JP5686440B2 - Laminated iron core for static induction - Google Patents

Description

  The present invention relates to a laminated iron core for static induction appliances such as a transformer and a reactor, and more particularly to a laminated iron core for stationary induction electric appliances laminated by combining a silicon steel plate and an amorphous alloy ribbon.

  Usually, a static induction electric appliance such as a transformer or a reactor uses an iron core in which silicon steel plates cut into strips are laminated. On the other hand, in recent small capacity static induction appliances, an amorphous alloy ribbon having low magnetic loss and excellent magnetic properties is used to manufacture and use a wound core. . A wound iron core using an amorphous alloy ribbon has a structure that is cut every turn, and is connected to the winding end and end of winding of the amorphous alloy ribbon every turn. It has.

  Since a general amorphous alloy ribbon is manufactured with a thickness of 20 or 30 μm, it is about 1/10 the thickness of a silicon steel sheet used for an iron core. For this reason, the amorphous alloy ribbon has a predetermined number of laminated sheets cut to the same length as one unit, and is about the thickness of one silicon steel sheet. The unit is wound to form a wound iron core.

  In the case of a wound iron core made of an amorphous alloy ribbon, in the case of a static induction electric device, for example, a transformer, the jig supporting the iron core becomes larger as the capacity increases, and the winding of the amorphous alloy ribbon is increased. Since the joint between the start end and the end of winding is provided at the top, it is difficult to stand up without applying local stress to the amorphous alloy ribbon during manufacture. For these reasons, the production of a large-capacity transformer using an amorphous alloy ribbon is inferior in workability.

  Conventionally, laminated iron cores using amorphous alloy ribbons in place of silicon steel sheets have been proposed in Patent Documents 1 and 2, for example. In Patent Document 1, a plurality of strip-shaped amorphous alloy ribbons are superposed so that the smooth surfaces do not face each other and an insulating treatment agent is attached, and then the amorphous alloy ribbons are arranged in the thickness direction. This is heated after pressing to form a coating film of an insulating treatment agent between the surface of the amorphous alloy ribbon and the lamination, and further a strain relief annealing process is performed to create a laminated block. To produce a laminated iron core. Further, in Patent Document 2, when a stainless steel plate that has good corrosion resistance and does not require rust prevention treatment is used as an iron core material, an amorphous alloy ribbon is inserted for every several stainless steel plates, and an electromagnetic iron core is inserted. Is described.

JP-A-61-71612 Japanese Patent Laid-Open No. 62-14406

  However, since the laminated iron core described in Patent Document 1 is combined after performing the strain relief annealing of the laminated block, local stress is applied to the laminated block during the laminating work, and micro cracks are generated and develop into fracture. There is a fear. Single-phase transformers that use U-shaped iron cores combined with laminated blocks are constructed as a single unit by inserting the laminated block from the top after mounting the windings on the iron core legs. There is a possibility that a minute crack is generated by applying stress, and a piece of amorphous alloy ribbon generated by this crack enters the winding, and the reliability of the transformer is significantly lowered.

  In addition, the amorphous alloy ribbon used for the laminated iron core has a saturation magnetic flux density of 1.56-1.61 T, which is lower than the saturation magnetic flux density of 2.00 T of a generally used silicon steel sheet. There is a problem that the core leg around which the wire is wound becomes large and the transformer becomes large.

  Further, the electromagnetic iron core described in Patent Document 2 inserts one piece of amorphous alloy ribbon for every several pieces of stainless steel plate core material, so that the assembly work is very difficult and economical at the joint. Can no longer be produced. In addition, since a nonmagnetic stainless steel plate is used, the effective cross-sectional area of the electromagnetic iron core is reduced, so that the cross-sectional area of the electromagnetic iron core must be increased to obtain a predetermined magnetic flux density. Moreover, the structure using the stainless steel plate and the amorphous alloy ribbon having a low saturation magnetic flux density also has a problem that the size of the transformer is increased because the iron core legs are similarly increased.

  An object of the present invention is to provide a laminated core for a static induction electric appliance that can reduce the loss in the upper and lower yokes and can be miniaturized.

  When the laminated iron core for a static induction electric machine according to the present invention is composed of at least two or more iron core legs for winding a winding, and upper and lower yokes that magnetically couple between the iron core legs, The core legs are formed by laminating silicon steel plates, and the upper and lower yokes are formed by laminating using a laminate unit in which a predetermined number of amorphous alloy ribbons are laminated. And between lower yokes, it is characterized by comprising as a lamination | stacking junction part which laminated | stacked the silicon steel plate and the amorphous alloy ribbon laminated body unit alternately.

  Preferably, the iron core legs and the upper and lower yokes are formed by applying an insulating treatment agent to a laminated end surface of a silicon steel plate or an amorphous alloy ribbon.

  If a laminated core for a static induction appliance is constructed as in the present invention, each core leg is formed by laminating silicon steel plates, and the upper and lower yokes are laminated with a predetermined number of amorphous alloy ribbons. Since the unit is laminated, the loss in the upper and lower yokes can be reduced. Compared to the laminated core in which each core leg and upper and lower yokes are all made of amorphous alloy ribbons. This makes it possible to reduce the size of static induction devices.

It is a front view which shows the laminated iron core for static induction appliances which is one Example of this invention. It is a front view which shows the laminated iron core for static induction appliances which is another Example of this invention. (A) And (b) is a front view which shows the lamination | stacking unit which comprises the laminated iron core for static induction appliances of FIG. 2, respectively. It is explanatory drawing of the assembly state of the static induction appliance using the laminated iron core of FIG. It is a front view which shows the laminated iron core for static induction appliances of the three-phase three-leg which is another Example of this invention. It is a front view which shows the laminated iron core for static induction machines of the three-phase 5 leg | leg which is the other Example of this invention.

  The laminated iron core for a static induction electric machine according to the present invention is composed of at least two or more iron core legs around which a winding is wound, and upper and lower yokes that magnetically couple the iron core legs. Each iron core leg is formed by laminating silicon steel plates, and the upper and lower yokes are formed by laminating using a laminate unit in which a predetermined number of amorphous alloy ribbons are laminated. Between each iron core leg and the upper and lower yokes, a laminated joint is formed by alternately laminating silicon steel plates and laminate units of amorphous alloy ribbons. Hereinafter, the laminated iron core for static induction appliances of this invention is demonstrated in order using the laminated iron core for transformers shown in FIGS.

  A single-phase two-leg transformer laminated iron core 10 shown in FIG. 1 to which the present invention is applied includes two iron core legs 11 and 12, and an upper yoke 13 and a lower yoke that magnetically couple the iron core legs 11 and 12. The iron 14 constitutes a closed magnetic circuit. The core legs 11 and 12 are formed by laminating silicon steel plates cut into strips. The upper and lower yokes 13 and 14 are formed by laminating amorphous alloy ribbons cut into strips as will be described later.

  Since the thickness of a general silicon steel plate is 300 μm or 350 μm, the thickness of the upper yoke 13 and the lower yoke 14 is 25 μm for one silicon steel plate forming the core legs 11 and 12. A certain number of amorphous alloy ribbons are laminated into a single unit by stacking a predetermined number of sheets, and for example, a combination of 12 to 14 sheets is used as a stack unit.

  In the transformer laminated core 10 of FIG. 1, the four corner joints between the core legs 11 and 12 and the upper yoke 13 and the lower yoke 14 are composed of a laminated body unit of a silicon steel plate and an amorphous alloy ribbon. As shown by a solid line and a broken line, a structure of the laminated joint portion 15 that is alternately overlapped is formed. Thereby, even when the transformer laminated iron core 10 is erected, the transformer can be held so as not to be deformed by the surface pressure of the laminated junction 15.

  In the transformer laminated core 10 of the present invention described above, the core legs 11 and 12 around which windings (not shown) are wound are formed of a silicon copper plate having a saturation magnetic flux density higher than that of the amorphous alloy ribbon. ing. For this reason, the cross-sectional area of the core leg is smaller than that of a laminated core using an amorphous alloy ribbon for the core leg as in the prior art. Can be manufactured economically. In addition, since the amorphous alloy ribbon has a low loss of 0.016 to 0 · 101 (W / kg), the loss in the upper yoke 13 and the lower yoke 14 formed by using this is reduced. be able to.

  Further, a single-phase two-leg transformer laminated iron core 20 to which the present invention shown in FIG. 2 is applied has two iron core legs 21 and 22 formed by laminating silicon steel plates in the same manner as described above, and amorphous. A closed magnetic circuit is constituted by an upper yoke 23 and a lower yoke 24 formed by laminating laminate units of alloy ribbons. In addition, the four corner joints between the core legs 21 and 22 and the upper and lower yokes 23 and 24 are diagonally overlapped with each other at approximately 45 degrees, as indicated by solid lines and broken lines. The structure of the laminated joint portion 25 is as follows.

  The transformer laminated core 20 is formed by laminating two types of laminated units shown in FIGS. 3 (a) and 3 (b). That is, as shown in FIG. 3A, the silicon steel plates 21A and 22A used for forming the iron core legs 21 and 22 and the amorphous alloy unitized as a laminate used for forming the upper and lower yokes 23 and 24. The thin ribbons 23A and 24A are both arranged so as to be obliquely joined at both ends to form a so-called frame-like joint, thereby forming a first-layer laminated unit 20A in which the joint surfaces are shifted in the clockwise direction.

  Further, as shown in FIG. 3 (b), silicon steel plates 21B and 22B used for forming the iron core legs 21 and 22, and amorphous alloys in units of laminates used for forming the upper and lower yokes 23 and 24. The thin ribbons 23B and 24B form a second layer stack unit 20B in which the joint surfaces are shifted in the counterclockwise direction. Then, the odd-numbered layer and even-numbered layer stack units 20A and 20B are alternately stacked to constitute the transformer transformer laminated core 10 having the structure of the oblique laminated junction 25 shown in FIG.

  The transformer laminated iron core 20 is subjected to strain relief annealing in a non-oxidizing atmosphere at a temperature of about 400 ° C. and 10 minutes to 2 hours in a laminated flat state or standing state. Eliminates distortions in the crystalline alloy ribbon to improve iron loss and magnetic properties. Then, after the strain relief annealing is completed, iron core plates (not shown) are provided on the iron core legs 21 and 22 so that local stress is not applied even if the stand is erected, and iron core fasteners (not shown) are provided on the upper and lower yokes 23 and 24. (Not shown) is provided, and then the entire transformer laminated iron core 20 is erected.

  Thereafter, as shown in FIG. 4, the silicon steel plates 23A and 23B forming the upper yoke 23 are removed, the windings 26 and 27 are wound around the U-shaped iron core legs 21 and 22, and the silicon steel plates 23A and 23B again. The upper yoke 23 having the laminated joint portion 25 is formed by performing the ironing operation to constitute the transformer main body.

  When inserting the amorphous alloy ribbon forming the upper yoke 3 after winding the windings 26 and 27 around the U-shaped iron core legs 21 and 22, as described above, the iron core A single amorphous steel sheet forming the legs 21 and 22 is formed by laminating a predetermined number of amorphous alloy ribbons, and they are laminated and integrated so that their thicknesses are equal. In addition, when inserting an amorphous alloy ribbon, measures are taken to prevent the fragments from falling into the winding so as not to impair the reliability of the transformer.

  The transformer laminated iron core 20 shown in FIG. 2 can achieve the same effect as that of FIG. 1 and has the structure of the oblique laminated joint 25, so that it can be compared with the laminated joint 15 of FIG. Since the loss generation area is small, the loss can be reduced.

  FIG. 5 shows the contents of a transformer using a three-phase three-leg transformer laminated core 30 to which the present invention is applied. This transformer laminated iron core 30 is formed by laminating silicon steel plates in the same manner as in the above example, and three iron core legs 31, 32, 33 for winding the windings 36, 37, 38, and an amorphous alloy. This is a three-phase three-legged structure in which a closed magnetic circuit is formed by an upper yoke 34 and a lower yoke 35 formed by laminating thin ribbon units. And the joining of each part between the iron core legs 31, 32, 33 and the upper and lower yokes 33, 34 of the transformer laminated iron core 30 is composed of a silicon steel plate and a laminated unit of an amorphous alloy ribbon with a solid line and a broken line. As shown in FIG. 6, the loss is reduced by adopting the structure of the oblique laminated joint portions 39 alternately overlapping at approximately 45 degrees.

  In this transformer laminated core 30, the three steel core legs 31, 32, and 33 around which the windings 36, 37, and 38 are wound are silicon steel plates having a higher saturation magnetic flux density than the laminated unit of amorphous alloy ribbons. Therefore, the diameter of the iron core leg is not increased, and the transformer body can be reduced in size as compared with the conventional structure in which the entire laminated iron core is made of an amorphous alloy ribbon. Further, since the three iron core legs 31, 32, 33 for winding the windings 36, 37, 38 are made of silicon steel plates having higher rigidity than the amorphous alloy ribbon, the transformer capacity is increased. Even if the size is increased, the transformer core can be firmly supported.

  The laminated joint 39 of the central core leg 32, the upper yoke 34, and the lower yoke 35 has a λ shape, but the core leg 32, the upper yoke 34, and the lower yoke 35 are reversed left and right. By laminating the layers, the laminated joint portion 39 can be formed into an X shape. The loss can be reduced to the same extent in any of the λ-shaped and X-shaped laminated joints 39.

  FIG. 6 shows the contents of a transformer using a three-phase five-leg transformer core 40 to which the present invention is applied. This transformer laminated iron core 40 is formed by laminating silicon steel plates and winding three winding core legs 41, 42, 43 around which windings 46, 47, 48 are wound, and by laminating silicon steel plates. Left and right side legs 50 and 51, and an upper yoke 44 and a lower yoke 45 formed by laminating a laminate unit of amorphous alloy ribbons, and obliquely overlapping each other at approximately 45 degrees. This is a three-phase five-legged structure in which a closed magnetic circuit is formed by the laminated junction 49.

  In this transformer laminated core 40, even if the side legs 50 and 51 are increased, a silicon steel plate having a higher saturation magnetic flux density than that of the amorphous alloy ribbon is used, so that the cross-sectional area of each core leg does not increase. The transformer can be miniaturized. Since the joining region of the laminated joint portion 49 of the iron core legs 41, 42, 43 and the upper yoke 44 and the lower yoke 45 hardly changes the laminated iron core of the single-phase two-legged and three-phase three-legged, it is large. Loss in the capacity transformer can be reduced in the same manner as described above. If the side legs 50 and 51 are formed by laminating a laminated unit of amorphous alloy ribbons in place of the lossy silicon steel plate, the loss can be further reduced.

  In addition, in the transformer laminated iron core of each embodiment of the present invention, the lamination of the laminated steel unit of the silicon steel plate of each iron core leg before winding the winding and the amorphous alloy ribbon forming the lower yoke After winding the end face and the winding, an insulating treatment agent such as varnish can be applied to the laminated end face of the upper yoke. When the insulating treatment agent is applied in this manner, the resistance between the layers can be increased, and the reliability of the transformer can be improved by hardening the damaged portion of the amorphous alloy ribbon.

  In each of the above-described embodiments, the present invention has been described with respect to the example of the single-phase two-legged and three-phase three-legged or three-phase five-leg transformer laminated core, but the present invention can also be applied to a single-phase three-legged or reactor. A similar effect can be achieved.

10, 20, 30, 40 ... laminated iron core for stationary induction machine, 11, 12, 21, 22, 23, 31, 32, 33, 41, 42, 43 ... iron core leg, 20A, 20B ... laminated unit, 21A, 22A 21B, 22B ... Silicone steel plate, 23A, 23B, 24A, 24B ... Amorphous alloy ribbon, 13,23,34,44 ... Upper yoke, 14, 24,35,45 ... Lower yoke, 15, 25, 39, 49...

Claims (2)

And at least two core legs winding a wire made of an upper and a lower yoke magnetically coupling between the core leg, each core leg is formed by laminating silicon steel plates, the upper And the lower yoke is formed by laminating using a laminate unit in which a predetermined number of amorphous alloy ribbons are laminated, and between each iron core leg and the upper and lower yokes, a silicon steel plate and amorphous in quiescent induction apparatus for laminated core configured as a laminated joint laminating the alloy strip laminate units alternately,
Each of the iron core legs and the upper and lower yokes are formed in a shape in which both ends are obliquely cut to form a so-called frame-shaped joint, and the laminated joint has a joint surface in a clockwise direction for each layer. A laminated iron core for static induction appliances, wherein the laminated iron core is formed by being shifted in a counterclockwise direction . 2. The laminated core for a static induction machine according to claim 1, wherein each of the iron core legs and the upper and lower yokes form corners having both ends cut obliquely at approximately 45 degrees .

Images