JPH0223072Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotor of a rotating electric machine, and more particularly to a rotor coil end binding device.

Generally, in high-speed rotating machines such as turbine generators,
The rotor coil end of large models has a binding ring shrink-fitted to the outer diameter of the coil end to prevent damage due to centrifugal force.

In order to fix the binding ring in the axial direction and prevent eccentricity in the radial direction, an end ring has conventionally been attached to the end face of the coil.

This structure has the disadvantage that it significantly blocks the rotor's cooling ventilation circuit, making it difficult to cool the rotor of a high-speed machine, and that the structure is complicated, which increases the cost of the machine concerned.

SUMMARY OF THE INVENTION An object of the present invention is to provide a rotor for a rotating electric machine equipped with a rotor coil end restraining device that solves the drawbacks of conventional devices.

FIG. 1 is a side sectional view of a conventional device.

1 is the rotor core, 2 is the bonding ring, 3 is the insulation under the bonding ring, 4 is the coil end, 5 is the coil end support,
6 is an iron core clamp, 7 is a shaft rib, 8 is a rotating shaft, 9 is an end ring, 10 is an end ring air hole, 11 is an inner diameter part, 12 is an insulation, 13 is a duct piece, and 14 is a mounting bolt.

The binding ring 2 is fitted into the lower binding ring insulation 3, and as a fixing means thereof, an end ring 9 is attached to the shaft rib 7 via a bolt 14.

The insulation 3 under the binding ring is provided by wrapping a glass tape around the outer periphery of the coil end 4 and then impregnating it in epoxy resin.

In this structure, the ventilation opening area to the core and coil portion of the rotor is limited by the end ring air holes 10 and the inner diameter portion 11, and the rotor cannot be cooled sufficiently.

Furthermore, there are restrictions on the structure and dimensions due to the attachment of the end ring 9, making it difficult to adopt an optimal structure.

Furthermore, since the coil end 4 was also wrapped around it, effective ventilation was not possible, resulting in poor cooling performance.

FIG. 2 is a side sectional view of one embodiment of the present invention.

In a rotor of a rotating electrical machine, a rotor core 1 is laminated on a shaft rib 7 that is integrally formed with a rotating shaft 8.

The coil end 4 portion of the coil installed in the slot of the rotor core 1 is supported on the inner diameter side by the core clamp 6 and the coil end support 5 via the insulation 12, and the outer diameter side is bound and insulated under the ring. A bondage ring 2 is attached via 3.

Note that solid arrows indicate ventilation paths.

After wrapping a glass tape around the outer circumference of the coil end 4, a formwork is placed on the glass tape so that the outer circumferential surface of the coil end 4 can be fitted with the bonding ring 2 to which the bonding ring 2 is attached by creating an uneven surface on the mutual contact surface. After installation, epoxy resin is poured and impregnated, and the bondage ring under-insulation 3 is firmly molded integrally with the coil end 4. However, it is possible to create it as in the conventional case and then connect the outer peripheral surfaces to each other. It may be cut with a knife so that the unevenness of the surface can be fitted, that is, the outer diameter surface is molded to be smooth, but the outer diameter surface is appropriately roughened during this molding.

The inner diameter surface of the bondage ring 2 attached to this is also provided with unevenness corresponding to the unevenness of the lower bondage ring insulation 3, and the inner diameter of the bondage ring 2 is expanded to be larger than the outer diameter of the protrusion of the lower bondage ring insulation 3 by heating etc. and attach it.

By this means, the coil end 4 is firmly fixed, preventing damage to the coil end 4 due to centrifugal force during rotation, and preventing the binding ring 2 from moving in the axial direction or falling off due to vibration thermal expansion, etc., compared to the conventional method. A simple structure can be realized that cools the coil end 4 by ventilation and achieves a significant cooling effect.

3 and 4 are side sectional views of other embodiments of the present invention.

As shown in FIGS. 3 and 4, a bondage ring 2,
The bondage ring insulation 3 is divided into two or more pieces,
It is also possible to further increase the cooling effect.

Further, the corresponding uneven surfaces of the binding ring 2 and the insulation 3 under the binding ring may have various shapes as shown in FIG. 4.

Thus, according to the present invention, it is possible to obtain a rotor for a rotating electric machine including a rotor coil end restraining device which is particularly capable of greatly improving cooling, simplifying the structure, reducing costs, and improving reliability.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a conventional device, FIG. 2 is a side sectional view of one embodiment of the present invention, and FIGS. 3 and 4 are side sectional views of other embodiments of the present invention. 1... Rotor core, 2... Bonding ring, 3... Bonding ring bottom insulation, 4... Coil end, 5... Coil end support, 6... Iron core clamp, 7... Shaft rib, 8...
... Rotating shaft, 9 ... End ring, 10 ... End ring air hole, 11 ... Inner diameter part, 12 ... Insulation, 1
3...Duct piece, 14...Mounting bolt.

Claims (1)

[Claims for Utility Model Registration] A rotor of a rotating electric machine comprising a coil end binding device having a binding ring that is fitted and fixed to the coil end of a rotor coil through a lower insulation formed integrally with the coil end. , an engagement protrusion or a recess is provided on the outer periphery of the lower insulation, and an engagement corresponding to the engagement protrusion or recess of the lower insulation is provided on the inner periphery of a binding ring that fits with the outer periphery of the lower insulation. A rotor for a rotating electrical machine characterized by having a recess or a protrusion.