Inverse shaping device for manufacturing spiral core stator of axial flux-type motor

Abstract

Disclosed is an inverse shaping device for manufacturing a spiral core stator of an axial flux-type motor, the inverse shaping device comprising: an air cylinder (310) for stretching a rod (311); an upper frame (320) having the air cylinder (310) fixed / coupled to the upper end thereof; elevation support shafts (350) coupled to the lower end of both ends of the upper frame (320), respectively; a lower frame (340) having the elevation support shafts (350) fixed / coupled to the upper end thereof; an elevating frame (330) having a rod (311) of an air cylinder (310) coupled to the upper end thereof; an upper roller (360) axially coupled beneath the elevating frame (330) through a pair of first hubs (363) and configured to press a transferred strip steel plate (11); and a lower roller (370) axially coupled above the lower frame (340) through a pair of second hubs (373) and configured to press a transferred strip steel plate (11). The inverse shaping device is advantageous in that, while a strip steel plate having a winding portion formed through the inverse shaping device is stacked / wound in stacking devices, the winding portion is prevented from widening outwards due to tension, and the verticality and concentricity of stacking cores are maintained, thereby reducing the occurrence of defects and improving productivity.

Description

Reverse forming device for manufacturing a stator for a spiral core of an axial flux type motor

[0001] The present invention relates to a reverse forming device for manufacturing a stator for a spiral core of an axial flux type motor, and more specifically, to a device for reverse forming in advance so that a winding portion formed between a blanking portion perforated at a certain interval from a continuous roll portion of a wound steel plate does not spread outward when manufacturing a stator for a spiral core by winding and stacking steel plates.

[0002] Generally, the stator of a motor utilizes a laminated core manufactured by stacking multiple lamina members, which are formed from a magnetic material, such as a thin steel plate, using a press forming device. These multiple lamina members are produced by punching out steel plates using a press forming device and are firmly bonded to adjacent lamina members through a process of applying adhesive or welding with a welding machine while maintaining right angles and concentricity.

[0003] However, the method of stacking and joining multiple laminas as described above had the disadvantage of being difficult to maintain perpendicularity and concentricity precisely. Therefore, to solve the above problem, Patent Document 1 discloses a winding unit for manufacturing a spring-type stator core that can quickly and easily manufacture a spring-type stator core, comprising a winding unit that rotates a base material punched from a blanking unit using an indexing servo motor to wind it into a spring-like shape, a pressurizing unit that guides the base material to be wound neatly, and a control unit that controls the blanking unit and the winding unit to work together.

[0004] The above prior art has the problem that, when manufacturing a single stator core, the base material must be withdrawn from the winding section and manually fixed, and as the diameter of the base material wound in the winding section increases, the tension acting on the base material to be wound changes, making it impossible to align the teeth consistently and thus making it impossible to manufacture a stator core of a uniform shape.

[0005] Moreover, in the past, when referring to the manufactured laminated core of FIG. 1a and the side cross-section of the laminated core of FIG. 2b, there was a troublesome problem in which the winding section (22) between the blanking section (23) spread outwardly, unlike the roll section (21) formed on the laminated core (20) after the winding was completed, due to the difference in tension applied to the base material conveyed by the conveying device while winding the laminated core (20) for manufacturing a stator for a spiral core of an axial flux type motor.

[0006] The present invention aims to solve the above problem by forming a strip-shaped steel plate into a certain shape while conveying it, and then pre-forming a portion of the formed part and winding the laminated core to maintain perpendicularity and concentricity after forming it into a laminated core.

[0007] To achieve the above objective, the present invention provides a reverse forming device for manufacturing a stator for a spiral core of an axial flux type motor, comprising: an air cylinder that extends and retracts a rod using input and output pneumatic pressure; an upper frame to which the air cylinder is fixedly coupled at the top; a lifting support shaft each coupled to the lower ends of both ends of the upper frame; a lower frame installed at a certain distance from the upper frame and to which the lifting support shaft is fixedly coupled at the top; a lifting frame to which both ends are axially coupled to the lifting support shaft each and to which the rod of the air cylinder is coupled at the top; an upper roller axially coupled below the lifting frame through a pair of first hubs and presses a strip steel plate conveyed by contacting the surface; and a lower roller axially coupled above the lower frame through a pair of second hubs and presses a strip steel plate conveyed by contacting the surface.

[0008] In addition, in the present invention, the upper roller may be composed of a first body in a cylindrical shape that presses the roll portion of the steel strip on one side and a second body in a trapezoidal shape that tapers on the other side that presses the winding portion of the steel strip, and the lower roller may be composed of a third body in a cylindrical shape that presses on the roll portion of the steel strip on one side and a fourth body in an inverted trapezoidal shape that tapers on the other side that presses on the winding portion of the steel strip.

[0009] In addition, in the present invention, the first body and second body of the upper roller and the third body and fourth body of the lower roller can be adjusted by adjusting the left and right positions of the first hub that supports the upper roller and the second hub that supports the lower roller, so as to apply pressure in correspondence with the width of the roll portion and the width of the winding portion of the strip steel plate.

[0010] In addition, in the present invention, the taper angle of the second body of the upper roller, which is tapered in a trapezoidal shape according to the thickness of the strip steel plate wound as a spiral core, and the taper angle of the fourth body of the lower roller, which is tapered in an inverted trapezoidal shape, can be applied differently.

[0011] In addition, in the present invention, the air cylinder can pressurize the lifting frame while rolling it up and down according to the conveying tension of the steel strip.

[0012] According to an embodiment of the present invention, the strip steel sheet, in which the winding portion is reverse-formed through a reverse forming device, does not spread outward due to tension while being laminated and wound in a lamination device, thereby maintaining the verticality and concentricity of the laminated core. This eliminates the need for defects in the stator for the spiral core of an axial flux type motor or post-processing, and allows for the manufacture of a stator with a uniform shape, thereby providing the advantages of improved productivity and reduced manufacturing costs.

[0013] Figure 1 is a drawing showing a stacked core for a stator for a spiral core of a conventional axial flux type motor.

[0014] FIG. 2 is a block diagram including a reverse forming device for manufacturing a stator for a spiral core of an axial flux type motor, according to an embodiment of the present invention.

[0015] FIG. 3 shows a laminated core for a stator core manufactured using a stator manufacturing device for a spiral core of an axial flux type motor according to the present invention, FIG. 3a is a schematic diagram showing a wire punched by a press forming device for winding the laminated core for a stator core, FIG. 3b is a plan view showing the laminated core for a stator core, FIG. 3c is a side cross-sectional view showing the laminated core for a stator core, and FIG. 3d is a rear view showing the laminated core for a stator core.

[0016] FIG. 4 is a front view showing a reverse forming device for manufacturing a stator for a spiral core of an axial flux type motor according to the present invention.

[0017] FIG. 5 is a side view showing a reverse forming device for manufacturing a stator for a spiral core of an axial flux type motor according to the present invention.

[0018] FIG. 6 is a plan view showing the operation of a reverse forming device for manufacturing a stator for a spiral core of an axial flux type motor according to the present invention.

[0019] Hereinafter, an embodiment of a reverse forming device for manufacturing a stator for a spiral core of an axial flux type motor according to the present invention will be described with reference to the attached drawings.

[0020] FIG. 2 is a block diagram schematically illustrating a reverse forming device for manufacturing a stator for a spiral core of an axial flux type motor according to the present invention. FIG. 3 shows a laminated core for a stator core manufactured using a stator manufacturing device for a spiral core of an axial flux type motor according to the present invention, FIG. 3a is a schematic diagram showing a wire punched by a press forming device for winding a laminated core for a stator core, FIG. 3b is a plan view showing a laminated core for a stator core, FIG. 3c is a side cross-sectional view showing a laminated core for a stator core, and FIG. 3d is a rear view showing a laminated core for a stator core.

[0021] The conveying device (100) conveys a strip-shaped steel plate (11) supplied from a strip steel plate roll (10), and the conveying device (100) allows the strip steel plate (11) supplied from the strip steel plate roll (10) to be supplied horizontally with a constant tension through a plurality of rolls.

[0022] The pressing forming device (200) forms a blanking section (23) by press-punching one side of a strip steel plate (11) conveyed by a conveying device (100) into a certain shape at a certain interval. The pressing forming device (200) varies the pitch interval of punching the strip steel plate (11) while rotating with pneumatic pressure. This is the strip steel plate (11) punched by the pressing forming device (200) for winding the laminated core (20) for the stator core in FIG. 3a. The laminated core (20) has a structure that is wound and laminated, and when making the blanking section (23) with the pressing forming device (200), the inner length interval gradually increases as it goes toward the outer length interval, so the position value of the servo motor is corrected to correct the interval. And as shown in FIG. 3b, the fan-shaped winding section (22) widens from the inside to the outside, but the rectangular blanking section (23) is formed with a uniform width. FIG. 3c is a side cross-section showing the winding section (22) and the blanking section (23). FIG. 3d shows the back side where the blanking section (23) is not formed, and the laminated core (20) for the stator core is wound with a constant thickness from the inner diameter to the outer diameter.

[0023] Meanwhile, FIG. 4 is a front view showing a reverse forming device for manufacturing a stator for a spiral core of an axial flux type motor according to the present invention, and FIG. 5 is a side view.

[0024] The air cylinder (310) extends and retracts the rod (311) using the air pressure input and output, and the controller controlling the operation of the device will determine and control the pressure for the lifting and rolling of the air cylinder (310). Furthermore, the air cylinder (310) is configured to apply pressure while rolling the lifting frame (330) up and down according to the changing transfer tension of the strip steel plate (11) under the control of the controller.

[0025] An air cylinder (310) is fixedly connected to the upper part of the upper frame (320). A pair of lifting support shafts (350) are connected to the lower ends of both sides of the upper frame (320) at a certain distance from each other.

[0026] The lower frame (340) is installed at a certain distance from the upper frame (320) and has a lifting support shaft (350) fixedly connected to its upper end. The lower frame (340) is fixedly installed on the workbench (2) and is installed so that it can move left and right. Furthermore, the lifting support shaft (350) between the upper frame (320) and the lower frame (340) can also be installed to move left and right.

[0027] The lifting frame (330) has both ends axially connected to the lifting support shaft (350), and the rod (311) of the air cylinder (310) is connected to the top. The lifting frame (330) is raised by the rod (311), which extends and retracts vertically according to the pneumatic pressure entering and exiting the air cylinder (310). The lifting frame (330) is connected to the lifting support shaft (350) at both ends via shaft bearings (331), allowing for smooth and free vertical movement.

[0028] The upper roller (360) is axially connected to the lower lifting frame (330) through a pair of first hubs (363). The upper roller (360) presses the steel strip (11) being transported in contact with the surface. The upper roller (360) is composed of a first body (361) in a cylindrical shape, one side of which presses the roll portion (21) of the steel strip (11), and a second body (362) in a trapezoidal shape that tapers to the winding portion (22) of the steel strip (11) on the other side.

[0029] The lower roller (370) is axially connected to the lifting frame (330) through a pair of second hubs (373). The lower roller (370) presses the steel strip (11) being transported in contact with the surface. The lower roller (370) is composed of a third body (371) in a cylindrical shape, one side of which presses the roll portion (21) of the steel strip (11), and a fourth body (372) in a tapered inverted trapezoidal shape, the other side of which presses the winding portion (22) of the steel strip (11).

[0030] Accordingly, the roll portion (21) of the strip steel plate (11) passing between the first body (361) of the upper roller (360) and the third body (371) of the lower roller (370) is pressed, and the roll portion (21) of the strip steel plate (11) passing between the second body (362) of the upper roller (360) and the fourth body (372) of the lower roller (370) is pressed. Therefore, the roll portion (21) of the strip steel plate (11) passing between the upper roller (360) and the lower roller (370) is made to pass horizontally, and the winding portion (22) is made to pass after being bent at a certain angle.

[0031] In addition, by adjusting the left and right positions of the first hub (363) that supports the upper roller (360) and the second hub (373) that supports the lower roller (370), the first body (361) and second body (362) of the upper roller (360) and the third body (371) and fourth body (372) of the lower roller (370) can be adjusted to apply pressure in response to the width of the roll section (21) and the winding section (22) of the strip steel plate (11). This is because the width of the roll section (21) and the winding section (22) may vary depending on the various types or structures of the stator for the spiral core, and may vary depending on the winding thickness of the laminated core. Accordingly, the boundary between the roll section (21) and the winding section (22) can be moved to the boundary line between the first body (361) and the second body (362) of the upper roller (360) and the third body (371) and the fourth body (372) of the lower roller (370). In addition, depending on the type or structure of the stator core according to the strip steel plate (11), the upper roller (360) and the lower roller (370), which have different shapes, forms, sizes, and diameters, can be applied to the first hub (363) and the second hub (373) respectively in an interchangeable manner.

[0032] Additionally, depending on the thickness at which the strip steel plate (11) is wound as a spiral core, the taper angle of the second body (362) of the upper roller (360), which is tapered in a trapezoidal shape, and the taper angle of the fourth body (372) of the lower roller (370), which is tapered in an inverted trapezoidal shape, may be applied differently. That is, depending on the bending angle of the winding section (22) from the roll section (21) of the strip steel plate (11), the angle of inclination between the second body (362) of the upper roller (360) and the fourth body (372) of the lower roller (370) may vary.

[0033] The lamination device (400) laminates the strip steel plate (11) to a certain thickness by rotating it in one direction with the rotational force transmitted while fixing the end of the strip steel plate (11), which is bent and transported from the reverse forming device (300) for manufacturing a stator for a spiral core of an axial flux type motor according to the present invention, with the jaw.

[0034] The operation of the reverse forming device for manufacturing a stator for a spiral core of an axial flux type motor according to the present invention, configured as described above, is explained with reference to FIGS. 4 to 6.

[0035] First, the strip steel plate (11) is drawn out from the strip steel plate roll (10) on which the strip steel plate (11) in the shape of a thin film before processing is wound, and while passing through the conveying device (100), one side of the strip steel plate is punched in the pressing forming device (200) to form a blanking section (23) and a winding section (22) at regular intervals. Accordingly, the strip steel plate (11) passes through the conveying device (100) and is conveyed with a roll section (21) of a certain width and blanking sections (23) and winding sections (22) repeatedly formed at regular widths and intervals by the punching operation of the pressing forming device (200). At this time, the roll section (21), blanking section (23), and winding section (22) of the strip steel plate (11) are horizontal in cross-section (a-a').

[0036] A strip steel plate (11) having a roll section (21), a blanking section (23), and a winding section (22) formed through a conveying device (100) and a pressing forming device (200) passes between the upper roller (360) and the lower roller (370) of a reverse forming device (300), and the winding section (22) is bent from the roll section (21) at a certain angle (b-b') in cross-section and discharged.

[0037] Furthermore, the air cylinder (310) changes the pressing force of the lifting frame (330) according to the tension of the strip steel plate (11) passing between the upper roller (360) and the lower roller (370), thereby changing the pressing force of the upper roller (360) pressing the lower roller (370). The tension of the strip steel plate (11) will be the tension generated in the strip steel plate roll (10), the tension during transport in the transport device (100), and the tension generated while winding the strip steel plate (11) in the stacking device (400).

[0038] Therefore, the strip steel plate (11), in which the winding portion (22) is reverse-formed through the reverse-forming device (300) according to the present invention, has the advantage of improving productivity and reducing manufacturing costs because the winding portion (22) is not spread outward due to tension while being laminated and wound in the lamination device (400), and the verticality and concentricity of the laminated core (20) are maintained, thereby eliminating the need for defects or post-processing.

[0039] The embodiments described above in the present invention are merely examples, and the present invention is not limited thereto. Any configuration substantially identical to the technical concept described in the claims of the present invention and achieving the same functional effect is included within the technical scope of the present invention.

Claims

1. In a reverse forming device for manufacturing a stator for a spiral core of an axial flux type motor, An air cylinder (310) that extends and retracts a rod (311) using air pressure input and output; An upper frame (320) with the air cylinder (310) fixedly connected to the top; Lifting support shafts (350) each connected to the lower ends of both ends of the upper frame (320); A lower frame (340) installed at a certain distance from the upper frame (320) above, with a lifting support shaft (350) fixedly connected to the top; A lifting frame (330) having both ends axially connected to the lifting support shaft (350) and the rod (311) of an air cylinder (310) connected to the top; An upper roller (360) that is axially coupled to the upper lifting frame (330) through a pair of first hubs (363) and presses a strip steel plate (11) that is conveyed by contacting the surface; A reverse forming device for manufacturing a stator for a spiral core of an axial flux type motor, comprising: a lower roller (370) that presses a strip steel plate (11) that is axially coupled to the lower frame (340) through a pair of second hubs (373) and is conveyed by contacting the surface.

2. In claim 1, the upper roller (360) is composed of a first body (361) in a cylindrical shape, one side of which presses the roll portion (21) of the strip steel plate (11), and a second body (362) in a trapezoidal shape that tapers to the winding portion (22) of the strip steel plate (11) on the other side. The above lower roller (370) is composed of a third body (371) in a cylindrical shape that presses the roll portion (21) of the strip steel plate (11) on one side, and a fourth body (372) that is tapered in an inverted trapezoidal shape that presses the winding portion (22) of the strip steel plate (11) on the other side, in a reverse forming device for manufacturing a stator for a spiral core of an axial flux type motor.

3. In paragraph 2, a reverse forming device for manufacturing a stator for a spiral core of an axial flux type motor, which adjusts the left and right positions of the first hub (363) that axially supports the upper roller (360) and the second hub (373) that axially supports the lower roller (370) to apply pressure in correspondence with the width of the roll portion (21) and the width of the winding portion (22) of the strip steel plate (11), and the third body (371) and fourth body (372) of the lower roller (370).

4. A reverse forming device for manufacturing a stator for a spiral core of an axial flux type motor, wherein, in paragraph 2, the second body (362) of an upper roller (360) tapered in a trapezoidal shape and the fourth body (372) of a lower roller (370) tapered in an inverted trapezoidal shape are applied differently according to the thickness at which the strip steel plate (11) is wound as a spiral core.

5. In claim 1, the air cylinder (310) pressurizes the lifting frame (330) while rolling it up and down according to the transfer tension of the strip steel plate (11), in a reverse forming device for manufacturing a stator for a spiral core of an axial flux type motor.

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