JPH02197231A - Armature winding - Google Patents

Abstract

PURPOSE:To allow the insulation layer of an armature winding to be relieved from electric field by being equipped with an insulator or a member layer of semiconductivity having a corner radius greater than that of a strand between upper and lower parts of a strand coil and an insulating member. CONSTITUTION:In an armature winding a plurality of strands 1 are arranged through a vertical separator 5 and upper strands 6 are arranged through a cross section insulation 4. To the recessed and projected sections formed in the upper and lower parts of these a filler 2 composed of an insulator or a semiconducting member is arranged to complete strand coil, the whole body of which is covered with an insulating layer 3 for constitution. In this armature winding the filler 2 is made thicker than the thickness of the strand 6 situated at the upper and lower parts of the strand coil and the corner radius of the strand coil is formed larger than that of the corner radius each strand has. A sufficient corner radius can thereby be formed and an armature winding superb in space factor of the strands and superb in insulation performance can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to improving the insulation performance of armature windings.

(Prior Art) Generally, an armature winding is insulated on the outer periphery of a wire coil that constitutes the winding. Regarding the dielectric strength, which represents the insulation performance of the winding, the larger the corner radius of the wire coil, the more the electric field can be relaxed in a part of the corner, and the performance can be improved.

The corner radius of the wire coil is limited by the corner radius of the wires constituting the wire coil, and cannot be increased arbitrarily. At most, it is half the thickness of the strand. Therefore, even if you try to increase the corner radius of the strand coil, the maximum is half of the strand thickness, and by increasing the strand corner radius, the effective area of the strand decreases, and the The product moment decreases.

FIG. 4 is a sectional view of a conventional armature winding, which has a general Lebel dislocation.

FIG. 5 is an enlarged view of the upper part of FIG. 4, and is shown for comparison with FIG.

FIG. 6 is a diagram when the corner radius of the wire is maximized for the purpose of increasing the corner radius of the wire coil, and is shown for comparison with FIG. 5.

In both FIGS. 5 and 6, the wires constituting the wire coil have the same shape, and the corner radius of the wire and the corner radius of the wire coil are the same.

(Problem to be solved by the invention) In electric machines such as large generators that require large current and high voltage windings, the number of strands is increased and the proportion of strands is increased due to the large current. There is a demand for smaller corner radii of strands in order to improve the product ratio.

On the other hand, due to the high voltage, there is a demand for improved insulation performance, and there is a demand for the corner radius of the bare wire coil to be larger in terms of electric field relaxation.

In order to improve the insulation performance of the armature winding, increasing the corner radius of the wire to half the maximum wire thickness as shown in Figure 6,
The space factor of the strands decreases.

To compensate for this, the number of strands has to be increased, making the machine even more uneconomical. Moreover, the corner radius is up to half the thickness of the strand, and an arbitrary corner radius of more than half the thickness of the strand cannot be expected.

The present invention was made in view of the above-mentioned drawbacks, and the corner radius of the strands is kept the same as before to ensure the space factor, and only the corner radius of the strand coil is increased to alleviate the electric field in the insulating layer. The purpose is to provide armature windings.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the armature winding of the present invention is an armature winding in which the outer periphery of a wire coil formed by arranging a plurality of wires is covered with an insulating member. , an insulating or semiconductive member layer having a corner radius larger than the corner radius of the wire is provided between the upper and lower portions of the wire coil and the insulating member.

(Function) The present invention is configured as described above, and since a part of the corner of the wire coil can be formed by a semiconductive material layer, the corner radius of the wire can be made smaller without reducing the space factor of the wire. It is possible to form a sufficiently large corner radius, and the electric field in the insulating layer can be relaxed.

(Example) An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a cross-sectional view of an armature winding according to an embodiment of the present invention, in which a plurality of strands 1 are arranged with vertical separators in between, and an upper strand is arranged through a cross section insulator 4. 6 are disposed, and a filler 2 is further disposed in the uneven portions formed at the upper and lower portions of these to form a strand coil, and the entire strand coil is covered with an insulating layer to form an armature winding.

That is, in this embodiment, the filling material 2 shown in FIG. A radius is formed.

This filling 2 is made of an insulating material or a semiconductive material, and may be made of one kind of material as shown in FIG. They may be configured in combination. In this way, the corner radius of the wire coil shown in FIGS. 1 and 2 can be configured to be any corner radius larger than the corner radius of the wire through the member layers located above and below the wire coil. .

In addition, although the filler 2a is placed in the upper and lower portions of the wire across the entire width of the wire coil in FIG. 2, it is of course possible to limit the width to a part of the wire coil width as shown in FIG. can also be filled with filler 2.

As mentioned above, in order to increase the corner radius of the strand coil, the corner radius of the strands constituting the strand coil is increased, and new parts are added to the upper and lower parts of the strand coil without reducing the space factor of the strand. Since a material layer is provided, the corner radius of the wire coil can be configured to have an arbitrary corner radius larger than the corner radius of the wire through this material layer.

〔Effect of the invention〕

As described above, the present invention includes insulating or semiconductive material layers on the upper and lower parts of the wire coil, and the corner radius of the wire coil is formed by these material layers, so that a sufficient corner radius can be obtained. Thus, it is possible to provide an armature winding having an excellent wire space factor and excellent insulation performance.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the main parts of an armature winding according to an embodiment of the present invention, Figures 2 and 3 are modifications of Figure 1, and Figures 4 to 6 are conventional armature windings. FIG. 1...Winding, 2...Filling, 3...
・Insulating layer, 4...Cross part insulation, strands.

Claims (1)

[Claims] In an armature winding in which the outer periphery of a wire coil formed by arranging a plurality of wire wires is covered with an insulating member, there is a corner larger than the corner radius of the wire between the upper and lower portions of the wire coil and the insulating member. An armature winding comprising an insulating or semiconductive member layer having a radius.