JP2005198361A - Method and device for manufacturing stator iron core of motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a device for manufacturing the stator iron core of a motor which can effectively raise the circularity of the bore of a single core. <P>SOLUTION: This invention relates to the method of manufacturing a stator iron core 2 which is constituted by stamping out single cores 3 along die-cutting line 45 from stator material 4 and stacking these single cores 3. This method of manufacturing the stator iron core 2 includes a process (ST2) of forming a slit 42 on the die-cutting line 45 to the stator material 4 and a process (ST5) of punching the bore of the single core 3 from the stator material 4 after formation of the slit 42. For the slits 42, openings are connected with each other by an unpunched part 43, at the intersection with a straight line drawn from the center of the bore of the single core 3 to a magnetic pole part 35 or in the vicinity of the intersection. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method and an apparatus for manufacturing a stator core of a motor, and more particularly to a method and an apparatus for manufacturing a stator core of a motor that can effectively increase the roundness of a single core inner diameter portion.

As a method for manufacturing a stator core of a motor such as a conventional stepping motor, a technique described in Patent Document 1 is known. 11 and 12 are an explanatory diagram (FIG. 11) and an enlarged view (FIG. 12) showing a conventional method of manufacturing a stator core.
In the conventional method for manufacturing a stator core, first, a slit 142 is provided on the punching line 145 in the stator material 104 (ST102), and the constituent parts 132 to 134 of the single core 103 are sequentially provided in steps (ST103 to ST103). After that, the single core 103 is punched from the stator material 104 along the punching line 145 (ST106). And this single core 103 was laminated | stacked and the stator core was manufactured.
Here, the slits 142 formed on the four sides are formed in order to suppress internal stress applied to the inner diameter side when the single core 103 is punched, and thereby, such as warpage of the stator core, parallelism, etc. Minimize dimensional changes.

Japanese Patent Laid-Open No. 63-1347

However, in the conventional method for manufacturing a stator core of a motor, the slit 142 is formed prior to the constituent parts 132 to 134 of the single core 103. For this reason, the stator material 104 with reduced rigidity is fed, and the stator material 104 is likely to be displaced or stretched, and the roundness of the inner diameter portion of the formed single core 103 is lowered.
Further, since the roundness of the inner diameter portion of the single core 103 is lowered, there is a problem that the torque balance of the motor is deteriorated.

  The present invention has been made in view of the above problems, and provides a method and an apparatus for manufacturing a stator core of a motor that can effectively improve the roundness of a single core inner diameter portion. With the goal.

  In order to achieve the above object, a method for manufacturing a stator core of a motor according to the present invention includes punching a single core from a stator material along a punching line, and stacking the single cores to form a stator core. In the method of manufacturing a stator core of a motor, the step of providing a slit on the punching line for the stator material, and the step of punching the inner diameter center of the single core from the stator material after providing the slit And the slit is connected to the opening by a non-punched portion that is not punched at or near the intersection with the straight line drawn from the inner diameter center of the single core to the magnetic pole. It is characterized by that.

  In the present invention, the slit is connected to the opening by the non-punched portion that is not punched at or near the intersection with the straight line drawn from the center of the inner diameter of the single core to the magnetic pole portion. In such a configuration, since the non-punched portion suppresses the opening of the slit and reinforces the rigidity of the stator material, the roundness of the single core inner diameter portion can be effectively increased.

  Further, in the method for manufacturing a stator core of a motor according to the present invention, a stator core is formed by punching a single core from a stator material along a punching line and laminating the single core to form a stator core. In the method of manufacturing an iron core, the method includes a step of providing a slit on the punching line for the stator material, and a step of punching an inner diameter center of the single core from the stator material after providing the slit, and The stator material has a non-punched portion that is not punched at an intersection portion of the punching line and a straight line drawn from the inner diameter center of the single core to the magnetic pole portion or in the vicinity of the intersection portion. To do.

  In the present invention, the stator material has a non-punched portion that is not punched at the intersection of the punching line and the straight line drawn from the center of the inner diameter of the single core to the magnetic pole portion or in the vicinity of this intersection. In this configuration, since the non-punched portion reinforces the rigidity of the stator material applied in the linear direction described above, the roundness of the single core inner diameter portion can be effectively increased.

  In the method for manufacturing a stator core of a motor according to the present invention, a single core is punched from a stator material along a punching line having a substantially square shape, and the single cores are stacked to form a square-shaped stator core. In the manufacturing method of the stator core of the motor formed, a step of providing a slit on the periphery of the punching line with respect to the stator material, and after providing the slit, Punching the center of the inner diameter, and when the A phase is a straight line that passes through the center of the inner diameter of the single core and is perpendicular to the periphery of the punching line, the slit has at least the punching line and the A phase. It is characterized in that the opening is connected by the non-punched part that is not punched at the intersection part or in the vicinity of the intersection part.

  In the present invention, the slit is connected to the opening by a non-punched portion that is not punched at least at the intersection of the punching line and the A phase or in the vicinity of the intersection. In this configuration, since the non-punched portion reinforces the rigidity of the stator material applied in the A-phase direction, there is an advantage that the roundness of the single core inner diameter portion can be effectively increased.

  Further, in the method for manufacturing a stator core of a motor according to the present invention, the non-punched portion has all the magnetic poles having rigidity of the stator material applied in a linear direction drawn from the inner diameter center of the single core to the magnetic pole portion. It has a dimension range determined so as to be substantially uniform between the parts.

  In the present invention, the non-punched portion has a dimension range determined so that the rigidity of the stator material applied in the linear direction drawn from the center of the inner diameter of the single core to the magnetic pole portion is substantially uniform among all the magnetic pole portions. Have. As a result, the amount of the magnetic pole portion 35 drawn by punching out the inner diameter portion of the single core is substantially uniform among all the magnetic pole portions, so that the roundness of the single core can be effectively increased.

  An apparatus for manufacturing a stator core of a motor according to the present invention includes a mold capable of forming a slit and a non-punched portion formed in the above-described method for manufacturing a stator core of a motor in a stator material.

  According to the present invention, the slit is connected to the opening by the non-punched portion that is not punched in the vicinity of the intersection with the straight line drawn from the center of the inner diameter of the single core to the magnetic pole portion. The portion suppresses the opening of the slit and reinforces the rigidity of the stator material, and the roundness of the single core inner diameter portion is effectively increased.

Hereinafter, the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by this Example.
In addition, constituent elements of the embodiments described below include those that can be easily replaced by those skilled in the art or those that are substantially the same.

FIG. 1 is an exploded perspective view of a motor having a stator core, and FIGS. 2 to 4 are explanatory views (FIG. 2) showing a manufacturing method of the stator core according to Example 1 of the present invention, and an enlarged view of a main part (FIG. 3) and a flowchart (FIG. 4).
In this method for manufacturing a stator core, a single core 3 is formed by stepwise punching out a stator material 4 made of a band-shaped silicon steel plate (ST1 to ST6). A plurality of the punched single cores 3 are stacked to form the stator core 2 (ST7), and the rotor 1 is inserted through the stator core 2 to assemble the motor 1 (ST8). This method of manufacturing the stator core 2 is characterized in that it effectively suppresses the unbalance of the amount of drawing that occurs between the magnetic pole portions 35 of the single core 3 in the punching process of the single core 3.
Thereby, since the stator core 2 and the single core 3 having high roundness can be formed, there is an advantage that the motor 1 excellent in torque balance can be manufactured.

[manufacturing device]
FIG. 5 is a front view of the stator core manufacturing apparatus according to the first embodiment of the present invention. The manufacturing apparatus 6 is a press machine having a progressive die capable of continuous punching.
The manufacturing apparatus 6 includes a punch plate 61, a die plate 62, guide rails 63 and 63, a guide roller 64, a plurality of punches 65 and 65, and a pilot pin 66. In this manufacturing apparatus 6, a punch plate 61 and a die plate 62 are installed facing each other, and a stator material 4 that is a material of the single core 3 is arranged on the die plate 62. The guide rails 63, 63 are installed facing each other on the die plate 62 and support both edges of the stator material 4. The guide roller 64 also supports both edges of the stator material 4 and sends the stator material 4 into the mold of the manufacturing apparatus 6. The plurality of punches 65 are driven up and down to punch out predetermined portions from the stator material 4 in steps (ST1 to ST6). The pilot pin 66 is inserted into the pilot hole 41 of the stator material 4 in this punching process (ST1 to ST6) and used for positioning the stator material 4 at the time of punching.

[Manufacturing process]
In the stator core manufacturing method of the present invention, first, the stator material 4 is disposed between the punch plate 61 and the die plate 62 of the manufacturing apparatus 6, and both edges thereof are supported by the guide rails 63 and 63. The stator material 4 is fed in the longitudinal direction in the manufacturing apparatus 6 by a feeding device (not shown) provided outside, and a predetermined portion is punched out in stages by a plurality of punches 65 and 65.
In the final stage, the single core 3 is punched out of the stator material 4 (ST6). In this punching process, first, pilot holes 41 and screw holes 31 are opened in the stator material 4 (ST1). The pilot holes 41 are respectively opened outside the four corners of the punching line 45 of the single core 3. The pilot pin 66 is inserted into the pilot hole 41 in each process (ST2 to ST6), and thereby the stator material 4 is positioned in each punching process (ST1 to ST6). The screw holes 31 are respectively opened at the four corners of the punching line 45 of the single core 3. A screw (not shown) for tightening is inserted into the screw hole 31 after the assembly of the stator core 2 (ST7).

  Note that the punching line 45 of the single core 3 refers to a line corresponding to the outline of the single core 3 before punching or the periphery (in the stator core 2, four sides of a substantially square). In the stator core 2, the punching lines 45 have substantially the same width as the stator material 4, and a plurality of the punching lines 45 are continuously arranged in the longitudinal direction of the stator material 4 with almost no gap (see FIG. 2). By arranging the punching lines 45 of the single cores 3 in such an arrangement, the punching process of the single cores 3 can be made more efficient, and the loss of the stator material 4 can be reduced and the yield can be increased.

  Next, the stator material 4 is provided with a slit 42 (ST2). The slit 42 is provided along the punching line 45 of the single core 3. In particular, in the stator core 2, since the single core 3 is substantially square, slits 42 are provided along each side of the square (see FIGS. 2 and 3). Further, the slit 42 is divided into two on each side of the punching line 45, and the entire single core 3 is divided into eight. Note that the features of these slits 42 will be described in detail after the entire method of manufacturing the stator core is described for convenience. Further, these slits 42 are punched at a time by the punch 65 of the manufacturing apparatus 6.

Next, the stator material 4 is provided with the slot portion 32 of the single core 3 (ST3). The slot portion 32 is a portion constituting a slot of the stator core 2. In the first embodiment, the stator core 2 has eight magnetic poles, and eight slot portions 32 are formed for one single core 3 (see FIGS. 2 and 3). These slot portions 32 are formed in an annular arrangement at equal intervals with respect to the inner diameter center of the single core 3.
Next, the stator material 4 is provided with the small inner diameter portion 33 of the single core 3 (ST4). The inner diameter small teeth portion 33 is a portion constituting the inner diameter small teeth of the stator core 2 and is provided along the inner periphery of the arrayed slot portions 32 group.

  Next, the stator material 4 is provided with the inner diameter portion 34 of the single core 3 (ST5). The inner diameter portion 34 is a portion constituting the inner diameter of the stator core 2, and is provided by punching the stator material 4 along the inner periphery of the inner diameter small tooth portion 33 (see FIGS. 2 and 3). As a result, the magnetic pole portion 35 of the single core 3 is formed between the slot portions 32, 32. The magnetic pole part 35 is a part constituting the magnetic pole of the stator core 2, and the same number (eight) magnetic pole parts 35 as the number of the slot parts 32 are formed in the stator core 2.

  Here, in this stator core manufacturing method, a straight line that passes through the center of the inner diameter of the single core 3 and is perpendicular to the opposite side of the single core 3 is called an A phase, and two straight lines that are diagonal lines of the single core 3 are called a B phase ( (See FIG. 3). In the stator core 2, the magnetic pole portions 35 are formed around the center of the inner diameter of the single core 3 at intervals of 45 degrees, and all the magnetic pole portions 35 are formed on the A phase or the B phase.

  Next, the single core 3 is punched from the stator material 4 along the slit 42 (ST6). The punched single core 3 has a substantially square plate shape (see FIG. 2). A plurality of single cores 3 are laminated and fixed by caulking or the like to form stator core 2 (ST7). At this time, the single core 3 is laminated by being rotated 90 degrees in the plane direction. As a result, the dimensional error of each single core 3 is alleviated as a whole of the stator core 2, and in combination with the operational effect produced by the non-punched portion 43 of the slit 42 described later, There is an advantage that the roundness can be increased synergistically. A screw for tightening (not shown) is inserted into the screw hole 31 after the assembly of the stator core 2 (ST7). The stator core 2 is fastened and fastened by this screw. The motor 1 is assembled by winding a coil (not shown) around the magnetic poles of the stator core 2 and inserting the rotor 5 into the inner diameter (ST8). In FIG. 2, the rotor 5 is indicated by a one-dot chain line.

[slit]
In the method for manufacturing a stator core according to the present invention, the slits 42 are provided along the punching lines 45 of the single core 3, and the slits 42 are provided with non-punched portions 43 that connect the openings in a lattice shape. (See FIGS. 2 and 3). In other words, the slit 42 is provided leaving the intersection of the punching line 45 and a straight line (at least the A phase in the stator core 2) drawn from the center of the inner diameter of the single core 3 to the magnetic pole part 35. That is, the stator material 4 is not punched at least at the intersection (non-punched portion) 43 between the A phase and the punching line 45. As a result, the stator material 4 has a blank portion (a portion not punched) having a length range substantially the same in the A-phase direction and the B-phase direction on the outer side in the radial direction of the single core 3 with respect to the magnetic pole portion 35. (See FIG. 3).
Moreover, in this stator core 2, the non-punching part 43 is each provided in the midpoint part of the periphery of the punching line 45 (namely, the substantially square four sides of the single core 3). Thus, a total of eight slits 42 are formed on the entire circumference of the punching line 45, two on each side.

In this stator core manufacturing method, when the inner diameter portion 34 is formed (ST5), each magnetic pole portion 35 is drawn inward in the radial direction by punching, and tensile strain is generated in each magnetic pole portion 35. At this time, the non-punched portion 43 connects the opening portion of the slit 42 to suppress the opening, and reinforces the rigidity of the stator material 4 on the line connecting the center of the inner diameter of the single core 3 and the magnetic pole portion 35. Specifically, the dimension width or dimension range of the non-punched portion 43 is designed so that the rigidity of the stator material 4 in the A-phase direction and the B-phase direction is substantially equal. It should be noted that the design of the non-punched portion 43 can be arbitrarily made within a range obvious to those skilled in the art.
In such a configuration, the amount of the magnetic pole portion 35 drawn when the inner diameter portion 34 is punched (ST5) is made uniform in the A-phase direction and the B-phase direction. Thereby, since the dimensional error in the inner diameter portion 34 of the single core 3 is reduced, there is an advantage that the roundness is improved and the torque balance of the stator core 2 is improved.

According to this method for manufacturing a stator core, the non-punched portion 43 equalizes the amount of pull-in between the magnetic pole portions 35 when the inner diameter portion 34 is punched (ST5). This improves the torque balance of the stator core 2.
In particular, when the single core 3 has a square shape like the stator core 2, the stator material 4 is formed on the A phase and the B phase when the inner diameter portion 34 is punched (ST5). Subject to different internal stresses. In this respect, the stator core manufacturing method is such that the non-punched portion 43 provided on the A phase causes a pull-in amount between the magnetic pole portions 35 on the A phase and the B phase at the time of punching (ST5). Can be effectively made uniform, it is particularly preferable to apply to the square-shaped stator core 2.

Further, in the method for manufacturing the stator core, as described above, a part of the outline of the single core 3 is punched prior to the other components 32 to 34. Then, the internal stress to the inner side in the circumferential direction of the single core 3 generated in the subsequent punching steps (ST3 to ST6) is suppressed.
Accordingly, there is an advantage that the warpage of the single core 3 is suppressed and the parallelism around the single core 3 is increased. This also has the advantage that the roundness of the single core 3 is increased synergistically in combination with the function of the non-punched portion 43 of the slit 42.

In addition, in the conventional method for manufacturing a stator core, when high roundness is required, it is a common general knowledge of those skilled in the art to perform a finishing process that cuts the inner diameter of the stator core after stacking single cores. there were. For this reason, the technique which devised the slit 42 like the manufacturing method of the stator core of this invention has not been implemented yet, and the idea is very novel. In the method for manufacturing a stator core according to the present invention, the single core 3 having a high roundness can be formed only by the punching process (ST1 to ST6) by press working, so that there is an advantage that such finishing work can be omitted.
Moreover, generally advanced technology is required for finishing the inner diameter of the stator core 2. For this reason, many general-purpose motors have a situation in which finishing cannot be performed for both cost and technical reasons. In this respect, according to this method of manufacturing a stator core, the stator core 2 having a high roundness can be formed inexpensively and easily without the need for such finishing, so that its technical value is extremely high. Further, if such finishing is not necessary, there is an advantage that the manufacturing process is shortened and the cost of the product is reduced.

In addition, since the roundness of the single core 3 can be easily increased with a simple configuration, the single core 3 can be formed using a thinner stator material 4. Thereby, since the magnetic flux density of the stator core 2 can be raised, there exists an advantage which can manufacture the motor 1 more excellent in performance easily.
This also stabilizes the dimensional accuracy of the stator core 2, thereby improving the yield and stabilizing the product quality accuracy.

Further, in the conventional method for manufacturing a stator core, in order to increase the roundness of the single core 103, an irregularly shaped punch 165 may be used in punching the inner diameter portion 134 (ST105) (see FIG. 13). In other words, punches having different shapes with different inner diameter dimensions in the A-phase direction and the B-phase direction are made so that the drawn amount of the magnetic pole portion 135 is uniform in the A-phase direction and the B-phase direction after the inner-diameter portion 134 is punched. Adopted. Such an irregularly shaped punch 165 has a problem that it is difficult to determine and adjust its inner diameter.
In this respect, in this method of manufacturing a stator core, the roundness of the single core 3 can be ensured by using the perfect circular punch 65 without using the punch 165 having the irregular shape. There is an advantage that the analysis of the accuracy change of the product in relation can be easily performed. Further, there is an advantage that adjustment of the manufacturing apparatus 6 and conditions for punching can be easily made, and product inspection of the stator core 2 can be facilitated.

Further, the non-punched portion 43 has a function of reinforcing the rigidity of the stator material 4 in the A-phase direction in the stator core 2. Thereby, since the extension of the stator material 4 is suppressed at the time of punching the inner diameter portion 34 (ST5), it is difficult for the manufacturing device 6 to convey the stator material 4 and the stator material 4 is conveyed. There is an advantage that accuracy is improved. In particular, in the method for manufacturing the stator core of the motor, the punch 65 moves up and down at 300 strokes per minute to punch the single core 3. Therefore, if the conveyance accuracy of the stator material 4 is improved, there is an advantage that punching can be stably performed even under such high-speed processing.
Moreover, since punch errors are suppressed by improving the conveyance accuracy, there is an advantage that damage to the punch 65 due to chipping can be prevented. Moreover, since the lifetime of the manufacturing apparatus 6 is extended by this, there exists an advantage which can implement | achieve cost reduction of a product.

In this stator core manufacturing method, the standardized square-shaped stator core 2 has been described as an example. In the stator core 2, since the single core 3 is substantially square, it is particularly difficult to adjust the amount by which the magnetic pole part 35 is drawn when the inner diameter part 34 is punched (ST5) in the A phase direction and the B phase direction. In this respect, in this method of manufacturing a stator core, even with respect to such a square-shaped stator core 2, the amount of pull-in between the magnetic pole portions 35 is effectively made uniform by the non-punched portion 43 of the slit 42. This is particularly preferable.
Further, in the stator core 2, since the single core 3 is substantially square, the punching lines 45 are laid out in a line with the width of the strip-shaped stator material 4 (see FIG. 2). Therefore, there is an advantage that the stator material 4 is less wasted and the yield is improved.
However, the present invention is not limited to this, and the method for manufacturing a stator core may be applied to a round-shaped stator core.

Further, in this method for manufacturing a stator core, a square-shaped stator core 2 having eight magnetic poles (hereinafter referred to as an eight-divided square stator core) has been described as an example. In the 8-divided square stator core 2, all the magnetic pole portions 35 are formed on either the A phase or the B phase (see FIG. 3). Therefore, there are only two types of pull-in amounts generated in the magnetic pole portion 35 when the inner diameter portion 34 is punched (ST5) in the A-phase direction and the B-phase direction. The width dimension of the non-punched portion 43 is adjusted so that the pulling amount generated in the A phase side magnetic pole portion 35 when the inner diameter portion 34 is punched (ST5) is matched with the pulling amount generated in the B phase side magnetic pole portion 35. Thus, there is an advantage that the roundness of the inner diameter portion 34 can be easily made uniform. That is, since there are only two types of pull-in conditions to be adjusted, the A-phase side and the B-phase side, the adjustment is easy. Therefore, it is more preferable that the method for manufacturing the stator core is applied to the 8-divided square stator core 2.
However, the present invention is not limited to this, and the method for manufacturing a stator core may be applied to a stator core that is divided into six parts, sixteen parts, or other plural parts.

  In the method for manufacturing the stator core, the stepping motor has been described as an example. A stepping motor is required to have a particularly high roundness as compared with other stator cores. Therefore, it is particularly preferable that this method for manufacturing a stator core is applied to a stepping motor. However, the present invention is not limited to this, and the method of manufacturing a stator core may be applied to a stator core of another motor.

  6 and 7 are explanatory views showing a method for manufacturing the stator core according to the second embodiment of the present invention. In the same figure, the same code | symbol is attached | subjected to the component same as the manufacturing method of the stator core of the said Example 1, and the description is abbreviate | omitted. This figure shows an example in which this method for manufacturing a stator core is applied to a six-part square stator core.

  In this six-divided rectangular stator core 2, the layout of the single core 3 with respect to the stator material 4 has, for example, the configuration shown in FIG. 6 or FIG. In FIG. 6, a pair of opposing magnetic pole portions 35, 35 among the three pairs of magnetic pole portions 35, 35 of the single core 3 are arranged in the width direction of the stator material 4. In FIG. 7, a pair of opposing magnetic pole portions 35, 35 are arranged in the longitudinal direction of the stator material 4. Further, the other two pairs of opposing magnetic pole portions 35, 35 are arranged in a direction inclined by 60 degrees with respect to the earlier opposing magnetic pole portions 35, 35 in FIGS.

  Here, in the method for manufacturing the stator core according to the second embodiment, a straight line that passes through the center of the inner diameter of the single core 3 and is perpendicular to the periphery of the punching line 45 is referred to as an A phase. In FIG. 6, this A phase becomes the width direction of the stator material 4, and becomes a longitudinal direction in FIG. A straight line that passes through the center of the inner diameter of the single core 3 and is inclined by 60 degrees with respect to the A phase is referred to as a B phase.

  In this stator core manufacturing method, the stator material 4 is provided with a plurality of slits 42 along the punching lines 45 of the single core 3. Further, the stator material 4 has a non-punched portion 43 on the punching line 45. The non-punched portion 43 is a portion not punched by the punch 65 and is provided at least on the A phase. In other words, the opening of the slit 42 is connected by the non-punched portion 43 on the A phase. Thereby, the rigidity of the stator material 4 applied in the A phase direction is reinforced. Further, the non-punched portion 43 is designed with a dimensional width or a dimensional range so that the rigidity of the stator material 4 in the A-phase direction and the B-phase direction is substantially equal.

  In this method of manufacturing a stator core, the magnetic pole portion 35 is drawn toward the inner diameter center when the inner diameter portion 34 is punched (ST5). At this time, in the stator material 4, the rigidity in the A-phase direction is reinforced by the non-punched portion 43 and the rigidity in the A-phase direction and the B-phase direction is substantially equal. Is made uniform in the A phase direction and the B phase direction. Thereby, since the roundness of the single core 3 is improved, there is an advantage that the torque balance of the motor 1 can be increased.

  In particular, in the six-divided rectangular stator core 2, all the magnetic pole portions 35 are formed in either the A-phase direction or the B-phase direction of the stator material 4 (see FIG. 6). The single core 3 is formed symmetrically in the two directions in the B phase direction. Therefore, there are only two types of pulling amounts of the magnetic pole part 35 by punching the inner diameter part 34 (ST5) in the A-phase direction and the B-phase direction. For this reason, for example, by adjusting the width dimension of the non-punched portion 43 in the A-phase direction, the pull-in amount generated in the magnetic pole portion 35 in the A-phase direction and the pull-in amount generated in the magnetic pole portion 35 in the B-phase direction. Can be easily made uniform. Thereby, there exists an advantage which can raise the roundness of the single core 3 effectively.

  In the method of manufacturing the stator core 2, the layout of the single core 3 is configured as shown in FIG. In such a configuration, only one set of the magnetic pole portions 35, 35 among the three sets of opposing magnetic pole portions 35, 35 is arranged on the A phase (see FIGS. 6 and 7). Here, the magnetic pole portions 35 arranged on the B phase have a smaller pull-in amount when the inner diameter portion 34 is punched (ST5) than the magnetic pole portions 35 on the A phase. Further, on the A phase, the rigidity of the stator material 4 can be reinforced by the non-punched portion 43 on the punching line 45, and the amount of the drawn material can be reduced by adjusting the width dimension of the non-punched portion 43. It can adjust easily with respect to the magnetic pole part 35 on a phase. Therefore, the layout is preferable in that the roundness of the single core 3 can be easily increased. However, the present invention is not limited to this, and other layouts may be adopted within a range obvious to those skilled in the art.

  Moreover, in this manufacturing method of the stator core 2, the non-punched portion 43 is provided at least on the A phase, and there is no limitation on the B phase. This is because the magnetic pole portions 35 arranged on the B phase have a smaller pull-in amount when the inner diameter portion 34 is punched (ST5) than the magnetic pole portions 35 on the A phase. However, the present invention is not limited thereto, and the non-punched portion 43 may be provided on the B phase. For example, as shown in FIG. 8, the slit 42 is not applied to the B phase by shortening the length of the slit 42 or the like at the portion where the punching line 45 intersects the B phase. Thereby, the non-punching part 43 can be formed in the intersection part of the punching line 45 and B phase. According to such a configuration, there is an advantage that the rigidity of the stator material 4 can be reinforced even on the B phase.

  9 and 10 are explanatory views showing a modification of the method for manufacturing the stator core 2 shown in FIG. In these drawings, the same components as those in the method for manufacturing the stator core 2 of the first and second embodiments are denoted by the same reference numerals, and the description thereof is omitted. This method of manufacturing the stator core 2 is characterized in that the shape of the non-punched portion 43 is deformed.

  In this modification, as shown in FIG. 9, the stator material 4 is provided with slits 42 along the punching line 45 of the single core 3. The slit 42 is provided with non-punched portions 43, 43 in the vicinity of the intersection of the punched line 45 and a straight line drawn from the center of the inner diameter of the single core 3 to the magnetic pole portion 35. The opening is connected by. Here, the non-punched portions 43 and 43 have a hole 46 formed in the middle thereof by punching the stator material 4 in a circular shape. The hole 46 is provided at the intersection of the punch line 45 and a straight line (for example, A phase) drawn from the center of the inner diameter of the single core 3 to the magnetic pole part 35. In other words, in this configuration, the non-punched portion 43 of the slit 42 is provided at a position deviated from the intersection of the punched line 45 and the straight line drawn from the center of the inner diameter of the single core 3 to the magnetic pole portion 35. The hole 46 may have a polygonal shape or a rectangular slit (see FIG. 10).

  In such a configuration, the non-punched portions 43, 43 support the stator material 4 in a substantially Y shape on the line connecting the inner diameter center of the single core 3 and the magnetic pole portion 35, and suppress the opening of the slit 42. The rigidity of the stator material 4 is reinforced. Thereby, the amount by which the magnetic pole part 35 is drawn by the punching of the inner diameter part 34 (ST5) is suppressed. Therefore, even with such a configuration, there is an advantage that the roundness of the single core 3 can be increased by a combination with the method for manufacturing the stator core 2 according to the first embodiment or the second embodiment.

It is a disassembled perspective view of the motor which has a stator core. It is explanatory drawing which shows the manufacturing method of the stator core concerning Example 1 of this invention. It is a principal part enlarged view which shows the manufacturing method of the stator core concerning Example 1 of this invention. It is a flowchart which shows the manufacturing method of the stator core concerning Example 1 of this invention. It is a front view which shows the manufacturing apparatus of the stator core concerning Example 1 of this invention. It is explanatory drawing which shows the manufacturing method of the stator core concerning Example 2 of this invention. It is explanatory drawing which shows the manufacturing method of the stator core concerning Example 2 of this invention. FIG. 8 is an explanatory view showing a modification of the method for manufacturing the stator core shown in FIGS. 6 and 7. It is explanatory drawing which shows the modification of the manufacturing method of the stator core described in FIG. It is explanatory drawing which shows the modification of the manufacturing method of the stator core described in FIG. It is explanatory drawing which shows the manufacturing method of the conventional stator core. It is a principal part enlarged view which shows the manufacturing method of the conventional stator core. It is a top view which shows the punch shape of the manufacturing apparatus of the conventional stator core.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor 2 Stator iron core 3 Single core 4 Stator material 5 Rotor 6 Manufacturing apparatus 31 Screw hole 32 Slot part 33 Inner diameter small tooth part 34 Inner diameter part 35 Magnetic pole part 41 Pilot hole 42 Slit 43 Non-punching part 45 Punching line 46 Slit 61 Punch plate 62 Die plate 63 Guide rail 64 Guide roller 65 Punch 66 Pilot pin

Claims (5)

In a method for manufacturing a stator core of a motor, in which a single core is punched from a stator material along a punching line, and the single core is stacked to form a stator core.
Providing a slit on the punching line for the stator material;
And after punching the inner diameter center of the single core from the stator material after providing the slit, and
The motor is characterized in that the slit is connected to the opening by a non-punched portion that is not punched at or near the intersection with the straight line drawn from the inner diameter center of the single core to the magnetic pole portion. Method for manufacturing the stator core of the machine. In a method for manufacturing a stator core of a motor, in which a single core is punched from a stator material along a punching line, and the single core is stacked to form a stator core.
Providing a slit on the punching line for the stator material;
And after punching the inner diameter center of the single core from the stator material after providing the slit, and
The stator material has a non-punched portion that is not punched at an intersection portion of the punching line and a straight line drawn from the inner diameter center of the single core to the magnetic pole portion or in the vicinity of the intersection portion. To manufacture a stator core for a motor. In a method for manufacturing a stator core of a motor, in which a single core is punched from a stator material along a punching line having a substantially rectangular shape, and the single core is stacked to form a square-shaped stator core.
Providing a slit on the periphery of the punching line for the stator material;
And after punching the inner diameter center of the single core from the stator material after providing the slit, and
When a straight line passing through the center of the inner diameter of the single core and perpendicular to the periphery of the punching line is the A phase, the slit is at least at the intersection of the punching line and the A phase or in the vicinity of the intersection. A method of manufacturing a stator core of a motor, wherein the opening is connected by a non-punched portion that is not punched.   The non-punched portion has a dimension range determined so that the rigidity of the stator material applied in the linear direction drawn from the center of the inner diameter of the single core to the magnetic pole portion is substantially uniform among all the magnetic pole portions. A method for manufacturing a stator core of a motor according to any one of claims 1 to 4.   An apparatus for manufacturing a stator core of a motor having a mold capable of forming a slit and a non-punched portion formed in the stator material of the motor according to any one of claims 1 to 4 in a stator material. .

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