JP3972797B2 - Stator core winding method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stator core winding method and apparatus for winding a belt-shaped material to manufacture a stator core.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a method for manufacturing a stator core is known in which a strip-shaped thin plate having notches formed at equal intervals on one end side is wound spirally. In this manufacturing method, by reducing the plate thickness on the other end side of the linear strip-shaped thin plate toward the end edge, the other strip side becomes longer than the one end side, and the strip-shaped thin plate is bent substantially spirally (for example, , Patent Document 1 and Patent Document 2).
[0003]
[Patent Document 1]
JP 2000-224817 A (page 4-6, FIG. 1-7)
[Patent Document 2]
JP 2001-54261 A (page 4-7, FIG. 1-5)
[0004]
[Problems to be solved by the invention]
By the way, in the stator core manufacturing methods disclosed in Patent Document 1 and Patent Document 2 described above, it is necessary to determine the number of windings of the strip-shaped thin plate in advance in order to manufacture the stator core, but in general, the thickness of the strip-shaped thin plate is measured. The number of windings of the strip-shaped thin plate was determined by dividing the thickness of the stator core by the measured thickness of the strip-shaped thin plate. When the number of windings of the strip-shaped thin plate is determined in this way, the number of windings is reduced when the strip-shaped thin plate is thick, so the influence of the error included in the measurement result of the thickness of the strip-shaped thin plate is small, but the strip-shaped thin plate is thin. In this case, the number of windings increases, and the accumulated value of the error included in the measurement result of the thickness of the strip-shaped thin plate becomes large. Cannot be within the predetermined design range, and the necessary dimensions cannot be obtained.
[0005]
The present invention has been created in view of the above points, and an object thereof is to provide a stator core winding method and apparatus that can increase the accuracy of the stator core stacking thickness.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problems, the stator core winding method of the present invention is configured to reduce the stack thickness of a laminate formed by winding a band-shaped material in order to wind the band-shaped material in a spiral shape to form a stator core. The step of measuring, the step of calculating the plate thickness of the strip material by dividing the measured stack thickness by the number of windings of the strip material when forming the laminate, and the design stack thickness of the stator core, And dividing the calculated plate thickness to determine the number of windings of the strip material winding operation from the next time.
[0007]
In addition, the stator core winding device of the present invention includes a winding unit that spirally winds a belt-shaped material to form a stacked body, and a stack thickness measuring unit that measures the stacked thickness of the stacked body formed by the winding unit. The thickness of the laminate measured by the stack thickness measuring means is divided by the number of windings of the strip when the laminate is formed, thereby calculating the thickness of the strip and calculating the thickness Based on the result, there is provided a winding control means for determining the number of windings of the belt-like material when the laminated body is formed next time.
[0008]
Since the stack thickness of the laminate around which the strip material is wound is measured, and the number of windings of the strip material from the next time is determined based on this measurement result, the stator core can be used regardless of the thickness of the strip material and the number of windings. It becomes possible to increase the accuracy of the stacking thickness.
Further, when the stator core is manufactured by pressing the laminated body in the direction in which the strips wound in a spiral are laminated, the above-described measurement of the stack thickness of the laminated body is performed by applying the same pressure as the stator core production. It is desirable to be performed in the state added to the body. Thereby, it becomes possible to obtain | require the board | plate thickness of a strip | belt-shaped material on the same conditions as actually manufacturing a stator core, and can raise the precision of the stack thickness of a stator core further.
[0009]
In addition, when the stator core is manufactured by pressurizing the laminated body in the direction in which the strips wound in a spiral are laminated, the above-described measurement of the stack thickness of the laminated body is performed at a lower pressure than when the stator core is manufactured. In addition to the laminate, the step of determining the number of windings of the strip material from the next time is determined by dividing the design thickness of the stator core by the calculated plate thickness when the stator core is manufactured. It is desirable to carry out by multiplying a predetermined correction coefficient set based on the pressure to be applied and the pressure to be applied at the time of measuring the stack thickness. As a result, it is possible to simplify the apparatus configuration necessary for measuring the stack thickness of the laminate, and to increase the accuracy of the stack thickness of the stator core.
[0010]
Moreover, it is preferable that the step of determining the number of windings described above is performed using a result obtained by performing the step of measuring the stack thickness of the laminated body a plurality of times. As a result, it is possible to prevent errors from increasing due to sudden factors and to stably increase the accuracy of the stator core stacking thickness.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a stator core winding device according to an embodiment to which the present invention is applied will be described in detail with reference to the drawings.
FIG. 1 is a diagram illustrating an overall configuration of a stator core winding device according to the present embodiment. A stator core winding device 100 shown in FIG. 1 includes a strip-shaped thin plate guide 10, a winding drive motor 12, a winding unit 14, a cutting unit 16, a winding workpiece unloading unit 18, a stack thickness measuring unit 20, and a winding control device 22. It is configured to include.
[0012]
The strip-shaped thin plate guide 10 is for introducing a strip-shaped thin plate 90 as a strip-shaped material introduced from one end side to a position in contact with the side surface of the cylindrical roller 30. The strip-shaped thin plate 90 has a comb tooth shape having irregularities corresponding to the slots of the stator core, and is introduced from a previous step (for example, a press step for forming a comb tooth shape).
[0013]
The winding unit 14 includes a cylindrical roller 30 and a side regulation guide 32 disposed around the cylindrical roller 30, and performs an operation of winding the strip-shaped thin plate 90 introduced via the strip-shaped thin plate guide 10. The strip-shaped thin plate 90 is sandwiched and rolled in the vicinity of the discharge port of the strip-shaped thin plate guide 10 to deform the cross-section into a trapezoidal shape, and the thickness of the strip-shaped thin plate 90 gradually decreases from one end to the other end. Two rolling rollers 40 and 42 are provided. By passing these rolling rollers, the strip-shaped thin plate 90 is sent to the winding unit 14 in a state of being spirally bent.
[0014]
The cylindrical roller 30 of the winding unit 14 is rotationally driven by the winding drive motor 12. The rotational speed at this time is synchronized with the speed at which the strip-shaped thin plate 90 is introduced through the strip-shaped thin plate guide 10. Further, the number of windings of the strip-shaped thin plate 90 wound up by the winding unit 14 is set by controlling the operation time and the rotation angle of the winding drive motor 12 that rotates at a predetermined speed. A method for determining the number of windings will be described later.
[0015]
The cutting unit 16 cuts the strip-shaped thin plate 90 wound up by a predetermined number of windings. The take-up work take-out unit 18 takes out a work 92 constituted by a spiral strip-shaped thin plate 90 that has been wound and cut by a predetermined number of windings. The workpiece 92 is simply a laminated body obtained by winding a spiral strip-shaped thin plate 90 by a predetermined number of windings, and the outer peripheral surface is partially applied in a state where the laminated body is pressed in the stacking direction of the strip-shaped thin plate 90 in a subsequent process. A stator core is obtained by welding to the core.
[0016]
The stack thickness measuring unit 20 measures the stack thickness of the workpiece 92 (the thickness in the stacking direction of the strip-shaped thin plates 90). There are several possible methods for measuring. For example, a method of mechanically sandwiching the workpiece 92 and measuring the stacking thickness, a method of optically measuring the stacking thickness, and the like can be considered. As the design value, the stacking thickness after being formed as the stator core is defined, and therefore it is necessary to reproduce the same pressure state as when the stator core was manufactured and perform the measurement by the stacking thickness measuring unit 20. For this reason, the stacking thickness measurement unit 20 has an integral or separate pressurization device 20A, and the pressurization device 20A reproduces a pressurization state equivalent to that at the time of manufacturing the stator core.
[0017]
The winding control device 22 has a configuration as a computer including a CPU, a ROM, a RAM, and the like, and controls the overall operation of the stator core winding device by executing an operation program stored in the ROM or the like. Further, the winding control device 22 sets the number of windings when the workpiece 92 is manufactured next, based on the measurement result of the stacked thickness measuring unit 20. Specifically, the winding control device 22 determines the workpiece 92 based on the measurement result (stack thickness value) of the stack thickness measuring unit 20 and the number of windings when the workpiece 92 used for this measurement is manufactured. Is calculated, and the design value of the thickness of the stator core is divided by the calculated plate thickness to determine the next winding number. Since the design value has an allowable range, when there are a plurality of winding numbers included in the allowable range, for example, the winding number close to the median value of the design is adopted.
[0018]
The winding drive motor 12, the winding unit 14, and the cutting unit 16 described above correspond to the winding means, the stack thickness measuring unit 20 corresponds to the stack thickness measuring means, and the winding control device 22 corresponds to the winding control means.
The stator core winding device of the present embodiment has such a configuration, and the operation thereof will be described next.
[0019]
FIG. 2 is a flowchart showing an operation procedure of the stator core winding device. First, the winding control device 22 reads a target value of the number of windings stored in the RAM or the like (step 100). This target value is set using the work 92 formed by the previous winding, and details of the setting method will be described later.
[0020]
Next, the winding control device 22 rotationally drives the winding drive motor 12 and starts an operation of winding the strip-shaped thin plate 90 in a spiral manner by the winding unit 14 (step 101). As described above, the strip-shaped thin plate 90 is rolled by the rolling rollers 40 and 42 in parallel with the winding operation.
[0021]
Next, the winding control device 22 determines whether or not the number of windings has reached the target value read in Step 100 (Step 102). If not, a negative determination is made, and this determination process is repeated while continuing the winding operation. When the number of windings reaches the target value, an affirmative determination is made in the determination in step 102, and the winding control device 22 stops the winding driving motor 12 and ends the winding operation by the winding unit 14. (Step 103).
[0022]
Next, the winding control device 22 sends an instruction to the cutting unit 16 to cut a predetermined position of the strip-shaped thin plate 90 wound spirally (step 104). In this way, a workpiece 92 is formed as a laminate in which the strip-shaped thin plate 90 is wound up for a predetermined number of windings, and the workpiece 92 is placed at a predetermined position in the vicinity of the stacking thickness measurement unit 20 by the winding workpiece take-out unit 18. .
[0023]
Next, the winding control device 22 increases the thickness of the workpiece 92 by the stack thickness measuring unit 20 while maintaining a state in which the workpiece 92 is pressurized in the stacking direction of the thin strip 90 using the pressurizing device 20A. Measurement is performed (step 105), and the measurement result (stacked thickness) is divided by the number of windings when the workpiece 92 is manufactured to calculate the thickness of the thin strip 90 (step 106).
[0024]
Next, the winding control device 22 divides the design value of the stack thickness of the stator core by the plate thickness of the strip-shaped thin plate 90 calculated in step 106 to determine the number of windings in the next winding operation of the strip-shaped thin plate 90. (Step 107). Thereafter, the take-up control device 22 takes out the work 92 using the take-up work take-out unit 18 (step 108). The taken-out workpieces 92 are transferred each time after the stator core is manufactured, or after being stored until a predetermined number is accumulated. In this manner, a series of procedures for manufacturing the workpiece 92 by winding the strip-shaped thin plate 90 by a predetermined number of windings is completed.
[0025]
In this way, the stack thickness of the workpiece 92 that has actually wound the strip-shaped thin plate 90 is measured, and the number of windings for the next workpiece 92 is determined based on the measurement result, and the strip-shaped thin plate 90 is thin. Even when the number of windings is large, the measurement error of the sheet thickness of each strip-shaped thin plate 90 is not accumulated by the number of windings, so the accuracy of the stator core stacking can be increased. become.
[0026]
In particular, when the stator core is manufactured by pressurizing the workpiece 92 in the direction in which the strip-shaped thin plates 90 wound in a spiral are stacked, the workpiece 92 is measured for the thickness of the workpiece 92 by measuring the stacking thickness of the workpiece 92. Therefore, the thickness of the strip-shaped thin plate 90 can be obtained under the same conditions as when the stator core is actually manufactured, and the accuracy of the stack thickness of the stator core can be further increased.
[0027]
In addition, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention. For example, in the above-described embodiment, the thickness of the workpiece 92 is measured every time the strip-shaped thin plate 90 is wound to manufacture the workpiece 92, and the number of windings in the next manufacturing of the workpiece 92 is determined. The determination of the number of windings is not necessarily performed every time, and may be performed at a predetermined interval. For example, in addition to the case where the winding number determination process is performed once every predetermined number of times, this winding number determination process may be performed when the production lot of the strip-shaped thin plate 90 is changed. Alternatively, when one long (for example, several hundred m) strip-shaped thin plate 90 is carried in a wound state, the strip-shaped thin plate 90 is pulled out from the winding end side and the stator core winding device 100 shown in FIG. However, the winding number determination process described above may be performed at each of the winding end point, the substantially intermediate point, and the winding start point.
[0028]
In the above-described embodiment, the number of windings is determined based on the result of measuring the stack thickness of the workpiece 92 once. However, using the measurement result twice or three times, that is, a plurality of times. The number of windings may be determined by averaging the measurement results. In this case, the winding control device 22 may calculate the moving average of the plate thickness of the strip-shaped thin plate 90 based on the measurement result of two times or three times and determine the number of windings. Accordingly, it is possible to prevent an increase in error due to an unexpected factor (for example, mixing of foreign substances) and to stably improve the accuracy of the stator core stacking thickness.
[0029]
Further, in the above-described embodiment, the pressurization state at the time of manufacturing the stator core is reproduced also at the time of measuring the stack thickness of the workpiece 92, but the pressing force at the time of measuring the stack thickness may be lowered. The lower the applied pressure, the greater the stacking thickness of the workpieces 92 and the greater the thickness of the strip-like thin plate 90 even if the number of windings of the strip-like thin plate 90 is the same. A predetermined correction coefficient determined based on the pressure at the time of measuring the stacking thickness 92 is applied to the plate thickness so as to remove the influence of the pressure difference. By reducing the applied pressure at the time of measuring the stack thickness, the device configuration of the pressurizing device 20A can be simplified.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating an overall configuration of a stator core winding device according to an embodiment.
FIG. 2 is a flowchart showing an operation procedure of the stator core winding device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Strip | belt-shaped thin plate guide 12 Winding drive motor 14 Winding unit 16 Cutting unit 18 Winding work taking-out unit 20 Stacking thickness measurement unit 20A Pressurizing device 22 Winding control apparatus 90 Band-shaped thin plate 92 Work 100 Stator core winding device

Claims (3)

A stator core winding method for forming a stator core by winding a strip material in a spiral shape,
Measuring the stack thickness of the laminate formed by winding up the strip;
Calculating the thickness of the strip by dividing the measured thickness by the number of windings of the strip at the time of forming the laminate;
Dividing the design stack thickness of the stator core by the calculated plate thickness to determine the number of windings of the strip material winding operation from the next time;
I have a,
The stator core is manufactured by pressurizing the laminated body in a direction in which the belt-like materials wound in a spiral are laminated,
The measurement of the pile thickness of the laminate, the stator core winding method according to performed said Rukoto in a state where the same pressure as when the stator core manufactured was added to the laminate. A stator core winding method for forming a stator core by winding a strip material in a spiral shape,
Measuring the stack thickness of the laminate formed by winding up the strip;
Calculating the thickness of the strip by dividing the measured thickness by the number of windings of the strip at the time of forming the laminate;
Dividing the design stack thickness of the stator core by the calculated plate thickness to determine the number of windings of the strip material winding operation from the next time;
Have
The stator core is manufactured by pressurizing the laminated body in a direction in which the belt-like materials wound in a spiral are laminated,
Measurement of the stack thickness of the laminate is performed by applying a lower pressure to the laminate than when the stator core was manufactured,
The step of determining the number of winding operations for the winding operation of the strip material from the next time on is a value obtained by dividing the design stack thickness of the stator core by the calculated plate thickness and the pressure applied when the stator core is manufactured. A stator core winding method characterized by being performed by multiplying a predetermined correction coefficient set based on a pressure applied when measuring a stack thickness of a laminate . In claim 1 or 2,
The step of determining the number of windings is performed using a result obtained by performing the step of measuring the stack thickness of the laminated body a plurality of times.

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