JPH02197233A - Electrical rotating machine - Google Patents

Abstract

PURPOSE:To facilitate the assembly operation of an armature coil by dividing the slot wedge in a core in the transverse direction and by spreading said wedge to bias and fix said coil. CONSTITUTION:A slot wedge 10 is composed of a slot wedge body 11 and spacers 12, and said slot wedge body 11 engages the wedge groove 4 of a core and is divided into two parts having inclined faces 11a, 11b in their parting faces. Said spacers 12 are divided and arranged up and down between the parting faces of the slot wedge body 11 and their upper and lower side faces engage said inclined faces 11a, 11b, respectively. In this case, after a slot 5 has been fitted with an armature coil 1, the slot wedge body 11 and spacers 12 are inserted into the wedge groove 4 and an insulating bolt 13 is tightened into the tapped hole 14 of said spacers 12. The upper and lower spacers 12 approach together by said tightening while the space between left and right slot wedge bodies 11 spreads by engagement of said inclined faces so that said bodies move downward along the inclination of the wedge groove 4 and the armature coil 1 is uniformly biased and fixed by the slot wedge 10. Thus, the assembly operation can be conducted easily without damaging the insulation of said armature coil.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a rotating electrical machine, and relates to an improvement in a structure for fixing windings in an iron core slot.

(Prior art) Generally, for example, in an armature coil of a rotating electrical machine, a pre-formed armature coil is installed in a slot groove provided in a rotor core, and a wedge is inserted into a wedge groove provided in a slot opening. It is common practice to fix the armature coil by

In this case, the armature coil to be installed is one or more wire-insulated wire coils bundled together and ground-insulated with an insulating tape or the like. At this time, the finished dimensions of the armature coil may vary depending on the winding angle and tensile force of the insulating tape, so when the armature coil is installed in the slot, it may not be possible to secure it with the slot wedge, or it may be difficult to insert the slot wedge. There is.

That is, in this type of armature coil, the ground insulation is formed by winding multiple layers of one or more types of insulating tape, so the finished height may be larger or smaller than the designed dimension.

When the finished heights of the armature coils differ in this way, a gap is created between the armature coil 1 and the slot wedge 2, as shown in FIGS. cannot be fixed.

(Problem to be Solved by the Invention) For this reason, it is necessary to insert an insulating spacer 3 between the slot wedge 2 and the armature coil 1 to press and fix the armature coil 1. It takes a lot of time to select and adjust the thickness of the insulating spacer 3 depending on the height. Contrary to the above, if the finished height of the armature coil 1 is larger than the design dimension, the insulation of the armature coil 1 may be damaged at the tip of the slot wedge 2 when inserting the slot wedge 2 into the wedge groove 4. However, there was a risk of voltage resistance failure and even a ground fault.

On the other hand, in Japanese Utility Model Application No. 62-9154.2, the height of the armature coil 1 is manufactured in advance to be smaller than the depth of the slot 5, as shown in FIG. 3 and 6, insert a slotted wedge 8 with a screw hole 7 provided in the radial direction of the iron core into the wedge groove 4, and
An insulating bolt is screwed into the armature coil 1 to press and fix the armature coil 1 through insulating spacers 3 and 6. This was considered to be quite effective, but since the screws are used to press the armature coil 1, it results in a concentrated load, so even if the insulating spacers 3 and 6 are used, the entire armature coil 1 cannot be pressed uniformly. The thickness of the insulating spacers 3 and 6 had to be adjusted depending on the existence of loosely fixed parts and the dimensions of the armature coil, which did not result in a reduction in man-hours.

Note that the reference numeral 9 in FIG. 8 indicates an air duct.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a rotating electric machine that does not damage the insulation of an armature coil when inserting a slot wedge, presses the armature coil uniformly, and does not require adjustment man-hours. There is a particular thing.

[Structure of the Invention] (Means for Solving the Problems) In the present invention, a slot and a wedge groove are provided in the iron core, and a coil fitted into the slot is pressed and fixed by a slot wedge inserted into the Ill' groove. In rotating electric machines, the slot wedge is divided horizontally and expanded in the infarction groove, or a retractable tube is inserted into the bottom of the slot and fluid is press-fitted into it to press and fix the coil. be.

(Function) After fitting the coil into the slot, insert the slot wedge divided laterally into the wedge groove, spread this slot wedge laterally in the wedge groove, and insert the iron core along the slope of the engaged wedge groove. radially downward, thereby pressing and fixing the coil from above, or by inserting a shrinkable tube into the bottom of the slot, inserting the coil, inserting a slot wedge into the test tube, and then inserting the shrinkable tube into the bottom of the slot. Fluid is forced into the coil to increase its volume, which pushes the coil up and into the slot wedge, fixing it.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing details of the slot portion of an embodiment of the present invention, FIG. 2 is a side view of the air duct portion of FIG. 1, and FIG. 3 is a section A of FIG. 1. It is an enlarged view of.

As shown in FIGS. 1 to 3, an armature coil 1 is fitted into the slot 5, and the armature coil 1 is pressed and fixed by a slot wedge 10 inserted into the wedge groove 4. Here, the slot wedge 10 is composed of a slot wedge main body 11 and a spacer 12, and the slot wedge main body 11 engages with the wedge groove 4 of the iron core and is divided into left and right halves, with the dividing surface being viewed in the thickness direction. It is formed into a convex shape having inclined surfaces 11a and 11b with the top at the center. In addition, the spacer 12 is connected to the thrower 1 to
It is arranged in two parts vertically between the divided surfaces of the oar main body 11, and the upper one is formed so that its side surface engages with the inclined surface 11a, and the lower one is formed so that its side surface engages with the inclined surface 11t). A screw hole 14 for an insulating bolt 13 is provided along the radial direction of the iron core.

Next, a method of inserting the above-mentioned slot 111 into the wedge groove 4 will be explained. @After installing the machine coil 1 in the slot 5, insert the slot wedge body 11 and the spacer 12 into the wedge groove 4, and screw the insulating bolt 13 into the screw hole 14 of the spacer 12 as shown in Fig. 4(a). Tighten with. By tightening this insulating bolt 13, the upper and lower spacers 12 approach each other, and at the same time, the left and right slot wedge bodies 11 engage with the inclined surfaces.
, and move the armature coil 1 into the slot pj! as shown in FIG. 10 to uniformly press and fix.

According to the above configuration, the armature coil can be press-fixed by simply tightening the insulating bolt, and there is no need to select an insulating spacer due to manufacturing variations in the armature coil. There is no damage to the insulation, making it easier to assemble the armature coil.

Note that the present invention is not limited to the embodiments described above, and can be implemented in various modifications. FIG. 5 is a sectional view showing details of the slot portion of another embodiment of the present invention, and FIG. 6 is a side view of FIG. 1 showing the air duct portion.

As shown in FIGS. 5 and 6, the closed side of the slot 5 (
An insulating spacer 15 is inserted into the bottom), a shrink tube 16 (insulating oil is press-fitted inside) is inserted into the top of this, and the armature coil 1 is fitted into the top of the shrink tube 16.
This armature coil 1 is pressed and fixed by a slot wedge 2 inserted into a wedge groove 4. Here, the shrink tube 16 is made of a material such as Teflon that is not hardened by resin.

Next, a method of pressing and fixing the armature coil 1 fitted into the slot 5 will be described. An insulating spacer 15 is inserted into the bottom of the slot 5, a contraction duplex 16 is inserted into the upper part of the insulating spacer 15, an armature coil 1 is fitted onto the upper part, and a slot wedge 2 is inserted into the wedge groove 4.

Thereafter, insulating oil is supplied from the outside to the shrink tube 16 and press-fitted, and the armature coil 1 is pushed up and pressed against the slot wedge 2 to be fixed. The insulating oil press-fitted into the shrinkable tube 16 is kept sealed as is. In this case, since there is no bottom of the slot 5 in the air duct 9 shown in FIG.
Otherwise, it would expand downward, but since the insulating spacer 15 is present at the bottom of the shrink tube 16, the armature coil 1 can be pushed up and pressed against the slot wedge 2 and fixed in the same manner as the slot 5 in the iron core. Therefore, even if the air duct 9 exists, the armature coil 1 can be uniformly connected to the slot wedge 2.
It can be fixed by pressing it.

According to the above configuration, there is no need to adjust the pressure of the armature coil, the insulation of the armature coil is not damaged when inserting the slot wedge, and the assembly work of the armature coil becomes easy. In addition, if the insulation of the armature coil deteriorates over time or if a ground fault occurs in the armature coil for some reason, the armature coil should be lifted from the slot and replaced. Although it takes a lot of time to insert arrows between the coils because there is no space, there is also the advantage that by press-fitting insulating oil into the insulating tube, the armature coil can be lifted up and replaced.

[Effect of the invention 1 As explained above, according to the present invention, when the armature coil fitted in the slot is pressed and fixed, the insulation of the armature coil is not damaged and the armature coil is evenly pressed and fixed. Moreover, it is possible to provide a rotating electrical machine that does not require complicated operations such as selection and adjustment of parts to be used due to manufacturing variations in armature coils.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the slot portion of one embodiment of the present invention, and FIG.
The figure is a side view of Figure 1, Figure 3 is an enlarged view of section A in Figure 1,
4(a) and 4(b) are explanatory diagrams showing an assembly method of one embodiment of the present invention, FIG. 5 is a sectional view of the slot portion of another embodiment of the present invention, and FIG. A side view, FIG. 7 is a sectional view of a slot portion of a conventional rotating electric machine, FIG. 8 is a side view of FIG. 7, and FIG. 9 is a sectional view of a slot portion of a conventional rotating electric machine different from FIG. 7. . 1... Armature coil 2.10... Slot wedge 4... Wedge groove 5... Slot 11... Slot draft body 12... Spacer 13... Insulating port 15... Shrink tube

Claims (1)

[Claims] In a rotating electric machine in which an iron core is provided with a slot and a wedge groove, and a coil fitted into the slot is pressed and fixed by a slot wedge inserted into the wedge groove, the slot wedge is divided laterally and the coil is inserted into the wedge groove. A rotating electric machine characterized in that the coil is fixed by being pressed and fixed by expanding the coil within the slot or inserting a contractible tube into the bottom of the slot and pressurizing fluid into the tube.