WO2023138051A1

WO2023138051A1 - Rotor disc, axial magnetic field motor rotor, and manufacturing method

Info

Publication number: WO2023138051A1
Application number: PCT/CN2022/114714
Authority: WO
Inventors: 王治会; 陈翾; 方德华
Original assignee: 浙江盘毂动力科技有限公司
Priority date: 2022-01-24
Filing date: 2022-08-25
Publication date: 2023-07-27
Also published as: CN114400808A

Abstract

The present invention provides a rotor disc, an axial magnetic field motor rotor, and a manufacturing method. The rotor disc comprises a rotor support and a plurality of magnetic pole plates; the plurality of magnetic pole plates are arranged on the rotor support in a circumferential direction; the two axial sides of each magnetic pole plate are exposed by the rotor support; the magnetic pole plate is formed by mixing magnetic steel and high magnetizers according to a preset proportion; and the thickness of the magnetic steel of each magnetic pole plate is gradually reduced from the middle of the magnetic pole plate to the two sides of the magnetic pole plate in the circumferential direction. Therefore, the sine degree of a magnetic field is improved, the generation of harmonic waves is reduced, the operation performance of a motor is improved, the use amount of permanent magnets is reduced, and a magnetic pole optimization effect is achieved.

Description

Rotor disk, axial field motor rotor and manufacturing method

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 technique

Because of the axial magnetic flux direction, the axial field motor has a structure different from that of ordinary radial motors. The axial field motor has many advantages such as small size, low noise, high speed, high power density, and excellent heat dissipation performance. Axial field motors are classified according to the number of rotors, relative position and main magnetic circuit, and their structures can be divided into: single stator single rotor structure, double stator single rotor structure, single stator double rotor structure and multi-disk structure.

Among them, the air gap magnetic density waveform, cogging torque and torque ripple can directly reflect the operating performance of the motor. Specifically, the air gap flux density waveform refers to the curve of the magnetic induction intensity in the air gap of the motor changing with the angular position. The flux density waveform is restricted by the motor manufacturing process. The ideal curve is a sinusoidal curve. The higher the sine degree and the fewer harmonics, the better the motor performance. Due to the slotting of the stator, the motor will be subject to periodic torque when the rotor is rotated without current. The torque is cogging torque, and the average value of the rotor rotation is 0. The cogging torque will affect the starting performance of the motor, and will also cause vibration and noise during the operation of the motor. Therefore, when designing the motor, the cogging torque should be reduced as much as possible. The cogging torque is generally represented by the peak value (the difference between the maximum and minimum cogging torque for one revolution of the rotor). When the motor is running, the output torque of the rotor shaft is not a constant value, but will fluctuate around a certain value. This phenomenon is called torque fluctuation, which is generally measured by the torque fluctuation rate, which is the ratio of the torque peak-to-peak value to the average value.

In the design of the axial field motor rotor, the thickness of the multiple magnetic steels that make up the rotor is kept consistent to achieve a uniform air gap. The existing magnetic steels use the same permanent magnet material and are integrally formed. It can be seen that the magnetic flux density of the motor is the same in the radial direction, resulting in poor sine of the magnetic field, which will generate a large number of harmonics during the operation of the motor. Due to the existence of these harmonics, the operating performance of the motor will be reduced, such as cogging torque, large torque fluctuations, and large vibration noise.

In addition, the current axial field motor generally adopts a surface-mounted permanent magnet structure. This kind of rotor surface-mounted permanent magnet structure motor adjusts the air gap magnetic field of the motor through frequency conversion control, and the ability to change the back electromotive force is relatively weak, thus limiting the application range of the axial field motor. Furthermore, the magnetic steel is assembled on the rotor after being magnetized, which increases the difficulty of assembly.

Moreover, most of the permanent magnet materials are rare earth materials. As the cost of rare earth materials continues to rise, the cost of the motor also continues to rise. Therefore, how to reduce the amount of permanent magnets while ensuring the performance of the axial magnetic field motor is a key problem to be solved by those skilled in the art.

Contents of the invention

In order to solve the above problems, the present invention provides a rotor disk, an axial magnetic field motor rotor and a manufacturing method that can effectively improve the performance of the motor and reduce the amount of permanent magnets.

According to an object of the present invention, the present invention provides a rotor disc, the rotor disc includes a rotor bracket and a plurality of magnetic pole plates, the plurality of magnetic pole plates are built into the rotor bracket along the circumferential direction, and the axial sides of the magnetic pole plates are exposed by the rotor bracket, the magnetic pole plates are made of a mixture of magnetic steel and high magnetic permeability according to a preset ratio, and the thickness of the magnetic steel of each magnetic pole plate gradually decreases from the middle of the magnetic pole plate to the circumferential sides.

As a preferred embodiment, the magnetic pole plate includes a plurality of circumferentially spliced magnetic pole strips, and the magnetic pole strips are formed by axially stacking the magnetic steel and the high magnetoconductor according to a preset thickness ratio.

As a preferred embodiment, the two radial sides of the magnetic pole strip respectively extend to form a magnetic pole step for clamping the rotor bracket, and each of the magnetic pole step has the same thickness, so that after a plurality of the magnetic pole strips are spliced to form the magnetic pole plate, a plurality of the magnetic pole steps on the same side in the radial direction form a magnetic pole step with a uniform thickness.

As a preferred embodiment, the radial dimension of the high magnetic permeability is smaller than the radial dimension of the magnetic steel, and the high magnetic permeability is located in the middle of the magnetic steel, so that the parts of the magnetic steel beyond the radial sides of the high magnetic permeability form a magnetic pole step, so that after a plurality of the magnetic pole strips are spliced to form the magnetic pole plate, a plurality of the magnetic pole steps on the same side in the radial direction form a magnetic pole step, and the thickness of the magnetic pole step gradually decreases along the circumference and from the middle to both sides.

As a preferred embodiment, the radial dimension of the high magnetic permeability body is larger than the radial dimension of the magnetic steel, and the magnetic steel is located in the middle of the high magnetic permeability body, so that the parts of the high magnetic permeability body beyond the radial sides of the magnetic steel form a magnetic pole step, so that after a plurality of the magnetic pole strips are spliced to form the magnetic pole plate, a plurality of the magnetic pole step portions located on the same radial side form a magnetic pole step, and the thickness of the magnetic pole step gradually increases along the circumferential direction and from the middle to both sides.

As a preferred embodiment, the rotor bracket includes a bracket inner ring, a bracket outer ring, and several bracket rods connecting the bracket inner ring and the bracket outer ring, a magnetic pole plate is arranged between two adjacent bracket rods, and the radial sides of the magnetic pole plate are respectively clamped to the bracket inner ring and the bracket outer ring through the magnetic pole steps.

As a preferred embodiment, the thickness of the magnetic 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 disk is much larger than the axial dimension of the rotor disk.

According to another object of the present invention, the present invention also provides an axial field motor rotor, which includes one or two rotor disks of the above-mentioned embodiments. When the number of the rotor disks is two, the two rotor disks are axially stacked with the magnetic pole plates corresponding to each other. According to another object of the present invention, the present invention also provides a method for manufacturing an axial field motor rotor, including:

Two unmagnetized rotor discs are provided, the rotor discs include a rotor bracket and a plurality of magnetic pole plates, a plurality of the magnetic pole plates are built into the rotor bracket along the circumferential direction, and both axial sides of the magnetic pole plates are exposed by the rotor bracket, and the magnetic pole plates are formed by mixing unmagnetized magnetic steel and high magnetizer according to a preset ratio;

placing the unmagnetized rotor disk as a whole in a magnetizer for overall magnetization;

The two magnetized rotor disks are superimposed in the axial direction, wherein the magnetic pole plates of the two rotor disks correspond to each other and form magnetic poles, the thickness of the magnetic steel of each magnetic pole gradually decreases from the middle of the magnetic pole to both sides in the circumferential direction, and the magnetization directions of the two adjacent magnetic poles are opposite.

Compared with the prior art, this technical solution has the following advantages:

The proportion of the magnetic steel in the middle part of each magnetic pole is the highest, and the proportion of the magnetic steel on both sides of the circumferential direction of the magnetic pole decreases gradually. At this time, the magnetic density of the magnetic steel gradually decreases from the middle to the circumferential sides, thereby increasing the sine degree of the magnetic field to reduce the generation of harmonics, thereby improving the operating performance of the motor. In addition, the magnetic poles are formed by mixing the magnetic steel and the high-permeability magnet according to a preset thickness ratio, wherein the permanent magnet material can be used for the magnet steel, and permanent magnet or soft magnet material can be used for the high-permeability magnet. Compared with the overall use of permanent magnet materials, it not only reduces the amount of permanent magnets, but also realizes the effect of optimizing the magnetic poles. In addition, the rotor of the axial field motor adopts a structure in which two rotor disks are superimposed in the axial direction, which provides better conditions for magnetization, that is, each of the rotor disks is magnetized first, and then the two rotor disks are superimposed in the axial direction to form the axial field motor rotor. Compared with the prior art of magnetizing first, the interaction between the magnets is avoided and the difficulty of transfer to the rotor bracket is increased. Furthermore, the magnetic poles are built into the rotor disk, which solves the defect of limiting the application range caused by the surface mount method in the prior art.

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Description of drawings

Fig. 1 is a structural schematic diagram of the first embodiment of the axial field motor rotor of the present invention;

Fig. 2 is a schematic structural view of the first embodiment of the magnetic pole plate of the present invention;

Fig. 3 is a structural schematic diagram of the first embodiment of the magnetic pole strip according to the present invention;

Fig. 4 is a schematic structural view of the first embodiment of the rotor bracket of the present invention;

Fig. 5 is a schematic structural view of the second embodiment of the axial field motor rotor of the present invention;

Fig. 6 is a schematic structural view of the second embodiment of the magnetic pole plate of the present invention;

Fig. 7 is a schematic structural view of the second embodiment of the rotor bracket of the present invention;

Fig. 8 is a structural schematic diagram of the third embodiment of the axial field motor rotor of the present invention;

Fig. 9 is a schematic structural view of the third embodiment of the magnetic pole plate of the present invention;

Fig. 10 is a schematic structural view of the third embodiment of the rotor bracket of the present invention;

Fig. 11 is a flow chart of the method for magnetizing the rotor of an axial field motor according to the present invention;

Figure 12 is a comparison diagram of magnetic density waveforms.

In the figure: 100 rotor disk, 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-permeability magnet, 1213 magnetic pole step, A magnetic pole, B magnetic pole step.

Detailed ways

The following description serves to disclose the present invention to enable those skilled in the art to carry out the present invention. The preferred embodiments described below are only examples, and those skilled in the art can devise other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents and other technical solutions without departing from the spirit and scope of the present invention.

As shown in FIG. 1 , FIG. 5 and FIG. 8 , the rotor disk 100 includes a rotor bracket 110 and a plurality of magnetic pole plates 120 , a plurality of magnetic pole plates 120 are built into the rotor bracket 110 along the circumferential direction, and both axial sides of the magnetic pole plates 120 are exposed by the rotor bracket 110 , and the magnetic pole plates 120 are formed by mixing magnetic steel 1211 and high magnetic permeability 1212 according to a preset ratio, and the thickness of the magnetic steel 1211 of each magnetic pole plate 120 is from The center of the magnetic pole plate 120 decreases gradually to both sides in the circumferential direction. .

The rotor of an axial field motor can be formed by stacking one rotor disk 100 or two rotor disks 100 in the axial direction. When a single rotor disk 100 forms a rotor, each of the magnetic pole plates 120 on the rotor disk 100 forms a magnetic pole A respectively. When the two rotor disks 100 are superimposed in the axial direction to form a rotor, the magnetic pole plates 120 of the two rotor disks 100 correspond one-to-one to form a magnetic pole A, but whether it is an axial field motor rotor composed of a single rotor disk 100 or a double rotor disk 100, the proportion of the magnetic steel 1211 in the middle part of each magnetic pole A is the highest, and the proportion of the magnetic steel on both sides of the circumferential direction of the magnetic pole A gradually decreases. , to reduce the generation of harmonics, thereby improving the performance of the motor. In addition, 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 magnet 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 magnetic material. Compared with the overall use of permanent magnet materials, it not only reduces the amount of permanent magnets used, but also achieves the effect of magnetic pole optimization. In addition, the rotor of the axial field motor adopts a structure in which two rotor disks 100 are superimposed in the axial direction, which provides better conditions for magnetization, that is, first magnetizes each of the rotor disks 100, and then superimposes the two rotor disks 100 in the axial direction to form the rotor of the axial field motor. Compared with the prior art of magnetizing first, the interaction between the magnetic steels 1211 is avoided, which increases the difficulty of transfer to the rotor bracket 110. Furthermore, the magnetic poles A are built into the rotor disk 100, which solves the defect of limiting the application range caused by the surface mount method in the prior art.

The present invention also provides an axial field motor rotor. The axial field motor rotor includes one or two rotor disks 100 of the above-mentioned embodiments. When the number of the rotor disks 100 is two, the magnetic pole plates 120 of the two rotor disks 100 correspond one-to-one and form a magnetic pole A. Since the rotor of the axial field motor adopts the rotor disk 100 of the above-mentioned embodiment, the beneficial effects brought by the rotor disk 100 of the rotor of the axial field motor refer to the above-mentioned embodiment.

According to the different thickness ratios of the magnetic steel 1211 and the high magnetizer 1212, the shape of the spliced magnetic pole plate 120 is different, and the shape of the rotor bracket 110 used to fix the magnetic pole plate 120 is also different. The rotor of an axial field motor composed of double rotor disks 100 is taken as an example below, and three embodiments are introduced in detail.

first embodiment

As shown in FIGS. 1 to 3 , the magnetic pole plate 120 includes a plurality of circumferentially spliced magnetic pole strips 121 , and the magnetic pole strips 121 are formed by axially stacking the magnetic steel 1211 and the high magnetizer 1212 according to a preset thickness ratio. When a plurality of magnetic pole strips 121 are spliced to form the magnetic pole plate 120, the magnetic steel of the magnetic pole strip 121 in the middle has the highest proportion, and the proportion of the magnetic steel on both sides along the circumferential direction of the magnetic pole plate 120 gradually decreases, that is, the magnetic steel 1211 of the magnetic pole strip 121 on both sides of the magnetic pole plate 120 has the smallest proportion, thereby improving the sine degree of the magnetic field. In detail, referring to FIG. Compared with the existing scheme, the sine degree of the magnetic field is effectively increased to reduce the generation of harmonics, thereby improving the operating performance of the motor.

Wherein the magnetic pole plate 120 can be divided into several magnetic pole strips 121 according to the actual situation, the more the divided magnetic pole strips 121, the better the sine of the magnetic field.

As shown in FIG. 2 , in the structure of the magnetic pole plate 120 , the magnetic pole strip 121 located in the middle may not have the high magnetic permeability 1212 , that is, the magnetic steel 1211 is used as a whole.

As shown in Figure 2 and Figure 3, the shape of each described magnetic pole bar 121 that forms described magnetic pole plate 120 is all consistent, and is fan-shaped, and wherein the fan-shaped inner edge of described magnetic pole bar 121 is concave, and the fan-shaped outer edge of described magnetic pole bar 121 is convex, and the described magnetic pole plate 120 that a plurality of described magnetic pole bars 121 of the same shape are spliced together is also fan-shaped, and the fan-shaped inner edge of described magnetic pole plate 120 is concave, and the fan-shaped of described magnetic pole plate 120 The outer edge is convex.

Further, the plurality of magnetic pole strips 121 constituting the magnetic pole plate 120 have the same thickness and radial dimension respectively, so as to form the magnetic pole plate 120 with symmetrical structure and thinner structure.

As shown in FIG. 2 and FIG. 3 , both radial sides of the magnetic pole strip 121 respectively extend to form magnetic pole step portions 1213 for clamping the rotor bracket 110 , and each of the magnetic pole step portions 1213 has the same thickness, so that after a plurality of the magnetic pole strips 121 are spliced to form the magnetic pole plate 120 , a plurality of the magnetic pole step portions 1213 on the same radial side form a magnetic pole step B with a uniform thickness.

Specifically, the axial dimension of the magnetic pole step portion 1213 is smaller than the axial dimension of the magnetic pole bar 121 , and it is flush with the side of the magnetic pole bar 121 where the magnetic steel 1211 is disposed, as shown in FIG. 3 . The magnetic pole step 1213 can be integrally formed with the magnetic pole bar 121, and its material is determined by the material of the connecting part between the magnetic pole bar 121 and the magnetic pole step part 1213. When the material of the connecting part of the magnetic pole bar 121 and the magnetic pole step portion 1213 is divided into high-permeability material 1212 and magnetic steel 1211 from top to bottom, the material of the magnetic pole step portion 1213 is also high-permeability material 1212 and magnetic steel 1211 from top to bottom.

More specifically, since 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 plurality of magnetic pole step portions 1213 on the same side in the radial direction form a magnetic pole step B with a uniform thickness, refer to FIG. 2 .

As shown in Figure 1, Figure 2 and Figure 4, the rotor bracket 110 includes a bracket inner ring 111, a bracket outer ring 112 and several bracket rods 113 connecting the bracket inner ring 111 and the bracket outer ring 112, a magnetic pole plate 120 is arranged between two adjacent bracket rods 113, and the radial sides of the magnetic pole plate 120 are respectively clamped to the bracket inner ring 111 and the bracket outer ring 112 through the magnetic pole steps B.

With reference to Fig. 4, the support inner ring 111 and the support outer ring 112 are respectively provided with support steps 114 for clamping the magnetic pole steps 1213 on the inner sides. The axial dimensions of the plurality of support steps 114 are the same, so as to adapt to the installation of the magnetic pole steps B with the same axial dimension. Splicing forms the magnetic pole plate 120 .

The two radial sides of the magnetic pole plate 120 are engaged with the bracket inner ring 111 and the bracket outer ring 112 respectively through the magnetic pole step B, so that the magnetic pole plate 120 is flush with the axial sides of the rotor bracket 110 respectively, so as to ensure the advantage of the small axial dimension of the rotor disk 100 . Further, the radial dimension of the rotor disk 100 is much larger than the axial dimension of the rotor disk 100 .

Referring to FIG. 1 , the two corresponding magnetic pole plates 120 are laminated with the magnetic steel 1211 built in to form the magnetic pole A, and the high-permeability magnet 1212 is exposed on both sides of the magnetic pole A in the axial direction. 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 cooperate with the stator. For example, it is applied to a single-rotor double-stator axial field motor, and the two stators are coaxial and maintained on both sides of the rotor with an air gap, so that the two sides exposed in the thickness direction of the magnetic pole A interact with the two stators respectively.

In summary, the magnetic pole step portions 1213 of the plurality of magnetic pole strips 121 that make up the magnetic pole plate 120 have the same thickness, because the plurality of magnetic pole step portions 1213 on the same side in the radial direction form a magnetic pole step B with the same thickness, and the opposite inner side of the bracket inner ring 111 and the bracket outer ring 112 are respectively provided with bracket step portions 114 for clamping the magnetic pole step portion 1213. The axial dimensions of the plurality of bracket step portions 114 are consistent to suit Equipped with magnetic pole steps B with consistent axial dimensions, which reduces the difficulty of processing and ensures the stability of the structure.

second embodiment

As shown in FIGS. 5 to 7 , the second embodiment of the axial field motor rotor is different from the first embodiment in that the radial dimension of the high-permeability magnet 1212 is smaller than the radial dimension of the magnet steel 1211, and the high-permeability magnet 1212 is located in the middle of the magnet steel 1211, so that the parts of the magnet steel 1211 beyond the radial sides of the high-permeability magnet 1212 form a magnetic pole step 1213, so that after a plurality of the magnetic pole strips 121 are spliced to form the magnetic pole plate 120 The plurality of magnetic pole step portions 1213 on the same side in the radial direction form a magnetic pole step B, and the thickness of the magnetic pole step B gradually decreases along the circumferential direction from the middle to both sides.

It can be seen that the magnetic steel 1211 determines the thickness of the magnetic pole step B, and the thickness of the two is consistent. Referring to FIG. 7 , the support inner ring 111 and the support outer ring 112 are respectively provided with support step parts 114 for clamping the magnetic pole step part 1213 , wherein the sum of the thicknesses of the clamped magnetic pole step part 1213 and the support step part 114 is equal to the thickness of the rotor support 110 . Two axial sides of the rotor support 110 are flush or slightly protruded, so that the thickness of the magnetic pole plate 120 is greater than or equal to the axial dimension of the rotor support 110 .

Since the thickness of each pole step portion 1213 constituting the magnetic pole plate 120 is different, the thickness of the bracket step portion 114 on the bracket inner ring 111 and the bracket outer ring 112 is also different. Referring to FIG. 6 , the thickness of the magnetic pole step B gradually decreases along the circumferential direction from the middle to both sides. Correspondingly, the bracket step portion 114 gradually increases along the circumferential direction from the middle to both sides, so as to ensure that the magnetic pole plates 120 are flush with or slightly protrude from both sides of the rotor bracket 110 in the axial direction.

As shown in FIG. 5 , when the two rotor disks 100 are superimposed in the axial direction, the corresponding two magnetic pole plates 120 are superimposed with the magnetic steel 1211 built in 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 pole plate 120 , the magnetic pole strip 121 in the middle may not have the high-permeability magnet 1212 , but only have the magnetic steel 1211 , which can be adjusted in proportion according to design requirements.

third embodiment

As shown in FIGS. 8 to 10 , the third embodiment of the axial field motor rotor differs from the second embodiment in that the radial dimension of the high-permeability magnet 1212 is larger than the radial dimension of the magnet steel 1211 , and the magnet steel 1211 is located in the middle of the high-permeability magnet 1212 , so that the parts of the high-permeability magnet 1212 beyond the radial sides of the magnet steel 1211 form a magnetic pole step 1213 , so that a plurality of the magnetic pole strips 121 are spliced to form the magnetic pole plate 12 After 0, the plurality of magnetic pole step portions 1213 on the same side in the radial direction form a magnetic pole step B, and the thickness of the magnetic pole step B gradually increases along the circumferential direction from the middle to both sides.

It can be seen that the high magnetizer 1212 determines the thickness of the magnetic pole step B, and the thickness of the two is consistent. Referring to FIG. 10 , the support inner ring 111 and the support outer ring 112 are respectively provided with support step parts 114 for clamping the magnetic pole step part 1213, wherein the sum of the thicknesses of the clamped magnetic pole step part 1213 and the support step part 114 is equal to the thickness of the rotor support 110, so that after the magnetic pole strip 121 is clamped on the support inner ring 111 and the support outer ring 112, the magnetic pole strips 121 are respectively The pole plate 120 is flush with or protrudes slightly on both axial sides of the rotor support 110 , so that the thickness of the magnetic pole plate 120 is greater than or equal to the axial dimension of the rotor support 110 .

Since the thickness of each pole step portion 1213 constituting the magnetic pole plate 120 is different, the thickness of the bracket step portion 114 on the bracket inner ring 111 and the bracket outer ring 112 is also different. Referring to FIG. 10 , the thickness of the magnetic pole step B gradually increases along the circumferential direction from the middle to both sides. Correspondingly, the bracket step portion 114 gradually decreases along the circumferential direction from the middle to both sides, so as to ensure that the magnetic pole plates 120 are flush with or slightly protrude from both sides of the rotor bracket 110 in the axial direction.

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 to form the magnetic pole A with the high-permeability magnet 1212 built in, and the magnetic steel 1211 is exposed on both sides of the magnetic pole A in the axial direction.

As shown in Figures 1 to 8, the manufacturing method of the axial field motor rotor includes:

S100, provide two unmagnetized rotor disks 100, the rotor disk 100 includes a rotor bracket 110 and a plurality of magnetic pole plates 120, the plurality of magnetic pole plates 120 are built into the rotor bracket 110 along the circumferential direction, and both axial sides of the magnetic pole plates 120 are exposed by the rotor bracket 110, and the magnetic pole plates 120 are formed by mixing unmagnetized magnetic steel 1211 and high magnetizer 1212 according to a preset ratio;

S200, placing the unmagnetized rotor disk 100 in a magnetizer for overall magnetization; S300, stacking the two magnetized rotor disks 100 in the axial direction, wherein the magnetic pole plates 120 of the two rotor disks 100 correspond one by one to form a magnetic pole A, the thickness of the magnetic steel 1211 of each magnetic pole A gradually decreases from the middle of the magnetic pole A to both sides in the circumferential direction, and the magnetization 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 stacking the magnetic steel 1211 and the high magnetic permeability body 1212 according to a preset ratio in the axial direction. Furthermore, in the step S100 , multiple groups of the magnetic pole strips 121 are clipped onto the rotor support 110 one by one, so that each group of the 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 two rotor disks 100 can be magnetized one by one by the same magnetizing jig, so as to realize the recycling of the magnetizing jigs, reduce the use cost of the magnetizing equipment, and correspondingly improve the magnetization efficiency. The magnetization direction of the magnetic pole A is along the axial direction, and the magnetization directions of two adjacent magnetic poles A are opposite.

The manufacturing method is to first mix the magnetic steel and the magnetic pole strips 121 of the high-permeability material and clamp them on the rotor bracket 110, and form a rotor disk 100 with a plurality of magnetic pole plates 120 that is not magnetized, and then magnetize the two rotor disks 100 one by one. The magnetic direction is opposite. Compared with the prior art of magnetizing first, avoiding the interaction between the magnets increases the difficulty of transfer to the rotor bracket 110 . It can be seen that the above magnetizing method effectively reduces the difficulty of assembly and improves the efficiency of assembly, manufacturing and molding.

The above-described embodiments are only used to illustrate the technical ideas and characteristics of the present invention. The purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. The scope of patent application of the present invention cannot be limited only by this embodiment. That is, all equivalent changes or modifications made according to the spirit disclosed in the present invention still fall within the scope of the patent of the present invention.

Claims

A rotor disk, characterized in that the rotor disk (100) comprises a rotor support (110) and a plurality of magnetic pole plates (120), the plurality of magnetic pole plates (120) are built into the rotor support (110) along the circumferential direction, and both axial sides of the magnetic pole plate (120) are exposed by the rotor support (110), and the magnetic pole plates (120) are formed by mixing magnetic steel (1211) and high magnetic permeability (1212) according to a preset ratio, And the thickness of the magnetic steel (1211) of each magnetic pole plate (120) decreases gradually from the middle of the magnetic pole plate (120) to both sides in the circumferential direction.
The rotor disk according to 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 stacking the magnetic steel (1211) and the high magnetic permeability (1212) in the axial direction according to a preset thickness ratio.
The rotor disk according to claim 2, characterized in that, radially two sides of the magnetic pole strip (121) respectively extend to form a magnetic pole step (1213) for clamping the rotor bracket (110), and each of the magnetic pole steps (1213) has the same thickness, so that after a plurality of the magnetic pole strips (121) are spliced to form the magnetic pole plate (120), the plurality of magnetic pole steps (1213) on the same radial side form a magnetic pole step (B) with a uniform thickness ).
The rotor disc according to claim 2, characterized in that, the radial dimension of the high magnetic permeability (1212) is smaller than the radial dimension of the magnetic steel (1211), and the high magnetic permeability (1212) is located in the middle of the magnetic steel (1211), so that the parts of the magnetic steel (1211) beyond the radial sides of the high magnetic permeability (1212) form a magnetic pole step (1213), so that when a plurality of the magnetic pole strips (121) are spliced to form the After the magnetic pole plate (120), a plurality of magnetic pole steps (1213) located on the same side in the radial direction form a magnetic pole step (B), and the thickness of the magnetic pole step (B) gradually decreases along the circumferential direction from the middle to both sides.
The rotor disc according to claim 2, characterized in that, the radial dimension of the high-permeability magnet (1212) is larger than the radial dimension of the magnet steel (1211), and the magnet steel (1211) is located in the middle of the high-permeability magnet (1212), so that the parts of the high-permeability magnet (1212) beyond the radial sides of the magnet steel (1211) form a magnetic pole step (1213), so that a plurality of the magnetic pole strips (121) are spliced to form the Behind the magnetic pole plate (120), a plurality of said magnetic pole step parts (1213) located on the same side in the radial direction form a magnetic pole step (B), and the thickness of said magnetic pole step (B) gradually increases along the circumferential direction from the middle to both sides.
The rotor disc according to claim 3, 4 or 5, wherein the rotor support (110) comprises a support inner ring (111), a support outer ring (112) and several 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 the radial sides of the magnetic pole plate (120) respectively pass through the magnetic pole steps ( B) Clipping the bracket inner ring (111) and the bracket outer ring (112).
The rotor disk according to claim 1, characterized in that, the thickness of the magnetic pole plate (120) is greater than or equal to the axial dimension of the rotor support (110).
The rotor disk according to claim 1, characterized in that, the radial dimension of the rotor disk (100) is much larger than the axial dimension of the rotor disk (100).
A rotor for an axial field motor, characterized in that it comprises one or two rotor disks (100) according to any one of claims 1 to 8, and when there are two rotor disks (100), the two rotor disks (100) are axially superimposed with the magnetic pole plates (120) in one-to-one correspondence.
A method for manufacturing an axial field motor rotor, comprising:

Two unmagnetized rotor disks (100) are provided. The rotor disk (100) includes a rotor bracket (110) and a plurality of magnetic pole plates (120). The plurality of magnetic pole plates (120) are built into the rotor bracket (110) along the circumferential direction, and both axial sides of the magnetic pole plates (120) are exposed by the rotor bracket (110). 2) Mixed according to the preset ratio;

placing the unmagnetized rotor disk (100) as a whole in a magnetizer for overall magnetization;

The two magnetized rotor disks (100) are stacked axially, wherein the magnetic pole plates (120) of the two rotor disks (100) correspond one-to-one to 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 both sides in the circumferential direction, and the magnetization directions of two adjacent magnetic poles (A) are opposite.