motor

Abstract

The application discloses a motor, which comprises a stator assembly, the stator assembly comprising a plurality of stator cores arranged along a circumferential direction, each of the stator cores being provided with a winding coil; and a rotor assembly, the rotor assembly comprising a first rotor, a second rotor and a third rotor, the first rotor and the second rotor being respectively arranged at two axial ends of the stator assembly, and the third rotor being arranged around the stator assembly, and an air gap being formed between the first rotor, the second rotor, the third rotor and the stator assembly. The motor according to the embodiment of the application has the advantages of improving the winding efficiency of the stator assembly, arranging the stator assembly as a split stator, facilitating replacement of parts of the stator assembly according to conditions, and saving cost.

Description

Technical Field

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

[0002] In the related art, the wound stator and wound rotor structures of the permanent magnet motor are integrated structures. This winding method has low winding efficiency, and when the integrated iron core is partially damaged, the entire iron core needs to be replaced. 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 having the advantages of improving the winding efficiency of the stator assembly, providing a split stator assembly, facilitating replacement of parts of the stator assembly as needed, and saving costs.

[0004] According to an embodiment of the present invention, a motor includes: a stator assembly, the stator assembly including a plurality of stator cores, the plurality of stator cores being arranged in a circumferential direction, and each of the stator cores being provided with a winding coil; a rotor assembly, the rotor assembly including a first rotor, a second rotor, and a third rotor, the first rotor and the second rotor being respectively provided at two axial ends of the stator assembly, the third rotor being enclosed within the stator assembly, and air gaps being formed between the first rotor, the second rotor, and the third rotor and the stator assembly respectively.

[0005] The motor according to the embodiment of the present invention has the advantages of improving the winding efficiency of the stator assembly, providing the stator assembly as a split stator, facilitating replacement of parts of the stator assembly according to the situation, and saving costs.

[0006] In addition, the motor according to the above embodiment of the present invention may also have the following additional technical features:

[0007] According to some embodiments of the present invention, the size of the air gap between each of the first rotor and the second rotor and the stator assembly is L1, and the size of the air gap between the third rotor and the stator assembly is L2, and L2 is greater than L1.

[0008] According to some embodiments of the present invention, each stator core includes: a stator tooth; a first axial tooth shoe and a second axial tooth shoe, wherein the first axial tooth shoe and the second axial tooth shoe are respectively connected to the axial ends of the stator tooth; and a radial tooth shoe, wherein the radial tooth shoe is connected to the side of the stator tooth.

[0009] In some embodiments, the first axial tooth shoe and the second axial tooth shoe are respectively detachably connected to the stator teeth, and the radial tooth shoe is integrally formed with the stator teeth.

[0010] In some embodiments, a groove is provided on a side of each of the first axial tooth shoe and the second axial tooth shoe facing away from the stator tooth.

[0011] In some embodiments, the stator teeth are trapezoidal teeth, and the opposite sides of two adjacent stator teeth are parallel to each other.

[0012] According to some embodiments of the present invention, the stator assembly further includes a stator bracket, and the plurality of stator cores are disposed on the stator bracket.

[0013] In some embodiments, the stator bracket is formed by an injection molding process using a plurality of stator cores equipped with the winding coils as inserts.

[0014] In some embodiments, annular mounting protrusions are provided at both axial ends of the stator bracket, and bearings are provided between the two mounting protrusions and the third rotor.

[0015] In some examples, ceramic sheets are provided between the first rotor and the bearing, and between the second rotor and the bearing.

[0016] According to some embodiments of the present invention, the first rotor includes a first bracket and a first iron core, the first bracket is arranged at one axial end of the stator assembly and fixedly connected to one axial end of the third rotor, and the first iron core is arranged on a side of the first bracket facing the stator assembly; the second rotor includes a second bracket and a second iron core, the second bracket is arranged at the other axial end of the stator assembly and fixedly connected to the other axial end of the third rotor, and the second iron core is arranged on a side of the second bracket facing the stator assembly.

[0017] In some embodiments, the first core and the second core are respectively formed as annular disc-shaped cores.

[0018] According to some embodiments of the present invention, the third rotor includes a plurality of rotor parts, and the plurality of rotor parts are arranged at intervals along a circumferential direction.

[0019] In some embodiments, each of the rotor parts includes: a third iron core, the length direction of the third iron core extending along the axial direction of the stator assembly; two magnetic tiles, the two magnetic tiles are arranged at intervals in the length direction of the third iron core, one of the two magnetic tiles is an N-pole magnetic tile and the other is an S-pole magnetic tile.

[0020] In some examples, the size of the air gap between the third rotor and the stator assembly is L2, and in each rotor portion, the distance between two magnetic tiles is L3, and L3 is greater than twice L2.

[0021] In some examples, the polarities of the aligned magnetic tiles of two adjacent rotor sections are opposite.

[0022] In some examples, a size of the air gap between the third rotor and the stator assembly is L2, a distance between the magnetic tiles of two adjacent rotor parts is L4, and L4 is greater than twice L2.

[0023] In some examples, the third rotor further includes: a third bracket, the third bracket is arranged in a sleeve arrangement with the stator assembly, a peripheral wall of the third bracket is provided with a plurality of mounting slots, and the plurality of rotor parts are matched with the plurality of mounting slots in a one-to-one correspondence.

[0024] In some examples, the plurality of rotor parts and the third bracket are connected together through an injection molding process.

[0025] According to some embodiments of the present invention, the winding coils of each phase of the motor are connected in parallel.

[0026] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0028] Figure 1 is a cross-sectional view of a motor according to an embodiment of the present invention.

[0029] Figure 2 yes Figure 1 A magnified view of some of the structures in .

[0030] Figure 3 3 is a schematic structural diagram of a stator assembly according to an embodiment of the present invention, wherein the stator assembly is formed by injection molding.

[0031] Figure 4 3 is a schematic structural diagram of a plurality of stator cores arranged in a circumferential direction according to an embodiment of the present invention.

[0032] Figure 5 2 is a schematic structural diagram of a stator core according to an embodiment of the present invention.

[0033] Figure 6 3 is a schematic structural diagram of a plurality of stator teeth arranged in a circumferential direction according to an embodiment of the present invention.

[0034] Figure 7 2 is a schematic structural diagram of a stator tooth according to an embodiment of the present invention.

[0035] Figure 8is a top view of a stator tooth according to an embodiment of the present invention.

[0036] Figure 9 2 is a schematic structural diagram of a first rotor or a second rotor according to an embodiment of the present invention.

[0037] Figure 10 3 is a schematic structural diagram of a third rotor according to an embodiment of the present invention, and the third rotor is formed by injection molding.

[0038] Figure 11 3 is a schematic structural diagram of a third rotor according to an embodiment of the present invention, in which the rotor portion is mounted on a third bracket.

[0039] Figure 12 2 is a schematic structural diagram of a third bracket according to an embodiment of the present invention.

[0040] Figure 13 3 is a schematic structural diagram of a plurality of rotor parts arranged in a circumferential direction according to an embodiment of the present invention.

[0041] Figure 14 FIG. 1 is a top view of a plurality of rotor parts arranged in a circumferential direction according to an embodiment of the present invention.

[0042] Reference numerals: Motor 1,

[0043] Stator assembly 10, stator core 100, first axial tooth shoe 110, second axial tooth shoe 120, stator teeth 130, connecting shaft 131, first connecting shaft 131a, second connecting shaft 131b, separator 132, radial tooth shoe 140, groove 150, stator bracket 200, mounting protrusion 210,

[0044] Winding coil 300,

[0045] The first rotor 400, the first bracket 410, the first iron core 420,

[0046] The second rotor 500, the second bracket 510, the second iron core 520,

[0047] The third rotor 600 , the rotor portion 610 , the third core 611 , the magnetic tile 612 , the third bracket 620 , the mounting groove 621 , the ceramic sheet 71 , and the bearing 72 . DETAILED DESCRIPTION

[0048] The following describes embodiments of the present invention in detail. Examples of the embodiments 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 intended only to explain the present invention and are not to be construed as limiting the present invention.

[0049] Hereinafter, a motor 1 according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0050] like Figures 1-14 As shown, the motor 1 according to the embodiment of the present invention includes a stator assembly 10 and a rotor assembly.

[0051] The stator assembly 10 includes a plurality of stator cores 100, which are arranged in a circumferential direction. Each stator core 100 is provided with a winding coil 300. By passing current through the winding coil 300, a rotating magnetic field can be formed around the stator core 100 to drive the rotor assembly to rotate. When the rotor assembly rotates, the motor 1 can output torque to the outside.

[0052] Specifically, providing multiple stator cores 100 facilitates separately providing a winding coil 300 on each stator core 100 to improve the winding efficiency of the stator core 100. Moreover, when the stator assembly 10 is partially damaged, the entire stator assembly 10 will not be damaged. There is no need to scrap the stator assembly 10, but only the corresponding stator core 100 needs to be scrapped, which is convenient for cost saving.

[0053] The rotor assembly includes a first rotor 400, a second rotor 500 and a third rotor 600. The first rotor 400 and the second rotor 500 are respectively arranged at the axial ends of the stator assembly 10 to generate magnetic flux in the axial direction of the stator assembly 10. The third rotor 600 is enclosed in the stator assembly 10 to generate magnetic flux in the radial direction of the stator assembly 10.

[0054] Specifically, by arranging the first rotor 400, the second rotor 500 and the third rotor 600, the first rotor 400 and the second rotor 500 are arranged at the axial ends of the stator assembly 10, and the third rotor 600 is arranged in the radial direction of the stator assembly 10, so as to make full use of the space of the motor 1 and form an axial and radial composite magnetic flux around the stator assembly 10 to increase the magnetic field of the rotor assembly, thereby increasing the magnetic flux of the winding chain of the motor 1 and increasing the output torque density of the motor 1.

[0055] Among them, air gaps are formed between the first rotor 400, the second rotor 500 and the third rotor 600 and the stator assembly 10 respectively, ensuring that the first rotor 400, the second rotor 500 and the third rotor 600 can rotate smoothly relative to the stator assembly 10, and preventing the first rotor 400, the second rotor 500 and the third rotor 600 from scratching the stator assembly 10 during rotation, thereby causing damage to the stator assembly 10 and the first rotor 400, the second rotor 500 and the third rotor 600.

[0056] In addition, since the winding coil 300 in the stator assembly 10 generates heat when energized, an air gap is provided between the first rotor 400, the second rotor 500, and the third rotor 600 and the stator assembly 10, so that the winding coil 300 can dissipate heat through the air gap and prevent the heat generated by the winding coil 300 from affecting the first rotor 400, the second rotor 500, and the third rotor 600.

[0057] Therefore, the motor 1 according to the embodiment of the present invention has the advantages of improving the winding efficiency of the stator assembly 10, setting the stator assembly 10 as a split stator, facilitating replacement of parts of the stator assembly 10 according to the situation, and saving costs.

[0058] The following describes a motor 1 according to a specific embodiment of the present invention with reference to the accompanying drawings.

[0059] like Figures 1-14 As shown, the motor 1 according to the embodiment of the present invention includes a stator assembly 10 and a rotor assembly.

[0060] In some embodiments of the present invention, the air gap between each of the first rotor 400 and the second rotor 500 and the stator assembly 10 has a size L1, and the air gap between the third rotor 600 and the stator assembly 10 has a size L2, which is greater than L1.

[0061] In some embodiments, sinusoidal magnetization technology can be used to magnetize the first rotor 400 and the second rotor 500. For example, N-pole magnetic flux can be generated on the first rotor 400 and S-pole magnetic flux can be generated on the second rotor 500. The magnetic fluxes generated by the first rotor 400 and the second rotor 500 are closed inside the first rotor 400 and the second rotor 500.

[0062] The magnetic paths of the first rotor 400 and the second rotor 500 are relatively short, and the first rotor 400 and the second rotor 500 are disposed at axial ends of the stator assembly 10. The third rotor 600 is disposed within the stator assembly 10, so that L2 is greater than L1. This reduces magnetic flux leakage generated by the third rotor 600. Specifically, if L2 is less than L1, the magnetic poles on the third rotor 600 will form closed magnetic flux lines with the stator assembly, resulting in magnetic flux leakage.

[0063] In some embodiments of the present invention, each stator core 100 includes a stator tooth 130, a first axial tooth shoe 110, and a second axial tooth shoe 120. The first axial tooth shoe 110 and the second axial tooth shoe 120 are respectively connected to the axial ends of the stator tooth 130 to fix the position of the winding coil 300 in the axial direction of the stator core 100 to prevent the winding coil 300 from falling off the stator core 100.

[0064] Each stator core 100 further includes a radial tooth shoe 140 connected to the side of the stator tooth 130 to define the position of the winding coil 300 on the stator tooth 130 in the radial direction of the stator core 100, further preventing the winding coil 300 from falling off the stator core 100. Multiple radial tooth shoes 140 are disposed around the third rotor 600 to enclose the third rotor 600 within the stator assembly 10.

[0065] In some optional embodiments of the present invention, the first and second axial tooth shoes 110, 120 are each detachably connected to the stator teeth 130. This facilitates the placement of the winding coils 300 on the stator teeth 130 using an automated winding process after the first and second axial tooth shoes 110, 120 are removed from the stator teeth 130. This process is simple and mature, offers high winding efficiency, and neatly arranges the wires, thereby improving the effective slot fill rate of the stator core 100. After winding is completed, the first and second axial tooth shoes 110, 120 can be reinstalled on the stator teeth 130 to define the position of the winding coils 300 on the stator teeth 130.

[0066] Furthermore, the radial tooth shoe 140 is integrally formed with the stator tooth 130. Specifically, because the radial tooth shoe 140 is connected to the side of the stator tooth 130, the radial tooth shoe 140 does not affect the automatic winding process. Therefore, the integral design of the radial tooth shoe 140 and the stator tooth 130 reduces the complexity of the parts and saves costs.

[0067] like Figure 5 、 Figure 6 As shown, in some embodiments, two winding coils 300 may be set on each stator core 100, and the stator tooth 130 includes a connecting shaft 131 and a separator 132, the connecting shaft 131 extends along a first direction, and the separator 132 extends along a second direction, and the separator 132 is arranged in the middle of the connecting shaft 131 to separate the connecting shaft 131 into a first connecting shaft 131a and a second connecting shaft 131b, wherein the first direction is perpendicular to the second direction.

[0068] Winding coils 300 can be respectively set on the first connecting shaft 131a and the second connecting shaft 131b. Specifically, when an automated winding process is adopted to wind the first connecting shaft 131a and the second connecting shaft 131b, the winding can be performed on the first connecting shaft 131a from the end of the first connecting shaft 131a away from the partition 132, and the winding can be performed on the second connecting shaft 131b from the end of the second connecting shaft 131b away from the partition 132. This process is simple and mature, has high winding efficiency, and neatly arranges the wires, which is convenient for improving the effective slot fill rate of the stator core 100.

[0069] The radial tooth boot 140 is arranged on one side of the partition 132 in the second direction, and the radial tooth boot 140 extends along the first direction to limit the position of the winding coil 300 on the first connecting shaft 131a and the winding coil 300 on the second connecting shaft 131b, thereby preventing the winding coil 300 from falling off the first connecting shaft 131a or the second connecting shaft 131b.

[0070] After the winding coil 300 is wound on the first connecting shaft 131a, the first axial tooth boot 110 can be set at the end of the first connecting shaft 131a away from the partition 132 to limit the position of the winding coil 300 on the first connecting shaft 131a. That is, the winding coil 300 on the first connecting shaft 131a is sleeved on the first connecting shaft 131a, the partition 132 and the first axial tooth boot 110 are located at both ends of the winding coil 300 in the first direction, and the radial tooth boot 140 is located on one side of the winding coil 300 in the second direction, so as to work together to fix the position of the winding coil 300.

[0071] After the winding coil 300 is wound on the second connecting shaft 131b, the second axial tooth boot 120 can be set at the end of the second connecting shaft 131b away from the partition 132 to limit the position of the winding coil 300 on the second connecting shaft 131b. That is, the winding coil 300 on the second connecting shaft 131b is sleeved on the second connecting shaft 131b, the partition 132 and the second axial tooth boot 120 are located at both ends of the winding coil 300 in the first direction, and the radial tooth boot 140 is located on one side of the winding coil 300 in the second direction, so as to work together to fix the position of the winding coil 300.

[0072] In some embodiments, one of the first axial tooth shoe 110 and the stator tooth 130 is provided with a first plug-in portion and the other is provided with a first socket that cooperates with the first plug-in portion. Through the cooperation of the first plug-in portion and the first socket, the first axial tooth shoe 110 can be detachably installed on the stator tooth 130, thereby facilitating the installation or disassembly of the winding coil 300.

[0073] Specifically, when the winding coil 300 needs to be installed on the stator tooth 130, the first plug-in portion and the first socket can be disengaged, and the first axial tooth shoe 110 can be removed from the stator tooth 130 to facilitate the use of an automated winding process to install the winding coil 300 on the stator tooth 130.

[0074] After the winding coil 300 is installed, the first plug-in portion and the first socket can be matched to install the first axial tooth shoe 110 on the stator tooth 130. The first axial tooth shoe 110 can limit the position of the winding coil 300 on the stator tooth 130 to prevent the winding coil 300 from falling off the stator tooth 130.

[0075] Similarly, one of the second axial tooth shoe 120 and the stator tooth 130 is provided with a second plug-in portion and the other is provided with a second socket that cooperates with the second plug-in portion. Through the cooperation of the second plug-in portion and the second socket, the second axial tooth shoe 110 can be detachably installed on the stator tooth 130, thereby facilitating the installation or disassembly of the winding coil 300.

[0076] Of course, the first axial tooth shoe 110 and the stator tooth 130 , and the second axial tooth shoe 120 and the stator tooth 130 may be detachably connected in other ways, such as by using a clamping structure or fasteners.

[0077] In some optional embodiments of the present invention, each of the first axial tooth shoe 110 and the second axial tooth shoe 120 is provided with a groove 150 on the side facing away from the stator tooth 130. The groove 150 can optimize the air gap magnetic flux waveform, thereby reducing the cogging torque of the motor 1.

[0078] Specifically, since there is an air gap between the first rotor 400, the second rotor 500 and the third rotor 600 and the stator assembly 10, a larger air gap magnetic field in the motor 1 will result in a larger cogging torque, so a groove 150 is provided on the first axial tooth shoe 110 and the second axial tooth shoe 120. The groove 150 can optimize the air gap magnetic flux waveform to improve the cogging torque and reduce the cogging torque of the motor 1.

[0079] What needs to be understood here is that cogging torque is a unique property of permanent magnet motors. When the permanent magnet motor is not powered, the positioning torque exhibited is a periodic wave. The cogging torque increases the fluctuation of the output torque of the permanent magnet motor and is a useless and harmful torque. By reducing the cogging torque of motor 1, the operation of motor 1 can be made smoother and the noise generated by motor 1 during operation can be reduced.

[0080] In some optional embodiments of the present invention, the stator teeth 130 are trapezoidal in a cross-section perpendicular to the axial direction to achieve a reasonable arrangement of the multiple stator cores 100 and facilitate maximizing the effective slot fill rate. The opposing sides of two adjacent stator teeth 130 are parallel to each other, facilitating the reasonable arrangement of the positions of the multiple stator teeth 130 and fully utilizing the stator slot space between two adjacent stator teeth 130 to maximize the slot fill rate.

[0081] Specifically, since the stator assembly 10 includes multiple stator cores 100, the multiple stator cores 100 are arranged along a circumferential direction, the stator teeth 130 are trapezoidal teeth, and the opposing sides of two adjacent stator teeth 130 are parallel to each other, so that the upper base of the trapezoid is placed close to the center of the circumference. In this way, the circumference formed by the multiple stator cores 100 is smaller, which facilitates full utilization of space and maximizes the effective slot fill rate, thereby forming a stronger rotating magnetic field and increasing the rotation rate of the first rotor 400, the second rotor 500 and the third rotor 600.

[0082] like Figure 6 、 Figure 7 As shown, in some embodiments, the side surfaces of two adjacent stator teeth 130 facing each other extend along a first direction, and the projection of the stator teeth 130 in a plane perpendicular to the first direction forms a trapezoidal shape, wherein the upper base and the lower base of the trapezoid are arc-shaped edges, thereby facilitating the arrangement of multiple stator teeth 130 along a circumferential direction. It should be understood here that the above-mentioned direction limitation is only for the convenience of describing the accompanying drawings and will not limit the actual setting position and direction of the motor 1.

[0083] In some embodiments of the present invention, the stator assembly 10 further includes a stator bracket 200 , and a plurality of stator cores 100 are disposed on the stator bracket 200 . The stator bracket 200 can support the plurality of stator cores 100 so that the plurality of stator cores 100 can be arranged along a circumferential direction to form the stator assembly 10 .

[0084] In some optional embodiments of the present invention, the stator bracket 200 is formed by an injection molding process using multiple stator cores 100 with winding coils 300 as inserts to fix the positions of the multiple stator cores 100 and the winding coils 300 to form a stator assembly 10.

[0085] Specifically, the stator core 100 equipped with the winding coil 300 can be placed on the injection mold, and then the injection molding material (such as epoxy resin injection molding material) can be poured into the injection mold to injection-mold the multiple stator cores 100 equipped with the winding coil 300 together to form the stator assembly 10. The slots between the multiple stator cores 100 can be filled, which facilitates reducing the wind wear loss of the stator assembly 10 when the rotor assembly rotates at high speed.

[0086] Among them, compared with gluing multiple stator cores 100 to the stator bracket 200 by glue, fastening them to the stator bracket 200 by winding carbon fiber filaments, or fastening the stator bracket 200 by an outer ring with a stainless steel ring, multiple stator cores 100 are injection molded together by epoxy resin pouring to form a stator assembly 10. This processing method has low cost and fast production cycle, which is convenient for reducing production costs and improving production efficiency.

[0087] Epoxy resin has good sealing properties and can protect the sub-core 100 from external corrosion. In addition, epoxy resin has good secondary turning performance and can be used as a processing position after dynamic balancing, facilitating subsequent processing of the stator assembly 10.

[0088] In some optional embodiments of the present invention, annular mounting protrusions 210 are provided at both axial ends of the stator bracket 200. The annular mounting protrusions 210 on the axial ends of the stator bracket 200 can cooperate with the first rotor 400 and the second rotor 500 to ensure the positioning and installation of the first rotor 400 and the second rotor 500 on the stator assembly 10.

[0089] Specifically, the center of the annular mounting protrusion 210 is in a straight line with the rotation center of the first rotor 400 and the second rotor 500, so that the first rotor 400 and the second rotor 500 can be installed at the axial ends of the stator assembly 10 while ensuring that the first rotor 400 and the second rotor 500 can rotate stably.

[0090] Bearings 72 are provided between the two mounting protrusions 210 and the third rotor 600. The bearings here can be sliding bearings or roller bearings. By providing the bearings 72, the third rotor 600 can be rotatably supported on the stator bracket 200, thereby preventing the third rotor 600 from scratching the stator assembly 10 during rotation, thereby preventing damage to the stator assembly 10 and the third rotor 600.

[0091] In addition, the motor 1 of the present invention may be a shaftless motor, and the bearing 72 here may be a relatively cheap copper bearing or graphite bearing, which is helpful to reduce costs.

[0092] like Figure 1 As shown, in this embodiment, the third rotor 600 is arranged in a circumference formed by the multiple stator cores 100. A bearing 72 is provided on the outside of the third rotor 600. The bearing 72 is located between the third rotor 600 and the multiple stator cores 100. On the one hand, it can support the third rotor 600 so that the third rotor 600 can rotate smoothly. On the other hand, it can separate the movement between the third rotor 600 and the stator assembly 10 to prevent the third rotor 600 from driving the stator assembly 10 to rotate during the rotation process.

[0093] In some specific embodiments of the present invention, ceramic sheets 71 are provided between the first rotor 400 and the bearing 72 and between the second rotor 500 and the bearing 72 to reduce the sliding friction between the first rotor 400 and the bearing 72 when the first rotor 400 rotates, and to reduce the sliding friction between the second rotor 500 and the bearing 72 when the second rotor 500 rotates, so that the first rotor 400 and the second rotor 500 can rotate smoothly relative to the stator assembly 10.

[0094] Specifically, the stator assembly 10 is sleeved on the outside of the third rotor 600, two bearings 72 are provided between the stator assembly 10 and the third rotor 600, the first rotor 400 and the second rotor 500 are arranged at both ends of the stator assembly 10 in the axial direction, a ceramic sheet 71 is provided between the first rotor 400 and one of the bearings 72, and a ceramic sheet 71 is provided between the second rotor 500 and the other of the bearings 72 to reduce the sliding friction between the first rotor 400 and the bearing 72 when the first rotor 400 rotates, and reduce the sliding friction between the second rotor 500 and the bearing 72 when the second rotor 500 rotates, so that the first rotor 400 and the second rotor 500 can rotate smoothly.

[0095] In some specific embodiments of the present invention, a plurality of stator cores 100 can be integrally molded into a stator assembly 10 using BMC injection molding. A mounting protrusion 210 is reserved at the end of the stator bracket 200 in the axial direction, so that the stator assembly 10 and the third rotor 600 are connected via a bearing 72. A ceramic sheet 71 is provided between the bearing 72 and the first rotor 400 and the second rotor 500.

[0096] like Figures 1-2 、 Figure 9 As shown, in some embodiments of the present invention, the first rotor 400 includes a first bracket 410 and a first core 420. The first core 420 is disposed on the side of the first bracket 410 facing the stator assembly 10. When the winding coils 300 in the stator assembly 10 are energized, a rotating magnetic field is generated around the winding coils 300, which in turn drives the first core 420 to rotate. The second rotor 500 includes a second bracket 510 and a second core 520. The second core 520 is disposed on the side of the second bracket 510 facing the stator assembly 10. When the winding coils 300 in the stator assembly 10 are energized, a rotating magnetic field is generated around the winding coils 300, which in turn drives the second core 520 to rotate.

[0097] Specifically, if Figure 1 As shown, in this embodiment, the first bracket 410 is provided at one axial end of the stator assembly 10, and the first bracket 410 is fixedly connected to one axial end of the third rotor 600 to install the first iron core 420 at one axial end of the third rotor 600. The second bracket 510 is provided at the other axial end of the stator assembly 10, and the second bracket 510 is fixedly connected to the other axial end of the third rotor 600 to install the second iron core 520 at the other axial end of the third rotor 600.

[0098] In some optional embodiments of the present invention, the first core 420 and the second core 520 are respectively formed as annular disc cores to ensure smooth rotation of the first core 420 and the second core 520.

[0099] Specifically, the first core 420 and the second core 520 form an annular disc-shaped core, which facilitates the use of sinusoidal magnetization technology on the annular disc-shaped core. The magnetic flux formed in this way is closed inside the first core 420 and the second core 520, so that the magnetic circuit formed by the first core 420 and the second core 520 is short, and the magnetic field on the surface of the first core 420 and the second core 520 is denser. In this way, the magnetic field on the surface of the first core 420 and the second core 520 can be completely sinusoidal, making the output of the motor 1 more stable and facilitating the reduction of noise, vibration, etc. generated when the motor 1 rotates.

[0100] In addition, the sinusoidal magnetization technology can be used to ensure that the first core 420 and the second core 520 have sufficient magnetic flux, without the need to set up additional permanent magnets or magnets on the first core 420 or the second core 520 to provide a magnetic circuit, making it convenient to design the first core 420 and the second core 520 to be thinner to meet different requirements for the first core 420 and the second core 520.

[0101] like Figure 9 As shown, in some embodiments, the first iron core 420 is formed as an annular disc-shaped iron core, and the first iron core 420 is installed on the outside of the first bracket 410. After the winding coil 300 is energized, the rotating magnetic field generated by the winding coil 300 can drive the first iron core 420 and the first bracket 410 to rotate, so that the motor 1 can output torque outward.

[0102] The second iron core 520 is formed as an annular disc-shaped iron core, and the second iron core 520 is installed on the outside of the second bracket 510. After the winding coil 300 is energized, the rotating magnetic field generated by the winding coil 300 can drive the second iron core 520 and the second bracket 510 to rotate, so that the motor 1 can output torque outward.

[0103] In some embodiments of the present invention, the third rotor 600 includes multiple rotor parts 610, which are arranged at intervals along a circumferential direction so that the multiple rotor parts 610 can adapt to the positions of the multiple stator cores 100. When the winding coils 300 on the stator core 100 are energized to generate a rotating magnetic field, the rotating magnetic field can smoothly drive the multiple rotor parts 610 to rotate synchronously, thereby driving the third rotor 600 to rotate.

[0104] In some optional embodiments of the present invention, each rotor portion 610 includes a third iron core 611 and two magnetic tiles 612. The length direction of the third iron core 611 extends along the axial direction of the stator assembly 10. The two magnetic tiles 612 are arranged at intervals in the length direction of the third iron core 611. One of the two magnetic tiles 612 is an N-pole magnetic tile 612 and the other is an S-pole magnetic tile 612, so as to form a closed magnetic field in the axial direction of the stator assembly 10. When the winding coil 300 on the stator core 100 generates a rotating magnetic field, the rotating magnetic field can drive the magnetic field formed by the two magnetic tiles 612 on a rotor portion 610 to rotate together, and then drive the two magnetic tiles 612 to rotate with the rotating magnetic field, driving multiple rotor portions 610 to rotate synchronously, realizing the rotation of the third rotor 600, so that the motor 1 can output torque outward.

[0105] In some specific embodiments of the present invention, the size of the air gap between the third rotor 600 and the stator assembly 10 is L2. In each rotor portion 610, the distance between the two magnetic tiles 612 is L3, and L3 is greater than twice L2, so as to increase the distance between the two magnetic tiles 612 on the third core 611, avoid the formation of closed magnetic lines of force between the two magnetic tiles 612, and reduce the magnetic leakage generated on a single rotor portion 610.

[0106] In some optional embodiments of the present invention, the polarities of the magnetic tiles 612 of two adjacent rotor parts 610 are opposite, specifically, as shown in FIG. Figure 11 As shown, multiple rotor parts 610 are arranged at intervals in the circumferential direction, and the magnetic poles of the two magnetic tiles 612 in each rotor part 610 are opposite. The magnetic poles of the two magnetic tiles 612 of two adjacent rotor parts 610 are opposite and arranged at intervals. This ensures that there is no magnetic conduction between the two adjacent rotor parts 610, avoids magnetic leakage between the two rotor parts 610, and is beneficial to increase the magnetic flux density of the radial magnetic flux, so as to increase the magnetic field of the rotor assembly, facilitate the improvement of the magnetic flux of the winding chain of the motor 1, and increase the output torque density of the motor 1.

[0107] In some optional embodiments of the present invention, the air gap between the third rotor 600 and the stator assembly 10 has an air gap dimension of L2, and the distance between the magnetic tiles 612 of two adjacent rotor sections 610 is L4. L4 is greater than twice L2 to increase the distance between the two rotor sections 610, prevent the formation of closed magnetic flux lines between the magnetic tiles 612 of different polarities on the two rotor sections 610, and reduce magnetic flux leakage generated by the third rotor 600. It should be noted that the magnetic tiles 612 of two adjacent rotor sections 610 refer to the distance between two aligned magnetic tiles 612 in the two adjacent rotor sections 610.

[0108] like Figures 11-13As shown, in some optional embodiments of the present invention, the third rotor 600 further includes a third bracket 620, which is arranged in a sleeve arrangement with the stator assembly 10. The peripheral wall of the third bracket 620 is provided with a plurality of mounting grooves 621, and the plurality of rotor parts 610 are matched with the plurality of mounting grooves 621 in a one-to-one correspondence so that the plurality of rotor parts 610 can be installed one by one into the mounting grooves 621. At the same time, such an arrangement facilitates increasing the rigidity of the third bracket 620, so that the third rotor 600 can rotate more stably.

[0109] Specifically, the third rotor 600 is sleeved on the outside of the stator assembly 10, that is, the third bracket 620 is sleeved on the outside of the stator assembly 10. In this example, a plurality of mounting grooves 621 are provided on the inner wall of the third bracket 620 and arranged along the circumference of the third bracket 620.

[0110] like Figure 12 As shown, in this embodiment, ten mounting grooves 621 are provided on the outer peripheral wall of the third bracket 620, and the ten rotor parts 610 are installed in the corresponding mounting grooves 621 on the peripheral wall of the third bracket 620. Each rotor part 610 includes a third iron core 611 and two magnetic tiles 612. The length direction of the third iron core 611 extends along the first direction, and the length directions of multiple mounting grooves 621 extend along the first direction to install the third iron core 611 in the corresponding mounting grooves 621. The two magnetic tiles 612 on each rotor part 610 are spaced apart on the outside of the third iron core 611 along the length direction of the third iron core 611. There is no magnetic conductivity between the rotor parts 610, thereby avoiding magnetic leakage between the rotor parts 610.

[0111] like Figures 10-13 As shown, in some optional embodiments of the present invention, multiple rotor parts 610 and the third bracket 620 are connected together through an injection molding process to fix the multiple rotor parts 610 on the third bracket 620 to form the third rotor 600.

[0112] Specifically, multiple rotor parts 610 and the third bracket 620 can be placed on an injection mold, and then injection molding material (such as epoxy resin injection molding material) can be poured into the injection mold to form a plastic body around the multiple rotor parts 610 and the third bracket 620, and the multiple rotor parts 610 can be fixed together to form the third rotor 600.

[0113] In some embodiments, the end surfaces of the third bracket 620 at both axial ends are respectively provided with a plurality of first connection holes arranged at intervals, and the first bracket 410 of the first rotor 400 and the second bracket 510 of the second rotor 500 are respectively provided with a plurality of second connection holes arranged at intervals. The first bracket 410 and the third bracket 620, as well as the second bracket 510 and the third bracket 620 are connected by fasteners passing through the first connection holes and the second connection holes, respectively, thereby fixing the first rotor 400, the second rotor 500 and the third rotor 600 together to ensure that the three can rotate synchronously.

[0114] In other embodiments, the end surfaces at both axial ends of the third bracket 620 are respectively provided with a plurality of spaced-apart snap-fitting portions, and the first bracket 410 of the first rotor 400 and the second bracket 510 of the second rotor 500 are respectively provided with a plurality of spaced-apart snap-fitting portions. The snap-fitting portions cooperate with each other to ensure that the first rotor 400, the second rotor 500 and the third rotor 600 can rotate synchronously.

[0115] In some embodiments of the present invention, each phase winding coil 300 of the motor 1 is connected in parallel. When one branch of the multiple parallel winding coils 300 is damaged or fails, the remaining branches can still work, thereby increasing the fault tolerance of the motor 1.

[0116] like Figure 4 As shown, in this embodiment, the stator assembly 10 includes twelve stator cores 100, and each stator core 100 is provided with two winding coils 300. That is, the stator assembly 10 is provided with twenty-four winding coils 300. According to the design of the three-phase motor 1, each phase of the motor 1 has eight winding coils 300. These eight winding coils 300 are not completely connected in series, and various parallel connection methods can be adopted according to the requirements of the motor 1. In this way, when one branch of the parallel winding coils 300 is damaged, the remaining branches can still work, thereby increasing the fault tolerance of the motor 1.

[0117] Other structures and operations of the motor 1 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0118] In the description of the application, it is necessary to understand that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application. In addition, the features defined as "first", "second" can be explicitly or implicitly include one or more of the features. In the description of the application, the meaning of "a plurality of" is two or more, unless otherwise specified. In the description of the application, the first feature "above" or "below" the second feature can include the first and second features in direct contact, or the first and second features not in direct contact but in contact through another feature between them.

[0119] In the description of the application, the first feature "above", "above" and "above" the second feature includes the first feature directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in height.

[0120] In the description of the application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0121] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0122] Although embodiments of the application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirit of the application, and the scope of the application is defined by the claims and their equivalents.

Claims

1. A motor, characterized in that: include: A stator assembly, the stator assembly comprising a plurality of stator cores, the plurality of stator cores being arranged along a circumferential direction, each of the stator cores being provided with a winding coil; a rotor assembly, the rotor assembly comprising a first rotor, a second rotor, and a third rotor, the first rotor and the second rotor being respectively disposed at two axial ends of the stator assembly, the third rotor being enclosed within the stator assembly, and air gaps being formed between the first rotor, the second rotor, and the third rotor and the stator assembly; The size of the air gap between each of the first rotor and the second rotor and the stator assembly is L1, and the size of the air gap between the third rotor and the stator assembly is L2, and L2 is larger than L1.

2. The motor according to claim 1, characterized in that Each of the stator cores comprises: stator teeth; a first axial tooth shoe and a second axial tooth shoe, wherein the first axial tooth shoe and the second axial tooth shoe are respectively connected to two axial ends of the stator tooth; A radial tooth shoe is connected to a side portion of the stator tooth.

3. The motor according to claim 2, characterized in that The first axial tooth shoe and the second axial tooth shoe are respectively detachably connected to the stator teeth, and the radial tooth shoe is integrally formed with the stator teeth.

4. The motor according to claim 2, characterized in that A groove is formed on a side of each of the first axial tooth shoe and the second axial tooth shoe facing away from the stator teeth.

5. The motor according to claim 2, characterized in that The stator teeth are trapezoidal teeth, and the opposite side surfaces of two adjacent stator teeth are parallel to each other.

6. The motor according to any one of claims 1, characterized in that The stator assembly further includes a stator bracket, and the plurality of stator cores are arranged on the stator bracket.

7. The motor according to claim 6, characterized in that The stator bracket is formed by an injection molding process using a plurality of stator cores equipped with the winding coils as inserts.

8. The motor according to claim 6, characterized in that Both axial ends of the stator bracket are provided with annular mounting protrusions, and bearings are provided between the two mounting protrusions and the third rotor.

9. The motor according to claim 8, characterized in that Ceramic sheets are provided between the first rotor and the bearing, and between the second rotor and the bearing.

10. The motor according to any one of claims 1, characterized in that The first rotor includes a first bracket and a first iron core, wherein the first bracket is provided at one axial end of the stator assembly and fixedly connected to one axial end of the third rotor, and the first iron core is provided at a side of the first bracket facing the stator assembly; The second rotor includes a second bracket and a second iron core. The second bracket is arranged at the other axial end of the stator assembly and is fixedly connected to the other axial end of the third rotor. The second iron core is arranged on a side of the second bracket facing the stator assembly.

11. The motor according to claim 10, characterized in that The first core and the second core are respectively formed into annular disc-shaped cores.

12. The motor according to any one of claims 1, characterized in that The third rotor includes a plurality of rotor parts, and the plurality of rotor parts are arranged at intervals along a circumferential direction.

13. The motor according to claim 12, characterized in that Each of the rotor parts comprises: a third iron core, wherein a length direction of the third iron core extends along the axial direction of the stator assembly; Two magnetic tiles are arranged at intervals in the length direction of the third core, one of the two magnetic tiles is an N-pole magnetic tile and the other is an S-pole magnetic tile.

14. The motor according to claim 13, characterized in that The size of the air gap between the third rotor and the stator assembly is L2. In each rotor part, the distance between two magnetic tiles is L3, and L3 is greater than twice L2.

15. The motor according to claim 13, characterized in that The polarities of the aligned magnetic tiles of two adjacent rotor parts are opposite.

16. The motor according to any one of claims 13 to 15, characterized in that The size of the air gap between the third rotor and the stator assembly is L2, and the distance between the magnetic tiles of two adjacent rotor parts is L4, and L4 is greater than twice of L2.

17. The motor according to any one of claims 13 to 15, characterized in that The third rotor further comprises: The third bracket is arranged in a sleeve arrangement with the stator assembly. The peripheral wall of the third bracket is provided with a plurality of mounting grooves, and the plurality of rotor parts are matched with the plurality of mounting grooves in a one-to-one correspondence.

18. The motor according to claim 17, characterized in that The plurality of rotor parts and the third bracket are connected together through an injection molding process.

19. The motor according to any one of claims 1, characterized in that The winding coils of each phase of the motor are connected in parallel.

Images