JP4798965B2 - Manufacturing method of rotating machine iron core - Google Patents

Description

The present invention relates to a method of manufacturing a rotary machine core capable of reducing iron loss.

2. Description of the Related Art In recent years, rotating electrical machines such as synchronous machines and induction machines perform variable speed operation by being combined with an inverter and are applied to applications having a wide operating speed such as HEV (Hybrid Electric Vehicle) or micro gas turbine.
When these rotating electrical machines are operated at high speed, the current applied to the stator windings becomes high frequency, and the drive magnetic field generated by the current also becomes high frequency. Also, considering the harmonic current component included in the current, eddy currents are generated in the stator core due to the drive magnetic field, and even if the drive current is a sine wave, there are slots in the stator core. A spatial harmonic component of the magnetic field is generated in the main gap. Then, when this harmonic component enters the rotor core, an eddy current is generated in the rotor core.

Incidentally, the loss at high frequencies of the electromagnetic steel sheet, it is known that have large influence of the eddy current loss proportional to the square of the frequency. The following equation is a general equation that gives the eddy current loss We.
We = C (ωBt) 2 / (24ρd)
Here, C is a constant, ω is an excitation angular frequency, B is a magnetic flux density, t is a plate thickness, ρ is an electrical resistivity, and d is a density.

As is clear from this eddy current loss We, as a measure for reducing the loss of the iron core, there is a means for reducing the eddy current by adopting a material having a high specific electrical resistivity or adopting a thin steel plate. However, since the eddy current loss We is proportional to the square of the plate thickness, it is effective to employ a thin steel plate material.
When adopting a thin steel sheet for a rotating machine iron core, it is a thin sheet with no waist, so when punching into an iron core shape, the bending of the electromagnetic steel sheet is carried out in a feeding device or press machine that sends it to the press machine. It is feared that the magnetic steel sheet may be bent when it is punched or pressed by a press machine, and the yield deteriorates. Furthermore, the use of a magnetic steel sheet thin plate ensures a predetermined core thickness. In order to do this, the number of electromagnetic steel sheets to be punched has increased, and the number of man-hours has increased.

For this reason, multiple sheets of electromagnetic steel sheets are stacked and punched at the same time, and caulking and bundling, thereby reducing the man-hours and reducing man-hours. It was happening that a gap occurred.
Therefore, conventionally, by welding or adhering the vicinity of a portion to be caulked and bonded by overlapping a plurality of electromagnetic steel sheets, it is possible to suppress the deviation between the electromagnetic steel sheets during caulking and improve the yield and reduce the man-hours. A laminated iron core that can be produced is provided (see Patent Document 1).
JP 2003-219585 A

However, according to the conventional example, when the vicinity of the caulking portion of the rotary machine iron core is welded, the welded portion generates thermal strain. For this reason, a hysteresis loss, which is an iron loss, occurs in the rotating machine iron core, and there is a problem that the performance of the rotating electrical machine is deteriorated.
Also, when the vicinity of the caulking part of the rotating machine core is bonded, the adhesive layer is peeled off due to the caulking and binding, causing the warp to the electromagnetic steel sheet, or the rotating machine core in which the peeled adhesive layer is manufactured. electromagnetic steel sheets each other to remain in the gap Mautame, or to generate the slope and the like of the rotating machine core, rotating machine core produced in that state, will be the hysteresis loss is an iron loss occurs, In general, there is a problem that the performance of the rotating electrical machine is degraded.

  The present invention has been made in view of the above circumstances, and a rotating machine core capable of maintaining the performance of a rotating machine by reducing hysteresis loss occurring in the rotating machine core even when a thin electromagnetic steel sheet is adopted. To provide a manufacturing method.

According to the first aspect of the present invention, the end surfaces in the longitudinal direction of a plurality of electromagnetic steel sheets are integrated by welding, and the plurality of electromagnetic steel sheets are simultaneously punched and caulked to form a rotating machine core. Features.
According to such a configuration, by welding the end surfaces of the electromagnetic steel sheet, the electromagnetic steel sheet can be stamped and formed while avoiding the influence of the thermal strain. Hysteresis loss occurring in the iron core can be reduced, and the performance of the rotating electrical machine can be maintained.

According to a third aspect, the substantially entire surface of a plurality of electromagnetic steel plates are integrated by bonding with an adhesive, and crimping bundling constitute rotary machine core with punched these plurality of electromagnetic steel plates at the same time The adhesive layer present between the plurality of electromagnetic steel sheets is applied to substantially the entire surface of a thickness of 3 μm or less and 80% or more of the area ratio of the electromagnetic steel sheet, and constitutes the adhesive layer, It is characterized by using a semi-cured resin .
According to such a configuration, by attaching almost the entire surface of the electromagnetic steel sheet with an adhesive, it is possible to give the adhesive sufficient strength so that the adhesive does not peel off due to punching and caulking impacts. Even if a steel plate is employed, hysteresis loss generated in the iron core due to warpage or inclination of the electromagnetic steel plate can be reduced, and the performance of the rotating electrical machine can be maintained .
Moreover, the intensity | strength of the grade which does not peel also to a punching caulking bundling can be maintained because the adhesive agent apply | coated with respect to the area ratio of an electromagnetic steel sheet shall be 80% or more. Furthermore, by setting the thickness of the adhesive layer to 3 μm, when the rotary machine core is laminated to a predetermined thickness, the permeability of the magnetic steel sheet is increased by increasing the space factor of the electromagnetic steel sheet relative to the cross-sectional area of the rotary machine core. The performance of the rotating electrical machine can be maintained high by improving.

  According to the present invention, even if a thin electromagnetic steel sheet is employed, the performance of the rotating machine can be maintained by reducing the hysteresis loss generated in the rotating machine iron core.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. First, FIG. 1 shows the overall configuration of a rotating machine iron core manufacturing apparatus. In the feeding device 1, two strip-shaped electromagnetic steel plates 2 wound in a hoop shape are arranged vertically. The electromagnetic steel plates 2 and 2 are fed from the feeding device 1 to the press machine 6 through three pairs of feed guide rollers 3, 4 and 5. First, in this case, the electromagnetic steel sheet used for the rotating machine iron core is usually 0.5 mm thick, but in this embodiment, the electromagnetic steel sheet 2 is 0.1 mm thick. The electromagnetic steel plates 2 and 2 of the feeding device 1 are merged and polymerized by a pair of feed guide rollers 3 and sent out. A welding device 7 is provided between the feed guide rollers 3 and 4, and this welding device 7 is welded by using, for example, a pulse laser. It can be welded with almost no heat effect on the welded material. For example, one end face 2a is welded as an end face in the longitudinal direction of the electromagnetic steel plates 2 and 2 fed by the feed guide roller 3 by the welding device 7, and the electromagnetic steel plates 2 and 2 are integrated. Further, the feed guide rollers 4 and 5 work as a reservoir feed device 8 by the cooperation of these, and the reservoir feed portion 8a temporarily stores the electromagnetic steel plates 2 and 2 fed from the feed guide rollers 3 and 4. This is a play between the feeding device 1 and the press machine 6. The electromagnetic steel plates 2 and 2 that have passed through the reservoir feed portion 8a are guided to the press machine 6 by the feed guide roller 5, and the press machine 6 simultaneously welds and integrates the electromagnetic steel plates 2 and 2 to the rotating machine. A punched steel sheet 9a is formed by punching into the shape of an iron core and caulking and binding, and a plurality of these are laminated to form a rotating machine iron core 9.

  The rotor core 9 thus formed corresponds to, for example, the stator core 11 or the rotor core 13 of the induction machine 10 as shown in FIG. The stator core 11 is formed with a plurality of concentric slots 11a. A winding 12 is wound between the slots 11a. A conductor 13a is embedded in the rotor core 13. ing. The induction machine 10 is supplied with power through an inverter (not shown) and the like, and variable speed operation is performed.

  According to such a configuration, the electromagnetic steel plates 2 and 2 are integrated by welding one end surface 2a which is the longitudinal direction thereof, and the electromagnetic steel plates 2 and 2 are simultaneously punched and caulked and bonded to form the rotary machine core 9. I made it up. Therefore, even if the thin electromagnetic steel sheet 2 is adopted, the electromagnetic steel sheets 2 and 2 can be integrated by welding so that the electromagnetic steel sheets 2 and 2 can have a waist, and at the same time, punching and caulking and binding are performed. Man-hours can be reduced. Further, by welding the one end face 2a of the electromagnetic steel plates 2 and 2, the blanked steel sheet 9a after forming is stamped and formed while avoiding the affected part 2b (hatched portion in FIG. 2) due to thermal strain. By reducing the hysteresis loss generated in the iron core, the performance of the rotating electrical machine (induction machine 10) can be maintained.

  Further, since welding is performed by pulse laser as welding of the electromagnetic steel plates 2 and 2, not only the welding head and the electromagnetic steel plate 2 can be brought into non-contact, but also the amount of generated heat is adjusted to a minute amount by changing the number of pulses. be able to. Therefore, since the electromagnetic steel plates 2 and 2 can be integrated and welded with sufficient strength even with a small amount of heat, thermal strain generated in the electromagnetic steel plate 2 can be suppressed.

(Second embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. 3. The same parts as those in the first embodiment are denoted by the same reference numerals.
3 and 4 show the overall configuration of the rotating machine iron core manufacturing apparatus. In FIG. 3, the feeding device 14 is provided with an electromagnetic steel plate 2 that is a thin plate wound in a hoop shape, and the electromagnetic steel plate 2 fed out from the feeding device 14 is a first adhesive feeding device 16. Thus, the first adhesive 17a is applied to substantially the entire surface of the electromagnetic steel sheet 2. Here, the first adhesive supply device 16 controls the thickness of the first adhesive 17a to be applied by the cooperation of the rollers 16a and 16b, and the roller 16a is provided with a groove. A stable film thickness can be maintained because the grooves are accumulated in the first adhesive 17a, and the first adhesive 17a is a two-component type that quickly cures when it comes into contact with the second adhesive 17b described later. The adhesive 17 and the second adhesive 17b are quick-drying and do not require film thickness management. In addition, the electromagnetic steel plate 2 is disposed in the feeding device 18, and the electromagnetic steel plate 2 fed out from the feeding device 18 is provided with a second adhesion provided to be paired with the feed guide rollers 15 and 15. The second adhesive 17 b is applied to substantially the entire surface of the electromagnetic steel sheet 2 by the agent supply device 19. The electromagnetic steel sheet 2 coated with the second adhesive 17b is merged and polymerized with the electromagnetic steel sheet 2 coated with the first adhesive 17a by the feed guide rollers 15 and 15, and substantially the entire surface of the electromagnetic steel sheet 2 is bonded and bonded. And is integrally cured. Here, an adhesive layer, which is an adhesive 17 composed of the first adhesive 17a and the second adhesive 17b, is formed between the electromagnetic steel plates 2 and 2, and this adhesive layer (adhesive 17) is The electromagnetic steel sheet 2 is formed on a substantially entire surface with an area ratio of 80% or more with respect to the area of one surface of the electromagnetic steel sheet 2 and is configured with a thickness of 3 μm or less. Here, when the thickness of the adhesive layer (adhesive 17) exceeds 3 μm, an uncured portion remains, and sufficient strength cannot be exhibited until it is molded by the press machine 6, or the shape of the press machine 6 is reduced. The upper limit is 3 μm at which the capability of the press machine 6 is deteriorated by sticking or the like does not occur.

  The integrated electromagnetic steel plates 2, 2 are fed out by the feed guide rollers 15, 4, 5 and are guided to the press machine 6 via the reservoir feeding device 8. In the press machine 6, the electromagnetic steel plates 2 and 2 fed by the feed guide roller 5 are simultaneously punched into the shape of a rotary machine core and are caulked and bundled to form a punched steel plate 20a. A machine core 20 is formed.

According to such a configuration, even if the thin electromagnetic steel plate 2 is adopted, a plurality of, for example, two substantially entire surfaces of the electromagnetic steel plates 2 and 2 are bonded and integrated with an adhesive. 2 and 2 can be provided with sufficient strength so that they do not peel off due to the impact of punching and caulking and bundling. Since the adhesive was peeled after formation of the rotating machine core can be prevented from occurring in the gap of the electromagnetic steel plates 2, 2, employing electromagnetic steel plates 2 of the sheet, the warpage electromagnetic steel plates 2, 2 which is integrated It is possible to prevent the tilting of the iron core itself even if the rotating machine iron core 20 is formed on the basis of the electromagnetic steel plate 2, and the man-hours can be obtained by punching the electromagnetic steel plates 2 and 2 simultaneously. Can also be reduced. Therefore, even if the thin electromagnetic steel sheet 2 is adopted, the performance of the rotating electrical machine can be maintained by reducing the hysteresis loss generated in the iron core due to the warp of the electromagnetic steel sheet 2 and the inclination of the iron core.

Further, the adhesive layer (adhesive 17) between the electromagnetic steel plates 2 and 2 is formed on substantially the entire surface having an area ratio of 80% or more with respect to the area of one surface of the electromagnetic steel plate 2, and has a thickness of 3 μm or less. It is configured. By setting the adhesive 17 to be applied to the area ratio of the electromagnetic steel sheet 2 to 80% or more, the adhesive 17 acts as a lubricant when punching with the press machine 6 to reduce wear of the blade of the press machine 6, with Ru can be extended die life, it is possible to maintain the strength of the degree that there is no peeling off even for punching caulking unity. Further, by setting the thickness of the adhesive layer (adhesive 17) to 3 μm, when the rotary machine core 20 is laminated to a predetermined thickness, the space factor of the electromagnetic steel sheet 2 with respect to the cross-sectional area of the rotary machine core 20 is set. in a high to Turkey, to improve permeability, it is possible to maintain high performance of the rotating electric machine.

By the way, the rotary machine core 20 corresponds to a stator core (11) or a rotor core (13) (not shown). Since the rotary machine core 20 is formed with slots and conductor embedded holes, a press machine is used. When they are punched by 6, a large punching distortion occurs. For this reason, the loss resulting from punching distortion can be reduced by performing heat treatment.
FIG. 4 shows a heat treatment method for the rotary machine core 20. In FIG. 4, a laminated iron core 21 is an open magnetic circuit in which a part of a leg portion is cut, an excitation winding 22 is wound around one leg portion 21a, and the other leg portion 21b is wound around the other leg portion 21b. A plurality of rotating machine iron cores 20 are fitted. These rotating machine iron cores 20 are continuously supplied to the leg part 21b by being conveyed from one end part of the leg part 21b to the other end part by the conveying device 23.

By the way, the gap portion 21c at both ends of the leg portion 21b is substantially the same as the thickness of the rotary machine core 20, and when the excitation winding 22 is excited, the rotary machine core 20 is placed in the gap portion 21c. Performed in the presence of For this reason, when the leg portion 21a is excited and magnetic flux is generated, the magnetic flux passes from the leg portion 21a through the rotating machine core 20 and enters the leg portion 21b, and further passes through the rotating machine iron core 20 to pass through the leg portion 21a. Therefore, the rotating machine iron core 20 existing in the gap portion 21 c is used as a part of the laminated iron core 21. When excitation is performed by passing the current I through the excitation winding 22, magnetic flux is linked to the rotating machine core 20 via the legs 21 b, and a large short circuit occurs in the circumferential direction in the rotating machine core 20. flowing current. The size of the short-circuit current is a magnitude of the nI as turns n, Joule loss generated in the rotating machine core 20 is proportional to (nI) ^2, as it can provide sufficient heat to the heat treatment is there.

Then, by adjusting the current I flowing through the exciting winding 22, the temperature required for heat-treating the rotary machine core 20 is set, and the rotary machine core 20 is heat-treated at 500 ° C., for example.
Here, the rotating machine core 9 shown in the first embodiment is carried out the usual heat treatment temperature above 700 ° C., the strain generated in the electromagnetic steel sheet can be removed by recrystallization, the iron loss, It can be recovered without changing the value of the base material.

However, since the adhesive can withstand a temperature of more than the current 700 ° C. is not present, the polymerized core with an adhesive, it is not possible heat treatment at 700 ° C. or higher. However, there are adhesives that can maintain the adhesive strength for heat treatment at 500 ° C. or lower.
Table 1 shows the experimental results of heat treatment at a temperature of 300 ° C. to 500 ° C. in a thin electromagnetic steel plate that is generally used, with the loss of the base material of the electromagnetic steel plate as 1 and expressed as a ratio. It is a thing.

熱処理無しに比べて、３００℃では０．２、４００℃では０．６、５００℃では０．９改善されているのがわかる。５００℃以下の温度では、完全に特性が改善されているわけではないが、熱処理の効果があるといえ、設定温度が高くなるに従い、回復量は増えることがわかる。このように通常の熱処理の温度である７００℃よりも低温（５００℃以下）であっても、緩和できる熱ひずみは存在することから、損失低減効果は大きいといえる。そのため、接着剤の樹脂により接着力を失う限界温度に合わせて３００℃から５００℃の範囲内で熱処理を行うことができる。

It can be seen that the improvement is 0.2 at 300 ° C., 0.6 at 400 ° C., and 0.9 at 500 ° C. as compared to the case without heat treatment. Although the characteristics are not completely improved at a temperature of 500 ° C. or less, it can be said that there is an effect of heat treatment, and it can be seen that the recovery amount increases as the set temperature increases. Thus, even if the temperature is lower than 700 ° C. (500 ° C. or less ), which is a normal heat treatment temperature, there is thermal strain that can be relaxed, and thus the loss reduction effect can be said to be great. Therefore, heat treatment can be performed within a range of 300 ° C. to 500 ° C. in accordance with a limit temperature at which the adhesive strength is lost by the adhesive resin.

(Modification)
Since the rotary machine core 20 can be heat-treated by excitation with the laminated core and the shape of the laminated core is sufficient, laminated cores 24 and 25 as shown in FIGS. 5 and 6 may be used.
First, the laminated iron core 24 of FIG. 5 has one leg part 24a around which the excitation winding 22 is wound and the other leg part 24b. The other leg 24b is composed of legs 24ba, 24ba and legs 24bb that wrap around the legs 24ba. When the excitation winding 22 is excited in the wrap 24c, the wrap part 24c is provided with the rotating machine core 20. Performed in the presence of According to this, since the magnetic flux flowing through the rotating machine core 20 flows in the radial direction of the rotating machine core and does not pass between the layers of the electromagnetic steel plates 2 and 2, the magnetic flux flows more efficiently.

Next, the laminated core 25 of FIG. 6 has one leg portion 25a around which the excitation winding 22 is wound and the other leg portion 25b. One yoke part 25c is pivotally connected to the leg part 25a by a pivot part 25d so that it can be opened and closed. After the rotating machine core 20 is fitted to the leg part 25b, the yoke part 25c is closed and fixed. The laminated core 25 can be a closed magnetic circuit by fixing it to the other leg 2 5 b with a pin or the like at the portion 25 e. Therefore, the rotating machine iron core 20 can be excited with a small alternating current.

(Third embodiment)
Hereinafter, a third embodiment of the present invention will be described with reference to FIGS. 7 and 8. The same parts as those in the second embodiment will be denoted by the same reference numerals, and the differences will be described below.
Figure 7 shows an overall configuration of a manufacturing apparatus for a rotating machine core, that put in the second embodiment, in place of the two-liquid type adhesive 17, the adhesive of one-pack type composed of a thermosetting resin Instead of the pair of feed guide rollers 15 and 15, a pair of feed guide rollers 27 and 27 are arranged at a predetermined interval (thickness) and used between the feed guide rollers 27 and 4. The pair of feed guide rollers 28 and 28 are newly arranged at a predetermined interval (thickness). The feed guide rollers 27 and 28 are provided with permanent electromagnets 27a and 28a. An induction heating device 29 is provided between the feed guide rollers 27 and 28.

  Next, the operation of this embodiment will be described. The electromagnetic steel sheet 2 sent from the feeding device 14 is coated with an adhesive 26 by an adhesive supply device 30, and the electromagnetic steel plate 2 coated with the adhesive 26 and the electromagnetic steel plate 2 sent from the feeding device 18. Are attached by the feed guide rollers 27 and 27. Here, the enlarged view at the time of bonding is shown in FIG. As shown in FIG. 8, the magnetic steel plates 2 and 2 that join each other are strongly attracted and brought into close contact with the feed guide rollers 27 and 27 by the permanent magnets 27a and 27a. And the thickness dimension between the lower surface of the lower electromagnetic steel sheet 2 is constant, and the thickness of the adhesive 26 between the electromagnetic steel sheets 2 and 2 changes. Then, the adhesive 26 is heated to be semi-cured or completely cured by the induction heating device 29, and finally adjusted to the thickness set by the feed guide rollers 28, 28, so that the predetermined thickness is obtained as a whole. The electromagnetic steel plates 2 and 2 having a length are formed.

  By the way, a general electromagnetic steel sheet has a thickness deviation in the width direction with respect to the longitudinal direction, and the accuracy of the main gap of the rotating machine iron core is deteriorated by the accumulation of the deviation when the electromagnetic steel sheets are laminated. Therefore, if the thickness deviation of the electromagnetic steel sheet is accurately managed from the manufacturing stage, the manufacturing cost of the electromagnetic steel sheet will increase, so the thickness deviation is absorbed by inverting and stacking the rotor cores for each predetermined stacking amount. It was necessary to work to solve it.

  According to the configuration of this embodiment, a pair of feed guide rollers 27 and 28 for magnetically attracting the electromagnetic steel plates 2 and 2 are installed, and between the electromagnetic steel plates 2 and 2 sucked by these feed guide rollers 27 and 28. Since the adhesive 26 is supplied, the thickness deviation of the electromagnetic steel sheet 2 is absorbed by the flexibility of the adhesive 26 by passing between rollers set at a predetermined interval, and the integrated electromagnetic steel sheet 2 is integrated. , 2 can have a predetermined thickness. Therefore, it is possible to omit the conventional work of rotating and correcting the iron core blocks of the rotor core, and to form the electromagnetic steel plates 2 and 2 with a well-integrated parallelism.

(Fourth embodiment)
Hereinafter, a fourth embodiment of the present invention will be described with reference to FIG. 9, and the same parts as those in the second embodiment will be described with the same reference numerals.
FIG. 9 shows an overall configuration of a magnetic steel sheet winding device for a rotating machine core. In FIG. 9, an adhesive 32 made of semi-cured resin is applied to, for example, substantially the entire surface of one side of the electromagnetic steel sheet 2 by the adhesive supply device 31 to the electromagnetic steel sheet 2 sent out from the feeding device 14. . The electromagnetic steel plate 2 and the electromagnetic steel plate 2 fed from the feeding device 18 are bonded together by the feed guide rollers 33 and 33. The integrated electromagnetic steel plates 2 and 2 are wound into a hoop shape by a winding device 35 via a feed guide roller 34 to form a hoop-shaped steel plate 36. Then, the hoop-shaped steel plate 36 is sent to a press machine or the like (not shown), and is punched and crimped to form a rotating machine iron core.

According to this structure, after the electromagnetic steel plates 2, 2, is integrated with bonded using a semi-cured resin as an adhesive, and the work of winding the magnetic steel sheets 2, 2 hoop, the hoop Based on the steel plate 36, the work of punching and caulking and binding to form the rotating machine core can be performed in different places, and the efficiency is improved. In this case, the stress at the time of winding in a hoop shape with a small diameter can be absorbed by the flexible semi-cured resin.

(Fifth embodiment)
FIG. 10 shows a fifth embodiment of the present invention. The same parts as those in the first embodiment will be described with the same reference numerals, and the differences will be described below.
In this embodiment, instead of using the electromagnetic steel plate 2, an electromagnetic steel plate 37 having no coating on the surface is used, and an adhesive supply device 38 is used instead of the feed guide rollers 4 above the pair of feed guide rollers 4 and 4. By providing, on one side of the electromagnetic steel plates 37 and 37 that are bonded and integrated, a one-pack type adhesive 39 with a thickness of 3 μm is formed on the substantially entire surface of the electromagnetic steel plates 37 and 37 to an area ratio of the electromagnetic steel plate 37, for example. After being applied to 80% or more, punching and caulking and binding are performed to form a punched steel sheet 40a, and a plurality of these are laminated to form the rotating machine core 40.

  By the way, the thickness of the coating film on the surface of a general electromagnetic steel sheet is about 0.5 to 1.0 μm, and when a 3 μm adhesive is applied, the film thickness is about 4.0 μm. Since the lamination thickness is regulated by the rating, the increase in the film thickness reduces the space factor of the electromagnetic steel sheet with respect to the rotating machine core. There is a problem that the decrease in the space factor leads to a decrease in torque of the rotating machine.

According to such a configuration, the rotary machine core 40 is punched and bonded by applying the adhesive 39 to one surface of the magnetic steel sheets 37 and 37 which are bonded and integrated using the magnetic steel sheets 37 and 37 having no coating. Since there is an adhesive 39 between the electromagnetic steel plates 37, the insulation of the rotating machine core 40 is cut as compared with a rotating machine core formed of a magnetic steel sheet having a coating without reducing the insulation performance. The space factor of the electromagnetic steel sheet 37 with respect to the area can be increased, and the torque reduction of the rotating electrical machine can be suppressed. Further, when the stamping and caulking and binding are performed by the press machine 6, the adhesive 39 applied to the surfaces of the integrated electromagnetic steel sheets 37 and 37 serves as a lubricant, whereby the durability of the cutter of the press machine 6 is improved. Can be improved.

(Other examples)
In the above embodiment, instead of the electromagnetic steel plate 2, a general structural steel or a pure iron-based thin plate may be used. In this case, even electromagnetic materials with poor performance at commercial frequencies are low loss materials for high frequency applications where the effect of plate thickness is dominant, and non-magnetic materials such as silicon to improve electrical resistivity. Since it is a material without added body, there is an advantage that the saturation magnetic flux density of the material itself is high, and by improving the saturation magnetic flux density, the effect is substantially the same as improving the space factor. Obtainable. Furthermore, since it is a low-grade electromagnetic material, the unit price of the material itself is low, which helps to reduce costs.

  In the second and fifth embodiments, the adhesive 17 is used. However, instead of the adhesive 17, an adhesive made of a semi-cured resin may be used. In this case, when the coil 12 is wound between the slots 11a of the stator core 11 of the induction machine 10 that has been punched and caulked and bonded to the varnish when the varnish heat treatment is performed, the varnish and the adhesive become familiar, and the semi-cured resin The adhesive is completely cured. Thereby, the heat dissipation characteristic with respect to the heat_generation | fever by the electric current which flows into the coil | winding 12 at the time of the driving | operation of the induction machine 10 becomes good.

Although the heat treatment is performed in the second embodiment, the same heat treatment may be performed in the first, third, and fifth embodiments.
In the third embodiment, although a substantially installed horizontally constituting the feed guide rollers 27, 28, by tilting increase these feed guide rollers 27, 28 from the horizontal direction, and formed form a predetermined thickness In such a case, a configuration may be employed in which excess adhesive discharged from the end portions of the electromagnetic steel plates 2 and 2 is removed from the surface of the electromagnetic steel plate 2.

In the third embodiment, the permanent magnets 27a and 28b are used. However, an electromagnet may be used instead of the permanent magnet.
In the third embodiment, the magnetic steel plates 2 and 2 are attracted by the permanent magnets 27a and 28b to obtain a predetermined thickness, but the same as the second, fourth and fifth embodiments. A configuration may be applied.

In the said Example, although it was set as the structure bonded together using the two electromagnetic steel plates 2 and 37, it is not necessary to specifically limit to 2 sheets , It is good also as a structure which bonds 3 or more sheets simultaneously.
In the first embodiment, the welding device 7 is installed between the feed guide rollers 3 and 4, but it is not necessary to fix the welding device 7 at a specific location. May be.

  In the said Example, although it was set as the structure applied to the stator core 11 or the rotor core 13 of the induction machine 10 as a rotary machine core, it is not necessary to limit to the induction machine 10 and a synchronous machine may be sufficient.

FIG. 1 is an overall configuration diagram (a) showing a first embodiment of the present invention and a top view (b) of a magnetic steel sheet. Cross-sectional view showing a cross section of a rotating electrical machine Overall configuration diagram showing a second embodiment of the present invention Diagram showing heat treatment of rotating machine iron core FIG. 4 equivalent diagram showing a modification FIG. 4 equivalent diagram showing a modification FIG. 3 equivalent view showing a third embodiment of the present invention. Partial enlarged view of FIG. FIG. 3 equivalent view showing a fourth embodiment of the present invention. FIG. 3 equivalent view showing a fifth embodiment of the present invention.

Explanation of symbols

  In the drawings, 1, 14 and 18 are feeding devices, 2 and 37 are electromagnetic steel plates, 2a is one end surface, 2b is an affected area, 3, 4, 5, 15, 27, 28, 33 and 34 are feed guide rollers, 6 is a pressing machine, 7 is a welding device, 9, 20 and 40 are rotating machine iron cores, 9a, 20a and 40a are punched iron cores, 16 is a first adhesive supply device, 16a and 16b rollers, 17, 26, 32 and 39. Is an adhesive, 19 is a second adhesive supply device, 21, 24 and 25 are laminated iron cores, 21a, 24a and 25a are leg portions (one leg portion), and 21b, 24b and 25b are leg portions (the other leg). 24ba, 24ba and 24bb are legs, 21c is a gap, 22 is an excitation winding, 24c is a wrapping part, 25c is a pivoting part, 25d is a fixed part, 27a and 28a are permanent magnets, 29 is an induction heating device, 30 , 31 and 38 are adhesive supply devices, 35 is a winding device, 3 It shows a hoop-shaped steel plate.

Claims (9)

  Manufacturing of a rotating machine core characterized in that a plurality of electromagnetic steel sheets are welded and integrated in the longitudinal direction, and the plurality of electromagnetic steel sheets are punched simultaneously and caulked and bound to form a rotating machine core. Method.   2. The method of manufacturing a rotating machine core according to claim 1, wherein a pulse laser is employed as a welding method. Bonding and integrating almost the entire surface of a plurality of electromagnetic steel sheets with an adhesive, simultaneously punching and binding these plurality of electromagnetic steel sheets together to constitute a rotating machine iron core ,
The adhesive layer existing between the plurality of electrical steel sheets is applied to substantially the entire surface of 80% or more in thickness within 3 μm and in the area ratio of the electrical steel sheet,
A method of manufacturing a rotating machine iron core, wherein a semi-cured resin is used as an adhesive constituting the adhesive layer . After a plurality of electromagnetic steel plates are bonded and integrated using a semi-cured resin as an adhesive, the electromagnetic steel sheet is wound into a hoop shape, and punched and caulked and bound based on the wound electromagnetic steel sheet 4. The method of manufacturing a rotating machine core according to claim 3, wherein the rotating machine core is constituted . 5. A rotating machine according to claim 3, wherein a pair of rollers for magnetically attracting the electromagnetic steel plate is provided, and an adhesive is supplied between the electromagnetic steel plates attracted by these rollers. Manufacturing method of iron core. The method for manufacturing a rotating machine core according to any one of claims 3 to 5, wherein an electromagnetic steel plate having no coating on the surface is used as the plurality of electromagnetic steel plates . 7. The method of manufacturing a rotating machine core according to claim 3, wherein a general structural steel or a pure iron-based thin plate is used as the plurality of electromagnetic steel plates . The method for manufacturing a rotary machine core according to any one of claims 3 to 7 , wherein the rotary machine core is heat-treated at 500 ° C or lower . A winding is wound on one leg of the laminated iron core, and a rotating machine iron core is fitted on the other leg, and the rotating machine iron core is heat-treated by flowing an alternating current through the winding. The manufacturing method of the rotary machine iron core of Claim 8 .

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