JPS58218845A - Armature coil for rotary electric machine - Google Patents

Abstract

PURPOSE:To remove output current flowing through a cooling pipe, and to reduce output current loss by electrically connecting a coil conductor, an electric connecting part connecting said coil conductor and the cooling pipe at one end of the armature coil. CONSTITUTION:A plurality of the coil conductors 3 and the cooling pipes 5, electric specific resistance thereof is larger than that of the coil conductors 3 and to which refrigerant flow paths are formed, are each dislocated mutually and the armature coils 1c, 1d are formed, and the coil conductors 3 and the cooling pipes 5 are electrically connected collectively by the electric connecting tools 8 at one ends of the armature coils 1c, 1d. The cooling pipes 5 are insulated electrically from the electric connecting parts 8 and the coil conductors 3 by insulators 11 fitted near the electric connecting parts 8 at the other ends of the armature coils 1c, 1d. Accordingly, output currents do not flow through the electric circuits of the cooling pipes 5, and output current loss is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an armature coil for a rotating electric machine, and particularly relates to an armature coil for a companion rotating electric machine that is constructed by transposing a coil conductor and a cooling pipe.Increasing the single machine capacity of a rotating electric machine As one method, the armature winding, which was conventionally housed in the stator core slot, is placed in the gap between the slotless stator core and the rotor to create a hole-gap armature winding structure, while the rotor A so-called superconducting generator, which has a structure consisting of a superconducting rotor with a built-in superconducting field winding, has come to be used.

The air-gap armature winding placed at medium pressure in the air-gap between the stator core and rotor is directly exposed to strong magnetic field neutralization from the rotor, so the coil conductor of the armature coil constituting the air-gap armature winding is This has the problem of large eddy current loss, and its cross-sectional configuration is different from that of conventional armature coils inserted into core slots. A conventional example of an armature coil constituting this air-gap armature winding is shown in FIG. The armature coil 1 is made by twisting and shaping a plurality of insulated wires 2 with an outer diameter of about 1 m, and includes a coil conductor 3 and a refrigerant flow path 4 whose outer periphery is insulated.
A metallic cooling pipe 5 and an outer insulating layer 6 forming a
It is made up of etc. The coil conductors 3 and the cooling pipes 5 are connected to each other so that the voltage induced between each coil conductor 3 is balanced, the cooling efficiency is improved, and the rigidity of the armature coil 1 against electromagnetic force is increased. Label transposition using filler 7, etc. was performed.

The reason why the coil conductor 3 is constructed of the insulated wire strand 2 in this way is to suppress the eddy current product of the coil conductor 3 during high vILU. In addition, with such an insulated wire element 2, it is impossible to perform the so-called direct cooling method of making it hollow and letting a refrigerant flow through it.
Since the structure must be such that the heat loss generated in the coil conductor 3 is indirectly removed by the cooling pipe 5 dedicated to cooling,
The cooling pipe 5Vi is made of a metal that has a high thermal conductivity required for cooling, and has a higher electrical resistivity than the insulated wire strand 2 (copper), such that the eddy current product of the cooling pipe 5 itself is not much of a problem, such as stainless steel or copper. ~Nickel alloy metals are available.

As shown in Figure 2, such an armature coil 1t is connected in series and parallel in a number suitable for the generator capacity to form an air-gap armature winding. Coil 1,, a b lower armature coil 1b indicated by dotted line
The coil conductors and cooling pipes of these armature coils 1a and 1b of the two-layer air-gap armature winding are electrically connected together at their ends by electrical connection parts 8 by brazing, soldering, etc. ing. During this connection, the insulation coating of the coil conductor and the insulated wire strands coated with the outer insulation layer is removed at positions corresponding to the electrical connection parts 8. Note that 9 connects the refrigerant flowing through the cooling pipe to the armature coil 1.
This is a supply/discharge box that supplies and discharges refrigerant from the outside to the refrigerant via an insulated hose (not shown) or the like.

An electrical connection part 8 connects such a coil conductor and a cooling pipe.
In the coil end connection structure that electrically connects all at once, the third
As shown in the figure, a parallel electric circuit between the coil conductor 3 and the cooling pipe 5 is formed for each armature coil 1a, 1b2 by means of the electrical connection parts 8 at both ends. Therefore, the voltage induced in the coil conductor 3 and the cooling pipe 5 is balanced because the coil conductor 3 and the cooling pipe 5 are Lebel transposed with each other as described above, and the circulating current flows through both parallel electric circuits. However, the output current flows through both electrical circuits. This shunted output current is generally 5
The alternating current is between 0 and 60 Hz, the cooling pipe 5 and the coil conductor 3 are transposed or twisted with each other, and a stator core made of magnetic material is present at the outer diameter position of the armature coils 1a and 1b. Because of this, the reactance value of the resistance and actance becomes dominant in the electrical constants of the two electric circuits, so the output current that flows through the two electric circuits is constrained by the actance. Although the figure shows only one end of the coil end connection part, the structure of the other end is also the same. Note that tfcl 0
is electrical connection part 8.

This is a cotter conductor inserted to make good electrical contact with the lower armature coils la and lb.

As a result, an output current of approximately the same level as that of the coil conductor 3 will be shunted to the cooling pipe 5, which has a higher electric resistivity than the coil conductor 3, but the output current will flow in the cooling pipe 5 by an amount corresponding to the higher electric resistivity. In this case, a larger output current loss occurs than in the coil conductor 3. For example, the coil conductor 3 and the cooling pipe 5
The electrical resistivity ρ1 of the cooling pipe 5 in the following case is approximately 7 x 10-'Ωm, and the cooling pipe 5 is made of a steel insulated wire strand. Since the electrical resistivity ρC of the coil conductor 3 is about 2×10-'Ωm, the cooling pipe 5 has a ratio of these two, i.e., 7×10-1Ω, compared to the coil conductor 3.
An output current loss as large as Ωm-35 occurs. For this reason, the armature coils la and 1b with this cross-sectional configuration have the disadvantage that the efficiency of the generator decreases and the temperature of the armature coils 1a and 1b increases significantly, making it easy to burn out the armature windings. The invention has been made in view of the above points, and its purpose is to provide an armature coil for a rotating electrical machine that reduces output current loss.

That is, the present invention electrically connects the coil conductor and the cooling pipe together at one end of the armature coil using an electrical connection part, and connects the coil conductor, the electrical connection part connected to the coil conductor, and the cooling pipe at the other end. They are characterized by being electrically insulated from each other.

Hereinafter, the present invention will be explained based on the illustrated embodiments. FIG. 4 shows an embodiment of the present invention. Note that parts that are the same as those in the prior art are designated by the same reference numerals, and their explanations will be omitted. In this embodiment, the coil conductor 3 and the cooling pipe 5 are electrically connected together at one end of the armature coils 1c and 1d by an electrical connection part 8, and the coil conductor 3 and the coil conductor 3 are connected to each other at the other end. The electrical connection part 8 and the cooling pipe 5 were electrically insulated from each other. By doing this, no output current flows through the cooling pipe 5, reducing output current loss and providing nine armature coils 1c and 1d.

That is, one end of the end connecting portion of the armature coils 1c, 1a is connected to the electrical connecting component 8 and the coil by an insulator 11 provided near the cooling pipe 5f: the electrical connecting component 8, as shown in the figure. Electrically insulated from conductor 3. At the other end (not shown), the coil conductor 3 and the cooling pipe 5 are electrically connected together by an electrical connection part 8 as in the conventional case.

By doing so, - even if the coil conductor 3 and the cooling pipe 5 are electrically connected together by the electrical connection part 8, the coil conductor 3 and the electrical connection part 8 connected to the coil conductor 3 at the other end. and the cooling pipe 5 are electrically insulated, so the output current is from the armature coil I.
C coil conductor 3 to electrical connection parts 8, armature coil 1
d, the electrical circuit of the cooling pipe 5 becomes independent, and no output current flows through the electrical circuit of the cooling pipe 5. Furthermore, since the cooling pipes 5 are well disposed with respect to each other in the coil body, there is no occurrence of circulating current through the refrigerant supply/discharge box due to voltage imbalance induced between the cooling pipes 5. The increase in loss in the cooling pipe section 5, which was a problem, can be prevented. Since the output current loss can be reduced in this way, it is possible to improve the efficiency of the generator and reduce the temperature rise of armature coils lc and 1d. .

The insulator 11 of the cooling pipe 5 at the coil end connection position is made of ceramic with excellent heat resistance.
“Solid materials and organic film insulation materials are good.

The same effect as in this embodiment can be obtained not only at one end of the coil connection part but also by connecting the coil conductor 3 and the coil conductor 3 at both ends and insulating the electrical connection part 8 and the cooling pipe 5 respectively. However, since the local insulation work for the cooling pipe 50 is not simple, the workability is poor, and the dimensions of the coil ends, which are the most problematic in terms of dielectric strength, are large at both ends, making the coil spacing unnecessarily widened. It is undesirable because it gets stored away.

Another embodiment of the invention is shown in FIG.

At one end of the coil connection section, the two rows of coil conductors 3 are bent and stretched in a direction to widen the coil width, while the cooling pipes 5 are gathered at the center of the coil, and the coil conductors 3 and cooling pipes 5 are connected at the ends of the coils, respectively. The coil conductor 3 and cooling pipe 5 which are separated and connected to these electrical connection parts 8 are insulated by an insulating plate 12. Of course, the coil conductor 3 at the other end and the cooling pipe 5 were electrically connected together via the electrical connection part 8. In this case as well, the same effects as in the above case can be achieved.

As described above, the present invention provides electrical connection between the coil conductor and the cooling pipe at one end of the armature coil, and an electrical connection component connected to the coil conductor and the four coils at the other end. Since the cooling pipe is electrically insulated, the cooling pipe is electrically insulated, and no output current flows through the cooling pipe, thereby obtaining an armature coil for a rotating electric machine with reduced output current loss. I can do it.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the body of the armature coil of a conventional rotating machine, Figure 2 is a connection diagram of a gap armature winding using the armature coil of a conventional rotating machine, and Figure 3 is a diagram of the connection of the armature winding of the conventional rotating machine. A-A and B-B in the diagram
FIG. 4 is a perspective view of the armature coil at the connection section showing the connection section at the end of the coil viewed from the position; FIG. 4 is a connection section showing the connection section at one end of an embodiment of the armature coil of the rotating machine of the present invention; FIG. 5 is a perspective view of a connecting section showing a connecting section at one end of another embodiment of the armature coil of a rotating machine according to the present invention. Ic, 1d... Armature coil, 3... Coil conductor,
5...Cooling pipe, 8...Electrical connection parts, 11...
- Insulator, 12... Insulating plate. Figure 1 Figure 2 Figure rod 3 Figure ¥ 4 Figure ¥ 5' Figure O

Claims (1)

[Claims] 1. In the armature coil of a rotating electric machine, the armature coil of a rotating electric machine is constructed by mutually displacing a coil conductor and a plurality of cooling pipes each having a higher electric resistivity than the coil conductor and forming a coolant flow path. At one end of the child coil, the coil conductor and the cooling pipe are electrically connected together by an electrical connection part, and at the other end, the coil conductor, the electrical connection part connected to the coil conductor, and the cooling pipe are respectively connected. An armature coil for a rotating electric machine that is electrically insulated.