Motor stator assembly and motor

Abstract

This application provides a motor stator assembly and a motor. The motor stator assembly includes a first stator, a second stator, and a plurality of support members. A plurality of first conductor slots are formed on the outer periphery of a first iron core of the first stator, and a first winding of the first stator is mounted in the plurality of first conductor slots. A plurality of second conductor slots are formed on the inner periphery of a second iron core of the second stator, and a second winding of the second stator is mounted in the plurality of second conductor slots. A radial gap extending continuously along the circumference of the motor stator assembly is formed between the outer peripheral surface of the second iron core and the inner peripheral surface of the first iron core. The plurality of support members are spaced apart circumferentially and located within the radial gap to support the first and second iron cores, such that the first and second iron cores are not in direct contact and the magnetic fields of the first and second stators are decoupled from each other. This substantially reduces or eliminates torque fluctuations and NVH problems caused by magnetic field coupling.

Description

Technical Field

[0001] This application relates to the field of electric motors, and particularly to an electric motor stator assembly and an electric motor including the electric motor stator assembly. Background Technology

[0002] Currently, electric motors can function as generators to output torque and power, and they can also act as generators to charge batteries. Therefore, electric motors can be used in the power systems of pure electric vehicles or hybrid vehicles. To meet the cost and performance requirements of vehicles, it is necessary to reduce the cost of electric motors while increasing their power density, and also to have a smaller size while maintaining performance. To address this, existing technologies include solutions that integrate two sets of stators and rotors into a single motor to meet all the aforementioned requirements.

[0003] For example, German patent application DE 10 2022 107 665 A1 discloses a motor in which one winding is mounted on the outer periphery of an iron core and another winding is mounted on the inner periphery of the same iron core, thereby arranging the two windings in a radially stacked manner on the same iron core. However, in this motor, the magnetic field generated by the radially outer winding in conjunction with the iron core and the magnetic field generated by the radially inner winding in conjunction with the iron core coupling occur, which will cause fluctuations in the output torque of the motor and generate NVH problems. Summary of the Invention

[0004] This application is made in view of the state of the prior art described above. One object of this application is to provide a motor stator assembly that can substantially reduce or avoid the coupling of magnetic fields generated by two radially stacked windings.

[0005] Another object of this application is to provide a motor including the above-described motor stator assembly, which can substantially reduce or eliminate torque fluctuations and NVH problems caused by the coupling of magnetic fields generated by two radially stacked windings and iron cores.

[0006] To achieve the above objectives, the present application may adopt the following technical solutions.

[0007] This application provides a motor stator assembly including:

[0008] The first stator includes a first iron core and a first winding. The outer periphery of the first iron core forms a plurality of first conductor slots, and the first winding is mounted in the plurality of first conductor slots.

[0009] The second stator includes a second iron core and a second winding. A plurality of second conductor slots are formed on the inner circumference of the second iron core. The second winding is mounted in the plurality of second conductor slots. The second iron core is coaxially arranged with the first iron core and located radially inside the first iron core. A radial gap exists between the outer circumferential surface of the second iron core and the inner circumferential surface of the first iron core, extending continuously along the circumference of the motor stator assembly.

[0010] Multiple support members are spaced apart in the circumferential direction, each of the support members being at least partially located in the radial gap and simultaneously supporting the first iron core and the second iron core in the radial direction of the motor stator assembly, such that the first iron core and the second iron core are not in direct contact and the magnetic field of the first stator and the magnetic field of the second stator are decoupled from each other.

[0011] In one alternative embodiment, the inner circumferential surface of the first iron core has a first protrusion that protrudes radially inward, and the outer circumferential surface of the second iron core has a second concave portion that is recessed radially inward and complementary in shape to the corresponding first protrusion.

[0012] The first iron core has a first axial through hole formed in the first protrusion. The first axial through hole has an opening that opens toward the second iron core. The support member is inserted into the first axial through hole and supports the second iron core through the opening.

[0013] In another alternative embodiment, the inner circumferential surface of the first iron core has a first recess that is recessed radially outward, and the outer circumferential surface of the second iron core has a second protrusion that protrudes radially outward and is complementary in shape to the corresponding first recess.

[0014] The second iron core has a second axial through hole formed in the second protrusion. The second axial through hole has an opening that opens toward the first iron core. The support member is inserted into the second axial through hole and supports the first iron core through the opening.

[0015] In another alternative embodiment, the inner circumferential surface of the first iron core has a first recess and a first convex portion, the first recess being recessed radially outward and the first convex portion being protruded radially inward; the outer circumferential surface of the second iron core has a second convex portion and a second recess, the second recess being recessed radially inward and complementary in shape to the corresponding first convex portion, and the second convex portion being protruded radially outward and complementary in shape to the corresponding first recess.

[0016] The first iron core has a first axial through hole formed in the first protrusion. The first axial through hole has a first opening that opens toward the second iron core. The support member is inserted into the first axial through hole and supports the second iron core through the first opening.

[0017] The second iron core has a second axial through hole formed in the second protrusion. The second axial through hole has a second opening that opens toward the first iron core. The support member is inserted into the second axial through hole and supports the first iron core through the second opening.

[0018] In another alternative, the first recess and the first convex are complementary in shape, and the first recess and the first convex are evenly distributed alternately in the circumferential direction.

[0019] In another alternative approach, in any cross-section of the motor stator assembly perpendicular to its central axis,

[0020] The centers of the plurality of support members are located on a perfect circle, and the center of the perfect circle is located on the central axis; or

[0021] The center of the support member inserted into the first iron core is located on the first positive circle, and the center of the support member inserted into the second iron core is located on a second positive circle different from the first positive circle. The center of the first positive circle and the center of the second positive circle are both located on the central axis.

[0022] In another alternative, the radial clearance has the same radial dimension at all locations along the entire circumference.

[0023] In another alternative scheme, a first end ring and a second end ring are also included.

[0024] The first end ring has a first mounting through hole corresponding to the support member. The first end ring is mounted on one axial side of the first iron core and one axial side of the second iron core via the support member. The first end ring has a first circumferential groove that extends continuously along the entire circumference and communicates with the radial gap.

[0025] The second end ring has a second mounting through hole corresponding to the support member. The second end ring is mounted on the other side of the first iron core and the other side of the second iron core via the support member. The second end ring has a second circumferential groove that extends continuously around the entire circumference and communicates with the radial gap.

[0026] In another alternative embodiment, the first end ring is formed with a plurality of first injection holes communicating with the first circumferential groove, a portion of the plurality of first injection holes opening toward the axial end of the first winding, and another portion of the plurality of first injection holes opening toward the axial end of the second winding; and / or

[0027] The second end ring is formed with a plurality of second injection holes communicating with the second circumferential groove. A portion of the plurality of second injection holes are open toward the other axial end of the first winding, and another portion of the plurality of first injection holes are open toward the other axial end of the second winding.

[0028] This application also provides a motor comprising:

[0029] The motor stator assembly described in any of the above technical solutions;

[0030] A first rotor, located radially outside the first stator; and

[0031] The second rotor is located radially inside the second stator.

[0032] By adopting the above technical solution, this application provides a motor stator assembly. The motor stator assembly includes a first stator, a second stator, and a plurality of support members assembled together. A plurality of first conductor slots are formed on the outer periphery of the first iron core of the first stator, and a first winding of the first stator is mounted in the plurality of first conductor slots. A plurality of second conductor slots are formed on the inner periphery of the second iron core of the second stator, and a second winding of the second stator is mounted in the plurality of second conductor slots. The second iron core is coaxially arranged with the first iron core and located radially inside the first iron core. A radial gap extending continuously along the circumference of the motor stator assembly is formed between the outer peripheral surface of the second iron core and the inner peripheral surface of the first iron core. Further, the plurality of support members are spaced apart circumferentially, each support member being at least partially located within the radial gap and simultaneously supporting the first and second iron cores radially in the motor stator assembly, such that the first and second iron cores are not in direct contact and the magnetic fields of the first and second stators are decoupled from each other.

[0033] Since the first core of the first stator and the second core of the second stator are supported only by multiple support members rather than in direct contact, the overall size of the connection structure, even if the first core and the second core are indirectly in contact by the support members, is very small. Therefore, the magnetic fields of the first stator and the second stator are almost not coupled through the aforementioned connection structure. This significantly reduces or even eliminates the coupling of the magnetic fields generated by the two radially stacked stators, thus decoupling the magnetic field generated by the first winding in the first stator in conjunction with the first core and the magnetic field generated by the second winding in the second stator in conjunction with the second core.

[0034] Furthermore, this application also provides a motor including the aforementioned motor stator assembly, the motor further including a first rotor located radially outside the first stator and a second rotor located radially inside the second stator. Because the magnetic fields generated by the first stator and the second stator of the motor stator assembly are decoupled, the motor according to this application substantially reduces or eliminates torque fluctuations and NVH problems caused by the coupling of the magnetic fields generated by the two stators. Attached Figure Description

[0035] Figure 1 This is a cross-sectional perspective view of an electric motor according to an embodiment of the present application, wherein the cross-sectional lines are omitted.

[0036] Figure 2 It shows Figure 1 A cross-sectional view of the motor along its central axis.

[0037] Figure 3 It shows Figure 1 A side view of the motor in the diagram.

[0038] Figure 4 It shows Figure 1 The diagram shows a side view of the first and second iron cores of the motor stator assembly of the motor, with the first and second iron cores in an assembled state.

[0039] Figure 5 It shows Figure 1 A three-dimensional schematic diagram of the first end ring of the motor stator assembly of the motor in the diagram.

[0040] Explanation of reference numerals in the attached figures

[0041] 1 First stator; 11 First iron core; 11c First conductor slot; 11h First axial through hole; 111 First protrusion; 112 First concave portion; 113 First base circle portion; 12 First winding;

[0042] 2 Second stator; 21 Second core; 21c Second conductor slot; 21h Second axial through hole; 211 Second protrusion; 212 Second recess; 213 Second base circle; 22 Second winding;

[0043] 3. Support components;

[0044] 4. Installation components;

[0045] 5 First end ring; 5c First circumferential groove; 5h1 First mounting through hole; 5h2 First injection hole;

[0046] 6 Second end ring; 6c Second circumferential groove; 6h1 Second mounting through hole; 6h2 Second injection hole;

[0047] 7. First rotor;

[0048] 8. Second rotor;

[0049] Rc is the radial clearance; A is the axial direction; R is the radial direction; C is the circumferential direction. Detailed Implementation

[0050] Exemplary embodiments of this application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are for teaching those skilled in the art how to implement this application only, and are not intended to exhaust all possible methods of this application, nor to limit the scope of this application.

[0051] In this application, unless otherwise specified, "axial," "radial," and "circumferential" refer to the axial, radial, and circumferential directions of the motor stator assembly (motor), respectively. "One side of the axial direction" refers to... Figure 2 The right side of the axis, "the other side of the axis" refers to Figure 2 On the left side, "radial outer side" refers to the side that is radially away from the central axis of the motor stator assembly, while "radial inner side" refers to the side that is radially close to the central axis of the motor stator assembly.

[0052] In this application, the “cross section” of the motor stator assembly refers to the cross section of the motor stator assembly that is perpendicular to its central axis.

[0053] The following description, in conjunction with the accompanying drawings, will illustrate an embodiment of a motor according to this application.

[0054] like Figures 1 to 3 As shown, an electric motor according to an embodiment of this application includes a motor stator assembly, a first rotor 7, and a second rotor 8 assembled together. The motor stator assembly, the first rotor 7, and the second rotor 8 can be assembled together coaxially. The first rotor 7 is located radially outward of the motor stator assembly and spaced apart from the motor stator assembly, and the first rotor 7 is rotatable relative to the motor stator assembly in the magnetic field generated by the first stator 1 described below. The second rotor 8 is located radially inward of the motor stator assembly and spaced apart from the motor stator assembly, and the second rotor 8 is rotatable relative to the motor stator assembly in the magnetic field generated by the second stator 2 described below.

[0055] In this embodiment, as Figures 1 to 3 As shown, the motor stator assembly of the motor includes a first stator 1, a second stator 2, multiple support members 3, multiple mounting members 4, a first end ring 5, and a second end ring 6 assembled together.

[0056] In this embodiment, as Figures 1 to 3 As shown, the first stator 1 includes a first iron core 11 and a first winding 12 assembled together. Figures 1 to 4As shown, the first core 11 can be constructed by stacking multiple silicon steel sheets together along the axial direction A. The first core 11 includes a main body portion with a cylindrical structure and toothed portions. Multiple teeth protrude radially outward from the main body portion and are evenly distributed at intervals along the circumferential direction C. A first conductor groove 11c is defined between every two adjacent teeth in the circumferential direction C. Each first conductor groove 11c penetrates the first core 11 along the axial direction A and has an opening that opens radially outward. Thus, the outer periphery of the first core 11 forms multiple first conductor grooves 11c that are spaced apart along the circumferential direction C of the motor stator assembly. Figures 1 to 3 As shown, the first winding 12 can be a wire cage winding (also known as a squirrel cage winding). The first winding 12 includes multiple first conductor portions mounted in multiple first conductor slots 11c and mounting rings located at both axial ends of the first winding 12. The first winding 12 can be interconnected by hairpin units to form a predetermined electrical circuit and integrated into a single unit using the mounting rings. Thus, when the first winding 12 is energized, the first winding 12, in conjunction with the first iron core 11, enables the first stator 1 to generate a desired magnetic field. Furthermore, the axial ends of the first winding 12, including the mounting rings, extend from the first iron core 11 towards both axial directions.

[0057] In this embodiment, as Figures 1 to 3 As shown, the second stator 2 includes a second iron core 21 and a second winding 22 assembled together. Figures 1 to 4 As shown, the second core 21 can be constructed by stacking multiple silicon steel sheets together along the axial direction A. The second core 21 includes a main body with a cylindrical structure and teeth. Multiple teeth protrude radially inward from the main body and are evenly distributed at intervals along the circumferential direction C. A second conductor groove 21c is defined between every two adjacent teeth in the circumferential direction C. Each second conductor groove 21c extends through the second core 21 along the axial direction A and has an opening that opens radially inward. Thus, the inner circumference of the second core 21 forms multiple second conductor grooves 21c distributed at intervals along the circumferential direction C. Figures 1 to 3 As shown, the second winding 22 can be a wire cage winding. This second winding 22 includes second conductor portions mounted in a plurality of second conductor slots 21c and mounting rings located at the axial ends of the second winding 22. The second winding 22 can be interconnected by hairpin units to form a predetermined electrical circuit and integrated into a single unit using the mounting rings. Thus, when the second winding 22 is energized, the second winding 22, in conjunction with the second iron core 21, enables the second stator 2 to generate a desired magnetic field. Furthermore, the axial ends of the second winding 22, including the mounting rings, extend from the second iron core 21 towards both axial directions. Further, as... Figures 1 to 4As shown, the second iron core 21 is located radially inside the first iron core 11, and the second iron core 21 is coaxially arranged with the first iron core 11. The second iron core 21 and the first iron core 11 have the same axial dimension, and the two axial end faces of the two iron cores are flush.

[0058] like Figure 2 and Figure 4 As shown, there is a radial gap Rc between the outer peripheral surface of the second iron core 21 and the inner peripheral surface of the first iron core 11, which extends continuously along the circumferential direction C over the entire circumference. The radial dimension of the radial gap Rc is equal at all positions along the entire circumference. Thus, the second iron core 21 and the first iron core 11 achieve indirect contact through the radial gap Rc. Furthermore, in order to make the magnetic conductive area of ​​the first iron core 11 and the second iron core 21 as uniform as possible when the axial through holes 11h and 21h for the insertion of the support member 3 are formed in the first iron core 11 and the second iron core 21, a first concave portion 112 and a first convex portion 111 are formed on the inner peripheral surface of the first iron core 11. The first concave portion 112 is recessed radially outward, and the first convex portion 111 is protruded radially inward. A second concave portion 212 and a second convex portion 211 are formed on the outer peripheral surface of the second iron core 21. The second concave portion 212 is recessed radially inward and its shape is complementary to that of the corresponding first convex portion 111. The second convex portion 211 is protruded radially outward and its shape is complementary to that of the corresponding first concave portion 112. Furthermore, a plurality of first convex portions 111 and a plurality of first concave portions 112 are provided on the inner peripheral surface of the first iron core 11. These first concave portions 112 and first convex portions 111 are arranged alternately and evenly spaced in the circumferential direction C. Between adjacent first recesses 112 and first protrusions 111 in the circumferential direction C, a first base circle portion 113 is formed on the inner circumferential surface of the first core 11. In any cross-section, the contour lines corresponding to all the first base circles 113 lie on the same perfect circle, and the center of this perfect circle is located on the central axis of the motor stator assembly. Similarly, on the outer circumferential surface of the second core 21, a plurality of second recesses 212 and a plurality of second protrusions 211 are provided, and these second recesses 212 and second protrusions 211 are arranged alternately and evenly spaced in the circumferential direction C. Between adjacent second recesses 212 and second protrusions 211 in the circumferential direction C, a second base circle portion 213 is formed on the outer circumferential surface of the second core 21. In any cross-section, the contour lines corresponding to all the second base circles 213 lie on the same perfect circle, and the center of this perfect circle is located on the central axis of the motor stator assembly. Moreover, the shapes of the first protrusion 111 and the first concave portion 112 are complementary, so that the shape and size of the concave and convex structures of the inner circumferential surface of the first iron core 11 and the outer circumferential surface of the second iron core 21 are basically the same.

[0059] In addition, such as Figure 3 and Figure 4As shown, the first iron core 11 has a first axial through hole 11h extending along the axial direction A in the first protrusion 111, and the first axial through hole 11h has a first opening that opens toward the second iron core 21. The support member 3 is inserted into the first axial through hole 11h and can abut against the second iron core 21 through the first opening. The second iron core 21 has a second axial through hole 21h extending along the axial direction A in the second protrusion 211, and the second axial through hole 21h has a second opening that opens toward the first iron core 11. The support member 3 is inserted into the second axial through hole 21h and can abut against the first iron core 11 through the second opening. In this embodiment, in any cross-section of the motor stator assembly, the centers of the plurality of first axial through holes 11h and the centers of the plurality of second axial through holes 21h are all located on the same perfect circle, the center of which is located on the central axis of the motor stator assembly. In this way, the centers of the multiple support members 3 inserted through the first axial through hole 11h and the second axial through hole 21h are located on the same perfect circle, and the center of the perfect circle is located on the central axis.

[0060] In this embodiment, the support member 3 can be a bolt. For example... Figures 1 to 3 As shown, multiple support members 3, inserted into the first axial through hole 11h and the second axial through hole 21h, are spaced apart in the circumferential direction C. A portion of each support member 3 is located in the radial direction R at the radial gap Rc between the first iron core 11 and the second iron core 21. The support member 3 can simultaneously support the first iron core 11 and the second iron core 21 to keep the two iron cores 11 and 12 in a non-direct contact state at the radial gap Rc. This ensures that the first iron core 11 and the second iron core 21 are spaced apart outside the positions where the multiple support members 3 are located. Therefore, the magnetic field coupling generated by the first winding 12 and the second winding 22 stacked in the radial direction R can be significantly reduced or even avoided, thus decoupling their magnetic fields. In this embodiment, the mounting member 4 can be a nut. Figure 1 and Figure 2 As shown, the mounting part 4 can be threaded with the threaded part of the bolt, thereby achieving the function of fixing the first iron core 11 and the second iron core 21 in the axial direction A, and fixing the first end ring 5 and the second end ring 6 to the axial end faces of the two iron cores 11 and 21.

[0061] In this embodiment, as Figures 1 to 3As shown, the first end ring 5 is formed into an annular shape that extends continuously along the circumferential direction C. The first end ring 5 is coaxially arranged with the first iron core 11 and the second iron core 21, and the first end ring 5 is mounted on one axial side of the first iron core 11 and the second iron core 21 via a support member 3 and a mounting member 4. The other axial side of the first end ring 5 has a first circumferential groove 5c that is open to the first iron core 11 and the second iron core 21. The first circumferential groove 5c extends continuously along the circumference and communicates with the radial gap Rc between the first iron core 11 and the second iron core 21. The first end ring 5 has a first mounting through hole 5h1 corresponding to the first axial through hole 11h and the second axial through hole 21h. Different support members 3 are inserted through the corresponding first mounting through hole 5h1 and the first axial through hole 11h or through the corresponding first mounting through hole 5h1 and the second axial through hole 21h. The second end ring 6 is formed into a continuous annular shape extending along the circumferential direction C. The second end ring 6 is coaxially arranged with both the first iron core 11 and the second iron core 21, and is mounted on the other axial side of the first iron core 11 and the second iron core 21 via a support member 3 and a mounting member 4. A second circumferential groove 6c is formed on the axial side of the second end ring 6, opening towards the first iron core 11 and the second iron core 21. The second circumferential groove 6c extends continuously along the circumference and communicates with the radial gap Rc between the first iron core 11 and the second iron core 21. The second end ring 6 forms a second mounting through hole 6h1 corresponding to the first axial through hole 11h and the second axial through hole 21h. Different support members 3 are inserted through the first axial through hole 11h and the corresponding second mounting through hole 6h1, or through the second axial through hole 21h and the corresponding second mounting through hole 6h1.

[0062] Furthermore, the width of the first circumferential groove 5c can remain constant throughout its circumference, and the width of the second circumferential groove 6c can also remain constant throughout its circumferential extension. The first end ring 5 or the second end ring 6 can have at least one inlet hole (not shown) for the cooling fluid to enter. Taking the first end ring 5 having an inlet hole as an example, the cooling fluid can enter the first circumferential groove 5c through the inlet hole and, after filling the first circumferential groove 5c, flow into the second circumferential groove 6c through the radial gap Rc. During this process, the cooling fluid can effectively cool the first iron core 11 and the second iron core 21.

[0063] Furthermore, such as Figure 5As shown, the first end ring 5 has a plurality of first injection holes 5h2 communicating with the first circumferential groove 5c. The first injection holes 5h2 located radially outward open towards the axial end of the first winding 12, and the first injection holes 5h2 located radially inward open towards the axial end of the second winding 22. This allows cooling to be achieved by spraying cooling fluid through the plurality of first injection holes 5h2 towards the axial ends of the first winding 12 and the second winding 22 using the pressure of the cooling fluid itself within the first circumferential groove 5c. Similarly, the second end ring 6 has a plurality of second injection holes 6h2 communicating with the second circumferential groove 6c. Of these second spray holes 6h2, the radially outer second spray hole 6h2 opens toward the axial end of the first winding 12, and the radially inner second spray hole 6h2 opens toward the axial end of the second winding 22. This allows cooling fluid to be sprayed onto the axial ends of the first winding 12 and the second winding 22 via the pressure of the cooling fluid itself within the second circumferential groove 6c. Here, each spray hole 5h2, 6h2 can extend obliquely relative to the axial direction A.

[0064] By adopting the above-described scheme, the motor stator assembly according to an embodiment of this application integrates the first stator 1 and the second stator 2 in a radially stacked manner. The motor stator assembly with this structure has a compact overall structure, occupies less space, and can significantly reduce or even avoid the coupling of the magnetic fields generated by the two stators 1 and 2 stacked in the radial direction R, thereby decoupling the magnetic field generated by the first stator 1 and the magnetic field generated by the second stator 2. In addition, by utilizing the radial gap Rc defined between the first iron core 11 of the first stator 1 and the second iron core 21 of the second stator 2, and the circumferential grooves formed by the first end ring 5 and the second end ring 6 provided on both axial sides of the assembly of the first iron core 11, the second iron core 21 and the plurality of support members 3, not only can the two iron cores 11 and 21 of the motor stator assembly be cooled, but also the two ends of the windings 12 and 22 can be cooled, which is beneficial to ensuring the performance of the motor stator assembly.

[0065] In this embodiment, as Figures 1 to 3As shown, the first rotor 7 may include a first rotor core and a rotor support, the rotor support being located radially outside the first rotor core and fixed to it. Thus, the first rotor 7 can output torque to the outside or receive torque from the outside via the rotor support. The second rotor 8 may include a second rotor core and a rotor shaft, the rotor shaft being located radially inside the second rotor core and fixed to it. Thus, the second rotor 8 can output torque to the outside or receive torque from the outside via the rotor shaft. Because the magnetic field generated by the first stator 1 and the magnetic field generated by the second stator 2 of the motor stator assembly are decoupled, the motor according to this application substantially reduces or eliminates torque fluctuations and NVH problems caused by the coupling of magnetic fields.

[0066] It should be understood that the above embodiments are merely exemplary and are not intended to limit this application. Those skilled in the art can make various modifications and changes to the above embodiments under the teachings of this application without departing from the scope of this application. The technical solutions of this application are further described below.

[0067] i. It is understood that the motor of this application can typically be applied to vehicles, not only to pure electric vehicles but also to hybrid vehicles. The power system of a pure electric vehicle can be an electric axle drive system, which may further include a transmission mechanism such as a gearbox, with the motor drivingly connected to the input shaft of the gearbox to achieve bidirectional torque transmission. The power system of a hybrid vehicle may further include an engine, and the motor according to this application can be used in conjunction with the engine to constitute a hybrid power system for the hybrid vehicle.

[0068] ii. In the above embodiments, it is described that the inner circumferential surface of the first iron core 11 has a first protrusion 111 and the outer circumferential surface of the second iron core 21 has a second protrusion 211. Further, the first iron core 11 has a first axial through hole 11h formed in the first protrusion 111 and the second iron core 21 has a second axial through hole 21h formed in the second protrusion 211. However, this application is not limited to this. In other alternative examples, the following variations can be adopted.

[0069] In an optional example, the inner circumferential surface of the first core 11 has a first protrusion 111 but no first recess 112, the first protrusion 111 protruding radially inward. The outer circumferential surface of the second core 21 has a second recess 212 but no second protrusion 211, the second recess 212 being recessed radially inward and complementary in shape to the corresponding first protrusion 111. The first core 11 has a first axial through hole 11h formed in the first protrusion 111, the first axial through hole 11h opening toward the second core 21, and the support member 3 is inserted into the first axial through hole 11h. The second core 21 does not have a second axial through hole 21h.

[0070] It is understandable that, due to the existence of the radial clearance Rc, the concave or convex parts do not need to be completely complementary in a mathematical and geometric sense; rather, they only need to roughly fit together. In other words, the complementarity of the concave and convex parts is in the sense that there is still a radial clearance Rc between them.

[0071] In another alternative example, the inner circumferential surface of the first core 11 has a first recess 112 but no first protrusion 111, the first recess 112 being recessed radially outward. The outer circumferential surface of the second core 21 has a second protrusion 211 but no second recess 212, the second protrusion 211 being radially outward and complementary in shape to the corresponding first recess 112. The second core 21 has a second axial through hole 21h formed in the second protrusion 211, the second axial through hole 21h being open toward the first core 11, and the support member 3 being inserted into the second axial through hole 21h. The first core 11 does not have a first axial through hole 11h.

[0072] iii. In the above embodiments, it is described that the centers of the support members 3 into which the first axial through hole 11h and the second axial through hole 21h are inserted in any cross-section are located on the same perfect circle; however, this application is not limited to this. In other optional examples, in any cross-section, the center of the support member 3 into which the first iron core 11 is inserted can be located on the first perfect circle, while the center of the support member 3 into which the second iron core 21 is inserted can be located on the second perfect circle, with the centers of both the first and second perfect circles located on the central axis. It is understood that the difference between the diameters of the first and second perfect circles should be small, thereby reducing the adverse effect on the magnetic conductive area of ​​the iron core.

[0073] iv. It is understood that by adopting the solution according to this application, the power density and structural integration of the motor are improved, and the space occupied by the motor is significantly reduced. Moreover, due to the reduced space occupied by the motor, the layout of supporting components such as the housing and bearings can be made more compact.

[0074] Furthermore, in the scheme of this application, when multiple silicon steel sheets are stacked together by welding to form the first iron core 11 and the second iron core 21, the welding part (weld seam) can be located in the radial gap Rc, without welding at the air gap between the stator and the rotor, thus avoiding additional losses and reduced overall motor efficiency caused by welding at the aforementioned air gap. Alternatively, welding assistance can be used to achieve relative positioning of the first iron core 11 and the second iron core 21 in the axial direction A. In this scheme, the first iron core 11 and the second iron core 21 can be welded at the radial gap Rc, and the motor stator assembly can be further mounted to the motor housing using the mounting component 4.

[0075] Furthermore, compared with the scheme of two conjugate iron cores (whose yokes are integrated), in the scheme of this application, since two independently manufactured iron cores 11 and 21 are used, the process of installing windings on these two iron cores 11 and 21 is less difficult, which helps to simplify the assembly process and reduce the assembly difficulty.

[0076] v. The aforementioned support member 3 and mounting member 4 may be used solely for connecting and fixing the first stator 1 and the second stator 2. Alternatively, the aforementioned support member 3 or mounting member 4, or a portion thereof, may also be used directly or indirectly to connect the first stator 1 and / or the second stator 2 to a housing that houses the first stator 1 and the second stator 2. This housing may be a motor housing or, for example, a housing of an electric bridge drive system.

Claims

1. An electric machine stator assembly, characterized by, include: A first stator (1) includes a first iron core (11) and a first winding (12). The outer periphery of the first iron core (11) forms a plurality of first conductor slots (11c), and the first winding (12) is mounted in the plurality of first conductor slots (11c). The second stator (2) includes a second iron core (21) and a second winding (22). The inner circumference of the second iron core (21) is formed with a plurality of second conductor slots (21c). The second winding (22) is mounted in the plurality of second conductor slots (21c). The second iron core (21) is coaxially arranged with the first iron core (11) and located radially inside the first iron core (11). There is a radial gap (Rc) between the outer circumferential surface of the second iron core (21) and the inner circumferential surface of the first iron core (11) extending continuously along the circumferential direction (C) of the motor stator assembly. as well as Multiple support members (3) are spaced apart in the circumferential direction (C), each of the support members (3) being at least partially located in the radial gap (Rc) and simultaneously supporting the first iron core (11) and the second iron core (21) in the radial direction (R) of the motor stator assembly, such that the first iron core (11) and the second iron core (21) are not in direct contact and the magnetic field of the first stator (1) and the magnetic field of the second stator (2) are decoupled from each other.

2. The motor stator assembly of claim 1, wherein, The inner circumferential surface of the first iron core (11) has a first protrusion (111) that protrudes radially inward. The outer circumferential surface of the second iron core (21) has a second recess (212) that is recessed radially inward and has a shape complementary to the corresponding first protrusion (111). The first iron core (11) has a first axial through hole (11h) formed in the first protrusion (111), the first axial through hole (11h) has an opening that opens toward the second iron core (21), and the support member (3) is inserted into the first axial through hole (11h) and supports the second iron core (21) through the opening.

3. The motor stator assembly of claim 1, wherein, The inner circumferential surface of the first iron core (11) has a first recess (112) that is recessed radially outward. The outer circumferential surface of the second iron core (21) has a second protrusion (211) that protrudes radially outward and is complementary in shape to the corresponding first recess (112). The second iron core (21) has a second axial through hole (21h) formed in the second protrusion (211). The second axial through hole (21h) has an opening that opens toward the first iron core (11). The support member (3) is inserted into the second axial through hole (21h) and supports the first iron core (11) through the opening.

4. The motor stator assembly of claim 1, wherein, The inner circumferential surface of the first iron core (11) has a first recess (112) and a first protrusion (111). The first recess (112) is recessed radially outward, and the first protrusion (111) is protruded radially inward. The outer circumferential surface of the second iron core (21) has a second protrusion (211) and a second recess (212). The second recess (212) is recessed radially inward and its shape is complementary to that of the corresponding first protrusion (111). The second protrusion (211) is protruded radially outward and its shape is complementary to that of the corresponding first recess (112). The first iron core (11) has a first axial through hole (11h) formed in the first protrusion (111). The first axial through hole (11h) has a first opening that opens toward the second iron core (21). The support member (3) is inserted into the first axial through hole (11h) and supports the second iron core (21) through the first opening. The second iron core (21) has a second axial through hole (21h) formed in the second protrusion (211). The second axial through hole (21h) has a second opening that opens toward the first iron core (11). The support member (3) is inserted into the second axial through hole (21h) and supports the first iron core (11) through the second opening.

5. The motor stator assembly according to claim 4, characterized in that, The first recess (112) and the first protrusion (111) have complementary shapes, and The first recess (112) and the first protrusion (111) are evenly distributed alternately in the circumferential direction.

6. The motor stator assembly of any one of claims 2 to 5, wherein, In any cross-section of the motor stator assembly perpendicular to its central axis, The centers of the plurality of support members (3) are located on a perfect circle, the center of which is located on the central axis; or The center of the support member (3) inserted into the first iron core (11) is located on the first positive circle, and the center of the support member (3) inserted into the second iron core (21) is located on the second positive circle, which is different from the first positive circle. The center of the first positive circle and the center of the second positive circle are both located on the central axis.

7. The motor stator assembly of any one of claims 1 to 5, wherein, The radial clearance (Rc) has the same radial dimension at all positions along the entire circumference.

8. The motor stator assembly of any one of claims 1 to 5, wherein, It also includes a first end ring (5) and a second end ring (6). The first end ring (5) has a first mounting through hole (5h1) corresponding to the support member (3). The first end ring (5) is mounted on one axial side of the first iron core (11) and one axial side of the second iron core (21) via the support member (3). The first end ring (5) has a first circumferential groove (5c) that extends continuously around the entire circumference and communicates with the radial clearance (Rc). The second end ring (6) has a second mounting through hole (6h1) corresponding to the support member (3). The second end ring (6) is mounted on the other side of the first iron core (11) and the other side of the second iron core (21) via the support member (3). The second end ring (6) has a second circumferential groove (6c) that extends continuously around the circumference and communicates with the radial gap (Rc).

9. The motor stator assembly according to claim 8, characterized in that, The first end ring (5) is formed with a plurality of first injection holes (5h2) communicating with the first circumferential groove (5c). A portion of the plurality of first injection holes (5h2) are open toward the axial end of the first winding (12), and another portion of the plurality of first injection holes (5h2) are open toward the axial end of the second winding (22); and / or The second end ring (6) is formed with a plurality of second injection holes (6h2) communicating with the second circumferential groove (6c). A portion of the plurality of second injection holes (6h2) are open toward the other axial end of the first winding (12), and another portion of the plurality of first injection holes (5h2) are open toward the other axial end of the second winding (22).

10. An electric machine characterized by include: The motor stator assembly according to any one of claims 1 to 9; The first rotor (7) is located radially outside the first stator (1); as well as The second rotor (8) is located radially inside the second stator (2).

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