JPH02246754A - Corrector of motor stator core - 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] [Field of Industrial Application] The present invention relates to a method for manufacturing a stator core of a DC or AC motor used in machine tools, robots, and home appliances such as refrigerators and air conditioners. In particular, the present invention relates to a stator core straightening device that requires less machining force and improves the accuracy of the core.

[Conventional technology]

Conventionally, stator cores for electric motors have been manufactured by punching and molding magnetic steel plates, but the low material yield υ has made this an avenue for cost reduction. Therefore, in order to improve the material yield tb, we used a strip plate with toothing applied to a part of the width direction.
Attempts have been made to produce wound cores formed into a spiral shape.

By the way, in this type of wound core, the inner and outer peripheries of the arc-shaped iron pieces that are sequentially laminated have no unevenness and have a predetermined dimensional accuracy, the teeth are aligned in the direction of the central axis of the core, and the slot openings are aligned. It is important that there are no irregularities. This is especially necessary when pressing the wound core into the case, maintaining a constant gap between the tooth tip and the rotor, and inserting the coil into the slot of the wound core. , regarding the manufacture of wound iron cores, for example, JP-A No. 8558
As described in Japanese Patent Publication No. 58851 and Japanese Patent Publication No. 59-56505, there is a device in which a core winding device is provided with a bin, and the bin is inserted into a slot of the winding core to align the teeth.

In addition, as described in Japanese Patent Publication No. 61-12468,
After forming the wound core, a punch with a number of keys around it is press-fitted into the center of the wound core to straighten the inner periphery of the wound core, and a portion of the keys are inserted into the slot opening of the wound core. There are ways to align your teeth. Similarly, in order to flatten the unevenness on the inner periphery of the wound iron core,
There is a method using a one-roll tool as described in Japanese Patent No. 0. - A method for straightening the outer periphery of an annular article is described in Japanese Patent Publication No. 43167/1983.

[Problem to be solved by the invention]

Among the above-mentioned conventional techniques, the ones described in Japanese Patent Application Laid-Open No. 58-58851 and Japanese Patent Publication No. 59-46503 disclose that when the teeth of the wound core are misaligned, the teeth of the wound core are temporarily fixed by inserting a bottle. Even if the iron pieces are aligned, the arc-shaped iron piece will come off the bin before it goes around, so the internal strain that had been stored in the iron piece will be released and the teeth of the wound iron core will become misaligned. Possible〇Also, Japanese Patent Publication No. 12468/1983 and Japanese Patent Publication No. 1983-12468
The method described in Japanese Patent No. 45167 corrects the entire circumference of the iron core or the entire length in the central axis direction at the same time.
Due to the frictional force between the tool and the iron core, the machining force becomes large. For this reason, the alignment device has become larger and more complicated.
As a solution to this problem, a roll tool can be used as described in Japanese Patent Publication No. 59-6140, but the size of the tooth part of the slot opening of the iron core is small. Therefore, there is a risk that the part may be deformed more than necessary.

An object of the present invention is to provide a wound core straightening device that is used for straightening the inner and outer peripheries and slot openings of the core after winding and is low in processing force, has a long tool life, and is inexpensive. .

[Means to solve the problem]

To achieve the above purpose, the outer circumference of the wound core.

A rotatable roll-shaped tool was pressed against the inner periphery and the slot opening and moved in the direction of the central axis of the iron core.

[Effect]

The rolled tool is pressed against the outer or inner periphery of the wound core, or inserted into a slot opening, and moved in the direction of the central axis of the core. At this time, the outer periphery of the wound core and the tips of the teeth are plastically deformed (the outer diameter becomes smaller), the inner diameter and slot opening become sharper, and each unevenness becomes smaller, improving the precision of the wound core. will be done. In addition, since the contact area between the iron core and the rolled tool is small, the machining force is small, and since the rolls have multiple rolling contacts, there is no wear or galling, and the tool life is long.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. FIG. 1 is a vertical sectional view of the straightening device and the wound core of this embodiment. FIG. 2 is a cross-sectional view of FIG. 1, showing the arrangement of the roll-shaped tools. FIG. 3 is an external view of a roll-shaped tool for straightening the outer periphery, and FIG. 4 is an external view of a roll-shaped tool that can straighten the inner periphery and the slot opening in the same way.

The wound core 1 has a notch 2. Outer periphery 3*tlt4+ Slots 5 and slot openings 6 are provided at equal intervals of υ24 per round.◇The outer periphery of the outer periphery straightening roll 7 is in the shape of a serpentine, and its radius of curvature R is equal to the winding core. The width of the outer circumference straightening roll 70 is α5 mm larger than the width of the outer circumference 60 of the wound core.In addition, shafts 8 are provided at both ends of the outer circumference straightening roll 7.・
The inner circumference/slot opening correction roll 9 is constructed by integrating a barrel-shaped inner diameter correction roll 10, a ring-shaped slot opening correction roll 11, and a shaft 12. The width of each roll 1o for inner diameter correction is equal to the tooth 40 of the wound core 1.
The radius of curvature r of the outer periphery in the roll center axis direction is the same as the design value of the inner radius of the wound core 1, and the width of the ring-shaped slot opening straightening roll 11 is equal to the width of the slot opening of the wound core 1. 01 mm larger than the gap amount in B.

The bearing 13 is attached to the shaft 8 of the outer circumferential straightening roll 7, and the bearing 13 is inserted into the groove with a semicircular cross section provided in each of the outer circumferential rings 14.15. 7 is installed. Outer ring j4.15
is attached to the base 19 by bolts 17 and 18 through spacers 16. Twenty-four outer periphery straightening rolls 7 are arranged facing the outer periphery 3 of the wound core 1. Also, 24
The diameter of the envelope drawn by each outer circumference straightening roll 7 is also 12 mm smaller than the outer diameter of the wound core 1.

A bearing 20 is attached to the shaft 12 of the inner periphery/slot opening correction roll 9, and the bearing 20 is inserted into a groove with a semicircular cross section provided in each of the holders 21 and 22.
．． A roll 9 for straightening the inner periphery and slot opening is attached to 22. Holders 21 and 22 are connected via spacer 25)
24.25 is attached to the spacer 19. Six inner periphery/slot opening correction rolls 9 are arranged facing each two teeth 4 of the wound core 1. In addition, the 6 inner circumferences
Inner diameter correction roll 10 of slot opening correction roll 9
The diameter of the envelope drawn by is α2m smaller than the inner diameter of wound core 1.
Arrange it so that it is larger than m.

The wound core 1 is fixed by a bolt 28 between rings 26 and 27.The ring 27 is also fixed to a rotatable table 29.
installed on. For such a wound core 1, the outer periphery straightening roll 7 and the inner periphery/slot opening straightening roll 9, which were at the top dead center of a press (not shown) so as not to come into contact with the wound core 1, were used before work. The attached base 19,
The roll 7 for straightening the outer periphery is lowered by the press described above, and the inner periphery and
Inner diameter correction roll 10 of slot opening correction roll 9
contacts the teeth 4 of the wound core 1, and when the slot opening correction roll 11 is inserted into the slot opening B, the wound core 1 against which the roll is pressed undergoes local plastic deformation. The amount of plastic deformation in the convex portions of each layer of the outer periphery 3, teeth 4, and slot opening B of the wound core 1 is large, and the amount of plastic deformation in the concave portions is small. The unevenness of each layer of the opening 6 is clear, the outer diameter is small and narrow, and the inner diameter and the gap between the slot openings are large.

As the outer periphery correction roll 7 and the inner periphery/slot opening correction roll 9 descend along the wound core 1 while rolling υ, the 24 outer periphery parts 6, 12 teeth 4, and 6 parts are removed. The slot opening 6 can be corrected at the same time. When the process of lowering the roll for the first time is completed and the valley roll is separated from the winding core 1 and reaches the bottom dead center of the press, the table 29 is rotated 30 degrees to the right (effect of the invention) for the 011th time. When the roll is lowered, if the inner diameter straightening roll 10 contacts @4a and 4b of the wound core 1 and the slot opening straightening roll 11 is inserted into the slot opening 6a, the table 29 is rotated at 30 degrees. By rotating the inner diameter correction roll 10, the teeth 4c of the wound core 1 are rotated.

At the position 4d, the slot opening correction roll 11 comes to the slot opening 6c. When the roll is raised in this position, the teeth 4c and 4d of the wound core 1 and the slot opening 6c are newly corrected. When the roll has finished rising and reached the top dead center of the press, the table 29 is rotated 15 degrees to the left.

At this time, the inner diameter correction roll 10 rotates the teeth 4b of the wound core 1.
, 4cK, and the slot opening correction roll 11 comes to the position where it is inserted into the slot opening 6b. Next, when the roll is lowered for the second time, the slot opening 6b is newly corrected. Once the roll reaches the bottom dead center of the press,
Rotate the table 29 another 50 degrees to the right. At this time, the inner diameter straightening roll 10 comes into contact with @4 outer peripheral rings d and 4alC of the wound core 1, and the slot opening straightening roll 11 comes to a position to be inserted into the slot opening 6d. By raising the roll again, the slot opening 6d
will be newly corrected.

In this embodiment, as described above, the outer periphery 6, teeth 4, and slot openings 6 of the wound core 1 can all be corrected during two reciprocations of the roll. In addition, the outer peripheral part 5 of the wound core 1, @4,
The amount of unevenness in each layer of the slot opening 6 was reduced by half compared to before correction. In addition, the outer periphery 3, $4, and slot opening 6 of the wound core 1 that are in contact with the roll are each about 10 layers, and the roll is rotatable, so the processing force is small, and the processing surface of the roll is Wear is also small. In this example, the amount of correction on the outer and inner circumferences of the wound core 1 is 0.2 mm.
The amount of correction of the slot opening was α1 mm, but if the accuracy after the core was wound was not good enough (even 105 mm would be acceptable), no incorrect deformation of the core occurred until the amount of correction was α4 mm. Although this embodiment concerns a wound core, the same effect can be obtained with a conventional punched and punched core.

According to the present invention, the machining force is small and the wear of the rolls is small, so the tool life is long, and the device can be simplified and downsized, so the device can be made inexpensive.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of this embodiment, and Fig. 2 is an I-I of Fig. 1.
The sectional view, FIG. 5, and FIG. 4 are external views of the roll-shaped tool of this embodiment. DESCRIPTION OF SYMBOLS 1... Winding core, 5... Outer periphery, 4... Teeth, 5...
... Slot, 6... Slot opening, 7... Roll for straightening outer circumference, 9... Roll for straightening inner circumference/slot opening, 14°15... Outer circumference ring, 21.22...
Holder, 24...Base, 26.27...Ring,
29...table. F ~ 22, So No. 21 ¥1 No. 10

Claims (1)

[Claims] 1. A plurality of rotatable roll-shaped tools are provided within the circumference of a stator core for an electric motor, each facing the outer periphery or inner periphery or the slot opening, or the inner periphery and the slot opening. A straightening device for a stator core for an electric motor, characterized by: 2. Claim 1, characterized in that the envelope of the rolled tool provided around the outer periphery of the stator core for an electric motor is a circle whose diameter is 0.05 mm to 0.4 mm smaller than the outer diameter of the core. The described straightening device for a stator core for an electric motor. 3. Claim 1, characterized in that the envelope of the rolled tool provided on the inner periphery of the stator core for an electric motor is circular with a diameter that is 0.05 mm to 0.4 mm larger than the inner diameter of the core. The described straightening device for a stator core for an electric motor. 4. A roll-shaped tool characterized by being barrel-shaped and having a ring-shaped protrusion in the center thereof.