JP5963665B2 - 2-axis excitation generator - Google Patents

Description

  The present invention relates to a biaxial excitation generator installed in a power plant or the like, and particularly relates to a field winding provided in a rotor of a biaxial excitation generator.

Recently, construction of solar power generation facilities and wind power generation facilities is thriving on a global scale in view of global environment and resource problems. The power generation output from the power generation facility using sunlight or wind power is controlled by the season and the weather and does not always continue to be stable. Accordingly, for example, when an output from the solar power generation facility is connected to an existing power system, various problems need to be solved in order to maintain the stability of the power system.
On the other hand, a concept of a two-axis excitation generator system for improving power system stability has been proposed (for example, Non-Patent Document 1).
It is known that this biaxial excitation generator is an effective means for improving transient stability and dynamic stability by using an appropriate excitation system. As described above, as the plans for power generation facilities using natural energy such as solar power generation facilities, wind power generation facilities, and the like become popular, power generation facilities using the above-described two-axis excitation generator instead of the conventional synchronous generator Therefore, there is a demand for practical use of a stable power system bus.

Here, the field winding of the conventional synchronous generator is composed of only the d-axis winding that generates a magnetomotive force in the d-axis direction, whereas the field winding of the two-axis excitation generator is d It consists of two pieces: an axial winding and a q-axis winding that generates a magnetomotive force in the q-axis direction. In order to install such two windings in the rotor, it is necessary to distribute the space in the rotor to the two windings. Therefore, compared with a conventional synchronous generator, the number of turns of one winding is reduced and the magnetomotive force is reduced. In addition, depending on the arrangement of the two windings, both of them interfere with each other at the winding end, which complicates the winding structure.
As described above, the field winding of the two-axis excitation generator needs to adopt a winding configuration such as increasing the generated magnetic flux and simplifying the winding end structure. The prior art document which solved the problem is not disclosed.

IEEJ Transactions B Vol 124.2004, No5 P697-P704

  The present invention is a two-shaft which maintains the same generator structure as a conventional synchronous generator, increases the rotor magnetic flux as much as possible, and simplifies the structure of the field winding end. It aims to provide an excitation generator.

This invention relates to a biaxial-fed generator, the radial cross section of the rotor, within a circumferentially disposed slot, first formed under the coil groups which extends in the axial longitudinal direction of the rotor 1 and a second coil are provided, and a Y-axis and an X-axis that are orthogonal to each other are defined as a coordinate system, and the first coil is in a position symmetrical with respect to the X-axis . The reciprocating conductor is disposed on the outer diameter side of the slot, and the first reciprocating conductor is connected to each other by forming a substantially U-shaped portion across the Y axis at the slot end at one end of the rotor. The second coil has a second reciprocating conductor disposed on the inner diameter side of the slot at a position symmetrical with respect to the Y axis, and substantially U across the X axis at the slot end of one end of the rotor. Each of the second round-trip conductor It is those to which you are connected.

Since the two-axis excitation generator according to the present invention employs the above-described configuration, it can generate a large rotor magnetic flux with substantially the same physique as the conventional synchronous generator. Since the coil end and the second coil end do not interfere with each other, there is an effect that the structure of the coil end is simplified.

FIG. 4 is a perspective view showing a coil arrangement and a coil end portion on a rotor cross section according to the first embodiment. FIG. 6 is a perspective view showing a coil arrangement and a coil end portion on a rotor cross section according to a second embodiment. FIG. 10 is a perspective view showing a coil arrangement and a coil end portion on a rotor cross section according to a third embodiment.

Embodiment 1 FIG.
Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a rotor 1 of a two-axis excitation generator 100 according to the first embodiment. In FIG. 1, the stator portion is not shown. Here, FIG. 1A is a view showing a coil arrangement on a radial cross section of the rotor, and FIG. 1B is a perspective view showing a coil end portion in a slot end portion 1a at one end of the rotor. .
In FIG. 1A, the rotor 1 of the two-axis excitation generator 100 is provided with a plurality of slots 4 extending in the axial longitudinal direction in the radial cross section. The slots 4 have a predetermined depth and are arranged at equal intervals on the circumference. As shown in FIG. 1 (a), on the radial cross section of the rotor 1, as a coordinate system, a Y-Y axis (hereinafter referred to as the Y axis) and an XX axis (hereinafter referred to as the X axis) orthogonal thereto. The first coil 2 formed by a plurality of simplified elementary coil groups disposed in each slot 4 is provided at a position symmetrical with respect to the X axis. Here, the term “element coil” refers to a coil in which a predetermined number of conductors are provided with a predetermined insulation and arranged in a predetermined number of slots 4, respectively, in three slots 4 in FIG. ing. As shown in FIG. 1B, which will be described later, the first coil 2 is connected across the Y axis at the slot end 1a so as to connect the reciprocating conductor extending in the axial direction. Is provided. Further, as shown in FIG. 1A, a second coil 3 is provided at a symmetrical position with respect to the Y axis, and each slot is crossed over the X axis at the slot end 1a in the same manner as the first coil 2. It is provided so that it may connect for every element coil.
Here, in the two-axis excitation generator 100, the first coil 2 is, for example, a d-axis winding, the second coil 3 is a q-axis winding, and the direction of the excitation current of the coil is shown in FIG. Shown in (a). This excitation current generates a rotor magnetic flux 20 by the first coil 2 in the Y-axis direction and a rotor magnetic flux 30 by the second coil 3 in the X-axis direction.
In FIG. 1A, the first coil 2 and the second coil 3 are shown as a single coil for convenience, but in the first embodiment, three elementary coils are arranged in the three slots 4 respectively. The number of these elementary coils is not limited to this example.

FIG. 1B is a perspective view showing the slot end 1 a of the rotor 1 on the side opposite to the coil exciting terminal that is one end of the rotor 1. As described above, at the slot end 1a, the first coil 2 is provided so as to form a substantially U-shaped portion 2a so as to straddle the Y axis and to connect the reciprocating conductors of the elementary coils. The second coil 3 is also provided in the same manner by forming a substantially U-shaped portion 3a so as to straddle the X axis.
The substantially U-shaped part 2a of the first coil 2 and the substantially U-shaped part 3a of the second coil 3 are in the same plane in the axial longitudinal direction of the rotor 1, that is, the same length from the slot end 1a. It is provided to become. FIG. 1A shows an example in which the slot 4 is locally provided on the circumference, and the first coil 2 and the second coil 3 are arranged in this slot 4 with the same number of elementary coils. It may be a case where the elementary coils are arranged in a number of slots. FIG. 1A shows an example in which a plurality of slots 4 are locally provided on the circumference. However, a plurality of slots 4 may be provided over the entire circumference. One coil 2 and second coil 3 may have the same number of prime coils or different numbers of arrangements.

  As described above, the biaxial excitation generator 100 according to the first embodiment has a configuration in which the first coil 2 extends across the Y axis and the second coil 3 extends across the X axis in the structure of the rotor 1. Since the first coil 2 and the second coil 3 intersect and do not interfere with each other at the slot end 1a, the end structure is simplified and miniaturized, and energy consumption is reduced. As a result, the manufacturing cost can be reduced, and it also has a function of generating a rotor magnetic flux of an arbitrary size in each of the two axial directions.

Embodiment 2. FIG.
Next, Embodiment 2 will be described with reference to the drawings.
FIG. 2A is a view showing a coil arrangement on the rotor radial cross section similar to FIG. 1A of the first embodiment described above, and FIG. 2B is a perspective view showing the same coil end. FIG.
In FIG. 2A, the upper, lower, and second coils 3 are arranged on the inner diameter side of the rotor 1 in the slot 4, and the upper portion of the second coil 3 and on the outer diameter side of the slot 4. Upper, lower and first coils 2 are arranged. In the second embodiment, an example is shown in which the respective elementary coils forming the first coil 2 and the second coil 3 are arranged in six slots 4. As in the first embodiment described above, each element coil of the first coil 2 is provided at the slot end 1a so as to extend over the Y axis so as to form a substantially U-shaped portion 2a. Each element coil of the second coil 3 is connected and provided so as to form a substantially U-shaped portion 3a across the X axis.
As described above, in the second embodiment, an end structure in which the first coil 2 and the second coil 3 cross and do not interfere with each other can be adopted as in the first embodiment. Simplification and cost reduction can be achieved. Further, the distance between the coil centers is increased, the effective magnetic pole area is increased, the amount of generated magnetic flux is increased, and the rotor magnetomotive force is increased accordingly.

Embodiment 3 FIG.
Next, Embodiment 3 will be described with reference to the drawings.
FIG. 3A is a diagram showing a coil arrangement on the rotor radial section similar to FIG. 1A of the first embodiment, and FIG. 3B is a perspective view showing the same coil end. is there.
In FIG. 3A, a Y-axis and an X-axis that are orthogonal as a coordinate system on the radial section, and a first quadrant, a second quadrant, a third quadrant, and a fourth quadrant formed by the Y-axis and the X-axis. A quadrant is defined. The first coil 2 is arranged in the second quadrant and the fourth quadrant, and the second coil 3 is arranged in the first quadrant and the third quadrant, and the slot end 1a is the same as in the first embodiment. Are formed so as to form substantially U-shaped portions 2a and 3a, respectively.
The rotor magnetic flux 20 generated by the first coil 2 is in the direction of a line connecting the first quadrant and the third quadrant, as shown in FIG. 3A, and the rotation generated by the second coil 3 is. The child magnetic flux 30 is in the direction connecting the second quadrant and the fourth quadrant. As shown in FIG. 3B, the substantially U-shaped portion 2a of the first coil 2 is formed so as to straddle the line connecting the first quadrant and the third quadrant, and the second coil 3 The substantially U-shaped portion 3a is formed so as to straddle a line connecting the second quadrant and the fourth quadrant. Furthermore, the end surface 2b of the substantially U-shaped portion 2a of the first coil and the end surface 3b of the approximately U-shaped portion 3a of the second coil 3 are staggered in the axial longitudinal direction. That is, the end surface 3b is provided so as to be located at a position farther away from the slot end portion 1a in the axial longitudinal direction than the end surface 2b. The staggered arrangement may be a staggered arrangement in which the end surface 2b is separated from the slot end portion 1a in the axial longitudinal direction more than the end surface 3b.
By adopting such a configuration, there is an effect that the effective magnetic pole area is further increased, the amount of generated magnetic flux is increased, and the rotor magnetomotive force is increased.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

1 rotor, 1a slot end, 2 first coil, 2a substantially U-shaped part,
2b end face, 3nd coil, 3a substantially U-shaped part, 3b end face, 4 slots,
20 Rotor flux by the first coil, 30 Rotor flux by the second coil,
100 Two-axis excitation generator.

Claims (3)

A biaxial excitation generator, wherein a first coil formed of a group of elementary coils extending in a longitudinal axis direction of the rotor in a circumferentially arranged slot in a radial cross section of the rotor; , A second coil is provided, and an orthogonal Y-axis and X-axis are defined as a coordinate system, and the first coil is a first reciprocating conductor at a position symmetrical to the X-axis . Is arranged on the outer diameter side of the slot, and at the slot end of one end of the rotor, a substantially U-shaped portion is formed across the Y axis to connect the first reciprocating conductors respectively. The second coil has a second reciprocating conductor disposed on the inner diameter side of the slot at a position symmetrical to the Y-axis, and at the slot end of one end of the rotor, U-shaped across the X-axis Biaxial fed generator, characterized by connecting said second reciprocating conductors each form a. 2. The two-axis according to claim 1, wherein the rotor magnetic flux generated by the first coil is in the Y-axis direction, and the rotor magnetic flux generated by the second coil is in the X-axis direction. Excitation generator. An end surface in the axial longitudinal direction of the substantially U-shaped portion of the first coil and an end surface in the axial longitudinal direction of the approximately U-shaped portion of the second coil are in the same plane in the axial longitudinal direction. The two-axis excitation generator according to claim 1 .

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