CN111654167A - Motor stator core and assembling method thereof - Google Patents
Motor stator core and assembling method thereof Download PDFInfo
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- CN111654167A CN111654167A CN202010175391.6A CN202010175391A CN111654167A CN 111654167 A CN111654167 A CN 111654167A CN 202010175391 A CN202010175391 A CN 202010175391A CN 111654167 A CN111654167 A CN 111654167A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
- H02K15/024—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies with slots
- H02K15/026—Wound cores
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
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Abstract
The invention relates to a motor stator core and an assembly method thereof, wherein the assembly method comprises the following steps: pre-overlapping and measuring the inner diameter and the outer diameter of a real iron core; and the inner diameter of the middle section of the iron core is ensured by using a jacking tool. The assembling method can successfully assemble the stator core which is composed of the fan-shaped sheets and has no tension screw, and the tolerance of the inner diameter of the core is greatly reduced, so that the assembling method can be suitable for the most advanced test product ocean tidal current energy generator in the field of new energy.
Description
Technical Field
The invention relates to an assembly method, in particular to an assembly method of a motor stator core, and further relates to a stator core obtained by the assembly method, belonging to the field of generators.
Background
The stator core is an important component of the motor, is a main component of a magnetic circuit, is a basic component for electric and magnetic conversion, and is used for fixing a stator coil winding. When the motor works, the stator core is subjected to the comprehensive action of mechanical force, electromagnetic force and thermal stress. The stator iron core is formed by laminating electrical silicon steel sheets and is fixed on the stator base. For a stator core with the outer diameter larger than 900mm, unit parts of the stator core are generally formed by fan-shaped punching sheets instead of full-circle punching sheets, the outer circle diameter of the stator core punching sheet is smaller than 3300mm, and the stator core punching sheet is generally positioned with the outer circle of the punching sheet and compressed by a tensioning screw after being turned by a rib plate welded on a machine base, as shown in fig. 8; for larger diameter, the positioning rib and the outer circle of the punching sheet are positioned by a single pigeon tail or double pigeon tails and are compressed by a tensioning screw, as shown in fig. 9.
The stator core with the above structure has been a standard structural formula in the industry for many years, but can be improved in two aspects: firstly, the structure can be simplified, for example, a tensioning screw rod is omitted, so that a support block or a fixing piece for fixing the tensioning screw rod and tensioning screw rod holes at two ends of a machine base are omitted, the material consumption can be reduced, and the manufacturing process cost can be reduced; secondly, the stator core with the above structure, taking a hydro-generator as an example, has larger tolerance of the inner diameter due to self dimension errors of parts such as a base, a punching sheet and a positioning piece and the accumulation of assembly errors influenced by the stacking process, and the diameter of the stator core is larger than 2 meters and generally exceeds +/-0.5 mm. Because the processing mode of the punching sheet is mainly retest punching, the punching sheet is also subjected to wire cutting and laser cutting at present, and the tolerance and the burr size of the processed punching sheet are different; the rib positioned with the outer circle of the punching sheet on the base is processed according to a preset size, the rib is not matched with the diameter of the outer circle of the punching sheet in fact, the height of the inner circle of the iron core is slightly larger than the outer circle due to the fact that the perimeter of the tooth part of the punching sheet is far larger than the outer circle when the iron core is pressed, the pressing force has horizontal inward component force on the iron core, the outer circle of the iron core tends to leave the positioning rib of the base, and therefore the problem that the inner diameter of the middle section of the iron core. The tolerance of the inner diameter of the conventional core is large. If the laminating tool and the assembling method are innovated, the tolerance of the laminating tool can be reduced, the air gaps between the stator and the rotor are more uniform, and the performance of the motor is more stable and improved.
Disclosure of Invention
The stator core is composed of fan-shaped sheets and is provided with a tension screw rod, the tolerance of the inner diameter of the stator core is greatly reduced, and the stator core can be used for an ocean tide energy generator which is the most advanced test product in the field of new energy.
The technical scheme of the invention is as follows:
a motor stator core assembly method is characterized in that: the method comprises the following steps:
step (1), pre-overlapping measurement of the inner and outer diameters of a real iron core
For a stator iron core, positioning the diameter of the stator iron core by an outer circle, positioning the circumferential groove shape of the stator iron core by a bolt, stacking a section of the iron core, keeping the pressing force consistent with that of a final product, measuring the inner diameter after pressing, and recording the difference between the measured inner diameter and the designed size; then the diameter is positioned by an inner circle, the circumference is positioned by a bolt, the size of the outer circle of the iron core is measured after the iron core is compressed, and the difference between the measured size and the designed size of the inner circle of the rib positioning surface of the machine base is recorded;
step (2) processing the machine seat rib positioning surface based on the record of the step (1), namely determining the actual processing size of the machine seat rib positioning surface
Step (3) using a jacking tool to ensure the inner diameter of the middle section of the iron core
After the machine base is machined, when a product is actually laminated, the jacking tool is placed inside the iron core and evenly jacks outwards in the circumferential direction, so that the inner diameter of the middle section of the iron core is prevented from being reduced due to the fact that the stator punching sheet leaves the positioning rib of the machine base; measuring the size of the inner diameter of the iron core after the iron core is compressed, and welding the pressing ring and the machine base into a whole according with the requirement; and (5) removing the jacking device after the welding is finished and cooled.
In the step (1), a stator core pre-stack measuring disc is used for measuring the inner diameter and the outer diameter of a real iron core, the stator core pre-stack measuring disc comprises a disc body, positioning rabbets are respectively designed on the front surface and the back surface of the disc body according to the nominal sizes of the inner circle and the outer circle of the iron core, long round holes are formed in the middle of the disc body corresponding to the positions of each punching sheet groove, and a plug pin penetrates through the long round holes for positioning; one side of the iron core is provided with a pressing ring and a pressing plate, the disk body is arranged on the other side of the iron core, and the pressing ring, the pressing plate, the iron core and the disk body are connected through a pressing bolt; two long round holes slightly larger than the slots are arranged in the middle of the disc body corresponding to each punching sheet slot; a plurality of screw holes and through holes are formed near the outer side of the tray body along the periphery of the tray body, the screw holes and the through holes are alternately distributed, and the distance from each through hole to the circle center is smaller than the distance from each screw hole to the circle center; a small step with a slightly smaller outer diameter is arranged on the front surface of the tray body close to the outer circle of the iron core, the screw hole is positioned on the outer side of the small step, and the through hole is arranged on the inner side of the small step; a circular bulge is arranged in the middle of the front face of the tray body, the diameter of the circular bulge is the same as the inner diameter of the iron core, a plurality of holes are formed around the circular bulge, and the long round holes are formed along the periphery of the circular bulge; a circular groove is arranged in the middle of the back of the tray body, and the diameter of the circular groove is the same as the outer diameter of the iron core; the back of the measuring disc near the inner circle of the iron core is provided with a small step slightly larger than the inner diameter.
In the step (1), the process of measuring the actual outer diameter of the iron core is as follows: sequentially stacking punching sheets on the front face of a pre-stacking measuring disc, radially positioning by enabling the inner circle of each punching sheet to be close to a protruding face, positioning by inserting a bolt in a groove shape in the circumferential direction, and setting a long round hole slightly larger than the groove shape of each punching sheet so as not to interfere when the bolt is inserted, stacking a section of iron core with the height of about 20mm, installing a pressing ring and a pressing plate to press the iron core, wherein the pressing force is consistent with that of a final product, and measuring by using an outside micrometer after pressing to obtain the actual outside diameter of the iron core; after the outer diameter is measured, the bolt, the pressing plate, the pressing ring and the punching sheet are detached, and the inner diameter is prepared to be measured;
measuring the actual inner diameter of the iron core: and (3) turning over the measuring disc, sequentially stacking the punching sheets on the reverse side of the measuring disc, radially positioning by leaning against the circular groove surface by the excircle of the punching sheet, keeping the rest consistent with the process of measuring the outer diameter, and measuring the inner diameter of the iron core by using an inside micrometer after the iron core is compressed. Similarly, a small step slightly larger than the inner diameter is arranged on the back surface of the measuring disc close to the inner circle of the iron core, and the punched sheet is convenient to take out after the purpose of measurement.
In the step (2), the jacking tool comprises a middle support frame and a plurality of jacking heads arranged around the middle support frame, the jacking heads are jacked on the punching sheet and comprise jacking screw rods, one end of each supporting pipe is movably arranged on each jacking screw rod and is adjusted by a wrench on each supporting pipe, and the other end of each supporting pipe is provided with a positioning bolt which is matched with the punching sheet groove in shape; the other end of the supporting pipe is provided with a support, the support is provided with a thrust bearing, one end of the thrust bearing is connected with the fork head, and the positioning bolt is clamped on the fork head to tightly push the punching sheet; the connecting part of the thrust bearing and the fork head is also provided with a dustproof anti-drop cover; the middle support frame is in a multi-deformation shape, a ring shape, a round shape or other shapes which can be placed in the iron core for supporting.
In the step (2), when the supporting device is used, the jacking screw rod is connected and fixed with the middle supporting frame, the fork head is clamped on the groove-shaped positioning plug pin, the positioning plug pin extends out of the inner circle of the stator core by 10-20 mm, the twisting handle is rotated, the supporting tube can stretch, and when the positioning plug pin extends out, the punching sheet is jacked by the positioning plug pin, so that the outer circle of the punching sheet is abutted against a positioning rib of the base, and the purpose of reliably positioning and reducing the tolerance of the inner circle of; when retracting, the device can be disassembled.
In the step (2), the specific process is as follows:
recording the designed diameter dimension of the rib positioning surface of the engine base as A, and recording the actually measured difference value in the step (1) as a, b, c, d, e and f according to the actual condition; the actual machining size of the positioning surface of the machine seat rib is calculated according to the following conditions:
when the inner diameter of the actually measured iron core is a larger than the design size and the outer diameter of the actually measured iron core is b larger than the design size, the actual machining size of the positioning surface of the stand rib is A-a + b;
when the inner diameter of the actually measured iron core is a larger than the design size and the outer diameter is c smaller than the design size, the actual machining size of the positioning surface of the stand rib is A-a-c;
when the inner diameter of the actually measured iron core is smaller than the design size by d and the outer diameter is larger than the design size by e, the actual machining size of the positioning surface of the stand rib is A + d + e;
and when the actually measured inner diameter of the iron core is smaller than the design size by d and the outer diameter is smaller than the design size by f, the actual machining size of the positioning surface of the stand rib is A + d-f.
The assembled stator core comprises a machine base, a pressing ring is arranged on the machine base, the machine base is formed by welding an upper ring, a lower ring and a vertical rib plate, and the inner circle of the vertical rib plate is matched and processed into a positioning surface after welding to be positioned with the outer circle of a punching sheet; a step is processed on the lower ring, the lower end tooth pressing strip is arranged on the step, and the punching sheets are stacked upwards from the lower end tooth pressing strip; the upper end tooth pressure strip is welded on the pressure ring, and finally the pressure ring and the upper ring of the machine base are integrated.
Compared with the prior art, the invention has the following beneficial effects:
1. the iron core pre-stacking measuring disc is simple to manufacture and measure, the cost of the iron core pre-stacking measuring disc is not high, and the tool has certain universality and reusability; the iron core pre-stacking measuring disc is ingenious in structure, the requirement for pre-stacking measurement of the inner diameter and the outer diameter of a real iron core is met through the use of the two surfaces of the part, and the iron core pre-stacking measuring disc is particularly suitable for high-quality motors with strict requirements on air gaps.
2. The invention adopts the process method of matching and processing the positioning surface of the machine seat rib, thereby improving the dimensional accuracy of the iron core. Compared with the traditional stator core with the tension screw rod, the stator core obtained by assembly has a very simplified structure.
3. The invention enables the supporting tube to be telescopic by rotating the twisting handle of the jacking tool, and the punching sheet is tightly jacked by the bolt when the supporting tube extends out, so that the outer circle of the punching sheet is abutted against the positioning rib of the machine base, thereby achieving the purpose of reliably positioning and reducing the tolerance of the inner circle of the stator core.
4. The assembling method can successfully assemble the stator core which is composed of the fan-shaped sheets and has no tension screw, and the tolerance of the inner diameter of the core is greatly reduced, so that the assembling method can be suitable for the most advanced test product ocean tidal current energy generator in the field of new energy.
Drawings
Fig. 1 is a schematic structural view of the front side of a pre-stacked measuring disk of a core according to the present invention;
FIG. 2 is a sectional view A-A of FIG. 1;
FIG. 3 is a schematic structural diagram of the core pre-stack measuring disk of the present invention for measurement;
FIG. 4 is a schematic structural diagram of the supporting device of the present invention supported on the sheet;
FIG. 5 is a front view of the jacking device of the present invention;
FIG. 6 is a schematic view of the structure of the supporting device of the present invention;
FIG. 7 is a schematic structural view of a stator core without tie-rods and laminations thereof in accordance with the present invention;
FIG. 8 is a schematic structural diagram of a stator core and its laminations positioned by conventional frame ribs;
fig. 9 is a schematic structural diagram of a stator core and its laminations of a conventional dove-tail rib structure.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of examples of the present invention, and not all examples. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1, the stator core pre-stack measuring disc 1 of the present embodiment includes a disc body 1.1, and two oblong holes 1.5 slightly larger than the slots are provided in the middle of the disc body 1.1 corresponding to each punching sheet slot. Near the outer side of the tray body 1.1, a plurality of screw holes 1.2 and through holes 1.3 are arranged along the periphery of the tray body, the screw holes 1.2 and the through holes 1.3 are alternately distributed, and the distance from each through hole 1.3 to the circle center is smaller than the distance from each screw hole 1.2 to the circle center. The front surface of the disk body 1.1 is provided with a small step 1.4 which is slightly smaller than the outer diameter close to the outer circle of the iron core, the screw hole 1.2 is positioned at the outer side of the small step 1.4, and the through hole 1.3 is positioned at the inner side of the small step 1.4, as shown in figure 2.
The middle of the front face of the tray body 1.1 is provided with a circular bulge 1.6, the diameter of the circular bulge 1.6 is the same as the inner diameter of the iron core, a plurality of holes 1.7 are arranged around the circular bulge 1.6, and the long round holes 1.5 are arranged along the periphery of the circular bulge 1.7. The middle part of the back of the tray body is provided with a circular groove 1.9, and the diameter of the circular groove 1.9 is the same as the outer diameter of the iron core. The back of the measuring disc near the inner circle of the iron core is provided with a small step 1.8 which is slightly larger than the inner diameter.
The front surface and the back surface (AB surface) of the tray body are respectively provided with a positioning spigot according to the nominal sizes of the inner circle and the outer circle of the iron core, and the bolt passes through the long round hole for 1.5 positioning.
As shown in fig. 3, the iron core pre-stack measuring disc 1 further includes a pressing ring 2 and a pressing plate 3 disposed on one side of the iron core 5, the disc body 1.1 is disposed on the other side of the iron core 5, and the pressing ring 2, the pressing plate 3, the iron core 5 and the disc body 1.1 are connected by a pressing bolt 4.
The pre-stack measuring disc can be directly processed by a steel plate, positioning rabbets are designed on the front surface and the back surface of the part according to nominal sizes D and D of an inner circle and an outer circle of a iron core respectively, two long round holes slightly larger than the slots are formed in the middle of the part corresponding to each punching sheet slot, and therefore a plug pin can penetrate through the slots to be positioned. The long round holes on the measuring disc and the pressure ring are used for penetrating through the rectangular positioning pins to realize plug positioning without interference.
As shown in figure 3, when in use, the diameter is firstly positioned by an outer circle, the groove shape in the circumferential direction is neat and positioned by bolts, a section of iron core is stacked, the pressing force is consistent with that of a final product, after the iron core is pressed, an inner diameter is measured by an inner diameter micrometer, and the difference between the measured inner diameter and the designed dimension is recorded. And then, the turn-over of the measuring disc is measured, the diameter is positioned by an inner circle, the circumference is positioned by a bolt, the size of the outer circle of the iron core is measured by an outer micrometer after the iron core is compressed, the difference between the designed size of the inner circle of the rib positioning surface of the machine base and the designed size of the inner circle of the rib positioning surface of the machine base is recorded, and the actual machining size of the rib positioning surface of the machine base is. The method for processing the positioning surface of the machine seat ensures the inner diameter size of the iron core.
Measuring the actual outer diameter of the iron core: the punching sheets are sequentially stacked on the surface A of the pre-stacked measuring disc, the inner circle of each punching sheet is positioned close to the surface d in the radial direction, the grooves in the circumferential direction are orderly positioned by inserting bolts, long round holes slightly larger than the grooves of the punching sheets are arranged, so that the bolts do not interfere with each other when inserted, the iron core is stacked by about 20mm in height, a pressing ring and a pressing plate are arranged to press the iron core, the pressing force is consistent with that of a final product, and the actual outer diameter of the iron core can be obtained by measuring with an outside micrometer after pressing. A small step slightly smaller than the outer diameter is arranged on the surface A of the measuring disc close to the outer circle of the iron core, and the punched sheet is convenient to take out after the purpose of measurement.
When measuring the outer diameter, other parts are arranged on the back surface, and the measuring disc is turned over for use, such as the position of the double-dot chain line in fig. 4.
Measuring the actual inner diameter of the iron core: and (3) turning over the measuring disc, sequentially stacking the punching sheets on the surface B of the measuring disc, radially positioning by tightly leaning against the surface D with the outer circle of the punching sheet, keeping the rest consistent with the process of measuring the outer diameter, and measuring the inner diameter of the iron core by using an inner micrometer after the iron core is compressed. Similarly, a small step slightly larger than the inner diameter is arranged on the surface B of the measuring disc close to the inner circle of the iron core, and the punched sheet is convenient to take out after the purpose of measurement.
The inner and outer diameter sizes of the actual iron core laminated by the punching sheets processed by different batches and different devices can be measured by the simple method.
As shown in fig. 4, the stator core supporting tool of the present embodiment includes a middle supporting frame 6 and a plurality of supporting heads 7 disposed around the middle supporting frame 6, and the plurality of supporting heads 7 are supported on a punching sheet 8.
As shown in fig. 5, the supporting head 7 includes a supporting screw 7.7, the supporting screw 7.7 is screwed and tightened on the middle support 6, or hinged on the middle support 6, one end of the supporting tube 7.6 is screwed on the supporting screw 7.7, and is adjusted by a wrench 7.5 on the supporting tube 7.6, the wrench 2.5 is inserted into the supporting tube 2.6, and the supporting tube 2.6 is driven to extend and retract on the supporting screw 2.7. The hinge is rotated, namely the supporting tube is rotated, the supporting tube can stretch out and draw back on the jacking screw rod, the supporting tube is in threaded connection with the jacking screw rod and is equivalent to a nut, the jacking screw rod does not rotate, the nut can move, retracts in the forward rotation process, stretches out and tightly supports in the reverse rotation process, and the supporting tube can stretch out and draw back. The other end of the supporting tube 7.6 is provided with a support 7.4, the support 7.4 is provided with a thrust bearing 7.3, one end of the thrust bearing 7.3 is connected with the fork head 7.1, and a positioning bolt 7.8 is clamped on the fork head 7.1. The positioning bolt 7.8 is matched with the punching sheet 8 in groove shape. The connecting part of the thrust bearing 7.3 and the fork head 7.1 is also provided with a dustproof anti-drop cover 7.2. The middle support frame 1 of the embodiment is polygonal, and each side is provided with a supporting head 7. The intermediate support 1 may be polygonal, circular or other shapes that can be placed inside the core for support.
After the machine base is processed, when a product is actually laminated, the jacking device of the embodiment is used for preventing the iron core from leaving the machine base positioning rib to cause the inner diameter of the middle section of the iron core to be reduced. The size of the inner diameter of the iron core is measured after the pressing, and the pressing ring and the machine base can be welded into a whole according with the requirement. And after the welding is finished and the cooling is finished, the jacking device is detached.
The length of the supporting head 7 can be adjusted in a telescopic manner, and the supporting head can cover most of the inner diameter of the stator core. When the device is used, the jacking screw 7.7 is connected and fixed with the middle support frame 6, the fork 7.1 is clamped on the groove-shaped positioning bolt 7.8, the positioning bolt 7.8 extends out of the inner circle of the stator core by 10-20 mm, the rotary twisting process is 7.5, the support tube 7.6 can stretch, and when the positioning bolt 7.8 extends out, the punching sheet 8 is jacked tightly, so that the outer circle of the punching sheet 8 abuts against a positioning rib of a machine base, and the purpose of reliably positioning and reducing the tolerance of the inner circle of the stator core is achieved; when retracting, the device can be disassembled. This embodiment has set up thrust bearing 7.3 between fork 7.1 and stay tube 7.6, when rotating hank's hand 7.5, only transmits the power of outside top to fork 7.1, and fork 7.1 can not follow the rotation, and fork 2.1 is connected with thrust bearing moving coil excircle with the tang, as shown in fig. 6.
As shown in fig. 6 and 7, the stator core assembled by the assembly method of the present embodiment is composed of a welding machine base 9, an upper end tooth pressing strip 11, a lower end tooth pressing strip 12, a pressing ring 10, and a stator punching sheet 8.
The welding machine base 9 is formed by welding an upper ring 9.1, a lower ring 9.3 and a vertical rib plate 9.2, and the inner circle of the vertical rib plate 9.2 is matched and processed into a positioning surface 14 to be positioned with the outer circle of the punching sheet 8 after welding; a step 13 is processed on the lower ring 9.3, a lower end tooth pressing strip 12 is welded on the step 13, and the punching sheets 8 are stacked upwards from the lower end tooth pressing strip 13; the upper end tooth pressing strip 11 is welded on the pressing ring 10, and finally (after the inner diameter of the iron core is qualified), the pressing ring 10 and the upper ring 9.1 of the machine base are welded into a whole, as shown in fig. 7. Compared with the traditional stator core with the tension screw rod, the stator core has the advantages that the structure is very simplified, and the precision can meet the requirement.
The assembly process of the invention is as follows:
step (1), pre-overlapping measurement of the inner and outer diameters of a real iron core
And stacking actual stator sector punching sheets on the front surface and the back surface of the pre-stacking measuring disc respectively. The diameter is firstly positioned by an outer circle, the groove shape in the circumferential direction is neat, the positioning is carried out by bolts, a section of iron core is stacked, the pressing force is consistent with that of a final product, the inner diameter is measured after the pressing, and the difference between the inner diameter and the designed size is recorded; then the diameter is positioned by an inner circle, the circumference is positioned by a bolt, the size of the outer circle of the iron core is measured after the iron core is compressed, and the difference between the measured size and the designed size of the inner circle of the rib positioning surface of the machine base is recorded.
Step (2), determining the actual machining size of the machine seat rib positioning surface, and machining the machine seat rib positioning surface
The nominal diameter (design size) of the positioning surface of the frame rib is marked as A, and the actually measured difference is recorded on the nominal diameter (design size)
The values are recorded as a, b, c, d, e, f, as the case may be. The actual processing size of the positioning surface of the machine seat rib is calculated according to a matched one of the following conditions.
Firstly, actually measuring the actual processing size of a positioning surface of a machine seat rib as A-a + b when the inner diameter of the iron core is a larger than the design size and the outer diameter is b larger than the design size;
Step (3) stacking actual product punching sheets
After the machine base is machined, the punching sheets are stacked upwards from time to time on the tooth pressing strips at the lower end of the step surface of the lower ring of the machine base, and after the punching sheets are stacked to the product height, the pressing ring is placed at the upper end of the punching sheets and is not welded with the upper ring of the machine base.
Step (4), installing a jacking device and measuring the inner diameter of the product iron core
The jacking tool is hoisted at the middle section in the stator core, the stator core is uniformly pushed outwards in the circumferential direction, and the stator punching sheet is prevented from leaving the machine base rib positioning surface to cause the inner diameter of the middle section of the core to be reduced. After the core was axially compressed, the inside diameter of the actual product core was measured with an inside micrometer, as shown in fig. 6.
Step (5), welding, dismantling tool and finishing
After the inner diameter of the iron core is measured to meet the requirement, the pressing ring and the machine base can be welded into a whole; after the welding is finished and cooled, the jacking device can be detached. And rotating the twisting handle, retracting the jacking head, hanging the jacking device out, and taking out the positioning bolt to obtain the stator core with better dimensional accuracy.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A motor stator core assembly method is characterized in that: the method comprises the following steps:
step (1), pre-overlapping measurement of the inner and outer diameters of a real iron core
For a stator iron core, positioning the diameter of the stator iron core by an outer circle, positioning the circumferential groove shape of the stator iron core by a bolt, stacking a section of the iron core, keeping the pressing force consistent with that of a final product, measuring the inner diameter after pressing, and recording the difference between the measured inner diameter and the designed size; then the diameter is positioned by an inner circle, the circumference is positioned by a bolt, the size of the outer circle of the iron core is measured after the iron core is compressed, and the difference between the measured size and the designed size of the inner circle of the rib positioning surface of the machine base is recorded;
step (2) processing the machine seat rib positioning surface based on the record of the step (1), namely determining the actual processing size of the machine seat rib positioning surface
Step (3) using a jacking tool to ensure the inner diameter of the middle section of the iron core
After the machine base is machined, when a product is actually laminated, the jacking tool is placed inside the iron core and evenly jacks outwards in the circumferential direction, so that the inner diameter of the middle section of the iron core is prevented from being reduced due to the fact that the stator punching sheet leaves the positioning rib of the machine base; measuring the size of the inner diameter of the iron core after the iron core is compressed, and welding the pressing ring and the machine base into a whole according with the requirement; and (5) removing the jacking device after the welding is finished and cooled.
2. A method of assembling a stator core for an electrical machine according to claim 1, characterized by: in the step (1), a stator core pre-stack measuring disc is used for measuring the inner diameter and the outer diameter of a real iron core, the stator core pre-stack measuring disc comprises a disc body, positioning rabbets are respectively designed on the front surface and the back surface of the disc body according to the nominal sizes of the inner circle and the outer circle of the iron core, long round holes are formed in the middle of the disc body corresponding to the positions of each punching sheet groove, and a plug pin penetrates through the long round holes for positioning; one side of the iron core is provided with a pressing ring and a pressing plate, the disk body is arranged on the other side of the iron core, and the pressing ring, the pressing plate, the iron core and the disk body are connected through a pressing bolt; two long round holes slightly larger than the slots are arranged in the middle of the disc body corresponding to each punching sheet slot; a plurality of screw holes and through holes are formed near the outer side of the tray body along the periphery of the tray body, the screw holes and the through holes are alternately distributed, and the distance from each through hole to the circle center is smaller than the distance from each screw hole to the circle center; a small step with a slightly smaller outer diameter is arranged on the front surface of the tray body close to the outer circle of the iron core, the screw hole is positioned on the outer side of the small step, and the through hole is arranged on the inner side of the small step; a circular bulge is arranged in the middle of the front face of the tray body, the diameter of the circular bulge is the same as the inner diameter of the iron core, a plurality of holes are formed around the circular bulge, and the long round holes are formed along the periphery of the circular bulge; a circular groove is arranged in the middle of the back of the tray body, and the diameter of the circular groove is the same as the outer diameter of the iron core; the back of the measuring disc near the inner circle of the iron core is provided with a small step slightly larger than the inner diameter.
3. A method of assembling a stator core for an electrical machine according to claim 2, characterized by: in the step (1), the process of measuring the actual outer diameter of the iron core is as follows: sequentially stacking punching sheets on the front face of a pre-stacking measuring disc, radially positioning by enabling the inner circle of each punching sheet to be close to a protruding face, positioning by inserting a bolt in a groove shape in the circumferential direction, and setting a long round hole slightly larger than the groove shape of each punching sheet so as not to interfere when the bolt is inserted, stacking a section of iron core with the height of about 20mm, installing a pressing ring and a pressing plate to press the iron core, wherein the pressing force is consistent with that of a final product, and measuring by using an outside micrometer after pressing to obtain the actual outside diameter of the iron core; after the outer diameter is measured, the bolt, the pressing plate, the pressing ring and the punching sheet are detached, and the inner diameter is prepared to be measured;
measuring the actual inner diameter of the iron core: and (3) turning over the measuring disc, sequentially stacking the punching sheets on the reverse side of the measuring disc, radially positioning by leaning against the circular groove surface by the excircle of the punching sheet, keeping the rest consistent with the process of measuring the outer diameter, and measuring the inner diameter of the iron core by using an inside micrometer after the iron core is compressed. Similarly, a small step slightly larger than the inner diameter is arranged on the back surface of the measuring disc close to the inner circle of the iron core, and the punched sheet is convenient to take out after the purpose of measurement.
4. A method of assembling a stator core for an electrical machine according to claim 1, characterized by: in the step (2), the jacking tool comprises a middle support frame and a plurality of jacking heads arranged around the middle support frame, the jacking heads are jacked on the punching sheet and comprise jacking screw rods, one end of each supporting pipe is movably arranged on each jacking screw rod and is adjusted by a wrench on each supporting pipe, and the other end of each supporting pipe is provided with a positioning bolt which is matched with the punching sheet groove in shape; the other end of the supporting pipe is provided with a support, the support is provided with a thrust bearing, one end of the thrust bearing is connected with the fork head, and the positioning bolt is clamped on the fork head to tightly push the punching sheet; the connecting part of the thrust bearing and the fork head is also provided with a dustproof anti-drop cover; the middle support frame is in a multi-deformation shape, a ring shape, a round shape or other shapes which can be placed in the iron core for supporting.
5. A method of assembling a stator core for an electrical machine according to claim 4, characterized by: in the step (2), when the supporting device is used, the jacking screw rod is connected and fixed with the middle supporting frame, the fork head is clamped on the groove-shaped positioning plug pin, the positioning plug pin extends out of the inner circle of the stator core by 10-20 mm, the twisting handle is rotated, the supporting tube can stretch, and when the positioning plug pin extends out, the punching sheet is jacked by the positioning plug pin, so that the outer circle of the punching sheet is abutted against a positioning rib of the base, and the purpose of reliably positioning and reducing the tolerance of the inner circle of; when retracting, the device can be disassembled.
6. A method of assembling a stator core for an electrical machine according to claim 4, characterized by: in the step (2), the specific process is as follows:
recording the designed diameter dimension of the rib positioning surface of the engine base as A, and recording the actually measured difference value in the step (1) as a, b, c, d, e and f according to the actual condition; the actual machining size of the positioning surface of the machine seat rib is calculated according to the following conditions:
when the inner diameter of the actually measured iron core is a larger than the design size and the outer diameter of the actually measured iron core is b larger than the design size, the actual machining size of the positioning surface of the stand rib is A-a + b;
when the inner diameter of the actually measured iron core is a larger than the design size and the outer diameter is c smaller than the design size, the actual machining size of the positioning surface of the stand rib is A-a-c;
when the inner diameter of the actually measured iron core is smaller than the design size by d and the outer diameter is larger than the design size by e, the actual machining size of the positioning surface of the stand rib is A + d + e;
and when the actually measured inner diameter of the iron core is smaller than the design size by d and the outer diameter is smaller than the design size by f, the actual machining size of the positioning surface of the stand rib is A + d-f.
7. A stator core assembled by the method of any one of claims 1-6, wherein: the pressing ring is arranged on the machine base, the machine base is formed by welding an upper ring, a lower ring and a vertical rib plate, and the inner circle of the vertical rib plate is matched and processed into a positioning surface after welding to be positioned with the outer circle of the punching sheet; a step is processed on the lower ring, the lower end tooth pressing strip is arranged on the step, and the punching sheets are stacked upwards from the lower end tooth pressing strip; the upper end tooth pressure strip is welded on the pressure ring, and finally the pressure ring and the upper ring of the machine base are integrated.
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| CN112564432A (en) * | 2020-12-27 | 2021-03-26 | 陕西航空电气有限责任公司 | Positioning fixture for brush box correction of brush direct current motor |
| CN113364226A (en) * | 2021-07-22 | 2021-09-07 | 哈尔滨电机厂有限责任公司 | Horizontal type stacking positioning and compressing process method for main stator iron core |
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| CN111654167B (en) | 2022-05-31 |
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