Motor assembly and vehicle

Abstract

This invention discloses a motor assembly and a vehicle, relating to the field of vehicle manufacturing technology. The motor assembly includes: a stator structure with stator windings mounted on it; an inner rotor structure and an outer rotor structure, the stator structure being sleeved outside the inner rotor structure and the outer rotor structure being sleeved outside the stator structure. The stator windings are used to rotate the inner rotor structure and / or the outer rotor structure when energized. The inner rotor structure has multiple first magnetic poles that cooperate with the stator windings, and the outer rotor structure has multiple second magnetic poles that cooperate with the stator windings, the number of second magnetic poles being twice the number of first magnetic poles. According to the motor assembly of this invention, the mutual cooperation of the stator structure, inner rotor structure, and outer rotor structure enables the configuration of a dual-rotor motor, improving torque density, achieving higher integration, and lower cost. Furthermore, by setting the number of second magnetic poles to twice the number of first magnetic poles to effectively alleviate magnetic circuit saturation, torque density can be further increased by 5%.

Description

Technical Field

[0001] This invention relates to the field of vehicle manufacturing technology, and more particularly to an electric motor assembly and a vehicle having the electric motor assembly. Background Technology

[0002] In related technologies, traditional motor structures drive the rotation of the inner and outer rotor structures through the cooperation of two adjusting magnetic rings. This results in a large volume and low torque density, leaving room for improvement. Summary of the Invention

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a motor assembly that is smaller in size, has higher space utilization, and has higher torque density.

[0004] According to an embodiment of the present invention, a motor assembly includes: a stator structure on which a stator winding is mounted; an inner rotor structure and an outer rotor structure, wherein the stator structure is sleeved outside the inner rotor structure, and the outer rotor structure is sleeved outside the stator structure; the stator winding is used to rotate the inner rotor structure and / or the outer rotor structure when energized; wherein the inner rotor structure is provided with a plurality of first magnetic poles cooperating with the stator winding, and the outer rotor structure is provided with a plurality of second magnetic poles cooperating with the stator winding, the number of second magnetic poles being twice the number of first magnetic poles.

[0005] According to the motor assembly of the present invention, a dual-rotor motor can be configured by the cooperation of the stator structure, the inner rotor structure and the outer rotor structure, which reduces the size, increases the torque density, has higher integration, and lower cost. Furthermore, by setting the number of the second magnetic poles to twice that of the first magnetic poles to effectively alleviate magnetic circuit saturation, the torque density can be further increased by 5%.

[0006] According to some embodiments of the present invention, the stator structure has a plurality of inner stator slots that are spaced apart circumferentially and open inwards on its inner side, and an inner stator tooth is provided between two adjacent inner stator slots. The stator structure has a plurality of outer stator slots that are spaced apart circumferentially and open outwards on its outer side, and an outer stator tooth is provided between two adjacent outer stator slots. The stator winding includes a plurality of inner stator windings and a plurality of outer stator windings. The plurality of inner stator windings are respectively disposed in the plurality of inner stator slots and respectively cooperate with a plurality of first magnetic poles. The plurality of outer stator windings are respectively disposed in the plurality of outer stator slots and respectively cooperate with a plurality of second magnetic poles.

[0007] According to some embodiments of the present invention, the motor assembly satisfies at least one of the following: The first magnetic pole is spaced apart from the inner peripheral wall of the stator structure and together define an inner air gap, and the inner stator slot is open toward the inner air gap; The second magnetic pole is spaced apart from the outer peripheral wall of the stator structure and together defines an outer air gap, with the outer stator slot opening toward the outer air gap.

[0008] According to some embodiments of the present invention, the motor assembly satisfies at least one of the following: The average air gap magnetic load of the inner air gap is Bσ1, the inner diameter of the stator structure is D1, the length of the inner air gap is σ1, the number of inner stator slots is Zs1, the magnetic flux density of the inner stator teeth is Bt1, and the tooth width of the inner stator teeth is bt1, and satisfies: Bσ1*(D1 / 2-σ1 / 2)=Bt1*Zs1*bt1; The average air gap magnetic load of the outer air gap is Bσ2, the outer diameter of the stator structure is D2, the length of the outer air gap is σ2, the number of outer stator slots is Zs2, the magnetic flux density of the outer stator teeth is Bt2, and the tooth width of the outer stator teeth is bt2, and satisfies: Bσ2*(D2 / 2-σ2 / 2)=Bt2*Zs2*bt2.

[0009] According to some embodiments of the present invention, the motor assembly satisfies at least one of the following: The inner stator slot has a slot width of bs1, the inner stator tooth width is bt1, the number of inner stator slots is Zs1, the inner diameter of the stator structure is D1, the radial height of the slot opening of the inner stator slot is h01, and the radial height inside the slot of the inner stator slot is hg1, and satisfies: (bs1+bt1)*Zs1≈π*(D1+2*(h01+1 / 3*hg1)). The width of the outer stator slot is bs2, the width of the outer stator tooth is bt2, the number of outer stator slots is Zs2, the outer diameter of the stator structure is D2, the radial height of the slot opening of the outer stator slot is h02, the radial height inside the slot of the outer stator slot is hg2, and the length of the outer air gap is σ2, and satisfies: (bs2+bt2)*Zs2≈π*D2-2*(h02+1 / 3*hg2+2*σ2).

[0010] According to some embodiments of the present invention, the motor assembly satisfies at least one of the following: The magnetic flux density of the inner stator teeth is Bt1, the number of inner stator slots is Zs1, the tooth width of the inner stator teeth is bt1, the number of poles of the inner rotor structure is 2P, the magnetic flux density of the inner stator yoke thickness of the stator structure is Bj1, and the equivalent yoke thickness of the inner stator structure is hj1, and satisfies: Bt1*Zs1*bt1 / 2P=Bj1*hj1; The magnetic flux density of the outer stator teeth is Bt2, the number of outer stator slots is Zs2, the tooth width of the outer stator teeth is bt2, the number of poles of the outer rotor structure is 4P, the magnetic flux density of the outer stator yoke of the stator structure is Bj2, and the equivalent yoke thickness of the outer stator of the stator structure is hj2, and satisfies: Bt2*Zs2*bt2 / 4P=Bj2*hj2.

[0011] According to some embodiments of the present invention, the motor assembly satisfies at least one of the following: The slot width of the inner stator slot is bs1, the number of layers of the inner stator winding is Cr1, the current density of the inner stator winding is J1, and satisfies: Cr1=bs1*hg1 / J1. The slot width of the outer stator slot is bs2, the number of layers of the outer stator winding is Cr2, the current density of the outer stator winding is J2, and satisfies: Cr2=bs2*hg2 / J2.

[0012] According to some embodiments of the present invention, the motor assembly satisfies at least one of the following: The inner diameter of the stator structure is D1, the outer diameter of the stator structure is D2, the radial height inside the inner stator slot is hg1, the radial height inside the outer stator slot is hg2, the radial height at the opening of the inner stator slot is h01, the radial height at the opening of the outer stator slot is h02, and the radial thickness of the yoke of the stator structure is hj, and satisfies: D2=D1+2*(hg1+hg2+h01+h02+hj).

[0013] According to some embodiments of the present invention, the number of slots per pole per phase of the inner stator winding is q1, the number of inner stator slots is Zs1, the number of poles of the inner rotor structure is 2P, and the number of phases of the motor assembly is m, and satisfies: q1=Zs1 / (2mp).

[0014] The present invention also proposes a vehicle.

[0015] The vehicle according to embodiments of the present invention includes the motor assembly described in any of the above embodiments.

[0016] The vehicle and the aforementioned motor assembly have the same advantages over the prior art, which will not be repeated here.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1This is a schematic diagram of the motor assembly according to an embodiment of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the motor assembly according to an embodiment of the present invention. Figure 2 .

[0019] Figure label: Motor assembly 100, Stator structure 1, stator winding 11, inner stator winding 111, outer stator winding 112, inner stator slot 12, inner stator tooth 13, outer stator slot 14, outer stator tooth 15. Internal rotor structure 2, first magnetic pole 21, internal air gap 22, magnet 23, shaft hole 24. The outer rotor structure 3 has a second magnetic pole 31 and an outer air gap 32. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0021] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] The following is for reference. Figures 1-2The motor assembly 100 described according to an embodiment of the present invention is smaller in size, has higher space utilization, and has higher torque density.

[0023] like Figures 1-2 As shown, the motor assembly 100 according to an embodiment of the present invention includes: a stator structure 1, an inner rotor structure 2, and an outer rotor structure 3.

[0024] The stator structure 1 is equipped with a stator winding 11. That is, the stator winding 11 can be fixed relative to the stator structure 1 so that the stator structure 1 can drive the inner rotor structure 2 and the outer rotor structure 3 to move. For example, the stator winding 11 can be energized, thereby generating a magnetic field in the stator winding 11, and then applying a driving force to the outer rotor structure 3 or the inner rotor structure 2 through the magnetic field, thereby realizing the rotation of the inner rotor structure 2 or the outer rotor structure 3.

[0025] Stator structure 1 is fitted outside inner rotor structure 2, and outer rotor structure 3 is fitted outside stator structure 1. Stator winding 11 is used to rotate inner rotor structure 2 and / or outer rotor structure 3 when energized. That is, inner rotor structure 2, stator structure 1, and outer rotor structure 3 can be arranged radially from the inside to the outside, meaning that inner rotor structure 2 and outer rotor structure 3 are both driven by the same stator structure 1. When stator winding 11 is energized, it can generate a magnetic field that moves outer rotor structure 3, at which point outer rotor structure 3 is located within the magnetic field and rotates under its drive; it can also generate a magnetic field that moves inner rotor structure 2, at which point inner rotor structure 2 is located within the magnetic field and rotates under its drive; or it can simultaneously generate a magnetic field that rotates both outer rotor structure 3 and inner rotor structure 2, at which point both inner rotor structure 2 and outer rotor structure 3 can rotate under the drive of the magnetic field. Therefore, by controlling the energization of the stator winding 11, the rotation of the inner rotor structure 2 or the outer rotor structure 3 can be flexibly controlled, which helps to improve the efficiency of the motor assembly 100.

[0026] The inner rotor structure 2 has multiple first magnetic poles 21 that cooperate with the stator winding 11, and the outer rotor structure 3 has multiple second magnetic poles 31 that cooperate with the stator winding 11. The number of second magnetic poles 31 is twice that of the first magnetic poles 21. That is to say, the number of first magnetic poles 21 can be set to two, three, or more, and the specific setting is flexible. Similarly, the number of second magnetic poles 31 can be set to two, three, or more, and the specific setting is flexible.

[0027] Specifically, eight first magnetic poles 21 can be set on the inner rotor structure 2. The eight first magnetic poles 21 can cooperate with the stator winding 11. When the stator winding 11 generates a magnetic field that causes the inner rotor structure 2 to rotate, the first magnetic poles 21 generate a driving force under the action of the magnetic field, thereby driving the inner rotor structure 2 to rotate. Sixteen second magnetic poles 31 can be set on the outer rotor structure 3. The sixteen second magnetic poles 31 can cooperate with the stator winding 11. When the stator winding 11 generates a magnetic field that causes the outer rotor structure 3 to rotate, the second magnetic poles 31 generate a driving force under the action of the magnetic field, thereby driving the outer rotor structure 3 to rotate. Therefore, the magnetic field can drive the first magnetic pole 21 and the second magnetic pole 31 to move, thereby driving the inner rotor structure 2 and the outer rotor structure 3 to rotate. It should be noted that the first magnetic pole 21 and the second magnetic pole 31 are both provided with N pole and S pole, and the N pole and S pole are a pair of magnetic poles. That is, the eight first magnetic poles 21 are four pairs of N poles and S poles, and the sixteen second magnetic poles 31 are eight pairs of N poles and S poles. When the magnetic field drives the first magnetic pole 21 and the second magnetic pole 31, the pair of N poles and S poles cooperate to generate torque to drive the inner rotor structure 2 or the outer rotor structure 3 to rotate.

[0028] Furthermore, compared to the traditional structure, the number of second magnetic poles 31 is twice that of the first magnetic poles 21, which can effectively alleviate magnetic circuit saturation and thus improve torque density, such as increasing torque density by 5%.

[0029] Therefore, by sequentially nesting the inner rotor structure 2, stator structure 1, and outer rotor structure 3 radially from the inside out, the structure can have a smaller volume, improve space utilization and integration, reduce costs, and further improve torque density by setting the number of second magnetic poles 31 to twice that of the first magnetic poles 21.

[0030] Furthermore, when the inner rotor structure 2 or the outer rotor structure 3 is actively driven to rotate by external force and the stator winding 11 is energized, if the inner rotor structure 2 is connected to the engine, the engine drives the inner rotor structure 2 to rotate in the magnetic field, thereby generating an induced current in the inner rotor structure 2. At this time, the inner rotor structure 2 acts as a generator, and the outer rotor structure 3 can rotate under the drive of the magnetic field to act as a drive motor, so that the motor assembly 100 is suitable for various vehicle types such as pure electric and hybrid.

[0031] According to the embodiment of the present invention, the motor assembly 100 can realize the setting of a dual rotor motor by the mutual cooperation of the stator structure 1, the inner rotor structure 2 and the outer rotor structure 3, which reduces the volume, increases the torque density, has higher integration, and lower cost. Furthermore, by setting the number of the second magnetic poles 31 to twice that of the first magnetic poles 21 to effectively alleviate magnetic circuit saturation, the torque density can be further increased by 5%.

[0032] In some embodiments, the stator structure 1 has a plurality of inner stator slots 12 that are spaced apart circumferentially and open inwards on its inner side, and an inner stator tooth 13 is provided between two adjacent inner stator slots 12. The stator structure 1 has a plurality of outer stator slots 14 that are spaced apart circumferentially and open outwards on its outer side, and an outer stator tooth 15 is provided between two adjacent outer stator slots 14. The stator winding 11 includes a plurality of inner stator windings 111 and a plurality of outer stator windings 112. The plurality of inner stator windings 111 are respectively disposed in the plurality of inner stator slots 12 and respectively cooperate with a plurality of first magnetic poles 21. The plurality of outer stator windings 112 are respectively disposed in the plurality of outer stator slots 14 and respectively cooperate with a plurality of second magnetic poles 31. In other words, the inner stator winding 111 and the outer stator winding 112 can be used to cooperate with the first magnetic pole 21 and the second magnetic pole 31 respectively. The inner stator slot 12, the outer stator slot 14, the inner stator winding 111 and the outer stator winding 112 can all be set to two, three or more, and the specific number can be flexibly selected.

[0033] Specifically, such as Figures 1-2 As shown, the number of inner stator slots 12 can be set to forty-eight, and the forty-eight inner stator slots 12 are distributed circumferentially on the inner side of the stator structure 1. The inner stator slots 12 are open inward, and there are inner stator teeth 13 between two adjacent inner stator slots 12, that is, there are forty-eight inner stator teeth 13. There are also forty-eight inner stator windings 111, and the inner stator windings 111 are arranged one-to-one in the inner stator slots 12. At this time, the inner stator windings 111 can cooperate with the first magnetic pole 21. When the inner stator windings 111 are energized, the inner stator windings 111 generate a magnetic field to drive the first magnetic pole 21 to rotate the inner stator structure 1.

[0034] Furthermore, the number of outer stator slots 14 can be set to seventy-two, and the seventy-two outer stator slots 14 are distributed circumferentially on the outer side of the stator structure 1. The outer stator slots 14 are open outward, and an outer stator tooth 15 is provided between two adjacent outer stator slots 14, that is, there are seventy-two outer stator teeth 15. The number of outer stator windings 112 is also set to seventy-two, and the outer stator windings 112 are arranged one-to-one in the outer stator slots 14. At this time, the outer stator windings 112 can cooperate with the second magnetic pole 31. When the outer stator windings 112 are energized, the outer stator windings 112 generate a magnetic field to drive the second magnetic pole 31 to drive the outer stator structure 1 to rotate. The fact that the number of outer stator slots 14 is greater than the number of inner stator slots 12 can increase the heat dissipation area of ​​the motor assembly 100, which is beneficial for heat dissipation and can thus improve the peak torque and continuous torque by 3%.

[0035] Therefore, the inner stator winding 111 and the outer stator winding 112 can drive the first magnetic pole 21 and the second magnetic pole 31, thereby driving the inner stator structure 1 and the outer stator structure 1 to rotate. The inner stator winding 111 and the outer stator winding 112 are independent structures, so the inner stator structure 1 and the outer stator structure 1 can be independently controlled by the inner stator winding 111 and the outer stator winding 112 respectively.

[0036] In some embodiments, the motor assembly 100 satisfies at least one of the following: The first magnetic pole 21 is spaced apart from the inner peripheral wall of the stator structure 1 and together defines the inner air gap 22, with the inner stator slot 12 opening towards the inner air gap 22. Specifically, as Figures 1-2 As shown, the inner peripheral wall of the stator structure 1 is spaced apart from the first magnetic pole 21, thus forming an inner air gap 22. The magnetic field generated by the stator structure 1 can be transmitted to the inner air gap 22, causing the first magnetic pole 21 to be located within the magnetic field. This allows the first magnetic pole 21 to sense the changing magnetic field, thereby driving the inner rotor structure 2 to rotate. The inner stator slot 12 is open towards the inner air gap 22, allowing the magnetic field generated by the inner stator winding 111 within the slot to be transmitted to the inner air gap 22. This facilitates the interaction between the magnetic field and the first magnetic pole 21, thereby driving the inner rotor structure 2 or inducing a current in the inner rotor structure 2.

[0037] The second magnetic pole 31 is spaced apart from the outer peripheral wall of the stator structure 1 and together defines the outer air gap 32, with the outer stator slot 14 opening towards the outer air gap 32. Specifically, as shown... Figures 1-2 As shown, the outer peripheral wall of the stator structure 1 is spaced apart from the second magnetic pole 31, thus forming an outer air gap 32. The magnetic field generated by the stator structure 1 can be transmitted to the outer air gap 32, causing the second magnetic pole 31 to be located within the magnetic field. This allows the second magnetic pole 31 to sense the changing magnetic field, thereby driving the outer rotor structure 3 to rotate. The outer stator slot 14 is open towards the outer air gap 32, allowing the magnetic field generated by the outer stator winding 112 within the slot to be transmitted to the outer air gap 32. This facilitates the interaction between the magnetic field and the second magnetic pole 31, thereby driving the outer rotor structure 3 or inducing a current in the outer rotor structure 3.

[0038] Therefore, by setting the inner air gap 22 and the outer air gap 32, the magnetic field can be matched with the first magnetic pole 21 or the second magnetic pole 31, thereby driving the outer rotor structure 3 and the inner rotor structure 2 or generating induced current, so that one of the outer rotor structure 3 and the inner rotor structure 2 can be used as a generator and the other as a drive motor.

[0039] In some embodiments, the motor assembly 100 satisfies at least one of the following: The average air gap magnetic load of the inner air gap 22 is Bσ1, the inner diameter of the stator structure 1 is D1, the length of the inner air gap 22 is σ1, the number of inner stator slots 12 is Zs1, the magnetic flux density of the inner stator teeth 13 is Bt1, and the tooth width of the inner stator teeth 13 is bt1, satisfying: Bσ1*(D1 / 2-σ1 / 2)=Bt1*Zs1*bt1. Here, the average air gap magnetic load of the inner air gap 22 and the magnetic flux density of the inner stator teeth 13 are equivalent to the average air gap magnetic flux density of the inner air gap 22 and the magnetic flux density of the inner stator teeth 13, respectively. In other words, the average air gap magnetic flux density of the inner air gap 22 is Bσ1, and the magnetic flux density of the inner stator teeth 13 is Bt1, satisfying Bσ1*(D1 / 2-σ1 / 2)=Bt1*Zs1*bt1. This effectively controls the magnetic saturation of the inner stator teeth 13, ensuring the rational utilization of the magnetic circuit, and thus helps to reduce the temperature and volume of the motor assembly 100.

[0040] The average air gap magnetic load of the outer air gap 32 is Bσ2, the outer diameter of the stator structure 1 is D2, the length of the outer air gap 32 is σ2, the number of outer stator slots 14 is Zs2, the magnetic flux density of the outer stator teeth 15 is Bt2, and the tooth width of the outer stator teeth 15 is bt2, satisfying: Bσ2*(D2 / 2-σ2 / 2)=Bt2*Zs2*bt2. Here, the average air gap magnetic load of the outer air gap 32 and the magnetic flux density of the outer stator teeth 15 are equivalent to the average air gap magnetic flux density of the outer air gap 32 and the magnetic flux density of the outer stator teeth 15, respectively. In other words, the average air gap magnetic flux density of the outer air gap 32 is Bσ2 and the magnetic flux density of the outer stator teeth 15 is Bt2, satisfying Bσ2*(D2 / 2-σ2 / 2)=Bt2*Zs2*bt2. This effectively controls the magnetic saturation of the outer stator teeth 15, ensuring the rational utilization of the magnetic circuit, and thus helps to reduce the temperature and volume of the motor assembly 100.

[0041] Therefore, by ensuring that the average air gap magnetic load Bσ1 of the inner air gap 22, the inner diameter D1 of the stator structure 1, the length σ1 of the inner air gap 22, the number Zs1 of the inner stator slots 12, the magnetic flux density Bt1 of the inner stator teeth 13, and the tooth width bt1 of the inner stator teeth 13 satisfy Bσ1*(D1 / 2-σ1 / 2)=Bt1*Zs1*bt1, and by ensuring that the average air gap magnetic load Bσ2 of the outer air gap 32, the outer diameter D2 of the stator structure 1, the length σ2 of the outer air gap 32, the number Zs2 of the outer stator slots 14, the magnetic flux density Bt2 of the outer stator teeth 15, and the tooth width bt2 of the outer stator teeth 15 satisfy Bσ2*(D2 / 2-σ2 / 2)=Bt2*Zs2*bt2, the magnetic saturation of the inner stator teeth 13 and the outer stator teeth 15 can be effectively controlled, ensuring the rational utilization of the magnetic circuit, and thus helping to reduce the temperature and volume of the motor assembly 100.

[0042] In some embodiments, the motor assembly 100 satisfies at least one of the following: The slot width of the inner stator slot 12 is bs1, the tooth width of the inner stator tooth 13 is bt1, the number of inner stator slots 12 is Zs1, the inner diameter of the stator structure 1 is D1, the radial height of the slot opening of the inner stator slot 12 is h01, and the radial height inside the slot of the inner stator slot 12 is hg1, and satisfies: (bs1+bt1)*Zs1≈π*(D1+2*(h01+1 / 3*hg1).

[0043] The width of the outer stator slot 14 is bs2, the width of the outer stator tooth 15 is bt2, the number of outer stator slots 14 is Zs2, the outer diameter of the stator structure 1 is D2, the radial height of the slot opening of the outer stator slot 14 is h02, the radial height inside the slot of the outer stator slot 14 is hg2, and the length of the outer air gap 32 is σ2, and satisfies: (bs2+bt2)*Zs2≈π*D2-2*(h02+1 / 3*hg2+2*σ2).

[0044] In this context, the thickness of the varnish and insulating paper is ignored, i.e., the insulating varnish layer coated on the winding surface and the insulating material on the inner wall of the stator slot are ignored. The following parameters are used to ensure that the slot width bs1 of the inner stator slot 12, the tooth width bt1 of the inner stator tooth 13, the number of inner stator slots Zs1, the inner diameter D1 of the stator structure 1, the radial height h01 of the slot opening of the inner stator slot 12, and the radial height hg1 of the inner stator slot 12 satisfy (bs1+bt1)*Zs1≈π*(D1+2*(h01+1 / 3*hg1), and the slot width bs2 of the outer stator slot 14, and the tooth width bt1 of the outer stator tooth 13 are all within the specified range. The tooth width bt2 of stator 5, the number of outer stator slots 14 Zs2, the outer diameter D2 of stator structure 1, the radial height h02 of the slot opening of outer stator slot 14, the radial height hg2 of the slot inside outer stator slot 14, and the length σ2 of outer air gap 32 satisfy (bs2+bt2)*Zs2≈π*D2-2*(h02+1 / 3*hg2+2*σ2), which can achieve the coordinated optimization of the tooth width of inner stator tooth 13 and inner stator slot 12, and the coordinated optimization of the tooth width of outer stator tooth 15 and outer stator slot 14, thereby reducing the material consumption in processing and manufacturing and reducing costs.

[0045] In some embodiments, the motor assembly 100 satisfies at least one of the following: The magnetic flux density of the inner stator tooth 13 is Bt1, the number of inner stator slots 12 is Zs1, the tooth width of the inner stator tooth 13 is bt1, the number of poles of the inner rotor structure 2 is 2P, the magnetic flux density of the inner stator yoke of the stator structure 1 is Bj1, and the equivalent inner stator yoke thickness of the stator structure 1 is hj1, and satisfies: Bt1*Zs1*bt1 / 2P=Bj1*hj1. The magnetic flux density of the inner stator teeth 13 and the magnetic flux density of the inner stator yoke of the stator structure 1 are equivalent to the magnetic flux density of the inner stator teeth 13 and the magnetic flux density of the inner stator yoke of the stator structure 1. In other words, the magnetic flux density of the inner stator teeth 13 is Bt1 and the magnetic flux density of the inner stator yoke of the stator structure 1 is Bj1, satisfying Bt1*Zs1*bt1 / 2P=Bj1*hj1. Furthermore, P is the number of pole pairs of the first magnetic pole 21. For example, if there are eight first magnetic poles 21, the value of P is four, and the inner rotor structure 2 can be a two-pole motor. Therefore, by limiting the magnetic flux density of the inner stator teeth 13 and the magnetic flux density of the inner stator yoke of the stator structure 1, local magnetic circuit saturation can be further reduced, and material consumption can be decreased.

[0046] The magnetic flux density of the outer stator tooth 15 is Bt2, the number of outer stator slots 14 is Zs2, the tooth width of the outer stator tooth 15 is bt2, the number of poles of the outer rotor structure 3 is 4P, the magnetic flux density of the outer stator yoke of the stator structure 1 is Bj2, and the equivalent outer stator yoke thickness of the stator structure 1 is hj2, and satisfies: Bt2*Zs2*bt2 / 4P=Bj2*hj2. The magnetic flux density of the outer stator teeth 15 and the magnetic flux density of the outer stator yoke of the stator structure 1 are equivalent to the magnetic flux density of the outer stator teeth 15 and the magnetic flux density of the outer stator yoke of the stator structure 1. In other words, the magnetic flux density of the outer stator teeth 15 is Bt2 and the magnetic flux density of the outer stator yoke of the stator structure 1 is Bj2, satisfying Bt2*Zs2*bt2 / 4P=Bj2*hj2. Furthermore, P is the number of pole pairs of the second magnetic pole 31. For example, if there are sixteen second magnetic poles 31, the value of P is four, and the outer rotor structure 3 can be a four-pole motor. Therefore, by limiting the magnetic flux density of the outer stator teeth 15 and the magnetic flux density of the outer stator yoke of the stator structure 1, local magnetic circuit saturation can be further reduced, and material consumption can be reduced.

[0047] Where hj1+hj2=hj, that is, the sum of the equivalent yoke thickness of the outer stator and the equivalent yoke thickness of the inner stator is the radial thickness of the yoke of stator structure 1.

[0048] Therefore, both the inner stator structure 1 and the outer stator structure 1 can reduce local magnetic circuit saturation, thereby significantly reducing material consumption.

[0049] In some embodiments, the motor assembly 100 satisfies at least one of the following: The inner stator slot 12 has a slot width of bs1, the inner stator winding 111 has a layer count of Cr1, and the current density of the inner stator winding 111 is J1, satisfying: Cr1=bs1*hg1 / J1; the outer stator slot 14 has a slot width of bs2, the outer stator winding 112 has a layer count of Cr2, and the current density of the outer stator winding 112 is J2, satisfying: Cr2=bs2*hg2 / J2.

[0050] Among them, the current density J1 of the inner stator winding 111 and the current density J2 of the outer stator winding 112 affect the total heat generation of the motor assembly 100, and the value of the current density J1 of the inner stator winding 111 can be in the range of 25~35. That is, the current density J1 of the inner stator winding 111 can be 25 A / 26 A / 28 A / 30 A / 33 A / 35 A / Or it could be 25~35 Other values ​​within the inner rotor structure 1 can be flexibly selected. Furthermore, the outer rotor structure 3, mounted outside the stator structure 1, has a larger heat dissipation area compared to the inner rotor structure 2, thus allowing the current density J2 of the outer stator winding 112 to be set to a range of 35~45. That is, the current density J2 of the outer stator winding 112 can be 35. 36 38 39 41 44 45 Or it could be 35~45 Other values ​​within. And, such as Figures 1-2 As shown, the inner stator winding 111 can be set to five layers, and the outer stator winding 112 can be set to eight layers.

[0051] Therefore, by limiting the slot width bs1 of the inner stator slot 12, the number of layers Cr1 of the inner stator winding 111, the current density J1 of the inner stator winding 111, and the radial height hg1 of the inner stator slot 12, as well as limiting the slot width bs2 of the outer stator slot 14, the number of layers Cr2 of the outer stator winding 112, the current density J2 of the outer stator winding 112, and the radial height hg2 of the outer stator slot 14, the slot cross-sectional area can be matched with the winding conductor cross-sectional area, thereby reducing material consumption.

[0052] In some embodiments, the motor assembly 100 satisfies at least one of the following: The inner diameter of stator structure 1 is D1, the outer diameter of stator structure 1 is D2, the radial height inside the inner stator slot 12 is hg1, the radial height inside the outer stator slot 14 is hg2, the radial height of the slot opening of the inner stator slot 12 is h01, the radial height of the slot opening of the outer stator slot 14 is h02, and the radial thickness of the yoke of stator structure 1 is hj, and satisfies: D2=D1+2*(hg1+hg2+h01+h02+hj).

[0053] Therefore, by ensuring that the inner diameter D1, outer diameter D2, inner stator slot 12 radial height hg1, outer stator slot 14 radial height hg2, inner stator slot 12 radial height h01, outer stator slot 14 radial height h02, and yoke radial thickness hj of stator structure 1 satisfy D2=D1+2*(hg1+hg2+h01+h02+hj), the inner diameter, outer diameter, inner stator slot 12 radial height, and outer stator slot 14 radial height can be limited, thereby reducing the volume of the motor assembly 100.

[0054] In some embodiments, the number of slots per pole per phase of the inner stator winding 111 is q1, the number of inner stator slots 12 is Zs1, the number of poles of the inner rotor structure 2 is 2P, the number of phases of the motor assembly 100 is m, and the number of slots per pole per phase of the outer stator winding 112 is q2, and satisfies: q1=Zs1 / (2mp), q2≈(1~1.5)*q1.

[0055] In other words, the number of slots per pole and per phase of the inner stator winding 111 (q1), the number of inner stator slots 12 (Zs1), the number of poles of the inner rotor structure 2 (2P), the number of phases of the motor assembly 100 (m), and the number of slots per pole and per phase of the outer stator winding 112 (q2) can satisfy q1=Zs1 / (2mp), thereby ensuring the symmetry of the electromotive force and magnetomotive force of the windings and reducing phase imbalance and abnormal circulating current. The number of phases m of the motor assembly 100 can be set to three, meaning the motor assembly 100 is a three-phase motor. The number of outer stator slots 14 (q2≈(1~1.5)*q1) can be increased to increase the heat dissipation area, thereby improving the heat dissipation efficiency of the motor assembly 100.

[0056] In some embodiments, the current in the inner stator winding 111 is I1 = hg1 / Cr1*bs1*J, the current in the outer stator winding 112 is I2 = hg2 / Cr2*bs2*J, and the number of parallel branches in the inner stator is a1, the number of parallel branches in the outer stator is a2, the number of single-phase series turns in the inner stator is N1, the number of single-phase series turns in the outer stator is N2, the line load in the inner stator is A1, the line load in the outer stator is A2, and satisfies N1 = Cr1*Zs1 / (2ma1), N2 = Cr2*Zs2 / (2ma2), A1 = 2mN1*(I1*a1) / (π*D1), A2 = 2mN2*(I2*a2) / (π*D2), with Furthermore, since the outer rotor structure 3 has more magnetic poles than the inner rotor structure 2, it can effectively alleviate magnetic circuit saturation, thereby outputting greater torque and accommodating more line loads or magnetic loads within the same structural volume. In this case, A2≈(1.5~2)*D2 / D1*A1, where the current I1 of the inner stator winding 111, the current I2 of the outer stator winding 112, the number of parallel branches of the inner stator a1, and the number of parallel branches of the outer stator a2 can be determined by the inverter input characteristics and the output characteristic requirements of the motor assembly 100. Thus, by determining the input of the motor assembly 100, the size range of the motor assembly 100 and parameters such as the inner air gap 22 and the outer air gap 32 can be determined.

[0057] In some embodiments, the inner rotor structure 2 is further provided with a magnet 23 and a shaft hole 24, the first magnetic pole 21 can be installed on the magnet 23, and the inner rotor structure 2 can rotate around the shaft hole 24.

[0058] The present invention also proposes a vehicle.

[0059] The vehicle according to an embodiment of the present invention includes a motor assembly 100 of any of the above embodiments. The stator structure 1, inner rotor structure 2, and outer rotor structure 3 cooperate to achieve a dual-rotor motor configuration, reducing size, increasing torque density, achieving higher integration, and lower cost. Furthermore, by setting the number of second magnetic poles 31 to twice that of the first magnetic poles 21 to effectively alleviate magnetic circuit saturation, torque density can be further increased by 5%.

[0060] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, system, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, systems, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0061] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A motor assembly, characterized in that, include: Stator structure (1), wherein stator structure (1) is equipped with stator winding (11); The inner rotor structure (2) and the outer rotor structure (3) are provided, wherein the stator structure (1) is sleeved outside the inner rotor structure (2) and the outer rotor structure (3) is sleeved outside the stator structure (1), and the stator winding (11) is used to rotate the inner rotor structure (2) and / or the outer rotor structure (3) when energized. The inner rotor structure (2) is provided with a plurality of first magnetic poles (21) that cooperate with the stator winding (11), and the outer rotor structure (3) is provided with a plurality of second magnetic poles (31) that cooperate with the stator winding (11). The number of second magnetic poles (31) is twice that of the first magnetic poles (21).

2. The motor assembly according to claim 1, characterized in that, The stator structure (1) has a plurality of inner stator slots (12) that are spaced apart circumferentially and open inwards on its inner side. An inner stator tooth (13) is provided between two adjacent inner stator slots (12). The stator structure (1) has a plurality of outer stator slots (14) that are spaced apart circumferentially and open outwards on its outer side. An outer stator tooth (15) is provided between two adjacent outer stator slots (14). The stator winding (11) includes a plurality of inner stator windings (111) and a plurality of outer stator windings (112). The plurality of inner stator windings (111) are respectively disposed in the plurality of inner stator slots (12) and respectively cooperate with a plurality of first magnetic poles (21). The plurality of outer stator windings (112) are respectively disposed in the plurality of outer stator slots (14) and respectively cooperate with a plurality of second magnetic poles (31).

3. The motor assembly according to claim 2, characterized in that, At least one of the following must be met: The first magnetic pole (21) is spaced apart from the inner peripheral wall of the stator structure (1) and together defines an inner air gap (22), and the inner stator slot (12) is open toward the inner air gap (22); The second magnetic pole (31) is spaced apart from the outer peripheral wall of the stator structure (1) and together defines an outer air gap (32), and the outer stator slot (14) is open toward the outer air gap (32).

4. The motor assembly according to claim 3, characterized in that, At least one of the following must be met: The average air gap magnetic load of the inner air gap (22) is Bσ1, the inner diameter of the stator structure (1) is D1, the length of the inner air gap (22) is σ1, the number of inner stator slots (12) is Zs1, the magnetic flux density of the inner stator teeth (13) is Bt1, and the tooth width of the inner stator teeth (13) is bt1, and satisfies: Bσ1*(D1 / 2-σ1 / 2)=Bt1*Zs1*bt1; The average air gap magnetic load of the outer air gap (32) is Bσ2, the outer diameter of the stator structure (1) is D2, the length of the outer air gap (32) is σ2, the number of outer stator slots (14) is Zs2, the magnetic flux density of the outer stator teeth (15) is Bt2, and the tooth width of the outer stator teeth (15) is bt2, and satisfies: Bσ2*(D2 / 2-σ2 / 2)=Bt2*Zs2*bt2.

5. The motor assembly according to claim 3, characterized in that, At least one of the following must be met: The slot width of the inner stator slot (12) is bs1, the tooth width of the inner stator tooth (13) is bt1, the number of inner stator slots (12) is Zs1, the inner diameter of the stator structure (1) is D1, the radial height of the slot opening of the inner stator slot (12) is h01, and the radial height inside the slot of the inner stator slot (12) is hg1, and satisfies: (bs1+bt1)*Zs1≈π*(D1+2*(h01+1 / 3*hg1); The width of the outer stator slot (14) is bs2, the width of the outer stator tooth (15) is bt2, the number of outer stator slots (14) is Zs2, the outer diameter of the stator structure (1) is D2, the radial height of the slot opening of the outer stator slot (14) is h02, the radial height inside the slot of the outer stator slot (14) is hg2, and the length of the outer air gap (32) is σ2, and satisfies: (bs2+bt2)*Zs2≈π*D2-2*(h02+1 / 3*hg2+2*σ2).

6. The motor assembly according to claim 2, characterized in that, At least one of the following must be met: The magnetic flux density of the inner stator tooth (13) is Bt1, the number of inner stator slots (12) is Zs1, the tooth width of the inner stator tooth (13) is bt1, the number of poles of the inner rotor structure (2) is 2P, the magnetic flux density of the inner stator yoke of the stator structure (1) is Bj1, and the equivalent yoke thickness of the inner stator of the stator structure (1) is hj1, and satisfies: Bt1*Zs1*bt1 / 2P=Bj1*hj1; The magnetic flux density of the outer stator teeth (15) is Bt2, the number of outer stator slots (14) is Zs2, the tooth width of the outer stator teeth (15) is bt2, the number of poles of the outer rotor structure (3) is 4P, the magnetic flux density of the outer stator yoke of the stator structure (1) is Bj2, the equivalent yoke thickness of the outer stator of the stator structure (1) is hj2, and satisfies: Bt2*Zs2*bt2 / 4P=Bj2*hj2.

7. The motor assembly according to claim 2, characterized in that, At least one of the following must be met: The slot width of the inner stator slot (12) is bs1, the number of layers of the inner stator winding (111) is Cr1, the current density of the inner stator winding (111) is J1, and satisfies: Cr1=bs1*hg1 / J1. The slot width of the outer stator slot (14) is bs2, the number of layers of the outer stator winding (112) is Cr2, the current density of the outer stator winding (112) is J2, and satisfies: Cr2=bs2*hg2 / J2.

8. The motor assembly according to claim 2, characterized in that, At least one of the following must be met: The inner diameter of the stator structure (1) is D1, the outer diameter of the stator structure (1) is D2, the inner radial height of the inner stator slot (12) is hg1, the inner radial height of the outer stator slot (14) is hg2, the radial height of the slot opening of the inner stator slot (12) is h01, the radial height of the slot opening of the outer stator slot (14) is h02, and the radial thickness of the yoke of the stator structure (1) is hj, and satisfies: D2=D1+2*(hg1+hg2+h01+h02+hj).

9. The motor assembly according to claim 2, characterized in that, The number of slots per pole and per phase of the inner stator winding (111) is q1, the number of inner stator slots (12) is Zs1, the number of poles of the inner rotor structure (2) is 2P, and the number of phases of the motor assembly is m, and satisfies: q1=Zs1 / (2mp).

10. A vehicle, characterized in that, The motor assembly included in any one of claims 1-9.

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