JPH0555055A - Reactor iron core - Google Patents

Abstract

PURPOSE:To provide a compact frame for holding an iron core by employing a fitting structure at a part where main legs and yokes are jointed magnetically through an air gap. CONSTITUTION:Main legs 40A, 40B and yokes 31B, 41A are notched, at the end thereof, to form protrusions 40C, 41C which are then fitted each other to joint the main legs 40A, 40B with the yokes 31B, 41A through an air gap 51. The main legs 40A, 40B and the yoke 41A are further tightened each other by means of a tightening bolt 50 penetrating through both protrusions 40C, 41C.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an iron core of an interphase reactor used as a DC high-current power source in a multiphase rectifier in which a transformer and a rectifier are integrally combined.

[0002]

2. Description of the Related Art A multi-phase rectifier of this type uses, for example, two three-phase star connection transformers, and a rectifier is connected to each phase of the two transformers and is connected between the neutral point and the neutral point. DC output can be obtained. An interphase reactor is provided on the neutral point side of the DC output circuit in order to prevent a circulating current from flowing between the phases of the two transformers via the neutral point of the two transformers. FIG. 4 is a circuit connection diagram showing a configuration example of a 6-phase rectifier. A transformer 1 having a star connection and a transformer 2 on the other side are provided, and a rectifier 13 is connected to each phase of the transformers 1 and 2. The 6-phase rectifier is designed to output a direct current between the neutral points 01 and 02 of the transformers 1 and 2, and is integrated in a container (not shown) filled with a refrigerant such as insulating oil. It is stored in. here,
The DC output circuit includes terminals 5A and 5B such as bushings.
Is connected to the load 6 via. An interphase reactor 7 is provided on the transformer neutral point side of the DC output circuit. A connection wire 10 connecting the neutral point 01 of one transformer 1 and the terminal 5A of one transformer 1 penetrates through the window 8A of the reactor iron core 8 forming the closed magnetic circuit of the interphase reactor 7, and the other transformer. 2 neutral point 02 and one terminal 5A
The connection line 11 that connects with is also the direction of current flow with the previous connection line 10.
Reactor iron core 8 so that (direction of arrow 15) is reversed
Through the window 8A.

In FIG. 4, a connecting wire 10 forming a winding in one direction and a connecting wire 11 forming another winding wound in the opposite direction are present on the outer circumference of the reactor iron core 8. Therefore, the alternating currents flowing through both connection lines 10 and 11 are blocked, respectively, and the circulating current is blocked in the end. On the other hand, the rectified DC output current flows without being limited, and when the DC output current values of both are equal, the magnetic fluxes excited in the reactor core 8 cancel each other out to zero. In this way, the interphase reactor 7 has two transformers 1, 2
Has the role of preventing the circulating current from flowing between the phases.

However, when the DC output currents of both are out of balance and either current increases, a magnetic flux in the direction corresponding to the current flows in the reactor iron core 8. If the value is large, the reactor iron core 8 will have a large magnetic flux. The magnetic flux is saturated. As a result, the current limiting function of the AC component is lost and the interphase circulating current cannot be blocked. In order to eliminate such a defect, a non-magnetic void 14 is provided in the reactor iron core 8 as shown in FIG. 4 (for example, Japanese Utility Model Laid-Open No. 63-4839).
No. 1). If a void 14 is provided in the reactor core 8,
Since the current value until the magnetic flux is saturated becomes large, even if the balance of the DC output current value is slightly disturbed, the AC current limiting function is not lost. Therefore, the void 1 is formed in the interphase reactor 7.
If 4 is provided, the interphase circulating current can be surely blocked.

FIG. 5 is a circuit connection diagram showing a configuration example of a 12-phase rectifier. Equipped with four star-shaped transformers 1 to 4,
A rectifier 13 is connected to each of the transformers 1 to 4. The wiring of the transformers 1 and 2 is the same as that of FIG. The connection of the transformers 3 and 4 is the same as that of the transformers 1 and 2,
It is connected to the load 16 via terminals 16A and 16B. A two-story interphase reactor 17 is provided on the transformer neutral point side of the DC output circuit. Phase Reactor 17
Is equipped with a reactor core 9 with an intermediate yoke 18 interposed,
Two windows 9A and 9B are formed. Connection lines 10 and 11 penetrate the window 9A, and connection lines 20 and 21 penetrate the window 9B. Connection lines 10 and 11 and connection line 2
Similarly to FIG. 4, 0 and 21 penetrate through the windows 9A and 9B of the reactor core 9 so that the current flow directions (arrows 15 and 22) are opposite. Phase Reactor 17
Can be made up of two single-story reactors, but it can be made compact by inserting the intermediate yoke 18. Also in this case, the interphase circulating current can be blocked by providing the voids 23A and 23B on the upper and lower sides.

FIG. 6 is an exploded perspective view showing a structural example of a conventional reactor iron core. Main legs 30A, 30B parallel to each other
Yokes 31A and 31B that magnetically join the ends of the two are sandwiched by the sandwiching frames 32A and 32B. At the joint between the yoke 31A and the main legs 30A, 30B, a gap 14 secured by a non-magnetic gap material such as an insulator is interposed. The holding frames 32A and 32B have four connecting bolts 3
3 main gears 30A, 30B and yokes 31A, 31
Tighten B firmly. By this tightening, minute vibration of the iron core caused by magnetic attraction is suppressed, and noise is prevented. The configuration of FIG. 6 is, for example, as shown in FIG.
It is used as an iron core of the interphase reactor 7.

FIG. 7 is an exploded perspective view showing a different configuration example of a conventional reactor iron core. Main legs 34A parallel to each other,
Yokes 35A and 35B are arranged at the upper and lower ends of 34B, and an intermediate yoke 18 is interposed between the main legs 34A and 34B. Further, voids 23A and 23B are provided at the upper and lower ends of the main legs 34A and 34B, respectively.
The yokes 35A and 35B are sandwiched by A and 37B. The holding frames 37A and 37B are four connecting bolts 3
8 firmly tightens the iron core. The structure of FIG. 7 is used as an iron core of the two-story interphase reactor 17 of FIG. 5, for example.

[0008]

However, the conventional device as described above has a problem in that the sandwiching frame for preventing the noise generation of the iron core becomes large in size. In order to prevent the noise of the iron core, it is necessary to reduce the vertical vibration of the iron core generated in the void portion of the reactor iron core. for that reason,
The sandwiching frame is firmly tightened via the connecting bolt. Due to the necessity to secure the mechanical strength, the weight and the thickness increase, and the holding frame tends to be large in size.

An object of the present invention is to make a sandwiching frame compact by fitting a joint portion between a main leg and a yoke to each other so as to fit each other.

[0010]

In order to achieve the above object, according to the present invention, main legs parallel to each other, and a yoke for magnetically joining the axial ends of the main legs to each other are provided. It consists of two clamping frames respectively provided in contact with the side surface of the yoke that is on the side opposite to the main leg, and the clamping frames are clamped and fixed to each other via connecting bolts. In a part or all of which is provided with a void, both of the protrusions formed by notching the axial ends of the main leg and the yoke, in which the joint between the main leg and the yoke inserted in the void are formed. It is assumed that the main leg and the yoke are fixed to each other via a tightening bolt that penetrates both of the protrusions.

[0011]

According to the structure of the present invention, the main leg and the yoke are cut out at their ends to form a protrusion on both ends, and both of the protrusions are fitted together through a gap. Tighten the tightening bolt through the fitting part. By this tightening, the vertical vibration of the iron core in the gap can be suppressed, and thus the mechanical load on the holding frame can be reduced. Therefore, the holding frame can be made smaller than the conventional one.

[0012]

EXAMPLES The present invention will be described below based on examples.
FIG. 1 is an exploded perspective view showing a structure of a reactor core according to an embodiment of the present invention. By notching one end of the main legs 40A, 40B, a protrusion 40C is formed, and both ends of the yoke 41A are also notched protrusion 41C. The protrusions 40C and 41C are formed so as to be fitted to each other via a gap 51. Protrusion 40C, 41
A hole through which the tightening bolt 50 penetrates is provided in C, and the tightening bolt 50 allows the yoke 41A and the main legs 40A, 40B to pass through.
And are tightened. Since the other structure is the same as that of FIG. 6, the same portions are denoted by the same reference numerals and detailed description thereof will be omitted. Since it is tightened by the tightening bolts 50, the vertical vibration of the iron core in the gap 51 is suppressed, and the mechanical load on the holding frames 32A, 32B is reduced. When the thickness of the main legs 40A, 40B (thickness in the tightening direction of the tightening bolt 50) is large, a plurality of protrusions 40C may be provided in the thickness direction to further increase the number of inserts of the yoke 41A. In addition, one of the protruding portions of the yoke 41A is made to protrude in the center of the end portion thereof, and the main leg 40A, 4
A cutout portion may be provided at the center of the end portion of 0B so as to be fitted to each other.

FIG. 2 is an exploded perspective view showing the structure of a reactor core according to another embodiment of the present invention. Main leg 43
A protrusion 43C is formed by notching the ends of A and 43B on only one side, and the protrusion 42 is formed so that both ends of the yoke 42A also fit into the notches of the main legs 43A and 43B.
Form C. The protrusions 43C, 42C are fitted together through the gap 52, and the yoke 42A and the main legs 43A, 43B are inserted through the tightening bolts 50 penetrating the protrusions 43C, 42C.
Is tightened. The other structure is the same as that of FIG. Since it is tightened by the tightening bolt 50 as in the configuration of FIG. 1, the vertical vibration of the iron core in the gap 52 is suppressed, and the mechanical load on the holding frames 32A, 32B is reduced. Therefore, the holding frame can be made smaller than the conventional one.

FIG. 3 is an exploded perspective view showing the structure of a reactor core according to a further different embodiment of the present invention. The protrusions 64C are formed by cutting out the ends of the main legs 64A, 64B, and the upper and lower yokes 61A, 61B are formed.
Both ends of each are also formed with protrusions 61C so as to fit into the notches of the main legs 64A and 64B. The protrusions 61C, 64C are fitted together through the gap 66, and the yokes 61A, 61B are inserted through the tightening bolts 60 penetrating the protrusions 61C, 64C.
And the main legs 64A and 64B are fastened. The other structure is the same as that of FIG. 7. Since it is tightened by the tightening bolts 60 as in the configuration of FIG. 1, the vertical vibration of the iron core in the space 66 is suppressed, and the mechanical load on the holding frames 37A, 37B is reduced. Therefore, the holding frame can be made smaller than the conventional one.

[0015]

As described above, according to the present invention, the main leg and the yoke are notched in the ends to form protrusions on both ends, and both the protrusions are fitted to each other through a gap. Tighten the tightening bolt through the fitting part. By this tightening, the vertical vibration of the iron core in the gap can be suppressed, and thus the mechanical load on the holding frame can be reduced. Therefore, the holding frame can be made smaller than the conventional one, and the weight and cost of the device can be reduced. Further, since the thickness of the holding frame (thickness in the tightening direction of the connecting bolt) is also reduced, there is an advantage that the height of the device is reduced.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a structure of a reactor core according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing the structure of a reactor core according to another embodiment of the present invention.

FIG. 3 is an exploded perspective view showing a structure of a reactor core according to still another embodiment of the present invention.

FIG. 4 is a circuit connection diagram showing a configuration example of a 6-phase rectifier.

FIG. 5 is a circuit connection diagram showing a configuration example of a 12-phase rectifier.

FIG. 6 is an exploded perspective view showing a configuration example of a conventional reactor iron core.

FIG. 7 is an exploded perspective view showing a different configuration example of a conventional reactor iron core.

[Explanation of symbols]

 31B Yoke 41A Yoke 42A Yoke 61A Yoke 61B Yoke 18 Intermediate Yoke 40A Main leg 40B Main leg 43A Main leg 43B Main leg 64A Main leg 64B Main leg 32A Clamping frame 32B Clamping frame 37A Clamping frame 37B Clamping frame 33 Connecting Bolt 38 Connecting Bolt 50 Tightening Bolt 60 Tightening Bolt 51 Gap 52 Gap 66 Gap 40C Projection 41C Projection 42C Projection 43C Projection 61C Projection 64C Projection

Claims (1)

[Claims] 1. A main leg parallel to each other, a yoke for magnetically joining the axial ends of the main leg, and two pieces provided respectively in contact with the side face of the yoke opposite to the main leg. The holding frame is clamped and fixed to each other via connecting bolts, and a gap is provided in a part or all of the joint between the main leg and the yoke. The joint between the main leg and the yoke is formed by fitting the protrusions of the main leg and the yoke formed by cutting out the axial ends of the main leg and the yoke, and a tightening bolt that penetrates both of the protrusions. A reactor iron core characterized in that the main leg and the yoke are fixed to each other via the.