CN111478474B - Motor rotor for radial cylinder type permanent magnet synchronous motor and preparation method thereof - Google Patents
Motor rotor for radial cylinder type permanent magnet synchronous motor and preparation method thereof Download PDFInfo
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- CN111478474B CN111478474B CN202010486517.1A CN202010486517A CN111478474B CN 111478474 B CN111478474 B CN 111478474B CN 202010486517 A CN202010486517 A CN 202010486517A CN 111478474 B CN111478474 B CN 111478474B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
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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
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- 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
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Abstract
The invention relates to a motor rotor for a radial cylinder type permanent magnet synchronous motor, which comprises a rotating shaft and a plurality of sections of rotor cores arranged on the rotating shaft, wherein the plurality of sections of rotor cores are respectively arranged along a rotor positioning groove in an inclined polar angle, and each section of rotor core is formed by rolling an amorphous or nanocrystalline thin strip. Meanwhile, the invention provides a technology for performing paint dipping, winding, curing, integral cutting and formed amorphous block stator and rotor cutting on the formed amorphous/nanocrystalline thin strip thick coil by adopting the polygonal roller, and replaces the traditional processing method of the cylinder type amorphous motor rotor iron core, wherein the cylinder type amorphous motor rotor iron core is formed by laminating the amorphous thin strip, curing the paint dipping and then cutting the amorphous thin strip, so that the production cost of the cylinder type rotor iron core is greatly reduced, the production efficiency is improved, and the motor performance is improved.
Description
Technical Field
The invention relates to the technical field of motor rotors, in particular to a motor rotor for a radial cylinder type permanent magnet synchronous motor and a preparation method thereof.
Background
In the prior art, in the design of a permanent magnet synchronous motor for a vehicle, an excitation iron core is often formed by laminating traditional silicon steel sheet materials, and the weight of the excitation iron core accounts for more than 80% of the weight of the whole motor. The iron core is used for excitation in the motor and is made of soft magnetic material capable of being magnetized repeatedly. The standard for measuring the soft magnetic property of the iron core material needs to pay attention to the coercive force in a magnetic hysteresis loop, the area of the magnetic hysteresis loop and the saturation magnetic density value. The amorphous/nanocrystalline material has a smaller area of a hysteresis loop, lower coercive force Hc and smaller loss.
The amorphous material has no crystal boundary structure on the millimeter scale because the atomic arrangement is irregular, so that a magnetic domain wall cannot be pinned by the crystal boundary, and the hysteresis loss of the amorphous/nanocrystalline material is lower than that of the silicon steel material. For thin-plate magnetic material, the eddy current loss and the material conductivity
Inversely proportional to the thickness of the materialdPeak value of magnetic fieldB m And frequency of currentfIs proportional to the square of (d). The amorphous/nanocrystalline material has higher conductivity than the silicon steel material, and the ultra-thin strip prepared by the ultra-cold method is only 2-4 mu m, which is one tenth of the thickness of the silicon steel sheet, so the amorphous/nanocrystalline material has better high-frequency eddy current loss characteristic. In addition, compared with the traditional silicon steel material, the amorphous/nanocrystalline material has better mechanical property and excellent corrosion resistance. The yield strength of the traditional silicon steel is only 300-400MPa, so that the design of a rotor topological structure is greatly limited. Compared with silicon steel materials, amorphous/nanocrystalline materials have higher tensile yield strength, and the yield strength of the amorphous/nanocrystalline materials is generally in the order of gigapascals, so that the amorphous/nanocrystalline materials can bear larger centrifugal force when a motor rotates at high speed, and the ultimate design of the motor is facilitated.
The amorphous soft magnetic material mostly adopts super-cooled molten metal to drop on a rotating roller, and the cooling rate of the molten metal is controlled to 10 6 K/s grade to produce solid amorphous ribbons, which is industrially very cold. The amorphous thin strip manufactured by the ultra-cold method is extremely thin and has the thickness of only 1/10 of the thickness of the traditional silicon steel material, so that if the iron core is manufactured by the traditional laminating process, the cost is 10 times of that of the silicon steel material, and great resource waste is caused.
Earlier patent publications US4155397\ US4363988\ US4578610 and the like all adopt a production method for producing amorphous iron cores of silicon steel sheet motor iron cores, which not only wastes manpower and material resources in a large quantity, but also produces greater damage to a sheet punching die due to the high strength of amorphous materials, greatly reduces the service life of the die and causes great cost waste.
Then, for the core manufacturing technology of the radial amorphous motor, due to cost consideration, the maximum width of the amorphous strip is limited, and a plurality of motor cores with larger outer diameters mostly adopt a block structure, such as a block structure
CN101800456A/CN103872857A/US7067950B 2. Because the motor iron core is manufactured in the C-shaped split block mode, the integral cylinder type stator iron core is split into the smaller unit modules, the robustness of the integral system can be greatly reduced, large allowance is reserved for selecting air gaps, and the power density of the whole machine is greatly reduced. Meanwhile, the block amorphous iron core can generate larger internal stress in the adjacent unit iron cores due to the special physical structure of the block amorphous iron core, and the electromagnetic performance of the amorphous iron core can be further deteriorated by the processing method because the amorphous/nanocrystalline material is sensitive to the residual stress.
In summary, the stator processing technology of the amorphous motor is a technical problem to be solved urgently, if the traditional punching, shearing and laminating mode is adopted, a large amount of working hours are wasted due to the laminating technology, meanwhile, the loss of a single punching die is aggravated due to the higher hardness and strength of the amorphous material, and the die cost is increased.
Disclosure of Invention
The invention aims to provide an improved motor rotor for a radial cylinder type permanent magnet synchronous motor and a preparation method thereof.
In order to achieve the purpose, the technical scheme of the invention is as follows: a electric motor rotor for radial cylinder PMSM which characterized in that: the motor rotor comprises a rotating shaft and a plurality of sections of rotor iron core blocks arranged on the rotating shaft, wherein the plurality of sections of rotor iron core blocks are arranged along a rotor positioning groove respectively at an oblique polar angle, and each section of rotor iron core block is formed by rolling an amorphous or nanocrystalline thin strip.
Preferably, the number of the multi-section rotor iron cores is 2, preferably 4 and 6, and the slant angle of the four-section rotor iron core blocks, which is inclined with respect to the rotor positioning grooves, is 0 degree, 2.75 degrees and 0 degree; the oblique polar angle that six sections rotor core inclined than rotor positioning groove in proper order is 0 °, 1.4 °, 2.8 °, 1.4 ° and 0 °.
A preparation method of a motor rotor for a radial cylinder type permanent magnet synchronous motor is characterized by comprising the following steps: a. sequentially laminating and winding the amorphous or nanocrystalline thin strip on a polygonal roller after paint dipping and heating; b. the strip wound on the polygonal roller is solidified to form a closed annular plate body; c. ejecting the annular plate body from the polygonal roller, cutting, and cutting off arc corner parts to form a plurality of cuboid iron core blocks; d. and performing cold cutting on the iron core block to form a rotor iron core block, then performing annealing treatment, and finally performing segmented oblique-pole stacking on the rotor iron core block to form the motor rotor.
Further, in the step a, a paint dipping groove and a heating pipe are arranged, a first movable pulley and immersion liquid are arranged in the paint dipping groove, the first movable pulley is immersed by the immersion liquid, the heating pipe is of a hollow structure, a first fixed pulley and a second fixed pulley are arranged above the heating pipe, the amorphous or nanocrystalline strip sequentially winds around the first movable pulley, penetrates through the heating pipe, winds around the first fixed pulley and the second fixed pulley and then is wound on a polygonal roller, and then the strip rotates along with the polygonal roller to be sequentially overlapped and wound on the roller; and a paint scraping step is also arranged in the paint dipping and heating steps, a paint scraper is arranged between the heating pipe and the paint dipping groove, and the position of the paint scraper corresponds to the position of the moving strip.
Compared with the prior art, the technical scheme of the invention comprises the improvement of a plurality of details besides the improvement of the whole technical scheme, and particularly has the following beneficial effects:
1. according to the improved scheme, the plurality of sections of rotor iron core blocks are respectively arranged along the rotor positioning grooves in a manner of inclining an oblique polar angle, each section of rotor iron core block is formed by rolling amorphous or nanocrystalline thin strips, and the rolled rotor iron core blocks reduce the processing cost and the manufacturing time, improve the efficiency and reduce the cost to 1/4-1/5 of the original cost;
2. according to the preparation scheme, the amorphous/nanocrystalline thin strip thick coil is used for paint dipping, winding, curing and integral cutting, and then the stator and rotor iron core blocks are formed, so that the traditional lamination process is replaced, the loss is reduced, the excessively long working time of the traditional lamination process is greatly reduced, and the cost is reduced; meanwhile, the stacking direction is the motor eddy current direction, so that eddy current generated by a motor magnetic field is just blocked, and eddy current loss is better reduced;
3. according to the preparation scheme, a single-punch die used in a lamination process is not needed any more, so that the production cost is reduced, the precision and the quality of a finished rotor iron core block are higher, the power of the whole machine is improved, and the robustness and the structural stability of the whole machine are better;
4. the preparation method has the advantages of simple process, reasonable step arrangement, good commercial value and convenient popularization and utilization.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic view of the dispersion of fig. 1.
Fig. 3 is a schematic structural view of the rotor core block according to the present invention.
Fig. 4 is a flow chart of a manufacturing process of the rotor core block of the present invention.
Fig. 5 is a schematic diagram of the structure of the belt material of the present invention cured on a roller to form an annular plate.
FIG. 6 is a schematic view of the structure of the cut arc portion of the circular plate material of the present invention.
Fig. 7 is a schematic structural view of the ring-shaped plate material of the present invention cut into core blocks.
Fig. 8 is a schematic view showing a structure in which the core block is cut into the rotor core block according to the present invention.
FIG. 9 is a schematic view of another embodiment of the present invention showing the strip material solidified on the rollers to form an annular plate.
FIG. 10 is a schematic view of the cut arc portion of the annular sheet of material of FIG. 9.
Fig. 11 is a schematic view of the structure of the square roller of the present invention.
Reference numerals are as follows:
the device comprises an amorphous or nanocrystalline thin strip 1, a paint dipping tank 2, a paint scraper 3, a heating furnace 4, an annular plate 5, a polygonal roller 6, a first movable pulley 7, a second movable pulley 8, a first fixed pulley 9, a second fixed pulley 10, an arc part 11, a core block 12, a rotor core block 13 and a rotating shaft 14;
61 rotating shaft, 62 clamping plate and 63 weight removing hole;
131 through holes, 132 fix the connecting pieces.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a motor rotor for a radial cylinder type permanent magnet synchronous motor, and particularly relates to a motor rotor shown in figure 1.
Specifically, the multi-section rotor iron core is a multiple of 2, preferably 4 and 6, and the four-section rotor iron core blocks are sequentially inclined by the oblique polar angles of 0 degree, 2.75 degrees and 0 degree compared with the rotor positioning grooves; the oblique polar angle of the six sections of rotor iron cores which are inclined to the rotor positioning groove sequentially is 0 degree, 1.4 degrees, 2.8 degrees, 1.4 degrees and 0 degree; every adjacent section rotor core piece is connected through the mounting, is equipped with the through-hole that is used for connecting the mounting on the rotor core piece, specifically, is equipped with the through-hole 131 that a plurality of set up along same circumference on every rotor core, is equipped with cylindric connection mounting 132 on every through-hole.
The invention also provides a preparation method of the motor rotor for the radial cylinder type permanent magnet synchronous motor, which is characterized by comprising the following steps: a. sequentially laminating and winding the amorphous or nanocrystalline thin strip on a polygonal roller after paint dipping and heating; b. the strip wound on the polygonal roller is solidified to form a closed annular plate body; c. ejecting the annular plate body from the polygonal roller, cutting, and cutting off arc corner parts to form a plurality of cuboid iron core blocks; d. and performing cold cutting on the iron core blocks to form rotor iron core blocks, then performing annealing treatment, and finally performing segmented oblique-pole stacking on the rotor iron core blocks to form the motor rotor.
The amorphous or nanocrystalline thin strip is adopted in the invention because the hysteresis loop of the material has a smaller area and the coercive force Hc is lower, which directly leads to smaller hysteresis loss of the soft magnetic material. In the amorphous soft magnetic material, the alternating current loss of the amorphous soft magnetic material is limited to increase along with the rising of the electric excitation frequency, and the alternating current loss is smaller than that of the silicon steel material. Meanwhile, the amorphous material has no crystal grain/crystal boundary structure inside; the nanocrystalline material has only a very small grain/grain boundary structure, so that the abnormal loss of the nanocrystalline material is obviously reduced compared with the silicon steel material with complicated internal grains. According to a material data simulation result, the loss of a motor with 6w turns is 10 times different when an amorphous material and a silicon steel material are adopted for excitation, and under the condition that restriction factors such as processing factors and stress residue are considered, the total iron loss of the motor is 1/5-1/6 of that of a silicon steel excitation iron core according to a prototype result.
Example 1
In the design of the motor, in order to control the vibration noise performance of the motor, the motor rotor is generally required to be subjected to segmented oblique pole stacking, the whole rotor generates bending moment along an axial V-shaped oblique pole instead of a rotating shaft, the cogging torque of a whole machine system is reduced, and the vibration noise performance of the whole motor is further weakened.
Further, each section can be split into integral multiple sections of 2, preferably into 4, 6 or 8 sections, because the rotor is split into n sections along the axial whole length, and the thickness of each section ranges from 25 mm to 80mm, and the preferred thickness is 50 mm to 53 mm.
Specifically, the whole motor rotor core is formed by stacking four sections of rotor core blocks, the four sections of the rotor core blocks respectively correspond to four sides of an amorphous thick roll rolled by a selected quadrilateral roller, each section of the built-in rotor core block is respectively inclined by a specific angle compared with a rotor positioning groove, and the inclination angle of a rotor slotting relative to the positioning hole is 2.75 degrees in the embodiment, so that the four sections of the oblique pole angles are 0 degree, 2.75 degrees and 0 degree. In the rotor oblique pole technology, the design of a symmetrical section can be adopted to offset the flexural deformation generated by a rotor shaft.
Wherein each rotor core block is mechanically connected to reduce the influence of bonding stress, the fixing structure is made of a stainless steel material with the diameter of 3mm, and each rotor core block is inserted into the fixing structure through a cut through hole.
The amorphous iron core produced by the process is the same as the amorphous iron core laminated by the traditional method in the iron core laminating direction, and aims to replace the laminating process by the winding process, thereby greatly reducing the excessively long working time of the traditional laminating process and reducing the cost and the related resource loss. The stacking direction is the motor eddy current direction, so that eddy current generated by a motor magnetic field is just blocked, and eddy current loss is better reduced. Specifically, the cross-sectional magnetic flux direction of the motor rotates along a single-layer amorphous material through an air gap, and the eddy current generated by the faraday electromagnetic induction phenomenon is perpendicular to the magnetic flux direction. And the eddy current in the direction perpendicular to the magnetic flux is just divided by each layer of amorphous sheet on the transmission path, so that the path corresponding to the eddy current propagation is greatly reduced. According to the eddy current resistance R = rho l/s, the cross section area of the single-layer amorphous stator thin strip is not changed, so that the integral eddy current resistance can be greatly reduced and the eddy current loss can be reduced by equally dividing the integral I, namely the core thickness into extremely small (0.02-0.04 mm).
In conclusion, the invention changes the iron core manufacturing technology of the radial cylinder type amorphous motor, replaces the traditional laminating process by cutting the iron core blocks after winding and forming, greatly reduces the production cost of the cylinder type amorphous iron core, and has strong industrial popularization value.
Example 2
This embodiment radial cylinder high rotational speed PMSM, stator core external diameter is 180mm, and regular hexagon structure is selected to the polygon roller, and the chamfer radius is 10mm. The preparation method of the motor rotor comprises the following steps: a. sequentially laminating and winding the amorphous or nanocrystalline thin strip on a polygonal roller after paint dipping and heating; b. the strip wound on the regular hexagonal roller is solidified to form a closed annular plate body; c. ejecting the annular plate body out of the regular hexagon roller, cutting, and cutting off arc corner parts to form six cuboid iron core blocks; d. and performing cold cutting on the iron core blocks to form rotor iron core blocks, then performing annealing treatment, and finally performing segmented oblique-pole stacking on the rotor iron core blocks to form the motor rotor.
In the step a, a paint dipping groove and a heating pipe are arranged, a first movable pulley and immersion liquid are arranged in the paint dipping groove, the first movable pulley is immersed by the immersion liquid, the heating pipe is of a hollow structure (the heating pipe can be used for a strip to pass through and heat two sides of the strip), a first fixed pulley and a second fixed pulley are arranged above the heating pipe, an amorphous or nanocrystalline strip sequentially winds on a polygonal roller after passing through the first movable pulley, the heating pipe and the first fixed pulley and the second fixed pulley, and then the strip is sequentially overlapped and wound on the roller along with the rotation of the polygonal roller; and a paint scraping step is also arranged in the paint dipping and heating steps, a paint scraper is arranged between the heating pipe and the paint dipping groove, and the position of the paint scraper corresponds to the position of the moving strip.
The paint scraper is a group of paint scraping plates symmetrically arranged along two sides of the strip material, the distance between the two paint scraping plates is +/-1-6 mu m, and the preferable distance is +/-1-3 mu m, so that the thickness of the immersion liquid remained on the surface of the strip material is 1-3 mu m; the heating temperature range of the heating pipe is 50-320 ℃, the paint scraping plates are in an isosceles triangle structure, the bottom plate is larger than the width of the strip, and the distance between the two paint scraping plates can be adjusted.
And b, applying pressure of 1-20MPa to the surface normal direction of the amorphous block wound by the regular hexagon roller, wherein the optimal pressure value is 10-12MPa, so that the immersion liquid dipped in the amorphous roll is formed by pressurization and solidification, and the magnitude of the applied pressure can be selected according to the lamination coefficient of 0.85-0.98. This compression technique allows a greater lamination factor to be achieved, but the system is more complex. Meanwhile, due to the strong magnetostriction characteristic of the amorphous material, the electromagnetic characteristic and the vibration characteristic of the amorphous material are limited by an excessively high lamination coefficient, and the preferable lamination coefficient is 0.88-0.93.
And ejecting the formed annular plate body through bolts at two end faces of the roller, and cutting the formed regular hexagon amorphous/nanocrystalline thick roll, wherein the selected cutting mode is a cold cutting mode but not limited to the cold cutting mode, so that the melting phenomenon among amorphous thin belt layers is reduced as much as possible, and the preferred cutting modes comprise chemical corrosion cutting, laser cutting, water cutting and jet flow water abrasive cutting. During cutting, the annular plate body is cut into iron core blocks as large as possible in a cold cutting mode, and a cutting point is the joint of a straight line of the inner side wall and the curved surface from the inner side wall of the annular plate body. The cut amorphous thick plate needs to be subjected to a further cutting process to be processed into a stator and rotor core block, and because of the complexity of the motor stator and rotor topological structure, the cutting process is mainly concerned with the tolerance caused by the selected cutting mode, and the preferred cutting modes are slow wire cutting and jet flow water abrasive cutting. The technical route that can be selected when cutting is to add the apron at amorphous thick plate both ends, the apron is connected with affiliated amorphous thick plate through mechanical connection, and the apron material selects magnetic isolation material, and preferred is austenite steel material, but not limited to austenite steel material, still includes alloys such as iron, aluminium, copper. The formed rotor core block is subjected to integral stress relief annealing to release internal stress generated by the machining process.
It should be noted that the finished amorphous/nanocrystalline thin strip is an existing material, and is a finished material sold by various manufacturers, including iron-based, iron-nickel-based, and cobalt-based amorphous/nanocrystalline materials, the main components of which are Fe and Si, and different types of which include various elements such as nickel, cobalt, boron, phosphorus, carbon, and the like.
In the implementation, the motor rotor comprises a rotating shaft and six rotor iron core blocks arranged on the rotating shaft, the six rotor iron core blocks are respectively arranged along a rotor positioning groove in an inclined polar angle, and each rotor iron core block is formed by rolling an amorphous or nanocrystalline thin strip. Specifically, the inclination angle of the six sections of rotor cores is 0 degree, 1.4 degrees, 2.8 degrees, 1.4 degrees and 0 degree compared with the inclination angle of the rotor positioning groove in sequence.
Example 3
The invention provides a technology for performing paint dipping, winding, curing, integral cutting and formed amorphous block stator and rotor cutting on a formed amorphous/nanocrystalline thin strip thick coil by adopting a polygonal roller, and the processing method of the cylindrical amorphous motor excitation iron core replaces the traditional processing method of laminating an amorphous thin strip, performing paint dipping and curing and then performing cutting.
Specifically, an amorphous/nanocrystalline thin-film coil is adopted to form a solidified annular plate body through the process flow of paint dipping → paint scraping → heating → integral solidification in sequence, then the annular plate body is integrally cut to form a multi-section iron core block of the motor stator and rotor iron core, and the different sections of the integral stator and rotor iron core are mechanically connected and connected with each other. The formed iron core is subjected to integral stress relief annealing to release internal stress generated by the machining process.
In this embodiment, the roller is of a regular quadrilateral structure, the width of the amorphous thin strip is 200mm, the chamfer radius is 7.5mm, and the cutting process of the whole amorphous thick plate is jet water abrasive cutting. The amorphous thin belt is wound by adopting the noncircular polygonal roller, the curvature of the amorphous material wound on each layer of the amorphous thin belt is gradually increased, so that the thickness of the polygonal amorphous thick roll to be wound needs to be optimized in the process, and the thickness is selected within the range of 15-105mm according to the difference of the number of edges of the section of the polygonal roller. Since it is considered that the amorphous high-speed motor employs 4-stage oblique-pole arranged rotor core blocks, the thickness of the formed annular plate body is selected to be 52mm.
As shown in fig. 11, the roller comprises a rotating shaft, a regular quadrilateral roller body is arranged on the rotating shaft, clamping plates are respectively arranged at two ends of the roller body, a plurality of holes which are two by two and are symmetrically arranged along the center point of each clamping plate are arranged on each clamping plate, and the holes are weight-removing holes.
The dip coating is finished in the dip coating tank, and the liquid contained in the dip coating tank can be in a molar volume ratio of 1:6 epoxy resin and acetone curing agent; phenolic resin glue, temperature-resistant epoxy glue, silicon glue, polyimide glue and the like can also be used; meanwhile, the adhesive may be an inorganic adhesive including TW series, SL series, ZS series, or the like.
And after passing through the heating drying tube, the strip is wound through a polygonal roller to be integrally cured and molded. The whole solidification forming can control the polygon roller pair through the tension meter to the pulling force that the strip kinking effect produced, through the effect that reduces the rotational speed of polygon roller in order to reach promotion output torque, and then guarantee whole amorphous iron core's after kinking solidification forming fold the coefficient. Specifically, the tension generated by the winding of the strip material by the rotating speed of a polygonal roller is monitored by a tension meter, the tension meter is arranged between the roller and the strip material, and the tension of the roller on the strip material is controlled to be between 50 and 400N. According to the requirement of the lamination coefficient of the amorphous iron core block after cutting and forming, the matched polygonal roller rotating speed is selected, the lamination coefficient of the iron core block after cutting is selected to be within the range of 0.85-0.95, preferably 0.91 or 0.93, the controlled polygonal roller rotating speed is 50-500 r/min, preferably 250 r/min or 120 r/min, and meanwhile, a higher temperature field is applied in the winding process, and the selection range of the temperature field is 200-350 ℃.
And then, cutting the annular plate body into iron core blocks as large as possible in a cold cutting mode, wherein the cutting point is the joint of the straight line of the inner side wall and the curved surface from the inner side wall of the annular plate body. The reason why the inner surface is selected is that when the amorphous ribbon is formed into a square coil by winding, the chamfer or curvature of the intersection of the sides of the cross section is increased, and if the straight portion of the outer ring is selected to be cut inward perpendicular to the material surface, there is a high possibility that interference with the chamfer having a curvature of the inner ring surface other than 0 occurs, that is, the inner ring is not a flat portion. It is defined here that the cold cutting from the inner ring towards the outer ring enables the obtaining of flat iron core blocks of maximum size.
In the annealing process, the amorphous/nanocrystalline thin strip sheets are integrally cured by adhesive glue/insulating paint and the like, so that the cut amorphous stator and rotor blocks can be connected with the motor spindle only by a stress-relief integral annealing process. The integral stress relief annealing process needs to carry out heat treatment on the processed amorphous/nanocrystalline stator and rotor lamination blocks, so that stress residue caused by the processing process is released as much as possible in the process, and the integral electromagnetic performance of the amorphous iron core block is further improved. The annealing process is preferably performed by selecting a protective gas to protect the entire annealing atmosphere, and the selected protective gas may be, but is not limited to, hydrogen, nitrogen, an inert gas, argon, and the like. In the annealing process, a magnetic field along the radial direction of the motor can be applied to the iron core lamination block, so that a 180-degree domain wall with better magnetic conductivity can be formed. The overall annealing process of the core block should control factors such as annealing temperature, heating rate, annealing time, magnetic field size and the like, and the change of the factors can influence the magnetic characteristics of the annealed amorphous/nanocrystalline core block. Wherein the selection range of the heating rate is 1 to 30 ℃/min, and the preferred heating rate is 12 ℃/min; the annealing temperature is selected from the range of 110 ℃ to 580 ℃, preferably 350 ℃, 378 ℃ and 390 ℃; the annealing time is selected within the range of 0.5-4.5 hours, and the preferred annealing time is 90min and 150min; the range of the applied magnetic field is 0-0.5T, the preferred values are 0T, 0.05T and 0.2T, and the direction of the magnetic field is along the radial direction of the iron core; the annealing process of the magnetic field comprises the steps of firstly, preferably selecting argon as protective gas, placing the iron core in an atmosphere of 300-350 ℃, keeping the temperature for 15-30min, then, adding a magnetic field of 0.05-0.5T along the radial direction of the iron core, simultaneously, raising the atmosphere temperature to 350-400 ℃ at the speed of 1-15 ℃/min, keeping the temperature for 15-120min, then removing the external direct current magnetic field, standing the iron core, reducing the temperature to the room temperature at the same cooling speed, and removing the protective gas atmosphere.
In the implementation, the amorphous thick plate is not too thick for winding, in the design of a motor, in order to control the vibration noise performance of the motor, the motor rotor is generally required to be assembled in a segmented oblique pole stacking mode, the whole rotor generates bending moment along an axial V-shaped oblique pole instead of a rotating shaft, the tooth space torque of a whole machine system is reduced, and the vibration noise performance of the whole machine of the motor is weakened.
The above description is further intended to illustrate the present invention in detail with reference to specific preferred embodiments thereof, and it is not intended to limit the practice of the present invention to the above description. For those skilled in the art to which the invention pertains, numerous simple deductions or substitutions may be made without departing from the spirit of the invention, which shall be deemed to belong to the scope of the invention.
Claims (6)
1. A preparation method of a motor rotor for a radial cylinder type permanent magnet synchronous motor is characterized by comprising the following steps: the motor rotor comprises a rotating shaft and a plurality of sections of rotor cores arranged on the rotating shaft, wherein the plurality of sections of rotor cores are respectively arranged along a rotor positioning groove in an inclined polar angle; each section of rotor core is made by rolling an amorphous or nanocrystalline thin strip on a polygonal roller to form a closed annular plate body and then cutting the plate body, and the preparation method comprises the following steps: a. sequentially laminating and winding the amorphous or nanocrystalline thin strip on a regular hexagonal roller after paint dipping and heating; b. the strip wound on the regular hexagon roller is solidified to form a closed regular hexagon annular plate body, and the chamfer radius of the regular hexagon roller is 10mm; c. cutting the annular plate body after ejecting the annular plate body from the polygonal roller, wherein the arc corner parts are cut from the inner side wall of the annular plate body at the cutting point which is the joint of the straight line of the inner side wall and the curved surface to form a plurality of cuboid iron core blocks; d. performing cold cutting on the iron core block to form a rotor iron core block, then performing annealing treatment, and finally performing segmented oblique-pole stacking on the rotor iron core block to form a motor rotor; the multiple sections of rotor cores are multiples of 2, adjacent rotor cores are connected through a fixing piece, and through holes for connecting the fixing piece are formed in the rotor cores; each rotor core block is connected through a fixing structure, the fixing structure is made of a stainless steel material with the diameter of 3mm, and the fixing structure is inserted into each rotor core block through a cut through hole; when the number of the multi-section rotor iron cores is 4, the four-section rotor iron cores are inclined to the rotor positioning groove by the included angle of 0 degree, 2.75 degrees and 0 degree in sequence; when the number of the multi-section rotor iron cores is 6, the inclination angle of the six-section rotor iron cores which are inclined to the rotor positioning groove is 0 degree, 1.4 degrees, 2.8 degrees, 1.4 degrees and 0 degree.
2. The method for manufacturing a motor rotor for a radial drum type permanent magnet synchronous motor according to claim 1, wherein: in the step a, a paint dipping groove and a heating pipe are arranged, a first movable pulley and immersion liquid are arranged in the paint dipping groove, the first movable pulley is immersed by the immersion liquid, the heating pipe is of a hollow structure, a first fixed pulley and a second fixed pulley are arranged above the heating pipe, an amorphous or nanocrystalline strip material sequentially rounds the first movable pulley, penetrates through the heating pipe, rounds the first fixed pulley and the second fixed pulley and then is wound on a polygonal roller, and then the strip material is sequentially overlapped and wound on the roller along with the rotation of the polygonal roller; and a paint scraping step is also arranged in the paint dipping and heating steps, a paint scraper is arranged between the heating pipe and the paint dipping groove, and the position of the paint scraper corresponds to the position of the moving strip.
3. The method for manufacturing a motor rotor for a radial drum type permanent magnet synchronous motor according to claim 2, wherein: the paint scraper is a group of paint scraping plates symmetrically arranged along two sides of the strip material, and the distance between the two paint scraping plates is +/-1-6 mu m, so that the thickness of immersion liquid remained on the surface of the strip material is 1-6 mu m; the heating temperature range of the heating pipe is 50-320 ℃.
4. The method for manufacturing a motor rotor for a radial drum type permanent magnet synchronous motor according to claim 1, wherein: in the step b, the tension generated by winding the strip material at the rotating speed of the polygonal roller is monitored by a tension meter, the tension meter is arranged between the roller and the strip material, the tension of the strip material by the roller is controlled to be 50-400N, so that the strip material is cured, the rotating speed of the polygonal roller is 50-500 rpm, the selection range of the lamination coefficient of the iron core block is 0.85-0.98, and the temperature range of a temperature field during curing is 120-400 ℃.
5. The method for manufacturing a motor rotor for a radial drum type permanent magnet synchronous motor according to claim 1, wherein: in the step b, pressure is applied along the surface normal method of the annular plate body wound on the polygonal roller to solidify the strip, the pressure is 1-20Wpa, the strip attached with the immersion liquid is shaped through pressurization and solidification, the lamination coefficient is 0.85-0.98, and the temperature range of a temperature field when the pressure is applied is 120-400 ℃.
6. The method for manufacturing a motor rotor for a radial drum type permanent magnet synchronous motor according to claim 1, wherein: and d, arranging cover plates at two ends of the iron core block, wherein the cover plates are made of a magnetic isolation material, inert gas is adopted in an annealing process to protect the annealing atmosphere, the annealing temperature in the annealing process is selected within the range of 110-580 ℃, the annealing time is selected within the range of 0.5-4.5 hours, the heating rate is selected within the range of 1-30 ℃/min, and a magnetic field along the radial direction of the motor is applied to the iron core block in the annealing process within the range of 0-0.5T.
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| DE102021116070B4 (en) | 2021-06-22 | 2023-01-19 | Audi Aktiengesellschaft | Winding method for manufacturing a polygonal battery cell and device for manufacturing the polygonal battery cell |
| CN116099740B (en) * | 2021-11-09 | 2023-07-28 | 北京科益虹源光电技术有限公司 | Preparation method of insulating coating with wound iron core |
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