JPH048139A - Rotor coil of rotary electric machine - Google Patents

Abstract

PURPOSE:To facilitate the repair and the assembling of a coil performed on the site by providing plural axial slots at the periphery of a rotor iron core, and inserting one bar-shaped coil in each of these slots, and chaining the end of each coil by means of a plurality of connecting conductors extending in the circumferential direction and the radial direction. CONSTITUTION:A plurality of slots 20 extending in axial direction are provided around a rotor iron core, and one bar-shaped coil 21 is inserted in each slot 20. And the long coil ends 21A and 21a, 21B and 21b, and 21C and 21c are connected so that adjacent long coil ends may be chained in order by the U-shaped connecting conductors 22X, 22Y, and 22Z extending in the circumferen tial direction and besides in radial direction. In the same manner, short coil ends 21M and 21m are chained. If trouble occurs in the coil, the connections, for example, 21A and 21a of the coil of only the part which has caused trouble are removed, and next an insulation block, etc., required for disassembling are removed, and the repair of coil is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a rotor coil for a rotating electrical machine, and particularly to a rotor coil for a rotating electrical machine that is easy to manufacture and disassemble.

(Prior Art) Generally, in rotating electric machines, especially large-sized induction motors, wound type induction motors in which a rotor is provided with three-phase windings are often used. This induction motor is usually
It is constructed as shown in the figure, and the large capacity one has a large diameter and low speed. That is, a plurality of slots (not shown) extending in the axial direction of the rotor shaft 11 are provided on the outer periphery of the rotor core 10 of the induction motor. A rod-shaped or wire-shaped multilayer coil 12 is inserted into each slot, and each coil end portion thereof is connected by a connecting conductor 13 so as to form a chain connection or a wave connection. An insulator 14 is inserted between each of these coils 12 to prevent damage due to friction, and a glass tape is attached to the outer periphery of the coil end to prevent the coil 12 from flying out due to the centrifugal force of the rotor core 10. A bind wire 15 such as a metal wire or the like is wrapped around the wire.

Note that 16 is a cooling fan attached to an end plate 17 that supports the rotor core 10.

(Problem to be Solved by the Invention) When a coil accident occurs in such a rotating electric machine, the coil needs to be repaired or repaired. When the rotating electrical machine is small, the rotating electrical machine is removed from the installation site, transported to a repair or repair factory, and repaired or repaired. However, when a rotating electric machine becomes large, it cannot be easily repaired or transported from the installation site to a repair shop, so repairs and repairs are performed at the installation site.

For this repair, the rotor is removed from the rotating electric machine, all binding wires of the rotor are removed, and the coil that caused the accident is removed.

Since these repairs and repairs are carried out at the installation site, 1 usually unequipped machinery and jigs are transported to the site. Furthermore, since removing and installing the binding wire is laborious and troublesome work, there is a problem in that the rotating electric machine must be stopped for a long time.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, it is an object of the present invention to provide a rotor coil for a rotating electrical machine that facilitates repair and assembly of the coil on-site.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a plurality of slots extending in the axial direction on the outer periphery of the rotor core, and inserts one rod-shaped coil into each of the plurality of slots. The end portions of the wire are chain-wound connected by a plurality of connecting conductors extending in the circumferential direction and the radial direction.

(Function) If a coil of a rotating electrical machine causes an accident during operation, the rotating electrical machine is stopped in order to remove the coil that caused the accident. The rotor is removed from this stopped rotating electric machine. Next, the end of the coil that caused the accident was disconnected, and the rod-shaped coil was removed from the rotor core. This coil is repaired and repaired, and then inserted and connected to the slots of the rotor core.

Since these repairs and repairs simply involve separating and connecting the faulty coil, the work at the installation site can be done using simple equipment or jigs, which also shortens the length of the work and improves the operating rate of the rotating electric machine. be able to.

(Embodiment) An embodiment of the rotor winding of the rotating electrical machine of the present invention will be described below with reference to the accompanying drawings.

The structure of the rotor core is almost the same as the structure of the conventional rotor core explained in FIGS. 6 and 7, so the same parts will be described with the same reference numerals.

1 and 2 show a partial side view and a plan view of the rotor core 10. FIG.

A plurality of slots 20 extending in the axial direction are provided on the outer circumference of the rotor core 10, and one rod-shaped coil 21 extending in the axial direction is inserted into each slot 20. This coil 21 has a plurality of long coil end portions 21A, each set of three, extending in the axial direction via the end plate 17.
, 21B.

2IC, 21a, 21b121c and short coil end parts 21M, 21N, 21P, 21m, 21n, 21p, and these long coil end parts 21A and 21
8, 21B and 21b, 2IC and 21 (or U-shaped connecting rings 22X, 22Y extending in the circumferential direction and radial direction)
, 22Z, the long coil end portions closer to each other are successively connected in a chain-wound manner by a method such as silver brazing welding. Connect the long coil end parts like 2 to the upper coil. In the same way, connect the short coil end parts 21N1 and 21m121.
N and 21n, 2IP and 21p are U-shaped connecting conductor 23
Short coil end portions closer to each other by X, 23Y, and 23Z are connected in sequence in a chain winding manner. A coil having such a short coil end portion is called a lower coil.

Between each of these U-shaped connection rings 22X, 22y, and 22z are insulating blocks 24a, 24b (%24), and between each of the U-shaped connection conductors 23X, 23Y, and 23Z are insulating blocks 25m, 25n, 25 p is inserted.These U-shaped connecting rings 22X, 22y, 22z
An insulating layer 26 is inserted between the U-shaped connecting conductors 23X, 23Y, and 23Z, and the U-shaped connecting conductors 23X, 23Y, and
An insulating layer 27 is inserted between 23Z and the end plate 17, and these are integrally fixed with bolts 28a, 28b, and 28c (see FIG. 3).

The rotating electric machine configured in this manner rotates a load (not shown) in the usual manner. If a coil failure occurs due to overload or the like during operation of these rotating electric machines, it becomes necessary to repair or repair the coil.

In such a case, the rotating electric machine is stopped and the rotor core 10 is removed. From this removed rotor core 10, remove only the coil connections of the part where the failure occurred, for example, 21A and 21a,
Next, the insulating block 22X and the like necessary for disassembly are removed, and the coil is repaired and repaired.

Since the coils of this rotating electric machine only have one rod-shaped coil inserted into each slot, the distance between each coil can be increased, which improves corona discharge, flashover, and cooling performance, and improves the reliability of the rotating electric machine. You can increase your sexuality.

Furthermore, since the coil is rod-shaped, it is easy to assemble and disassemble into the rotor core, and there is no need for winding work.
The coil insulation will not be damaged during assembly work.

Therefore, compared to conventional repairs and repairs, this coil repair only requires disassembling and repairing the part where the failure occurred, making the repair work relatively easy in a short time and improving reliability. I can do it.

FIG. 4 shows the coil end portions 21A and 21 in FIG.
This figure shows another modified example in which the elements 24a, etc. are supported by insulating blocks 24a, etc.

That is, in FIG. 3, the insulation block 24a124
b, 24c, insulation blocks 25m, 25n.

25p1 insulation layer 26.27 and bolt 28a128b,
28c, insulating support rings 30a and 30b are attached to both ends of the insulating blocks 24a, 24b, 24c, the insulating blocks 25m, 25n, and 25p, and the insulating layers 26 and 27. The lid 31 is fixedly supported by bolts 32. Even in this manner, the rotor core 10 can be obtained with ease of disassembly and assembly as in the previous embodiment.

FIG. 5 shows another modification of FIG. 3, in which a support rod 3 for preventing deformation is installed inside the coil end portion, etc.
3, and is supported by a binding wire 34 to prevent the coil end portion etc. from deforming due to centrifugal force. When disassembling and repairing the rotor core 10 in the event of a coil accident, it is the same as in each of the above embodiments in that the part where the failure or repair has occurred is repaired.

〔Effect of the invention〕

In the rotor winding of the rotating electric machine of the present invention, one bar-shaped coil is inserted into each slot, and the coil end is connected to the chain winding by a connecting conductor extending in the circumferential direction and radial direction. If a problem occurs, it can be easily repaired by simply disassembling and reassembling the coil end.

Therefore, the rotor winding of a large rotating electric machine can be easily repaired and repaired on site.

[Brief explanation of drawings]

Figure 1 is a side view showing the main parts of the rotor winding of the rotating electric machine of the present invention, Figure 2 is a plan view of Figure 1, and Figures 3, 4 and 5 are the main parts of the coil end part. FIG. 6 is a perspective view showing the main parts of the rotor winding of a conventional rotating electric machine. FIG. 7 is a cross-sectional view showing the main parts of the coil end of the rotor winding of FIG. 6. It is a diagram. ]○...Rotor core, 11.Rotating shaft, 12.2]...
Coil, 13... Connection part, 14... Insulation part, 15.
34... Bind wire, 16. Cooling fan, 17. End plate, 20. Slot, 21A, 21B, 21C121a
, 21b, 21c...Long coil end, 21M, 2
1N, 21P, 21m, 2In, 21p...Short coil end, 22X, 22y, 22Z, 23X, 23Y
, 23Z...U-shaped connection conductor, 24a, 24b, 24
c, 25m, 25n, 2'3p-insulation block, 26
．． 27 Insulating layer, 28a, 28b, 28C, 32-volt, 30a, 30b-insulating support ring, 31...lid, 33-support rod. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] A plurality of slots extending in the axial direction are provided on the outer periphery of the rotor core, one rod-shaped coil is inserted into each of the plurality of slots, and the end portion of each coil is inserted into a plurality of slots extending in the circumferential and radial directions. A rotor coil for a rotating electric machine, characterized in that it is chain-wound connected by a connecting conductor.