CN116551095A - Motor rotor conducting ring brazing method - Google Patents
Motor rotor conducting ring brazing method Download PDFInfo
- Publication number
- CN116551095A CN116551095A CN202310440334.XA CN202310440334A CN116551095A CN 116551095 A CN116551095 A CN 116551095A CN 202310440334 A CN202310440334 A CN 202310440334A CN 116551095 A CN116551095 A CN 116551095A
- Authority
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- Prior art keywords
- brazing
- flux
- welding
- end ring
- solder
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- Pending
Links
- 238000005219 brazing Methods 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000003466 welding Methods 0.000 claims abstract description 60
- 230000004907 flux Effects 0.000 claims abstract description 59
- 238000005476 soldering Methods 0.000 claims abstract description 16
- 238000004140 cleaning Methods 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 230000006698 induction Effects 0.000 claims abstract description 12
- 235000011837 pasties Nutrition 0.000 claims abstract description 12
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 8
- 230000007547 defect Effects 0.000 claims abstract description 6
- 230000001680 brushing effect Effects 0.000 claims abstract description 4
- 239000011248 coating agent Substances 0.000 claims abstract description 4
- 238000000576 coating method Methods 0.000 claims abstract description 4
- 238000005520 cutting process Methods 0.000 claims abstract description 4
- 238000005498 polishing Methods 0.000 claims abstract description 4
- 229910000679 solder Inorganic materials 0.000 claims description 40
- 239000000945 filler Substances 0.000 claims description 18
- 229910052751 metal Inorganic materials 0.000 claims description 18
- 239000002184 metal Substances 0.000 claims description 18
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 14
- 229910052802 copper Inorganic materials 0.000 claims description 14
- 239000010949 copper Substances 0.000 claims description 14
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 6
- 239000011810 insulating material Substances 0.000 claims description 6
- 229910052700 potassium Inorganic materials 0.000 claims description 6
- 239000011591 potassium Substances 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 229910000599 Cr alloy Inorganic materials 0.000 claims description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 3
- 229910021538 borax Inorganic materials 0.000 claims description 3
- 239000000788 chromium alloy Substances 0.000 claims description 3
- 239000012459 cleaning agent Substances 0.000 claims description 3
- 230000009194 climbing Effects 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 238000005555 metalworking Methods 0.000 claims description 3
- 239000010445 mica Substances 0.000 claims description 3
- 229910052618 mica group Inorganic materials 0.000 claims description 3
- 229910052709 silver Inorganic materials 0.000 claims description 3
- 239000004332 silver Substances 0.000 claims description 3
- 239000004328 sodium tetraborate Substances 0.000 claims description 3
- 235000010339 sodium tetraborate Nutrition 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 6
- 239000010953 base metal Substances 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 description 18
- 239000006071 cream Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003137 locomotive effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
- B23K1/206—Cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/08—Auxiliary devices therefor
-
- 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
- H02K15/0056—Manufacturing winding connections
- H02K15/0068—Connecting winding sections; Forming leads; Connecting leads to terminals
-
- 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
-
- 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
- H02K15/12—Impregnating, heating or drying of windings, stators, rotors or machines
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Induction Machinery (AREA)
Abstract
The invention relates to the technical field of motor rotor conducting ring brazing, and discloses a motor rotor conducting ring brazing method, which comprises the following steps: s1, polishing and cleaning a rotor conducting bar to remove surface oxides, burrs and greasy dirt; s2, cleaning the surface of the rotor conducting bar by using alcohol, and then uniformly coating a paste brazing flux on the surface; s3, cleaning the guide bar, the end ring pool groove and the position 20mm around the welding seam with alcohol once, brushing the pasty brazing flux evenly in the guide bar and the end ring pool groove, cutting off the welding flux according to the length of the end ring pool groove, placing the welding flux in the pasty brazing flux, enabling the pasty brazing flux to be wrapped on the welding brazing flux evenly, and then airing. The invention reasonably selects and matches welding materials and soldering flux, and the conductivity of the soldered joint is close to that of the base metal, thus realizing the integral welding by induction heating, and the invention has the advantages of good mechanical strength, less welding defects, high integral quality and high welding efficiency of the weldment.
Description
Technical Field
The invention relates to the technical field of motor rotor conducting ring brazing, in particular to a motor rotor conducting ring brazing method x.
Background
At present, the single-pole asynchronous motor with the largest capacity is 25000KW 4P asynchronous motor which can be independently researched and manufactured in China, the rated current of the motor is 1588A, the starting current multiple is 5.54 times, the synchronous rotating speed of the motor reaches 1500r/min, the parameters provide higher technical requirements for the brazing of an end ring and a rotor conducting bar which are an important part of a motor rotor, reliable electric contact is required between the rotor conducting bar and the end ring, the joint area is large enough to ensure that the current flowing through the joint can not heat the joint under the conditions of starting and running the motor, the brazing quality directly influences the motor performance and reliability, and with the continuous development of the motor industry, particularly with the continuous development of wind power generation, urban rail, medium and high-speed electric locomotives, the leading position of a welding process of the copper alloy in the welding process of the stator parallel head of the alternating-current motor and the conducting bar of the rotor is important in the welding of the end ring, the output power of an intermediate frequency welder is far greater than that of a welding machine in the prior art, the welding of the end ring needs to be divided into dozens of sections, and the copper conducting bar is required to be welded, and the heating performance of the mechanical brazing material is longer and longer, and longer than the rated heating performance of the brazing material is influenced.
Therefore, there is a need to provide a new method for soldering a conductive ring of a rotor of an electric machine to solve the above-mentioned technical problems.
Disclosure of Invention
The invention provides a motor rotor conducting ring brazing method, which aims to solve the technical problem that the brazing heating time is relatively long and the mechanical property of a copper material is influenced by long-time heating.
The invention is realized by adopting the following technical scheme: a motor rotor conducting ring brazing method comprises the following steps:
s1, polishing and cleaning a rotor conducting bar to remove surface oxides, burrs and greasy dirt;
s2, cleaning the surface of the rotor conducting bar by using alcohol, and then uniformly coating a paste brazing flux on the surface;
s3, cleaning the guide bar, the end ring pool groove and the position 20mm around the welding seam with alcohol once, brushing the pasty brazing flux evenly in the guide bar and the end ring pool groove, cutting off the welding flux according to the length of the end ring pool groove, placing the welding flux in the pasty brazing flux, enabling the pasty brazing flux to be wrapped on the welding brazing flux evenly, and airing;
s4, connecting the prepared end ring inductor to a transformer, and uniformly placing a heat-resistant insulating material with the thickness of 2-4 mm on the surface of the inductor;
s5, uniformly placing the end ring on the induction generator, and uniformly placing 1-2 silver soldering lugs with the thickness of 0.5mm, which correspond to the conducting bars, on the welding surface of the end ring by utilizing the capillary action of the brazing filler metal;
s6, lifting the rotor at one end of the rotating shaft by using a bolt, slowly guiding the rotor to a welding tool, and keeping the clearance distances between the end ring and two sides of the guide bar consistent;
s7, placing a certain amount of solder at the welding seam position formed by the end ring and the guide bar, determining the amount of the solder according to the calculation result, and finally placing 1/3 volume of flux of the solder on the solder;
s8, hanging the rotor on a welding bench through shaft positioning, wherein the insulation distance between the induction coil and the end ring is 4mm+2mm, then heating the end ring in a sectional mode through an intermediate frequency induction mode, when the end ring starts to turn red, and the temperature near a braze joint reaches the standard, respectively assisting in heating the end head of the guide bar and the outer circle surface of the end ring through two braze torches until the brazing filler metal is completely and uniformly dissolved, floating the brazing flux on the surface of the brazing filler metal, rotating the rotor to the end ring of the next section after the brazing filler metal is completely solidified, and finishing the welding of the end ring of the next section and the guide bar according to the method of the step until the end ring and all the guide bars are welded;
s9, after welding, naturally cooling the conducting ring formed by the end ring and all conducting bars, then reducing the temperature to 150 ℃, removing soldering flux and residues by using a cleaning agent and a cleaning tool, drying by high-pressure air, and finally metalworking the excircle of the end ring.
As a further improvement of the above scheme, the cream solder is QJ101, and the components of QJ101 include: 30% of borax and 70% of potassium fluoborate, wherein the potassium fluoborate can reduce the melting point of the brazing flux and improve the capacity of the brazing flux for removing oxide films.
As a further improvement of the scheme, the heat-resistant insulating material is mica sheets, and the brazing temperature is 550-850 ℃.
As a further improvement of the scheme, the HL303 is selected as the solder, and the HL303 solder has good overflow property and gap filling capacity, and has smooth surface of a soldered joint, high joint strength, good impact load resistance and low resistivity.
As a further improvement of the scheme, the guide bars are made of pure copper, the end rings are made of chromium alloy copper, and the copper has high heat conductivity, so that the rest parts to be welded are in a heat affected zone in the welding process and are subjected to severe oxidation, the defects of fluidity and wettability of the brazing filler metal on the surface of the brazing filler metal can be greatly reduced, and the production efficiency can be greatly improved.
As a further improvement of the above solution, the flux is chemically compatible with the end rings, the bars and the braze and has sufficient activity over the entire brazing temperature range to ensure that a good quality braze joint is obtained.
As a further improvement of the above-mentioned solution, the flux has a specific gravity smaller than that of the solder and a proper viscosity at the soldering temperature, so that the molten solder can easily remove the flux from the soldered joint to prevent the problem of flux inclusion.
As a further improvement of the above scheme, the calculation formula of the solder is as follows:
V＝[π(D2-D1) 2 /4-L×h×N]×2+V 1 ×2×N(mm 3 )
the volume of the solder climbing fillet weld is as follows:
V 1 ＝(D2-D1)/2×K×K/2
in the formula: (D2-D1)/2 is the fillet length;
k is K multiplied by K/2 is the fillet area;
d2 is the end ring outer diameter;
l is the width of the guide bar;
n is the number of gaps between the guide bars;
d1 is the end ring inner diameter;
h is the thickness of the guide bar;
k is the fillet size.
As a further improvement of the above scheme, the total weight of the solder has the following formula:
G＝ρ*V(Kg)
in the formula: ρ is the density of copper;
therefore, the addition amount of the solder between each conducting bar and each conducting bar is as follows: g=g/N (Kg).
As a further improvement of the above solution, the aspect ratio of the weld is obtained by a heat input formula, the heat input formula being as follows:
E＝P/S
in the formula: e is heat input, J/m;
p is power, W;
s is the welding speed, mm/S;
therefore, the depth-to-width ratio of the welding seam can be obtained by selecting a proper heat input range.
Compared with the prior art, the invention has the beneficial effects that:
the invention reasonably selects and matches welding materials and soldering flux, and the conductivity of the soldered joint is close to that of the base metal, thus realizing the integral welding by induction heating, and the invention has the advantages of good mechanical strength, less welding defects, high integral quality and high welding efficiency of the weldment.
Drawings
FIG. 1 is a schematic diagram of an assembly structure of a conductive bar, solder and end ring according to the present invention.
Detailed Description
The invention will be further described with reference to the drawings and detailed description.
Referring to fig. 1, the method for soldering the conductive ring of the motor rotor of the present embodiment includes the following steps:
s1, polishing and cleaning a rotor conducting bar to remove surface oxides, burrs and greasy dirt;
s2, cleaning the surface of the rotor conducting bar by using alcohol, and then uniformly coating a paste brazing flux on the surface;
s3, cleaning the guide bar, the end ring pool groove and the position 20mm around the welding seam with alcohol once, brushing the pasty brazing flux evenly in the guide bar and the end ring pool groove, cutting off the welding flux according to the length of the end ring pool groove, placing the welding flux in the pasty brazing flux, enabling the pasty brazing flux to be wrapped on the welding brazing flux evenly, and airing;
s4, connecting the prepared end ring inductor to a transformer, and uniformly placing a heat-resistant insulating material with the thickness of 2-4 mm on the surface of the inductor;
s5, uniformly placing the end ring on the induction generator, and uniformly placing 1-2 silver soldering lugs with the thickness of 0.5mm, which correspond to the conducting bars, on the welding surface of the end ring by utilizing the capillary action of the brazing filler metal;
s6, lifting the rotor at one end of the rotating shaft by using a bolt, slowly guiding the rotor to a welding tool, and keeping the clearance distances between the end ring and two sides of the guide bar consistent;
s7, placing a certain amount of solder at the welding seam position formed by the end ring and the guide bar, determining the amount of the solder according to the calculation result, and finally placing 1/3 volume of flux of the solder on the solder;
s8, hanging the rotor on a welding bench through shaft positioning, wherein the insulation distance between the induction coil and the end ring is 4mm+2mm, then heating the end ring in a sectional mode through an intermediate frequency induction mode, when the end ring starts to turn red, and the temperature near a braze joint reaches the standard, respectively assisting in heating the end head of the guide bar and the outer circle surface of the end ring through two braze torches until the brazing filler metal is completely and uniformly dissolved, floating the brazing flux on the surface of the brazing filler metal, rotating the rotor to the end ring of the next section after the brazing filler metal is completely solidified, and finishing the welding of the end ring of the next section and the guide bar according to the method of the step until the end ring and all the guide bars are welded;
s9, after welding, naturally cooling the conducting ring formed by the end ring and all conducting bars, then reducing the temperature to 150 ℃, removing soldering flux and residues by using a cleaning agent and a cleaning tool, drying by high-pressure air, and finally metalworking the excircle of the end ring.
As a further improvement of the above scheme, the cream solder is QJ101, and the components of QJ101 include: 30% of borax and 70% of potassium fluoborate, wherein the potassium fluoborate can reduce the melting point of the brazing flux and improve the capacity of the brazing flux for removing oxide films.
As a further improvement of the scheme, the heat-resistant insulating material is mica sheets, and the brazing temperature is 550-850 ℃.
As a further improvement of the scheme, the HL303 is selected as the solder, and the HL303 solder has good overflow property and gap filling capacity, and has smooth surface of a soldered joint, high joint strength, good impact load resistance and low resistivity.
As a further improvement of the scheme, the guide bars are made of pure copper, the end rings are made of chromium alloy copper, and the copper has high heat conductivity, so that the rest parts to be welded are in a heat affected zone in the welding process and are subjected to severe oxidation, the defects of fluidity and wettability of the brazing filler metal on the surface of the brazing filler metal can be greatly reduced, and the production efficiency can be greatly improved.
As a further improvement of the above solution, the flux is chemically compatible with the end rings, the bars and the braze and has sufficient activity over the entire brazing temperature range to ensure that a good quality braze joint is obtained.
As a further improvement of the above-mentioned solution, the flux has a specific gravity smaller than that of the solder and a proper viscosity at the soldering temperature, so that the molten solder can easily remove the flux from the soldered joint to prevent the problem of flux inclusion.
As a further improvement of the above scheme, the calculation formula of the solder is as follows:
V＝[π(D2-D1) 2 /4-L×h×N]×2+V 1 ×2×N(mm 3 )
the volume of the solder climbing fillet weld is as follows:
V 1 ＝(D2-D1)/2×K×K/2
in the formula: (D2-D1)/2 is the fillet length;
k is K multiplied by K/2 is the fillet area;
d2 is the end ring outer diameter;
l is the width of the guide bar;
n is the number of gaps between the guide bars;
d1 is the end ring inner diameter;
h is the thickness of the guide bar;
k is the fillet size.
As a further improvement of the above scheme, the total weight of the solder has the following formula:
G＝ρ*V(Kg)
in the formula: ρ is the density of copper;
therefore, the addition amount of the solder between each conducting bar and each conducting bar is as follows: g=g/N (Kg).
As a further improvement of the above solution, the aspect ratio of the weld is obtained by a heat input formula, the heat input formula being as follows:
E＝P/S
in the formula: e is heat input, J/m;
p is power, W;
s is the welding speed, mm/S;
therefore, the depth-to-width ratio of the welding seam can be obtained by selecting a proper heat input range.
The invention reasonably selects and matches welding materials and soldering flux, and the conductivity of the soldered joint is close to that of the base metal, thus realizing the integral welding by induction heating, and the invention has the advantages of good mechanical strength, less welding defects, high integral quality and high welding efficiency of the weldment.
The above embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present invention are intended to be within the scope of the present invention as claimed.
Claims (10)
1. The motor rotor conducting ring brazing method is characterized by comprising the following steps of:
s1, polishing and cleaning a rotor conducting bar to remove surface oxides, burrs and greasy dirt;
s2, cleaning the surface of the rotor conducting bar by using alcohol, and then uniformly coating a paste brazing flux on the surface;
s3, cleaning the guide bar, the end ring pool groove and the position 20mm around the welding seam with alcohol once, brushing the pasty brazing flux evenly in the guide bar and the end ring pool groove, cutting off the welding flux according to the length of the end ring pool groove, placing the welding flux in the pasty brazing flux, enabling the pasty brazing flux to be wrapped on the welding brazing flux evenly, and airing;
s4, connecting the prepared end ring inductor to a transformer, and uniformly placing a heat-resistant insulating material with the thickness of 2-4 mm on the surface of the inductor;
s5, uniformly placing the end ring on the induction generator, and uniformly placing 1-2 silver soldering lugs with the thickness of 0.5mm, which correspond to the conducting bars, on the welding surface of the end ring by utilizing the capillary action of the brazing filler metal;
s6, lifting the rotor at one end of the rotating shaft by using a bolt, slowly guiding the rotor to a welding tool, and keeping the clearance distances between the end ring and two sides of the guide bar consistent;
s7, placing a certain amount of solder at the welding seam position formed by the end ring and the guide bar, determining the amount of the solder according to the calculation result, and finally placing 1/3 volume of flux of the solder on the solder;
s8, hanging the rotor on a welding bench through shaft positioning, wherein the insulation distance between the induction coil and the end ring is 4mm+2mm, then heating the end ring in a sectional mode through an intermediate frequency induction mode, when the end ring starts to turn red, and the temperature near a braze joint reaches the standard, respectively assisting in heating the end head of the guide bar and the outer circle surface of the end ring through two braze torches until the brazing filler metal is completely and uniformly dissolved, floating the brazing flux on the surface of the brazing filler metal, rotating the rotor to the end ring of the next section after the brazing filler metal is completely solidified, and finishing the welding of the end ring of the next section and the guide bar according to the method of the step until the end ring and all the guide bars are welded;
s9, after welding, naturally cooling the conducting ring formed by the end ring and all conducting bars, then reducing the temperature to 150 ℃, removing soldering flux and residues by using a cleaning agent and a cleaning tool, drying by high-pressure air, and finally metalworking the excircle of the end ring.
2. The method for soldering an electric motor rotor conductive ring as recited in claim 1, wherein said paste flux is QJ101, and the components of QJ101 include: 30% of borax and 70% of potassium fluoborate, wherein the potassium fluoborate can reduce the melting point of the brazing flux and improve the capacity of the brazing flux for removing oxide films.
3. The method for brazing a conductive ring of a motor rotor according to claim 1, wherein the heat-resistant insulating material is a mica sheet, and the brazing temperature is 550-850 ℃.
4. The method for soldering a conductive ring of a motor rotor according to claim 1, wherein the solder is HL303, and the HL303 solder has good fluidity and gap filling capability, and the soldered joint has smooth surface, high joint strength, good impact load resistance and low resistivity.
5. The method for brazing the conductive ring of the motor rotor according to claim 1, wherein the conducting bars are made of pure copper, the end rings are made of chromium alloy copper, and the copper has high heat conductivity, so that the rest parts to be welded are in a heat affected zone in the welding process and are severely oxidized, the defects of fluidity and wettability of the brazing filler metal on the surface of the brazing filler metal can be greatly reduced, and the production efficiency can be greatly improved.
6. The method of brazing an electrically conductive ring for a motor rotor according to claim 1, wherein the flux is chemically compatible with the end rings, the bars and the braze and has sufficient activity throughout the brazing temperature range to ensure a good quality braze joint.
7. The method of claim 1, wherein the flux has a specific gravity less than that of the solder and a suitable viscosity at the soldering temperature to enable the molten solder to easily remove the flux from the solder joint to prevent the flux slag inclusion.
8. The method of brazing a conductive ring of a motor rotor according to claim 1, wherein the solder is calculated as follows:
V＝[π(D2-D1) 2 /4-L×h×N]×2+V 1 ×2×N(mm 3 )
the volume of the solder climbing fillet weld is as follows:
V 1 ＝(D2-D1)/2×K×K/2
in the formula: (D2-D1)/2 is the fillet length;
k is K multiplied by K/2 is the fillet area;
d2 is the end ring outer diameter;
l is the width of the guide bar;
n is the number of gaps between the guide bars;
d1 is the end ring inner diameter;
h is the thickness of the guide bar;
k is the fillet size.
9. The method of brazing a conductive ring of a motor rotor according to claim 1, wherein the total weight of the solder is calculated as:
G＝ρ*V(Kg)
in the formula: ρ is the density of copper;
therefore, the addition amount of the solder between each conducting bar and each conducting bar is as follows: g=g/N (Kg).
10. The method of brazing an electrically conductive ring of a rotor of an electric machine according to claim 1, wherein the aspect ratio of the weld is obtained by a heat input formula, the heat input formula being as follows:
E＝P/S
in the formula: e is heat input, J/m;
p is power, W;
s is the welding speed, mm/S;
therefore, the depth-to-width ratio of the welding seam can be obtained by selecting a proper heat input range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310440334.XA CN116551095A (en) | 2023-04-23 | 2023-04-23 | Motor rotor conducting ring brazing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310440334.XA CN116551095A (en) | 2023-04-23 | 2023-04-23 | Motor rotor conducting ring brazing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116551095A true CN116551095A (en) | 2023-08-08 |
Family
ID=87487121
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310440334.XA Pending CN116551095A (en) | 2023-04-23 | 2023-04-23 | Motor rotor conducting ring brazing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116551095A (en) |
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2023
- 2023-04-23 CN CN202310440334.XA patent/CN116551095A/en active Pending
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