Motor, vehicle and rotor assembly method

Abstract

The present disclosure relates to an assembly method of a motor, a vehicle and a rotor, wherein the motor includes a housing and a stator core, a stator winding and a rotor arranged in the housing, stator slots are respectively arranged on both end surfaces of the stator core, and the stator winding is arranged in the stator slots; rotors are respectively arranged at both ends of the stator core, and the rotor includes a back plate, a pressure plate and a sheath, and a soft magnetic composite element is fixed on the back plate; the pressure plate is installed on the back plate for fixing a number of magnetic steels, and each magnetic steel is an asymmetric structure with respect to the radial direction of the rotor; the sheath is arranged on the outer periphery of a plurality of magnetic steels. In this way, the magnetic steel is designed to be an asymmetric structure, and the outer ring of the magnetic steel and the inner ring of the magnetic steel are staggered at a certain angle in the circumferential direction, which can effectively reduce the cogging effect, thereby reducing the cogging torque and the motor torque pulsation, and improving the NVH performance of the motor. At the same time, adding a soft magnetic composite element in the rotor can reduce iron loss and eddy current loss.

Description

Technical Field

[0001] The present disclosure relates to the technical field of drive motors, and in particular to an assembly method of a motor, a vehicle, and a rotor. Background Art

[0002] Axial flux motors, also known as disc motors, are gaining more and more attention in the motor industry due to their compact axial dimensions, high electromechanical conversion efficiency, and high power and torque density. The rotor in an axial flux motor includes several magnetic steels. The strength and stability of the magnetic steel fixation will affect the running stability of the motor. How to improve the stability of the magnetic steel fixation has become a technical problem that needs to be solved urgently. Summary of the invention

[0003] In order to overcome the problems existing in the related art, the present disclosure provides an assembly method of a motor, a vehicle and a rotor.

[0004] According to a first aspect of an embodiment of the present disclosure, there is provided a motor, comprising:

[0005] case,

[0006] The stator core and the stator winding are arranged in the housing, the two end surfaces of the stator core are respectively provided with stator slots, and the stator winding is arranged in the stator slots;

[0007] The rotor is provided at both ends of the stator core, and the rotor comprises:

[0008] A back plate, on which a soft magnetic composite element is fixed;

[0009] A pressure plate, mounted on the back plate and used for fixing a plurality of magnetic steels, each of the magnetic steels being an asymmetric structure with respect to the radial direction of the rotor; and

[0010] The sheath is sleeved on the outer periphery of the plurality of magnetic steels.

[0011] Optionally, the magnetic steel has an inner arc, an outer arc, and a first bevel and a second bevel connecting the two ends of the inner arc and the outer arc, and the outer end of the first bevel and / or the second bevel is inclined in a clockwise direction or counterclockwise direction relative to the inner end.

[0012] Optionally, the central angle of the inner arc is , the central angle of the outer arc is ,in, Relative to The polar angle β is staggered in clockwise or counterclockwise direction.

[0013] Optionally, ,in, is the number of poles of the motor, is the pole arc coefficient of the magnetic steel.

[0014] Optionally, , where s is the number of slots in the stator core of the motor and N is a positive rational number.

[0015] Optionally, the back plate has a first platform and a second platform that are protrudingly arranged, the diameter of the first platform is greater than the diameter of the second platform, the height of the second platform is greater than the height of the first platform, the soft magnetic composite element is fixed on the first platform and is arranged in sequence in a circumferential direction around the second platform, and the top surface of the soft magnetic composite element is flush with the surface of the second platform.

[0016] Optionally, a plurality of convex ribs spaced apart along the circumferential direction are provided on the first platform, and the soft magnetic composite element has a positioning groove which cooperates with the convex ribs in a limiting manner.

[0017] Optionally, the soft magnetic composite element is a fan-shaped structure, and the positioning groove extends radially and is provided at a middle position of the fan-shaped structure.

[0018] Optionally, the contact surfaces of the soft magnetic composite element and the back plate and the surfaces between two adjacent soft magnetic composite elements are respectively bonded and fixed.

[0019] Optionally, the pressure plate has a main body and a plurality of spokes arranged in a radial disk, the spokes having a first end connected to the main body and a second end opposite to the first end, wherein the second end of the spoke is deflected clockwise or counterclockwise relative to the first end.

[0020] Optionally, the main body is fixed to the back plate, and the soft magnetic composite element and the two adjacent spokes together form a limiting space for accommodating the magnetic steel, and the outer ends of the two adjacent spokes form an opening, and the magnetic steel can be inserted into the limiting space from the opening, and the limiting space matches the shape of the magnetic steel.

[0021] Optionally, the back plate has a second platform and a third platform that are protrudingly arranged, the diameter of the third platform is smaller than the diameter of the second platform, the height of the third platform is greater than the height of the second platform, the pressure plate has a main body, and a plurality of spokes are arranged at intervals along the circumference of the main body. The main body is mounted on the third platform and is installed on the second platform through fasteners, and the surface of the main body is flush with the top surface of the third platform.

[0022] Optionally, the cross-section of the spoke is a T-shaped structure, and steps are provided on both sides of the magnetic steel, respectively, the step portions cooperate with the tooth grooves on one side of the T-shaped structure, and the surface of the magnetic steel is flush with the top surface of the pressure plate.

[0023] Optionally, one magnetic steel spans across two of the soft magnetic composite elements.

[0024] Optionally, the back plate has an overlapping edge located at the outer edge of the first platform, and the axial width of the sleeve is equal to the axial width of the overlapping edge.

[0025] According to a second aspect of an embodiment of the present disclosure, a vehicle is provided, comprising the above-mentioned motor.

[0026] According to a third aspect of an embodiment of the present disclosure, a method for assembling a rotor is provided. The rotor is the rotor mentioned in the above embodiment. The method for assembling a rotor comprises:

[0027] fixing the soft magnetic composite component on the back plate;

[0028] Fix the pressure plate to the back plate;

[0029] fixing a plurality of magnetic steels in sequence; and

[0030] The sheath is disposed on the outer circumference of the plurality of magnetic steels.

[0031] Optionally, the step of fixing the soft magnetic composite element on the back plate includes:

[0032] Align the positioning groove of the soft magnetic composite element with the convex rib on the back plate, and press and fix them in the axial direction;

[0033] A plurality of the soft magnetic composite components are fixed on the back plate in sequence.

[0034] Optionally, the step of sequentially fixing a plurality of magnetic steels includes:

[0035] Inserting the magnetic steel radially into the limiting space formed by two adjacent spokes of the pressing plate and the soft magnetic composite element, and bonding and fixing them;

[0036] Insert multiple magnetic steels into corresponding limiting spaces in sequence and fix them with glue.

[0037] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: In the motor provided by the present disclosure, the magnetic steel is designed as an asymmetric structure, and the outer ring of the magnetic steel and the inner ring of the magnetic steel are staggered at a certain angle in the circumferential direction, which can effectively reduce the cogging effect, thereby reducing the cogging torque and the motor torque pulsation, and improving the NVH performance of the motor. The magnetic steel can be stably limited between the back plate and the pressure plate, and the rotor has good stability after assembly, thereby ensuring the stability of the motor operation. At the same time, adding soft magnetic composite elements to the rotor can reduce iron loss and eddy current loss.

[0038] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0040] Figures 1 to 3 is a stereoscopic diagram showing a rotor assembly from different viewing angles according to an exemplary embodiment.

[0041] Figures 4 to 6 It is a schematic structural diagram showing different viewing angles of a back plate in a rotor assembly according to an exemplary embodiment.

[0042] Figures 7 to 9 The figure is a schematic diagram of assembling a soft magnetic composite component in a rotor assembly according to an exemplary embodiment.

[0043] Fig.10 and Fig.11 The figure is a schematic diagram of assembling a pressure plate in a rotor assembly according to an exemplary embodiment.

[0044] Fig.12 and Fig.13 It is a schematic diagram of assembling magnetic steel in a rotor assembly according to an exemplary embodiment.

[0045] Figures 14 to 16 It is a schematic structural diagram showing different viewing angles of a pressure plate in a rotor assembly according to an exemplary embodiment.

[0046] Fig.17 It is a schematic structural diagram of a sleeve in a rotor assembly according to an exemplary embodiment.

[0047] Fig.18 and Fig.19 It is a schematic structural diagram of a soft magnetic composite element in a rotor assembly according to an exemplary embodiment.

[0048] Figure 20 to Figure 22 It is a schematic diagram of the structure of magnetic steel in a rotor assembly according to an exemplary embodiment.

[0049] Fig.23 is a schematic structural diagram of a motor according to an exemplary embodiment.

[0050] Fig.24 is an exploded diagram of a motor according to an exemplary embodiment.

[0051] Fig.25 is an exploded diagram of a stator in a motor according to an exemplary embodiment.

[0052] Fig.26It is a schematic structural diagram of a cooling circuit of a motor according to an exemplary embodiment.

[0053] Figure 27 to Figure 29 The figure is a flow chart of assembling a rotor according to an exemplary embodiment.

[0054] Description of Reference Numerals

[0055] 1-rotor; 11-back plate; 110-convex rib; 111-first platform; 112-second platform; 1120-first fastening hole; 113-third platform; 1130-weight reduction hole; 1131-mounting hole; 114-lap edge; 12-pressing plate; 120-main body; 121-spoke; 1200-second fastening hole; 1210-tooth groove; 1211-first end; 1212-second end; 10-limiting space; 100-opening; 13-sheath; 14-tightening Firmware; 2-soft magnetic composite element; 21-positioning groove; 3-magnetic steel; 31-step portion; 301-inner arc; 302-outer arc; 303-first bevel; 304-second bevel; 4-shell; 41-shell body; 411-liquid inlet; 412-liquid outlet; 42-end cover; 5-stator core; 500-stator slot; 501-first chamber; 502-second chamber; 51-cover plate; 52-inner ring fixing ring; 53-fixing piece; 6-stator winding; 7-rotating shaft. DETAILED DESCRIPTION

[0056] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0057] In the present disclosure, unless otherwise specified, directional words such as "circumferential" and "radial" are generally used relative to the rotation axis of the motor provided by the present disclosure, and "inside" and "outside" may refer to the inside and outside of the corresponding component contour or the inside or outside of the environment in which it is located, depending on the specific context. In addition, when the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The terms "first", "second", etc. used in the present disclosure are to distinguish one element from another and have no order or importance.

[0058] In an axial flux motor, the shape of the magnet affects the magnetic field distribution and motor performance. In the related art, the axial flux motor uses symmetrical magnets, which have poor NVH performance and torque ripple performance.

[0059] Based on this, according to the first aspect of the present disclosure, Figures 1 to 13 As shown, a rotor assembly is provided, which includes a rotor disk, a soft magnetic composite element 2 fixed on the rotor disk, and a plurality of magnetic steels 3, wherein each magnetic steel 3 is an asymmetric structure with respect to the radial direction of the rotor disk. The "asymmetric structure" here refers to the symmetrical magnetic steel in the prior art. In the symmetrical magnetic steel, the end of the outer ring of the magnetic steel and the end of the inner ring of the magnetic steel are usually located in the same radial direction. In the asymmetric magnetic steel, the outer ring of the magnetic steel and the inner ring of the magnetic steel are staggered at an oblique polar angle along the circumferential direction, and the end of the outer ring of the magnetic steel and the end of the inner ring of the magnetic steel are not located in the same radial direction to form an asymmetric structure.

[0060] In the rotor assembly provided by the present disclosure, the magnetic steel 3 is designed as an asymmetric structure, and the outer magnetic steel ring and the inner magnetic steel ring are staggered at a certain angle in the circumferential direction, which can effectively reduce the cogging effect, thereby reducing the cogging torque and motor torque pulsation, and improving the NVH performance of the motor. At the same time, adding a soft magnetic composite element 2 on the rotor disk can reduce iron loss and eddy current loss.

[0061] like Fig. 20 and Fig.21 As shown, the magnetic steel 3 has an inner arc 301, an outer arc 302, and a first bevel 303 and a second bevel 304 connecting the two ends of the inner arc 301 and the outer arc 302. The outer ends of the first bevel 303 and / or the second bevel 304 are inclined in a clockwise direction or a counterclockwise direction relative to the inner end. In the embodiment shown in the figure, the outer end of the first bevel 303 is inclined in a counterclockwise direction relative to the inner end, and the outer end of the second bevel 304 is inclined in a counterclockwise direction relative to the inner end. Of course, the present disclosure also includes an embodiment in which the outer end of the first bevel 303 is inclined in a clockwise direction relative to the inner end, and the outer end of the second bevel 304 is inclined in a clockwise direction relative to the inner end, and also includes an embodiment in which only the outer end of the first bevel 303 or only the second bevel 304 is inclined in a clockwise direction relative to the inner end, and also includes an embodiment in which only the outer end of the first bevel 303 or only the second bevel 304 is inclined in a counterclockwise direction relative to the inner end. All of these can form an asymmetric magnetic steel and belong to the protection scope of the present disclosure. In addition, several magnetic steels 3 in the present disclosure can adopt the same asymmetric structure to facilitate the processing and fixing of multiple magnetic steels.

[0062] like Fig. 22 As shown, the central angle of the inner arc 301 is , the central angle of the outer arc 302 is ,in, Relative to The polar angle β is staggered in the clockwise or counterclockwise direction. In the embodiment shown in the figure, Relative to The present disclosure also includes the following: Relative to In the embodiment of staggering the oblique polar angle β in the clockwise direction, the present disclosure also includes deflection only on one side of the arc (the left side in the figure), that is, Greater than The present disclosure also includes an embodiment in which the angle is only deflected on one side of the arc (the right side in the figure), that is, Greater than The specific value of the oblique polar angle β can be limited as needed, and the present disclosure does not limit this. The outer arc 302 of the magnetic steel 3 is staggered by an oblique polar angle β relative to the inner arc 301 in the circumferential direction, which can increase nonlinear elements and effectively reduce the cogging effect (the cogging effect is a periodic torque with an angle, which will produce torque fluctuations and corresponding speed fluctuations).

[0063] In a preferred embodiment of the present disclosure, ,in, is the number of poles of the motor, is the pole arc coefficient of the magnetic steel. The central angle of the inner arc 301 The central angle corresponding to the outer arc Equal, the cogging effect can be eliminated to the greatest extent. Here, the number of poles of the motor, that is, the number of magnetic poles of the motor, is divided into N poles and S poles. Generally, one N pole and one S pole are called a pair of magnetic poles, that is, the number of pole pairs is 1. Therefore, if the number of pole pairs of the motor is 1, 2, 3, or 4, then the number of poles of the motor is 2, 4, 6, or 8. The pole arc coefficient refers to the coefficient of the actual air gap magnetic field distribution within a pole pitch range. Its size is determined by the distribution curve of the magnetic field, and therefore it is determined by the shape of the excitation magnetic potential distribution curve, the uniformity of the air gap, and the saturation of the magnetic circuit. In the case of the existing pole arc coefficient, the pole arc coefficient refers to the ratio of the average value of the magnetic induction intensity of each pole air gap to the maximum value.

[0064] In this disclosure, , where s is the number of slots in the stator core of the motor, specifically the number of stator slots 500 to be introduced below, and N is a positive rational number, which can be 0.5, 1, 2, 3, etc. In the preferred embodiment of the present disclosure, N=1, the outer arc 302 is circumferentially staggered by an angle of a stator tooth (the angle between the center lines of two adjacent stator slots 500) relative to the inner arc 301, and the skew angle of the magnetic steel is associated with the angle of the stator tooth, which can effectively reduce the cogging effect.

[0065] Furthermore, considering that the soft magnetic composite element 2 has excellent magnetic properties, low eddy current loss and high magnetic permeability, the rotor assembly provided by the present disclosure is additionally provided with a soft magnetic composite element 2. Figures 4 to 9As shown, the rotor disk includes a back plate 11, and a soft magnetic composite element 2 is fixed on the back plate 11. The soft magnetic composite element 2 can be a whole piece directly fixed on the back plate 11, or it can be a plurality of soft magnetic composite elements 2 arranged in sequence along the circumferential direction. The plurality of soft magnetic composite elements 2 can have the same structure or different structures, all of which belong to the protection scope of the present disclosure. Compared with the embodiment in which the entire back plate 11 is made of soft magnetic composite materials, designing the soft magnetic composite element 2 as a plurality can reduce costs.

[0066] In order to stably fix the plurality of soft magnetic composite elements 2 on the back plate 11, the back plate 11 has a first platform 111 and a second platform 112 that are arranged protrudingly, the diameter of the first platform 111 is greater than the diameter of the second platform 112, the height of the second platform 112 is greater than the height of the first platform 111, the soft magnetic composite element 2 is fixed on the first platform 111, and the plurality of soft magnetic composite elements 2 are arranged in sequence around the circumference of the second platform 112, and the top surface of the soft magnetic composite element 2 is flush with the surface of the second platform 112 to form Fig. 9 Here, the top surface of the soft magnetic composite component 2 is flush with the surface of the second platform 112, which can provide a stable plane for the subsequent fixing of the magnetic steel 3, and facilitate the installation and fixing of the magnetic steel 3 in the later stage.

[0067] like Figure 4 , Fig.18 and Fig.19 As shown, a plurality of convex ribs 110 arranged at intervals along the circumferential direction are provided on the first platform 111, and the soft magnetic composite component 2 has a positioning groove 21 that cooperates with the convex rib 110. Through the cooperation between the convex rib 110 and the positioning groove 21, a plurality of soft magnetic composite components 2 can be pre-positioned to ensure the installation position of each soft magnetic composite component 2, so that the soft magnetic composite component 2 and the back plate 11 can be fixed by glue later.

[0068] In this embodiment, if Fig.18 and Fig.19 As shown, the soft magnetic composite element 2 may be a fan-shaped structure, and the positioning groove 21 extends radially and is arranged at the middle position of the fan-shaped structure, which can ensure that the areas of the soft magnetic composite elements 2 on both sides of the convex rib 110 are not much different, and facilitate the docking of the convex rib 110 and the positioning groove 21. In other embodiments, the soft magnetic composite element 2 can also be designed as an annular structure, and a plurality of soft magnetic composite elements 2 are sequentially arranged from the inside to the outside in the radial direction, and the convex rib 110 can be arranged circumferentially, and the shape of the convex rib 110 matches the shape of the positioning groove 21, and the cross-section of the convex rib 110 can be square, semicircular, etc.

[0069] In the present disclosure, the contact surfaces of the soft magnetic composite element 2 and the back plate 11 and the adjacent soft magnetic composite elements 2 are bonded and fixed respectively. Here, they can be bonded and fixed by glue or double-sided tape, etc., and the present disclosure does not limit this.

[0070] Further, in order to achieve the fixation of a plurality of magnetic steels 3, in the present disclosure, as Figures 10 to 16 As shown, the rotor disk provided by the present invention also includes a pressure plate 12, which is installed on the back plate 11 for fixing a plurality of magnets 3. The pressure plate 12 has a main body 120 and a plurality of spokes 121 arranged in a radial disk shape. A limiting space 10 for accommodating the magnet 3 is formed between the soft magnetic composite element 2 and two adjacent spokes 121. An opening 100 is formed at the outer ends of the two adjacent spokes 121. The magnet 3 can be inserted into the limiting space 10 from the opening 100. The magnet 3 can be stably limited between the two spokes 121. After the rotor is assembled, it has good stability, thereby ensuring the stability of the motor operation.

[0071] To adapt to the asymmetric magnetic steel 3, such as Fig.15 and Fig.16 As shown, the spoke 121 has a first end 1211 connected to the main body 120 and a second end 1212 opposite to the first end 1211, wherein the second end 1212 of the spoke 121 is deflected clockwise or counterclockwise relative to the first end 1211. In an exemplary embodiment of the present disclosure, multiple spokes 121 can be deflected in the same direction, and the deflection angle can be an oblique polar angle β, so that the limiting space 10 between two adjacent spokes 121 can be completely matched with the shape of the magnetic steel 3, ensuring the fixing effect on the magnetic steel 3. In an embodiment with only one-side deflection, some of the spokes 121 are arranged radially, and the second ends 1212 of some of the spokes 121 are deflected relative to the first end 1211.

[0072] like Figure 7 As shown, the back plate 11 has a protruding third platform 113, the diameter of the third platform 113 is smaller than the diameter of the second platform 112, and the height of the third platform 113 is greater than the height of the second platform 112. Fig.11 and Fig.14 As shown, multiple spokes 121 are arranged at intervals along the circumference of the main body 120. The main body 120 is mounted on the third platform 113 and installed on the second platform 112 through the fasteners 14. The surface of the main body 120 is flush with the top surface of the third platform 113. The thickness of the pressure plate 12 can be designed according to the thickness of the magnetic steel 3. After assembly, the surface of the magnetic steel 3 is flush with the surface of the pressure plate 12, which is convenient for the subsequent assembly of the entire rotor 1. Figure 4 and Fig.14As shown, the second platform 112 is provided with a first fastening hole 1120, and the main body 120 is provided with a plurality of second fastening holes 1200. The fastener 14 passes through the second fastening hole 1200 and the first fastening hole 1120 to fix the pressure plate 12. The second fastening hole 1200 can be a step hole, and the fastener 14 will not protrude from the surface of the main body 120, ensuring the flatness of the entire surface after assembly. The back plate 11 is provided with a mounting hole 1131 for the shaft 7 to pass through, and the shaft 7 and the mounting hole 1131 can be splined to drive the rotor to rotate. The third platform 113 of the back plate 11 is also provided with a weight reduction hole 1130, which can reduce the weight of the entire back plate 11, in line with the lightweight design principle.

[0073] like Fig.14 and Fig.21 As shown, the cross section of the spoke 121 can be a T-shaped structure, and steps 31 are respectively provided on both sides of the magnetic steel 3, and the step portion 31 cooperates with the tooth groove 1210 on one side of the T-shaped structure, and the surface of the magnetic steel 3 is flush with the top surface of the pressing plate 12. Through the cooperation of the step portion 31 and the tooth groove 1210, the spoke 121 can be pressed onto the magnetic steel 3, and the axial limit of the magnetic steel 3 is realized, which is more stable and reliable.

[0074] In the embodiment in which the magnetic steel 3 has an asymmetric structure, the shape of the limiting space 10 formed between two adjacent spokes 121 is adapted to the shape of the magnetic steel 3, and the angle of the two adjacent spokes 121 can be designed according to the first bevel 303 and the second bevel 304 of the magnetic steel 3. The installation position of the pressure plate 12 is configured as a piece of magnetic steel 3 spanning two soft magnetic composite components 2. In the axial direction, the magnetic steel 3 can also play a fixing role on the soft magnetic composite component 2.

[0075] like Figure 5 and Figure 6 As shown, the back plate 11 has an overlap edge 114 located at the outer edge of the first platform 111. Fig.17 As shown, the rotor disk further includes a sheath 13 sleeved on the outer periphery of the plurality of magnetic steels 3, and the axial width of the sheath 13 is equal to the axial width of the overlap edge 114. After the sheath 13 is sleeved, the end face of the sheath 13 can contact the overlap edge 114, and the sheath 13 wraps the plurality of magnetic steels 3, which can offset the centrifugal force during high-speed rotation.

[0076] According to a second aspect of the present disclosure, a rotor assembly method is provided, wherein the rotor may be the rotor assembly described in the above embodiment, such as Fig. 27As shown, the assembly method includes: step 2501, fixing the soft magnetic composite component 2 on the back plate 11; step 2502, fixing the pressing plate 12 on the back plate 11; step 2503, fixing multiple magnetic steels 3 in sequence; and step 2504, sleeve 13 on the outer periphery of the multiple magnetic steels 3. In the present disclosure, the soft magnetic composite component 2 can be a whole ring that matches the shape of the first platform 111, or it can be split into multiple soft magnetic composite components, all of which belong to the protection scope of the present disclosure.

[0077] like Figures 7 to 9 , Fig.28 As shown, step 2501 includes: step 25011, aligning the positioning groove 21 of the soft magnetic composite component 2 with the convex rib 110 on the back plate 11, pressing the two together in the axial direction and fixing them with glue; step 25012, sequentially fixing multiple soft magnetic composite components 2 on the first platform 111 of the back plate 11. Fig.10 and Fig.11 As shown, the pressing plate 12 is fixed to the second platform 112 of the back plate 11 by means of fasteners 14, and a limiting space 10 is formed between the main body 120 of the pressing plate 12, the two spokes 121, and the soft magnetic composite components 2. Fig.29 As shown, step 2503 includes: step 25031, inserting the magnetic steel into the limiting space 10 formed by the two adjacent spokes 121 of the pressure plate 12 and the soft magnetic composite element 2 in the radial direction, and bonding and fixing, specifically, applying glue on the contact surface of the magnetic steel 3 and the soft magnetic composite element 2 and the contact surface of the pressure plate 12, inserting the magnetic steel 3 from the opening 100 in the radial direction, and completing the fixing of the magnetic steel 3 through the mutual cooperation of the step portion 31 and the tooth groove 1210; step 25032, inserting multiple magnetic steels 3 into the corresponding limiting space 10 in sequence. Finally, the sheath 13 is installed on the outside of the magnetic steel 3 to complete the assembly process of the entire rotor.

[0078] According to a third aspect of the present disclosure, a motor is provided, which may be an axial flux motor, such as Figure 23 to Figure 25 As shown, the motor includes a housing 4, a rotor 1 arranged in the housing 4, a stator core 5, a stator winding 6 and a rotating shaft 7. Stator slots 500 are respectively arranged on both end surfaces of the stator core 5. The stator winding 6 is arranged in the stator slots 500. The rotor 1 is respectively arranged at both ends of the stator core 5. The rotor 1 can be the rotor assembly introduced in the above embodiment. The motor has all the beneficial effects of the above rotor assembly, which will not be described in detail here.

[0079] In this motor, Fig.24 and Fig.25As shown, the shell 4 includes a shell body 41 and end covers 42 located at both ends. The stator and the rotor 1 are both arranged in a closed space surrounded by the shell body 41 and the end covers 42. The stator includes a stator core 5, a stator winding 6, an inner ring fixing ring 52, a fixing part 53 and cover plates 51 located at both ends. The cover plates 51 on both sides are respectively provided with the rotor assemblies introduced above.

[0080] like Fig.26 As shown, stator slots 500 are respectively provided on both end faces of the stator core 5, and the stator winding 6 is installed in the stator slots 500. The outer peripheral wall of the stator core 5 is provided with slots arranged in the radial direction, and the slots can be used as cooling channels to guide the cooling medium of the outer ring to the inner ring of the stator core 5, thereby cooling the stator core 5 and improving the cooling effect. The slots can also allow the fixing member 53 to pass through the stator core 5, play a role in fixing the stator core 5, realize bidirectional fixing of the stator core 5, solve the problem of reverse movement, and will not affect the installation of the stator winding 6, ensuring the slot full rate of the stator winding 6.

[0081] In this embodiment, in order to stably fix the stator core 5 in the housing 4, the inner ring fixing ring 52 is fixedly installed inside the stator core 5, the fixing member 53 is inserted into the slot of the stator core 5, one end of the fixing member 53 is fixed to the inner wall of the housing 4, and the other end is fixed to the inner ring fixing ring 52. The inner ring fixing ring 52 can be fixed in the inner ring of the stator core 5 by interference fit, and the fixing member 53 can be a spoke that can pass through the slot, the outer side is fixed to the inner wall of the housing 4 by bolts, and the inner side is fixed to the inner ring fixing ring 52 by rivets, so that the stator core 5, the housing 4 and the inner ring fixing ring 52 can be fixed in both directions in the axial direction, thereby improving the overall strength and stability of the stator structure, thereby improving the reliability of the motor.

[0082] Furthermore, in the motor, in order to cool the stator core 5 and the stator winding 6, as shown in FIG. Fig.26As shown, a liquid inlet 411 and a liquid outlet 412 are provided on the shell body 41, a first chamber 501 is formed between the outer peripheral wall of the stator core 5 and the inner wall of the shell body 41, a second chamber 502 is formed on the inner side of the inner peripheral wall of the stator core 5, and the stator core 5 has slots arranged in the radial direction, wherein the liquid inlet 411 and the liquid outlet 412 are connected to the first chamber 501, and the first chamber 501 and the second chamber 502 are connected through the slots. In this way, the coolant flowing in from the liquid inlet 411 enters the first chamber 501. At this time, the temperature of the coolant is relatively low. Part of the coolant in the first chamber 501 flows along the outer ring under the action of gravity, and gathers and flows out at the liquid outlet 412, so as to cool and lubricate the stator core 5 and the stator winding 6 of the outer ring; another part of the coolant in the first chamber 501 flows into the second chamber 502 through the slot hole, cools the stator core 5 and the stator winding 6 on the inner side, and flows out from the slot hole below to the first chamber 501, gathers at the liquid outlet 412 and flows out, forming a whole cooling circuit, thereby improving the heat dissipation effect on the stator core 5 and the stator winding 6.

[0083] According to a fourth aspect of the present disclosure, a vehicle is provided, which includes the motor introduced above. The vehicle has all the beneficial effects of the motor introduced in the above embodiments, which will not be repeated here.

[0084] In the above detailed description, reference is made to the accompanying drawings, which illustrate specific aspects of the present disclosure that can be practiced by way of illustration. In this regard, terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating directions or representing positional relationships, can be used with reference to the orientation of the described figures. Since the components of the described device can be positioned in a plurality of different orientations, directional terms can be used for illustrative purposes rather than restrictive. It should be understood that other aspects can be utilized and structural or logical changes can be made without departing from the concepts of the present disclosure. Therefore, the following detailed description should not be considered in a limiting sense.

[0085] It should be understood that, unless otherwise specifically noted, the features of some embodiments of the various present disclosures described herein may be combined with each other. As used herein, the term "and / or" includes any one of the related listed items and any combination of any two or more; similarly, "at least one of . . . " includes any one of the related listed items and any combination of any two or more.

[0086] It should be understood that, unless otherwise clearly specified and limited, the terms "joining", "attaching", "installing", "connecting", "connecting", "fixing" and the like used in the embodiments of the present disclosure should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For ordinary technicians in this field, the specific meanings of the above terms in this article can be understood according to specific circumstances.

[0087] In addition, the term "above" used in relation to a component, element or material layer formed "above" or located "above" a surface may be used herein to indicate that the component, element or material layer is "indirectly" positioned (e.g., placed, formed, deposited, etc.) on the surface such that one or more additional components, elements or layers are arranged between the surface and the component, element or material layer. However, the term "above" used in relation to a component, element or material layer formed "above" or located "above" a surface may also optionally have a specific meaning: the component, element or material layer is "directly" positioned (e.g., placed, formed, deposited, etc.) on the surface, such as in direct contact with the surface.

[0088] Although terms such as "first", "second" and "third" can be used herein to describe various components, parts, regions, layers or sections, these components, parts, regions, layers or sections are not limited to these terms. On the contrary, these terms are only used to distinguish one component, component, region, layer or section from another component, component, region, layer or section. Therefore, without departing from the teachings of each example, the first component, component, region, layer or section mentioned in the examples described herein may also be referred to as the second component, component, region, layer or section. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first" and "second" may expressly or implicitly include at least one of the features. In the description herein, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0089] It should be understood that spatially relative terms such as "above", "upper", "below", and "lower" are used herein to describe the relationship of one element to another element shown in the figures. In addition to the orientation depicted in the drawings, such spatially relative terms are intended to include different orientations of the device in use or operation. For example, if the device in the drawings is turned over, an element described as being "above" or "upper" relative to another element will be "below" or "lower" relative to the other element. Therefore, depending on the spatial orientation of the device, the term "above" includes both upper and lower orientations. The device may have other orientations (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used herein should be interpreted accordingly.

[0090] In addition, the word "exemplary" is used herein to indicate serving as an example, instance, or diagram. Any aspect or design described as "exemplary" in this article is not necessarily understood to be advantageous compared to other aspects or designs. On the contrary, the use of the word exemplary is intended to present concepts in a specific way. As used herein, the term "or" is intended to represent an inclusive "or" rather than an exclusive "or". That is, unless otherwise specified or clear from the context, "X applies A or B" is intended to represent any one of the natural inclusive arrangements. That is, if X applies A; X applies B; or X applies both A and B, "X applies A or B" is satisfied under any of the aforementioned examples. In addition, unless otherwise specified or clearly pointed to a singular form from the context, the articles "one" and "an" as used in this application and the appended claims are generally understood to mean "one or more".

[0091] Likewise, although the present disclosure has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art after reading and understanding the specification and drawings. The present disclosure includes all such modifications and variations and is limited only by the scope of the claims. In particular, with respect to the various functions performed by the components (e.g., elements, resources, etc.) described above, unless otherwise indicated, the terms used to describe such components are intended to correspond to any component (functionally equivalent) that performs the specific functions of the described components, even if the structure is not equivalent to the disclosed structure. In addition, although specific features of the present disclosure may have been disclosed with respect to only one of several implementations, such features may be combined with one or more other features of other implementations as may be desired and beneficial to any given or specific application. In addition, with respect to "including", "having", "having", "having", or variations thereof used in a specific embodiment or claim, such terms are intended to be inclusive in a manner similar to the term "comprising".

[0092] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

[0093] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A motor, characterized in that: include: case, The stator core and the stator winding are arranged in the housing, the two end surfaces of the stator core are respectively provided with stator slots, and the stator winding is arranged in the stator slots; The rotor is provided at both ends of the stator core, and the rotor comprises: A back plate, on which a soft magnetic composite element is fixed; A pressure plate, mounted on the back plate and used for fixing a plurality of magnetic steels, each of the magnetic steels being an asymmetric structure with respect to the radial direction of the rotor; and A sheath, which is sleeved on the outer periphery of the plurality of magnetic steels; The back plate has a first platform and a second platform that are protrudingly arranged, the diameter of the first platform is greater than the diameter of the second platform, the height of the second platform is greater than the height of the first platform, the soft magnetic composite element is fixed on the first platform and is arranged in sequence in a circumferential direction around the second platform, and the top surface of the soft magnetic composite element is flush with the surface of the second platform.

2. The motor according to claim 1, characterized in that The magnetic steel has an inner arc, an outer arc, and a first bevel and a second bevel connecting the two ends of the inner arc and the outer arc. The outer ends of the first bevel and / or the second bevel are inclined in a clockwise direction or a counterclockwise direction relative to the inner end.

3. The motor according to claim 2, characterized in that The central angle of the inner arc is , the central angle of the outer arc is ,in, Relative to The polar angle β is staggered in clockwise or counterclockwise direction.

4. The motor according to claim 3, characterized in that ,in, is the number of poles of the motor, is the pole arc coefficient of the magnetic steel.

5. The motor according to claim 3, characterized in that: , where s is the number of slots in the stator core of the motor and N is a positive rational number.

6. The motor according to claim 1, characterized in that One magnetic steel spans across two of the soft magnetic composite elements.

7. The motor according to claim 1, characterized in that The first platform is provided with a plurality of convex ribs spaced apart along the circumferential direction, and the soft magnetic composite element has a positioning groove which is limitedly matched with the convex ribs.

8. The motor according to claim 7, characterized in that The soft magnetic composite element is a fan-shaped structure, and the positioning groove extends radially and is arranged at the middle position of the fan-shaped structure.

9. The motor according to claim 1, characterized in that The surfaces where the soft magnetic composite components contact the back plate and two adjacent soft magnetic composite components are bonded and fixed respectively.

10. The motor according to any one of claims 1 to 9, characterized in that: The pressure plate has a main body and a plurality of spokes arranged in a radial disk, wherein the spoke has a first end connected to the main body and a second end opposite to the first end, wherein the second end of the spoke is deflected clockwise or counterclockwise relative to the first end.

11. The motor according to claim 10, characterized in that The main body is fixed to the back plate, and the soft magnetic composite element and the two adjacent spokes together form a limiting space for accommodating the magnetic steel. The outer ends of the two adjacent spokes form an opening, and the magnetic steel can be inserted into the limiting space from the opening. The limiting space matches the shape of the magnetic steel.

12. The motor according to claim 11, characterized in that The back plate has a second platform and a third platform which are protrudingly arranged, the diameter of the third platform is smaller than the diameter of the second platform, and the height of the third platform is greater than the height of the second platform. The pressure plate has a main body, and a plurality of spokes are arranged at intervals along the circumference of the main body. The main body is sleeved on the third platform and installed on the second platform through fasteners, and the surface of the main body is flush with the top surface of the third platform.

13. The motor according to claim 11, characterized in that The cross section of the spoke is a T-shaped structure, and steps are respectively provided on both sides of the magnetic steel, the steps match with the tooth grooves on one side of the T-shaped structure, and the surface of the magnetic steel is flush with the top surface of the pressure plate.

14. The motor according to claim 1, characterized in that The back plate has an overlapping edge located at the outer edge of the first platform, and the axial width of the sheath is equal to the axial width of the overlapping edge.

15. A vehicle, characterized in that: A motor comprising any one of claims 1-14.

16. A method for assembling a rotor, characterized in that: The rotor is a rotor in a motor according to any one of claims 1 to 14, and the assembly method comprises: fixing the soft magnetic composite component on the back plate; Fix the pressure plate to the back plate; fixing a plurality of magnetic steels in sequence; and The sheath is disposed on the outer circumference of the plurality of magnetic steels.

17. The rotor assembly method according to claim 16, characterized in that: The step of fixing the soft magnetic composite element on the back plate comprises: Align the positioning groove of the soft magnetic composite element with the convex rib on the back plate, and press and fix them in the axial direction; A plurality of the soft magnetic composite components are fixed on the back plate in sequence.

18. The rotor assembly method according to claim 16, characterized in that: The step of sequentially fixing a plurality of magnetic steels comprises: Inserting the magnetic steel radially into the limiting space formed by two adjacent spokes of the pressing plate and the soft magnetic composite element, and bonding and fixing them; Insert multiple magnetic steels into corresponding limiting spaces in sequence and fix them with glue.

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