CN111112785A - Combined flexible fixture for brazing of outer rotor neodymium-iron-boron permanent magnet of permanent magnet motor - Google Patents
Combined flexible fixture for brazing of outer rotor neodymium-iron-boron permanent magnet of permanent magnet motor Download PDFInfo
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- CN111112785A CN111112785A CN202010051445.8A CN202010051445A CN111112785A CN 111112785 A CN111112785 A CN 111112785A CN 202010051445 A CN202010051445 A CN 202010051445A CN 111112785 A CN111112785 A CN 111112785A
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- 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
- B23K3/087—Soldering or brazing jigs, fixtures or clamping means
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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
- H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
Abstract
The invention discloses a combined flexible fixture for brazing an outer rotor neodymium iron boron permanent magnet of a permanent magnet motor, and belongs to the technical field of welding of neodymium iron boron permanent magnets. The clamp is characterized in that: the fixture is composed of a bottom plate, a positioning bolt, a positioning sliding plate, a center rod, a center seat, a pressing guide rod, a spring sliding plate, a groove-shaped spring pressing plate, an arch-shaped positioning plate, a matched bolt, a nut and a gasket, is a combined detachable independent element structure, and combines the components of the fixture according to the size of a permanent magnet-rotor to be brazed. Four groups of springs of the fixture keep dynamic balance through the pressing guide rods and the arched positioning plate, accurately fix and position the permanent magnet-rotor, and provide flexible pressure for the permanent magnet-rotor in the vacuum brazing process, so that the permanent magnet-rotor deforms and coordinates, and the brazing requirement is met. The invention adopts a flexible pressing method and a combined structure, and has the advantages of simple structure, convenient use, strong reliability, low cost, long service life and good economy.
Description
Technical Field
The invention belongs to the technical field of welding of neodymium iron boron permanent magnets, and particularly relates to a combined flexible fixture for brazing of an outer rotor neodymium iron boron permanent magnet of a permanent magnet motor.
Background
The rare earth permanent magnet synchronous motor has the advantages of high power density, high energy conversion efficiency (about 90-95%), reliable operation, small size, light weight and the like, is widely applied to the fields of aerospace, national defense, transportation, petrochemical industry, machinery, automatic control, medical treatment and the like, and the application field is continuously expanded. The rare earth permanent magnet synchronous motor mainly comprises an end cover, a rotor, a stator and the like, wherein a rare earth permanent magnet (a rotor permanent magnet synchronous motor and a stator permanent magnet synchronous motor) is fixedly arranged on the rotor or the stator, and the rare earth permanent magnet is mainly a sintered neodymium iron boron permanent magnet and has the advantages of higher magnetic energy density and the like compared with the bonded and hot-pressed neodymium iron boron permanent magnet. For a rotor permanent magnet synchronous motor, the rotor permanent magnet synchronous motor is generally divided into three types, namely a surface-mounted type permanent magnet synchronous motor, an embedded type permanent magnet synchronous motor (a radial embedded type permanent magnet synchronous motor and a tangential embedded type permanent magnet synchronous motor) and an inserted type permanent magnet synchronous motor according to the position of a permanent magnet, wherein the surface-mounted type permanent magnet synchronous motor is small in rotation inertia, simple in structure, easy to optimize design and manufacture and most widely applied.
Compared with the traditional direct current motor and asynchronous motor, the rotor permanent magnet type synchronous motor has higher power density and efficiency. However, special reinforcement measures are usually required for the rotor to overcome the centrifugal force during high-speed operation, and the effectiveness and reliability of the permanent magnet installation and fixation are also very important, which directly determine the performance and safety and reliability of the motor. At present, the permanent magnet of the surface-mounted rotor permanent magnet synchronous motor mainly adopts mechanical fixing, bonding and a mechanical fixing and bonding combination method. The bonding strength is limited, and the aging problem of the adhesive (epoxy resin, anaerobic adhesive and the like) exists, so that the bonding is greatly restricted. Because the sintered Nd-Fe-B permanent magnet is a brittle material, the sintered Nd-Fe-B permanent magnet is easily damaged by mechanical fixation, and the connection fixation of the sintered Nd-Fe-B permanent magnet is also loosened due to thermal expansion in the high-speed running process of the magnet. In addition, the permanent magnet is demagnetized due to microscopic impact and vibration in a vibration environment, resulting in a decrease in magnetic properties and even a failure of the motor in severe cases. Therefore, the reliability and effectiveness of the permanent magnet in mounting and fixing on the rotor are improved, the requirement of the high-performance rotor permanent magnet synchronous motor for continuous development is met, the permanent magnet synchronous motor is a hot spot concerned by the manufacturing industry of the permanent magnet motors at home and abroad at present, and a common technical problem to be solved urgently is also needed.
Based on the existing research basis, the invention provides a brazing filler metal for mounting and fixing a permanent magnet on a rotor by adopting a vacuum brazing method, and discloses a brazing filler metal matched with brazing (a foil brazing filler metal for brazing sintered neodymium-iron-boron permanent magnet material and a preparation method thereof, wherein the brazing filler metal comprises, by mass, 7.0-8.0 parts of Nd, 19.0-20 parts of Al, 8.0-9.0 parts of Si, 4.0-5.0 parts of Zn, 1.0-2.0 parts of Ge, 3.0-4.0 parts of Ag, 0.5-0.6 parts of Ga, 0.35-0.45 parts of Bi, and the balance Cu., the brazing filler metal is prepared by adopting a melt rapid cooling technology, the melting point is lower than 580 ℃, the brazing filler metal for brazing the plated sintered neodymium-iron-boron magnet and the preparation method thereof, the brazing filler metal comprises, by mass, 10.0-12.0 parts of Al, 8.0-9.5 parts of Si, 4.5-5.0 parts of Zn, 3.0-4.0 parts of Ge, 5.0-4.0 parts of Ag, 0-0 parts of Ni, 0-40-0.5.5, 0 parts of La, 40-0 parts of Ce, the balance being Cu. The brazing filler metal is prepared by adopting a melt rapid cooling technology, and the melting point is lower than 532 ℃. The brazing is one of the most effective modes for connecting and fixing materials, and is a method for realizing connection by adopting a metal material with a melting point lower than that of a welding piece base metal as a brazing filler metal, heating the welding piece base metal and the brazing filler metal to a temperature higher than the melting point of the brazing filler metal but lower than the melting point of the welding piece base metal, wetting the welding piece base metal by using the liquid brazing filler metal, filling a welding joint gap and mutually diffusing the liquid brazing filler metal and the welding piece base metal. The brazing has the characteristics of low welding temperature and wide adaptability of the base metal of the weldment, so that the application is wide.
The permanent magnet is installed and fixed on the rotor by adopting a vacuum brazing method, and besides brazing filler metal and a brazing process, another key factor is the assembly of the permanent magnet on the rotor before brazing and the coordinated deformation of the permanent magnet and the rotor in the brazing process. The permanent magnet and the rotor matrix are subjected to the influence of a brazing temperature field during vacuum brazing, and are expanded during heating and contracted during cooling during brazing; the brazing filler metal is heated to a melting temperature to be melted during heating, and crystallized during cooling to form a brazing joint. Because the permanent magnet and the rotor matrix are different in material, shape and size, the generated expansion and contraction deformation processes are different, the expansion deformation must be coordinated in the heating stage so as to ensure the capillary effect during brazing, and the brazing filler metal can be well filled in brazing gaps only by melting the brazing filler metal (incomplete filling can cause local non-welding to cause insufficient brazing connection strength); the shrinkage deformation in the cooling stage must be kept in harmony to ensure that a good brazed joint is formed, and the local shrinkage deformation is not harmonious, so that the defects of local non-welding or cracks and the like of the brazed joint can be caused, and the requirements cannot be met.
The fixture is adopted to ensure the brazing quality of the permanent magnet and the rotor, and is a mature technical approach: the permanent magnet is accurately positioned and fixed on the rotor through the fixture, then the rotor is sent into a vacuum brazing furnace for brazing, and the fixture is removed after the brazing is finished and the rotor is taken out of the furnace and cooled to room temperature. The fixture not only needs to accurately position and fix the permanent magnet on the rotor, but also needs to provide corresponding pressure in the vacuum brazing process, so that the permanent magnet and the rotor matrix are deformed and coordinated, and the brazing requirement is met. Therefore, the reliable fixture is adopted to carry out rapid assembly and brazing of the permanent magnet-rotor matrix, which is a practical problem that must be solved in the brazing production of the permanent magnet-rotor matrix. In addition, besides the reliability of the clamp, the use convenience, the manufacturing cost and the service life of the clamp must be comprehensively considered, and on the premise of ensuring the brazing quality, the brazing production efficiency is improved and the production cost is reduced.
Disclosure of Invention
The invention aims to solve the problems of the permanent magnet-rotor vacuum brazing of a surface-mounted outer rotor permanent magnet synchronous motor, and provides a combined flexible fixture for brazing an outer rotor neodymium iron boron permanent magnet of a permanent magnet motor, so that the assembly of the permanent magnet before welding on a rotor is quickly and reliably realized, and the brazing quality is ensured. The clamp has the advantages of simple structure, convenience in use, strong reliability, low cost, long service life and good economical efficiency.
The purpose of the invention is realized as follows: the invention discloses a combined flexible fixture for brazing an outer rotor neodymium iron boron permanent magnet of a permanent magnet motor, which mainly comprises a bottom plate, a central rod, a central seat, an outer rotor positioning device and a neodymium iron boron permanent magnet positioning device, wherein the central seat is fixed at the center of the bottom plate through the central rod; the outer rotor positioning device comprises a positioning bolt plate fixed on the bottom plate, a positioning bolt and a positioning sliding plate located at the front end of the positioning bolt. The neodymium iron boron permanent magnet positioning device comprises a pressing guide rod, a spring pressing nut, a spring sliding plate, a groove-shaped spring pressing plate and an arched positioning plate, wherein one end of the pressing guide rod is fixed on a central seat, the spring pressing nut and the spring are sleeved on the pressing guide rod, the spring pressing nut is located between the central seat and the spring, and the groove-shaped spring pressing plate is sleeved on the outer side of the spring and is adjacent to the spring pressing nut. The spring sliding plate is positioned between the spring and the arched positioning plate, and the side face of the arc end of the arched positioning plate is provided with a clamping groove matched with the neodymium iron boron permanent magnet. The fixture is a combined detachable independent element structure, and can conveniently combine the components formed by the fixture according to the outer rotor to be brazed, thereby meeting the assembly and brazing requirements of the outer rotors with different sizes.
On the basis of theoretical analysis and brazing test on the structure and weldability of the outer rotor, the invention determines the positioning and compressing mode of the permanent magnet-outer rotor: the bow-shaped positioning plate is matched with the spring, the spring provides pressing force to accurately fix and position the permanent magnet during assembly, and flexible pressure is provided during vacuum brazing, so that the permanent magnet and the rotor matrix are favorably coordinated and deformed during brazing, and high-quality brazing is obtained.
Preferably, the number of the outer rotor positioning devices and the number of the neodymium iron boron permanent magnet positioning devices are 4, the 4 outer rotor positioning devices are symmetrically fixed on the periphery of the bottom plate, and the 4 neodymium iron boron permanent magnet positioning devices are 4 and symmetrically fixed on the side face of the center seat.
The use steps of the combined flexible fixture for the outer rotor neodymium iron boron permanent magnet brazing of the permanent magnet motor are as follows:
1) and (4) wiping the parts formed by the fixture, the rotor to be welded and the permanent magnet by using acetone for standby.
2) Four compression guide rods are respectively fixed on the central seat through threads at one end and are locked through nuts and washers.
3) The center base is fixed on the bottom plate through the center rod, the nut and the washer.
4) And (4) placing the clamp bottom plate assembled in the step (3) on a horizontal workbench.
5) The spring compression nut is screwed into the compression guide rod, and then the groove-shaped spring pressing plate and the spring are sleeved in the groove-shaped spring pressing plate.
6) Positioning a rotor: firstly, the rotor is placed on the bottom plate, then the positioning bolts are screwed in, the positioning slide plate is placed between the positioning bolts and the rotor, and the four positioning bolts are adjusted to position the rotor, so that the center of the rotor is enabled to coincide with the center of the bottom plate.
7) Positioning a permanent magnet: placing the arched positioning plate, inserting the permanent magnet into a clamping groove of the arched positioning plate (placing an R-5461-S mica tape with the thickness of 0.15mm between the permanent magnet and the arched positioning plate), adjusting the position of the arched positioning plate, placing the foil-shaped brazing filler metal between the permanent magnet and the rotor, and adjusting a spring compression nut to enable the spring to provide proper flexible pressure to position the permanent magnet so as to meet the drawing requirements.
6) And (4) feeding the assembled permanent magnet-rotor into a vacuum brazing furnace for brazing.
7) And after the brazing is finished, taking out the brazed permanent magnet rotor from the brazing furnace, cooling to room temperature, loosening the compression nut and the positioning bolt to obtain the brazed permanent magnet rotor, and sending the brazed permanent magnet rotor to the next process.
Has the advantages that: compared with the prior art, the invention adopts a flexible pressing method, ensures the accurate positioning of the permanent magnet on the rotor matrix and the deformation coordination of the permanent magnet and the rotor matrix in the vacuum brazing process, and obtains the high-quality brazed permanent magnet rotor. The fixture is a combined detachable independent element structure, can conveniently combine the components of the fixture according to the permanent magnet rotor to be brazed, and meets the assembly and brazing requirements of the similar permanent magnet rotors with different sizes. The clamp disclosed by the invention is simple in structure, convenient to use, strong in reliability, low in cost, long in service life and good in economical efficiency.
Drawings
FIG. 1 is a schematic view (front view) of a combined flexible fixture for outer rotor NdFeB permanent magnet brazing of a permanent magnet motor;
FIG. 2 is a schematic view (top view) of a combined flexible fixture for brazing an outer rotor, a neodymium iron boron permanent magnet of a permanent magnet motor;
FIG. 3 is a schematic view of the base plate (front view);
FIG. 4 is a schematic view of the base plate (top view);
FIG. 5 is a schematic view of a slotted spring platen;
FIG. 6 is a schematic view of an arcuate positioning plate (front view);
FIG. 7 is a schematic view of the arcuate positioning plate (top view)
In the figure: the device comprises a bottom plate 1, a positioning bolt 2, a positioning sliding plate 3, a central rod 4, a central seat 5, a pressing guide rod 6, a spring 7, a spring sliding plate 8, a groove-shaped spring pressing plate 9 and an arch positioning plate 10.
Detailed Description
As shown in fig. 1-7, a combined flexible fixture for brazing an outer rotor, an ndfeb permanent magnet of a permanent magnet motor mainly comprises a bottom plate 1, a central rod 4, a central seat 5, an outer rotor positioning device and an ndfeb permanent magnet positioning device, wherein the central seat 5 is fixed at the center of the bottom plate 1 through the central rod 4; the outer rotor positioning device comprises a positioning bolt plate fixed on the bottom plate 1, a positioning bolt 2 and a positioning sliding plate 3 positioned at the front end of the positioning bolt 2. The neodymium iron boron permanent magnet positioning device comprises a pressing guide rod 6, a spring 7, a spring sliding plate 8, a groove-shaped spring pressing plate 9 and an arched positioning plate 10, wherein one end of the pressing guide rod 6 is fixed on a central seat 5, the spring pressing nut and the spring 7 are sleeved on the pressing guide rod 6, the spring pressing nut is located between the central seat 5 and the spring 7, and the groove-shaped spring pressing plate 9 is sleeved on the outer side of the spring 7 and is adjacent to the spring pressing nut. The spring sliding plate 8 is located between the spring 7 and the arched positioning plate 10, and a clamping groove matched with the neodymium iron boron permanent magnet is formed in the side face of the arc end of the arched positioning plate 10.
The flexible clamp of the present invention will be described below with respect to its components, but the dimensions are not limited to those provided in the following examples.
The base plate of the invention provides a horizontal reference surface and a positioning point for assembling a permanent magnet-rotor matrix, is a 304 stainless steel machining welding part, as shown in figures 3 and 4, is made of a 304 stainless steel plate with the thickness of 30mm, the diameter of 500mm, a through hole with the diameter of 30.3mm is arranged in the center, and four positioning bolt plates (the distance from the inner side surface to the center of the base plate is 210mm) are welded on the upper surface at the positions of 0 DEG, 90 DEG, 180 DEG and 270 DEG and the diameter of 420mm by manual arc welding, and the size of the positioning bolt plates is (length multiplied by width multiplied by thickness): 40X 15mm, and a bolt hole M10X 1.25 is arranged in the center.
The positioning bolt is a 304 stainless steel M10 multiplied by 1.25 bolt, and the length of the bolt is 33mm (the length of a thread is 26 mm). The position of the rotor on the bottom plate is adjusted by symmetrically adjusting the four positioning bolts, so that the center of the rotor is ensured to coincide with the center of the bottom plate.
The positioning sliding plate is made of a 304 stainless steel plate with the thickness of 4mm, and the positioning sliding plate has the function of distributing the jacking force provided by the positioning bolt to the rotor without damaging the surface of the rotor. The width and height of the positioning slide plate are both 40 mm.
The center rod is made of 304 stainless steel, the outer diameter of the center rod is 30mm, and the length of the center rod is 80 mm. The two ends of the center rod are provided with M30 multiplied by 3.5 threads with the length of 25mm, and the center seat is fixed on the bottom plate through bolts and washers.
The center seat is made of 304 stainless steel, the size (length, width and height) is 60 x 40mm, a through hole with the diameter of 30.3mm is formed in the center of an upper plane (60 x 60mm) and a lower plane (60 x 60mm), an M16 x 2 bolt hole is formed in the center of each of four vertical planes (60 x 40mm), and the depth of a screw hole is 12 mm. The center seat is fixed on the bottom plate through a center rod, a nut and a washer, and provides a fulcrum for the spring to provide pressing force for the arched positioning plate through the pressing guide rod.
The compression guide rod is used for providing compression force for the spring to the bow-shaped positioning plate for guiding, is made of 304 stainless steel, has the outer diameter of 16mm, the length L1 of 70-90mm and the right end with the M16 multiplied by 2 right thread with the length of 20mm, is fixed on a central seat and is locked by a nut and a gasket; the left end is provided with M16 multiplied by 2 left threads with the length of L1-25mm, and the pressing force provided by the spring to the arched positioning plate is adjusted by adjusting the nut.
The spring of the invention provides the flexible pressure required by the bow-shaped positioning plate, and the magnitude of the flexible pressure is adjusted by adjusting the compression amount of the spring. The spring is made of GH132 heat-resistant steel with the diameter of 3mm, the inner diameter of the spring is 20mm, the length of the spring is L2 and is 45-67mm, and the rigidity of the spring is 15 or 20N/mm +/-5%. The service life of the spring is 100 times of brazing cycle, and the service life of other elements is more than 600 times of brazing cycle.
The spring sliding plate is made of a 304 stainless steel plate with the thickness of 4mm, and the function of the spring sliding plate is to evenly distribute the flexible pressure provided by the spring to the plane of the arched positioning plate. The length, width and height of the spring slide are all 40 mm.
The groove-shaped spring pressing plate is made of a 304 stainless steel plate with the thickness of 4mm, and the length, the width and the height of the groove-shaped spring pressing plate are all 30mm, as shown in figure 5. The function of the groove-shaped spring pressing plate is to ensure the effectiveness when the compression amount of the spring is adjusted by adjusting the compression nut.
The arch positioning plate of the invention is made of a 304 stainless steel plate and is a machined part with the height of 40mm, as shown in figures 6 and 7. The arc surface end of the arch positioning plate is provided with a groove, the width of the groove is +0.4mm of the width of the permanent magnet, and the depth (the depth of the arc surface) is 5 mm. The function of the arched positioning plate is to ensure the accurate positioning of the permanent magnet and the rotor and provide flexible pressure during brazing.
The following describes the combined flexible fixture for brazing the outer rotor neodymium iron boron permanent magnet of the permanent magnet motor in detail with reference to the specific embodiments.
Example 1
A certain type aviation permanent-magnet machine, the yoke of outer rotor is No. 10 steel, 360mm of internal diameter, wall thickness 20mm, height 45mm, 26N 33UH sintered permanent magnets of inner circumferential surface equipartition, and the permanent magnet size is: height 43mm, thickness 7.65mm, outer perimeter 30 mm.
The relevant parameters of the combined flexible clamp are as follows:
a base plate 1 made of a 304 stainless steel plate having a thickness of 30mm, a diameter of 500mm, a through hole having a diameter of 30.3mm formed in the center thereof, and four anchor bolt plates (the distance from the inner side surface to the center of the base plate is 210mm) welded by manual arc welding at 0 °, 90 °, 180 °, and 270 ° of the upper surface and at a diameter of 420mm, the anchor bolt plates having the dimensions (length × width × thickness): 40X 15mm, and a bolt hole M10X 1.25 is arranged in the center.
The four positioning bolts 2 are 304 stainless steel M10X 1.25 bolts, and the length of the bolts is 33mm (the length of the thread is 26 mm).
The four positioning sliding plates 3 are made of SU304 stainless steel plates with the thickness of 4mm, and the width and the height of each positioning sliding plate are 40 mm.
A center rod 4 is made of 304 stainless steel, has an outer diameter of 30mm and a length of 80mm, and is provided with M30 multiplied by 3.5 threads with a length of 25mm at both ends thereof.
A center base 5 is made of 304 stainless steel, and has dimensions (length x width x height) of 60 x 40mm, a through hole of 30.3mm is formed at the center of the upper and lower planes (60 x 60mm), and M16 x 2 bolt holes are formed at the centers of the four vertical planes (60 x 40mm), and the depth of the screw hole is 12 mm.
Four hold-down guide rods 6 are made of 304 stainless steel, the outer diameter is 16mm, the length is 90mm, the left end is provided with M16 multiplied by 2 left threads with the length of 65mm, and the right end is provided with M16 multiplied by 2 right threads with the length of 20 mm.
The four springs 7 are made of GH132 heat-resistant steel with the diameter of 3mm, the inner diameter is 20mm, the length is 67mm, and the rigidity is 10N/mm +/-5%.
The four spring slides 8 are made of a 304 stainless steel plate 4mm thick, 40mm wide and 40mm high.
The four groove-type spring pressing plates 9 are made of 304 stainless steel plates with the thickness of 4mm, and the length, the width and the height of the four groove-type spring pressing plates are all 30 mm.
The four arch positioning plates 10 are made of 304 stainless steel plates and are machined parts, and the height is 40 mm. 26 clamping grooves are all distributed on the circular side surface formed by the four bow-shaped positioning plates 10, the width of each clamping groove is +0.4mm (the outer circumference is 30.4mm), and the depth (the depth of the circular arc surface) is 5 mm.
The combined flexible clamp comprises the following use steps:
1) and (4) wiping the parts formed by the fixture, the rotor magnetic yoke to be welded and the permanent magnet by using acetone for standby.
2) Four compression guide rods 6 are respectively fixed on the central seat 5 through threads at one end and are locked through nuts and washers.
3) The central seat 5 is fixed to the bottom plate 1 by means of a central rod 4, a nut and a washer.
4) And (3) placing the clamp bottom plate 1 assembled in the step (3) on a horizontal workbench.
5) The spring compression nut is screwed into the compression guide rod 6 and then sleeved into the groove-shaped spring pressing plate 9 and the spring 7.
6) Positioning a rotor: firstly, a rotor is arranged on a bottom plate 1, then positioning bolts 2 are screwed in, a positioning sliding plate 3 is arranged between the positioning bolts 2 and the rotor, and the four positioning bolts 2 are adjusted to position the rotor, so that the center of the rotor is ensured to coincide with the center of the bottom plate.
7) Positioning a permanent magnet: placing the arched positioning plate 10, then inserting the permanent magnet into a clamping groove of the arched positioning plate 10 (placing an R-5461-S mica tape with the thickness of 0.15mm between the permanent magnet and the arched positioning plate 10), then adjusting the position of the arched positioning plate 10, placing a foil-shaped brazing filler metal between the permanent magnet and the rotor, and then positioning the permanent magnet by adjusting a spring compression nut, so as to meet the requirements of drawings.
The thickness of the foil-shaped brazing filler metal is 206 μm, and the components in percentage by mass are as follows: nd: 7.0, Al: 20.0, Si: 9.0, Zn: 4.0, Ge: 2.0, Ag: 4.0, Ga: 0.6, Bi: 0.45, and the balance of Cu.
8) And (3) sending the assembled permanent magnet-rotor magnetic yoke into a vacuum brazing furnace for brazing: the brazing chamber is vacuumized to 7 x 10-3Heating to 590 ℃ at the heating rate of 10 ℃/min when Pa, keeping the temperature for 15min, stopping heating, closing a vacuumizing system when a brazing chamber is cooled to 300 ℃, filling pure argon to forcibly cool the brazing chamber, namely opening an exhaust valve of the brazing chamber when the pure argon is filled to 0.05MPa, continuously filling the pure argon until the brazing chamber is cooled to 100 ℃, closing the exhaust valve of the brazing chamber when the pressure of the brazing chamber is consistent with the external atmospheric environment, opening a brazing furnace door, taking out a brazed permanent magnet rotor magnetic yoke, naturally cooling the brazed permanent magnet rotor magnetic yoke to the room temperature in the atmosphere, loosening a compression nut and a positioning bolt 2, and obtaining the brazed permanent magnet rotor magnetic yoke to be sent to the next process.
Example 2
High-speed permanent-magnet machine of certain type aviation, the yoke of outer rotor is number 10 steel, internal diameter 340mm, wall thickness 32mm, height 60mm, 16 blocks of N35EH sintered permanent magnets of inner circumferential surface equipartition, and the permanent magnet size is: height 58mm, thickness 15.7mm, outer perimeter 42 mm.
The relevant parameters of the combined flexible clamp are as follows:
the bottom plate 1, the positioning bolts 2, the positioning sliding plates 3, the central rod 4, the central seat 5, the spring sliding plates 8 and the groove-shaped spring pressing plates 9 are the same as those in embodiment 1.
The pressing guide rod 6 is made of 304 stainless steel, has the outer diameter of 16mm and the length of 70mm, and is provided with M16 multiplied by 2 left threads with the length of 45mm at the left end and M16 multiplied by 2 right threads with the length of 20mm at the right end.
The spring 7 is made of GH132 heat-resistant steel with the diameter of 3mm, the inner diameter is 20mm, the length is 45mm, and the rigidity is 20N/mm +/-5%.
The arch positioning plate 10 is made of a 304 stainless steel plate and is a machined part with the height of 40 mm. The 16 clamping grooves are all distributed on the circular side surface formed by the four bow-shaped positioning plates 10, the width of each clamping groove is +0.4mm (the outer circumference is 42.4mm), and the depth (the depth of the circular arc surface) is 5 mm.
The combined flexible clamp comprises the following use steps:
1) about 7) the same as in example 1.
The thickness of the foil-shaped brazing filler metal is 182 mu m, and the foil-shaped brazing filler metal comprises the following components in percentage by mass: nd: 7.5, Al: 19.5, Si: 8.5, Zn: 5.0, Ge: 1.5, Ag: 3.5, Ga: 0.6, Bi: 0.45, and the balance of Cu.
8) And (3) sending the assembled permanent magnet-rotor magnetic yoke into a vacuum brazing furnace for brazing: the brazing chamber is vacuumized to 7 x 10-3Heating to 600 ℃ at the heating rate of 8 ℃/min when Pa, keeping the temperature for 15min, stopping heating, closing a vacuumizing system when a brazing chamber is cooled to 300 ℃, filling pure argon to forcibly cool the brazing chamber, namely opening an exhaust valve of the brazing chamber when the pure argon is filled to 0.05MPa, continuously filling the pure argon until the brazing chamber is cooled to 100 ℃, closing the exhaust valve of the brazing chamber when the pressure of the brazing chamber is consistent with the external atmospheric environment, opening a brazing furnace door, taking out a brazed permanent magnet rotor magnetic yoke, naturally cooling the brazed permanent magnet rotor magnetic yoke to the room temperature in the atmosphere, loosening a compression nut and a positioning bolt 2, and obtaining the brazed permanent magnet rotor magnetic yoke to be sent to the next process.
The above-described embodiments are intended to illustrate rather than to limit the invention, and any modifications and variations of the present invention are within the spirit of the invention and the scope of the appended claims.
Claims (3)
1. The utility model provides a permanent-magnet machine outer rotor neodymium iron boron permanent magnet combination formula flexible fixture that brazes which characterized in that: the fixture mainly comprises a bottom plate (1), a central rod (4), a central seat (5), an outer rotor positioning device and a neodymium iron boron permanent magnet positioning device, wherein the central seat (5) is fixed at the center of the bottom plate (1) through the central rod (4); the outer rotor positioning device comprises a positioning bolt plate fixed on the bottom plate (1), a positioning bolt (2) and a positioning sliding plate (3) located at the front end of the positioning bolt (2). The neodymium iron boron permanent magnet positioning device comprises a pressing guide rod (6), a spring pressing nut, a spring (7), a spring sliding plate (8), a groove-shaped spring pressing plate (9) and an arched positioning plate (10), wherein one end of the pressing guide rod (6) is fixed on a center seat (5), the spring pressing nut and the spring (7) are sleeved on the pressing guide rod (6), the spring pressing nut is located between the center seat (5) and the spring (7), and the groove-shaped spring pressing plate (9) is sleeved on the outer side of the spring (7) and is adjacent to the spring pressing nut. The spring sliding plate (8) is positioned between the spring (7) and the arched positioning plate (10), and the side face of the arc end of the arched positioning plate (10) is provided with a clamping groove matched with the neodymium iron boron permanent magnet.
2. The combined flexible clamp for brazing the outer rotor, neodymium iron boron permanent magnet of the permanent magnet motor according to claim 1, is characterized in that: the outer rotor positioning devices and the neodymium iron boron permanent magnet positioning devices are 4, the 4 outer rotor positioning devices are symmetrically fixed on the periphery of the bottom plate (1), and the 4 neodymium iron boron permanent magnet positioning devices are 4 symmetrically fixed on the side face of the center seat (5).
3. The combined flexible clamp for brazing the outer rotor, neodymium iron boron permanent magnet of the permanent magnet motor according to claim 1, is characterized in that: the central rod (4) penetrates through the through holes of the central seat (5) and the bottom plate (1), and the central seat (5) is fixed at the center of the bottom plate (1) at two ends of the central rod (4) through screwing nuts.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010051445.8A CN111112785B (en) | 2020-01-17 | 2020-01-17 | Combined flexible fixture for brazing of outer rotor neodymium-iron-boron permanent magnet of permanent magnet motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010051445.8A CN111112785B (en) | 2020-01-17 | 2020-01-17 | Combined flexible fixture for brazing of outer rotor neodymium-iron-boron permanent magnet of permanent magnet motor |
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| Publication Number | Publication Date |
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| CN111112785A true CN111112785A (en) | 2020-05-08 |
| CN111112785B CN111112785B (en) | 2021-02-12 |
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| CN202010051445.8A Active CN111112785B (en) | 2020-01-17 | 2020-01-17 | Combined flexible fixture for brazing of outer rotor neodymium-iron-boron permanent magnet of permanent magnet motor |
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Cited By (1)
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| CN113500267A (en) * | 2021-07-15 | 2021-10-15 | 西安远航真空钎焊技术有限公司 | Vacuum brazing clamp system of honeycomb corrugated plate heat exchange structure |
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