Motor

Abstract

The present invention discloses a motor, including a stator, a rotor, a rotating shaft, a first bearing and a second bearing, wherein the rotating shaft is fixed to the rotor, the first bearing and the second bearing are both sleeved outside the rotating shaft and arranged at intervals along the axial direction of the rotating shaft, the first bearing and the second bearing are both formed as magnetic suspension bearings, the magnetic suspension bearings include a first magnetic ring group and a second magnetic ring group, the first magnetic ring group is fixed to the stator and includes the first magnetic ring and the second magnetic ring, the second magnetic ring group is fixed to the rotating shaft and includes the third magnetic ring and the fourth magnetic ring, the first magnetic ring and the third magnetic ring are arranged in cooperation along the radial inner and outer sleeves of the rotating shaft, and the first magnetic ring and the third magnetic ring have the same surface magnetism relative to each other, the second magnetic ring and the fourth magnetic ring are arranged relative to each other along the axial direction of the rotating shaft, and the second magnetic ring and the fourth magnetic ring have the same surface magnetism relative to each other. According to the motor of the present invention, the loss is small, and it has good operating performance, vibration performance and sound quality.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a motor. Background Art

[0002] With the development of high-precision automation equipment, axial magnetic field motors have been used to solve the problems of mass production of low-cost stator windings and rotor assembly components. However, the motors have large losses during operation, and are accompanied by certain vibrations and noise, resulting in poor product quality. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a motor with low loss and good running performance, vibration performance and sound quality.

[0004] According to an embodiment of the present invention, the motor includes: a stator and a rotor; a rotating shaft, which is fixed to the rotor; a first bearing and a second bearing, wherein the first bearing and the second bearing are both sleeved outside the rotating shaft and spaced apart along the axial direction of the rotating shaft, the first bearing and the second bearing are both formed as magnetic suspension bearings, the magnetic suspension bearings include a first magnetic ring group and a second magnetic ring group, the first magnetic ring group is fixed to the stator and includes a first magnetic ring and a second magnetic ring, the second magnetic ring group is fixed to the rotating shaft and includes a third magnetic ring and a fourth magnetic ring, the first magnetic ring and the third magnetic ring are matched along the radial inner and outer outer arrangements of the rotating shaft, and the surfaces of the first magnetic ring and the third magnetic ring relative to each other have the same magnetic properties, the second magnetic ring and the fourth magnetic ring are relatively arranged along the axial direction of the rotating shaft, and the surfaces of the second magnetic ring and the fourth magnetic ring relative to each other have the same magnetic properties.

[0005] According to the motor of the embodiment of the present invention, the first bearing and the second bearing are both magnetic bearings, and the magnetic bearings include a first magnetic ring group and a second magnetic ring group, so that the suspension of the rotor is achieved through the cooperation of the first magnetic ring group and the second magnetic ring group, thereby improving the operating performance, vibration performance and sound quality of the motor. At the same time, during the operation of the rotor, the force is more balanced and the operation is stable, which effectively improves the operating stability of the motor.

[0006] In some embodiments, the first magnetic ring group includes a first bearing sleeve, which is disposed outside the rotating shaft and fixed to the stator, the first magnetic ring and the second magnetic ring are both fixed to the first bearing sleeve, the second magnetic ring group includes a second bearing sleeve, which is disposed outside the rotating shaft and fixed to the rotating shaft, the second bearing sleeve is arranged inside and outside the first bearing sleeve, and the third magnetic ring and the fourth magnetic ring are both fixed to the second bearing sleeve.

[0007] In some embodiments, the first bearing sleeve is formed with a first mounting groove and a second mounting groove, the first magnetic ring is limited to fit in the first mounting groove, the second magnetic ring is limited to fit in the second mounting groove, the second bearing sleeve is formed with a third mounting groove and a fourth mounting groove, the third magnetic ring is limited to fit in the second mounting groove, and the fourth magnetic ring is limited to fit in the fourth mounting groove.

[0008] In some embodiments, the first bearing sleeve is arranged outside the second bearing sleeve, the first mounting groove is formed on the inner circumferential wall of the first bearing sleeve, the second mounting groove is formed at one axial end of the first bearing sleeve, the second bearing sleeve includes a sleeve portion and a stop portion, the third mounting groove is formed on the outer circumferential wall of the sleeve portion, the stop portion is arranged at one axial end of the sleeve portion and extends radially outward along the rotating shaft to exceed the outer circumferential wall of the sleeve portion, and the fourth mounting groove is formed on the side of the stop portion facing the second magnetic ring.

[0009] In some embodiments, in the radial direction of the rotating shaft, the inner circumferential wall of the first magnetic ring is flush with the inner circumferential wall of the first bearing sleeve.

[0010] In some embodiments, in the radial direction of the rotating shaft, the outer circumferential wall of the second magnetic ring is flush with the outer circumferential wall of the second bearing sleeve.

[0011] In some embodiments, the motor further includes: a first end cover and a second end cover, the first end cover and the second end cover are fixed and arranged in sequence along the axial direction of the rotating shaft, the first end cover and the second end cover are both injection molded parts, and the first end cover is injection molded and fixed to the stator and the first magnetic ring group of the first bearing respectively, and the second end cover is injection molded and fixed to the first magnetic ring group of the second bearing.

[0012] In some embodiments, the electric machine is an axial flux electric machine.

[0013] In some embodiments, the rotor includes a rotor back iron and a plurality of permanent magnets, the rotor back iron is formed with a central through hole, the rotating shaft passes through the central through hole and is fixed to the rotor back iron, the plurality of permanent magnets are arranged at circumferential intervals along the central through hole, and the plurality of permanent magnets are all located on the axial side of the rotor back iron facing the stator.

[0014] In some embodiments, the rotor back iron has a center portion and an edge portion, the edge portion is arranged around the center portion, the center portion is arranged to protrude from the edge portion along the axial direction of the rotating shaft, the center through hole is formed in the center portion, and the permanent magnet is arranged in the edge portion.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 is a schematic diagram of a motor according to an embodiment of the present invention;

[0018] Figure 2 yes Figure 1 Another schematic diagram of the motor shown in;

[0019] Figure 3 yes Figure 1 A cross-sectional view of the motor shown in ;

[0020] Figure 4 yes Figure 3 A schematic diagram of fixing the first end cover, the stator and the first magnetic ring group of the first bearing shown in ;

[0021] Figure 5 yes Figure 4 A schematic diagram of the first end cover and the first magnetic ring group of the first bearing shown in ;

[0022] Figure 6 yes Figure 3 A schematic diagram of fixing the second end cover and the first magnetic ring group of the second bearing shown in ;

[0023] Figure 7 yes Figure 6 A schematic diagram of the second end cover and the first magnetic ring group of the second bearing shown in ;

[0024] Figure 8 yes Figure 3 A schematic diagram of the first magnetic ring group shown in ;

[0025] Fig. 9 yes Figure 8 A cross-sectional view of the first bearing sleeve shown in ;

[0026] Fig.10 yes Figure 3 A schematic diagram of the second magnetic ring group shown in ;

[0027] Fig.11 yes Fig.10 A cross-sectional view of the second magnetic ring group shown in ;

[0028] Fig.12 yes Fig.11 A cross-sectional view of the second bearing sleeve shown in ;

[0029] Fig.13 yes Figure 3 A schematic diagram of a stator shown in ;

[0030] Fig.14 yes Figure 3 Schematic diagram of the rotor shown in .

[0031] Reference numerals:

[0032] Motor 100,

[0033] Stator 1,

[0034] The rotor 2, the rotor back iron 21, the center portion 211, the center through hole 211a, the edge portion 212, the permanent magnet 22,

[0035] Rotating shaft 3, first bearing 4, second bearing 5,

[0036] Magnetic bearing 6,

[0037] The first magnetic ring group 61, the second magnetic ring group 62,

[0038] The first magnetic ring 611, the second magnetic ring 612, the first bearing sleeve 613, the first mounting groove 613a, the second mounting groove 613b, the third magnetic ring 621, the fourth magnetic ring 622, the second bearing sleeve 623, the third mounting groove 623a, the fourth mounting groove 623b, the shaft sleeve part 6231, the stopper part 6232,

[0039] A first end cover 7 and a second end cover 8. DETAILED DESCRIPTION

[0040] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0041] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific processes and examples of materials, but those of ordinary skill in the art can be aware of the applicability of other processes and / or the use of other materials.

[0042] Hereinafter, a motor 100 according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0043] like Figure 1-Figure 3 As shown, the motor 100 includes a stator 1, a rotor 2 and a rotating shaft 3. The stator 1 generates a rotating magnetic field and acts on the rotor 2 to form a magneto-electrodynamic rotating torque, so that the rotor 2 rotates, and the rotating shaft 3 is fixed to the rotor 2, thereby realizing the rotation of the rotating shaft 3.

[0044] The motor 100 also includes a first bearing 4 and a second bearing 5, which are both sleeved outside the rotating shaft 3, and the first bearing 4 and the second bearing 5 are spaced apart along the axial direction of the rotating shaft 3, so that the first bearing 4 and the second bearing 5 both support the rotating shaft 3, and at the same time facilitate reducing the friction resistance during the rotation of the rotating shaft 3, thereby ensuring the rotation accuracy of the rotating shaft 3.

[0045] Among them, the first bearing 4 and the second bearing 5 are both formed as magnetic bearings 6, and the first bearing 4 and the second bearing 5 can use magnetic force to suspend the rotor 2. During the operation of the motor 100, the rotor 2 in a suspended state has no mechanical contact with other components, and the rotor 2 can run at a higher speed, which is convenient for expanding the range of the operating speed of the rotor 2. At the same time, the mechanical wear is small, the energy consumption is low, the vibration is small, the noise is low, the service life is long, no lubrication is required, and there is no oil pollution, etc., which effectively improves the operation performance, vibration performance and sound quality of the motor 100.

[0046] like Figure 3 , Figure 4 , Figure 6 and Fig.11 As shown, the magnetic bearing 6 includes a first magnetic ring group 61 and a second magnetic ring group 62. The first magnetic ring group 61 is fixed to the stator 1, and the first magnetic ring group 61 is sleeved outside the rotating shaft 3. The first magnetic ring group 61 includes a first magnetic ring 611 and a second magnetic ring 612. The second magnetic ring group 62 is fixed to the rotating shaft 3, and the second magnetic ring group 62 is sleeved outside the rotating shaft 3. The second magnetic ring group 62 includes a third magnetic ring 621 and a fourth magnetic ring 622.

[0047] Among them, the first magnetic ring 611 and the third magnetic ring 621 are arranged in the radial inner and outer outer surfaces of the rotating shaft 3, and the surfaces of the first magnetic ring 611 and the third magnetic ring 621 relative to each other have the same magnetic properties. For example, when the first magnetic ring 611 is arranged outside the third magnetic ring 621, the inner circumferential wall of the first magnetic ring 611 and the outer circumferential wall of the third magnetic ring 621 have the same magnetic properties; when the third magnetic ring 621 is arranged outside the first magnetic ring 611, the inner circumferential wall of the third magnetic ring 621 and the outer circumferential wall of the first magnetic ring 611 have the same magnetic properties.

[0048] It can be seen that there is a magnetic repulsion force between the first magnetic ring 611 and the third magnetic ring 621, which makes it easy to ensure that there is always a certain radial interval between the first magnetic ring 611 and the third magnetic ring 621, so there is no mechanical contact between the first magnetic ring 611 and the third magnetic ring 621, and the first magnetic ring 611 is fixed to the stator 1, and the third magnetic ring 621 is fixed to the rotating shaft 3, so that the first magnetic ring 611 remains stationary relative to the stator 1, and the third magnetic ring 621 rotates with the rotating shaft 3, then the third magnetic ring 621 of the first bearing 4 and the third magnetic ring 621 of the second bearing 5 jointly support the rotating shaft 3, so that the rotating shaft 3 is suspended in the radial direction of the rotating shaft 3 under the magnetic force of the first magnetic ring 611.

[0049] The second magnetic ring 612 and the fourth magnetic ring 622 are arranged opposite to each other along the axial direction of the rotating shaft 3, and the surfaces of the second magnetic ring 612 and the fourth magnetic ring 622 relative to each other have the same magnetic properties, that is, the end face of the axial end of the second magnetic ring 612 opposite to the fourth magnetic ring 622 and the end face of the axial end of the fourth magnetic ring 622 opposite to the second magnetic ring 612 have the same magnetic properties.

[0050] It can be seen that there is a magnetic repulsion force between the second magnetic ring 612 and the fourth magnetic ring 622, which makes it easy for a certain axial spacing to always exist between the second magnetic ring 612 and the fourth magnetic ring 622 in the axial direction of the rotating shaft 3. There is no mechanical contact between the second magnetic ring 612 and the fourth magnetic ring 622, and the second magnetic ring 612 is fixed to the stator 1, and the fourth magnetic ring 622 is fixed to the rotating shaft 3, so that the second magnetic ring 612 remains stationary relative to the stator 1 and the fourth magnetic ring 622 rotates with the rotating shaft 3. The fourth magnetic ring 622 of the first bearing 4 and the fourth magnetic ring 622 of the second bearing 5 jointly limit the movement of the rotating shaft 3 in its axial direction, so that the force on the rotating shaft 3 is balanced, so that the rotating shaft 3 is suspended in the axial direction of the rotating shaft 3 under the magnetic force of the second magnetic ring 612.

[0051] Obviously, through the magnetic coordination of the first magnetic ring group 61 and the second magnetic ring group 62, the axial and radial suspension of the rotating shaft 3 is effectively achieved, and at the same time, it is convenient for the third magnetic ring 621 to rotate with the rotating shaft 3, and the force exerted by the first magnetic ring 611 on the third magnetic ring 621 is relatively constant in the entire circumference of the rotating shaft 3, so as to ensure the centered rotation of the rotating shaft 3, reduce the deviation between the actual center axis and the theoretical center axis of the rotating shaft 3, and improve the running stability of the motor 100, and it is convenient for the fourth magnetic ring 622 to rotate with the rotating shaft 3, and the force exerted by the second magnetic ring 612 on the fourth magnetic ring 622 is relatively constant in the entire circumference of the rotating shaft 3, so as to ensure that the second magnetic ring 612 of the first bearing 4 and the second magnetic ring 612 of the second bearing 5 always limit the axial movement of the rotating shaft 3, ensure the smooth rotation of the rotating shaft 3, and further improve the running stability of the motor 100.

[0052] It should be noted that the first magnetic ring 611 can be directly or indirectly fixed to the stator 1, the second magnetic ring 612 can be directly or indirectly fixed to the stator 1, the third magnetic ring 621 can be directly or indirectly fixed to the rotating shaft 3, and the fourth magnetic ring 622 can be directly or indirectly fixed to the rotating shaft 3.

[0053] According to the motor 100 of the embodiment of the present invention, the first bearing 4 and the second bearing 5 are both arranged as magnetic bearings 6, and the magnetic bearings 6 include a first magnetic ring group 61 and a second magnetic ring group 62, so that the suspension of the rotor 2 is achieved through the cooperation of the first magnetic ring group 61 and the second magnetic ring group 62, thereby improving the operating performance, vibration performance and sound quality of the motor 100. At the same time, during the operation of the rotor 2, the force is relatively balanced and the operation is stable, which effectively improves the operating stability of the motor 100.

[0054] In addition, in the present application, the first magnetic ring group 61 and the second magnetic ring group 62 do not require control. For example, the first magnetic ring 611, the second magnetic ring 612, the third magnetic ring 621 and the fourth magnetic ring 622 are magnetic parts themselves and can generate magnetic fields respectively without power supply, which is convenient for reducing the cost of the motor 100; compared with some technologies in which magnetic levitation bearings use electronic control to achieve suspension of components, the magnetic levitation bearings have high precision requirements and high costs.

[0055] The following description takes the first magnetic ring 611 as an example. After reading the following description, those skilled in the art can easily understand the arrangement of the second magnetic ring 612, the third magnetic ring 621 and the fourth magnetic ring 622: the first magnetic ring 611 is formed by magnetic powder injection molding, in which case the first magnetic ring 611 can be fixed by injection molding; or the first magnetic ring 611 is a permanent magnet (such as a sintered permanent magnet), in which case the first magnetic ring 611 can be fixed by gluing.

[0056] In some embodiments of the present invention, Figure 3 , Figure 4 and Figure 6 As shown, the magnetic bearing 6 also includes a first bearing sleeve 613, which is formed into an annular structure, and the first bearing sleeve 613 is sleeved outside the rotating shaft 3, and the first bearing sleeve 613 is fixed to the stator 1, and the first magnetic ring 611 and the second magnetic ring 612 are both fixed to the first bearing sleeve 613, then the first magnetic ring 611 and the second magnetic ring 612 can be indirectly fixed to the stator 1 through the first bearing sleeve 613, so as to simultaneously realize the fixation of the first magnetic ring 611 and the second magnetic ring 612, simplifying the fixing process of the first magnetic ring group 61 and the stator 1, and the first bearing sleeve 613 has a certain bearing capacity, which is convenient for realizing the stable setting of the first magnetic ring 611 and the second magnetic ring 612, which is beneficial to improving the bearing capacity of the first magnetic ring group 61.

[0057] like Figure 3 and Fig.11 As shown, the magnetic suspension bearing 6 also includes a second bearing sleeve 623, which is formed into an annular structure. The second bearing sleeve 623 is sleeved outside the rotating shaft 3, and the second bearing sleeve 623 is arranged inside and outside the first bearing sleeve 613, then the second bearing sleeve 623 is sleeved outside the first bearing sleeve 613, or the first bearing sleeve 613 is sleeved outside the second bearing sleeve 623, the second bearing sleeve 623 is fixed to the rotating shaft 3, the third magnetic ring 621 and the fourth magnetic ring 622 are both fixed to the second bearing sleeve 623, then the third magnetic ring 621 and the fourth magnetic ring 622 are indirectly fixed to the rotating shaft 3 through the second bearing sleeve 623, so as to simultaneously realize the fixation of the third magnetic ring 621 and the fourth magnetic ring 622, simplify the fixing process of the second magnetic ring group 62 and the rotating shaft 3, and the second bearing sleeve 623 has a certain bearing capacity, which is convenient for realizing the stable setting of the third magnetic ring 621 and the fourth magnetic ring 622, which is beneficial to improving the bearing capacity of the second magnetic ring group 62, and there is no need to change the structure of the rotating shaft 3.

[0058] Optionally, the first bearing sleeve 613 and the second bearing sleeve 623 are both made of magnetic conductive material, so as to ensure reliable magnetic cooperation between the first magnetic ring group 61 and the second magnetic ring group 62 .

[0059] In some embodiments of the present invention, Figure 4 , Figure 6 and Fig. 9 As shown, the first bearing sleeve 613 is formed with a first mounting groove 613a and a second mounting groove 613b, the first magnetic ring 611 is limited and matched with the first mounting groove 613a, and the second magnetic ring 612 is limited and matched with the second mounting groove 613b, which is convenient for realizing the limiting of the first magnetic ring 611 and the second magnetic ring 612, and is beneficial to improving the fixing efficiency of the first magnetic ring 611 and the first bearing sleeve 613, and improving the fixing efficiency of the second magnetic ring 612 and the first bearing sleeve 613. At the same time, it is convenient to reduce the height of the part of the first magnetic ring 611 protruding from the surface of the first bearing sleeve 613 and reduce the height of the part of the second magnetic ring 612 protruding from the surface of the first bearing sleeve 613, which is beneficial to avoid the interference of the first magnetic ring 611 and the second magnetic ring 612 with other components, and ensure the smooth assembly of the motor 100.

[0060] For example, in Figure 4 , Figure 6 and Fig. 9 In the example, the first mounting groove 613a limits the first magnetic ring 611 in both the radial and axial directions of the rotating shaft 3, and the second mounting groove 613b limits the second magnetic ring 612 in both the radial and axial directions of the rotating shaft 3.

[0061] like Fig.11 and Fig.12As shown, the second bearing sleeve 623 is formed with a third mounting groove 623a and a fourth mounting groove 623b, the third magnetic ring 621 is limited and matched with the third mounting groove 623a, and the fourth magnetic ring 622 is limited and matched with the fourth mounting groove 623b, which is convenient for realizing the limitation of the third magnetic ring 621 and the fourth magnetic ring 622, which is beneficial to improve the fixing efficiency of the third magnetic ring 621 and the second bearing sleeve 623, and improve the fixing efficiency of the fourth magnetic ring 622 and the second bearing sleeve 623, and at the same time, it is convenient to reduce the height of the part of the third magnetic ring 621 protruding from the surface of the second bearing sleeve 623 and reduce the height of the part of the fourth magnetic ring 622 protruding from the surface of the second bearing sleeve 623, which is beneficial to avoid the interference of the third magnetic ring 621 and the fourth magnetic ring 622 with other components, and ensure the smooth assembly of the motor 100.

[0062] For example, in Fig.11 and Fig.12 In the example, the third mounting groove 623a limits the third magnetic ring 621 in both the radial and axial directions of the rotating shaft 3, and the fourth mounting groove 623b limits the fourth magnetic ring 622 in both the radial and axial directions of the rotating shaft 3.

[0063] In some embodiments of the present invention, Figure 3 , Fig. 9 and Fig.12 As shown, the first bearing sleeve 613 is sleeved on the outside of the second bearing sleeve 623, the first mounting groove 613a is formed on the inner circumferential wall of the first bearing sleeve 613, and the first mounting groove 613a can be formed by a recessed portion of the inner circumferential wall of the first bearing sleeve 613, and the second mounting groove 613b is formed at one axial end of the first bearing sleeve 613, and the second mounting groove 613b can be formed by a recessed portion of the axial end surface of the first bearing sleeve 613.

[0064] The second bearing sleeve 623 includes a sleeve portion 6231 and a stop portion 6232. The third mounting groove 623a is formed on the outer peripheral wall of the sleeve portion 6231 so that the third magnetic ring 621 and the first magnetic ring 611 are opposite to each other in the radial direction of the rotating shaft 3 and generate magnetic repulsion. The stop portion 6232 is arranged at one axial end of the sleeve portion 6231, and the stop portion 6232 is located at the end of the sleeve portion 6231 corresponding to the second magnetic ring 612. The stop portion 6232 extends outwardly along the radial direction of the rotating shaft 3 to exceed the outer peripheral wall of the sleeve portion 6231. The fourth mounting groove 623b is formed on the side of the stop portion 6232 facing the second magnetic ring 612 so that the second magnetic ring 612 and the fourth magnetic ring 622 are opposite to each other in the axial direction of the rotating shaft 3 and generate magnetic repulsion.

[0065] For example, in Fig. 9In the example, the second mounting groove 613b passes through the inner circumferential wall of the first bearing sleeve 613. In the radial direction of the rotating shaft 3, the depth of the second mounting groove 613b is greater than the depth of the first mounting groove 613a, so as to ensure that the second magnetic ring 612 and the fourth magnetic ring 622 have a larger effective area in the axial direction of the rotating shaft 3, so as to ensure the axial restriction of the rotating shaft 3.

[0066] Of course, those skilled in the art can also easily understand the technical solution of the second bearing sleeve 623 being sleeved outside the first bearing sleeve 613 based on the above technical solution.

[0067] In some embodiments of the present invention, Figure 3 , Figure 4 and Figure 6 As shown, in the radial direction of the rotating shaft 3, the inner circumferential wall of the first magnetic ring 611 is flush with the inner circumferential wall of the first bearing sleeve 613. For example, the inner circumferential wall of the first magnetic ring 611 and the inner circumferential wall of the first bearing sleeve 613 are on the same cylindrical surface, which makes it convenient for the first magnetic ring group 61 to define an installation cavity with a relatively regular wall surface, ensuring that the second magnetic ring group 62 can be smoothly plugged into the installation cavity along the axial direction of the rotating shaft 3, which is beneficial to improving the assembly efficiency of the motor 100.

[0068] Of course, the present application is not limited to this; in other embodiments, the inner circumferential wall of the first magnetic ring 611 can also be located radially outside the inner circumferential wall of the first bearing sleeve 613.

[0069] In some embodiments of the present invention, Fig.11 and Fig.12 As shown, in the radial direction of the rotating shaft 3, the outer peripheral wall of the third magnetic ring 621 is flush with the outer peripheral wall of the second bearing sleeve 623. For example, the outer peripheral wall of the third magnetic ring 621 and the outer peripheral wall of the second bearing sleeve 623 are on the same cylindrical surface, which makes it convenient to make the outer peripheral wall of the second magnetic ring group 62 more regular, ensuring that the second magnetic ring group 62 can be smoothly inserted into the first magnetic ring group 61 along the axial direction of the rotating shaft 3, which is beneficial to improving the assembly efficiency of the motor 100.

[0070] Of course, the present application is not limited to this; in other embodiments, the outer peripheral wall of the third magnetic ring 621 can also be located radially inside the outer peripheral wall of the second bearing sleeve 623.

[0071] In some embodiments of the present invention, Figure 3 , Figure 4 and Figure 6 As shown, the motor 100 further includes a first end cover 7 and a second end cover 8, which are fixed and arranged in sequence along the axial direction of the rotating shaft 3, and are both injection molded parts.

[0072] Among them, the first end cover 7 is fixed to the stator 1 and the first magnetic ring group 61 of the first bearing 4 by injection molding respectively, so that the first end cover 7 is fixed to the stator 1 and the first magnetic ring group 61 of the first bearing 4 are fixed in the injection molding process of the first end cover 7, which is beneficial to simplify the production process of the motor 100, facilitate the mass production of the motor 100, and ensure that the first end cover 7 and the stator 1, the first end cover 7 and the corresponding first magnetic ring group 61 are reliably fixed, and at the same time facilitates the assembly of the first end cover 7, the stator 1 and the first bearing 4; the second end cover 8 and the first magnetic ring group 61 of the second bearing 5 are fixed by injection molding, so that the second end cover 8 and the first magnetic ring group 61 of the second bearing 5 are fixed in the injection molding process of the second end cover 8, which ensures that the second end cover 8 and the corresponding first magnetic ring group 61 are reliably fixed, and at the same time facilitates the assembly of the second end cover 8 and the second bearing 5.

[0073] It can be seen that the first magnetic ring group 61 of the first bearing 4 is indirectly fixed to the stator 1 through the first end cover 7 , and the first magnetic ring group 61 of the second bearing 5 is indirectly fixed to the stator 1 through the second end cover 8 and the first end cover 7 .

[0074] For example, in Figure 3 In the example, the first end cover 7 and the second end cover 8 jointly define an accommodating cavity, the stator 1 and the rotor 2 are both arranged in the accommodating cavity, the structure of the first bearing 4 is the same as the structure of the second bearing 5, the first magnetic ring group 61 of the first bearing 4 and the first magnetic ring group 61 of the second bearing 5 both include a first bearing sleeve 613, a first magnetic ring 611 and a second magnetic ring 612, the first magnetic ring 611 and the second magnetic ring 612 are both fixed to the first bearing sleeve 613, the first bearing sleeve 613 of the first bearing 4 is fixed to the first end cover 7 by injection molding, and the first bearing sleeve 613 of the second bearing 5 is fixed to the second end cover 8 by injection molding.

[0075] Optionally, the first end cover 7 and the second end cover 8 are both BMC (bulk molding compound) injection molded parts.

[0076] In some optional embodiments of the present invention, Figure 3 As shown, the motor 100 is an axial magnetic field motor 100. Compared with the radial magnetic field motor, the axial magnetic field motor 100 has the advantages of thin axial thickness, small spatial volume, light weight, high efficiency, etc. The power density of the axial magnetic field motor 100 is higher, so the axial magnetic field motor 100 uses less material. For example, the axial magnetic field motor 100 uses less copper, silicon steel and permanent magnet materials.

[0077] Compared with some technologies, the dual-stator 1 axial magnetic field motor 100 adopts a topological structure, and its axial size is generally that of the traditional radial magnetic field motor 100, which is convenient for adapting to the miniaturization design requirements of household appliances; while the dual-stator 1 axial magnetic field motor 100 usually adopts mechanical ball bearings, which causes the motor 100 to consume a large amount of power and is accompanied by certain vibration and noise. In this application, the first bearing 4 and the second bearing 5 are both set as magnetic suspension bearings 6, which can realize the suspension setting of the rotor 2, so as to reduce the friction loss of the motor 100 and reduce the vibration and noise of the motor 100.

[0078] In some embodiments, Figure 3 and Fig.14 As shown, the rotor 2 includes a rotor back iron 21 and a plurality of permanent magnets 22. The rotor back iron 21 is formed with a central through hole 211a. The rotating shaft 3 is passed through the central through hole 211a, and the rotating shaft 3 is fixed to the rotor back iron 21. The plurality of permanent magnets 22 are arranged at intervals along the circumference of the central through hole 211a, and the plurality of permanent magnets 22 are all located on the axial side of the rotor back iron 21 facing the stator 1, thereby saving the space occupied by the motor 100 in the axial direction of the rotating shaft 3 and further reducing the axial thickness of the motor 100.

[0079] Optionally, the rotating shaft 3 is transitionally matched with the central through hole 211 a , and the rotating shaft 3 and the rotor back iron 21 are fixed by welding (eg, laser welding) at the central through hole 211 a .

[0080] Optionally, the permanent magnet 22 is a sintered permanent magnet, and the permanent magnet 22 is glued to the rotor back iron 21 , or the permanent magnet 22 is formed on the rotor back iron 21 by magnetic powder die-casting.

[0081] It can be understood that the magnetic arrangement of the permanent magnets 22 can be specifically set according to actual needs; for example, the magnetic poles of multiple permanent magnets 22 can be N poles and S poles arranged in sequence along the axial direction of the rotating shaft 3, or multiple permanent magnets 22 can be arranged using the Halbach array. The Halbach array is well known to those skilled in the art and will not be described here.

[0082] In some embodiments, Fig.14 As shown, the rotor back iron 21 is generally formed into a disc-shaped structure, and the rotor back iron 21 has a central portion 211 and an edge portion 212, the edge portion 212 is arranged around the central portion 211, the central portion 211 is arranged to protrude from the edge portion 212 along the axial direction of the rotating shaft 3, the central through hole 211a is formed in the central portion 211, and the permanent magnet 22 is arranged in the edge portion 212. Therefore, the structural strength of the central portion 211 can be improved, and the rotor back iron 21 and the rotating shaft 3 can be reliably fixed.

[0083] For example, Figure 3As shown, the assembly process of the motor 100 is as follows: fix the rotating shaft 3 and the rotor 2, fix the first end cover 7 to the stator 1 and the first magnetic ring group 61 of the first bearing 4 by injection molding, and fix the second end cover 8 to the first magnetic ring group 61 of the second bearing 5 by injection molding; insert the fixed rotating shaft 3 and the rotor 2 into the first magnetic ring group 61 of the first bearing 4 by means of a fixture, and then install the second magnetic ring group 62 of the first bearing 4 to match the corresponding first magnetic ring group 61, and fix the second magnetic ring group 62 of the first bearing 4 and the second magnetic ring group 62 of the second bearing 5 to the rotating shaft 3 respectively (for example, the second magnetic ring group 62 is interference fit with the rotating shaft 3), and finally match the fixed second end cover 8 and the first magnetic ring group 61 of the second bearing 5 to the corresponding position, and fix the second end cover 8 to the first end cover 7, and match the first magnetic ring group 61 of the second bearing 5 with the corresponding second magnetic ring group 62.

[0084] Other structures and operations of the motor 100 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0085] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0086] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0087] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0088] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A motor, characterized in that: include: stator and rotor; a rotating shaft, the rotating shaft being fixed to the rotor; a first bearing and a second bearing, wherein the first bearing and the second bearing are both sleeved outside the rotating shaft and spaced apart along the axial direction of the rotating shaft, the first bearing and the second bearing are both formed as magnetic suspension bearings, the magnetic suspension bearings include a first magnetic ring group and a second magnetic ring group, the first magnetic ring group is fixed to the stator and includes a first magnetic ring and a second magnetic ring, the second magnetic ring group is fixed to the rotating shaft and includes a third magnetic ring and a fourth magnetic ring, The first magnetic ring and the third magnetic ring are arranged in a radial direction inside and outside the rotating shaft, and the surfaces of the first magnetic ring and the third magnetic ring facing each other have the same magnetic properties. The second magnetic ring and the fourth magnetic ring are arranged opposite to each other along the axial direction of the rotating shaft, and the surfaces of the second magnetic ring and the fourth magnetic ring facing each other have the same magnetic properties; The first magnetic ring group includes a first bearing sleeve, the first bearing sleeve is arranged outside the rotating shaft and fixed to the stator, and the first magnetic ring and the second magnetic ring are both fixed to the first bearing sleeve. The second magnetic ring group includes a second bearing sleeve, the second bearing sleeve is sleeved outside the rotating shaft and fixed to the rotating shaft, the second bearing sleeve is arranged inside and outside the first bearing sleeve to cooperate, and the third magnetic ring and the fourth magnetic ring are both fixed to the second bearing sleeve; The first bearing sleeve is formed with a first mounting groove and a second mounting groove, the first magnetic ring is limitedly matched with the first mounting groove, and the second magnetic ring is limitedly matched with the second mounting groove. The second bearing sleeve is formed with a third mounting groove and a fourth mounting groove, the third magnetic ring is limitedly matched with the second mounting groove, and the fourth magnetic ring is limitedly matched with the fourth mounting groove; The motor is an axial magnetic field motor, the rotor includes a rotor back iron and a plurality of permanent magnets, the rotor back iron is formed with a central through hole, the rotating shaft is passed through the central through hole and is fixed to the rotor back iron, the plurality of permanent magnets are arranged at intervals along the circumference of the central through hole, and the plurality of permanent magnets are all located on the axial side of the rotor back iron facing the stator.

2. The motor according to claim 1, characterized in that The first bearing sleeve is arranged outside the second bearing sleeve, the first mounting groove is formed on the inner peripheral wall of the first bearing sleeve, and the second mounting groove is formed on one axial end of the first bearing sleeve. The second bearing sleeve includes a shaft sleeve portion and a stop portion, the third mounting groove is formed on the outer peripheral wall of the shaft sleeve portion, the stop portion is arranged at one axial end of the shaft sleeve portion and extends radially outward along the rotating shaft to exceed the outer peripheral wall of the shaft sleeve portion, and the fourth mounting groove is formed on the side of the stop portion facing the second magnetic ring.

3. The motor according to claim 2, characterized in that In the radial direction of the rotating shaft, the inner circumferential wall of the first magnetic ring is flush with the inner circumferential wall of the first bearing sleeve.

4. The motor according to claim 2, characterized in that In the radial direction of the rotating shaft, the outer peripheral wall of the third magnetic ring is flush with the outer peripheral wall of the second bearing sleeve.

5. The motor according to claim 1, characterized in that Also includes: A first end cover and a second end cover, wherein the first end cover and the second end cover are fixed and arranged in sequence along the axial direction of the rotating shaft, the first end cover and the second end cover are both injection molded parts, and the first end cover is injection molded and fixed to the stator and the first magnetic ring group of the first bearing respectively, and the second end cover is injection molded and fixed to the first magnetic ring group of the second bearing.

6. The motor according to claim 1, characterized in that The rotor back iron has a center portion and an edge portion, the edge portion is arranged around the center portion, the center portion is arranged to protrude from the edge portion along the axial direction of the rotating shaft, the center through hole is formed in the center portion, and the permanent magnet is arranged at the edge portion.

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