Stator end-to-end induction brazing device

Abstract

The invention relates to a stator end-to-end induction brazing device, which comprises an alternating current power supply device, an inductor, a cooling system, a coupling device and a clamping device, and is characterized in that the inductor converts current into a magnetic field through a chip-type induction conductor which is packaged in an insulating material and is electrically connected with the alternating current power supply device. And as the current density is higher, the orientation of magnetic lines is controllable, and the welding efficiency is improved by more than 30%. Preferably, the clamping device comprises a moving arm arranged on the lower portion of the support and a connecting arm with a rotating shaft, a gear and a clamping jaw arranged on the lower portion, the driving mechanism drives the moving arm to move up and down, the clamping jaw on the rotating shaft is driven to rotate through meshing of a rack and the gear, and clamping and loosening of the stator parallel head arranged between the top plate of the support and the clamping jaw are achieved. The induction brazing device is suitable for brazing of aluminum stator parallel heads, convenient to operate, high in welding efficiency, good in welding quality, free of splashing and small in influence on peripheral metal parts.

Description

Technical Field

[0001] This invention relates to the field of induction brazing technology, and more specifically to a stator parallel induction brazing device. Background Technology

[0002] The design and manufacturing capabilities of large-scale wind power, thermal power, hydropower, nuclear power, and gas turbine equipment are a comprehensive reflection of the level of the major equipment manufacturing industry. With the continuous increase in the capacity of individual units and the rapid changes in product structure, manufacturing difficulty is increasing, and the requirements for manufacturing technology are becoming increasingly stringent. The stator is one of the key components of a motor, and the manufacturing of stator windings is also one of the key technologies in the manufacturing of large motors. Brazing technology is mainly used in the manufacturing of stator windings to weld the stator joints.

[0003] Brazing is a welding method that uses a filler metal with a melting temperature lower than that of the base metal. At a temperature below the base metal's melting point but above the filler metal's melting point, the liquid filler metal wets, spreads, and flows capillarily on the base metal surface, melting and diffusing with it to achieve a connection between structural components. Induction brazing utilizes the principle of alternating electromagnetic induction, employing the eddy current effect of an alternating magnetic field to heat the workpiece, causing the filler metal to melt and fill the gaps, thus achieving brazing. Induction brazing is widely used due to its advantages such as high heating efficiency, fast speed, good controllability, less solder oxidation, and high welding efficiency.

[0004] Previously, motor stators were primarily made of copper. However, due to my country's scarce copper resources and persistently high copper prices, the trend of aluminum replacing copper has become increasingly apparent in recent years. In the past, when copper was the main material, stator joints were brazed using various methods, including flame brazing, resistance brazing, and induction brazing. Copper has a melting point of 1083.4℃, and the actual brazing temperature is generally between 700 and 800℃. During welding, the base material is less prone to overheating and strength loss, making welding relatively easy and ensuring quality. However, with aluminum replacing copper, pure aluminum has a melting point of 660℃, aluminum alloys have even lower melting points, and aluminum brazing filler metal (4047) has a melting point of 575–585℃. The brazing temperature is close to the melting point of the base material, making it highly susceptible to overheating and strength loss. Therefore, most industries use argon arc welding. However, argon arc welding has high welding temperatures (requiring water cooling), produces a lot of spatter (requiring protection), has low efficiency, and requires highly skilled operators. There is an urgent need to develop a high-quality, high-efficiency brazing device suitable for aluminum stator joints.

[0005] The stator of a motor has numerous parallel joints, requiring high welding quality. These joints must not only possess excellent electrical conductivity but also withstand the vibration and strong mechanical stresses experienced during normal motor operation, demanding extremely high welding quality. If defects occur during the welding process, the joint resistance will increase, leading to localized overheating during operation. This can damage the insulation material of the joint, even causing it to crack and potentially resulting in an electrical accident. Therefore, the welded joints of the motor stator must possess excellent electrical conductivity, mechanical properties, corrosion resistance, aging resistance, and thermal cycling resistance to ensure long-term safe use.

[0006] In the brazing of stator joints in motors, limiting the gap of the brazed joint is crucial for improving welding efficiency and quality, from the perspective of stator joint assembly and positioning. If the joint gap is too small, gas cannot escape, leading to defects such as incomplete penetration and porosity; if the joint gap is too large, capillary action weakens, preventing the brazing filler metal from filling the gap completely, resulting in reduced brazed joint strength. Significant variations in the joint gap can greatly affect the weld density and joint strength. Since the stator joint consists of multiple strands of wire with uneven spacing between the strands at the ends, a clamping device is required during stator joint brazing to control the spacing between the strands.

[0007] CN103909317A discloses a method for welding the stator coil joint of a shielded motor. The method uses medium-frequency induction brazing to weld the copper stator coil joint. The special induction coil is made of a square pure copper tube bent and coated with an aluminum oxide coating. The workpiece is fixed and clamped using auxiliary tools, and then induction brazing is performed using a handheld special induction coil.

[0008] CN206105099U discloses an induction device for brazing generator stators, wherein the induction part is made of copper tubes wound together, and coolant can be introduced into the copper tubes. The metal workpiece to be welded is clamped by two clamping heads.

[0009] CN219358203U discloses a stator parallel welding heating device for motors, including an inductor handheld component, a drive component, and a clamping component connected to the power output end of the drive component. The inductor handheld component includes a support rod and a welding rod. The power output rod of the drive component is connected to a sliding seat. The clamping component includes a clamping block that contacts and clamps the parallel wire and a connecting platform located at the upper end of the clamping block and connected to the sliding seat. During welding heating, the iron core and the induction coil are located at the end of the clamping component away from the induction welding machine. One side of the parallel wire overlaps the iron core and the induction coil. The power output rod of the drive component drives the sliding seat, the connecting platform, and the clamping block to move up and down to clamp or release the parallel wire. It utilizes a pneumatic drive component to move the clamping component up and down to clamp the parallel wire onto the induction coil. This clamping method limits its applicability to stator parallel connections with only one type of overlap.

[0010] The induction brazing devices disclosed in these patents are all for induction brazing of copper stators. When brazing aluminum stator joints, the brazing temperature is close to the melting point of the base material, and the operating space is very narrow (usually only 12-30mm). The induction coils made of copper tubes are limited by the mechanical properties of copper tubes and the pressure drop of the cooling medium, making it impossible to manufacture induction coils of the required size. In addition, the large magnetic field coverage area easily leads to the surrounding stator joints and metal clamps heating up and deforming. Therefore, existing induction brazing devices are not suitable for induction brazing of aluminum stator joints.

[0011] Therefore, there is an urgent need to develop an induction brazing device suitable for parallel brazing of aluminum stators. Summary of the Invention

[0012] To address the aforementioned technical problems, the present invention aims to provide a stator parallel joint induction brazing device suitable for brazing aluminum stator parallel joints. This device is easy to operate, has high welding efficiency, produces good welding quality, eliminates spatter, and has minimal impact on surrounding metal components.

[0013] To achieve the above objectives, the present invention provides a stator parallel induction brazing device, comprising an AC power supply device, an inductor, a cooling system, a coupling device, and a clamping device, characterized in that the inductor converts current into a magnetic field through a sheet-type sensing conductor encapsulated in an insulating material and connected to the AC power supply device circuit.

[0014] In a preferred embodiment, the stator parallel head induction brazing device of the present invention is characterized in that the clamping device includes a moving arm disposed at the lower part of the bracket and a connecting arm disposed at the lower part with a rotating shaft, a gear and a chuck. The driving mechanism drives the moving arm to move up and down, and through the meshing of the rack and gear, drives the chuck on the rotating shaft to rotate, thereby realizing the clamping and loosening of the stator parallel head disposed between the top plate of the bracket and the chuck.

[0015] In a preferred embodiment, the stator parallel induction brazing apparatus of the present invention is characterized in that the inductor comprises: a housing made of insulating material; a cooling channel located within the housing; a cooling medium inlet / outlet pipe passing through the housing; and a plate sensing conductor located on one side of the inner wall of the housing, wherein the plate sensing conductor is connected to the cooling medium inlet / outlet pipe.

[0016] In a preferred embodiment, the stator parallel induction brazing device of the present invention is characterized in that the clamping device includes: a bracket for fixed connection with the welding device, the bracket including a top plate having at least one perforation, a connecting arm extending downward on at least one side of the top plate, a moving arm having a drive mechanism at the upper part and a rack structure at the lower part passing through the perforation on the top plate of the bracket, a rotating shaft at the lower part of the connecting arm having a gear and a pawl, and the lower part of the connecting arm being configured to engage the gear with the rack of the moving arm.

[0017] In a preferred embodiment, the stator parallel induction brazing device of the present invention is characterized in that the insulating material is selected from one or more of inorganic materials, polymer materials and their composite materials.

[0018] In a preferred embodiment, the stator parallel induction brazing device of the present invention is characterized in that the insulating material is selected from ceramic or glass fiber resin composite materials.

[0019] In a preferred embodiment, the stator parallel induction brazing device of the present invention is characterized in that the inductor is selected from copper, aluminum, gold, silver metals and alloys.

[0020] In a preferred embodiment, the stator parallel induction brazing device of the present invention is characterized in that the cooling channel inside the housing is larger than the volume of the sheet-type sensing conductor.

[0021] In a preferred embodiment, the stator parallel induction brazing device of the present invention is characterized in that the clamping device is configured as a double-sided clamping structure including two sets of connecting arms and moving arms, and the driving mechanism includes a cylinder.

[0022] In a preferred embodiment, the stator parallel induction brazing device of the present invention is characterized in that the clamping device is configured as a portal frame including a top plate and symmetrical connecting arms on the left and right sides; the upper part of the bracket includes a back plate connected to one side of the top plate, and the driving mechanism is fixedly connected to the back plate; the lower part of the connecting arm is configured to bend inward toward the center of the portal frame; the top plate of the portal frame is symmetrically provided with through holes on the left and right sides, and connecting arms extending downward are provided on both the front and rear sides of the through holes; gears on both the left and right sides are provided on the rotating shaft passing through the lower part of the front and rear connecting arms, the gears are located between the two connecting arms, and the pawls are located on the outside of the connecting arms.

[0023] The present invention has the following beneficial effects: In the stator parallel induction brazing device of the present invention, the inductor converts current into a magnetic field through a plate-type sensing conductor encapsulated in insulating material and connected to the AC power supply circuit. Structurally, the sensing conductor is brought close to the heated area, making full use of the proximity effect to attract more magnetic lines of force, effectively guiding the direction and density of the magnetic field, and focusing it on the designated heating area, resulting in fast heating rate and high efficiency. During the stator parallel induction brazing process, there is no spatter and minimal impact on surrounding metal parts. Due to the higher current density and controllable magnetic line orientation, the welding efficiency is increased by more than 30%, and the required power is reduced, achieving effective energy saving. By arranging a cooling medium flow channel on the outside of the sensing conductor, the temperature of the inductor itself can be stabilized to achieve stable output conditions. At the same time, the circulating cooling medium can also weaken or relatively shield the magnetic field from dissipating to the outside, reducing the impact on surrounding products or metal clamps. The clamping device uses a rack at the bottom of the moving arm to mesh with a gear on the lower rotating shaft of the connecting arm, driving the chuck on the rotating shaft to rotate, thereby achieving the clamping and loosening of the stator parallel joint set between the top plate of the support and the chuck. With its simple structure and ease of use, the stator clamping distance is adjustable, providing high clamping tightness and good stability, thus ensuring welding quality. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a stator parallel induction brazing device according to a preferred embodiment of the present invention.

[0025] Figure 2 This is a front view of a stator parallel induction brazing apparatus according to a preferred embodiment of the present invention.

[0026] Figure 3 This is a schematic diagram of the main body structure of the sensor housing in a preferred embodiment of the present invention.

[0027] Figure 4 This is a schematic diagram of the conductive circuit of the sensor in a preferred embodiment of the present invention.

[0028] Figure 5 (a) and Figure 5 (b) Photographs of the welded samples from test examples 3 and 4, respectively.

[0029] In the diagram: Gear 1, Shaft 2, Bracket 3, Claw 4, Drive Mechanism 5, Moving Arm 6, Parallel Head 7, Heat Insulation Block 8, Sensor 9. Detailed Implementation

[0030] The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. The embodiments given are only for better illustrating the present invention and are not intended to limit the scope of the present invention.

[0031] The present invention relates to a stator parallel induction brazing device, comprising an AC power supply, an inductor, a cooling system, a coupling device, and a clamping device, characterized in that the inductor converts current into a magnetic field through a sheet-type sensing conductor encapsulated in an insulating material and connected to the AC power supply circuit.

[0032] In a preferred embodiment, the stator parallel induction brazing apparatus of the present invention is characterized in that the inductor comprises: a housing made of insulating material; a cooling channel located within the housing; a cooling medium inlet / outlet pipe passing through the housing; and a sheet-type sensing conductor located on one side of the inner wall of the housing, wherein the sensing conductor is connected to the cooling medium inlet / outlet pipe.

[0033] The method employs a sheet-type sensing conductor encapsulated within an insulating material, utilizing the skin effect to allow current to flow across the surface of the sensing conductor. The alternating current flowing through it generates an alternating induced electromagnetic field. The magnetic lines of force of this induced electromagnetic field pass through the metal product being processed, creating numerous eddy currents on its surface. The continuous action of these eddy currents causes the workpiece to heat up, and the accumulated heat continues until the target temperature is reached.

[0034] The chip sensing conductor is located on the inner wall of the housing, close to the area to be heated. Structurally, this proximity of the sensing conductor to the heated area leverages the high-frequency proximity effect to attract more magnetic lines of force, effectively guiding the direction and density of the magnetic field and concentrating it specifically towards the designated heating area. Furthermore, chip sensing conductors offer significantly better fabrication performance than tubular conductors, enabling the creation of smaller, more precise, and more complex inductors.

[0035] The sensing conductor is preferably a metal sheet made of a metal or alloy with good conductivity, preferably made of a metal selected from copper, aluminum, gold, silver and alloys, more preferably made of a metal selected from copper, aluminum and alloys, even more preferably made of a metal selected from copper and alloys, and most preferably made of pure copper.

[0036] The metal sheet, transition metal tube, and conductive mounting base are connected, for example by riveting, to form a three-dimensional conductive circuit. The metal sheet and transition metal tube are supported by the housing. The transition metal tube, which serves as the inlet and outlet pipe for the cooling medium, passes through both sides of the housing, and each through-hole is sealed with an adhesive sealing plate.

[0037] The shell is made of an insulating material, which is selected from one or more inorganic materials, polymer materials, and their composites. In addition to insulation, the material used to make the shell is preferably a high-temperature resistant, easily processed, and sealable material. In a preferred embodiment, the insulating material is selected from one or more of ceramics, mica, asbestos, quartz, glass fiber, polyester, alkyd resin, epoxy resin, silicone, polyvinyl chloride, polyimide, and ethylene propylene rubber; more preferably, it is selected from ceramic or glass fiber resin composites; and most preferably, FR4 glass fiber or ceramic materials are used.

[0038] The sensor of this invention is disposed within a cooling medium channel inside the housing. Water is preferred as the cooling medium. The cooling medium enters the housing through a cooling medium inlet pipe on one side, flows through the cooling medium channel, and exits through a cooling medium outlet pipe on the other side. The circulating cooling medium within the cooling medium channel stabilizes the sensor's temperature, ensuring stable output. Simultaneously, the circulating cooling medium blocks most of the ineffective magnetic field emitted towards the outside of the heating zone, reducing magnetic field dissipation and providing localized shielding, thereby minimizing the impact on surrounding parts or metal clamps. Depending on cooling requirements, the cooling channel within the housing is preferably larger than the volume of the sensing conductor, more preferably twice the volume of the sensing conductor.

[0039] The sensing conductor of the sensor of this invention can be processed using CNC machining methods such as wire cutting, and then encapsulated together with insulating materials that have good processing performance, allowing for flexible and diverse manufacturing methods. The sensor of this invention can use various induction heating methods such as power frequency, medium frequency, high frequency, and ultra-high frequency, with medium frequency or high frequency brazing being preferred.

[0040] In a preferred embodiment, the stator parallel head induction brazing device of the present invention is characterized in that the clamping device includes a moving arm disposed at the lower part of the bracket and a connecting arm disposed at the lower part with a rotating shaft, a gear and a chuck. The driving mechanism drives the moving arm to move up and down, and through the meshing of the rack and gear, drives the chuck on the rotating shaft to rotate, thereby realizing the clamping and loosening of the stator parallel head disposed between the top plate of the bracket and the chuck.

[0041] In a preferred embodiment, the stator parallel induction brazing device of the present invention is characterized in that the clamping device includes: a bracket for fixed connection with the welding device, the bracket including a top plate with at least one perforation, a connecting arm extending downward on at least one side of the top plate, a moving arm with a drive mechanism at the upper part and a rack structure at the lower part passing through the perforation on the top plate of the bracket, a rotating shaft at the lower part of the connecting arm, a gear and a pawl on the rotating shaft, and the lower part of the connecting arm configured to allow the gear to mesh with the rack of the moving arm. Any existing driving method can be used. In a preferred embodiment, the drive device includes a cylinder, an electric push rod, a servo push rod, a ball screw and nut pair, and more preferably, the drive mechanism includes a cylinder. In a preferred embodiment, the clamping device is configured as a double-sided clamping structure including two sets of connecting arms and moving arms. Depending on the actual situation of the stator parallel joint being welded, the two moving arms can be driven by one cylinder, or the two moving arms can be driven by two separate cylinders.

[0042] In a preferred embodiment, downwardly extending connecting arms are provided on both sides of the perforation on the top plate of the bracket. Gears are mounted on a rotating shaft passing through the lower parts of the two connecting arms, with the gears located between the two connecting arms. Claws are located on the outer sides of the connecting arms. In another preferred embodiment, the bracket is configured as a portal frame bracket including a top plate and symmetrical connecting arms on both sides. Preferably, the lower part of the connecting arms is bent inwards towards the center of the portal frame. Preferably, the top plate of the portal frame bracket has symmetrically provided perforations on both sides, and downwardly extending connecting arms are provided on both the front and rear sides of the perforations. Gears on both sides are mounted on a rotating shaft passing through the lower parts of the front and rear connecting arms, with the gears located between the two connecting arms. Claws are located on the outer sides of the connecting arms. In a preferred embodiment, the upper part of the bracket for the clamping device for parallel welding of the motor stator includes a back plate connected to one side of the top plate, and the drive mechanism is fixedly connected to the back plate.

[0043] Figure 1-2 This invention illustrates a stator parallel head induction brazing device according to an embodiment of the present invention. A moving arm 6, with a drive mechanism 5 at the top and a rack structure at the bottom, passes through a perforation in the top plate of a support 3. The rack at the bottom of the moving arm 6 meshes with a gear 1 on a rotating shaft 2 at the bottom of the connecting arm. In use, the drive mechanism 5 drives the moving arm 6 to move up and down. The up-and-down movement of the rack at the bottom of the moving arm 6 drives the gear 1 meshing with it to rotate, which in turn drives the chuck 4 on the rotating shaft 2 to rotate, thereby clamping and releasing the stator parallel head 7 located between the top plate of the support 3 and the chuck 4. A heat-insulating block 8 is provided between the top plate and the stator parallel head, and sensors 9 are placed on both sides of the stator parallel head.

[0044] Example 1

[0045] A 1mm thick copper sheet is wire-cut into the required shape and size using a CNC machine tool. The main body of the shell is made of FR4 fiberglass insulation material, with 5mm deep grooves on both sides. Through holes are provided on both sides to connect the grooves. Figure 3 As shown. The copper sheet is placed and secured within the main structure. The transition copper pipe, serving as the inlet and outlet pipe for the cooling medium, is inserted into the through holes on both sides of the housing. Then, the copper sheet, transition copper pipe, and conductive mounting base are riveted together to form a three-dimensional conductive circuit, as shown. Figure 4 As shown. The two sides of the main structure are sealed with sealing plates, forming a cooling medium channel between the copper sheet, the groove, and the sealing plates. This yields the sensor 1 of the present invention.

[0046] The clamping device's support is configured as a portal frame, including a top plate and symmetrical connecting arms on both sides. The upper part of the support includes a back plate connected to one side of the top plate, and the drive mechanism is fixedly connected to the back plate. The lower part of the connecting arms is bent inwards towards the center of the portal frame. Symmetrical through-holes are provided on both sides of the top plate of the portal frame, and downward-extending connecting arms are provided on both the front and rear sides of the through-holes. Gears on both sides are mounted on rotating shafts passing through the lower parts of the front and rear connecting arms, with the gears located between the two connecting arms. The pawls are located on the outer sides of the connecting arms. A moving arm, equipped with a drive mechanism at the top and a rack structure at the bottom, passes through the through-holes in the top plate of the support. The lower part of the connecting arm is configured to engage the gears with the rack of the moving arm.

[0047] like Figure 1-2 As shown, the sensor 1, clamping device, coupling device, AC power supply device, and cooling system are assembled into an induction brazing device.

[0048] Comparative Example 1

[0049] An induction coil with a shell shape and size similar to that of Example 1 was wound using a 5mm*5mm square copper tube. A comparison inductor 1 was prepared using conventional methods. It was then assembled with a clamping device, a coupling device, an AC power supply, and a cooling system to form an induction brazing device.

[0050] Test Example 1

[0051] The specifications of the product to be welded are: aluminum electromagnetic wire (3×7.5mm) 1A60; overlap length 25mm; 3-to-3 overlap layers; double-row overlap. The product to be welded is clamped using a clamping structure.

[0052] Using the induction brazing apparatus described in Example 1, with water as the cooling medium, a gap of 1.75 mm between the inductor and the product to be brazed, an output current frequency set to 20 kHz, and a welding current of 100 A applied, the product was induction brazed for 10 seconds. A welded sample 1 was obtained.

[0053] Observations: The fixture structure did not glow red or deform, but experienced a temperature rise of 50°C. The weld points on the machined parts were uniform, with no missing welds or slough defects.

[0054] Test Example 2

[0055] The specifications of the product being welded are the same as those in Test Example 1.

[0056] Using the induction brazing apparatus of Comparative Example 1, with water as the cooling medium, a gap of 1.75 mm between the inductor and the product to be brazed, an output current frequency of 20 kHz, and a welding current of 100 A, an induction brazing was performed on a product of the same specifications as in Test Example 1 for 30 seconds. This yielded welding comparison sample 1.

[0057] Observations revealed: The fixture structure was red-hot and severely deformed. The welds on the workpiece were uneven, with incomplete welds and slough defects.

[0058] Test Example 3

[0059] The specifications of the product to be welded are: aluminum electromagnetic wire (3×7.5mm) 1A60; overlap length 25mm; number of overlap layers 3 to 3; single row overlap. The product to be welded is clamped using a clamping structure.

[0060] Using the induction brazing apparatus of Example 1, with water as the cooling medium, a gap of 1.75 mm between the inductor and the product to be brazed, an output current frequency of 20 kHz, and a welding current of 100 A, the product was induction brazed for 6 seconds. This resulted in welded sample 2.

[0061] Observations: The fixture structure remained unchanged, accompanied by a temperature rise of 40°C. The weld points on the machined workpiece were uniform, without any missing welds or slag defects (see attached document). Figure 5 (a).

[0062] Test Example 4

[0063] The specifications of the product being welded are the same as those in Test Example 3.

[0064] Using the induction brazing apparatus of Comparative Example 1, with water as the cooling medium, a gap of 1.75 mm between the inductor and the product to be brazed, an output current frequency of 20 kHz, and a welding current of 100 A, an induction brazing was performed on a product of the same specifications as in Test Example 3 for 20 seconds. This resulted in welding comparison sample 2.

[0065] The fixture structure was observed to be red-hot and severely deformed. The welds on the workpiece were uneven, with incomplete welds and slough defects (see attached image). Figure 5 (b)

[0066] Sample 2 and control sample 2 obtained from test examples 3 and 4 were tested. Tensile testing was performed according to GB / T 11363, and macroscopic metallographic testing was performed according to GB / T 26955. The results are shown in the table below:

[0067] Sample 2 Comparison Sample 2 DC resistance The resistance of the sample before and after temperature rise is less than or equal to the resistance of the base material. The resistance of the sample before and after temperature rise is less than or equal to the resistance of the base material. Temperature rise upon power-on Constant temperature 75℃, temperature difference ≤1℃ Constant temperature 75℃, temperature difference ≤1℃ stretching The fracture location is either in the base material or in the non-heat-affected zone. The fracture occurred at the location of the poor solder joint. Macro Metallography The percentage of the largest defects is ≤20%. The largest defect accounts for ≥20%

[0068] Test results show that the brazing of aluminum windings using the inductor of this invention meets the technical requirements. Traditional copper tube inductor coils have low heating rates, long welding times, severe fixture overheating, uneven weld joints on the workpiece, and defects such as missing welds and slack, making them unsuitable for batch welding operations. The inductor of this invention has high heating rates, short welding times, slight fixture temperature rise, uniform weld joints on the workpiece, and no defects such as missing welds or slack, making it suitable for batch welding operations.

Claims

1. A stator parallel induction brazing device, comprising an AC power supply, an inductor, a cooling system, a coupling device, and a clamping device, characterized in that... The sensor converts electric current into a magnetic field through a chip sensing conductor encapsulated in insulating material and connected to an AC power supply circuit.

2. The stator parallel induction brazing device according to claim 1, characterized in that... The clamping device includes a moving arm located at the lower part of the bracket and a connecting arm with a rotating shaft, gear and pawl at the lower part. The drive mechanism drives the moving arm to move up and down. Through the meshing of the rack and gear, the pawl on the rotating shaft is driven to rotate, thereby realizing the clamping and loosening of the stator head located between the top plate of the bracket and the pawl.

3. The stator parallel induction brazing device according to claim 1 or 2, characterized in that the inductor... include: A housing made of insulating material; a cooling channel located within the housing; a cooling medium inlet / outlet pipe passing through the housing; and a plate sensing conductor located on one side of the inner wall of the housing, wherein the plate sensing conductor is connected to the cooling medium inlet / outlet pipe.

4. The stator parallel induction brazing device according to claim 1 or 2, characterized in that... The clamping device includes: a bracket for fixed connection with a welding device, the bracket including a top plate with at least one perforation, a connecting arm extending downward on at least one side of the top plate, a moving arm with a drive mechanism at the top and a rack structure at the bottom passing through the perforation on the top plate of the bracket, a rotating shaft at the bottom of the connecting arm with a gear and a pawl, and the bottom of the connecting arm being configured to engage the gear with the rack of the moving arm.

5. The stator parallel induction brazing apparatus according to claim 1 or 2, characterized in that... The insulating material is selected from one or more of inorganic materials, polymer materials and their composite materials.

6. The stator parallel induction brazing apparatus according to claim 1 or 2, characterized in that... The insulating material is selected from ceramic or glass fiber resin composite materials.

7. The stator parallel induction brazing device according to claim 1 or 2, characterized in that... The inductor is selected from one of the following metals and alloys: copper, aluminum, gold, and silver.

8. The stator parallel induction brazing apparatus according to claim 1 or 2, characterized in that... The cooling channels inside the housing are larger than the volume of the chip sensing conductor.

9. The stator parallel induction brazing device according to claim 2, characterized in that... The clamping device is configured as a double-sided clamping structure including two sets of connecting arms and moving arms, and the driving mechanism includes a cylinder.

10. The stator parallel induction brazing device according to claim 9, characterized in that... The clamping device is configured as a portal frame consisting of a top plate and symmetrical connecting arms on the left and right sides. The upper part of the frame includes a back plate connected to one side of the top plate, and the drive mechanism is fixedly connected to the back plate. The lower part of the connecting arms is configured to bend inward toward the center of the portal frame. The top plate of the portal frame has symmetrical perforations on the left and right sides, and connecting arms extending downward are provided on both the front and rear sides of the perforations. The gears on the left and right sides are both mounted on the rotating shafts that pass through the lower parts of the front and rear connecting arms. The gears are located between the two connecting arms, and the pawls are located on the outside of the connecting arms.

Images