KR830001027Y1 - Phase lead connecting the stator coils and the parallel phase ring - Google Patents

Abstract

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Description

Phase lead connecting the stator coils and the parallel phase ring

1 is a cross-sectional view of a turbine generator.

FIG. 2 is a partial cross sectional view of a portion of the turbine generator of FIG. 1 rotated 90 ° to show phase leads interconnecting them in parallel phase rings and the relative positions of the stator coil terminations. FIG.

3A is a front view of the main body of a phase lead electrically interconnected with a stator coil header and a parallel phase header.

FIG. 3b is a view rotated 90 ° with the right side of FIG. 3a facing up.

4A and 4B are front views of respective stator coil headers of FIGS. 3A and 3B.

5A and 5B are front views of respective phase lead components connected to the stator coil headers of FIGS. 4A and 4B, respectively.

6A and 6B are front views of each of the phase lead components shown in FIGS. 5A and 5B and the second phase lead components respectively connecting one end thereof.

7A and 7B are front views of respective parallel phase ring headers fixed to the second phase lead components shown in FIGS. 6A and 6B, respectively.

The present invention relates to an internal cooling winding and a parallel phase ring of a power generation motor, and more particularly, to an apparatus for electrically connecting a stator coil to a parallel phase lead ring.

Increasing efficiency and saving scale have required a constant increase in turbine generator ratings. This increase in rating also required maintenance of the machine and reduction in actual size. The use of liquid cooling in the stator coils of turbine generators has also become necessary to achieve this special purpose.

The phase ring, which is electrically connected to the outer bushing of the machine, was cooled by the cooling gas.

However, the increased size and limitations of fixed-gap machines necessitated liquid cooling of the parallel phase ring.

The phase lead electrically connects between the parallel phase ring and the end of the stator coil. In the past, flexible phase leads were used to compensate for misalignment between the phase lead connection point of the parallel phase ring and the stator coils. However, it has been found that the flexible phase lead has a natural frequency below fill.

Such natural frequencies can weaken the phase lead against excessive vibration and force. Short, rigid phase leads have a relatively high natural frequency and have been considered unable to control the misalignment between parallel phase rings and stator coils. The problem of the proper sealing of the coolant flowing through the phase lead has brought another barrier to the liquid cooling of the waste lead. The sealing of such coolant was not of great importance before, because the gas coolant that previously cooled the phase lead did not harm or contaminate the interior of the generator. Liquid cooling of solid phase leads was required to control the misalignment between these parallel phase rings and stator coils, but at the same time it was believed to be a difficult goal to achieve.

According to the present invention, the generator is a stator iron core; A plurality of stator winding coils cooperably associated with the stator cores, constituting a stator winding having two end portions of each coil, and having an internal passageway for the coolant; A plurality of parallel phase rings disposed at least at one end of the stator shaft and having an internal passageway for the coolant; A plurality of coil headers connected to the coil terminal portion so that the coolant flows through the inner passages of the coils, each of which includes a contact portion having an opening therein; A plurality of phase ring headers connected to corresponding phase rings so that the coolant flows through the internal passages of the parallel phase ring, and each of which includes a phase lead fastener having at least one opening therein; A plurality of phase leads for electrically connecting the coil header and the phase ring header, each phase lead having a first component having a configuration and at least one hole therein, and a cylindrical portion and at least one hole therein. A plurality of bolts that can be inserted into a series of holes to secure the second component and phase lead to the phase ring header and coil header; The first part has a coil header when the holes of the first part are in series with the slots of the corresponding pair of coil headers such that at least one of the first pair of openings forms the first pair of openings forming the slots extending in the first direction. And a second part can be mated with one phase ring header, the hole of the second part being a slot in which at least one of the second pair of openings extends in a second direction perpendicular to the first direction. It may be in series with the slot of the pair of phase ring header of the pair to form a second pair of openings constituting the opening, the cylindrical portion is characterized in that it is insertable into the opening in a direction perpendicular to the first and second directions .

Conveniently, the coil header, phase ring header and phase lead portions have openings for fitting the fasteners. Each phase lead is an opening that is generally aligned with the openings of the connected coils and the phase ring headers at the two components and their distal ends, such that their adjacent ends are rotatable, creating openings of the first and second series, respectively. Have them. At least one of each straight pair digs a slot into a coil header series opening extending in a direction perpendicular to the axis of rotation of the phase lead component and a slot in the parallel phase ring header is perpendicular to the direction of rotation of the phase lead component and the coil header. The slot of the stretches in the extending direction. The phase leads mate along a surface perpendicular to the longitudinal axis of each header and the linear opening therein.

In an embodiment of the present invention, it is preferable to use solder or other metal adhesive on the surface of the header and the surface of the phase lead to mate with it. Such metal bonding ensures an optimal electrical connection therebetween.

The mating holes are larger than the fasteners fitted therein, allowing the phase lead portion to rotate relative to the coil and parallel phase ring headers connected thereto. The vertically arranged slots and the relatively rotating phase leads allow for three-way free translation and free rotation motions to adjust and correct the misalignment between the stator coils and the parallel phase ring.

The two phase lead components are robust to ensure natural vibration and are relatively short to facilitate thermal conduction to the coolant circulating through the coil and phase ring headers past this end.

Phase-lead mating parts rotatably mated have a hole in the first part and a cylindrical part in the second part, so that the cylindrical part is properly shaped to match the actual separated length between the coil and the parallel phase ring during assembly. To be inserted into the opening.

The present invention will be described by way of example with reference to the accompanying drawings.

The present invention mainly relates to the phase lead used in the winding of an electric machine. Therefore, the following description shows the present invention as an example of a large liquid-cooled turbine generator. However, it should be understood that the present invention can be used in any power generation machine.

FIG. 1 shows a generator 10 having an enclosure 12 surrounding a stacked stator core 14 of conventional construction supported in an enclosure 12 in a suitable manner. The stator core 14 is provided with a longitudinal slot 16 in a conventional manner, for example, to receive the stator winding coil 18. The stator winding coil 18 is composed of a hollow conductor 20 having an inner passage open to the coil header 22 through which the coolant flows through the liquid cooling inner passage. Although omitted for clarity in most of the illustrated stator winding coils 18 as coil headers 22, these headers preferably collect the coolant from the hollow conductors 20 and for the stator winding coils to be liquid cooled. It can be seen that 20 is connected to the ends of all stator winding coils to distribute the coolant. A multi-pipe (not shown in FIG. 1) for supplying and discharging the coolant is fluidly connected to the coil header 22 through a header nipple 24. The rotor 26 is placed inside the stator core 14, and the field windings are distributed in a suitable form.

The stator winding coil 18 of the generator contains a suitable number of half coils or coil edges, which are typically placed in their respective slots 16 and connected to the ends of most of the coils to form a complete generator winding. . The illustrated stator winding 18 has a three phase group coil that supplies one phase of a three phase electrical supply. Each phase group includes, for example, two phase tiers (zones) connected by parallel phase rings 28, 30 and 32. The semicoils of all stators except the semicoils, which constitute the six-phase end of the terminal, are serially connected to each other by conventional winding-to-serial connectors between the appropriate upper and lower ends of the half coils at the ends on both the front and rear sides of the machine. Leads to.

Main leads 34 ', 36', 38 ', 40', 42 'and 44 connected to parallel phase rings 34, 36, 38, 40, 42 and 44, respectively. Is connected to the outer bushings 46, 48, 50, 52, 54 and 56 through the enclosure 12. Each phase lead 58 extends axially from the normal parallel phase ring to the coil terminal portion of the six phase tiers.

Specifically, the phase lead 58 is electrically connected between the coil header 22 of the appropriate terminal coil portion and the parallel phase ring header 60.

FIG. 2 shows a partial cross section of the typical phase leading ring taken in FIG. 1 and also connected to the typical coil termination taken in FIG. The remaining phase lead rings and their connection have been omitted for clarity. Thus, the parallel phase ring header 60 of the parallel phase ring 34 is electrically connected to the coil header 22 of the terminal portion of the stator winding coil 18. The coolant manifold 62 supplies the coolant to the coil header nipple 24 through the connecting pipe 64. The parallel phase ring header 60 receives the coolant through a nipple 66 fluidly connected to the coolant manifold 62 shown for purposes of the present invention, or through a source of other coolant.

3A and 3B are front and side views of a coil header 22 of a typical coil terminal, a parallel phase ring header 60, and an interconnecting phase lead 58. FIG. The coil header 22 has an electrical phase lead contact 68 and a coolant chamber 70. The coolant supplied to the header nipple 24 enters the coolant chamber 70 through the opening 72 formed in the contact portion 68.

Similarly, the header 60 of the parallel raising ring 34 is comprised of a phase lead fastener 74 and a fluid transfer part 76.

Coolant supplied to the nipple 66 passes through the opening 78 in the fluid delivery portion 76 and enters the internal cooling parallel phase ring 34. The phase lead 58 is a material for electrically connecting the contact portion 68 to the second component 82 which in turn electrically connects the first component 80 to the fastening portion 74 of the parallel phase ring header 60. One component 80 is included.

The coil header 22, better shown in FIGS. 4a and 4b, has a bolt 84 and nut connecting to the first component 80, which is a phase lead coil component better shown in FIGS. 5a and 5b. Good adhesion is made by (86). The spring washer 88 and the flat washer 90 of the example lie between the nut 86 and the contact 68.

The bolt 84 is received as a slot 92 and a hole 94 in each of the contact portion 68 and the first component 80, which is a phase lead component. The first component 80 has a narrow spacing of relationship between having the opening 96 at one end of the first component 80 enclosed together to rotatably mate with the cylindrical portion 98 of the second component 82. The second component 82 has a hole 100 generally in line with the slot 102 formed in the phase lead fastener 74. Bolts 84 are generally received in straight slots 102 and holes 100 and filled by nuts 86. A round opening 106 formed at one end of the parallel phase ring header 60 surrounds the cylindrical phase ring portion 108. Slot 92 and slot 102 extend in a direction perpendicular to each other and are sufficiently large in a direction that is not in the extended direction such that phase lead 58 rotates slightly for any of its connected headers. The hole 96 and mating cylindrical portion 98 can be rotated relatively around the longitudinal axis of the hole 96 during assembly.

Portions a shown in dashed lines in FIGS. 3A, 3B, 6A and 6B are appropriate lengths to adjust the overall length of the phase lead 58 to the actual separation between the coil and the phase ring connecting during assembly. Cut up to. The longitudinal axis of the hole 96 was formed in the vertical direction of the direction in which the slot 92 and the slot 102 extend.

After assembly, the first and second parts 80 and 82, which are phase lead parts, are preferably soldered together to rotatably mate with mating contacts to ensure optimum electrical contact and mechanically sufficient adhesion. The first and second parts 80 and 82, which are phase lead parts, have a flat surface that mates with an outer surface of the contact portion 68 and the tightening portion 74 on the parallel phase ring feather 60. FIG. It is good practice to solder to ensure sufficient electrical contact between the mating surfaces. The opening 110 of the second component 82 may be provided to reduce the weight of the phase lead. The presence, size, and location of the opening 110 are mainly determined by the natural frequency mechanical stress problem.

Various rotations and variations of the phase leads 58 ensure optimum electrical contact and mechanical coupling with the coil and phase leading headers 22 and 60, respectively. Given freedom of translation in three directions and rotation in three directions, virtually all proper misalignment between headers 22 and 60 can be solved. In addition, the phase lead 58 is made as short and rigid as possible to ensure a relatively high natural frequency.

The use of such short phase leads eliminates the need for internal cooling, because their ends are sufficiently thermally in contact with the header of the coolant to sufficiently fill the phase lead 58 by thermal conduction of the coolant passing through it through the ends. It is because it cools.

It has become clear that with a relatively high natural frequency, no internal cooling is required, and an improved phase lead has been provided to control the relatively large misalignment between the connecting coil and the phase ring header.

Claims (1)

Composed of stator iron core 14, multiple stator winding coils 18, multiple parallel phase rings 34, multiple coil headers 22, multiple phase ring headers 60 and multiple phase leads 58 In the generator, each phase lead 58 includes a first part 80 having a hole 96 and a hole 94 and a second part 82 having a cylindrical portion 98 and a hole 100; A stator coil having a plurality of bolts 84 for securing a phase lead to a phase ring header and a coil header, the cylindrical portion 98 being inserted into the hole 96 in a direction perpendicular to the first and second directions. Phase lead to connect a parallel phase ring.