JPH0866002A - Superconducting electric rotating machine - Google Patents

Abstract

PURPOSE: To design a small-sized, light-weight and low reactance machine by setting the axial length at the linear part of an air gap armature winding equal to or shorter than that of the coil of a superconducting field winding closest to the pole side. CONSTITUTION: The axial length ('A') at the linear part of a honeycomb air gap armature winding 5 is set shorter than that ('B') of the coil 2a of a saddle type superconducting field winding 2 closest to the pole side and set substantially equal to that of the coil 2a at the linear part thereof. This structure realizes a generator producing higher output with the same constitution and synchronous reactance. In other words, a small-sized, light-weight and low reactance machine can be designed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a rotor having a saddle type superconducting field winding and a stator having a hexagonal air gap armature winding. The present invention relates to a rotating electric machine, and more particularly to a superconducting rotating electric machine that enables designing a small, lightweight and low reactance machine.

[0002]

2. Description of the Related Art Recently, as one of superconducting rotating electric machines, a superconducting rotating electric machine using a saddle type superconducting field winding for a rotor and a hexagonal air gap armature winding for a stator has been developed. Is coming.

FIG. 6 is a vertical cross-sectional view showing a structural example of a conventional superconducting generator of this type. In FIG. 6, the rotor 1
Is a rotary cryostat, and the saddle type superconducting field winding 2 is supported by a winding mounting shaft 3 inside the cryostat.

On the other hand, the stator 4 is mainly composed of a hexagonal type air gap armature winding 5 and a magnetic shield 6, and the air gap armature winding 5 is provided on the inner diameter side of the magnetic shield 6 with an insulating structure 7 interposed therebetween. It is supported.

FIG. 7 is a cross-sectional view showing an example of the structure of the superconducting field winding 2 on a plane perpendicular to the axis. As shown in FIG. 7, the superconducting field winding 2 is usually formed by several coils per pole, and here, 2a, 2 are arranged in order from the side closer to the magnetic pole.
b, 2c, 2d and 2e.

Further, FIG. 8 is a development view showing a structural example of the superconducting field winding 2. As shown in FIG. 8, the superconducting field winding 2 has a linear portion 2s parallel to the axis and an end portion 2 formed of a curved line.
It consists of t and.

Further, FIG. 9 is a development view showing a structural example of the air gap armature winding 5. As shown in FIG. 9, the air gap armature winding 5 includes a straight portion 5s parallel to the axis and an end portion 5t formed of a curved line for connection.

By the way, the above-mentioned superconducting rotary electric machine, for example, as one of the applications thereof, is a generator, which is improved in efficiency and is reduced in size and weight based on a large field magnetomotive force.
Moreover, improvement of system stability due to low reactance is expected. Therefore, designing a compact low-reactance machine is an important issue, but the dimensional relationship of the superconducting field winding 2 and the air gap armature winding 5 with respect to the axial length is currently studied. The reality is that there is none.

[0009]

As described above, the conventional superconducting rotating electric machine has a problem in that it is difficult to design a compact, lightweight and low reactance. An object of the present invention is to provide a superconducting rotating electric machine that is small in size, light in weight and capable of designing a low reactance machine.

[0010]

In order to achieve the above object, a superconducting device comprising a rotor having a saddle type superconducting field winding and a stator having a hexagonal air gap armature winding. In the rotating electric machine, first, in the invention according to claim 1, the axial length dimension of the linear portion of the air gap armature winding is set to be equal to or less than the axial length dimension of the coil on the most magnetic pole side of the superconducting field winding. I have to.

In the invention according to claim 2, the axial length of the air gap armature winding in the straight portion is made shorter than the axial length of the coil closest to the magnetic pole of the superconducting field winding. In addition, the length of the coil on the magnetic pole side of the superconducting field winding is set to be substantially equal to the axial length of the coil.

Further, in the invention according to claim 3, the axial length of the air gap armature winding is made substantially equal to the axial length of the coil closest to the magnetic pole of the superconducting field winding. I have to.

[0013]

Therefore, in the superconducting rotating electric machine of the present invention,
By setting the axial length of the air gap armature winding in the axial direction to be less than or equal to the axial length of the coil closest to the magnetic pole of the superconducting field winding, the same physical size, the same synchronous reactance, and large output rotation An electric machine can be obtained, that is, a small-sized, lightweight and low-reactance machine can be designed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic vertical cross-sectional view showing a configuration example of a superconducting generator according to the present invention.
The same elements as those of are denoted by the same reference numerals, and the description thereof will be omitted. Only different portions will be described here.

That is, in the superconducting power generator of this embodiment, as shown in FIG. 1, the linear arm portion axial length dimension (dimension "A" dimension in the figure) of the hexagonal air gap armature winding 5 is set to the saddle type. It is shorter than the axial length dimension (dimension "B" dimension in the drawing) of the coil 2a closest to the magnetic pole of the superconducting field winding 2, and the axial direction of the straight portion of the coil 2a closest to the magnetic pole of the superconducting field winding 2 It is designed to be approximately equal to the length dimension.

Next, in the superconducting generator of the present embodiment configured as described above, the length dimension "A" of the straight portion in the axial direction of the hexagonal air gap armature winding 5 is set to the saddle type superconducting field. Winding 2
Is shorter than the axial length dimension "B" of the coil 2a closest to the magnetic pole and is substantially equal to the axial length dimension of the linear portion of the coil 2a closest to the magnetic pole of the superconducting field winding 2. As a result, it is possible to obtain a generator having a large output with the same build and the same synchronous reactance. In other words, it is possible to design a compact, lightweight and low reactance machine.

The grounds for establishing the above-described dimensional relationship for the design of this small, lightweight and low reactance machine will be described below. FIG. 2 is a diagram showing an example of magnetic flux distribution density (solid line) and air gap armature winding interlinkage magnetic flux amount (broken line) created by the superconducting field winding 2 at the position of the air gap armature winding 5.

FIG. 3 is a development view showing an example of the structure of the air gap armature winding 5, and the magnetic flux linkage area of the air gap armature winding 5 is shown by the hatched portion. From FIG. 3, it can be seen that the magnetic flux linkage area at the end portion 5t of the air gap armature winding 5 is smaller than that at the straight portion 5s of the air gap armature winding 5.

If the length of the air gap armature winding 5 in the axial direction is infinite, the amount of magnetic flux interlinking with the air gap armature winding 5 is
It corresponds to the area of the portion surrounded by both axes below the curve shown by the solid line in FIG. In reality, since the axial length of the air gap armature winding 5 in the linear portion is finite, at the end portion 5t of the air gap armature winding 5, the magnetic flux linkage area is smaller than that of the linear portion 5s. The amount of magnetic flux decreases.

This situation is shown in FIG. 2 for two cases. One (hereinafter, referred to as case A) is, as an example according to the present embodiment, the linear length of the air gap armature winding 5 in the axial direction is the straight line of the coil 2a of the superconducting field winding 2 that is closest to the magnetic pole. This is the case where the length is approximately equal to the axial length of the part, and the broken line a
Another example (hereinafter referred to as case B) is, as an example not according to the present embodiment, a coil in which the linear length in the axial direction of the air gap armature winding is the most magnetic pole side coil of the superconducting field winding. Is substantially equal to the axial length dimension of the straight line portion, which is shown by a broken line b.

That is, the area of the portion surrounded by both axes below each broken line indicates the amount of interlinkage magnetic flux in the air gap armature winding, and corresponds to the air gap armature winding induced voltage. It can be seen from FIG. 2 that the case A has a smaller amount of air-gap armature winding interlinkage magnetic flux, that is, the air-gap armature winding induced voltage, but the amount of decrease is not large as compared with the case B. This void armature winding induced voltage is plotted on the lower horizontal axis of FIG. 4 and shown as Va and Vb, respectively.

On the other hand, the absolute value of the synchronous reactance increases in proportion to the effective length of the air gap armature winding. Therefore,
In case A, the absolute value of the synchronous reactance is smaller than that in case B because the length of the air gap armature winding in the linear portion axial direction is shorter. The absolute value of each synchronous reactance is plotted on the upper horizontal axis of FIG. 4 and shown as Xda and Xdb, respectively.

In FIG. 4, the vertical axis represents the armature current,
p. u. When the armature current at a constant synchronous reactance expressed by a value is obtained for each of the above cases, the armature current is calculated from the straight line connecting the point on the upper horizontal axis and the origin and the point on the lower horizontal axis. It is represented by the intersection point of the vertical line drawn from the intersection point with the vertical line standing on the axis and the vertical axis.

Therefore, in FIG. 4, the generator output is a rectangular area having two sides of the line segment shown on the lower horizontal axis and the line segment shown on the vertical axis in each of the above cases. Represented. The case A has a larger generator output than the case B.

From the above, the following can be understood. That is, the axial distribution of the magnetic flux generated by the superconducting field winding 2 at the position of the air gap armature winding 5 sharply decreases when the axial length of the coil 2a closest to the magnetic pole of the superconducting field winding 2 is exceeded. Therefore, the length of the air gap armature winding 5 in the linear portion in the axial direction is made longer than the axial length of the coil 2a on the most magnetic pole side of the superconducting field winding 2 to increase the flux linkage area. Even
The induced voltage in the air gap armature winding 5 does not become so large.

On the other hand, since the absolute value of the synchronous reactance increases in proportion to the effective length of the air gap armature winding 5,
p. u. The armature current represented by the value when the synchronous reactance is constant decreases substantially in inverse proportion to the length of the air gap armature winding 5 in the axial direction of the straight portion.

Therefore, the generator output is the air gap armature winding 5
The maximum value is obtained when the axial length dimension "A" of the linear portion is shorter than the axial length dimension "B" of the coil 2a on the most magnetic pole side of the superconducting field winding 2.

As described above, in the present embodiment, in the superconducting generator including the rotor having the saddle type superconducting field winding and the stator having the turtle shell type air gap armature winding, the turtle shell The axial length dimension "A" of the linear gap axial armature winding 5 is made shorter than the axial length dimension "B" of the coil 2a closest to the magnetic pole of the saddle type superconducting field winding 2. In addition, the length of the coil 2a on the most magnetic pole side of the superconducting field winding 2 is made substantially equal to the axial length of the coil.

Therefore, it is possible to obtain a generator having the same physical size and the same synchronous reactance and a large output. In other words, it is possible to design a small-sized, lightweight and low-reactance machine. As a result, the advantages of compactness, high efficiency, and improvement of system stability expected of the superconducting generator can be maximized.

The present invention is not limited to the above embodiment, but can be implemented in the same manner as described below. In the above-described embodiment, the straight-line axial length dimension “A” of the hexagonal air-gap armature winding 5 is approximately equal to the straight-line axial length dimension of the coil 2a closest to the magnetic pole of the superconducting field winding 2. Although the case where they are made equal has been described, the present invention is not limited to this and, for example, as shown in a schematic vertical cross-sectional view in FIG. The axial length dimension "B" of the coil 2a on the most magnetic pole side of the superconducting field winding 2 may be made substantially equal to this case, and in this case also, the same effect as described above can be obtained. .

That is, the dimensional relationship that maximizes the generator output is determined by the designated reactance and the magnetic flux distribution of the superconducting field winding 2. Since the magnetic flux distribution of the superconducting field winding 2 sharply decreases outside the axial length of the coil 2a on the most magnetic pole side of the superconducting field winding 2, the air gap armature winding 5
The maximum value of the generator output can be obtained even if the axial length dimension "A" of the above is larger than the axial length dimension "B" of the coil 2a on the most magnetic pole side of the superconducting field winding 2. Absent.

Usually, at the low reactance value required for a superconducting generator, the length dimension of the air gap armature winding 5 in the axial direction of the linear portion is such that the magnetic flux distribution of the superconducting field winding 2 begins to decrease. The maximum value of the generator output is obtained at 80% or more of the axial length dimension of the linear portion of the coil 2a closest to the magnetic pole of the winding 2 and not more than the axial length dimension of the coil 2a.

[0033]

As described above, according to the present invention, a superconducting rotating electric machine comprising a rotor having a saddle type superconducting field winding and a stator having a hexagonal air gap armature winding. In, the linear dimension of the air gap armature winding in the axial direction is
Since the dimension is set to be equal to or less than the axial length of the coil on the most magnetic pole side of the superconducting field winding, it is possible to provide a superconducting rotating electric machine that is small in size, lightweight, and capable of designing a low reactance machine.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view showing an embodiment of a superconducting generator according to the present invention.

FIG. 2 is a view showing an example of a magnetic flux distribution density and a gap armature winding interlinkage magnetic flux amount created by a superconducting field winding at a gap armature winding position in the embodiment.

FIG. 3 is a development view showing a configuration example of an air gap armature winding in the same embodiment.

FIG. 4 is a characteristic diagram showing an example for obtaining a generator output from an air gap armature winding interlinkage magnetic flux amount and a synchronous reactance in the example.

FIG. 5 is a schematic vertical sectional view showing another embodiment of the superconducting generator according to the present invention.

FIG. 6 is a vertical cross-sectional view showing a configuration example of a conventional superconducting generator.

FIG. 7 is a transverse cross-sectional view showing a configuration example of a superconducting field winding in a plane perpendicular to the axis.

FIG. 8 is a development view showing a configuration example of a superconducting field winding.

FIG. 9 is a development view showing a configuration example of an air gap armature winding.

[Explanation of symbols]

1 ... Rotor, 2 ... Saddle-type superconducting field winding, 2a, 2b,
2c, 2d, 2e ... Coil, 2s ... Superconducting field winding straight line portion, 2t ... Superconducting field winding end portion, 3 ... Winding attachment axis, 4 ...
Stator, 5 ... Hexagonal type air gap armature winding, 5s ... Air gap armature winding straight portion, 5t ... Air gap armature winding end portion, 6 ... Magnetic shield, 7 ... Insulation structural material.

Claims (3)

[Claims] 1. A superconducting rotating electric machine comprising a rotor having a saddle type superconducting field winding and a stator having a hexagonal air gap armature winding, wherein a straight portion of the air gap armature winding is provided. A superconducting rotating electric machine, wherein an axial length dimension is set to be equal to or less than an axial length dimension of a coil closest to a magnetic pole of the superconducting field winding. 2. A superconducting rotating electric machine comprising a rotor having a saddle type superconducting field winding and a stator having a hexagonal air gap armature winding, wherein a straight portion of the air gap armature winding is provided. The axial length dimension is made shorter than the axial length dimension of the most magnetic pole side coil of the superconducting field winding, and the linear portion axial length of the most magnetic pole side coil of the superconducting field winding is also set. A superconducting rotating electric machine characterized by being made substantially equal in size. 3. A superconducting rotary electric machine comprising a rotor having a saddle type superconducting field winding and a stator having a hexagonal air gap armature winding, wherein a straight portion of the air gap armature winding is provided. A superconducting rotating electric machine, wherein an axial length dimension thereof is made substantially equal to an axial length dimension of a coil closest to a magnetic pole of the superconducting field winding.