JPH0315324B2 - - Google Patents

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to an electromagnetic coil.

[Background of the invention]

In recent years, as the scale of electron accelerators has increased, the current flowing through the electromagnetic coils for electron focusing and deflection has increased.
Although the cross-sectional area of the coil conductor is also increasing, the longitudinal dimension of the coil is limited because various observation ports and the like are installed between the electromagnetic coils. Therefore, at the end of the coil, a conductor, that is, a rectangular conductor, must be wound with a bending radius that is smaller than the cross-sectional area of the conductor, but during this winding, the cross-section of the conductor deforms into a trapezoid, and the inner side of the bending radius is the thickness of the conductor ( height) increases.

That is, in the electromagnet coil, as shown in FIG.
It is formed with a bent part at the corner. By the way, the rectangular conductor 1 is normally used with a cross section as shown in Fig. 2, that is, one having a uniform height in the width direction.
As shown in Fig. 3, the bending inner diameter side 1a increases in height due to compressive stress, and the bending outer diameter side 1b increases in height due to tensile stress, with the neutral axis approximately at the center S of the conductor width. becomes smaller, and as a whole, the height on the bending inner diameter side 1a is the largest, and the height becomes smaller toward the bending outer diameter side 1b, forming a trapezoid.

For example, if a rectangular conductor with a cross section of about 20 mm square is bent 90 degrees with a bending radius of about 50 mm, the heightwise deformation will be about 0.5 mm on one side.If this is wound and laminated as shown in Figure 1 above, the coil 4 Not only does the height of the coil become higher only at the corners, that is, the bending part, but also the winding and
This raised rectangular conductor locally hits the interlayer insulation that is the insulation between the laminated rectangular conductors, causing an interlayer short circuit.

To prevent this, it is necessary to reduce the height of the conductor at the bending part by machining before bending. Continuous winding work was not possible due to the processing of chips generated during processing, which increased the number of processing steps and significantly hindered mass production.

In order to prevent the height of the coil from increasing only in the bent part without machining, as is done in the coil head of the armature coil of rotating electric machines, the rectangular conductor created by the bending work can be There is a method of pressurizing the trapezoidal cross-section of the trapezoid so that the thickness, that is, the height, is almost the same as that of the straight section, but it is not practical to apply it to a conductor that is continuously wound, such as an electromagnetic coil.

Separately, as shown in Fig. 4, rectangular conductors 2 having a trapezoidal cross section are wound and laminated in a ring shape for the rotor terminal ring of a rotating electric machine. . In other words, the rectangular conductor 2 with a trapezoidal cross section is used to wind and laminate the rectangular conductor 2 with a lower height on the bent inner diameter side 2a and a larger height on the bent outer diameter side 2b. This is effective in the case of a rotor terminal ring with a large bending radius, but when the bending radius is small, such as in an electromagnetic coil, the straight part that is not bent is as shown in Figure 5. The cross-sectional shape of the rectangular conductor 2 in the laminated portion remains trapezoidal, and its height is greater than the height of the bent portion, so the bent outer diameter side 2b, that is, the corner of the trapezoid, bites into the insulating layer between the conductors 2. , causing an interlayer short circuit.

[Purpose of the invention]

The present invention has been made in view of the above points,
The object of the present invention is to provide an electromagnetic coil that can reduce manufacturing man-hours.

[Summary of the invention]

That is, the present invention provides an electromagnetic coil in which rectangular conductors are wound and stacked such that the cross section of the rectangular conductor to be wound is tapered from approximately the center of the width of the conductor to the inner diameter side of the bending process during winding. As a result, the rectangular conductor wound thereon has a cross section tapered from approximately the center of the width of the conductor on the inner diameter side of the bending process.

[Embodiments of the invention]

The present invention will be explained below based on the illustrated embodiments. An embodiment of the present invention is shown in FIGS. 6-8. Note that parts that are the same as those in the conventional system are given the same reference numerals, and therefore their explanations will be omitted. In this embodiment, the rectangular conductor 3 to be wound is formed so that its cross section is tapered from approximately the center S of the conductor width to the inner diameter side 3a of the conductor when it is wound. By doing so, the rectangular conductor 3 to be wound has a cross section tapered from the neutral axis at approximately the center S of the conductor width on the bending inner diameter side 3a, which makes it possible to reduce the number of manufacturing steps. A coil for an electromagnet can be obtained.

That is, the rectangular conductor 3 to be wound is formed so that its cross section is tapered so that the height of the conductor is reduced by a dimension commensurate with the amount of bending deformation only on the inner diameter side of the bending process from approximately the center of the conductor width (see FIG. 6). By winding the rectangular conductor 3 formed in this way, the bending part is formed on the inner diameter side 3a as shown in FIG.
receives compressive stress and its height becomes large, and the bent outer diameter side 3b receives tensile stress and its height decreases, but since the bent inner diameter side 3a is tapered from approximately the center S of the conductor width, Even if the height increases due to compressive stress, the height remains the same from the neutral axis approximately at the center S of the conductor width to the bending inner diameter side 3a. Therefore, rectangular conductors each having a flat surface with approximately half the conductor width at approximately the same height are stacked, and there is no local contact between the conductors 3, making the stacking stable and preventing the occurrence of interlayer short circuits. can. As shown in FIG. 8, the flat conductor 3 shown in FIG. Since the layers are stacked on the same plane, the stack is stable like the bent portion, and there is no risk of short circuit between the layers. If the rectangular conductor 3 is bent so that its cross section is tapered from the center of the width of the conductor so that the inner diameter side 3a is tapered, the conductor will be continuous even without machining during the winding and laminating work. The winding work can now be done by hand, reducing manufacturing man-hours and making mass production possible.

Although this embodiment has been described with reference to the case where the rectangular conductor 3 is a solid conductor, the present invention is not limited to this, and a hollow conductor having holes through which a cooling medium passes can be similarly implemented.

Although the rectangular conductor 3 has a rectangular cross section in the horizontal direction, it may also have a square cross section or a rectangular cross section in the vertical direction.

〔Effect of the invention〕

As described above, according to the present invention, a rectangular conductor can be continuously wound without machining, thereby making it possible to obtain an electromagnetic coil that can reduce manufacturing man-hours.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the vicinity of the bent portion of a conventional electromagnet coil, Figure 2 is a sectional view of a rectangular conductor of a conventional electromagnet coil, and Figure 3 is a rectangular conductor of a conventional electromagnet coil's bent portion. Figure 4 is a cross-sectional view of a rectangular conductor of another example of a conventional electromagnet coil, and Figure 5 is a cross-sectional view of another example of a conventional electromagnet coil. FIG. 6 is a sectional view of a rectangular conductor of an embodiment of the electromagnet coil of the present invention, and FIG. FIG. 8 is a cross-sectional view of a laminated conductor showing the state of the bent portion when the rectangular conductor shown in FIG. 6 of one embodiment is wound and laminated, and FIG. 8 is a cross-sectional view of the rectangular conductor of FIG. - It is a sectional view of a laminated conductor showing the state of a straight part without bending when laminated. 3...Flat conductor, 3a...Bending inner diameter side, 3
b...bending outer diameter side.

Claims (1)

[Claims] 1. In an electromagnetic coil in which rectangular conductors are wound and laminated, the rectangular conductor to be wound is formed such that its cross section tapers from approximately the center of the conductor width to the inner diameter side of the bending process during the winding. An electromagnetic coil characterized by: