JPH07298570A - Manufacture of spiral core - Google Patents

Abstract

PURPOSE:To provide an iron core which shows an excellent magnetic characteristic in the vertical direction by making a spiral core of a long magnetic steel plates whose magnetic flux density in the direction of the width is a specific value and after that, annealing it so that the particle diameter becomes not less than a specific value and applying layer insulation treatment thereto and then bonding it. CONSTITUTION:A steel plate 4 obtained by cutting a oriented magnetic steel plate whose magnetic flux density in the direction of rolling is 1.92T at 800A/m in plural places of the axial direction 2b, is rotated by 90 deg. and welded in the part corresponding to the side edges before cutting to connect it together. The magnetization characteristic in the axial direction 2b of the obtained long magnetic steel plate is the magnetic flux density of 1.93T at 800A/m. A core 7 is one before spirally processed which is made by applying teeth work to the long magnetic plate 5, and the magnetization characteristic in the length direction 9 of teeth 8 shows similar magnetic flux density. After the spiral core work is applied to the core 7, it is annealed so that the particle diameter becomes not less than 1mm and the layers are not burned together. After adhesive coating is applied thereto, work treatment is performed to obtain a motor core 10 of final rotary type spiral core.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a spiral core suitable for use as a core of a rotary machine or a linear motor having a curved portion.

[0002]

2. Description of the Related Art Since iron cores of rotating machines such as motors are used by being excited in multiple directions, non-oriented electrical steel sheets are generally used. However, for small motors and the like, there is a strong demand for small size and high output, and an iron-cobalt alloy having a higher saturation magnetization than a silicon steel sheet has been studied as an iron core material. This iron-cobalt alloy is difficult to obtain in the form of a plate and is difficult to process, and since cobalt is used, there are many problems such as an increase in cost. For this reason, development of silicon steel plates having excellent magnetizing characteristics has been actively made with materials such as silicon steel plates. On the other hand, in a large-sized rotating machine, the directional silicon steel sheet is divided into several segments and the iron cores are combined so that the easy axis of magnetization of the directional silicon steel sheet is used in the main direction of excitation.

For a small motor or the like, it is preferable to use a motor having excellent magnetizing characteristics in the length direction of the teeth in order to achieve a small size and high output, and use of a grain-oriented silicon steel sheet is also under consideration. . On the other hand, in order to reduce the cost, in an alternator used in an automobile, a non-oriented silicon steel plate in which teeth are continuously punched is spirally wound to form an iron core.

Against this background, it is possible to manufacture an iron core having excellent magnetization characteristics in the length direction of the teeth portion by using electromagnetic steel sheets having excellent magnetization characteristics in the width direction by continuous processing or the like. Is being considered. However, when the iron core showing excellent magnetization characteristics in the lengthwise direction of the teeth portion is plastically deformed like a spiral core, the magnetic characteristics of the electromagnetic steel sheet deteriorate significantly, and the coating applied to the surface of the electromagnetic steel sheet. Also, since it peels off, there is a problem in characteristics.

[0005]

DISCLOSURE OF THE INVENTION The present invention uses an electromagnetic material such as a silicon steel plate and the like, and an iron core or a toothed member having an excellent magnetic characteristic in the longitudinal direction of the teeth portion of a rotating machine core or a linear motor core. If there is not, manufacture an iron core, etc. that exhibits very good magnetic characteristics in the direction perpendicular to the gap so that the magnetic flux from the core can easily flow into the gap between the movable and fixed parts of the rotating machine or linear motor. It was made for the purpose of providing a method.

[0006]

The features of the present invention include (1) a method for manufacturing a spiral core, which is characterized by performing annealing after processing into a spiral core, and (2) a grain size after annealing. (1) The method for producing a spiral core according to (1), characterized in that the thickness is 0.1 mm or more, and (3) the insulation treatment between layers is performed after processing into a spiral core. (4) The method for producing a spiral core according to (3), wherein the interlayer insulation treatment has an adhesive force.
(5) The method for producing a spiral core according to any one of (1) to (4), characterized in that a long magnetic steel sheet for spiral core having a magnetic flux density in the width direction of 800 A / m and 1.6 T or more is used. (6) A long magnetic steel sheet for a spiral core having a magnetic flux density in the width direction of 1.05 times or more at 800 A / m with respect to the magnetic flux density in the length direction is used (1) to (4) The method for manufacturing a spiral core according to any one of 1.

The present invention will be described in detail below. The grain-oriented electrical steel sheet of the present invention is a plate-shaped magnetic material such as a silicon steel sheet, a normal steel sheet, a material containing components other than iron, or an alloy made of other components, and is mainly rolled. The magnetic properties are excellent in the longitudinal direction, and the magnetic properties in the rolling direction are excellent in those manufactured by the rolling method.

Excellent magnetic characteristics means that the magnetic flux density is high with a constant direct current or an alternating magnetic field, or the magnetic field excited to a constant direct current or the alternating magnetic flux density is low, that is, the magnetic permeability is high and the magnetic field is constant. The alternating magnetic flux density of the amplitude indicates that the power loss is small, or that the coercive force is small or the magnetostriction is small. In the present invention, it is not necessary that all the magnetic properties described above are excellent, and one or more of them may be excellent depending on the purpose of use.

In the spiral core, it is preferable that the magnetic characteristics of the teeth portion and the magnetic characteristics in the direction perpendicular to the gap are excellent. For this purpose, it is preferable to use a coil or a long piece of electromagnetic steel plate having excellent magnetic characteristics in the width direction of the coil. For electromagnetic steel sheets with excellent magnetic properties in the width direction, manufacture of long-oriented electrical steel sheets and grain-oriented electrical steel sheet coils by cutting the product of grain-oriented electrical steel sheets and joining them so that the length of the cut pieces is the width. At any stage from cold rolling to finish annealing in the process, the coil is cut into a predetermined length, joined so that the length becomes a width, and then a long electromagnetic steel sheet subjected to subsequent process treatment. Can be obtained by It may be obtained by directly rolling in the width direction of the coil. 1.6 at width of 800 A / m
It is preferable that the length of the magnetic steel sheet is T or more, or the magnetic flux density in the width direction is 1.05 times or more at 800 A / m 2 with respect to the magnetic flux density in the length direction.

In the present invention, when the tooth is necessary, the tooth portion is processed, and then the spiral processing is performed.
With spiral processing, like the core used in conventional alternators for automobiles, bending processing is performed by plastic processing within the plate surface, and by stacking these, a spiral core is created,
A linear motor core having a core of a rotating machine and a curved portion is manufactured.

Due to the spiraling process for forming the spiral core, the core back portion of the motor core is plastically deformed, so that distortion occurs.
Therefore, it is preferable to perform stress relief annealing thereafter. in this case,
The plastically deformed portion of the core back is recrystallized, but if the grain size is small, the magnetic properties are often poor. Therefore, the magnetic properties can be improved by increasing the grain size by annealing. In a non-oriented electrical steel sheet, the grain size that minimizes iron loss at commercial frequencies is often 0.1 to 0.2 mm.
Therefore, also in the present invention, the grain size after annealing is preferably 0.1 mm or more.

The spiral core thus produced is in a laminated state, but it is necessary to perform an electrical insulation treatment between the layers of the laminated core. This is usually a coating applied to a non-oriented electrical steel sheet or a grain-oriented electrical steel sheet, or an oxide film produced on the surface such as a bluing treatment, or a usual one if an insulating effect can be obtained. It may be painted.
Needless to say, a surface treatment that also serves as adhesion between layers may be used. For this surface treatment such as coating, if the end of the spiral core is to be welded before use, it is preferable to select one having good weldability.

Although the case where the core back portion and the teeth portion are integrated has been described above, the core back portion and the teeth portion may be divided into two, and either one or both may be a spiral core. As in Example 4 described later, the tooth portion may be post-processed after the spiral core and separated.

[0014]

【Example】

(Example 1) FIG. 1 shows a long grain-oriented electrical steel sheet 1 having no surface coating. The magnetic flux density in the length direction of the grain-oriented electrical steel sheet, that is, in the rolling direction 2 is 800 A / m and is 1.92T. FIG. 2 shows a steel plate 4 obtained by cutting this in the width direction at the portion indicated by the dotted line 3. FIG. 3 shows a product 5 (welded part 6) which is rotated 90 degrees and welded and connected at a portion corresponding to the end in the width direction before cutting. The long magnetic steel sheet thus obtained has a magnetization characteristic of 800 in the width direction 2b.
At A / m, the magnetic flux density is 1.93T.

FIG. 4 shows a core 7 before helical processing, which is made by toothing the long electromagnetic steel sheet 5 of FIG. 3, and the magnetization characteristic of the tooth 8 in the length direction 9 is 800 A / m. The magnetic flux density is 1.93T.

The core 7 is processed into a spiral core, and then an annealing separation material is applied to prevent the layers from being seized.
Strain relief annealing was performed at 50 ° C. Further, an adhesive coating was applied and heat treatment was performed to obtain a final rotary type spiral core motor core 10 as shown in FIG.

Similarly, FIG. 6 shows an example in which a linear motor core 11 having a curved portion is made based on the core 7 shown in FIG.

(Embodiment 2) A cold rolled sheet of grain-oriented electrical steel sheet is cut in the width direction, then rotated 90 degrees, and welded and joined at a portion corresponding to the end portion in the width direction before cutting. The surface of the weld is flattened by grinding or the like, then washed with oil, etc., and the grain-oriented electrical steel sheet before the coating treatment is obtained through the manufacturing process of the grain-oriented electrical steel sheet after decarburization annealing.
Then, it is punched into the shape of the core 7 appearing in Example 1, and a commonly applied inorganic coating liquid is applied,
Dry, shape to final core shape and bake at 860 degrees. As a result, baking of the coating and removal of processing strains are performed at the same time, and the adhesive force between the layers is 30 g / cm ²
You can also obtain the above.

(Example 3) After cutting a cold-rolled sheet of a grain-oriented electrical steel sheet in the width direction, it is rotated by 90 degrees, and before cutting, the portions corresponding to the ends are welded and joined together. The surface of the welded portion is flattened by grinding or the like, then punched into the shape of the core 7 shown in Example 1, and spirally wound. After that, washing with oil or the like is performed, and the grain-oriented electrical steel sheet before the coating treatment is obtained through the manufacturing process of the grain-oriented electrical steel sheet after the decarburization annealing. A usual inorganic coating solution is applied, dried, molded into a final core shape, and baked at 860 degrees. As a result, the baking of the coating and the removal of the processing strain are performed at the same time, and moreover, the adhesive force between the laminated layers is 30 g / cm ² or more.

(Embodiment 4) A long magnetic steel sheet (magnetization characteristic in the width direction 2b having a magnetic flux density of 1.93T at 800 A / m in the width direction 2b) obtained in FIG. The core 12 of 13 is obtained. However, the teeth tip side (gap side between the stator and the rotor) 15 is connected to the connecting portion 17
Are connected with. This is processed into a spiral core as shown in FIG. The core is wound from the outside and then inserted into the core back portion 24 formed by punching and adhered to complete the core shown in FIG. The connecting portion 17 may be left as it is if there is no problem in the magnetic circuit, but in this case, it is cut off by laser cutting.

(Embodiment 5) A long magnetic steel sheet (magnetization density in the width direction 2b of 800 A / m, magnetic flux density of 1.93 T) obtained in FIG. 3 was punched out, and a tooth portion as shown in FIG. Get the core of. However, the teeth tip side (stator,
The gap side between the rotors) is connected by a connecting portion 17. Winding this core from the outside, then insert it into the core back part also made by spiral processing, glue it,
The core is ready. The connecting portion 17 may be left as it is if there is no problem in the magnetic circuit, but in this case, it is cut off by laser cutting.

[0022]

INDUSTRIAL APPLICABILITY The present invention uses an electromagnetic material such as a silicon steel plate, and has a spiral core that exhibits excellent magnetic characteristics in the longitudinal direction of the teeth of a rotating machine core or a linear motor core, and the like.
It is intended to provide a method of manufacturing a spiral core having very good magnetic properties in the direction perpendicular to the gap so that the magnetic flux from the core can easily flow in the gap in the absence of teeth. In particular, by inserting a spiral core process or the like in the middle of the production process of the grain-oriented electrical steel sheet, it is possible to avoid the adverse effect of the distortion caused by the spiral process. Furthermore, finally, the grain size of the plastically deformed portion of the spiral core can be increased, and the magnetic properties can be greatly improved.

When surface treatment such as coating is performed after spiral processing, peeling of the coating during spiral processing can be suppressed and interlayer insulation is also extremely excellent. If the surface treatment such as coating has an adhesive ability, not only the holding of the core becomes easier, but also the rigidity of the core can be increased, and problems such as noise and vibration can be reduced.

According to the present invention, as in the first embodiment, a spiral core having excellent characteristics in the teeth direction of the motor can be provided, which promotes automation of high-performance servomotor manufacturing. With this servo motor, there are great needs such as robots and electric vehicles, and this is an important field in the future, so we will promote the automation of the production of high-performance servo motors.
Very high value.

[Brief description of drawings]

FIG. 1 shows a long grain-oriented electrical steel sheet 1.

FIG. 2 shows a cut piece 4 of a grain-oriented electrical steel sheet.

FIG. 3 shows the grain-oriented electrical steel sheet 5 cut and welded.

FIG. 4 shows a core 7 in which teeth have been punched before being spirally processed.

FIG. 5 shows a rotating spiral core.

FIG. 6 shows a linear core with a bend.

FIG. 7 shows a core of a tooth portion of a two-divided core before spiral processing.

FIG. 8 shows a tooth portion spiral core of a two-divided core.

FIG. 9 shows a core obtained by combining two-divided cores.

[Explanation of symbols]

1 Long length of grain-oriented electrical steel sheet 2 Length direction of grain-oriented electrical steel sheet, namely rolling direction 2a, 2b Rolling direction of grain-oriented electrical steel sheet 3 Part cut in width direction 4 Grain-oriented electrical steel sheet 1 Steel plate 5 Cut, welded and joined together 6 Welded portion 7 Core before tooth processing and spiral processing 8 Teeth 9 Length direction of tooth 10 Helical core of rotary motor 11 Linear core with curved portion 12 2 divisions Core before helical processing of the teeth of the core 13 Teeth 14 Direction in which the magnetization characteristics are excellent in the longitudinal direction of the teeth 15 Tip direction of the teeth 16 Core back direction of the teeth 17 Connection between the teeth 21 2 split cores Teeth part spiral core 22 slot 23 teeth 24 core back part core 25 teeth joining part

Claims (6)

[Claims] 1. A method of manufacturing a spiral core, which comprises annealing after processing the spiral core. 2. The method for producing a spiral core according to claim 1, wherein the grain size after annealing is 0.1 mm or more. 3. The method for producing a spiral core according to claim 1, wherein an insulating treatment between layers is performed after processing the spiral core. 4. The method of manufacturing a spiral core according to claim 3, wherein the interlayer insulating treatment has an adhesive force. 5. A magnetic flux density in the width direction of 800 A / m is 1.6
5. The method for producing a spiral core according to claim 1, wherein a long magnetic steel sheet for spiral core having a size of T or more is used. 6. A long magnetic steel sheet for a spiral core having a magnetic flux density in the width direction of 1.05 times or more at 800 A / m with respect to a magnetic flux density in the length direction is used.
4. The spiral core manufacturing method according to any one of 4 above.