CN114783758B - Transformer core lamination punching calculation method - Google Patents

Transformer core lamination punching calculation method Download PDF

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Publication number
CN114783758B
CN114783758B CN202210479485.1A CN202210479485A CN114783758B CN 114783758 B CN114783758 B CN 114783758B CN 202210479485 A CN202210479485 A CN 202210479485A CN 114783758 B CN114783758 B CN 114783758B
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sheet
punching
center
stage
column
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CN114783758A (en
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平阳乐
姜良刚
王新刚
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Shandong Electric Group Digital Technology Co ltd
Shandong Electrical Engineering and Equipment Group Co Ltd
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Shandong Electric Group Digital Technology Co ltd
Shandong Electrical Engineering and Equipment Group Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0206—Manufacturing of magnetic cores by mechanical means
    • H01F41/0233—Manufacturing of magnetic circuits made from sheets

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  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)

Abstract

The invention provides a method for calculating punching holes of iron core laminations of a transformer, which is characterized in that the punching holes of an upper iron yoke are canceled when a frame iron core is not overlapped with the upper iron yoke, one punching hole is added to one end of each of a core column sheet and a side column sheet, which is close to the upper iron yoke, and the situation that the side column sheets need to be spliced is fully considered.

Description

Transformer core lamination punching calculation method
Technical Field
The invention relates to the technical field of transformers, in particular to a punching calculation method for a transformer core lamination.
Background
After the transformer iron core is overlapped, the coil assembly is needed to be sleeved, and the prior art usually removes an upper iron yoke of the iron core, namely 'iron pulling'. And (3) sleeving the coil assembly on the core column or the side column, and then inserting the upper iron yoke lamination back piece by piece, namely 'iron inserting'. The process of 'pulling out iron' and 'inserting iron' not only consumes manpower and working hours, reduces production efficiency and increases production cost, but also easily causes bending or damage of silicon steel sheets in the process, thereby increasing no-load loss of the iron core, and therefore, the transformer iron core is preferably produced in a production mode of not overlapping an iron yoke. For the frame type iron core, because the stepping mode and the sheet shape are different from those of the column type iron core, the lower iron yoke sheet, the core column and the side column sheet are not mutually restrained when the iron yoke is not overlapped, so that the core column sheet and the side column sheet are difficult to position during overlapping, the problems of skew of the core column sheet or the side column sheet, error in overlapping size and the like can be caused, and a certain auxiliary positioning method is needed.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a transformer core lamination punching calculation method, which cancels punching of an upper iron yoke, adds one punching on the same horizontal height of a core column sheet and a side column sheet of a frame type iron core, which are close to one end of the upper iron yoke, wherein the punching is used for positioning the core column sheet and the side column sheet, so that the core column sheet and the side column sheet are prevented from being skewed and misplaced, and in actual production, the specific position of each punching is required to be obtained, so that the punching can be accurately carried out when a silicon steel sheet is cut.
In order to solve the technical problems, the invention adopts the following technical scheme: a method for calculating punching holes of iron core lamination of transformer includes adding a punching hole on same level of iron core and side column piece near one end of iron yoke when iron yoke is not overlapped on frame iron core, canceling punching hole of iron yoke, calculating out specific position of punching hole on each stage of iron core and side column piece by combining known data, forming left and right core column pieces as center column piece and forming left and right side column pieces as side column piece. The punching calculation method for the core column sheet and the side column sheet when the frame type iron core is not overlapped with the iron yoke comprises the following steps:
s1, collecting known data required for calculating punching positions: iron core window height H 0 The step number n, the step amount p, the iron core stage number x and the sheet width B of each stage of the upper iron yoke and the lower iron yoke Yoke i I=1, 2,.. X, side column each stage tab width B Side i I=1, 2,.. X, stem each stage tab width B Heart i I=1, 2,..x, yoke internal step delta i I=1, 2,..x, side column inner step delta i I=1, 2,..x, side column outer level difference epsilon i ,i＝1,2,...,x；
S2, determining the vertical distance D from the punching center to the upper edge of the upper yoke main stage and the punching quantity k, wherein the value range of D is 300mm-600mm, and the calculation formula of k is as follows:
k＝2m+2 (1)，
wherein m is the number of stems;
s3, calculating the vertical distance H from the punching center to the window height center line, wherein the calculation formula of H is as follows:
H＝H 0 /2+B yoke 1 -D (2)；
S4, calculating the specific positions of all punched holes, punching holes of each stage on the central line of the final-stage lamination for convenient positioning, and punching holesThe positions are represented by the combination of the vertical distance L from the punching center to the center line end point of the trapezoid sheet and the offset distance w between the center line of each stage and the center line of the final stage, wherein L comprises the distance L+ between the punching center and the center line end point in the stepping direction and the distance L-between the punching center and the center line end point in the stepping direction, and w comprises the offset distance w between the center line of each stage of the mandrel and the center line of the final stage Heart shape And offset distance w between each level center line and final level center line of side column Side by side ；
Wherein S4 includes:
s41, when L+ is close to one end of the upper iron yoke, the calculation method is to subtract the distance H from the punching center to the window height center line from the lower edge of the main stage of the upper iron yoke, add half of the sheet width and the accumulated sum of the yoke inner level differences, and when L-is close to one end of the lower iron yoke, the calculation method is to add the sheet width and twice of the accumulated sum of the yoke inner level differences to the window height, add the height of a joint generated by a stepping structure, and subtract L+; when L+ is close to one end of the lower iron yoke, the corresponding L-is close to one end of the upper iron yoke, at this time, L-is calculated firstly, the calculation method is that the distance from the lower edge of the main stage of the upper iron yoke to the central line of the window height is subtracted by the distance H from the punching center to the central line of the window height, the accumulated sum of half of the width of an upper sheet shape and the inner level difference of the yoke is added, the height of a joint generated by a stepping structure is added, the accumulated sum of the width of the window shape and the inner level difference of the yoke is added, the height of the joint generated by the stepping structure is added, and then L-is subtracted;
s42, eliminating the influence of the upper and lower yokes and the end of the side column in two stages, correcting the calculation method in S41, and superposing the difference value between the side column shape width and the core column shape width in L+ when L+ is close to one end of the upper yoke, and superposing twice the difference value between the side column shape width and the core column shape width in L-; when L+ is close to one end of the lower iron yoke, the difference value of the side column sheet-shaped width and the core column sheet-shaped width is overlapped in L-, and the difference value of the side column sheet-shaped width and the core column sheet-shaped width is overlapped in L+ by two times;
s43, the stem plates are aligned at one side of the frame-type oil duct, w Heart shape The calculation method of (1) is that one half of the width of each stage of heart column sheet shape is subtracted by one half of the width of the last stage heart column sheet shape; w (w) Side by side The calculation method of (a) is to remove the current stage, then subtracting half of the accumulated sum of the yoke outer differences of each stage from half of the accumulated sum of the yoke inner differences of each stage.
Specifically, in S4, the distance L between the center of the q-th stacking punching of the i-th left column sheet and the end point of the median line in the stepping direction Left heart +i The calculation formula of (2) is as follows:
distance L between the (q) th stacking punching center of the (i) th left column sheet and the neutral line end point in the stepping-down direction Left heart-i The calculation formula of (2) is as follows:
distance L between the (q) th stacking punching center of the (i) th right column sheet and the neutral line end point in the stepping-down direction Right heart-i The calculation formula of (2) is as follows:
distance L between the (q) th stacking punching center of the (i) th right column sheet and the neutral line end point in the stepping direction Right heart +i The calculation formula of (2) is as follows:
distance L between the center of the q-th stacking punching of the i-th left side column sheet and the neutral line end point in the stepping-down direction Left side-i The calculation formula of (2) is as follows:
distance L between the center of the q-th stacking punching of the i-th left side column sheet and the end point of the median line in the stepping direction Left side +i The calculation formula of (2) is：
Distance L between the center of the q-th stacking punching of the i-th right column sheet and the end point of the median line in the stepping direction Right side +i The calculation formula of (2) is as follows:
distance L between the center of the q-th stacking punching of the i-th right column sheet and the neutral line end point in the stepping-down direction Right side-i The calculation formula of (2) is as follows:
in formulas (3) to (10), i=1, 2, x, q=1, 2, n;
offset distance w between center line of ith stage core column sheet and center line of last stage Heart i The calculation formula of (2) is as follows:
w heart i ＝B Heart x /2-B Heart i /2 (11)，
Wherein B is Heart x Is the final-stage heart-post sheet-shaped width, B Heart i Is the width of the ith-level heart column sheet;
offset distance w between ith side column piece central line and last stage central line Side i The calculation formula of (2) is as follows:
in formulas (11) to (12), i=1, 2,..x.
Further, the calculation method of L in the formulas (3) to (10) is applicable to the counterclockwise stepping direction, and when the stepping direction is clockwise, each formula is corrected according to the stepping direction and the stepping amount.
Further, when the calculation result of w is positive, the center line of the trapezoid sheet is used as a dividing line, the trapezoid sheet is punched on the short side, and when w is negative, the trapezoid sheet is punched on the long side.
Further, when the side column sheets need to be spliced, a positioning hole is punched on the spliced side column sheets, and the punching calculation method on the spliced sheets comprises the following steps:
a1, determining the stage y of the side column sheet to be spliced, and collecting known data required for calculating the punching position on the spliced sheet: iron core window height H 0 The step number n, the step amount p, the iron core stage number x and the sheet width B of each stage of the upper iron yoke and the lower iron yoke Yoke i I=1, 2,.. X, side column each stage tab width B Side i I=1, 2,..x, yoke internal step delta i ,i＝1,2,...,x；
A2, determining the sheet-shaped width of the splicing sheet, and splicing two side column sheets, wherein the width of the side column outer side sheet is B 1i The width of the inner side piece of the side column is B 2i And has B 1i +B 2i ＝B Side i Where i=1, 2..y, y, adjacent two-stage splice joints are staggered, and B is required 1i ≠B 2i ；
A3, determining a vertical distance D from a punching center to the upper edge of the main stage of the upper iron yoke and a vertical distance H from the punching center to the central line of the window height, wherein the value range of D is 300mm-600mm, and the calculation formula of H is as follows:
H＝H 0 /2+B yoke 1 -D (13)；
A4, calculating the specific positions of the punched holes, and punching the punched holes on the splicing sheet on the outer side sheet of the side column, namely the width B, for the convenience of production personnel 1i And is punched on the central line of the stage with the smallest width of the outer side sheet of the side column, wherein the punching position is formed by using the vertical distance L from the punching center to the central line end point of the outer side sheet of the side column Splicing Offset distance w between center line of each side column outer side plate and width minimum center line Splicing Joint representation, L Splicing Including the distance L between the punching center and the center line end point in the stepping direction Spelling+ And the distance L between the punching center and the center line end point in the stepping-down direction Assembling 。
Specifically, the q-th stacking punching center and the stepping direction of the i-th left side column outer splicing sheet in A4Distance L to the median end point Spelling left side +i The calculation formula of (2) is as follows:
the distance L between the q-th stacking punching center of the i-th left side column outer splicing sheet and the neutral line end point in the stepping-down direction Spelling left side-i The calculation formula of (2) is as follows:
the distance L between the q-th stacking punching center of the i-th right side column outer splicing sheet and the neutral line end point in the stepping-down direction Spelling right side-i The calculation formula of (2) is as follows:
distance L between the (q) th stacking punching center of the (i) th right side column outer splicing piece and the neutral line end point in the stepping direction Spelling right side +i The calculation formula of (2) is as follows:
in formulas (14) to (17), i=1, 2, y, q=1, 2, n;
offset distance w between center line of ith side column outer side plate and width minimum center line Splicing The calculation formula of (2) is as follows:
w spelling i ＝B 1min /2-B 1i /2 (18)；
In formula (18), i=1, 2,..y, B 1min The width of the side column outer side sheet with the minimum width in all the stages to be spliced is the sheet-shaped width of the side column outer side sheet.
Further, L in the formulas (14) to (17) Splicing The calculation method is suitable for the clockwise stepping direction, and when the stepping direction is anticlockwise, the method is according to the stepping directionAnd correcting each formula by the stepping quantity.
Further, w Splicing When the calculation result of (a) is positive, punching the short side of the trapezoid by taking the median line of the trapezoid as a dividing line, and w Splicing And when the value is negative, punching is performed on the long side of the trapezoid sheet.
Further, the diameter of the punched holes may be 6mm, 8mm, 10mm, 16mm, 20mm, 24mm, etc.
The beneficial technical effects of the invention are as follows: the invention provides a method for calculating punching holes of iron core laminations of a transformer, which is characterized in that the punching holes of an upper iron yoke are canceled when a frame iron core is not overlapped with the upper iron yoke, one punching hole is added to one end of each of a core column sheet and a side column sheet, which is close to the upper iron yoke, and the situation that the side column sheets need to be spliced is fully considered.
After the punching hole is added, the manufacturing process of the transformer iron core is also changed, and the changed process is as follows: firstly, a U-shaped frame is formed by the side column sheet, the core column sheet and the lower iron yoke lamination, then the coil is sleeved in the U-shaped frame, and finally the upper iron yoke lamination is inserted in the position where the original upper iron yoke is located. The changed process omits the process of 'pulling iron', reduces the consumption of manpower and working hours, simultaneously avoids bending or damaging the silicon steel sheet in the process of 'pulling iron', and reduces the no-load loss of the iron core.
The changed process has the difficulty that the core column sheet, the side column sheet and the lower iron yoke of the frame iron core are not mutually restrained, the core column sheet and the side column sheet are difficult to position during overlapping, the problems that the core column sheet or the side column sheet is askew, the overlapping size is error and the like are possibly caused, and meanwhile, the problems of how to determine the punching position, how to calculate the specific position and how to accurately punch the holes are brought. Therefore, the novel punching calculation method provided by the invention can effectively prevent the deflection and dislocation of the core column sheet and the side column sheet, provides a theoretical basis for the accurate calculation of the punching position, and has a relatively high practical value.
The method fully considers the special condition of the iron core section design, and carries out corresponding correction on the formula, and the difference value of the side column and the core column sheet width is overlapped in the formulas (3) to (6), so that the dimensional influence caused by the final closing stage of the side column is eliminated, and the method has stronger universality and universality. The method is applied to actual production of a plurality of transformers, and good application effect is obtained.
Drawings
FIG. 1 is a schematic view showing a part of a core structure and a punched hole in example 1;
FIG. 2 is an A-A view of the center post and side post punching locations of example 1;
FIG. 3 is a schematic view of punching positions of the center pillar and the side pillar of example 1;
fig. 4 is a schematic diagram of punching positions of the side pillar sheet to be spliced in embodiment 2;
reference numerals illustrate: 1. a side column sheet; 2. a stem plate; 3. an upper yoke; 4. punching; 5. a lower yoke; 6. left side column piece; 7. left stem plate; 8. a right stem plate; 9. right side column sheet; 10. left side column sheets to be spliced; 11. left side column outside piece; 12. a right side column outer panel; 13. right side column sheet to be spliced.
Detailed Description
The invention will be further described with reference to the drawings and the specific examples.
Referring to fig. 1-4, a method for calculating punching holes of a lamination stack of a transformer core is to add a punching hole on the same horizontal height of a core column sheet and a side column sheet near one end of an upper yoke when the frame core is not overlapped with the upper yoke, cancel the punching hole of the upper yoke, calculate specific positions of the punching holes on the core column sheet and the side column sheet of each stage according to known data, and comprises a method for calculating the punching holes 4 of the core column sheet 2 and the side column sheet 1 when the frame core is not overlapped with the upper yoke 3 and a method for calculating the punching holes on splicing sheets when the side column sheets need to be spliced. The stem web 2 comprises a left stem web 7 and a right stem web 8, and the side web 1 comprises a left side web 6 and a right side web 9.
Example 1
The embodiment describes a punching method of a core column sheet and a side column sheet when a four-frame five-column iron core is taken as an example and the frame iron core is not overlapped with an iron yoke, and specifically comprises the following steps:
1. collecting known data required to calculate the punch position: iron core window height H 0 The step number n, the step amount p, the iron core stage number x and the sheet width B of each stage of the upper iron yoke and the lower iron yoke Yoke i I=1, 2,.. X, side column each stage tab width B Side i I=1, 2,.. X, stem each stage tab width B Heart i I=1, 2,..x, yoke internal step delta i I=1, 2,..x, side column inner step delta i I=1, 2,..x, side column outer level difference epsilon i I=1, 2,..x. In this embodiment, H 0 =2220 mm, n=6, p=7.2 mm, x=24. The remaining data are listed in table 1, with 3 stages being used as examples due to the higher number of stages.
Table 1 known data (unit mm)
2. The vertical distance D from the punching center to the upper edge of the upper yoke main stage and the punching number k are determined. In order to facilitate the production personnel to insert the locating pin into the punched hole, the value range of D is 300mm-600mm. The calculation formula of the punching quantity is as follows:
k＝2m+2 (1)，
where m is the number of stems.
In this example, the value of D is 400mm, which is verified by actual production of a plurality of products. A four-frame five-limb core has 3 limbs, so m=3, k=2×3+2=8.
3. The vertical distance H from the punching center to the window height center line is calculated by the following calculation formula:
H＝H 0 /2+B yoke 1 -D (2)，
In this embodiment of the present invention, in the present embodiment, h=2220++575-400=1285 (mm).
4. The specific position of each punched hole is calculated. For easy positioning, holes of each stage are punched on the central line of the final stage lamination, and the punching position is defined by the vertical distance L from the punching center to the central line end point of the trapezoid sheet and the deviation of the central line of each stage from the central line of the final stageThe displacement distance w is jointly represented. L comprises a distance L+ between the punching center and the end point of the median line in the stepping direction and a distance L-between the punching center and the end point of the median line in the stepping direction. w includes the offset distance w between each level center line and the final level center line of the core column Heart shape And offset distance w between each level center line and final level center line of side column Side by side 。
Specifically, the distance L between the q stacking punching center of the i-th left column sheet and the center line end point in the stepping direction Left heart +i The calculation formula of (2) is as follows:
distance L between the (q) th stacking punching center of the (i) th left column sheet and the neutral line end point in the stepping-down direction Left heart-i The calculation formula of (2) is as follows:
distance L between the (q) th stacking punching center of the (i) th right column sheet and the neutral line end point in the stepping-down direction Right heart-i The calculation formula of (2) is as follows:
distance L between the (q) th stacking punching center of the (i) th right column sheet and the neutral line end point in the stepping direction Right heart +i The calculation formula of (2) is as follows:
distance L between the center of the q-th stacking punching of the i-th left side column sheet and the neutral line end point in the stepping-down direction Left side-i The calculation formula of (2) is as follows:
distance L between the center of the q-th stacking punching of the i-th left side column sheet and the end point of the median line in the stepping direction Left side +i The calculation formula of (2) is as follows:
distance L between the center of the q-th stacking punching of the i-th right column sheet and the end point of the median line in the stepping direction Right side +i The calculation formula of (2) is as follows:
distance L between the center of the q-th stacking punching of the i-th right column sheet and the neutral line end point in the stepping-down direction Right side-i The calculation formula of (2) is as follows:
in formulas (3) to (10), i=1, 2, x, q=1, 2, n;
offset distance w between center line of ith stage core column sheet and center line of last stage Heart i The calculation formula of (2) is as follows:
w heart i ＝B Heart x /2-B Heart i /2 (11)，
Wherein B is Heart x Is the final-stage heart-post sheet-shaped width, B Heart i Is the width of the ith-level heart column sheet;
offset distance w between ith side column piece central line and last stage central line Side i The calculation formula of (2) is as follows:
in formulas (11) to (12), i=1, 2,..x.
In this embodiment, core leg piece and side leg piece punching data of the first to sixth stacks of 24-stage cores are calculated according to formulas (3) to (12), the calculation results of the first stack of the first 3 stages are listed in table 2, and the remaining stacks are calculated according to the first stack data in terms of the stepping amount and the stepping direction.
Table 2 1-3 level stem, side column first fold punching data (unit mm)
The calculation method of the formula (3) -the formula (10) about L is applicable to the anticlockwise stepping direction, and the embodiment is anticlockwise stepping, and when the stepping direction is clockwise, the formulas are only required to be corrected according to the stepping direction and the stepping amount.
And when the calculation result of w is positive, punching the short side of the trapezoid by taking the median line of the trapezoid as a dividing line, and when w is negative, punching the long side of the trapezoid. In this embodiment, w Heart i The calculated results of the (a) are negative values, and the punching holes of the front 3-stage core column sheet are all on the long side; w (w) Side i The calculation results of (a) are positive values, and the punching holes of the first 3-stage side column sheets are all on the short side.
Example 2
In this embodiment, a single-phase double-frame iron core is taken as an example to describe a punching calculation method on a splicing sheet when a side column sheet needs to be spliced, and in combination with fig. 4, the method specifically includes the following steps:
1. determining the number y of the side column sheets to be spliced and collecting known data required for calculating punching positions on the spliced sheets: iron core window height H 0 The step number n, the step amount p, the iron core stage number x and the sheet width B of each stage of the upper iron yoke and the lower iron yoke Yoke i I=1, 2,.. X, side column each stage tab width B Side i I=1, 2,..x, yoke internal step delta i I=1, 2,..x. In this embodiment, the side post pieces need to be spliced in 9 stages, so y=9. H 0 23 mm, n=6, p=7.2 mm, x=24. The remaining data are listed in the tableIn 3, only 9 stages of data are listed as examples due to the number of stages.
TABLE 3 known data (unit mm)
2. Determining the sheet-shaped width of the splicing sheet, and splicing two side column sheets, wherein the width of the side column outer side sheet is B 1i The width of the inner side piece of the side column is B 2i And has B 1i +B 2i ＝B Side i Where i=1, 2,..y. Adjacent two-stage splicing seams are staggered and need B 1i ≠B 2i . In this example, the front 9-stage side pillar panel was subjected to two-panel splicing, and the panel widths of the inner side panel and the outer side panel of the side pillar obtained according to actual production are shown in table 4.
TABLE 4 piece width of splicing pieces (unit mm)
3. And determining the vertical distance D from the punching center to the upper edge of the upper yoke main stage and the vertical distance H from the punching center to the window height center line, wherein the calculation method is the same as that when the side columns are not spliced. In this embodiment, D has a value of 550mm to avoid punching too close to the sharp corner of the trapezoidal piece. H is still calculated according to formula (2), so h=2395++570-550= 1217.5 (mm).
4. And calculating the specific position of each punched hole. For the convenience of production personnel, punching holes on the splicing sheet are punched on the outer side sheet of the side column, namely the width is B 1i And is punched on the center line of the stage with the smallest width of the side column outer side sheet. Vertical distance L from punching center to center line end point of side column outer side sheet for punching position Splicing Offset distance w between center line of each side column outer side plate and width minimum center line Splicing And (5) joint representation. L (L) Splicing Including the distance L between the punching center and the center line end point in the stepping direction Spelling+ And the distance L between the punching center and the center line end point in the stepping-down direction Assembling Two parts.
Specifically, the distance L between the center of the q-th stacking punching of the i-th left side column outer splicing sheet and the end point of the middle line in the stepping direction Spelling left side +i The calculation formula of (2) is as follows:
the distance L between the q-th stacking punching center of the i-th left side column outer splicing sheet and the neutral line end point in the stepping-down direction Spelling left side-i The calculation formula of (2) is as follows:
the distance L between the q-th stacking punching center of the i-th right side column outer splicing sheet and the neutral line end point in the stepping-down direction Spelling right side-i The calculation formula of (2) is as follows:
distance L between the (q) th stacking punching center of the (i) th right side column outer splicing piece and the neutral line end point in the stepping direction Spelling right side +i The calculation formula of (2) is as follows:
in formulas (13) to (16), i=1, 2, y, q=1, 2, n;
offset distance w between center line of ith side column outer side plate and width minimum center line Splicing The calculation formula of (2) is as follows:
w spelling i ＝B 1min /2-B 1i /2 (17)；
In formula (17), i=1, 2,..y, B 1min The width of the side column outer side sheet with the minimum width in all the stages to be spliced is the sheet-shaped width of the side column outer side sheet.
In this embodiment, B 1min The value of (2) is 170mAnd m, calculating punching data on side column sheets to be spliced of the front 9-stage iron core according to a formula (13) -a formula (17), and calculating the calculation result of the first stack of the front 9 stages in table 5, wherein the rest stacks are calculated according to the stepping amount and the stepping direction according to the first stack data.
Table 5 1-9 grade side column splice first fold punch data (in mm)
Grade number L Spelling left side +i L Spelling left side-i L Spelling right side-i L Spelling right side +i w Spelling i
1 322 2793 358 2757 -125
2 447 2918 483 2882 0
3 332 2803 368 2767 -115
4 447 2918 483 2882 0
5 332 2803 368 2767 -115
6 447 2918 483 2882 0
7 332 2803 368 2767 -115
8 432 2903 468 2867 -15
9 347 2818 383 2782 -100
In the formulae (13) - (16), L is defined as Splicing The calculation method of (2) is applicable to the clockwise stepping direction, the embodiment is also the clockwise stepping direction, and when the stepping direction is anticlockwise, all formulas are corrected according to the stepping direction and the stepping amount.
w Splicing When the calculation result of (a) is positive, punching the short side of the trapezoid by taking the median line of the trapezoid as a dividing line, and w Splicing And when the value is negative, punching is performed on the long side of the trapezoid sheet. In this embodiment, w Splicing And (2) the calculated result of (a) is a negative value and is a 0, and when the calculated result is a negative value, the punched hole is punched on the long side of the trapezoid sheet, and when the calculated result is a 0, the punched hole is just on the median line of the trapezoid sheet.
The foregoing is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, particularly the application scope of the present patent is not limited by the transformer core structure in the drawings. It should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of this patent, and such modifications and substitutions should also be considered to be within the scope of this patent.

Claims (9)

1. A method for calculating punching holes of a transformer core lamination is characterized in that when a frame core is not overlapped with an upper iron yoke, a punching hole is added to the same horizontal height of one end of a core column sheet and one end of a side column sheet, which are close to the upper iron yoke, respectively, and the punching holes of the upper iron yoke are canceled, and the specific positions of the punching holes on the core column sheet and the side column sheet of each stage are calculated by combining known data, and the punching hole calculation method comprises the following steps:
s1, collecting known data required by calculating punching positions; known data include: iron core window heightStep number n, step amount p, iron core stage number x, sheet width of each stage of upper and lower yokes ∈ ->Side column each stage slice width->Each level of slice-shaped width of the heart column>Difference in yoke->Differential level in side column->Difference of outer level of side column->；
S2, determining the vertical distance D from the punching center to the upper edge of the main stage of the upper yoke and the punching quantity k,
d has a value range of 300mm-600mm, and the calculation formula of the punching quantity k is as follows:
（1），
wherein m is the number of stems;
s3, calculating the vertical distance H from the punching center to the central line of the window height; the calculation formula of H in S3 is:
（2），
s4, calculating specific positions of each punched hole, punching holes of each stage on the central line of the final stage lamination for positioning conveniently, wherein the punched hole positions are represented by a combination of a vertical distance L from a punched center to a central line end point of a trapezoid sheet and an offset distance w between the central line of each stage and the central line of the final stage, L comprises a distance L+ between the punched center and the central line end point in the stepping direction and a distance L < - > between the punched center and the central line end point in the stepping direction, and w comprises an offset distance between the central line of each stage and the central line of the final stage of a mandrelAnd offset distance of center line of each stage of the side column from center line of final stage +.>；
Wherein S4 includes:
s41, when L+ is close to one end of the upper iron yoke, the calculation method is to subtract the distance H from the punching center to the window height center line from the lower edge of the main stage of the upper iron yoke, add half of the sheet width and the accumulated sum of the yoke inner level differences, and when L-is close to one end of the lower iron yoke, the calculation method is to add the sheet width and twice of the accumulated sum of the yoke inner level differences to the window height, add the height of a joint generated by a stepping structure, and subtract L+; when L+ is close to one end of the lower iron yoke, the corresponding L-is close to one end of the upper iron yoke, at this time, the L-is calculated firstly, the calculation method is that the distance from the lower edge of the main stage of the upper iron yoke to the central line of the window height is subtracted by the distance H from the punching center to the central line of the window height, the accumulated sum of half of the width of the upper sheet and the inner level difference of the yoke is added, the height of the joint generated by the stepping structure is added, the accumulated sum of the width of the window and the inner level difference of the yoke is added, the height of the joint generated by the stepping structure is added, and then L-is subtracted;
s42, eliminating the influence of the upper and lower yokes and the end of the side column in two stages, correcting the calculation method in S41, and superposing the difference value between the side column shape width and the core column shape width in L+ when L+ is close to one end of the upper yoke, and superposing twice the difference value between the side column shape width and the core column shape width in L-; when L+ is close to one end of the lower iron yoke, the difference value of the side column sheet-shaped width and the core column sheet-shaped width is overlapped in L-, and the difference value of the side column sheet-shaped width and the core column sheet-shaped width is overlapped in L+ by two times;
the core column sheet comprises a left core column sheet and a right core column sheet, the side column sheet comprises a left side column sheet and a right side column sheet, and the distance between the q-th stacking punching center of the i-th left core column sheet and the end point of the median line in the stepping direction in S4The calculation formula of (2) is as follows:
（3）；
distance between the center of the q-th stacking punching of the i-th left column sheet and the center line end point in the stepping-down directionThe calculation formula of (2) is as follows:
（4）；
distance between the center of the ith overlapped punching hole of the ith right column piece and the center line end point in the stepping-down directionThe calculation formula of (2) is as follows:
（5）；
distance between the center of the q-th stacking punching of the i-th right column sheet and the end point of the median line in the stepping directionThe calculation formula of (2) is as follows:
（6）；
distance between the center of the q-th stacking punching of the i-th left side column sheet and the neutral line end point in the stepping-down directionThe calculation formula of (2) is as follows:
（7）；
distance between the center of the q-th stacking punching of the i-th left side column sheet and the end point of the median line in the stepping directionThe calculation formula of (2) is as follows:
（8）；
distance between the center of the q-th stacking punching of the i-th right column sheet and the end point of the median line in the stepping directionThe calculation formula of (2) is as follows:
（9）；
distance between the center of the q-th stacking hole of the i-th right column sheet and the center line end point in the stepping-down directionThe calculation formula of (2) is as follows:
（10）；
in the formulas (3) to (10),，
s43, aligning the stem slices at one side of the frame-type oil duct,the calculation method of (1) is that one half of the width of each stage of heart column sheet shape is subtracted by one half of the width of the last stage heart column sheet shape; />The calculation method of (a) is to remove the current stage, then subtracting half of the accumulated sum of the yoke outer differences of each stage from half of the accumulated sum of the yoke inner differences of each stage.
2. The method for calculating a punch-out of a lamination of a transformer core according to claim 1, wherein the i-th stage core leg center line is offset from the final stage center line in S4The calculation formula of (2) is as follows:
（11），
wherein,is the final-stage heart-pole sheet-shaped width +.>Is the width of the ith-level heart column sheet;
offset distance between center line of ith side column piece and final stage center lineThe calculation formula of (2) is as follows:
（12）；
in the formulas (11) to (12),。
3. the method of calculating a punched hole of a transformer core lamination according to claim 1, wherein the calculation method of L in the formulas (3) to (10) is applied to a counterclockwise step direction, and when the step direction is clockwise, the formulas are corrected according to the step direction and the step amount.
4. The method of calculating a punched hole of a transformer core lamination according to claim 2, wherein the punched hole is punched on a short side of the trapezoidal piece with a median line of the trapezoidal piece as a boundary when the calculation result of w is positive, and on a long side of the trapezoidal piece when w is negative.
5. The method for calculating the punching of the lamination of the transformer core according to claim 1, wherein when the side post pieces are required to be spliced, the positioning holes are punched in the spliced side post pieces, and the method comprises the following steps:
a1, determining the stage y of the side column sheet to be spliced, and collecting known data required by calculating the punching position on the spliced sheet; the known data in A1 include: iron core window heightStep number n, step amount p, iron core stage number x, sheet width of each stage of upper and lower yokes ∈ ->Side column each stage slice width->Difference in yoke->；
A2, determining the sheet-shaped width of the splicing sheet; in A2, two pieces of side column sheets are spliced, and the width of the outer side sheet of the side column isThe width of the side column inner side piece is +.>And there is->Wherein->Adjacent two-stage splicing seams are staggered and are required to be provided with；
A3, determining a vertical distance D from a punching center to the upper edge of the main stage of the upper iron yoke and a vertical distance H from the punching center to the central line of the window height, wherein the value range of D is 300mm-600mm, and the calculation formula of H is as follows:
（13）；
a4, calculating the specific positions of all punched holes, punching the punched holes on the splicing sheet on the outer side sheet of the side column and on the central line of the stage with the minimum width of the outer side sheet of the side column for the convenience of production personnel, wherein the punched holes are formed by using the vertical distance from the punched hole center to the end point of the central line of the outer side sheet of the side columnOffset distance between center line of outer side plate of each side column and width minimum center lineCombined representation of->Comprising the distance between the punching center and the end point of the median line in the stepping direction +.>And distance between punching center and center line end point in stepping-down direction +.>；
Distance between the (q) th stacking punching center of the (i) th left side column outer splicing piece in A4 and the end point of middle line in the stepping directionThe calculation formula of (2) is as follows:
（14）；
the distance between the q-th stacking punching center of the i-th left side column outer splicing sheet and the neutral line end point in the stepping-down directionThe calculation formula of (2) is as follows:
（15）；
the distance between the q-th stacking punching center of the i-th right side column outer splicing sheet and the neutral line end point in the stepping-down directionThe calculation formula of (2) is as follows:
（16）；
distance between the (q) th stacking punching center of the (i) th right side column outer splicing piece and the neutral line end point in the stepping directionThe calculation formula of (2) is as follows:
（17）；
in the formulas (14) to (17),。
6. the method of calculating a punch out for a transformer core lamination of claim 5, wherein the i-th side leg outer leg centerline is offset from the width minimum centerlineThe calculation formula of (2) is as follows:
（18）；
in the formula (18) of the present invention,，/>the width of the side column outer side sheet with the minimum width in all the stages to be spliced is the sheet-shaped width of the side column outer side sheet.
7. The method of calculating a punch of a transformer core lamination according to claim 5, wherein the formulas (14) to (17) areThe calculation method is suitable for the clockwise stepping direction, and when the stepping direction is anticlockwise, each formula is corrected according to the stepping direction and the stepping amount.
8. The transformer core lamination punch of claim 6The method for calculating the hole is characterized in that,when the calculation result of (2) is positive, punching the short side of the trapezoid by taking the median line of the trapezoid as a dividing line, and +.>And when the value is negative, punching is performed on the long side of the trapezoid sheet.
9. The method of calculating a punched hole of a transformer core lamination of claim 1, wherein the punched hole has a diameter of one of 6mm, 8mm, 10mm, 16mm, 20mm, 24 mm.
CN202210479485.1A 2022-04-29 2022-04-29 Transformer core lamination punching calculation method Active CN114783758B (en)

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