JP2000350396A - Winding method of dynamo-electric machine and dynamo- electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a winding method of a dynamo-electric machine, by which voltage unbalance among the three winding circuits of each phase can be reduced while potential difference with the coil of adjacent another phase on the lead wire side can be suppressed to a low value. SOLUTION: Four poles are constituted of the three first or third winding circuits of each phase as follows: A P1 pole: six upper coils and bottom coils for the first winding circuit 131, a P2 pole: six upper coils and bottom coils for the second winding circuit 132, a P3 pole and a P4 pole: four upper coils and bottom coils for the third winding circuit 133, and coils excepting coils adjacent to the coils of other phase in the lead wire side (the collector ring side) in six upper coils and bottom coils configuring the four poles are connected to crossover tracks.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-phase star-connected armature winding in which three winding circuits are connected in parallel for each phase. Two
The present invention relates to a winding method and a rotating electric machine for a three-phase four-pole rotating electric machine that is layer-wound.

[0002]

2. Description of the Related Art A stator core of a rotating electric machine is composed of a multi-layered thin plate, and a plurality of slots are provided on an inner peripheral side of the stator for winding armature windings. In the generator, the armature winding is usually a short winding of distributed winding in order to make the induced voltage waveform a sine wave. The reason for this is that if the ratio between the winding pitch and the magnetic pole pitch is β, for a three-phase machine, β = 5/6
This is to reduce the fifth and seventh harmonics.

[0003] In the case of a turbine generator, a two-pole machine is mostly used for thermal power, but a four-pole machine is widely used for nuclear power. Generally, the armature winding of a turbine generator is a Y (star) connection, and the number of parallel circuits of each phase winding circuit is a divisor of the number of poles. For example, in the case of a four-pole machine, if the number of winding circuits in each phase is set to 4 or 2, the winding circuits can be electrically arranged exactly the same, and the induced voltage between the winding circuits Can be balanced.

When increasing the capacity of the generator, the power factor is almost the same, so that it is necessary to increase the product of the voltage and current of the generator. In small capacity machines, coils of each phase are connected in series to obtain high voltage, but in large capacity machines it is common to use four or two parallel winding circuits due to problems such as insulation.

[0005] By the way, if the winding circuit of each phase is a three-parallel circuit, the structure of the generator can be rationalized more than a four-parallel circuit. This is described in, for example, JP-A-9-205750.

The reason why the structure of the generator can be rationalized by using three parallel winding circuits for each phase will be described with reference to FIGS. 5 and 6. FIG. FIG. 5 is a conceptual diagram of a 4-parallel circuit and Y connection, and FIG. 6 is a conceptual diagram of a 3-parallel circuit and Y connection.

As shown in FIG. 5, if each phase winding of the armature winding of the turbine generator 143 is a four parallel circuit, the lead wire 7
3 to 78 are 6 each on the turbine side and collector side, totaling 12
As a book, the bushing 145 and the terminal box 144 are also arranged on both sides. In FIG. 5,
As shown in FIG. 5B, an example is shown in which each phase winding has two parallel circuits.

On the other hand, if each phase winding is formed in a three-parallel circuit, as shown in FIG. 6, there are six leads 73 to 78, and the bushing 145 and the terminal box 144 need only be arranged on one side of the collector ring. Will be done.

As described above, when the winding circuit of each phase is formed as a three-parallel circuit, it is effective in streamlining the structure of the generator and securing space under the generator. However, since the number of parallel circuits of the winding circuits of each phase is not a divisor of the number of poles, the induced voltage of each winding circuit becomes unbalanced, and a circulating current flows between the winding circuits. Therefore, when the winding circuit of each phase is a three-parallel circuit in a four-pole machine, it is necessary to reduce the voltage imbalance between the winding circuits.

In order to reduce the voltage imbalance between the winding circuits, Japanese Patent Application Laid-Open No. 9-205750 discloses the following coil arrangement. FIG. 7 shows an arrangement of coils described in Japanese Patent Application Laid-Open No. 9-205750, and FIG. 8 shows a cross section of an armature winding. In FIG. 7, numerals 1 to 72 in a square frame indicate slot numbers, and numerals 1 to 72 are 1
2, 3, ..., 71, 72, 1, ... in the circumferential direction in this order.

The coils 125 and 126 of the armature winding are stator iron cores.
It is housed in a slot 127 provided in 124 and has a wedge 12
Fixed at 8. As shown in FIG.
5 and 126 are two layers, the inner diameter of the stator (wedge 128)
The coil 125 on the side is referred to as an upper coil, and the coil 126 on the outer diameter side of the stator is referred to as a bottom coil. For a three-phase, four-pole, 72-slot generator, the number of slots Nspp for each pole and phase is Nspp = (number of slots) /
(Number of phases × number of poles) = 72 / (3 × 4) = 6.

On the other hand, as described above, since it is desirable that the induced voltage waveform of the generator is as close as possible to a sine waveform, the ratio β between the winding pitch and the magnetic pole pitch is usually set to β = 5/6. In the case of 72 slots, since the magnetic pole pitch is (number of slots) / (number of poles) = 72/4 = 18, the winding pitch τ is 15 (for example, τ = 32−17 = 15 as shown in FIG. 7). ). Therefore, one phase (for example, U phase)
The P1 pole is composed of the upper coil of 2, 1, 2, 3, and 4 and the bottom coil of slots 14 to 19, and the upper coil and slot of slots 17 to 22
The bottom coil of 32 to 37 constitutes P2 pole, the top coil of slot 35 to 40 and the bottom coil of slot 50 to 55 constitute P3 pole, and the top coil of slot 53 to 58 and slot 68 to 72,1 The P4 pole will be composed of the bottom coil.

The number of the upper and lower coils constituting the three winding circuits of each phase is (the number of slots) / (the number of phases × the number of parallel circuits) = 72.
/ (3 × 3) = 8, that is, each of the three winding circuits 131 to 133 includes eight upper coils and eight bottom coils.

The four poles (P1, P2, P3, P4) are constituted as follows by the three winding circuits 131 to 133, respectively.

P1 pole: 6 upper and lower coils of the winding circuit 132 P2 pole: 6 upper and lower coils of the winding circuit 133 P3 pole: 4 upper coils and the bottom of the winding circuit 131 Coil and winding circuits located second and fourth from the winding axis of the pole
133 upper and lower coils of P4 pole: Four upper and lower coils of the winding circuit 131, and second and fourth winding circuits from the winding axis of the pole
132 upper coil and bottom coil 72 slots, electrical angle of one slot pitch in a 4-pole machine is (number of slots / number of pole pairs) = 360 ° / (72/2) = 10 °. When the induced voltage is V ₁ ∠0 °, the induced voltage of the slot 2 is V ₁ ∠10 °, the induced voltage of the slot 3 is V ₁ ∠20 °,
.., The induced voltage in the slot n becomes V ₁ ∠ [(n-1) × 10] °.

The induced voltages of the three winding circuits 131 to 133 are vector sums of the induced voltages of the upper coil and the bottom coil constituting each of the winding circuits 131 to 133. As shown in FIG. 131 is composed of eight upper coils in slots 35, 36, 38, 40, 53, 54, 56, 58 and eight bottom coils in slots 50, 52, 54, 55, 68, 70, 72, 1. The line circuit 132 has slots 71, 72,
8 upper coils and slots 14 to 19, 69, 71 for 1-4, 55, 57
And the winding circuit 133 has slots 17 to 2
If the upper coils 2, 37 and 39 are composed of eight upper coils and the slots 32 to 37, 51 and 53 are composed of eight lower coils, the induced voltages of the winding circuits 132 and 133 are equal, and the induced voltage of the winding circuit 131 is 0.15. Although it is smaller than the winding circuits 132 and 133 by about%, three winding circuits
Voltage imbalance of 131 to 133 can be reduced.

Note that the induced voltage of the winding circuit 131 is
The reason why the induced voltage is smaller than the induced voltages of 32 and 133 is that the coil arrangement constituting the winding circuit 131 is different from the winding circuits 132 and 133 and the voltage phase of the coil is different. 0.15%
Is a value calculated by the present inventors.

As can be understood from FIG. 7, when three winding circuits are connected in parallel, the winding pitch on the lead wire side (collector ring side) or on the side opposite to the lead wire (turbine side) is constant. For example, Japanese Patent Publication No. 54-668
As described in Japanese Unexamined Patent Publication No. 3 (1993), the upper coil 125 and the bottom coil 126 are connected by changing the winding pitch of a specific coil.

[0019]

In the prior art, the voltage imbalance between the three winding circuits is reduced, but on the collector ring side (lead wire side), all four poles are sixth from the winding axis, ie, The outermost top coil and bottom coil are connected to the crossover. Therefore, on the collector ring side, the potential difference between adjacent adjacent coils having a different phase of 120 degrees becomes larger. Considering that the rated voltage of the generator is limited also from the viewpoint of the withstand voltage of the insulation used for the armature winding coil, it is required to minimize the potential difference of the interphase coil.

An object of the present invention is to reduce the voltage imbalance between the three winding circuits of each phase and to reduce the potential difference between adjacent coils of the other phase on the collector ring side. A wire method and a rotating electric machine are provided.

[0021]

A feature of the present invention is that four poles are constituted by three first to third winding circuits of each phase as follows, and P1 pole: first winding circuit. 6 top and bottom coils of P2 pole: 6 top and bottom coils of the second winding circuit P3 pole: 4 top and bottom coils of the 3rd winding circuit and from the winding axis of the pole P4 pole: two upper coils and bottom coils of the first winding circuit located second and fourth, and four upper coils and bottom coils of the third winding circuit, and second and fourth coils from the winding axes of the poles The two upper coils and the bottom coil of the second winding circuit located secondly are adjacent to the other phase coil on the lead wire side (collectoring side) of the six upper coils and the bottom coil constituting the four poles The reason is that a coil other than the coil is connected to the crossover.

That is, the upper coil and the bottom coil connected to the crossover on the collector ring side are the second to fifth coils from the winding axis.
That is the third coil.

According to the present invention, the voltage imbalance between the three winding circuits of each phase can be reduced, and the potential difference between the adjacent coils of the other phases can be suppressed.

[0024]

Embodiments of the present invention will be described below in detail with reference to the drawings.

In order to facilitate understanding of the present invention, a description will be made in comparison with an example described in Japanese Patent Application Laid-Open No. 9-205750, which is a prior art.

FIG. 1 shows an armature winding connection diagram showing one embodiment of the present invention for one phase, and FIG. 2 shows three phases thereof.
FIG. 3 shows the conventional connection diagram for one phase, and FIG. 4 shows the three phases.

Here, in FIGS. 1 to 4, 1 to 72 indicate slot numbers, and in order from 1, 2, 3,.
1, 72, 1, .... Also, the solid line is described as an upper coil, and the dotted line as a bottom coil. However, it goes without saying that the dotted line may be the upper coil and the solid line may be the bottom coil.

First, a conventional connection will be described with reference to FIGS.
This will be described with reference to FIG.

FIG. 3 shows one phase (for example, U phase) of the conventional connection diagram.
FIG. 4 is a diagram showing the connection of FIG.
The phase connections are similar to the U-phase connections (Figure 3) at 120 ° and 240 ° spatially.
It is just staggered. Hereinafter, the U-phase winding circuits 131, 132, and 133 will be described with reference to FIG.

As described with reference to FIG.
1 is the upper coil of the slots 35, 36, 38, and 40 constituting the P3 pole and the bottom coil of the slots 50, 52, 54 and 55, and the upper coil of the slots 53, 54, 56 and 58 constituting the P4 pole. slot
It is configured by connecting 68, 70, 72, 1 bottom coils in series. The winding circuit 132 includes slots 71, 72, 1 to
4 and the bottom coil of slots 14 to 19, the top coil of slots 55 and 57 constituting the P4 pole and the bottom coil of slots 69 and 71 are connected in series.
Upper coil of slots 17 to 22 and slot 32 that constitute 2 poles
37, the upper coils of slots 37 and 39 constituting the P3 pole and the bottom coils of slots 51 and 53 are connected in series.

With such a coil arrangement, the voltage imbalance between the three winding circuits 131, 132 and 133 is 0.15% (the induced voltages of the winding circuits 132 and 133 are equal, and the winding circuit 131
Is 0.15 from the induced voltage of the winding circuits 132 and 133.
%), And the voltage imbalance can be minimized when the number of stator slots is 72 and the ratio of the magnetic pole pitch to the winding pitch τ = 5/6.

Except for a predetermined coil, the winding pitch is 14 on the lead wires 73 and 74 (collector side) and 15 on the side opposite to the lead wires (crossover 85 to 90) (turbine side). ing. Connections with a winding pitch different from the usual fixed winding pitch exist only on the turbine side, and there are 18 locations for three phases (for example, the connection between the upper coil of the slot 37 and the bottom coil of the slot 53).

The difference between the connection at a fixed winding pitch and the connection at another pitch is shown in FIG.
9 FIG. 9 shows the connection between the upper coil and the bottom coil of the P4 pole shown in FIG. 3 on the turbine side, and the connection of the upper coil and the connection of the bottom coil are indicated by dotted lines. As shown in FIG. 3, the upper coils of the slots 53 and 57 and the bottom coils of the slots 68 and 69 are connected to the crossover.

The connection between the upper coil of the slot 58 and the bottom coil of the slot 1 has a constant winding pitch.
At the coil end connecting the upper coil and the bottom coil of slot 1, the circumferential position is the same. On the other hand, for example, the upper coil of the slot 54 is not connected to the bottom coil of the slot 69, but is connected to the slot 70 with a fixed winding pitch and a different winding pitch. At the coil ends, the positions in the circumferential direction are different and the coils are connected diagonally. Therefore, as the number of locations to be connected at winding pitches other than a fixed winding pitch increases, the end structure becomes more complicated and the cost increases.

There are nine crossovers (crossovers 79 to 84 and 103 to 105) on the lead wires 73 to 78 (collector ring side), and the overlap is 7 rings (crossovers 103 to 105) when viewed in the axial direction. The same ring).

On the other hand, on the turbine side, there are 18 crossovers (crossovers 85 to 102), and when viewed in the axial direction, the overlap is 6 rings.
(Crossovers 85, 87 and 89 are the same ring, crossovers 86, 88 and 90 are the same ring, crossovers 97, 99 and 101 are the same ring, crossover 9
8, 100 and 102 are the same ring, crossovers 91, 93 and 95 are the same ring, and crossovers 92, 94 and 96 are the same ring).

As described above, in the conventional connection, the voltage imbalance between the three winding circuits can be reduced to about 0.15%.
At this point, the crossovers seen in the axial direction have a total of 13 rings.

Next, the problem will be specifically described.

In FIG. 4, when the lead wires 74, 76, 78 are on the neutral point side of the star connection, the lead wires 73, 75, 77 are on the output terminal side. Therefore, the winding circuit 133 is
Upper coil of slot 17 from connection point 111 to slot 32
Bottom coil, slot 18 top coil, slot 33 bottom coil, slot 19 top coil, slot 34 bottom coil,
Top coil of slot 20, crossover 89, top coil of slot 39, bottom coil of slot 53, top coil of slot 37, bottom coil of slot 51, crossover 90, bottom coil of slot 35, top coil of slot 21, Bottom coil of slot 36, top coil of slot 22, bottom coil of slot 37, crossover 79
To the connection point 108.

On the other hand, a winding circuit 130 having a phase different from that of the winding circuit 133 is connected to the bottom coil of the slot 43, the upper coil of the slot 28, the lower coil of the slot 42, Coil, bottom coil of slot 41, slot
26 top coil, slot 40 bottom coil, slot 25 top coil, slot 39 bottom coil, slot 24 top coil, slot 38 bottom coil, crossover 93, slot 21 bottom coil, slot 7 top coil , The bottom coil of the slot 23, the upper coil of the slot 9, the crossover 94, the upper coil of the slot 23, and the connection point 113 with the crossover 81.

By connecting in this order, the winding circuit 13
In 3, the potential of the connection point 111 is zero, and the closer to the connection point 108 in the connection order, the higher the potential. The winding circuit 130 has the potential of the connection point 116 of zero, and the potential of the connection point 113 in the connection order is zero. The closer the potential, the higher the potential. Therefore, on the lead wires 73 to 78, the potential difference between the upper coil (the winding circuit 130) of the slot 23 and the upper coil (the winding circuit 133) of the slot 22 increases. This potential difference is about 92.6% of the terminal voltage V as calculated by the present inventors.

As described above, the potential difference between the coils of different phases becomes larger because the coils closer to the lead wires 73, 75, and 77 in the connection order have a higher potential, and constitute one pole.
Out of the six upper coils and the bottom coil, the outermost or innermost coil as viewed from the winding axis is caused by two adjacent coils of different phases.

Therefore, the lead wires 73 and 7 are viewed in the connection order.
If the coils close to 5,77 are the 2nd to 5th coils counted from the winding axis, out of the 6 upper and lower coils that make up one pole, the potential difference between adjacent out-of-phase coils can be reduced. can do.

The present invention has been made based on such knowledge, and as shown in FIG. 1, the upper coil and the bottom coil are connected to reduce the potential difference between adjacent coils between different phases.

In FIG. 1, the upper coil and the bottom coil constituting each winding circuit 131, 132, 133 are the same as the conventional connection shown in FIG. 3, and the voltage imbalance between the winding circuits 131, 132, 133 is 0.15. %.

On the other hand, in FIG. 3, except for a predetermined coil, the winding pitch is set to 1 on the collector side (lead wires 73 to 78 side).
4. On the turbine side (crossover 85-102 side), it is set to 15. On the other hand, in the present invention shown in FIG.
Winding pitch on the collector ring side (lead wire 73-78 side)
15, 14 on the turbine side (crossover 85-102 side). By doing so, the second to fifth coils counted from the winding axis can be connected to the connecting wire 79 without increasing the number of connecting wires.
~ 84 can be connected.

This will be specifically described.

The winding circuit 131 is connected to the upper coil of the slot 38, the lower coil of the slot 52, the upper coil of the slot 36, the lower coil of the slot 50,
Top coil, crossover 85, top coil of slot 53, bottom coil of slot 68, top coil of slot 54, bottom coil of slot 70, top coil of slot 56, bottom coil of slot 72, top coil of slot 58, The bottom coil of the slot 1, the connecting wire 86, the bottom coil of the slot 55, the upper coil of the slot 40, the bottom coil of the slot 54, and the connection point 106 with the connecting wire 79 are connected in this order.

When the connection is made in this manner, there are three places to be connected at a specific winding pitch other than a fixed winding pitch (the lead wire side: the bottom coil of the slot 52, the upper coil of the slot 36,
Connection between the upper coil of the slot 54 and the bottom coil of the slot 70 and the upper coil of the slot 56 and the bottom coil of the slot 72).

The winding circuit 132 includes a bottom coil of the slot 69, a top coil of the slot 55, a bottom coil of the slot 71, a bottom coil of the crossover 87, a bottom coil of the slot 19, from the connection point 110 with the crossover 80,
Top coil of slot 4, bottom coil of slot 18, top coil of slot 3, bottom coil of slot 17, top coil of slot 2, bottom coil of slot 16, top coil of slot 1, bottom coil of slot 15, bottom 72 Top coil,
Bottom coil of slot 14, top coil of slot 71, crossover
88, the upper coil of the slot 57, and the connection point 107 with the crossover 79 are connected in this order.

With this connection, there is one connection at a specific winding pitch (lead wire side: connection between the upper coil of slot 55 and the bottom coil of slot 71).

The winding circuit 133 is connected to the bottom coil of the slot 35, the upper coil of the slot 21, the bottom coil of the slot 36, the upper coil of the slot 22,
Bottom coil, crossover 89, slot 51 bottom coil, crossover
103, top coil in slot 39, bottom coil in slot 53,
Top coil of slot 37, crossover 90, top coil of slot 17, bottom coil of slot 32, top coil of slot 18, bottom coil of slot 33, top coil of slot 19, slot
The bottom coil 34, the upper coil of the slot 20, and the connection point 108 with the crossover 79 are connected in this order.

With this connection, only one connection is made at a specific winding pitch (lead wire side: connection between the bottom coil of the slot 53 and the top coil of the slot 37), and the top coil and the bottom coil of the same pole are connected. There is also one place where the coil is connected using a crossover (lead wire side: connection between the bottom coil of slot 51 and the upper coil of slot 39).

Next, the winding circuits 131, 132, and 133 are not limited to the connection order shown in FIG.

First, on the collector ring side (lead wires 73 and 74 side), the winding circuit 131 includes the upper coil of the slot 38 and the bottom coil of the slot 54, the upper coil of the slot 36 and the bottom coil of the slot 52, and the slot 72. Bottom coil and slot 56
One set of the upper coil, the bottom coil of the slot 70, and the upper coil of the slot 54 is connected to the crossover 80 and the crossover 79, respectively, and the remaining three sets are connected at a specific winding pitch (16 pitches). Then, the upper coil of slot 35 and the bottom coil of slot 50, the upper coil of slot 40 and the bottom coil of slot 55, the bottom coil of slot 68 and the upper coil of slot 53, and the slot
The bottom coil of No. 1 and the upper coil of the slot 58 are connected on the collector ring side with a winding pitch (pitch number 15) as a reference.

On the other hand, on the turbine side opposite to the lead wire, the upper coil of the slot 35 and the upper coil of the slot 53 are connected via a crossover 85, and the bottom coil of the slot 1 and the bottom coil of the slot 55 are crossover. Connected via 86, slot 38
Top coil and bottom coil of slot 52, top coil of slot 36 and bottom coil of slot 50, bottom coil of slot 68 and top coil of slot 54, bottom coil of slot 70 and top coil of slot 56, bottom of slot 72 The coil and the upper coil of the slot 58 are connected at a winding pitch (pitch number 14) as a reference on the turbine side.

Even in this connection, the coils connected to the crossovers 79 and 80 are the third or fifth upper and lower coils counted from the winding axis of the P3 pole or P4 pole, similarly to FIG. The connection point with a specific winding pitch 16 is the lead wire 7
There are three places on the 3, 74 side.

The winding circuit 132 connects the bottom coil of the slot 69 to the crossover 80 on the lead wires 73 and 74 side.
Connect the upper coil of slot 57 to crossover 79, and
Is connected to the bottom coil of slot 71 at a specific winding pitch (16 pitches), the bottom coil of slot 19 and the top coil of slot 4, the bottom coil of slot 18 and the top coil of slot 3, and the top coil of slot 17 Bottom coil and slot 2 top coil, slot 16 bottom coil and slot 1 top coil, slot 15 bottom coil and slot 72 top coil and slot
The 14 bottom coils and the upper coil of the slot 71 are connected on the collector ring side at a winding pitch (pitch number 15) as a reference.

On the turbine side, one of the bottom coil of the slot 69 and the upper coil of the slot 55 or the bottom coil of the slot 71 and the upper coil of the slot 57 is connected to the crossover wire 8.
7 and 88, and the other at the turbine side with a reference winding pitch (pitch number 14). Also, the bottom coil of slot 19 is connected to crossover 87, the upper coil of slot 71 is connected to crossover 88, the upper coil of slot 4 and the bottom coil of slot 18, the upper coil of slot 3 and the bottom of slot 17 Coil, top coil of slot 2 and bottom coil of slot 16, top coil of slot 1 and bottom coil of slot 15, slot 7
2 The upper coil and the bottom coil of the slot 14 are connected on the turbine side at a winding pitch (pitch number 14) as a reference.

Even in this connection, the coils connected to the crossovers 79 and 80 are the second upper coil and the bottom coil counted from the winding axis of the P4 pole, and have a specific winding pitch (pitch number).
The location connected in 16) is also one location on the lead wires 73 and 74 side.

Next, on the lead wires 73 and 74, the winding circuit 133 includes the upper coil of the slot 18 and the bottom coil of the slot 33, the upper coil of the slot 19 and the bottom coil of the slot 34, and the upper coil of the slot 20 and the slot. 35 bottom coils, slots
One set of the upper coil 21 and the bottom coil of the slot 36 is connected to the crossovers 79 and 80, respectively, and the remaining three sets and the slot 22 are connected.
The upper coil and the bottom coil of the slot 37, and the upper coil of the slot 17 and the bottom coil of the slot 32 are connected on the collector side at a winding pitch (pitch number 15) as a reference. Also, connecting the bottom coil of the slot 51 and the upper coil of the slot 39 to the
3 and the bottom coil of slot 53 and slot 37
The upper coil is connected at a specific winding pitch (16 pitches).

On the other hand, on the turbine side (the side opposite to the lead wire), the bottom coil of the slot 37 is connected to the crossover 89, the upper coil of the slot 17 is connected to the crossover 90, and the bottom coil of the slot 51 and the slot 37 are connected. Either the upper coil of the slot 53, the bottom coil of the slot 53, or the upper coil of the slot 39 is connected to the crossover line 89 and the crossover line 90, respectively, and the other is fixed at the turbine side with a fixed winding pitch (pitch number 14). ) To connect. Also, the bottom coil of the slot 32 and the upper coil of the slot 18, the bottom coil of the slot 33 and the upper coil of the slot 19,
The bottom coil of slot 34 and the upper coil of slot 20; the bottom coil of slot 35 and the upper coil of slot 21;
14) Connect.

By connecting in this manner, the crossover 7
The coils connected to 9 and 80 are the second, third, fourth or fifth top and bottom coils counted from the winding axis of the coil constituting the P2 pole. The connection point with a pitch number of 16) is on the lead wires 73 and 74.
There is one place where the top and bottom coils of the P3 pole are connected using a crossover.

The other connection order of the winding circuits 131, 132 and 133 has been described above. As is clear from the description of the connection order shown in FIG. Connections with a specific winding pitch different from the winding pitch exist only on the collector ring side (lead wire side), and there are 15 locations for three phases (for example, the upper coil of slot 37 and Bottom coil). 9 crossovers at exit lines 73-78 (crossovers 79-84, 103-105)
When viewed in the axial direction, the overlap is 7 rings (crossover 103-105
Becomes the same ring).

On the other hand, the turbine side (the side opposite to the lead wire)
The number of crossovers is 18 (crossovers 85 to 102), and the overlap is 6 rings when viewed in the axial direction (crossovers 91, 94, and 99 have the same ring, crossovers 92, 95, and 97 have the same ring, crossover) Lines 88, 93 and 10
0 is the same ring, crossovers 85, 87, and 98 are the same ring, crossovers 86, 90, and 102 are the same ring, and crossovers 89, 96, and 101 are the same ring).

As described above, in the present invention, as compared with the conventional connection shown in FIG. 4, the total number of crossovers and the overlap of crossovers as viewed in the axial direction are the same, but a certain winding pit differs from the specific connection. Since the number of connection points at the winding pitch is reduced by three, the end structure of the generator can be simplified.

In FIG. 1, the winding circuit 131 connects the upper coil and the lower coil of the P3 pole to the crossover wires 79 and 80. However, the winding circuit 131 connects the upper coil and the bottom coil of the P4 pole to the crossover wires 79 and 80. Can also be connected. In that case, the winding circuit 132
The top coil of slot 7 and the bottom coil of slot 59 are connected with a crossover, the top coil of slot 72 and the bottom coil of slot 15, the top coil of slot 1 and the bottom coil of slot 16, and slot 2
And the bottom coil of the slot 17 and the bottom coil of the slot 3 and the bottom coil of the slot 18 are connected to the crossover wires 79 and 80, respectively. The winding circuit 133 is similar to that of FIG. 1 by connecting the upper coil of the slot 20 and the bottom coil of the slot 35, and connecting the bottom coil of the slot 51 and the upper coil of the slot 39 to the crossovers 79 and 80, respectively. Can be connected.

The winding of the armature winding of the rotating electric machine is performed as described above. The upper coil and the bottom coil connected to the crossover on the collector ring side are the second to the second from the winding axis.
Since the fifth coil is used, the voltage imbalance between the three winding circuits of each phase can be reduced, and the potential difference between the adjacent coils of other phases can be suppressed.

Further, when the maximum voltage of the interphase coil according to the present invention is calculated, it is about 72.6% of the terminal voltage. Since the conventional connection maximum voltage different phase between the coils is 92.6%, when the breakdown voltage of the coil insulation to V _m, the conventional wiring method to be below the terminal voltage V = V _m /0.926=1.08 V _m of the generator I not do, but equal to or less than V = V _m /0.726=1.38V _m in wiring method in FIG.
That is, when the rated voltage of the generator is limited by the insulation of the coil, the terminal voltage can be increased by about 28% by using the connection method of the present invention as compared with the conventional connection method.

FIGS. 10 and 11 show another embodiment of the present invention.
FIG. 10 shows one phase, and FIG. 11 shows three phases of the connection in FIG.

In FIG. 10, the winding circuits 131 and 132 have the same connection as in FIG.
The second bottom coil and the top coil counted from the winding axis of the coil constituting the P3 pole are connected to the crossover wires 79 and 80, respectively. That is, the winding circuit 133 is connected to the connection point 111 with the crossover 80.
From slot 39 upper coil, slot 53 bottom coil, slot 37 upper coil, crossover 89, slot 17 upper coil, slot 32 bottom coil, slot 18 upper coil, slot 33 bottom coil, slot 19 lower coil Upper coil, slot
34 bottom coil, slot 20 top coil, slot 35 bottom coil, slot 21 top coil, slot 36 bottom coil, slot 22 top coil, slot 37 bottom coil, crossover 90, slot 51 bottom coil , Connection point 10 with crossover 79
It is configured by connecting in the order of 8.

In FIG. 10, the upper coil of the slot 37 is connected to the crossover 89, the bottom coil of the slot 51 is connected to the crossover 90, and the upper coil of the slot 39 and the bottom coil of the slot 53 have a pitch of 14. Connection at winding pitch, but slot 37
The upper coil of the slot 51 and the bottom coil of the slot 51 may be connected at a winding pitch of 14, the upper coil of the slot 39 may be connected to the crossover 89, and the bottom coil of the slot 53 may be connected to the crossover 90. .

With this connection, the coils connected to the connecting wires 79 and 80 are the second upper coil and the bottom coil counted from the winding axis of the winding (coil) constituting the P3 pole, and have a specific pitch number of 16 Is connected to the collector ring side (the lead wires 73 and 74 side) at one winding pitch. Also,
A crossover (crossover 103 in FIG. 1) connecting the upper coil and the bottom coil of the same pole is not required.

Therefore, the connection points with a specific winding pitch different from the fixed reference winding pitch exist only on the collector ring side (lead wire side), and there are 15 places for three phases (for example, the lead wire side). , The upper coil of the slot 37 and the bottom coil of the slot 53). In addition, the crossover line is the lead line 73
There are 6 rings (crossovers 79 to 84) on the ~ 78 side, and the overlap is 2 rings when viewed in the axial direction (crossovers 79, 81 and 83 are the same ring, crossover 80
And 82 and 84 are the same ring).

On the other hand, on the turbine side (opposite to the lead wire), there are 18 crossovers (crossovers 85 to 102), and the overlap is six rings (crossovers 91, 94, and 99 are the same when viewed in the axial direction). Rings, crossovers 92, 96 and 97 are the same ring, crossovers 88, 93 and 100 are the same ring, crossovers 85, 87 and 98 are the same ring, crossover 86
89 and 101 are the same ring, and crossovers 90, 95 and 102 are the same ring).

As described above, in the embodiment shown in FIGS. 10 and 11, the number of connection points at a specific winding pitch is reduced by three and the number of crossover wires is reduced by three on the collector ring side as compared with the conventional connection. In addition, the overlap of the crossovers seen in the axial direction is 5
Ring decreases. Therefore, the structure of the coil end of the generator can be simplified.

In the embodiments shown in FIGS. 10 and 11, when the maximum voltage of the coil between different phases is calculated, it is about 88.9% of the terminal voltage. In the conventional connection, the maximum voltage of the interphase coil is about 92.6%. When the breakdown voltage of the coil insulation to V _m, the conventional connection but must be below the terminal voltage V = V _m /0.926=1.08 V _m of the generator, FIG. 10, V = V in the embodiment shown in FIG. 11 _m / 0.889 =
1.12V _m or less. Therefore, when the rated voltage of the generator is limited by the insulation of the coil, the terminal voltage can be increased by about 4% as compared with the conventional connection.

[0078]

As described above, according to the present invention, the voltage imbalance between the three winding circuits of each phase can be reduced, and the voltage of the adjacent interphase coil can be reduced. As a result, the temperature rise of the armature winding due to the circulating current can be suppressed, and the terminal voltage can be increased when the rated voltage of the generator is limited by the withstand voltage of the coil insulation.

[Brief description of the drawings]

FIG. 1 is a connection diagram of one phase of an armature winding showing one embodiment of the present invention.

FIG. 2 is a connection diagram showing one embodiment of the present invention.

FIG. 3 is a connection diagram of one phase of an armature winding showing an example of a conventional example.

FIG. 4 is a connection diagram showing an example of a conventional example.

FIG. 5 is a conceptual diagram illustrating an example of a conventional rotating electric machine.

FIG. 6 is a conceptual diagram illustrating an example of a rotating electric machine to which the present invention is applied.

FIG. 7 is an explanatory diagram of a coil arrangement of an armature winding according to the present invention.

FIG. 8 is a slot sectional view of a stator core according to the present invention.

FIG. 9 is a schematic connection diagram of an upper coil and a bottom coil according to the present invention.

FIG. 10 is a connection diagram for one phase of an armature winding showing another embodiment of the present invention.

FIG. 11 is a connection diagram illustrating another embodiment of the present invention.

[Explanation of symbols]

1 to 72 slot number, 73 to 78 lead wire, 79 to 105 crossover wire, 106 to 123 connection point between upper coil or bottom coil and crossover wire, 124 stator iron core, 125 armature winding Coil, 126 ... Armature winding bottom coil, 127 ... Stator slot,
128 ... wedge, 130-133 ... parallel circuit, 134-142 ... crossover, 143 ... generator, 144 ... terminal box, 145 ...
Bushing, P1, P2, P3, P4 ... poles.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hidenari Otani 3-1-1, Sachimachi, Hitachi-shi, Ibaraki Pref. Hitachi, Ltd. Hitachi Plant (72) Inventor Akiomi Senba Sachimachi, Hitachi-shi, Ibaraki No. 1-1 C-term F-term in Hitachi, Ltd. Hitachi Plant (reference) 5H603 AA09 BB02 BB05 BB07 BB12 CA01 CA05 CB02 CB17 CC03 CC17 CD02 CD04 CD21 CE02

Claims (8)

[Claims] A stator core is provided with 72 slots, and a three-phase star-connected armature winding is provided with three first windings for each phase.
A three-phase four-pole rotating electric machine configured by connecting three winding circuits in parallel with each other and winding two layers in each slot, wherein the four poles (P1, P2, P3, and P4) are respectively The first to third phases
P3 pole: Six upper and bottom coils of the first winding circuit P2 pole: Six upper and bottom coils of the second winding circuit P3 pole: Four upper and lower coils of a three-winding circuit, and two upper and lower coils of a first winding circuit located second and fourth from the winding axis of the pole P4 pole: Third winding circuit Four upper coils and a bottom coil, and two upper coils and a bottom coil of a second winding circuit located at the second and fourth positions from the winding axis of the poles. Six upper coils constituting the four poles And a coil other than a coil adjacent to a coil of a different phase on the collector ring side of the bottom coil is connected to the crossover. 2. A three-phase winding circuit in which 72 slots are provided in a stator core, and three coils of three phases connected in series are connected in series with eight coils for each phase. A three-phase four-pole rotating electric machine configured in parallel connection and wound around each slot in two layers, wherein the four poles (P1, P2, P3, P4)
Is constituted by the first to third winding circuits of each phase as follows. P1 pole: Six upper and bottom coils of the first winding circuit P2 pole: Six of the second winding circuits Top and bottom coils P3 pole: Four top and bottom coils of the third winding circuit and two top and bottom coils of the first winding circuit located second and fourth from the winding axis of the pole Coil P4 pole: Four upper and lower coils of the third winding circuit, and two upper and lower coils of the second winding circuit located second and fourth from the winding axis of the pole. A winding method for a rotating electric machine, wherein the second to fifth coils counted from the winding axis on the collector ring side of the six upper and lower coils constituting the poles are connected to a crossover. . 3. The stator core is provided with 72 slots, and a three-phase star-connected armature winding is provided with three first windings for each phase.
A three-phase four-pole rotating electric machine configured by connecting three winding circuits in parallel with each other and winding two layers in each slot, wherein the four poles (P1, P2, P3, and P4) are respectively The first to third phases
P3 pole: Six upper and bottom coils of the first winding circuit P2 pole: Six upper and bottom coils of the second winding circuit P3 pole: Four upper and lower coils of a three-winding circuit, and two upper and lower coils of a first winding circuit located second and fourth from the winding axis of the pole P4 pole: Third winding circuit The four upper coils and the bottom coil, and the two upper coils and the bottom coil of the second winding circuit located at the second and fourth positions from the winding axis of the pole The number of winding pitches on the collector ring side of the rotating electric machine To 15,
The number of winding pitches on the turbine side is set to 14, and coils other than coils adjacent to coils of different phases on the collector ring side among the six upper and lower coils constituting the four poles are connected to the crossover. A winding method for a rotating electric machine, characterized in that: 4. A three-phase winding circuit in which 72 slots are provided in a stator core and eight coils are connected in series for each phase with three-phase star-connected armature windings. A three-phase four-pole generator configured in parallel connection and wound around each slot in two layers, wherein the four poles (P1, P2, P3, and P4) are the first to third poles of each phase, respectively. P1 pole: Six top and bottom coils of the first winding circuit P2 pole: Six top and bottom coils of the second winding circuit P3 pole: Third Four top and bottom coils of the winding circuit, and two top and bottom coils of the first winding circuit located second and fourth from the winding axis of the pole P4 pole: of the third winding circuit Four upper coils and a lower coil, and two upper coils and a lower coil of a second winding circuit located second and fourth from the winding axis of the pole The number of winding pitches on the lead wire side of the generator is 15, and the number of winding pitches on the opposite side of the lead wire side is 14, and the lead out of the six upper and bottom coils constituting the four poles A winding method for a generator, wherein a coil other than a coil adjacent to a coil of a different phase on a wire side is connected to a crossover. 5. A stator core having 72 slots, and a three-phase star-connected armature winding having three primary windings for each phase.
A three-phase four-pole rotating electric machine configured by connecting three winding circuits in parallel with each other and winding two layers in each slot, wherein the four poles (P1, P2, P3, and P4) are respectively The first to third phases
P3 pole: Six upper and bottom coils of the first winding circuit P2 pole: Six upper and bottom coils of the second winding circuit P3 pole: Four upper and lower coils of a three-winding circuit, and two upper and lower coils of a first winding circuit located second and fourth from the winding axis of the pole P4 pole: Third winding circuit Four upper coils and a bottom coil, and two upper coils and a bottom coil of a second winding circuit located at the second and fourth positions from the winding axis of the poles. Six upper coils constituting the four poles A rotating electric machine, wherein a coil other than a coil adjacent to a coil of a different phase on the collector ring side of the bottom coil is connected to a crossover. 6. A three-phase winding circuit in which 72 slots are provided in a stator core, and three-phase star-connected armature windings are connected in series with eight coils for each phase. A three-phase four-pole rotating electric machine configured in parallel connection and wound around each slot in two layers, wherein the four poles (P1, P2, P3, P4)
Is constituted by the first to third winding circuits of each phase as follows. P1 pole: Six upper and bottom coils of the first winding circuit P2 pole: Six of the second winding circuits Top and bottom coils P3 pole: Four top and bottom coils of the third winding circuit and two top and bottom coils of the first winding circuit located second and fourth from the winding axis of the pole Coil P4 pole: Four upper and lower coils of the third winding circuit, and two upper and lower coils of the second winding circuit located second and fourth from the winding axis of the pole. An armature winding configured to connect the second to fifth coils counted from the winding axis on the collector ring side of the six upper coils and the bottom coils constituting the poles so as to connect to the connecting wires. Rotating electric machine. 7. A stator core is provided with 72 slots, and a three-phase star-connected armature winding is provided with three first armature windings for each phase.
A three-phase four-pole rotating electric machine configured by connecting three winding circuits in parallel with each other and winding two layers in each slot, wherein the four poles (P1, P2, P3, and P4) are respectively The first to third phases
P3 pole: Six upper and bottom coils of the first winding circuit P2 pole: Six upper and bottom coils of the second winding circuit P3 pole: Four upper and lower coils of a three-winding circuit, and two upper and lower coils of a first winding circuit located second and fourth from the winding axis of the pole P4 pole: Third winding circuit The four upper coils and the bottom coil, and the two upper coils and the bottom coil of the second winding circuit located at the second and fourth positions from the winding axis of the pole The number of winding pitches on the collector ring side of the rotating electric machine To 15,
The number of winding pitches on the turbine side is set to 14, and coils other than coils adjacent to coils of different phases on the collector ring side among the six upper and lower coils constituting the four poles are connected to the crossover. A rotating electric machine comprising an armature winding according to claim 1. 8. A stator core is provided with 72 slots, and three first to third winding circuits in which eight coils are connected in series for each phase with three-phase star-connected armature windings. A three-phase four-pole generator configured in parallel connection and wound around each slot in two layers, wherein the four poles (P1, P2, P3, and P4) are the first to third poles of each phase, respectively. P1 pole: Six top and bottom coils of the first winding circuit P2 pole: Six top and bottom coils of the second winding circuit P3 pole: Third Four top and bottom coils of the winding circuit, and two top and bottom coils of the first winding circuit located second and fourth from the winding axis of the pole P4 pole: of the third winding circuit Four upper coils and a lower coil, and two upper coils and a lower coil of a second winding circuit located second and fourth from the winding axis of the pole The number of winding pitches on the lead wire side of the generator is 15, and the number of winding pitches on the opposite side of the lead wire side is 14, and the lead out of the six upper and bottom coils constituting the four poles A generator comprising: a stator on which an armature winding is wound so that a coil other than a coil adjacent to a coil of a different phase on a wire side is connected to a crossover.