CN114400808A - Rotor disc, axial magnetic field motor rotor and manufacturing method - Google Patents
Rotor disc, axial magnetic field motor rotor and manufacturing method Download PDFInfo
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- CN114400808A CN114400808A CN202210080840.8A CN202210080840A CN114400808A CN 114400808 A CN114400808 A CN 114400808A CN 202210080840 A CN202210080840 A CN 202210080840A CN 114400808 A CN114400808 A CN 114400808A
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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
- H02K1/2793—Rotors axially facing stators
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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
- H02K1/02—Details of the magnetic circuit characterised by the magnetic material
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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
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
- H02K1/30—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures using intermediate parts, e.g. spiders
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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
Abstract
The invention provides a rotor disc, an axial magnetic field motor rotor and a manufacturing method, wherein the rotor disc comprises a rotor support and a plurality of magnetic pole plates, the magnetic pole plates are arranged on the rotor support along the circumferential direction, the two axial sides of the magnetic pole plates are exposed by the rotor support, the magnetic pole plates are formed by mixing magnetic steel and high-permeability magnets according to a preset proportion, the thickness of the magnetic steel of each magnetic pole plate is gradually reduced from the middle to the two sides of the magnetic pole plate along the circumferential direction, the sine degree of a magnetic field is improved, harmonic waves are reduced, the running performance of a motor is improved, the consumption of permanent magnets is reduced, and the magnetic pole optimization effect is realized.
Description
Technical Field
The invention relates to the field of axial magnetic field motors, in particular to a rotor disc, an axial magnetic field motor rotor and a manufacturing method.
Background
The axial magnetic field motor has an axial magnetic flux direction, so that the structure of the axial magnetic field motor is different from that of a common radial motor, and the axial magnetic field motor has the advantages of small volume, low noise, high rotating speed, high power density, excellent heat dissipation performance and the like. The axial magnetic field motor is classified according to the number of rotors, relative position, main magnetic circuit and the like, and the structure thereof can be divided into: single-stator single-rotor structure, double-stator single-rotor structure, single-stator double-rotor structure and multi-disc structure.
The air gap flux density waveform, the cogging torque, the torque fluctuation and the like can directly reflect the running performance of the motor. Specifically, the air gap flux density waveform refers to a curve of magnetic induction intensity in an air gap of the motor changing along with an angle position, the flux density waveform is limited by a manufacturing process of a motor, an ideal curve is a sine curve, and the higher the sine degree is, the fewer the harmonic waves are, the better the motor performance is. The rotor rotation of the motor in a current-off state can be subjected to periodic torque action due to stator slotting, the torque is cogging torque, and the average value of one rotation of the rotor is 0. The cogging torque affects the starting performance of the motor and also causes vibration noise in the operation process of the motor, so that the cogging torque is designed to be reduced as much as possible, and the magnitude of the cogging torque is generally expressed by a peak value (the difference between the maximum cogging torque and the minimum cogging torque of a rotor rotating for one circle). The torque output by the rotor shaft is not a constant value when the motor operates, and fluctuates around a certain value, which is called torque fluctuation and is generally measured by a torque fluctuation rate, wherein the torque fluctuation rate is the ratio of a torque peak value to an average value.
In the design of the axial magnetic field motor rotor, the thicknesses of a plurality of magnetic steels forming the rotor are kept consistent so as to realize uniform air gaps. The existing magnetic steel is made of the same permanent magnet material and is integrally formed, so that the sine degree of a magnetic field is poor due to the fact that the magnetic density of the motor is the same along the radial direction, a large amount of harmonic waves can be generated in the operation process of the motor, and due to the existence of the harmonic waves, the operation performance of the motor can be reduced, such as cogging torque, large torque fluctuation and large vibration noise.
In addition, the existing axial magnetic field motor generally adopts a surface-mounted permanent magnet structure, and the rotor surface-mounted permanent magnet structure motor has weaker capability of changing back electromotive force by adjusting the air gap magnetic field of the motor through frequency conversion control, thereby limiting the application range of the axial magnetic field motor. And moreover, the magnetic steel is magnetized and then assembled on the rotor, so that the assembly difficulty is increased.
And the permanent magnet material is mostly rare earth material, and the cost of the motor is continuously increased along with the continuous increase of the cost of the rare earth material, so how to reduce the using amount of the permanent magnet and ensure the performance of the axial magnetic field motor is a key problem to be solved by technical personnel in the field.
Disclosure of Invention
In order to solve the problems, the invention provides a rotor disc, an axial magnetic field motor rotor and a manufacturing method, wherein the rotor disc can effectively improve the motor performance and reduce the consumption of permanent magnets.
According to an object of the present invention, there is provided a rotor disc including a rotor support and a plurality of magnetic pole plates, the plurality of magnetic pole plates being circumferentially built in the rotor support and having both axial sides thereof exposed by the rotor support, the magnetic pole plates being formed by mixing magnetic steel and high-permeability magnets in a predetermined ratio, and the thickness of the magnetic steel of each of the magnetic pole plates being gradually reduced from the center of the magnetic pole plate to both circumferential sides thereof.
As a preferred embodiment, the magnetic pole plate includes a plurality of magnetic pole strips spliced along the circumferential direction, and the magnetic pole strips are formed by axially laminating the magnetic steel and the high-permeability magnet according to a preset thickness ratio.
As a preferred embodiment, the radial both sides of magnetic pole strip extend respectively and form and are used for joint the magnetic pole step portion of rotor support, and every magnetic pole step portion thickness is unanimous to after a plurality of magnetic pole strip concatenation forms the magnetic pole plate, be located a plurality of radial homonymy magnetic pole step portion forms the unanimous magnetic pole step of thickness.
As a preferred embodiment, the radial dimension of the high-permeability magnet is smaller than the radial dimension of the magnetic steel, and the high-permeability magnet is located in the middle of the magnetic steel, so that the magnetic steel exceeds the parts on the two radial sides of the high-permeability magnet to form magnetic pole step parts, so that after the magnetic pole strips are spliced to form the magnetic pole plate, the magnetic pole step parts located on the same radial side form magnetic pole steps, and the thickness of the magnetic pole steps is gradually reduced from the middle to the two sides along the circumferential direction.
As the preferred embodiment, the radial dimension of high magnetizer is greater than the radial dimension of magnet steel, and the magnet steel is located the intermediate position of high magnetizer, so that high magnetizer surpasss the part of the radial both sides of magnet steel forms magnetic pole step portion, so that after a plurality of the magnetic pole strip concatenation forms the magnetic pole board, be located a plurality of radial homonymy magnetic pole step portion forms the magnetic pole step, and the thickness of magnetic pole step is followed circumference and is crescent to both sides by centre.
As a preferred embodiment, the rotor support includes a support inner ring, a support outer ring, and a plurality of support rods connecting the support inner ring and the support outer ring, a magnetic pole plate is disposed between two adjacent support rods, and the radial two sides of the magnetic pole plate are respectively clamped with the support inner ring and the support outer ring through the magnetic pole steps.
As a preferred embodiment, the thickness of the pole plate is greater than or equal to the axial dimension of the rotor support.
As a preferred embodiment, the radial dimension of the rotor disc is much larger than the axial dimension of the rotor disc.
According to another object of the present invention, the present invention further provides an axial magnetic field motor rotor, which comprises one or two rotor disks of the above embodiments, and when the number of the rotor disks is two, the two rotor disks are axially overlapped with the magnetic pole plates in a one-to-one correspondence. According to another object of the present invention, the present invention further provides a method for manufacturing a rotor of an axial field motor, comprising:
providing two non-magnetized rotor discs, wherein each rotor disc comprises a rotor support and a plurality of magnetic pole plates, the magnetic pole plates are arranged on the rotor support along the circumferential direction, two axial sides of each magnetic pole plate are exposed by the rotor support, and the magnetic pole plates are formed by mixing non-magnetized magnetic steel and high-permeability magnets according to a preset proportion;
placing the rotor disc which is not magnetized into a magnetizing machine integrally for magnetizing;
and overlapping the two magnetized rotor disks along the axial direction, wherein the magnetic pole plates of the two rotor disks correspond to each other one by one and form magnetic poles, the thickness of the magnetic steel of each magnetic pole is gradually reduced from the middle of the magnetic pole to the two circumferential sides, and the magnetizing directions of the two adjacent magnetic poles are opposite.
Compared with the prior art, the technical scheme has the following advantages:
the magnetic steel of the middle part of each magnetic pole occupies the highest ratio, and the magnetic steel of the two sides along the circumferential direction of the magnetic pole occupies the ratio and is gradually reduced, at the moment, the magnetic density of the magnetic steel is gradually reduced from the middle to the two sides along the circumferential direction, so that the sine degree of a magnetic field is improved, the generation of harmonic waves is reduced, and the running performance of the motor is improved. And the magnetic pole is formed by mixing the magnetic steel and the high magnetizer according to a preset thickness proportion, wherein the magnetic steel can be made of a permanent magnet material, and the high magnetizer can be made of a permanent magnet or a soft magnet material, so that the using amount of the permanent magnet is reduced and the magnetic pole optimization effect is realized compared with the whole permanent magnet material. In addition, the axial magnetic field motor rotor adopts a structure of axially overlapping two rotor disks, so that a better condition is provided for magnetizing, namely, each rotor disk is magnetized firstly, and then the two rotor disks are axially overlapped to form the axial magnetic field motor rotor. Moreover, the magnetic poles are arranged in the rotor disc, so that the defect of limitation of application range caused by a surface pasting mode in the prior art is overcome.
The invention is further described with reference to the following figures and examples.
Drawings
FIG. 1 is a schematic structural view of a first embodiment of an axial field electric machine rotor according to the present invention;
FIG. 2 is a schematic structural view of a first embodiment of a magnetic pole plate according to the present invention;
fig. 3 is a schematic structural view of a first embodiment of the pole piece of the present invention;
FIG. 4 is a schematic structural view of a first embodiment of a rotor support according to the present invention;
FIG. 5 is a schematic structural view of a second embodiment of an axial field electric machine rotor according to the present invention;
FIG. 6 is a schematic structural view of a second embodiment of a pole plate according to the present invention;
FIG. 7 is a schematic structural view of a second embodiment of a rotor support according to the present invention;
FIG. 8 is a schematic structural view of a third embodiment of an axial field electric machine rotor according to the present invention;
fig. 9 is a schematic structural view of a third embodiment of a magnetic pole plate according to the present invention;
FIG. 10 is a schematic structural view of a third embodiment of a rotor support according to the present invention;
FIG. 11 is a flow chart of a method of magnetizing a rotor of an axial field electric machine according to the present invention;
FIG. 12 is a graph showing a magnetic flux density waveform.
In the figure: 100 rotor disc, 110 rotor bracket, 111 bracket inner ring, 112 bracket outer ring, 113 bracket rod, 114 bracket step, 120 magnetic pole plate, 121 magnetic pole strip, 1211 magnetic steel, 1212 high magnetic conductor, 1213 magnetic pole step, A magnetic pole, B magnetic pole step.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
As shown in fig. 1, 5 and 8, the rotor disk 100 includes a rotor support 110 and a plurality of magnetic pole plates 120, the plurality of magnetic pole plates 120 are circumferentially disposed in the rotor support 110, and both axial sides of the magnetic pole plates 120 are exposed by the rotor support 110, the magnetic pole plates 120 are formed by mixing a magnetic steel 1211 and a high-permeability magnet 1212 according to a preset ratio, and the thickness of the magnetic steel 1211 of each magnetic pole plate 120 is gradually reduced from the middle of the magnetic pole plate 120 to both circumferential sides. .
The axial field electric machine rotor can be formed by axially laminating one rotor disc 100 or two rotor discs 100, and when a rotor is formed by a single rotor disc 100, each magnetic pole plate 120 on the rotor disc 100 forms a magnetic pole a. When the two rotor disks 100 are axially overlapped to form a rotor, the magnetic pole plates 120 of the two rotor disks 100 are in one-to-one correspondence and form magnetic poles a, however, no matter the axial magnetic field motor rotor is formed by a single rotor disk 100 or a double rotor disk 100, the occupation ratio of the magnetic steel 1211 at the middle part of each magnetic pole a is the highest, the occupation ratios of the magnetic steels at two sides along the circumferential direction of the magnetic pole a are gradually reduced, at the moment, the magnetic densities of the magnetic steels are gradually reduced from the middle to the two sides along the circumferential direction, so that the sine degree of the magnetic field is improved, the generation of harmonic waves is reduced, and the running performance of the motor is improved. The magnetic pole a is formed by mixing the magnetic steel 1211 and the high-permeability magnet 1212 according to a preset ratio, wherein the magnetic steel 1211 can be made of a permanent magnet material, and the high-permeability magnet 1212 can be made of a permanent magnet or a soft magnet material, so that the usage amount of the permanent magnet is reduced and the magnetic pole is optimized compared with the overall use of the permanent magnet material. In addition, the axial magnetic field motor rotor adopts a structure of axially overlapping two rotor disks 100, so that a better condition is provided for magnetizing, namely, each rotor disk 100 is magnetized firstly, and then the two rotor disks 100 are axially overlapped to form the axial magnetic field motor rotor, so that compared with the prior art of magnetizing firstly, the difficulty of rotating and matching the magnetic steel 1211 caused by interaction is avoided, and the difficulty of rotating and matching the magnetic steel 1211 on the rotor support 110 is increased. Moreover, the magnetic pole a is arranged in the rotor disc 100, so that the defect of limited application range caused by the surface-mounted mode in the prior art is overcome.
The invention also provides an axial magnetic field motor rotor, which comprises one or two rotor disks 100 of the above embodiment, and when the number of the rotor disks 100 is two, the magnetic pole plates 120 of the two rotor disks 100 correspond to each other and form magnetic poles a. Since the rotor disk 100 of the above embodiment is adopted for the rotor of the axial magnetic field motor, the rotor of the axial magnetic field motor has the advantages brought by the rotor disk 100, and the rotor of the axial magnetic field motor refers to the above embodiment.
According to the different thickness ratios of the magnetic steel 1211 and the high-permeability magnet 1212, the shapes of the magnetic pole plates 120 formed by splicing are different, and the shapes of the rotor supports 110 for fixing the magnetic pole plates 120 are also different, and the following takes the example that the dual-rotor disk 100 constitutes an axial magnetic field motor rotor, and the detailed description is provided by three embodiments.
First embodiment
As shown in fig. 1 to fig. 3, the magnetic pole plate 120 includes a plurality of magnetic pole strips 121 spliced along the circumferential direction, and the magnetic pole strips 121 are formed by axially laminating the magnetic steel 1211 and the high-permeability magnet 1212 according to a predetermined thickness ratio. After the plurality of magnetic pole strips 121 are spliced to form the magnetic pole plate 120, the magnetic steel occupation ratio of the magnetic pole strip 121 in the middle is highest, and the magnetic steel occupation ratios of the two sides in the circumferential direction of the magnetic pole plate 120 are gradually reduced, that is, the magnetic steel occupation ratios of the magnetic pole strips 121 in the two sides in the circumferential direction of the magnetic pole plate 120 are minimum, so that the sine degree of the magnetic field is improved.
The magnetic pole plate 120 can be divided into a plurality of magnetic pole strips 121 according to actual conditions, and the more the magnetic pole strips 121 are divided, the better the magnetic field sine degree is.
As shown in fig. 2, in the structure of the magnetic plate 120, the magnetic pole strip 121 in the middle may not have the high-permeability magnet 1212, i.e. the magnetic steel 1211 is used as a whole.
As shown in fig. 2 and 3, each of the magnetic pole strips 121 constituting the magnetic pole plate 120 has a uniform shape and is shaped like a sector, wherein the sector-shaped inner edge of the magnetic pole strip 121 is concave, and the sector-shaped outer edge of the magnetic pole strip 121 is convex, so that the magnetic pole plate 120 formed by splicing a plurality of magnetic pole strips 121 having the same shape is also shaped like a sector, and the sector-shaped inner edge of the magnetic pole plate 120 is concave and the sector-shaped outer edge of the magnetic pole plate 120 is convex.
Further, the thickness and radial dimension of the plurality of pole pieces 121 constituting the pole plate 120 are respectively consistent to form the structurally symmetrical and thinner pole plate 120.
As shown in fig. 2 and fig. 3, two radial sides of the magnetic pole strips 121 respectively extend to form magnetic pole step portions 1213 for clamping the rotor holder 110, and each of the magnetic pole step portions 1213 has a uniform thickness, so that after the magnetic pole strips 121 are spliced to form the magnetic pole plate 120, the magnetic pole step portions 1213 located on the same radial side form a magnetic pole step B having a uniform thickness.
In particular, the axial dimension of the pole step 1213 is smaller than the axial dimension of the pole strip 121, which is flush with the side of the pole strip 121 on which the magnetic steel 1211 is arranged, see fig. 3. The magnetic pole step portions 1213 may be integrally formed with the magnetic pole strip 121, and the material of the magnetic pole step portions 1213 is determined by the material of the connection portions of the magnetic pole strip 121 and the magnetic pole step portions 1213, for example, the material of the connection portions of the magnetic pole strip 121 and the magnetic pole step portions 1213 is the magnetic steel 1211, and the material of the magnetic pole step portions 1213 is also the magnetic steel 1211. When the material of the connection portion between the magnetic pole strip 121 and the magnetic pole step portion 1213 is divided into the high magnetizer 1212 and the magnetic steel 1211 from top to bottom, the material of the magnetic pole step portion 1213 from top to bottom is also the high magnetizer 1212 and the magnetic steel 1211.
More specifically, since the magnetic pole step portions 1213 of the plurality of magnetic pole pieces 121 constituting the magnetic pole plate 120 are uniform in thickness, since the plurality of magnetic pole step portions 1213 located on the same radial side form a magnetic pole step B uniform in thickness, refer to fig. 2.
As shown in fig. 1, 2 and 4, the rotor support 110 includes a support inner ring 111, a support outer ring 112 and a plurality of support rods 113 connecting the support inner ring 111 and the support outer ring 112, a magnetic pole plate 120 is disposed between two adjacent support rods 113, and two radial sides of the magnetic pole plate 120 are respectively clamped to the support inner ring 111 and the support outer ring 112 through the magnetic pole step B.
Referring to fig. 4, opposite inner sides of the inner ring 111 and the outer ring 112 of the bracket are respectively provided with a bracket step 114 for clamping the magnetic pole step 1213, the axial dimensions of the plurality of bracket steps 114 are the same to adapt to the installation of the magnetic pole step B with the same axial dimension, and during installation, the plurality of magnetic pole strips 121 can be placed between two adjacent bracket rods 113 one by one, so that the plurality of magnetic pole strips 121 between two adjacent bracket rods 113 are spliced to form the magnetic pole plate 120.
The radial two sides of the magnetic pole plate 120 are respectively clamped with the support inner ring 111 and the support outer ring 112 through the magnetic pole step B, so that the magnetic pole plate 120 is respectively flush with the axial two sides of the rotor support 110, the advantage that the axial size of the rotor disc 100 is small is ensured, and further, the radial size of the rotor disc 100 is far larger than the axial size of the rotor disc 100.
Referring to fig. 1, the two corresponding magnetic pole plates 120 are stacked in such a manner that the magnetic steel 1211 is disposed inside, so as to form the magnetic pole a, and the high-permeability magnet 1212 is exposed on both axial sides of the magnetic pole a. When the rotor and the stator are coaxial and the air gap is arranged, the exposed side of the magnetic pole A in the thickness direction can be matched with the stator, for example, the magnetic pole A is applied to a single-rotor double-stator axial magnetic field motor, the two stators are coaxially and air-gap-retained on the two sides of the rotor, so that the two exposed sides of the magnetic pole A in the thickness direction respectively interact with the two stators.
In summary, the magnetic pole step portions 1213 of the plurality of magnetic pole strips 121 constituting the magnetic pole plate 120 have the same thickness, because the magnetic pole step portions 1213 located on the same radial side form the magnetic pole step B having the same thickness, and the opposite inner sides of the support inner ring 111 and the support outer ring 112 are respectively provided with the support step portions 114 for clamping the magnetic pole step portions 1213, and the axial dimensions of the support step portions 114 are the same to adapt to the magnetic pole step B having the same axial dimension, thereby reducing the processing difficulty and ensuring the structural stability.
Second embodiment
As shown in fig. 5 to fig. 7, the second embodiment of the axial magnetic field motor rotor is different from the first embodiment in that the radial dimension of the high-permeability conductor 1212 is smaller than the radial dimension of the magnetic steel 1211, and the high-permeability conductor 1212 is located in the middle of the magnetic steel 1211, so that the magnetic pole step portion 1213 is formed at the portion of the magnetic steel 1211, which exceeds the two radial sides of the high-permeability conductor 1212, so that after the plurality of magnetic pole strips 121 are spliced to form the magnetic pole plate 120, the plurality of magnetic pole step portions 1213 located on the same radial side form a magnetic pole step B, and the thickness of the magnetic pole step B gradually decreases from the middle to the two sides along the circumferential direction.
It can be seen that the magnetic steel 1211 determines the thickness of the magnetic pole step B, and the thicknesses of the two are the same. Referring to fig. 7, opposite inner sides of the holder inner ring 111 and the holder outer ring 112 are respectively provided with a holder step portion 114 for clamping the magnetic pole step portion 1213, wherein a sum of thicknesses of the clamped magnetic pole step portion 1213 and the holder step portion 114 is equal to a thickness of the rotor holder 110, so that after the magnetic pole strips 121 are clamped to the holder inner ring 111 and the holder outer ring 112, the magnetic pole strips 121 are respectively flush with or slightly protruded from two axial sides of the rotor holder 110, so that the thickness of the magnetic pole plate 120 is greater than or equal to an axial dimension of the rotor holder 110.
Since the thickness of each of the pole step portions 1213 constituting the pole plate 120 is different, the thicknesses of the holder step portions 114 on the holder inner ring 111 and the holder outer ring 112 are also different. Referring to fig. 6, the thickness of the magnetic pole step B is gradually reduced from the middle to both sides along the circumferential direction, and accordingly, the support step 114 is gradually increased from the middle to both sides along the circumferential direction to ensure that the magnetic pole plates 120 are respectively flush with or slightly protruded from the two sides of the rotor support 110 along the axial direction.
As shown in fig. 5, when the two rotor disks 100 are stacked in the axial direction, the corresponding two magnetic pole plates 120 are stacked in such a manner that the magnetic steel 1211 is disposed inside to form the magnetic pole a, and the high-permeability magnet 1212 is exposed on both axial sides of the magnetic pole a.
Referring to fig. 6, in the structure of the magnetic plate 120, the magnetic pole strip 121 located at the middle most may not have the high-permeability magnet 1212, and only the magnetic steel 1211 may be scaled according to design requirements.
Third embodiment
As shown in fig. 8 to 10, the third embodiment of the axial magnetic field motor rotor is different from the second embodiment in that the radial dimension of the high-permeability conductor 1212 is larger than the radial dimension of the magnetic steel 1211, and the magnetic steel 1211 is located in the middle of the high-permeability conductor 1212, so that the portions of the high-permeability conductor 1212, which exceed the two radial sides of the magnetic steel 1211, form magnetic pole steps 1213, so that after the plurality of magnetic pole strips 121 are spliced to form the magnetic pole plate 120, the plurality of magnetic pole steps 1213 located on the same radial side form a magnetic pole step B, and the thickness of the magnetic pole step B gradually increases along the circumferential direction and from the middle to the two sides.
It can be seen that the high magnetic conductor 1212 determines the thickness of the pole step B and that the thicknesses of both are uniform. Referring to fig. 10, opposite inner sides of the holder inner ring 111 and the holder outer ring 112 are respectively provided with a holder step portion 114 for clamping the magnetic pole step portion 1213, wherein a sum of thicknesses of the clamped magnetic pole step portion 1213 and the holder step portion 114 is equal to a thickness of the rotor holder 110, so that after the magnetic pole strips 121 are clamped to the holder inner ring 111 and the holder outer ring 112, the magnetic pole strips 121 are respectively flush with or slightly protruded from two axial sides of the rotor holder 110, so that the thickness of the magnetic pole plate 120 is greater than or equal to an axial dimension of the rotor holder 110.
Since the thickness of each of the pole step portions 1213 constituting the pole plate 120 is different, the thicknesses of the holder step portions 114 on the holder inner ring 111 and the holder outer ring 112 are also different. Referring to fig. 10, the thickness of the magnetic pole step B is gradually increased from the middle to both sides in the circumferential direction, and accordingly, the support step 114 is gradually decreased from the middle to both sides in the circumferential direction, so as to ensure that the magnetic pole plates 120 are respectively flush with or slightly protruded from both sides in the axial direction of the rotor support 110.
As shown in fig. 10, when the two rotor disks 100 are stacked in the axial direction, the corresponding two magnetic pole plates 120 are stacked in such a manner that the high-permeability magnet 1212 is embedded in the magnetic pole a, and the magnetic steel 1211 is exposed on both axial sides of the magnetic pole a.
As shown in fig. 1 to 8, the method for manufacturing the axial magnetic field motor rotor includes:
s100, providing two non-magnetized rotor disks 100, where the rotor disks 100 include a rotor support 110 and a plurality of magnetic pole plates 120, the plurality of magnetic pole plates 120 are circumferentially disposed in the rotor support 110, and two axial sides of the magnetic pole plates 120 are exposed by the rotor support 110, and the magnetic pole plates 120 are formed by mixing non-magnetized magnetic steel 1211 and high-permeability magnets 1212 according to a preset ratio;
s200, integrally placing the rotor disc 100 which is not magnetized in a magnetizing machine for integral magnetizing; s300, axially overlapping the two magnetized rotor disks 100, wherein the magnetic pole plates 120 of the two rotor disks 100 are in one-to-one correspondence and form magnetic poles a, the thickness of the magnetic steel 1211 of each magnetic pole a gradually decreases from the middle of the magnetic pole a to the circumferential two sides, and the magnetizing directions of the two adjacent magnetic poles a are opposite.
The magnetic pole plate 120 includes a plurality of magnetic pole strips 121 spliced along the circumferential direction, and the magnetic pole strips 121 are formed by axially laminating the magnetic steel 1211 and the high-permeability magnet 1212 according to a preset ratio. Further, in the step S100, the plurality of sets of magnetic pole strips 121 are clamped on the rotor support 110 one by one, so that each set of magnetic pole strips 121 are spliced to form the magnetic pole plate 120.
In the step S200, since the shape of each of the rotor disks 100 is the same, the same magnetizing fixture can be used to magnetize two of the rotor disks 100 one by one, so as to realize recycling of the magnetizing fixture, reduce the use cost of the magnetizing equipment, and correspondingly improve the magnetizing efficiency. The magnetization direction of the magnetic poles A is along the axial direction, and the magnetization directions of two adjacent magnetic poles A are opposite.
The manufacturing method comprises the steps of firstly mixing the magnetic steel and the magnetic pole strips 121 of the high-permeability magnets and clamping the magnetic steel and the magnetic pole strips on the rotor support 110 to form the rotor disc 100 which is provided with a plurality of magnetic pole plates 120 and is not magnetized, then magnetizing the rotor discs 100 one by one, finally superposing the two magnetized rotor discs 100 along the axial direction, and simultaneously ensuring that the magnetic pole plates 120 of the two rotor discs 100 correspond to each other one by one and form magnetic poles A, and the magnetizing directions of the two adjacent magnetic poles A are opposite. Compared with the prior art of prior magnetization, the difficulty of transferring and matching the magnetic steel on the rotor support 110 is increased due to the fact that interaction between the magnetic steels is avoided, and therefore the magnetizing method effectively reduces the assembling difficulty and improves the assembling, manufacturing and forming efficiency.
The above-mentioned embodiments are only for illustrating the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the same, and the scope of the present invention is not limited by the embodiments, i.e. all equivalent changes or modifications made in the spirit of the present invention are still within the scope of the present invention.
Claims (10)
1. A rotor disc, characterized in that the rotor disc (100) comprises a rotor support (110) and a plurality of magnetic pole plates (120), the plurality of magnetic pole plates (120) are arranged on the rotor support (110) along the circumferential direction, and the two axial sides of the magnetic pole plates (120) are exposed by the rotor support (110), the magnetic pole plates (120) are formed by mixing magnetic steel (1211) and high magnetizer (1212) according to a preset proportion, and the thickness of the magnetic steel (1211) of each magnetic pole plate (120) is gradually reduced from the middle to the two circumferential sides of the magnetic pole plate (120).
2. The rotor disc of claim 1, characterized in that the magnetic pole plate (120) comprises a plurality of magnetic pole strips (121) spliced along the circumferential direction, and the magnetic pole strips (121) are formed by axially laminating the magnetic steel (1211) and the high-permeability magnet (1212) according to a preset thickness ratio.
3. The rotor disc of claim 2, characterized in that the two radial sides of the pole strips (121) extend to form pole steps (1213) for clamping the rotor support (110), and each pole step (1213) has a uniform thickness, so that after the pole strips (121) are spliced to form the pole plate (120), the pole steps (1213) on the same radial side form a pole step (B) with a uniform thickness.
4. The rotor disc of claim 2, wherein the radial dimension of the high-permeability conductor (1212) is smaller than the radial dimension of the magnetic steel (1211), and the high-permeability conductor (1212) is located in the middle of the magnetic steel (1211), so that the portion of the magnetic steel (1211) beyond the two radial sides of the high-permeability conductor (1212) forms a magnetic pole step (1213), so that after the plurality of magnetic pole strips (121) are spliced to form the magnetic pole plate (120), the plurality of magnetic pole steps (1213) located on the same radial side form a magnetic pole step (B), and the thickness of the magnetic pole step (B) gradually decreases from the middle to the two sides along the circumferential direction.
5. The rotor disk of claim 2, wherein the radial dimension of the high-permeability magnet (1212) is larger than the radial dimension of the magnetic steel (1211), and the magnetic steel (1211) is located in the middle of the high-permeability magnet (1212), so that the portion of the high-permeability magnet (1212) beyond the two radial sides of the magnetic steel (1211) forms a magnetic pole step (1213), so that after the magnetic pole plate (120) is formed by splicing a plurality of the magnetic pole strips (121), the plurality of magnetic pole steps (1213) located on the same radial side form a magnetic pole step (B), and the thickness of the magnetic pole step (B) gradually increases from the middle to the two sides along the circumferential direction.
6. The rotor disc of claim 3, 4 or 5, characterized in that the rotor support (110) comprises a support inner ring (111), a support outer ring (112) and a plurality of support rods (113) connecting the support inner ring (111) and the support outer ring (112), a magnetic pole plate (120) is arranged between two adjacent support rods (113), and two radial sides of the magnetic pole plate (120) are respectively clamped with the support inner ring (111) and the support outer ring (112) through the magnetic pole step (B).
7. The rotor disc according to claim 1, characterized in that the thickness of the pole plate (120) is greater than or equal to the axial dimension of the rotor support (110).
8. The rotor disc of claim 1, characterized in that the radial dimension of the rotor disc (100) is much larger than the axial dimension of the rotor disc (100).
9. An axial field machine rotor, characterized in that it comprises one or two rotor discs (100) according to any one of claims 1 to 8, when there are two rotor discs (100), the two rotor discs (100) are axially stacked with one-to-one correspondence of the magnetic pole plates (120).
10. A method for manufacturing an axial magnetic field motor rotor comprises the following steps:
providing two non-magnetized rotor disks (100), wherein the rotor disks (100) comprise a rotor support (110) and a plurality of magnetic pole plates (120), the magnetic pole plates (120) are arranged on the rotor support (110) along the circumferential direction, the two axial sides of the magnetic pole plates (120) are exposed by the rotor support (110), and the magnetic pole plates (120) are formed by mixing non-magnetized magnetic steel (1211) and high-permeability magnets (1212) according to a preset proportion;
integrally placing the rotor disc (100) which is not magnetized into a magnetizing machine for integral magnetizing;
the two magnetized rotor disks (100) are overlapped along the axial direction, wherein the magnetic pole plates (120) of the two rotor disks (100) correspond to each other one by one and form magnetic poles (A), the thickness of the magnetic steel (1211) of each magnetic pole (A) is gradually reduced from the middle of the magnetic pole (A) to the two circumferential sides, and the magnetizing directions of the two adjacent magnetic poles (A) are opposite.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210080840.8A CN114400808A (en) | 2022-01-24 | 2022-01-24 | Rotor disc, axial magnetic field motor rotor and manufacturing method |
| PCT/CN2022/114714 WO2023138051A1 (en) | 2022-01-24 | 2022-08-25 | Rotor disc, axial magnetic field motor rotor, and manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210080840.8A CN114400808A (en) | 2022-01-24 | 2022-01-24 | Rotor disc, axial magnetic field motor rotor and manufacturing method |
Publications (1)
| Publication Number | Publication Date |
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| CN114400808A true CN114400808A (en) | 2022-04-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210080840.8A Pending CN114400808A (en) | 2022-01-24 | 2022-01-24 | Rotor disc, axial magnetic field motor rotor and manufacturing method |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN114400808A (en) |
| WO (1) | WO2023138051A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023138051A1 (en) * | 2022-01-24 | 2023-07-27 | 浙江盘毂动力科技有限公司 | Rotor disc, axial magnetic field motor rotor, and manufacturing method |
| WO2023137933A1 (en) * | 2022-01-24 | 2023-07-27 | 浙江盘毂动力科技有限公司 | Axial-field electric motor rotor and method for manufacturing same, and axial-field electric motor |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102510192A (en) * | 2011-12-01 | 2012-06-20 | 中国船舶重工集团公司第七一二研究所 | Sine wave disk type permanent magnet generator with novel magnetic pole structure |
| JP2018166354A (en) * | 2017-03-28 | 2018-10-25 | Ntn株式会社 | Axial gap-type motor and manufacturing method of the same |
| CN107872111B (en) * | 2017-11-10 | 2020-06-19 | 沈阳工业大学 | High-strength sandwich magnetic pole rotor of double-stator axial flux permanent magnet motor |
| CN211655867U (en) * | 2020-04-26 | 2020-10-09 | 仪坤动力科技（上海）有限公司 | Disk type motor rotor with pole shoe composite magnetic pole structure |
| CN215580607U (en) * | 2021-10-09 | 2022-01-18 | 浙江盘毂动力科技有限公司 | Low-harmonic axial flux motor rotor and double-stator single-rotor motor |
| CN114400808A (en) * | 2022-01-24 | 2022-04-26 | 浙江盘毂动力科技有限公司 | Rotor disc, axial magnetic field motor rotor and manufacturing method |
-
2022
- 2022-01-24 CN CN202210080840.8A patent/CN114400808A/en active Pending
- 2022-08-25 WO PCT/CN2022/114714 patent/WO2023138051A1/en unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023138051A1 (en) * | 2022-01-24 | 2023-07-27 | 浙江盘毂动力科技有限公司 | Rotor disc, axial magnetic field motor rotor, and manufacturing method |
| WO2023137933A1 (en) * | 2022-01-24 | 2023-07-27 | 浙江盘毂动力科技有限公司 | Axial-field electric motor rotor and method for manufacturing same, and axial-field electric motor |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2023138051A1 (en) | 2023-07-27 |
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