JPH03277147A - Armature coil winding - Google Patents

Abstract

PURPOSE:To enable occupation rate to be secured and obtain an armature coil winding for achieving relaxation of electric field of an insulation layer by allowing a corner radius of a strand which is positioned at a corner part of a strand coil to be larger than that of other strands. CONSTITUTION:A plurality of strands 1 are arranged through a vertical separator 5, a strand corner part strand 6 is arranged up and down through a cross part insulation 4, a filling substance 2 is arranged at recessed and projecting parts which are formed at the upper and lower parts for forming a strand coil, and the entire strand coil is covered with an insulating layer 3, thus constituting an armature coil winding. The strand which is positioned at a corner of the strand coil is formed in any corner radius which is larger than that of the other strands.

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 at the corner can be relaxed, 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 the thickness of the strand, and by increasing the corner radius of the strand, the effective area of the strand decreases, The occupancy rate will decrease.

FIG. 3 is a sectional view of a conventional armature winding, which is an armature winding having a general Leher dislocation.

Figure 4 is an enlarged view of the upper part of Figure 3, and Figure 5 is a diagram when the corner radius of the wire is maximized for the purpose of increasing the corner radius of the wire coil. Shown for comparison.

In both FIGS. 4 and 5, 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 a smaller corner radius of the wire in order to improve the bulk factor.

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 5,
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.

Therefore, as shown in FIG. 6, between the upper and lower parts of the wire coil and the insulating layer 3, there is a filling 2 made of an insulating or semiconductive material layer having a corner radius larger than the corner radius of the wire. An armature winding having a configuration has been invented, and the corner radius of the wire coil can be formed to be large without reducing the space factor of the wire.

However, even in this invention, the space factor of the wire in the wire coil is reduced by the amount of the filler 2.

The present invention was made in view of the above-mentioned drawbacks, and only the corner radius of the strands located at the corners of the strand coil is increased, while the corner radii of the other strands are left as they were before.
It is an object of the present invention to provide an armature winding in which a space factor is ensured and an electric field in an insulating layer is relaxed.

[Structure of the Invention (Means for Solving the Problems) In order to achieve the above object, the armature winding of the present invention includes an insulating member covering the outer periphery of a strand coil formed by arranging a plurality of strands. In the armature winding, the corner radius of the wire located at the corner of the wire coil is made larger than the corner radius of the other wires.

(Function) The present invention is constructed as described above, and only the corner radius of the strands located at the corner portions of the strand coil is increased. To improve the reduction in the wire space factor of the wire and the reduction in the wire space factor of the wire coil due to the provision of extra fillers at the top and bottom of the wire coil, we can provide an arbitrary corner radius that is sufficiently larger than the corner radius of the wire to be used. It is possible to form a corner radius, and the electric field of 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 a vertical separator 5 in between, and the strands are further arranged with a cross section insulator 4 in between. Coil corner portion strands 6 are placed one above the other, and fillers 2 are placed in the uneven parts formed at the top and bottom of these to form a strand coil, and the entire strand coil is covered with an insulating layer 3 for armature winding. lines are constructed.

The filler 2 may be an insulating material, but a semiconductive filler has a greater electric field relaxation effect.

To construct such an armature winding, after molding a conventional wire coil, the corners of the wire coil located in the core insertion range are continuously ground to a desired corner radius. I can do it.

A part of the wire constituting the coil, that is, the wire located at the corner of the wire coil, is connected to other wire 1 as shown in FIG.
The corner radius can be any radius greater than the radius of the corner.

The above is an example of an armature winding having a Label transposition, or in the case of an armature winding without a Label transposition such as a multi-turn coil, it can be formed by taking advantage of the gist of the present invention. In other words, as shown in Fig. 2, after molding the bare wire coil, a part of the corner of the bare wire located at the corner of the bare wire coil is ground with an arbitrary corner radius that is larger than the corner radius of the bare wire. Any corner radius can be formed.

[Effects of the Invention] As described above, the present invention makes the corners of the wire coil located at the upper and lower portions of the wire coil larger than the corner radii of other wires, so that the corner radius of the wire coil is formed to be large. Therefore, it is possible to provide an armature winding having an excellent wire space factor and excellent insulation performance.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the main parts of an armature winding according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing a multi-turn coil according to another embodiment of the present invention, and FIGS. 3 to 6 are conventional FIG. 3 is a cross-sectional view showing the configuration of an armature winding. 1... Element wire 2... Filler 3... Insulating layer 4... Cross part insulation 5... Vertical separator 6... Element wire coil corner part element wire 7... Turn insulation

Claims (1)

[Claims] In an armature winding in which the outer periphery of a strand coil made up of a plurality of strands arranged is covered with an insulating member, the corner radius of the strand located at the corner of the strand coil is the corner radius of the other strands. An armature winding characterized by being larger.