Rotor lamination, rotor core, rotor, wound field synchronous motor, and vehicle

Abstract

A vehicle. The vehicle comprises a wound field synchronous motor. The wound field synchronous motor comprises a rotor. The rotor comprises a rotor core. The rotor core comprises a rotor lamination. The rotor lamination comprises a yoke portion and a plurality of tooth portions. The plurality of tooth portions are arranged at the yoke portion and are distributed at intervals in the circumferential direction of the yoke portion. The at least one tooth portion is provided with first flux barrier slots. In the axial direction of the rotor lamination, the first flux barrier slots pass through the tooth portion where the first flux barrier slots are located.

Description

Rotor lamination, rotor core, rotor, electrically excited synchronous motor and vehicle

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on December 28, 2023, with application number 202311837935.0 and titled “Rotor Punchings, Rotor Core, Rotor, Electromagnetic Synchronous Motor and Vehicle,” the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of vehicle technology, and in particular to a rotor punching, a rotor core, a rotor, an electrically excited synchronous motor and a vehicle. Background Art

[0004] Currently, electrically excited wound synchronous motors do not use rare earth permanent magnets. Instead, they generate the rotor excitation magnetic field by passing direct current through the rotor windings. This approach is cost-effective, the magnitude of the rotor excitation current is controllable, and the speed regulation performance is good. Therefore, they are widely used in electric vehicles. However, during the operation of electrically excited synchronous motors, because the rotor excitation magnetic field is generated by energizing the windings, this generates additional copper loss. Furthermore, as the load increases, the rotor excitation current also needs to increase, which increases the rotor copper loss, reducing motor efficiency and affecting heat dissipation.

[0005] Public content

[0006] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present application is to provide a rotor punching that can increase the output reluctance torque of a motor and improve the efficiency of the motor.

[0007] The present application further proposes a rotor core.

[0008] The present application further proposes a rotor.

[0009] The present application further proposes an electrically excited synchronous motor.

[0010] The present application further proposes a vehicle.

[0011] According to the rotor punching of the present application, it includes: a yoke; and a plurality of teeth, wherein the plurality of teeth are arranged on the yoke and distributed at intervals in the circumferential direction of the yoke; wherein at least one of the teeth is provided with a first magnetic barrier groove, and the first magnetic barrier groove passes through the tooth along the axial direction of the rotor punching.

[0012] According to the rotor punching of the present application, a plurality of teeth are circumferentially spaced apart on the yoke, and a first magnetic barrier groove is provided on at least one tooth. Such an arrangement can increase the cross-axis magnetic resistance, thereby increasing the output magnetic resistance torque of the motor and improving the efficiency of the motor.

[0013] In some examples of the present application, the first magnetic barrier groove extends in a direction in which a center line of the tooth portion extends, and the center line of the tooth portion extends in a radial direction of the yoke portion.

[0014] In some examples of the present application, a center line of the tooth portion bisects the first magnetic barrier groove of the tooth portion.

[0015] In some examples of the present application, the dimension of the first magnetic barrier groove in a direction perpendicular to the center line of the tooth portion and the axial direction of the rotor punching is H1, and the dimension of the tooth portion in a direction perpendicular to its center line and the axial direction of the rotor punching is H2. H1 and H2 satisfy the relationship: H1=H2 / a, where 8.92≤a≤11.98.

[0016] In some examples of the present application, at least one of the teeth is provided with at least two first magnetic barrier grooves, and the at least two first magnetic barrier grooves are spaced apart in a direction perpendicular to a center line of the tooth and an axial direction of the rotor punching.

[0017] In some examples of the present application, the at least two first magnetic barrier grooves are symmetrically arranged about a center line of the tooth portion where they are located.

[0018] In some examples of the present application, the dimension of the first magnetic barrier groove in the direction perpendicular to the center line of the tooth portion and the axial direction of the rotor punching is H1, and the dimension of the tooth portion in the direction perpendicular to its center line and the axial direction of the rotor punching is H2; wherein, in the direction perpendicular to the center line of the tooth portion and the axial direction of the rotor punching, the spacing between two adjacent first magnetic barrier grooves is H3, and H1, H2 and H3 must satisfy the relationship: H3-n*H1=b*H2, wherein 1.82≤b≤2.18, n≥2, and n is the number of the at least two first magnetic barrier grooves.

[0019] In some examples of the present application, the tooth portion is provided with tooth shoulders on both sides in a direction perpendicular to its center line and the axial direction of the rotor punching, and the tooth shoulders are located at the end of the tooth portion away from the yoke portion, and the tooth shoulders have an inner edge facing the yoke portion; wherein, the end of the first magnetic barrier groove away from the yoke portion is located between the outer end edge of the tooth portion and the inner edge of the tooth shoulder.

[0020] In some examples of the present application, the first magnetic barrier groove extends to the yoke adjacent to one end of the yoke.

[0021] In some examples of the present application, the first magnetic barrier groove is a through groove extending from one end adjacent to the yoke to one end away from the yoke; or the first magnetic barrier groove is a broken groove with a blocking portion provided between one end adjacent to the yoke and one end away from the yoke, and the first magnetic barrier groove includes at least two sub-grooves separated by the blocking portion.

[0022] In some examples of the present application, the yoke is provided with at least one second magnetic barrier groove penetrating along the axial direction of the rotor punching.

[0023] In some examples of the present application, the second magnetic barrier groove has a center line extending in a radial direction of the yoke, and the center line bisects the second magnetic barrier groove along a circumferential direction of the yoke.

[0024] In some examples of the present application, in the circumferential direction of the yoke, the second magnetic barrier groove is located between the first magnetic barrier grooves of two adjacent teeth.

[0025] In some examples of the present application, the second magnetic barrier groove is spaced apart from the first magnetic barrier groove, and the second magnetic barrier groove is closer to the center of the yoke than the first magnetic barrier groove; or the tooth portion is provided with at least two of the first magnetic barrier grooves, and the second magnetic barrier groove is connected between two of the first magnetic barrier grooves that are close to each other in two adjacent teeth portions.

[0026] In some examples of the present application, a dimension of the second magnetic barrier groove in the direction in which the center line extends is the same as a dimension of the first magnetic barrier groove in a direction perpendicular to the center line of the tooth portion and the axial direction of the rotor punching.

[0027] The rotor core according to the present application includes: the rotor punching sheet mentioned above, a plurality of the rotor punching sheets are stacked.

[0028] The rotor according to the present application includes: the rotor core and a rotor shaft, wherein the rotor shaft is mounted on the rotor core.

[0029] The electrically excited synchronous motor according to the present application includes: the rotor described above.

[0030] The vehicle according to the present application includes: the electrically excited synchronous motor described above.

[0031] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0033] FIG1 is a schematic structural diagram of a first form of a single-layer magnetic barrier;

[0034] FIG2 is a schematic diagram of the partial structure of a single-layer magnetic barrier of the first form;

[0035] FIG3 is a schematic structural diagram of a second form of a single-layer magnetic barrier;

[0036] FIG4 is a schematic diagram of a partial structure of a second form of a single-layer magnetic barrier;

[0037] FIG5 is a schematic structural diagram of a first form of a double-layer magnetic barrier;

[0038] FIG6 is a schematic diagram of a partial structure of a first type of double-layer magnetic barrier;

[0039] FIG7 is a schematic structural diagram of a second form of a double-layer magnetic barrier;

[0040] FIG8 is a schematic diagram of a partial structure of a second type of double-layer magnetic barrier;

[0041] FIG9 is a schematic block diagram of a rotor core according to an embodiment of the present application;

[0042] FIG10 is a schematic block diagram of a rotor according to an embodiment of the present application;

[0043] FIG11 is a schematic block diagram of an electrically excited synchronous motor according to an embodiment of the present application;

[0044] FIG12 is a schematic block diagram of a vehicle according to an embodiment of the present application.

[0045] Reference numerals:

[0046] Vehicle 1000,

[0047] Electrically excited synchronous motor 100, rotor 200, rotor core 300, rotor shaft 310,

[0048] Rotor punching 10,

[0049] The yoke 20 , the second flux barrier slot 21 , the tooth 30 , the first flux barrier slot 31 , the sub-slot 301 , the tooth shoulder 32 , the rotor slot 33 , and the rotor winding 40 . DETAILED DESCRIPTION

[0050] The following describes in detail embodiments of the present application, and the embodiments described with reference to the accompanying drawings are exemplary.

[0051] A rotor punching 10 according to an embodiment of the present application will be described below with reference to FIG. 1 to FIG. 8 . The rotor punching 10 is applied to a vehicle, for example, an electric vehicle.

[0052] As shown in Figures 1-8, the rotor sheet 10 according to the present application includes a yoke 20 and a plurality of teeth 30. The plurality of teeth 30 are disposed on the yoke 20 and are spaced apart circumferentially of the yoke 20. Each tooth 30 has a centerline extending radially along the yoke 20. At least one tooth 30 is provided with a first magnetic barrier slot 31. The first magnetic barrier slot 31 extends through the tooth 30 in the axial direction of the rotor sheet 10 and extends in the direction in which the centerline of the tooth 30 extends.

[0053] It is understood that the yoke 20 and the plurality of teeth 30 constitute the main structure of the rotor lamination 10. The inner ends of the plurality of teeth 30 are connected to the yoke 20, and the plurality of teeth 30 are spaced apart, with adjacent teeth 30 having opposite polarities, namely, north (N) and south (S) poles. A first magnetic barrier slot 31 is provided on at least one tooth 30. The first magnetic barrier slot 31 is arranged along the radial direction of the corresponding tooth 30, and the centerline of the first magnetic barrier slot 31 along its extension direction can coincide with or be parallel to the centerline of the tooth 30. This arrangement allows the first magnetic barrier slot 31 and the tooth 30 to form a magnetic barrier. Furthermore, the rotor slots 33 formed on both sides of each tooth 30 can be used to accommodate rotor windings 40. The rotor windings 40 are positive and negative, respectively, and the positive and negative rotor windings 40 form a loop. Among them, the angle between the center line of the rotor pole and the center line of the first magnetic barrier slot 31 is α, α = 360 / p / 4 (p is the number of rotor pole pairs), so that the reluctance torque of the motor can be approximately proportional to the difference between the quadrature and direct axis inductances of the motor, thereby increasing the output reluctance torque of the motor.

[0054] Specifically, when the output torque remains unchanged, the proportion of reluctance torque is increased, which can reduce the excitation torque, and the corresponding excitation current and excitation loss are reduced at the same time, thereby improving the motor efficiency and torque density; when the rotor excitation current remains unchanged, that is, the excitation torque remains unchanged, the reluctance torque increases, and at the same time, by adjusting the corresponding angles between the direct and alternating axes of the reluctance torque and the direct and alternating axes of the DC excitation torque, the maximum value of the DC excitation torque and the maximum value of the reluctance torque can be superimposed at similar current phase angles, thereby achieving an improvement in torque utilization and an increase in total torque.

[0055] For example, each tooth 30 is provided with a first magnetic barrier groove 31, which can increase the magnetic resistance of the quadrature axis magnetic circuit and has little effect on the direct axis magnetic circuit, thereby increasing the difference between the quadrature and direct axis inductances of the motor. According to the motor torque formula: Tem=p[Ψ f i q +(L d -L q )i d i q ] (1)

[0056] In formula (1), p is the number of pole pairs, ψf is the magnetic linkage, i d is the direct axis current component, i q is the quadrature axis current component, L d is the direct axis inductance component of the stator winding, L q is the quadrature-axis inductance component of the stator winding.

[0057] From Equation (1), it can be seen that the output torque of an electromagnetic motor is composed of the excitation torque and the reluctance torque. The reluctance torque is approximately proportional to the difference between the motor's quadrature and direct axis inductances. Increasing the difference between the motor's quadrature and direct axis inductances can make the motor's tooth effect more pronounced, thereby increasing the saliency and improving the reluctance torque. When the output torque remains unchanged, increasing the reluctance torque ratio can reduce the excitation torque, and the corresponding excitation current and excitation loss can be reduced at the same time, thereby improving the motor efficiency and torque density.

[0058] Therefore, by arranging multiple teeth 30 at circumferential intervals on the yoke 20 and arranging a first magnetic barrier slot 31 on at least one tooth 30, such an arrangement can increase the cross-axis magnetic resistance, thereby increasing the output magnetic resistance torque of the motor, and improving the efficiency and torque density of the motor.

[0059] As shown in Figures 2 and 4 , the centerline of the tooth 30 bisects the first magnetic barrier slot 31 of the tooth 30. This means that the centerline of the first magnetic barrier slot 31 extending along its length coincides with the centerline of the tooth 30. This arrangement allows the first magnetic barrier slot 31 to extend radially along the centerline of the tooth 30, and the centerline of the first magnetic barrier slot 31 extending along its extension direction coincides with or is parallel to the centerline of the tooth 30. This increases the saliency ratio, reduces the width of the original direct-axis magnetic circuit, and exacerbates direct-axis magnetic circuit saturation, which in turn causes a decrease in excitation torque, thereby increasing the motor's output reluctance torque.

[0060] Optionally, as shown in Figures 2 and 4, the dimension of the first magnetic barrier slot 31 in a direction perpendicular to the centerline of the tooth portion 30 and the axial direction of the rotor sheet 10 is H1, and the dimension of the tooth portion 30 in a direction perpendicular to the centerline of the tooth portion 30 and the axial direction of the rotor sheet 10 is H2. H1 and H2 satisfy the relationship: H1 = H2 / a, where 8.92≤a≤11.98. In other words, the dimension of the first magnetic barrier slot 31 in a direction perpendicular to the centerline of the tooth portion 30 and the axial direction of the rotor sheet 10 is the width, and the dimension of the tooth portion 30 in a direction perpendicular to the centerline of the tooth portion 30 and the axial direction of the rotor sheet 10 is the extreme width. The ratio of the width of the first magnetic barrier slot 31 to the extreme width of the tooth portion 30 should be within a reasonable range, so as to balance the increase in reluctance torque and the decrease in excitation torque. This ratio cannot be less than 8.92 or greater than 11.98. If it is less than 8.92 or greater than 11.98, the reluctance of the quadrature-axis magnetic circuit will be reduced, and the motor's reluctance torque will also be reduced. If this ratio is within a reasonable range, it can increase the difference between the quadrature-axis and direct-axis inductances of the motor, thereby increasing the motor's reluctance torque. For example, when the output torque remains unchanged, increasing the reluctance torque ratio can reduce the excitation torque, and the corresponding excitation current and excitation losses will also be reduced, thereby improving motor efficiency and torque density.

[0061] Furthermore, as shown in Figures 5-8 , at least one tooth 30 is provided with at least two first magnetic barrier slots 31. The at least two first magnetic barrier slots 31 are spaced apart in a direction perpendicular to the centerline of the tooth 30 and the axial direction of the rotor lamination 10. It will be appreciated that the two first magnetic barrier slots 31 are spaced apart relative to the axial centerline of the tooth 30. This arrangement allows the first magnetic barrier slots 31 and the tooth 30 to form a double-layer magnetic barrier, thereby increasing the saliency ratio and reducing the width of the original direct-axis magnetic circuit. This also exacerbates direct-axis magnetic circuit saturation and causes a decrease in excitation torque, thereby ensuring maximum total output torque.

[0062] In particular, as shown in Figures 5 to 8, at least two first magnetic barrier slots 31 are symmetrically arranged about the center line of the tooth portion 30. This arrangement can make the two first magnetic barrier slots 31 on the tooth portion 30 equidistant from the center line of the tooth portion 30, thereby forming a symmetrical structure of the double-layer magnetic barrier, and further ensuring the maximum output total torque.

[0063] Optionally, as shown in Figures 6 and 8 , the dimension of the first magnetic barrier slot 31 in a direction perpendicular to the centerline of the tooth 30 and the axial direction of the rotor sheet 10 is H1, and the dimension of the tooth 30 in a direction perpendicular to its centerline and the axial direction of the rotor sheet 10 is H2. The spacing between two adjacent first magnetic barrier slots 31 in a direction perpendicular to the centerline of the tooth 30 and the axial direction of the rotor sheet 10 is H3. H1, H2, and H3 must satisfy the relationship: H3-n*H1=b*H2, where 1.82≤b≤2.18, n≥2, and n is the number of at least two first magnetic barrier slots 31. In other words, the relationship between H1, H2, and H3 must be within a reasonable range, and the value of n must be an integer greater than or equal to 2. If within a reasonable range, the reluctance of the quadrature-axis magnetic circuit can be increased while having a minimal impact on the direct-axis magnetic circuit. This means that the difference between the quadrature and direct-axis inductances of the motor increases, thereby increasing the reluctance torque of the motor. For example, when the output torque remains unchanged, increasing the proportion of reluctance torque can reduce the excitation torque, and the corresponding excitation current and excitation loss will also decrease, thereby improving the motor efficiency and torque density.

[0064] In some examples of the present application, as shown in FIG2 and FIG4 , a tooth portion 30 is provided with tooth shoulders 32 on both sides thereof in a direction perpendicular to its centerline and the axial direction of the rotor sheet 10. The tooth shoulders 32 are located at the end of the tooth portion 30 away from the yoke 20, and the tooth shoulders 32 have an inner edge facing the yoke 20. The end of the first magnetic barrier slot 31 away from the yoke 20 is located between the outer edge of the tooth portion 30 and the inner edge of the tooth shoulders 32. It is understood that the end of the tooth portion 30 away from the yoke 20 is the outer end, and the end of the tooth portion 30 closer to the yoke 20 is the inner end. The tooth shoulders 32 are located at the outer end of the tooth portion 30, and the width of the tooth shoulders 32 is greater than the width of the tooth portion 30, so that the tooth shoulders 32 can protect the tooth portion 30, thereby extending the service life of the tooth portion 30. The first magnetic barrier slot 31 is located within the tooth portion 30, and the outer end of the first magnetic barrier slot 31 is also located within the tooth shoulder 32, so that the center line of the first magnetic barrier slot 31 extending radially along the yoke 20 coincides with the center line of the tooth portion 30, thereby increasing the output reluctance torque of the motor.

[0065] Furthermore, as shown in Figures 1-8 , one end of the first magnetic barrier slot 31 adjacent to the yoke 20 extends to the yoke 20, that is, the inner end of the first magnetic barrier slot 31 extends to the yoke 20. This arrangement extends the length of the first magnetic barrier slot 31, allowing it to act as a magnetic barrier between the rotor windings on both sides, thereby increasing the quadrature-axis magnetic resistance and further enhancing the output reluctance torque of the motor.

[0066] In particular, as shown in Figures 1 to 8, the first magnetic barrier slot 31 is a through slot extending from one end adjacent to the yoke 20 to one end away from the yoke 20; or the first magnetic barrier slot 31 is a broken slot with a blocking portion provided between one end adjacent to the yoke 20 and one end away from the yoke 20, and the first magnetic barrier slot 31 includes at least two sub-slots 301 separated by the blocking portion.

[0067] In other words, the first magnetic barrier slot 31 is a through slot extending from the inner end to the outer end, or a broken slot with a blocking portion provided between the inner and outer ends. The first magnetic barrier slot 31 can be a through slot or a broken slot. Furthermore, the broken slot is divided into at least two sub-slots 301 along the centerline of the tooth portion 30, thereby increasing the number of possible arrangements of the first magnetic barrier slot 31. The rotor lamination 10 can select the appropriate type of first magnetic barrier slot 31 based on actual needs to meet the requirements.

[0068] In addition, as shown in Figures 1-8, the yoke 20 is provided with at least one second magnetic barrier slot 21 extending axially through the rotor sheet 10. The second magnetic barrier slot 21 has a centerline extending radially along the yoke 20, and the centerline bisects the second magnetic barrier slot 21 along the circumferential direction of the yoke 20. It will be understood that the second magnetic barrier slots 21 are arranged on the yoke 20 at intervals in the circumferential direction, and the second magnetic barrier slots 21 are close to the inner ends of the first magnetic barrier slots 31. This arrangement can increase the quadrature-axis magnetic resistance, reduce the quadrature-axis inductance, and increase the difference between the quadrature-axis and direct-axis inductances, thereby making the reluctance torque of the motor approximately proportional to the difference between the quadrature-axis and direct-axis inductances of the motor, thereby increasing the output reluctance torque of the motor and improving the motor efficiency.

[0069] In particular, as shown in Figures 1 to 8, in the circumferential direction of the yoke 20, the second magnetic barrier slot 21 is located between the first magnetic barrier slots 31 of two adjacent teeth 30. This arrangement makes the second magnetic barrier slot 21 close to the first magnetic barrier slot 31, and can also increase the cross-axis magnetic resistance between the two teeth 30, and reduce the cross-axis inductance and increase the difference between the quadrature and direct-axis inductances.

[0070] In addition, as shown in Figures 1 to 8, the second magnetic barrier groove 21 is spaced apart from the first magnetic barrier groove 31, and the second magnetic barrier groove 21 is closer to the center of the yoke 20 than the first magnetic barrier groove 31; or the tooth portion 30 is provided with at least two first magnetic barrier grooves 31, and the second magnetic barrier groove 21 is connected between two first magnetic barrier grooves 31 close to each other in two adjacent tooth portions 30.

[0071] That is, the second magnetic barrier slots 21 are located near the center of the main body 20, are located inside the inner ends of the first magnetic barrier slots 31, and are staggered with the first magnetic barrier slots 31. This ensures a certain spacing between the second magnetic barrier slots 21 and the first magnetic barrier slots 31, thereby ensuring the structural reliability of the rotor lamination 10. Alternatively, the second magnetic barrier slots 21 and the first magnetic barrier slots 31 are connected, so that the second magnetic barrier slots 21 and the first magnetic barrier slots 31 are directly connected, thereby improving the magnetic barrier effect and further increasing the quadrature-axis magnetic resistance.

[0072] The second magnetic barrier slots 21 of these two configurations can both achieve the effect of increasing the quadrature-axis magnetic resistance. The rotor sheet 10 can select a suitable type of the second magnetic barrier slots 21 according to actual conditions to meet corresponding requirements.

[0073] In addition, as shown in Figures 1-8 , the dimensions of the second magnetic barrier slot 21 in the direction extending from its centerline are identical to the dimensions of the first magnetic barrier slot 31 in a direction perpendicular to the centerline of the tooth 30 in which it is located and the axial direction of the rotor sheet 10. In other words, the width of the second magnetic barrier slot 21 is identical to the width of the first magnetic barrier slot 31. This arrangement facilitates the manufacture of the second magnetic barrier slot 21 and the first magnetic barrier slot 31, particularly in the arrangement in which the second magnetic barrier slot 21 and the first magnetic barrier slot 31 are connected. Furthermore, by unifying the widths of the second magnetic barrier slot 21 and the first magnetic barrier slot 31, it is possible to avoid varying magnetic barrier effects due to inconsistent widths, which could affect rotor performance.

[0074] The rotor core 300 according to the embodiment of the present application includes: rotor sheets 10 according to any of the above embodiments, with multiple rotor sheets 10 stacked as shown in FIG9 . This can increase the output reluctance torque of the motor and improve the efficiency and torque density of the motor.

[0075] The rotor 200 according to the embodiment of the present application comprises: the rotor core 300 and the rotor shaft 310 of the above embodiment, wherein the rotor shaft 310 is mounted on the rotor core 300, as shown in Figure 10. The rotor 200 thus configured can improve the efficiency and torque density of the motor.

[0076] The electrically excited synchronous motor 100 according to the embodiment of the present application includes: the rotor 200 of the above embodiment, as shown in Figure 11. The motor configured in this way can improve the efficiency and torque density of the motor.

[0077] The vehicle 1000 according to the embodiment of the present application includes: the electrically excited synchronous motor 100 of the above embodiment, as shown in Figure 12. The motor of the vehicle 1000 configured in this way can improve the efficiency and torque density of the motor.

[0078] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0079] In the description of the present application, "first feature" and "second feature" may include one or more of the features. In the description of the present application, "plurality" means two or more. In the description of the present application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. In the description of the present application, the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.

[0080] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0081] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and purpose of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A rotor punching sheet (10), characterized in that, Comprising: A yoke portion (20); And A plurality of tooth portions (30), the plurality of tooth portions (30) being disposed on the yoke portion (20) and circumferentially spaced apart on the yoke portion (20); Wherein, at least one of the tooth portions (30) is provided with a first magnetic barrier groove (31), and the first magnetic barrier groove (31) axially penetrates the corresponding tooth portion (30) along the axial direction of the rotor punching sheet (10).

2. The rotor punching sheet (10) according to claim 1, characterized in that, The first magnetic barrier groove (31) extends in a direction along the center line of the corresponding tooth portion (30), and the center line of the tooth portion (30) extends radially along the yoke portion (20).

3. The rotor punching sheet (10) according to claim 2, characterized in that, The center line of the tooth portion (30) bisects the first magnetic barrier groove (31) of the tooth portion (30).

4. The rotor punching sheet (10) according to claim 2 or 3, characterized in that, The dimension of the first magnetic barrier groove (31) in a direction perpendicular to the center line of the corresponding tooth portion (30) and the axial direction of the rotor punching sheet (10) is H1, and the dimension of the tooth portion (30) in a direction perpendicular to its center line and the axial direction of the rotor punching sheet (10) is H2, and H1 and H2 satisfy the relationship: H1 = H2 / a, wherein, 8.92 ≤ a ≤ 11.

98.

5. The rotor punching sheet (10) according to claim 1, characterized in that, At least one of the tooth portions (30) is provided with at least two of the first magnetic barrier grooves (31), and the at least two first magnetic barrier grooves (31) are spaced apart in a direction perpendicular to the center line of the corresponding tooth portion (30) and the axial direction of the rotor punching sheet (10).

6. The rotor punching sheet (10) according to claim 5, characterized in that, The at least two first magnetic barrier grooves (31) are symmetrically disposed with respect to the center line of the corresponding tooth portion (30).

7. The rotor punching sheet (10) according to claim 5 or 6, characterized in that, The dimension of the first magnetic barrier groove (31) in a direction perpendicular to the center line of the corresponding tooth portion (30) and the axial direction of the rotor punching sheet (10) is H1, and the dimension of the tooth portion (30) in a direction perpendicular to its center line and the axial direction of the rotor punching sheet (10) is H2; Wherein, in a direction perpendicular to the center line of the corresponding tooth portion (30) and the axial direction of the rotor punching sheet (10), the spacing between two adjacent ones of the first magnetic barrier grooves (31) is H3, and H1, H2 and H3 need to satisfy the relationship: H3 - n*H1 = b*H2, wherein, 1.82 ≤ b ≤ 2.18, n ≥ 2, and n is the number of the at least two first magnetic barrier grooves (31).

8. The rotor punching sheet (10) according to any one of claims 1-7, characterized in that, On both sides of the tooth portion (30) in a direction perpendicular to its center line and the axial direction of the rotor punching sheet (10), there are provided tooth shoulders (32), the tooth shoulders (32) being located at an end of the tooth portion (30) remote from the yoke portion (20), and the tooth shoulders (32) having inner edges facing the yoke portion (20); Wherein, the end of the first magnetic barrier groove (31) remote from the yoke portion (20) is located between the outer edge of the corresponding tooth portion (30) and the inner edge of the tooth shoulder (32).

9. The rotor punching sheet (10) according to any one of claims 1-8, characterized in that, The end of the first magnetic barrier groove (31) adjacent to the yoke portion (20) extends to the yoke portion (20).

10. The rotor punching sheet (10) according to any one of claims 1-9, characterized in that, The first magnetic barrier groove (31) is a through groove penetrating from the end adjacent to the yoke portion (20) to the end remote from the yoke portion (20); or The first magnetic barrier groove (31) is a broken groove provided with a blocking portion between one end adjacent to the yoke portion (20) and the other end away from the yoke portion (20), and the first magnetic barrier groove (31) includes at least two sub-grooves (301) separated by the blocking portion.

11. The rotor punching sheet (10) according to any one of claims 1-10, characterized in that, The yoke portion (20) is provided with at least one second magnetic barrier groove (21) penetrating axially along the rotor punching (10).

12. The rotor punching sheet (10) according to claim 11, characterized in that, The second magnetic barrier groove (21) has a center line extending radially along the yoke portion (20), and the center line bisects the second magnetic barrier groove (21) circumferentially along the yoke portion (20).

13. The rotor punching sheet (10) according to claim 11 or 12, characterized in that, Circumferentially on the yoke portion (20), the second magnetic barrier groove (21) is located between the first magnetic barrier grooves (31) of two adjacent tooth portions (30).

14. The rotor punching sheet (10) according to any one of claims 11-13, characterized in that, The second magnetic barrier groove (21) is spaced from the first magnetic barrier groove (31), and the second magnetic barrier groove (21) is closer to the center of the yoke portion (20) than the first magnetic barrier groove (31); or The tooth portion (30) is provided with at least two of the first magnetic barrier grooves (31), and the second magnetic barrier groove (21) is connected between two of the first magnetic barrier grooves (31) that are adjacent to each other and close to each other in two adjacent tooth portions (30).

15. The rotor punching sheet (10) according to any one of claims 11-14, characterized in that, The dimension of the second magnetic barrier groove (21) in the direction of the extension of the center line is the same as the dimension of the first magnetic barrier groove (31) in the direction perpendicular to the center line of the tooth portion (30) where it is located and the axial direction of the rotor punching (10).

16. A rotor core (300), characterized in that, Comprising: A plurality of rotor punchings (10) according to any one of claims 1-15, and the plurality of rotor punchings (10) are stacked.

17. A rotor (200), characterized in that, Comprising: A rotor core (300) according to claim 16; And A rotor shaft (310), and the rotor shaft (310) is mounted on the rotor core (300).

18. An electrically excited synchronous motor (100), characterized in that, Comprising: A rotor (200) according to claim 17.

19. A vehicle (1000), characterized in that, An electric excitation synchronous motor (100) comprising according to claim 18.

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