according to an embodiment of the invention, Fig. 2 is a cross-sectional view thereof, Fig. 3 is a longitudinal cross-sectional view of a conventional solenoid coil winding frame, and Fig. 4 is a longitudinal cross-sectional view of a winding frame for a solenoid coil according to an embodiment of the present invention. FIG. In the figure, 1 is a solenoid coil winding frame, 2
3 is a spacer for correcting roundness, and 3 is a solenoid coil for generating a highly uniform magnetic field. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A feature is that spacers for roundness correction are attached in one layer or in multiple layers on the surface of the recess between the cylindrical winding frame around which the coil is wound and the perfect circle circumscribing the most convex part of the outer diameter of the cylindrical winding frame. Winding frame for solenoid coil.