JPS645967Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE PRESENT DISCLOSURE The present invention relates to an improvement in an end fixing device for a stator winding outside the stator core end of a rotating electric machine.

An end portion of a stator winding provided with a conventional fixing device of this kind is shown in FIG. 1 as a vertical cross-sectional view of a main part of the stator. 1
is a stator core, and both ends are held down by toothed pressers 2. 3 is a stator core extension part, 4 is a stator winding whose straight part is inserted into the slot 1a of the stator core 1 and fixed, and the upper coil end 5 and the lower coil end 6 are the stator core 1 ends. It is issued from. 7
8 are insulated coil supports attached to each of these mounting arms, and 9 and 10 are insulated support rings held by these insulated coil supports 8. , supporting each lower coil end 6 from the back. 11 is an insulating spacing piece inserted between the upper coil end 5 and the lower coil end 6; 12 is a retaining ring made of an insulating material fitted into the inner diameter of the core extension 3; and 13 is a felt-like material. , synthetic resin impregnated semi-cured retaining ring 1
3 and the lower coil end 6, and is later hardened. At a certain axial position of the retaining ring 12, between adjacent ends of each stator winding 4, there is an insulating spacer piece 1 divided into two and forming a pair.
4.15 are entered.

The fixing device portion formed by these insulating spacing pieces 14 and 15 is shown in FIGS. 2 and 3 in a front sectional view and a developed view seen from the inner diameter side. Two insulating spacing pieces 14 and 15 are inserted between adjacent ends of four stator windings with an insulating pad 16 interposed therebetween. The insulating pad 16 is made of a felt-like material, is impregnated with a synthetic resin, semi-cured, and then post-cured to protect the insulator of the stator winding 4 . The insulating spacers 14 and 15 have radial grooves 14a and 15a.
is provided, and is tied to the four ends of the stator windings by a tie string 17 made of glass fiber string or the like.

In the above-mentioned conventional device, the end of the stator winding 4 is fixed at a position close to the stator core 1 protruding from the stator core 1.
In the radial direction, the back part of the lower coil end 6 is received by the inner diameter part of the core extension part 3 via a stuffing member 13 and a retaining ring 12. Further, in the circumferential direction, insulating spacing pieces 14 and 15 are inserted between the ends of the four adjacent stator windings at the same position as the retaining ring 12 in the axial direction. These insulation spacing pieces are for integrally fixing the upper coil end 5 and the lower coil end 6 on the outside of the stator core 1, and have a height ranging from the top surface of the upper coil to the back surface of the lower coil. There is. Spacing piece 1
4 and 15 are inserted into the stator core slot 1a, so they are divided into two parts so that they can be inserted easily.The strings 17 are passed through the grooves 14a and 15a, respectively, and tied to the stator winding 4. There is. In addition, in order to protect the insulation of the stator winding 4 and improve mutual familiarity when inserting the spacers 14 and 15,
A semi-hardened insulating pad 16 is applied.

In the conventional stator winding end fixing device described above, insulating spacing pieces 14 and 15 are tied to both sides of each stator winding 4 with tie strings 16, and after a long period of time, adjacent stator windings 4 There is a possibility that a gap may be formed between the mutual contact surfaces of the two divided insulating spacing pieces 14 and 15, resulting in loosening, and the integral fixation between the stator windings 4 cannot be sufficiently maintained. In addition, the insulating spacing pieces 14 and 15, which are tightly spaced between the ends of each stator winding 4, require troublesome dimensional adjustment.

This idea involves inserting a pair of insulating spacing pieces on both sides between adjacent ends of the stator windings with a gap in between, and fixing the tapered liner between these insulating spacing pieces from the inner diameter side. Then, tie strings are passed through the tapered liner and tied to the ends of the stator windings on both sides to increase the pressing force of the insulating spacer against the fixed winding.
It is an object of the present invention to provide a highly reliable stator winding end fixing device that prevents loosening and strengthens integral fixation of stator winding ends in the circumferential direction.

FIG. 4 is a longitudinal cross-sectional view of the main parts of a stator equipped with a stator winding end fixing device according to an embodiment of this invention, and 1 to 13 and 1a are the same as the conventional device described above. . A pair of insulating spacing pieces 21 and 22 are inserted between adjacent ends of the stator winding 4 at a position relative to the axial direction of the retaining ring 12,
A taper liner 23 is driven between these two spacing pieces.

5 and 6 show a front sectional view and a developed view seen from the inner diameter side of the fixing device portion made up of the insulating spacing pieces 21, 22 and the tapered liner 23. 2
Reference numeral 4 denotes an insulating pad placed between the insulating spacing pieces 21, 22 and the 4 ends of the stator winding. This insulating pad 24 is made of a felt-like material, is impregnated with a synthetic resin and semi-cured, and is then post-cured to protect the insulation of the stator winding 4. The corresponding insulating spacing pieces 21 and 22 are thicker on the outer diameter side and smaller on the inner diameter side, tapered on the opposing sides, and formed into radial guide grooves 21a and 22a. These guide grooves 21a, 22a
The gap between them is larger on the inner diameter side than on the outer diameter side, and is formed in an inclined shape. Reference numeral 23 denotes a taper liner that is driven radially from the inner diameter side between these guide grooves 21a and 22a, and the thickness is smaller on the outer diameter side and larger on the inner diameter side, and a through hole 23a is provided in the inner diameter side in the axial direction. ing. In this through hole 23a,
A tie string 25 made of glass fiber string or the like is passed through the upper coil end portions 5 of both ends, passed through the through hole 23a of each taper liner 23 ahead of each other, and tied, and the taper liner 23 is tightened in the driving direction to secure it. There is.

In the device of the above embodiment, the insulating spacing pieces 21 and 22 are applied to the ends of both adjacent stator windings 4 via the insulating pads 24, respectively, and the tapered liner 23 is inserted into the guide grooves 21a and 22a from the inner diameter side. I'm typing along. These guide grooves 21a, 22a
This prevents the taper liner 23 from coming off in the axial direction. The height of each tapered liner 23 is set such that, by driving, the insulating spacing pieces 21 and 22 can apply a pressing force evenly to the side surfaces of the stator winding 4 that are in contact with the upper and lower coil ends 5 and 6. The tied string 25 passes through the hole 23 in the tapped taper liner 23.
a, and is tied and fixed to the upper coil end 5, and during long-term operation, the stator winding 4
This prevents removal due to vibration caused by electromagnetic force, etc.
The circumferential fixation of the stator winding 4 is maintained.

In the above embodiment, the end fixing device was provided at a position near the stator core 1 end at the 4th end of the stator winding.
It may also be applied to a position near the connection between the upper coil and the lower coil.

Further, in the above embodiment, the tie string 24 is hung on the upper coil end 5, but it may be hung on the lower coil end 6, or even on both coil ends.

As described above, according to this invention, a pair of insulating spacing pieces are inserted between the ends of adjacent stator windings with a space between them, and a taper liner is inserted between these insulating spacing pieces on the inner diameter side. Since it is driven in the radial direction from the beginning, it is possible to apply pressure force in the circumferential direction to the stator windings on both sides using the insulation spacing pieces on both sides, and to fix the stator windings in the circumferential direction. can be easily increased and the fixation between the stator winding ends is maintained sufficiently reliably.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a main part of a stator section provided with a conventional stator winding end fixing device, FIG. 2 is a cross-sectional view taken along the - line in FIG. 1, and FIG. 4th exploded view of the end fixing device shown from the inner diameter side.
The figure is a longitudinal sectional view of a main part of a stator section provided with a stator winding end fixing device according to an embodiment of the invention, and FIG. 5 is a sectional view taken along the - line in FIG. 4.
FIG. 6 is a developed view of the end fixing device section of FIG. 5 viewed from the inner diameter side. 1... Stator core, 4... Stator winding, 5...
Upper coil end, 6...Lower coil end, 21,
22... Insulating spacing piece, 21a, 22b... Guide groove, 23... Taper liner, 23a... Through hole,
24... Insulating padding, 25... Binding cord. In addition,
The same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] The stator windings are inserted between the adjacent ends of each stator winding protruding outward from the stator core end, and a gap is provided between the two corresponding to both sides, and a radial direction is formed on both opposing surfaces. are provided with guide grooves, and the gap between these guide grooves is larger on the inner diameter side than on the outer diameter side, and a pair of insulating spacing pieces on both sides are formed in an inclined shape, and the inner diameter side is thicker than the outer diameter side, It is driven radially from the inner diameter side between the guide grooves of both of the above-mentioned insulating spacers, pressing both of the insulating spacers against the sides of both of the stator winding ends, and axially driven by the above-mentioned guide grooves. A taper liner that is prevented from coming off, and a tie that is passed through a through hole provided in the axial direction of the taper liner and hung on the ends of the stator windings on both sides to tighten and secure the taper liner in the driving direction. Stator winding end fixing device with string.