JPH0340582B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a field winding device for a rotor, and more particularly to a field winding device for a rotor having an inter-pole connection wire that connects field windings of husband and wife poles. It is something.

Conventional examples of field winding devices are shown in FIGS. 1 to 3. As shown in the figure, the field winding device includes field windings 1 wound around each pole, connecting these field windings 1, and radially outwardly connecting the field windings 1. The inter-electrode connecting line 2 is formed in a curved shape, and on the outer side of the inter-electrode connecting line 2, so as to prevent the outward movement of the inter-electrode connecting line 2 due to the centrifugal force in the direction B shown by the arrow in the figure. It also consists of spacing pieces 3, 4, etc. provided in contact with the inter-electrode connecting line 2. In the field winding device configured in this way, the inter-pole connecting wire 2 is formed by laminating connecting pieces 5 made of copper or copper alloy, and connecting the central part P.
A curved portion 6 is provided at the end to provide flexibility, and both ends Q are brazed to each other (see Fig. 1). This is designed to prevent overheating due to the current flowing between the poles of the field winding 1, and to have flexibility against expansion and contraction.

Conventionally, the curved portion 6 at the center of the inter-electrode connecting wire 2 was held down by a spacing piece 3 having a flat bottom (see FIG. 2). In such a structure, if the inter-electrode connecting wire 2 extends in the radial direction shown by arrow A in the figure due to centrifugal force B due to high-speed rotation or thermal expansion due to energization, the inter-electrode connecting wire 2 will As shown by the two-dot chain line in the figure, the elongation suppressed by the flat bottom of the spacing piece 3 spreads to the left and right, and the field winding 1
There was a risk that the field winding 1 and the inter-pole connecting wire 2 would be electrically short-circuited and the field winding 1 would be damaged.

As an alternative to this, it is pressed by a spacing piece 4 having a concave portion with the same radius of curvature as the semi-curvature C of the curved portion 6 at the center of the connecting wire 2 (see Fig. 3).
However, in such a structure, if the inter-electrode connecting wire 2 is stretched in the radial direction shown by arrow A in the figure due to centrifugal force B due to high-speed rotation or thermal elongation due to energization, the spacing piece 4 The curved part 6 at the center of the connecting line 2 is pressed down over the entire surface, and the extension of the connecting line 2 extends to the central part D of the straight part, as shown by the two-dot chain line in the figure. Freely deform, expand and contract with
There was a concern that the inner side would be bent and that this would become the starting point for fatigue failure. Note that in FIGS. 2 and 3, 7 is the winding end of the field winding 1.

The present invention has been made in view of the above points,
The object is to provide a field winding arrangement for a rotor having reliable spacing pieces that do not interfere with the flexibility of the interpole connecting wires.

That is, the present invention is characterized in that the surface of the spacing piece that comes into contact with the connection line between poles is formed into a recessed portion having a radius of curvature larger than the radius of curvature of the connection line between poles.

The present invention will be explained below based on the illustrated embodiments. FIG. 4 shows an embodiment of the present invention. Note that parts that are the same as those in the conventional model are given the same reference numerals, and therefore their explanations will be omitted. In this embodiment, the surface of the spacing piece 8 that comes into contact with the inter-electrode connecting line 2 is formed into a recessed portion having a radius of curvature E larger than the radius of curvature C of the inter-electrode connecting line 2.
By doing this, when the inter-electrode connecting wire 2 extends in the radial direction indicated by the arrow A in the figure due to centrifugal force B indicated by the arrow in the figure or thermal elongation due to energization, the central part of the inter-electrode connecting wire 2 The curved portion 6 extends along a radius of curvature E that is larger than the radius of curvature C of the curved portion 6 at the center of the connecting line 2 between poles, as shown by the two-dot chain line in the figure. There will be no sharp bends on the inside. Therefore, the reliability of the inter-electrode connecting wire 2 can be made high without impairing its flexibility.

As described above, in the present invention, the inter-electrode connecting line is held down by the spacing piece having a radius of curvature larger than the radius of curvature of the inter-electrode connecting line, so that the inter-electrode connecting line extends along the large radius of curvature of the spacing piece. In this way, it is possible to obtain a field winding device for a rotor that has no sharply bent portions and has highly reliable spacing pieces that do not impede the flexibility of the inter-pole connecting wire.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the pole-to-pole connection line of a conventional rotor field winding device; The figure is a vertical sectional side view around the pole-to-pole connection line of another example of the conventional rotor field winding device, and FIG. 4 is the pole-to-pole connection of one embodiment of the rotor field winding device of the present invention. It is a vertical side view around a line. 1... Field winding, 2... Inter-pole connection wire, 8... Spacing piece.

Claims (1)

[Claims] 1. A field winding wound around each pole, an inter-pole connection wire connecting these field windings and curved outward in the radial direction, and this inter-pole connection. a field winding device for a rotor, comprising a spacing piece provided on the outside of the inter-pole connecting wire and in contact with the inter-pole connecting wire so as to prevent the wire from moving outward due to centrifugal force; A field winding device for a rotor, characterized in that a surface of the spacing piece that comes into contact with the inter-pole connecting line is formed into a recess with a radius of curvature larger than the radius of curvature of the inter-pole connecting line.