JPS62128510A - Manufacturing method of wound core for induction electric appliances - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a method for manufacturing a wound core for induction electric appliances such as transformers and reactors, which is made of a ribbon of an amorphous magnetic alloy.

[Technical field to which the invention pertains]

Amorphous magnetic materials have the excellent properties of significantly lower iron loss and excitation current than conventional grain-oriented silicon steel sheets, so development of wound cores for induction electric appliances that take advantage of these properties is actively underway. There is. Currently, thin strips of amorphous magnetic alloy used in cores for induction appliances can only be obtained with a thickness of about 40 μfrL, so it is common practice to wind the thin strips to form a wound core. However, since the magnetic properties of the ribbon are extremely sensitive to mechanical strain, the temperature at 370 to 400°C is required to remove the processing strain from the wound core after winding. Because the ribbon is extremely brittle after annealing, extreme care and protective measures must be taken to prevent damage to the core during winding and installation into transformers. Requires.

Fig. 3 is a cross-sectional view of a rectangular ring-shaped wound iron core in a hand-made state with the /la field in the same direction for explaining an example of a conventional manufacturing method, and Fig. 4 is a sectional view of a wound iron core in a handmade state in a completed state in a direction perpendicular to the magnetic field of the legs. FIG. In the figure, reference numeral 1 denotes a wound core made by winding thin strips of amorphous magnetic alloy using a winding frame corresponding to a substantially rectangular core window 2. A plurality of wound layer blocks are formed by winding a thin strip of width WB to a predetermined thickness to form a wound layer block IB. The corners of IA, IB, IC, LD, and Ig are formed into a rectangular ring shape with a stepped cross section so that the corners thereof are located approximately on one circumscribed circle. As shown in FIG. 3, a heat-resistant temporary binding layer 3 made of glass tape or the like is adhered to the outer circumferential surface of the straight portion of the wound core 1 after the winding operation, and a coil for magnetic field annealing is further applied to the outside thereof. 4 is wound around the coil 4, and a DC current of a predetermined current value is passed through the coil 4.
The tapping annealing treatment is performed in an inert gas atmosphere at ℃ to remove the mechanical strain caused by the winding process and the resulting deterioration in magnetic performance. After the magnetic field annealing process has been completed, the thin plates of the wound core are hardened and the rigidity increases to a certain extent, so the coil 4 and the temporary binding layer are removed, and as shown in FIG.

An induction electric appliance in which a spacer piece 5 made of an insulating material such as 5B, 5C, 5D, etc. is arranged and the outer peripheral surface is shaped into a substantially circular shape, and shape stability is imparted by binding the outside with a binding tape 1-6. A wound core is obtained, and inexpensive materials such as synthetic resin moldings can be used for the spacer pieces.

The wound core formed as described above has circular legs, so a cylindrical winding frame is provided in this part, and the winding operation is performed while rotating this winding frame. As well as being able to move the work around.

The gap between the winding core and the winding frame is small, so that it is possible to obtain a compact induction electric appliance. However, since shaping is performed after magnetic field annealing, processing distortion remains, as shown in Figure 4. When compared with that of the core with the shape shown in Figure 3 immediately after magnetic field annealing, it is found that the properties have significantly deteriorated due to shaping and winding, and the thin strips at the corners of the winding block have been damaged, resulting in amorphous A problem has arisen in which the effects of using magnetic alloys are not utilized, and an improvement is required.

[Purpose of the invention]

The present invention was made in response to the above-mentioned situation, and it is possible to remove most of the processing strain by magnetic field annealing treatment, to reduce the deterioration of properties after annealing treatment, and to use a ribbon of amorphous magnetic alloy. The purpose of the present invention is to provide a method for manufacturing a wound core for induction electric appliances that can sufficiently exhibit low loss and low excitation current performance.

[Key points of the invention]

In the method of the present invention, a silicon steel strip equivalent to approximately one turn is inserted between the layers at the boundary of each wound layer block and on the innermost and outermost peripheries of the wound core during the winding process of the ribbon. The steel strip functions as an aggregate to provide mechanical reinforcement, and the spacer pieces and binding tape are made of heat-resistant insulating material that can withstand magnetic field annealing to perform the final shaping of the wound core before magnetic field annealing. As a result, the shaping strain of the wound core can be reduced due to the improvement effect of the silicon steel strip, and most of the shaping strain, including shaping strain, can be removed by magnetic field annealing treatment, resulting in low loss and low A wound core with excellent excitation current performance is obtained, and even in the winding process after magnetic field annealing, the reinforcing effect of the silicon steel strip prevents the winding core from forming type 7, thereby preventing deterioration in magnetic performance. It is something.

[Embodiments of the invention]

The present invention will be explained below based on examples.

FIG. 1 is a sectional view taken along the direction of the magnetic field of a wound core showing an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of the leg in the direction perpendicular to the magnetic field. In the figure, a thin strip of amorphous magnetic alloy is wound to form a wound layer block IA.

During the process of sequentially winding IB, IC, ID, and IE to form a wound core l, a silicon steel strip 11B having a width approximately equal to that of the ribbon is placed between the turns at the boundary of each layer block.
A process is provided in which silicon steel strips 11A and liF are wound into the IIC, LID, and IIE at the beginning and end of the thin strip, respectively, by an amount equivalent to one winding, and the rigidity of the silicon steel strip 11 is utilized to form a wound core. 1 to enhance the form stability and prevent damage to the ribbons at the corners of each winding block.

The silicon steel body 1] is shaped in advance into two U-shaped parts to match the shape and dimensions of the intervening part, and then rolled between the windings of the wound core so that the abutting parts 13 of the two overlap each other. This makes it possible to form a wound core with good shape stability without imparting strain to the ribbon. The wound core 1 reinforced by the silicon steel strip 1 is removed from the winding frame, and the legs of the wound core are removed.

Heat-resistant spacing piece 15A is installed on the linear stepped portion of the yoke.

15B, 15c, and 15D are installed, and the final shaping process is performed by wrapping heat-resistant tape such as glass tape around the outside to form the bonding layer 16. However, both sides of each wound layer block are protected by silicon steel strips. Since it is possible to prevent damage caused by scratches and to equalize the pressing force applied to the laminated surfaces, it is possible to form a wound core with less processing strain.

Note that the spacing piece 15 and the binding layer 16 must have heat resistance to the extent that they will not be deformed, cracked, or significantly reduced in mechanical strength during the subsequent magnetic field annealing treatment. By using glass tape for bondage/-16 and shaped silicone glass layer material for spacing piece 15, the bonding layer and spacing piece can withstand magnetic field softening at 370 to 400°C for one to several hours. can be obtained. In addition to the above, the spacing pieces may be made of a non-porous molded material such as porcelain. After completing the final distortion processing as described above, the wound core is wound with a coil for magnetic field annealing on the outside of the binding layer 16, and a DC magnetic field with a predetermined magnetic flux density is applied to the wound core in the winding direction of the ribbon. Magnetic field annealing treatment is performed in a state where the magnetic field is generated.

By configuring the method for manufacturing the wound core as described above,
After the thin strip winding process has been completed, the rolled iron core has increased rigidity and shape stability due to the interposition of the silicone strip, so it is easy to remove it from the winding frame and perform the shaping process of attaching spacing pieces and applying a binding layer. The structure minimizes processing strain applied to the wound core, and the initial shaping process can be performed using heat-resistant spacing pieces and heat-resistant binding tape before the hot-water annealing process, which eliminates all processing including shaping process strain. Since strain can be removed by magnetic field annealing, it is possible to obtain a wound core with low loss and low excitation current that fully takes advantage of the excellent magnetic properties of the amorphous magnetic alloy ribbon. In addition, after the annealing treatment, the hardening of the thin ribbon, the reinforcing effect of the silicon steel strip, the protective effect of the 1-space piece, and the protective effect of the binding layer work in a complementary manner, improving the shape stability of the wound core, and improving the shape stability of the wound core. Since it is shaped into a circular shape, it is possible to suppress the processing strain applied to the winding core during winding millet, making it ideal for not only winding processing but also transporting the core and assembling a visiting conductor. Deterioration in magnetic performance due to processing can also be reduced. Based on the experience of the inventors, the loss of a transformer using a wound core manufactured by the manufacturing method of the present invention is 3.
The magnetic flux and excitation current were between 30% and 30% lower than those of the transformer using the iron core manufactured by the conventional technique, demonstrating that the magnetic performance was significantly improved.

〔Effect of the invention〕

As described above, the present invention involves winding silicon steel strips around important points between the windings or around the inner and outer peripheries during the process of forming a rectangular ring-shaped core formed by winding thin strips of amorphous magnetic alloy. In addition to reinforcing the wound core, heat-resistant spacing pieces and heat-resistant binding tape were used to complete the shaping process before magnetic field annealing.

As a result, by inserting the silicon steel strip, shaping distortion was reduced, and the final y! By performing magnetic field annealing treatment after L-shape processing, most of the processing strain is removed, eliminating the deterioration in magnetic performance due to shaping processing strain that was a problem in conventional technology, and resulting in low loss and
It is possible to provide a manufacturing method that can easily and stably obtain a wound core for a conductor having low excitation current characteristics. Also,
By shaping the cross section of the wound iron core into a circular shape and placing silicon steel strips at the stepped corners to prevent damage to the ribbon and increase the rigidity of the wound iron, it is possible to prevent the iron from becoming brittle due to magnetic field annealing. Winding work can be done efficiently without damaging the winding core, and it is also suitable for winding processing.

By being able to withstand the stress applied to the wound core during the transportation and assembly work and maintain its shape stability, the iron loss and excitation electric strength of the transformer obtained by the manufacturing method of the present invention can be improved.

21 compared to that of a transformer using an iron core according to the conventional technology.
) or % reduction, thus contributing to energy saving keys such as lower loss of conductor generator and lower excitation current.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the wound core along the magnetic field direction showing the method according to the embodiment of the present invention, FIG. A sectional view of a handmade state showing an example, FIG. 4 is a B10 in a conventional method.
) is a sectional view of the completed state. 1...Wound core, IA, IB, IC, ID, IE...
Winding layer block, 2.12... Iron core window portion, 3... Temporary bonding layer, 5... Interlocking piece, 6... Bonding layer, 11. l]A
, 11B...IIF... silicon steel strip, 15, 15
A, 15B, 15C, 151)...Heat-resistant injected chewing piece, 16...ttsayoJ'+horometsukaisei. Otsu' First #Rijo Yamaguchi A11. Pa'1゛(4 years old)

Claims (1)

[Claims] 1) A plurality of wound layer blocks formed by winding a thin ribbon of an amorphous magnetic alloy a predetermined number of times are wound in layers with the width of the thin ribbon being changed for each block, and the corners of each wound layer block are approximately A method for manufacturing a wound core having a substantially rectangular ring shape and having a stepped cross section formed to be located on one circumscribed circle, wherein a predetermined width is provided between the windings at the beginning and end of the ribbon and between the winding layer blocks. After winding the silicon steel strip of A method for producing a wound iron core for an induction electric appliance, which comprises performing a magnetic field annealing treatment after completing a final shaping process in which a heat-resistant tape is wound around the core to form a binding layer. 2) In the method described in claim 1, the silicon steel strip is formed in advance into two U-shapes corresponding to the shape of the intervening portion, and the thin strips are formed so that the butt portions of the U-shapes overlap each other. A method for producing a wound core for an induction electric appliance, characterized in that the core is inserted between turns or at the beginning and end. 3) A wound core for an induction electric appliance according to claim 1, wherein the heat-resistant spacer is made of a heat-resistant insulating material that does not cause deformation, cracking, etc. during annealing of the wound core. Production method.