JPS5980137A - Stator winding for rotary electric machine - Google Patents

Abstract

PURPOSE:To alleviate a stress due to thermal elongation difference by cooling a hollow stator winding connected to a jumper wire and a hollow stator winding not connected to the jumper wire with the same coolant. CONSTITUTION:A sub tube 2a and an orifice 13 are formed between a main tube 2 and a water feeder, and coolant from the feeder is flowed to the tube 2 through the tube 2a, a jumper wire 6 and the orifice 13 in parallel. The temperatures of the coolants supplied to hollow stator windings 3a, 3b become the same temperature, and a stator winding of a rotary electric machine which alleviates a stress due to the thermal elongation difference of the winding 3b connected to the jumper wire 6 can be obtained.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a stator winding of a rotating electrical machine, and in particular, a stator winding having a plurality of hollow stator windings that are directly cooled by cooling water and a cross wire. This relates to stator windings of rotating electrical machines.

[Prior art]

Generally, in rotating electric machines such as large-capacity turbine generators, a large current of 1000 OA or more is passed through the stator windings, so the stator windings are formed with so-called hollow stator windings in which cooling grooves are provided in each winding conductor. So-called direct cooling is employed in which the winding conductor is cooled by flowing a refrigerant such as water or oil into the cooling groove. In order to suppress vibrations caused by electromagnetic force caused by such a large current, the portion of the hollow stator winding that protrudes from the iron core is firmly fixed.

A conventional example of such direct cooling of stator windings is shown in FIG. As shown in the figure, the main main pipe 2 into which cooling water flows from the water supply device (not shown) through the cooling water port 1 is fixed hollow as shown by the solid arrow in the figure. The child winding 3a is connected to the insulated hose 4 and the water supply port 5,
Cooling water flows through the hollow stator winding 3b connected to the crossover wire 6 through an insulating hose 7 and the crossover wire 6, thereby cooling the hollow stator windings aa and ab, respectively. The cooling water that has cooled these hollow stator windings 3a and 3b enters the drain main pipe 10 from the drain port 8 via the drain side insulated hose 9, and is discharged from the drain main pipe 10 via the cooling water outlet 11. be done. In addition, in the figure, 12 is an output terminal.

By the way, the hollow stator winding 3b connected to the crossover wire 6 is cooled by the cooling water that has passed through the crossover wire 6, and the hollow stator winding 3b is cooled by the cooling water that is directly supplied from the main bus pipe 2 through the water supply port 5. There is a large difference in the temperature rise between the hollow stator winding 3a and the hollow stator winding 3b, which is connected to the crossover wire 6, which normally exists in at least nine locations in a three-phase AC turbine generator. The temperature rise was greater than that of the hollow stator winding 3a which was not connected to the other crossover wire 6. For this reason, a difference in so-called thermal elongation occurs between the hollow stator windings 3a and 3b due to thermal expansion, and since the protruding portion of the iron core is firmly fixed, the hollow stator windings 3a and 3b connected to the crossover wire 6, which has a large temperature rise, Stress due to the difference in thermal expansion is concentrated on the stator winding 3b, causing
There was concern that excessive force would be applied to the insulator and cause damage.

[Purpose of the invention]

The present invention has been developed in view of the above points, and its object is to provide a stator winding of a rotating electrical machine that reduces stress due to the difference in thermal expansion of the hollow stator winding connected to the wire. There are lines to provide.

[Summary of the invention]

That is, in the present invention, a sub-bus pipe and an orifice are provided between the main main pipe and the water supply device, and cooling water from the water supply device flows into the main main pipe through the sub-bus pipe, the crossing line, and the orifice in parallel. It is characterized by the fact that it is made to do so.

[Embodiments of the invention]

The present invention will be explained below based on the illustrated embodiments. FIG. 2 shows an embodiment of the 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, a sub-bus 2a and an orifice 13 are provided between the main bus 2 and a water supply device (not shown), and cooling water from the water supply device connects the sub-bus 2a, the crossover wire 6, and the orifice 13 in parallel. It was made to flow into the mother tube 2 through the tube. By doing this, the temperature of the cooling water supplied to the hollow fixed prewinding M3a, 3b is kept at the same temperature, and the stress due to the difference in thermal expansion of the hollow stator winding 3b connected to the wire 6 is reduced. It is possible to obtain a stator winding for a rotating electrical machine with reduced stress.

That is, a sub-main pipe 2a and an orifice 13 are provided between the main main pipe 2 and the water supply device, and the cooling water from the water supply device is routed from the sub-main pipe 2a to the insulated hose 14 as shown by the solid arrow in the figure. After passing through the crossover wire 6, it flows into the main main pipe 2 via the insulating hose 15. Further, in parallel with this, cooling water from a water supply device is made to flow into the main main pipe 2 via an orifice 13.

Therefore, the cooling water flowing through these lines 6 and the cooling water passing through the orifice 13 are mixed in the raw mother tube 2, and the hollow stator winding 3a is heated to the same temperature.

3b is supplied via insulating hoses 4 and 7, the temperature rise of the hollow stator winding 3b connected to the wire 6 is reduced by the temperature rise of the hollow stator winding 3b connected to the other wire 6. The temperature rise can be made equal to the temperature rise of the child winding 3a, and the stress due to the difference in thermal expansion of the hollow fixed pre-winding g3b connected to the cross wire 6 can be reduced.

Incidentally, if 120 stator windings are used (in the case of 60 slots), the Wataru wire 6 is connected to 9 of them (three-phase line side, neutral point side, line side and neutral point side). There are three types of cross wires 6 for each phase, so in the case of three phases, there are nine wires).

Therefore, the temperature increase of m6 across these nine lines is
The temperature rise of the nine hollow stator windings 3b connected to the wire was made higher than the temperature rise of the other 111 hollow stator windings 3a, but as mentioned above, the temperature of this wire 6 In other words, by cooling these 120 stator windings with the cooling water that has cooled the wire 6 in advance, the temperature rise of these 9 hollow stator windings 3b is reduced. The temperature rise of the 111 hollow stator windings 3a that are not connected to the crossover wire 6 is the same, and even if the protruding portion of the iron core is firmly fixed, the stress due to the difference in thermal expansion is reduced, and the electromagnetic It can be made to be able to withstand force.

〔Effect of the invention〕

As described above, in the present invention, the hollow stator winding connected to the crossing wire and the hollow stator winding not connected to the crossing wire are cooled with cooling water of the same temperature. This makes it possible to make the temperature rise of the hollow stator winding connected to the crossover wire the same as the temperature rise of the hollow stator winding not connected to the crossover wire,
It is possible to obtain a stator winding for a rotating electrical machine in which stress due to the difference in thermal expansion of the hollow stator winding connected to the wafer wire is reduced.

[Brief explanation of the drawing]

FIG. 1 is a cooling system diagram showing cooling of a stator winding of a conventional rotating electrical machine, and FIG. 2 is a cooling system diagram showing cooling of an embodiment of the stator winding of a rotating electrical machine of the present invention. 2... Main bus pipe, 2a... Sub bus pipe, 3a... Hollow stator winding (connected to the crossing line), 3b... Hollow stator winding (connected to the crossing line) ), 6... Wataru Shi line, 1
．． 3 orifice chair.

Claims (1)

[Claims] 1o A plurality of hollow stator windings, a crossover wire connecting each of the hollow stator windings or the hollow stator winding and the output terminal, and a water supply device connecting the hollow stator windings to the hollow stator windings. In a stator winding of a rotating electric machine, the stator winding of a rotating electric machine is provided with a main bus through which cooling water flows, and the hollow stator winding is directly cooled, and a sub bus and an orifice are provided between the main bus and the water supply device. A stator winding of a rotating electrical machine, characterized in that the cooling water from the water supply device flows into the main main pipe through the sub-bus pipe, the transverse wire, and the orifice in parallel. .