Rotor lamination, motor rotor, motor, drive assembly, and vehicle

Abstract

A rotor lamination, a motor rotor, a motor, a drive assembly, and a vehicle. The rotor lamination comprises a lamination body; the lamination body is provided with a plurality of magnet steel mounting portions; the plurality of magnet steel mounting portions are arranged at intervals in the circumferential direction of the lamination body; each magnet steel mounting portion among the plurality of magnet steel mounting portions comprises a first group of magnet steel slots; the first group of magnet steel slots comprises a plurality of magnet steel slots; and the lamination body between two adjacent magnet steel slots among the plurality of magnet steel slots is formed as a first reinforcing portion. The contour of the first group of magnet steel slots facing away from the center of the lamination body is a first contour, and the contour of the first group of magnet steel slots facing toward the center of the lamination body is a second contour; and a region enclosed by the first contour, the second contour, and the outer contour of the lamination body is a first region, the area of the first group of magnet steel slots is S1, and the area of the first reinforcing portion in the first region is S2, S1 and S2 satisfying: 0.13≤S2 / S1≤0.2.

Description

Rotor laminations, motor rotors, motors, drive assemblies and vehicles

[0001] This application claims priority to Chinese patent application No. 202510315669.8, filed on March 17, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of motor technology, and in particular to a rotor lamination, a motor rotor, a motor, a drive assembly, and a vehicle. Background Technology

[0003] Permanent magnet synchronous motors are widely used in electric vehicles. The motor is one of the core components of the electric drive system, and the overall performance of the motor directly affects the performance of the electric vehicle. Therefore, the performance requirements for motors are becoming increasingly stringent, especially in terms of efficiency, power density, and dynamic response. Summary of the Invention

[0004] In a first aspect, a rotor lamination is provided, comprising: a lamination body, the lamination body having a plurality of magnet mounting portions arranged at intervals along the circumference of the lamination body, each of the plurality of magnet mounting portions including a first set of magnet slots, the first set of magnet slots including a plurality of magnet slots, the lamination body between two adjacent magnet slots forming a first reinforcing portion; the contour of the first set of magnet slots away from the center of the lamination body is a first contour, the contour of the first set of magnet slots towards the center of the lamination body is a second contour, the area enclosed by the first contour, the second contour and the outer contour of the lamination body is a first region, the area of ​​the first set of magnet slots is S1, the area of ​​the first reinforcing portion in the first region is S2, and S1 and S2 satisfy: 0.13≤S2 / S1≤0.2.

[0005] According to some embodiments of the present disclosure, the rotor laminations are designed such that the area S1 of the first set of magnet slots and the area S2 of the first reinforcing part in the first region satisfy: 0.13≤S2 / S1≤0.2. In this way, when the rotor laminations are designed in a topology, if it is necessary to increase the amount of magnets to increase the power of the motor, the area of ​​the first reinforcing part will also increase accordingly as the area of ​​the magnets increases. This can improve the mechanical strength of the rotor laminations and prevent the rotor laminations from being unable to bear the stress generated by the motor at high speed after the power is increased. Thus, the rotor laminations can meet the performance requirements of the motor to achieve both high power and high speed at the same time.

[0006] In some embodiments, S1 and S2 satisfy: 0.15≤S2 / S1≤0.18.

[0007] In some embodiments, the area of ​​the first region is S0, and S0, S1, and S2 satisfy: 0.70≤(S1+S2) / S0≤0.85.

[0008] In some embodiments, S0, S1, and S2 satisfy: 0.72≤(S1+S2) / S0≤0.81.

[0009] In some embodiments, the length of the first reinforcing part is L1, the width of the first set of magnetic grooves is W1, and L1 and W1 satisfy: 1.5≤W1 / L1≤2.2.

[0010] In some embodiments, the length L1 of the first reinforcing part and the width W1 of the first set of magnet grooves satisfy at least one of the following: the size L1 of the first reinforcing part satisfies: 3.7mm≤L1≤4.8mm; and the width W1 of the first set of magnet grooves satisfies: 7.2mm≤W1≤8.2mm.

[0011] In some embodiments, the length L1 of the first reinforcing part and the width W1 of the first set of magnet grooves satisfy at least one of the following: the size L1 of the first reinforcing part satisfies: 4.4mm≤L1≤4.6mm; and the width W1 of the first set of magnet grooves satisfies: 7.2mm≤W1≤7.8mm.

[0012] In some embodiments, the magnet mounting portion includes a first portion, a second portion, and a third portion arranged sequentially along the circumference of the lamination body; the first set of magnet slots includes a first magnet slot, at least one second magnet slot, and a third magnet slot, wherein the first magnet slot is located in the first portion, at least one second magnet slot is located in the second portion, and the third magnet slot is located in the third portion.

[0013] In some optional embodiments, the first reinforcing part includes a first reinforcing rib and a third reinforcing rib, the first reinforcing rib being located between a first magnet groove and at least one second magnet groove, and the third reinforcing rib being located between at least one second magnet groove and a third magnet groove.

[0014] In some embodiments, at least one second magnet slot includes at least two second magnet slots.

[0015] In some embodiments, the first reinforcing part further includes a second reinforcing rib, which is located between two adjacent second magnet slots in at least two second magnet slots.

[0016] In some embodiments, the first magnet groove and the third magnet groove have an included angle θ1, where θ1 satisfies: 110°≤θ1≤120°.

[0017] In some embodiments, the lamination body is provided with a shaft hole. In the radial direction of the lamination body, the distance between the second contour and the edge of the shaft hole is M1, and the distance between the outer contour of the lamination body and the edge of the shaft hole is M2. M1 and M2 satisfy: 0.4≤M1 / M2≤0.61.

[0018] In some embodiments, the magnet mounting portion further includes a second set of magnet slots, which are located radially outside the first set of magnet slots.

[0019] In some embodiments, the second magnet groove includes a plurality of magnet grooves, and the lamination body between two adjacent magnet grooves is formed as a second reinforcing part.

[0020] The outline of the second set of magnet slots away from the center of the lamination body is the third outline, and the outline of the second set of magnet slots facing the center of the lamination body is the fourth outline. The area enclosed by the third outline, the fourth outline, and the outer outline of the lamination body is the second region. The area of ​​the second set of magnet slots is S4, and the area of ​​the second reinforcing part in the second region is S5. S4 and S5 satisfy: 0.13≤S5 / S4≤0.2.

[0021] In some embodiments, the area of ​​the second region is S3, and S3, S4 and S5 satisfy: (S4+S5) / S3≤(S1+S2) / S0.

[0022] In a second aspect, a motor rotor is provided, which includes magnets and rotor laminations of any of the above-mentioned technical solutions, wherein the magnets are disposed in magnet slots.

[0023] Since the motor rotors provided in some embodiments of this disclosure include the rotor laminations described above, both can solve the same technical problems and achieve the same effects.

[0024] Thirdly, an electric motor is provided, comprising the rotor laminations described above; or, the motor rotor described above.

[0025] Since the motors provided in some embodiments of this disclosure include the rotor laminations or motor rotors described above, both can solve the same technical problems and achieve the same effects.

[0026] Fourthly, a drive assembly is provided, including the motor rotor described above, or the motor described above.

[0027] Since the drive assemblies provided in some embodiments of this disclosure include the motors described above, both can solve the same technical problems and achieve the same effects.

[0028] Fifthly, a vehicle is provided, including the aforementioned electric motor or the aforementioned drive assembly.

[0029] Since the vehicles of some embodiments of this disclosure include the drive assembly described above, both can solve the same technical problems and achieve the same effects. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of some embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 is a partial structural diagram of an electronic rotor according to some embodiments;

[0032] Figure 2 is a partial structural diagram of a rotor lamination according to some embodiments;

[0033] Figure 3 is a schematic diagram of the first and second regions of the rotor lamination according to some embodiments;

[0034] Figure 4 shows the power of an electric motor as a function of the area of ​​the first set of magnet slots according to some embodiments.

[0035] Figure 5 shows the curve of the maximum torque of an electric motor as a function of the area of ​​the first set of magnet slots according to some embodiments;

[0036] Figure 6 is a curve showing the change of motor power as a function of the area of ​​the first set of magnet slots and the area of ​​the first reinforcing part in the first region as a percentage of the area in the first region, according to some embodiments.

[0037] Figure 7 shows the curves showing the change in the area of ​​the first reinforcing part according to some embodiments as a function of the area of ​​the first set of magnetic steel grooves and the area ratio of the first reinforcing part in the first region to the area in the first region.

[0038] Figure 8 is a simulation diagram of a partial structure of a rotor lamination according to some embodiments;

[0039] Figure 9 is another simulation diagram of a partial structure of a rotor lamination according to some embodiments;

[0040] Figure 10 is another simulation diagram of a partial structure of a rotor lamination according to some embodiments;

[0041] Figure 11 is another simulation diagram of a partial structure of a rotor lamination according to some embodiments;

[0042] Figure 12 is a simulation diagram of a rotor lamination in a related technology;

[0043] Figure 13 is another simulation diagram of a partial structure of a rotor lamination according to some embodiments;

[0044] Figure 14 is a graph showing the relationship between the stress at the first reinforcing part of a rotor lamination according to some embodiments and the ratio of the distance between the second profile and the edge of the shaft hole, and the distance between the outer profile of the lamination body and the edge of the shaft hole.

[0045] Figure 15 is a schematic diagram of a vehicle according to some embodiments.

[0046] Reference numerals: 1000, vehicle; 100, rotor lamination; 1, lamination body; 11, outer contour of lamination body; 2, magnet mounting part; 21, first group of magnet slots; 211, first magnet slot; 212, second magnet slot; 213, third magnet slot; 214, first contour; 215, second contour; 22, second group of magnet slots; 225, fourth magnet slot; 221, fifth magnet slot; 222, sixth magnet slot; 223, third contour; 224, fourth contour; 23, first reinforcing part; 231, first reinforcing rib; 232, second reinforcing rib; 233, third reinforcing rib; 24, second reinforcing part; 241, fourth reinforcing rib; 242, fifth reinforcing rib; 3, first region; 4, second region; 5, stress buffer groove; 6, rotor yoke; 7, shaft hole; 200, magnet. Detailed Implementation

[0047] In some embodiments of this disclosure, the terms "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," "third," "fourth," "fifth," and "sixth" may explicitly or implicitly include one or more of that feature.

[0048] In some embodiments of this disclosure, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0049] "A and / or B" includes the following three combinations: A only, B only, and a combination of A and B.

[0050] In some embodiments of this disclosure, "parallel," "perpendicular," and "equal" include the described situation and situations that are similar to the described situation, within an acceptable deviation range, which is determined by those skilled in the art taking into account the measurement under discussion and the error associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein an acceptable deviation range for approximate parallelism may be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, wherein an acceptable deviation range for approximate perpendicularity may also be, for example, a deviation within 5°. "Equal" includes absolute equality and approximate equality, wherein an acceptable deviation range for approximate equality may be, for example, a difference between the two equals being less than or equal to 5% of either one.

[0051] In related technologies, the power of a motor is increased by changing the amount of magnets used in the motor. However, increasing the amount of magnets reduces the mechanical strength of the motor rotor laminations, which limits the motor speed. As a result, the rotor laminations cannot meet the performance requirements of the motor to achieve both high power and high speed at the same time.

[0052] To address the aforementioned problems, some embodiments of this disclosure provide a rotor lamination, a motor rotor, a motor, a drive assembly, and a vehicle.

[0053] Next, the rotor lamination 100 and the rotor of some embodiments of this disclosure will be described with reference to Figures 1-3. It should be noted that the dashed areas in the figures represent the areas of the magnet slots.

[0054] Referring to Figures 1-3, the rotor lamination 100 includes a lamination body 1. The lamination body 1 is provided with a plurality of magnet mounting portions 2 arranged at intervals along the circumference of the lamination body 1. The magnet mounting portion 2 includes a first set of magnet slots 21. The first set of magnet slots 21 includes a plurality of magnet slots. The lamination body 1 between two adjacent magnet slots forms a first reinforcing portion 23. That is, the portion of the lamination body 1 located between two adjacent magnet slots of the first set of magnet slots 21 forms the first reinforcing portion 23.

[0055] The outline of the first set of magnet slots 21 that is away from the center of the lamination body 1 is the first outline 214, and the outline that faces the center of the lamination body 1 is the second outline 215. The area enclosed by the first outline 214, the second outline 215, and the outer outline 11 of the lamination body is the first region 3. For example, the first reinforcing part 23 may be partially located within the first region 3 and partially located outside the first region 3.

[0056] The area of ​​the first set of magnetic steel grooves 21 is S1, and the area of ​​the first reinforcing part 23 in the first region 3 is S2. S1 and S2 satisfy: 0.13≤S2 / S1≤0.2.

[0057] It should be noted that the first region 3 is the area enclosed by the straight line containing the first contour 214 and the straight line containing the second contour 215, together with the outer contour 11 of the sheet body.

[0058] It should be noted that the magnetic slot is the magnet 200 used to accommodate the electronic rotor. The area of ​​the magnetic slot can also be characterized by the size of the magnet 200. Therefore, the area of ​​the magnetic slot can be calculated by measuring the size of the magnet 200.

[0059] Rotor lamination 100 refers to a thin metal sheet used to manufacture the rotor core of an electric motor, for example, it can be made of silicon steel. These metal sheets are stamped into shape using precision molds and then stacked together to form the rotor core of the electric motor.

[0060] In some embodiments, the number of magnet mounting portions 2 arranged circumferentially along the lamination body 1 is six or eight, etc.

[0061] In some embodiments, the plurality of magnetic grooves of the first set of magnetic grooves 21 are arranged along a convex trajectory line protruding toward the center of the lamination body 1.

[0062] For example, a convex trajectory line can be U-shaped or V-shaped.

[0063] In some embodiments, the first set of magnetic slots 21 may include a plurality of magnetic slots arranged along a convex trajectory line. The plurality of magnetic slots may be the same or different in size and shape, and this disclosure does not limit this.

[0064] In some embodiments, the shape and size of the magnet 200 may vary depending on the design and requirements of the motor. The shape of the magnet 200 may be rectangular, tile-shaped, fan-shaped, or bread-shaped, etc. Correspondingly, the shape of the magnet slot is adapted to the shape of the magnet 200.

[0065] For example, the value of S2 / S1 can be 0.13, 0.14, 0.142, 0.15, 0.155, 0.16, 0.17, 0.181, 0.19, or 0.2, etc.

[0066] When the area of ​​the first set of magnet slots 21 increases, the area of ​​magnets 200 that can be accommodated in the first set of magnet slots 21 increases. A larger area of ​​magnets 200 means that more magnetic material can be arranged on the rotor, thereby providing a stronger magnetic field. Increasing the area of ​​magnets 200 can also increase the magnetic flux. Therefore, the strong magnetic field generated by a larger magnet area helps to improve the electromagnetic conversion efficiency of the motor and allows more magnetic flux to pass through, all of which contribute to increasing the power and maximum torque of the motor.

[0067] With a fixed area of ​​rotor lamination 100 and a fixed area of ​​the first region 3 of rotor lamination 100 used to arrange the first set of magnet slots 21, increasing the area of ​​the first set of magnet slots 21 will correspondingly reduce the area that the first reinforcing part 23 can occupy within the first region 3. However, when the motor needs to reach high speeds, the magnets 200 will exert stress on the rotor lamination 100 during motor operation. If the area of ​​the first reinforcing part 23 is not considered when increasing the area of ​​the first set of magnet slots 21, the rotor lamination 100 may be unable to meet the stress requirements, resulting in deformation or damage. Furthermore, increasing the area of ​​the magnets 200 means increasing the mass of the magnets 200; at the same speed, a larger magnet 200 will exert greater stress on the rotor lamination 100.

[0068] Therefore, when designing the topology of the rotor lamination 100, it is necessary to increase the area of ​​the first set of magnet slots 21 to accommodate a larger magnet 200, and at the same time, it is necessary to set a first reinforcing part 23 of a corresponding size in the first region 3 so that the rotor lamination 100 has good mechanical strength.

[0069] If the ratio of the area of ​​the first reinforcing part 23 to the area of ​​the first set of magnetic steel grooves 21 in the first region 3 is less than 0.13, the area of ​​the first reinforcing part 23 is small under the premise of meeting the power and high speed requirements of the motor, which may lead to low mechanical strength of the first reinforcing part 23, and deformation or damage of the first reinforcing part 23 due to stress. If the ratio of the area of ​​the first reinforcing part 23 to the area of ​​the first set of magnetic steel grooves 21 in the first region 3 is greater than 0.2, the area of ​​the first reinforcing part 23 is large under the premise of meeting the power and high speed requirements of the motor, which may lead to magnetic leakage and adversely affect the power of the motor.

[0070] According to some embodiments of the present disclosure, the rotor lamination 100 is designed such that the area S1 of the first set of magnet slots 21 and the area S2 of the first reinforcing part 23 in the first region 3 satisfy: 0.13≤S2 / S1≤0.2. In this way, when the rotor lamination 100 is topologically designed, if it is necessary to increase the amount of magnets 200 to increase the power of the motor, the area of ​​the first reinforcing part 23 will also change accordingly as the area of ​​the magnets 200 increases. This can improve the mechanical strength of the rotor lamination 100, so as to avoid the rotor lamination 100 being unable to bear the stress generated by the motor under high speed after the power is increased. Thus, the rotor lamination 100 can meet the performance requirements of the motor to achieve both high power and high speed at the same time.

[0071] In some embodiments, S1 and S2 satisfy: 0.15 ≤ S2 / S1 ≤ 0.18. For example, the value of S2 / S1 can be 0.15, 0.155, 0.16, 0.17, or 0.18, etc. If the ratio of the area of ​​the first reinforcing part 23 to the area of ​​the first set of magnetic grooves 21 in the first region 3 is less than 0.15, the area of ​​the first reinforcing part 23 is small under the premise of meeting the power and high speed requirements of the motor, which may lead to local deformation or damage of the first reinforcing part 23 due to stress. If the ratio of the area of ​​the first reinforcing part 23 to the area of ​​the first set of magnetic grooves 21 in the first region 3 is greater than 0.18, the area of ​​the first reinforcing part 23 is large under the premise of meeting the power and high speed requirements of the motor, which may lead to magnetic leakage and adversely affect the power of the motor.

[0072] By keeping the ratio of the area of ​​the first reinforcing part 23 to the area of ​​the first set of magnet slots 21 within this range, when it is necessary to increase the power of the motor by increasing the amount of magnets 200, the area of ​​the first reinforcing part 23 will also change accordingly as the area of ​​the magnets 200 increases. This can improve the mechanical strength of the rotor lamination 100, so as to avoid the rotor lamination 100 being unable to bear the stress generated by the motor under high speed after the power is increased. This allows the rotor lamination 100 to meet the performance requirements of the motor to achieve both high power and high speed at the same time.

[0073] Referring to Figures 1 and 2, in some embodiments, the lamination body 1 also has stress buffer grooves 5, which surround the magnet slots. The stress buffer grooves 5 refer to non-magnetic regions or holes intentionally designed within the rotor core. For example, the stress buffer grooves 5 can be holes penetrating the rotor lamination 100, with the magnet slots and stress buffer grooves 5 connected. The stress buffer grooves 5 alter the magnetic flux path, thereby affecting the magnetic field distribution inside the motor. By changing the magnetic circuit, the stress buffer grooves 5 can reduce unnecessary magnetic leakage. By properly arranging these barriers, more magnetic flux can pass through the air gap into the stator along a predetermined path, rather than leaking into other undesirable directions. This helps to increase the effective magnetic flux of the motor, thereby improving motor efficiency and output torque.

[0074] Referring to Figures 1 and 2, in some embodiments, the stress buffer groove 5 may occupy a portion of the area of ​​the first region 3. Of course, a portion of the stress buffer groove 5 may also extend beyond the first region 3, and this disclosure does not impose any limitations on this.

[0075] In some embodiments, the contour of the stress buffer groove 5 is connected to the first contour 214 and the second contour 215.

[0076] In some embodiments, the area of ​​the first region 3 is S0, and S0, S1, and S2 satisfy: 0.70 ≤ (S1 + S2) / S0 ≤ 0.85. For example, the value of (S1 + S2) / S0 can be 0.7, 0.72, 0.727, 0.75, 0.8, 0.806, 0.83, or 0.85, etc.

[0077] When the ratio of the area of ​​the first set of magnet slots 21 to the area of ​​the first reinforcing part 23 in the first region 3 is constant, by increasing the proportion of the sum of the area of ​​the first set of magnet slots 21 and the area of ​​the first reinforcing part 23 in the first region 3 in the first region 3, the area of ​​the first set of magnet slots 21 can be increased as much as possible while meeting the stress requirements of the rotor lamination 100, thereby accommodating the largest possible magnet 200.

[0078] If the value of (S1+S2) / S0 is less than 0.7, the area of ​​the first set of magnet slots 21 on the rotor lamination 100 is relatively small, and the amount of magnets 200 used is less, which will reduce the power of the motor. If the value of (S1+S2) / S0 is greater than 0.85, the area of ​​the first set of magnet slots 21 and the outer contour of the rotor lamination 100 is relatively small, resulting in a smaller magnetic shielding area and stress-bearing area of ​​the rotor lamination 100. A value of (S1+S2) / S0 within the range of greater than or equal to 0.7 and less than or equal to 0.85 allows for the use of magnets 200 to be as large as possible, thereby resulting in higher motor power.

[0079] For example, when the number of magnet mounting parts 2 is six, and each magnet mounting part 2 includes a first set of magnet slots 21, the area of ​​the first set of magnet slots 21 can account for approximately 30% of the rotor area. Under this condition, the power density of the motor can reach 16.5 W / m². 2 .

[0080] In some embodiments, S0, S1, and S2 satisfy: 0.72 ≤ (S1 + S2) / S0 ≤ 0.81. For example, the value of (S1 + S2) / S0 can be 0.72, 0.727, 0.75, 0.78, 0.8, 0.806, or 0.81, etc.

[0081] If the value of (S1+S2) / S0 is less than 0.72, the area of ​​the first set of magnet slots 21 on the rotor lamination 100 is relatively small, resulting in fewer magnets 200 and reduced motor power. If the value of (S1+S2) / S0 is greater than 0.81, the areas of the first set of magnet slots 21 and the outer contour of the rotor lamination 100 are relatively small, resulting in smaller magnetic shielding area and stress-bearing area of ​​the rotor lamination 100. A value of (S1+S2) / S0 within the range of 0.72 to 0.81 allows for a larger quantity of magnets 200, thus increasing motor power.

[0082] Referring to Figure 4, it can be seen that as the area of ​​magnet 200 increases, the power increase of the motor is linear within a certain range. For every 0.1% change (e.g., increase) in the area of ​​magnet 200, the maximum power can be increased by approximately 2kW. Increasing the amount of magnet 200 has a significant effect on power improvement. When the area of ​​magnet 200 increases from 171mm²... 2 Increased to 191mm 2 The maximum power of the motor has been increased from 486kW to 502kW.

[0083] On the other hand, as shown in Figure 5, the maximum torque of the motor also increases within a certain range as the area of ​​the magnet 200 increases. A larger magnet 200 area results in a higher magnetic field strength and greater magnetic flux. A stronger magnetic field can generate a greater electromagnetic force under the same current conditions, thus increasing the torque on the rotor. Higher magnetic flux density generally means that the motor can generate greater torque within a smaller size. When the magnet 200 area increases from 171 mm²... 2 Increased to 191mm 2 The maximum torque of the motor has been increased from 416 N·m to 430 N·m.

[0084] Referring to Figure 6, with a fixed value for S2 / S1, as the value of (S1+S2) / S0 increases, the area S1 of the first set of magnet slots 21 will increase accordingly, and the power of the motor will increase linearly. When the value of (S1+S2) / S0 increases from 0.62 to 0.81, the maximum power of the motor increases from 471kW to 495kW.

[0085] Referring to Figure 7, when the value of S2 / S1 is constant, as the value of (S1+S2) / S0 increases, the area S1 of the first set of magnet slots 21 increases, and the area S2 of the first reinforcing part 23 in the first region 3 also increases accordingly, so that the rotor lamination 100 can meet the stress requirements of high motor speed while meeting the requirements of high power.

[0086] Referring to Figures 1 and 2, in some embodiments, the length of the first reinforcing part 23 is L1, and the width of the first set of magnet grooves 21 is W1, where L1 and W1 satisfy: 1.5 ≤ W1 / L1 ≤ 2.2. It should be noted that the length of the first reinforcing part 23 is the circumferential extension dimension of the first reinforcing part along the lamination body 1. Furthermore, the shape of the first reinforcing part 23 is irregular, and the length L1 of the first reinforcing part 23 is the minimum circumferential extension dimension of the first reinforcing part 23 within the first region 3. When the minimum dimension of the first reinforcing part 23 can meet the stress requirements at a certain rotational speed, correspondingly, the remaining parts of the first reinforcing part 23 can also meet the corresponding stress requirements.

[0087] For example, the value of W1 / L1 can be 1.5, 1.55, 1.6, 1.7, 1.8, 1.85, 1.9, 2.0, 2.1, or 2.2, etc. If the value of W1 / L1 is less than 1.5, with a fixed width of the first set of magnet slots 21, the length of the first reinforcing part 23 will be relatively large, which may lead to increased magnetic leakage and is not conducive to increasing the power of the motor. If the value of W1 / L1 is greater than 2.2, with a fixed width of the first set of magnet slots 21, the length of the first reinforcing part 23 will be relatively small, which may lead to lower mechanical strength of the first reinforcing part 23. During the operation of the motor, the first reinforcing part 23 may deform or be damaged due to local stress. When the value of W1 / L1 is within the range of less than or equal to 1.5 and greater than or equal to 2.2, under the condition that the width of the first set of magnet slots 21 is fixed and can meet the power requirements of the motor, the leakage magnetic phenomenon can be reduced, avoiding adverse effects on power output. It can also ensure that the first reinforcing part 23 is sufficient to bear the stress of the magnet 200, and avoid local deformation or damage to the rotor lamination 100.

[0088] Referring to Figures 1 and 2, in some embodiments, the length L1 of the first reinforcing part 23 satisfies: 3.7mm ≤ L1 ≤ 4.8mm. For example, the value of L1 can be 3.7, 3.8, 4, 4.2, 4.25, 4.3, 4.4, 4.5, 4.55, 4.6, 4.65, 4.7, or 4.8, etc. If the length of the first reinforcing part 23 is less than 3.7mm, and the area and quantity of the magnets 200 in the first set of magnets 200 meet the power requirements of the motor, the mechanical strength of the first reinforcing part 23 may be insufficient to withstand the stress of the magnets 200, leading to deformation or damage to the rotor laminations 100. If the length of the first reinforcing part 23 is greater than 4.8mm, it may increase magnetic leakage, thereby adversely affecting the power of the motor. When the length of the first reinforcing part 23 is within the range of less than or equal to 3.7 mm and greater than or equal to 4.8 mm, leakage flux can be minimized to meet the power requirements of the motor, and the stress of the magnet 200 due to insufficient mechanical strength cannot be borne at higher speeds can be avoided.

[0089] Referring to Figures 1 and 2, in some embodiments, the length L1 of the first reinforcing part 23 satisfies: 4.4mm ≤ L1 ≤ 4.6mm. For example, the value of L1 can be 4.4, 4.45, 4.48, 4.5, 4.52, 4.55, 4.58, or 4.6, etc. If the length of the first reinforcing part 23 is less than 4.4mm, and the area and quantity of the magnets 200 in the first set of magnets 200 meet the power requirements of the motor, the mechanical strength of the first reinforcing part 23 may be insufficient to withstand the stress of the magnets 200, leading to deformation or damage to the rotor laminations 100. If the length of the first reinforcing part 23 is greater than 4.6mm, it may increase magnetic leakage, thereby adversely affecting the power of the motor. When the length of the first reinforcing part 23 is within the range of less than or equal to 4.4 mm and greater than or equal to 4.6 mm, leakage flux can be minimized to meet the power requirements of the motor, and the stress of the magnet 200 due to insufficient mechanical strength cannot be borne at higher speeds can be avoided.

[0090] Referring to Figures 1 and 2, in some embodiments, the width W1 of the first set of magnet slots 21 satisfies: 7.2mm ≤ W1 ≤ 8.2mm. For example, the value of W1 can be 7.2, 7.3, 7.4, 7.5, 7.55, 7.6, 7.7, 7.8, 7.9, 8, 8.1, or 8.2, etc. If the width of the first set of magnet slots 21 is less than 7.2mm, the area of ​​magnets 200 that can be accommodated within the first set of magnet slots 21 and the amount of magnets 200 used are relatively small, making it impossible for the motor to achieve high power performance requirements. If the width of the first set of magnet slots 21 is greater than 8.2mm, it will result in a larger pole arc angle β of the rotor laminations 100, causing uneven magnetic field distribution in the rotor laminations 100 and generating additional harmonic components. These harmonics will cause fluctuations in the motor output torque, thereby causing vibration and noise. The motor output torque will exhibit periodic fluctuations. This torque fluctuation not only affects the driving experience but also transmits it to the chassis through the transmission system, causing structural vibration and further amplifying noise and vibration problems, adversely impacting the noise, vibration, and harshness (NVH) performance of the vehicle 1000. The width of the first set of magnet slots 21 is within the range of less than or equal to 7.2 mm and greater than or equal to 8.2 mm, ensuring that the amount of magnets 200 used meets the power requirements of the motor without causing the pole arc angle β of the rotor laminations 100 to be excessively large.

[0091] Referring to Figure 1, the pole arc angle refers to the projection angle of the magnet 200 on the circumference of the rotor, that is, the angle measured from one end of the magnet 200 to the other along the circumference of the rotor lamination 100, that is, the angle measured from one end of the first set of magnet slots 21 to the other along the circumference of the rotor lamination 100.

[0092] Furthermore, when the width of the magnet 200 exceeds 8.2 mm, the processing technology for the magnet 200 becomes more difficult. Therefore, in order to accommodate the magnet 200, the width of the first set of magnet grooves 21 should not exceed 8.2 mm.

[0093] Referring to Figures 8-11, when the length of the first set of magnet slots 21 is constant, the greater the width of the first set of magnet slots 21, the greater the ultimate stress value generated by the magnets 200 housed within the first set of magnet slots 21 during motor operation. When the width W1 of the first set of magnet slots 21 is 7.2 mm, the ultimate stress value is approximately 736 MPa; when the width W1 of the first set of magnet slots 21 increases to 7.8 mm, the ultimate stress value is approximately 742 MPa; when the width W1 of the first set of magnet slots 21 increases to 8.0 mm, the ultimate stress value is approximately 761 MPa; and when the width W1 of the first set of magnet slots 21 increases to 8.2 mm, the ultimate stress value is approximately 787 MPa.

[0094] As the width of the first set of magnet slots 21 increases from 7.2 mm to 8.2 mm, the pole arc coefficient of the rotor lamination 100 gradually increases. The pole arc coefficient is the ratio of the pole arc angle β to the pole angle. The wider the first set of magnet slots 21, the larger the pole arc angle β. Since the pole angle is a constant, the pole arc coefficient of the rotor lamination 100 is also larger. The pole angle is determined by the number of magnetic poles on the rotor lamination 100, which is also the number of magnet mounting portions 2. For example, if there are six magnet mounting portions 2, the corresponding pole angle is 60°. As the width of the first set of magnet slots 21 increases from 7.2 mm to 8.2 mm, the pole arc coefficient of the rotor lamination 100 increases from 0.83 to 0.85.

[0095] Referring to Figures 1 and 2, in some embodiments, the width W1 of the first set of magnet slots 21 satisfies: 7.2mm ≤ W1 ≤ 7.8mm. For example, the value of W1 can be 7.2, 7.3, 7.4, 7.5, 7.55, 7.6, 7.7, 7.8, etc. If the width of the first set of magnet slots 21 is less than 7.2mm, the area of ​​magnets 200 that can be accommodated within the first set of magnet slots 21 and the amount of magnets 200 used are relatively small, making it impossible for the motor to achieve high power performance requirements. If the width of the first set of magnet slots 21 is greater than 7.8mm, the width of the magnets 200 correspondingly set within the first set of magnet slots 21 will be greater than 7.8mm, making the processing technology of the magnets 200 more difficult. The width of the first set of magnet slots 21 is within the range of less than or equal to 7.2 mm and greater than or equal to 8.2 mm, which ensures that the amount of magnets 200 used can meet the power requirements of the motor, and will not cause the pole arc angle β of the rotor lamination 100 to be too large. It also allows the first set of magnet slots 21 to be well matched with the process requirements of magnets 200.

[0096] Referring to Figures 1-2, in some optional embodiments, the magnet mounting portion 2 includes a first portion, a second portion, and a third portion arranged sequentially along the circumference of the lamination body 1.

[0097] In some embodiments, when the plurality of magnetic slots of the first group of magnetic slots 21 are arranged along a convex trajectory line, the first part, the second part, and the third part are arranged along the extension direction of the convex trajectory line, and the second part is located between the end of the first part near the center of the lamination body 1 and the end of the third part near the center of the lamination body 1. The arrangement of the first group of magnetic slots 21 is approximately "U-shaped".

[0098] The first set of magnetic steel grooves 21 includes a first magnetic steel groove 211, a second magnetic steel groove 212 and a third magnetic steel groove 213. The first magnetic steel groove 211 is located in the first part, the second magnetic steel groove 212 is located in the second part, and the third magnetic steel groove 213 is located in the third part.

[0099] The multiple magnet slots of the first set of magnet slots 21 are arranged in the first part, the second part and the third part respectively. Under the condition of constant motor speed, this arrangement is conducive to reducing the ultimate stress value generated by the magnets 200 in the first set of magnet slots 21.

[0100] Referring to Figure 2, the area of ​​the first magnetic steel groove 211 is Z1, the area of ​​the second magnetic steel groove 212 is Z2, and the area of ​​the third magnetic steel groove 213 is Z3. The sum of the areas of the first magnetic steel groove 211, the second magnetic steel groove 212, and the third magnetic steel groove 213 is the area S1 of the first group of magnetic steel grooves.

[0101] Referring to Figures 12 and 13, comparative analysis shows that, when the areas of the magnet 200 and the reinforcing portion are the same, the ultimate stress generated by the magnet 200 within the "V-shaped" distribution of the magnet grooves in related technologies is higher than the ultimate stress generated by the magnet 200 within the "U-shaped" distribution of the magnet grooves in some embodiments of this disclosure. When the magnet grooves are "V-shaped," the ultimate stress generated by the magnet 200 within the magnet grooves is approximately 806 MPa; when the magnet grooves are "U-shaped," the ultimate stress generated by the magnet 200 within the magnet grooves is approximately 769 MPa.

[0102] In some embodiments, the first reinforcing portion 23 is axially symmetrical about the centerline of the second portion, so that the stress borne by each part of the first reinforcing portion 23 is more uniform.

[0103] Referring to Figures 1 and 2, in some embodiments, there are at least two second magnet grooves 212. For example, there may be two or more second magnet grooves 212. By having at least two second magnet grooves 212, a first reinforcing portion 23 is formed between any two second magnet grooves 212, making the distribution of the first reinforcing portions 23 more uniform. This is beneficial to improving the stress-bearing effect of the first reinforcing portions 23 and increasing the allowable stress strength of the first reinforcing portions 23.

[0104] Referring to Figures 1 and 2, in some embodiments, the first reinforcing part 23 includes a first reinforcing rib 231 and a third reinforcing rib 233. The first reinforcing rib 231 is located between the first magnet groove 211 and the second magnet groove 212, and the third reinforcing rib 233 is located between the second magnet groove 212 and the third magnet groove 213. Based on the distribution of the magnet grooves in the first group of magnet grooves 21, the distribution of the reinforcing ribs in the first reinforcing part 23 is adjusted so that each reinforcing rib better shares the stress generated by the magnet 200.

[0105] Referring to Figures 1-2, in some embodiments, the first reinforcing part 23 further includes a second reinforcing rib 232, which is located between two adjacent second magnet slots 212. Based on the distribution of each magnet slot in the first group of magnet slots 21, the distribution of each reinforcing rib of the first reinforcing part 23 (e.g., the first reinforcing rib 231, the second reinforcing rib 232, and the third reinforcing rib 233) is adjusted so that each reinforcing rib better shares the stress generated by the magnet 200.

[0106] Referring to Figure 2, the area of ​​the first reinforcing rib 231 is Y1, the area of ​​the second reinforcing rib 232 is Y2, and the area of ​​the third reinforcing rib 233 is Y3. The sum of the areas of the first reinforcing rib 231, the second reinforcing rib 232, and the third reinforcing rib 233 is the area S2 of the first reinforcing part.

[0107] Referring to Figure 2, the width of the first reinforcing rib 231 is L3, the width of the second reinforcing rib 232 is L4, and the width of the third reinforcing rib 233 is L5. The sum of the widths of the first reinforcing rib 231, the second reinforcing rib 232, and the third reinforcing rib 233 is the length L1 of the first reinforcing part.

[0108] For example, if there are two second magnet grooves 212, then there is one second reinforcing rib 232; or, if there are three second magnet grooves 212, then there are two second reinforcing ribs 232.

[0109] In some embodiments, the first reinforcing rib 231 and the third reinforcing rib 233 are axially symmetrical about the centerline of the second reinforcing rib 232.

[0110] In some embodiments, along the extension direction of the convex trajectory line of the first set of magnet grooves 21, the dimensions of the first reinforcing rib 231 and the third reinforcing rib 233 are the same, and the dimensions of the second reinforcing rib 232 are smaller than the dimensions of the first reinforcing rib 231.

[0111] When the area of ​​the first set of magnet slots 21 is fixed, for example, the width of the first set of magnet slots 21 is about 7.2 mm, the length of the first set of magnet slots 21 is about 25 mm, and the maximum speed of the motor reaches 30,000 rpm, in order to meet the ratio between the area of ​​the first set of magnet slots 21 and the area of ​​the first reinforcing part 23 in the first region 3, and to meet the stress bearing capacity requirements of the magnet 200 on the first reinforcing part 23, the dimensions of the first reinforcing rib 231, the second reinforcing rib 232, and the third reinforcing rib 233 along the extension direction of the convex trajectory line of the first set of magnet slots 21 must be greater than or equal to 1.2 mm and less than or equal to 1.8 mm. For example, the dimension of the first reinforcing rib 231 along the extension direction of the convex trajectory line of the first set of magnet grooves 21 can be 1.6, 1.62mm, 1.67mm, 1.7mm or 1.8mm, etc.; the dimension of the second reinforcing rib 232 along the extension direction of the convex trajectory line of the first set of magnet grooves 21 can be 1.2mm, 1.21mm, 1.25mm, 1.3mm, 1.5mm, etc.

[0112] In some embodiments, the first magnet slot 211 and the third magnet slot 213 have an included angle θ1, where θ1 satisfies: 110° ≤ θ1 ≤ 120°. Exemplarily, the value of θ1 can be 110°, 111°, 112°, 115°, 116°, 118°, or 120°, etc. Changes in the included angle θ1 between the first magnet slot 211 and the third magnet slot 213 cause a corresponding change in the pole arc angle β of the rotor lamination 100. An included angle θ1 between the first magnet slot 211 and the third magnet slot 213 within the range of greater than or equal to 110° and less than or equal to 120° results in a more suitable pole arc angle for the rotor lamination 100, thereby ensuring good NVH performance and output performance of the motor.

[0113] In some embodiments, the lamination body 1 is provided with a shaft hole 7. In the radial direction of the lamination body 1, the distance between the second contour 215 and the edge of the shaft hole 7 is M1, and the distance between the outer contour 11 of the lamination body and the edge of the shaft hole 7 is M2. M1 and M2 satisfy: 0.4 ≤ M1 / M2 ≤ 0.61. For example, the value of M1 / M2 can be 0.4, 0.42, 0.45, 0.5, 0.55, 0.6, 0.61, etc. If the value of M1 / M2 is less than 0.4, stress concentration occurs at the first reinforcing part 23 during motor operation, requiring higher mechanical strength from the first reinforcing part 23. If the value of M1 / M2 is greater than 0.61, the increased mass of the rotor lamination 100 leads to increased stress on the rotor lamination 100. When M1 / M2 is within the range of greater than or equal to 0.4 and less than or equal to 0.61, the stress borne by the first reinforcing part 23 is more suitable.

[0114] Referring to Figure 14, as M1 / M2 increases, the stress at the first reinforcing part 23 first decreases and then increases.

[0115] In some embodiments, the lamination body 1 further includes a rotor yoke, and the magnet mounting portion 2 is located on the side of the rotor yoke away from the center of the lamination body 1; the outline shape of the edge of the rotor yoke is the same as the outer outline 11 of the lamination body, and the rotor yoke is located between the second outline 215 and the edge of the shaft hole 7 along the radial direction of the lamination body 1.

[0116] Referring to Figures 1-3, in some embodiments, the magnet mounting portion 2 further includes a second set of magnet slots 22. The second set of magnet slots 22 is located radially outside the first set of magnet slots 21, and the first set of magnet slots 21 and the second set of magnet slots 22 are arranged radially at intervals along the rotor lamination 100. By providing the second set of magnet slots 22, the rotor lamination 100 can further increase the area of ​​the magnets 200 accommodated, thereby improving the power of the motor.

[0117] In some embodiments, the magnet mounting part 2 may further include a first set of magnet slots 21, a second set of magnet slots 22, and other magnet slots arranged radially along the rotor lamination 100. For example, the magnet mounting part 2 may include three sets of magnet slots or four sets of magnet slots, etc.

[0118] Referring to Figures 1-3, in some embodiments, the second set of magnet slots 22 includes a plurality of magnet slots, and the lamination body 1 between two adjacent magnet slots is formed as a second reinforcing part 24. That is, the portion of the lamination body 1 located between two adjacent magnet slots of the second set of magnet slots 22 is formed as a second reinforcing part 24.

[0119] In some embodiments, the plurality of magnet slots of the second magnet slot 22 are arranged along a convex trajectory line protruding toward the center of the lamination body 1. For example, the extending direction of the convex trajectory line of the second set of magnet slots 22 and the extending direction of the convex trajectory line of the first set of magnet slots 21 may be the same or different, and this disclosure does not limit this.

[0120] The outline of the second set of magnet grooves 22 away from the center of the lamination body 1 is the third outline 223, and the outline facing the center of the lamination body 1 is the fourth outline 224. The area enclosed by the third outline 223, the fourth outline 224, and the outer outline 11 of the lamination body is the second region 4. The area of ​​the second set of magnet grooves 22 is S4, and the area of ​​the second reinforcing part 24 in the second region 4 is S5. S4 and S5 satisfy: 0.13≤S5 / S4≤0.2. For example, the value of S5 / S4 can be 0.13, 0.14, 0.142, 0.15, 0.155, 0.16, 0.17, 0.181, 0.19, or 0.2, etc.

[0121] It should be noted that the second region 4 is the area enclosed by the intersection of the straight line containing the third contour 223 and the straight line containing the fourth contour 224, and the outer contour 11 of the sheet body.

[0122] With a fixed area of ​​rotor lamination 100 and a fixed area of ​​the second region 4 of rotor lamination 100 used to arrange the second set of magnet slots 22, increasing the area of ​​the second set of magnet slots 22 will correspondingly reduce the area that the second reinforcing part 24 can occupy within the second region 4. However, when the motor needs to reach high speeds, the magnets 200 will exert stress on the rotor lamination 100 during motor operation. If the area of ​​the second reinforcing part 24 is not considered when increasing the area of ​​the second set of magnet slots 22, the rotor lamination 100 may be unable to meet the stress requirements, resulting in deformation or damage. Moreover, increasing the area of ​​the magnets 200 means increasing the mass of the magnets 200. At the same speed, a larger magnet 200 will exert greater stress on the second reinforcing part 24 of the rotor lamination 100.

[0123] Therefore, when designing the topology of the rotor lamination 100, it is necessary to increase the area of ​​the second set of magnet slots 22 to accommodate a larger magnet 200, and at the same time, it is necessary to set a second reinforcing part 24 of a corresponding size in the second region 4 so that the rotor lamination 100 has good mechanical strength.

[0124] If the ratio of the area of ​​the second reinforcing part 24 and the area of ​​the second set of magnetic steel grooves 22 in the second region 4 is less than 0.13, the area of ​​the second reinforcing part 24 is too small under the premise of meeting the power and high speed requirements of the motor, which may lead to low mechanical strength of the second reinforcing part 24, and deformation or damage of the second reinforcing part 24 due to stress. If the ratio of the area of ​​the second reinforcing part 24 and the area of ​​the second set of magnetic steel grooves 22 in the second region 4 is greater than 0.2, the area of ​​the second reinforcing part 24 is too large under the premise of meeting the power and high speed requirements of the motor, which may lead to magnetic leakage and have an adverse effect on the power of the motor.

[0125] In some embodiments, S4 and S5 satisfy: 0.15 ≤ S5 / S4 ≤ 0.18. For example, the value of S5 / S4 can be 0.15, 0.155, 0.16, 0.17, or 0.18, etc.

[0126] In some embodiments, the area of ​​the second region 4 is smaller than the area of ​​the first region 3, the area of ​​the second set of magnetic grooves 22 is also smaller than the area of ​​the first set of magnetic grooves 21, and the stress required to be borne by the second reinforcing part 24 is also smaller than the stress required to be borne by the first reinforcing part 23.

[0127] In some embodiments, the width of the second set of magnet grooves 22 is W2, and the dimension of the second reinforcing part 24 along the extending direction of the convex trajectory line of the second set of magnet grooves 22 is L2. The value of W2 / L2 is greater than or equal to 5.2 and less than or equal to 7.4. For example, the value of W2 / L2 can be 5.2, 5.5, 6, 6.2, 6.5, 7, 7.4, etc.

[0128] Referring to Figures 1-3, in some embodiments, the second region 4 includes a fourth part, a fifth part, and a sixth part arranged sequentially along the extension direction of the convex trajectory line, wherein the fifth part is located between the end of the fourth part near the center of the lamination body 1 and the end of the sixth part near the center of the lamination body 1.

[0129] The second set of magnetic steel channels 22 includes a fourth magnetic steel channel 225, a fifth magnetic steel channel 221 and a sixth magnetic steel channel 222. The fourth magnetic steel channel 225 is located in the fourth part, the fifth magnetic steel channel 221 is located in the fifth part, and the sixth magnetic steel channel 222 is located in the sixth part.

[0130] Referring to Figure 2, the area of ​​the fourth magnet groove 225 is Z4, the area of ​​the fifth magnet groove 221 is Z5, and the area of ​​the sixth magnet groove 222 is Z6. The sum of the areas of the fourth magnet groove 225, the fifth magnet groove 221, and the sixth magnet groove 222 is the area S4 of the second group of magnet grooves.

[0131] The fourth magnet slot 225 and the sixth magnet slot 222 have an included angle θ2, where θ2 satisfies: 75°≤θ2≤90°. For example, the value of θ2 can be 75°, 78°, 80°, 85°, 90°, etc.

[0132] The second reinforcing part includes a fourth reinforcing rib and a fifth reinforcing rib. The fourth reinforcing rib is located between the fourth magnet groove 225 and the fifth magnet groove 221, and the fifth reinforcing rib is located between the fifth magnet groove 221 and the sixth magnet groove 222.

[0133] Referring to Figure 2, the area of ​​the fourth reinforcing rib is Y4, the area of ​​the fifth reinforcing rib is Y5, and the sum of the areas of the fourth and fifth reinforcing ribs is the area S5 of the second reinforcing part.

[0134] In some embodiments, the area of ​​the second region 4 is S3, and S3, S4, and S5 satisfy: (S4+S5) / S3≤(S1+S2) / S0. Thus, the area and quantity of magnets 200 in the second region 4 are smaller than those in the first region 3, optimizing the magnetic field distribution across the entire rotor lamination 100 surface and making it more uniform. During motor operation, magnets 200 are more susceptible to greater mechanical stress at locations far from the center of the rotor lamination 100. Therefore, reducing the area of ​​magnets 200 at these locations helps reduce stress concentration caused by centrifugal force. To ensure the stability and safety of the rotor lamination 100 structure, larger magnets 200 are typically placed closer to the center because the centrifugal force is relatively smaller there, allowing them to withstand greater mass without deformation or damage.

[0135] Some embodiments of this disclosure also provide a motor rotor, which includes a magnet 200 and the rotor lamination 100 described above, with the magnet 200 disposed in a magnet slot.

[0136] Since the motor rotors provided in some embodiments of this disclosure include the rotor laminations 100 described above, both can solve the same technical problems and achieve the same effects.

[0137] Magnet 200 provides the stable magnetic field required for motor operation. For example, magnet 200 can be made of rare earth element alloys, such as neodymium iron boron (NdFeB) and samarium cobalt (SmCo), which have very high magnetic energy products and can provide strong magnetic field strength.

[0138] In some embodiments, the magnet 200 may be embedded in the magnet slot of the rotor lamination 100, or the magnet 200 may be attached to the surface of the magnet slot.

[0139] Some embodiments of this disclosure also provide an electric motor, which includes the rotor lamination 100 described above or the motor rotor described above.

[0140] In some embodiments, the motor further includes motor electronics, and the motor stator is sleeved outside the rotor lamination 100.

[0141] Since the motors provided in some embodiments of this disclosure include the rotor laminations 100 or motor rotors of any of the above-described technical solutions, both can solve the same technical problems and achieve the same effects.

[0142] Some embodiments of this disclosure also provide a drive assembly, including the motor rotor described above or the motor described above.

[0143] Since the drive assemblies provided in some embodiments of this disclosure include the motors described above, both can solve the same technical problems and achieve the same effects.

[0144] Referring to Figure 15, some embodiments of this disclosure also provide a vehicle 1000, which includes the motor or drive assembly described above.

[0145] Since the vehicle 1000 provided in some embodiments of this disclosure includes the drive assembly described above, both can solve the same technical problem and achieve the same effect.

[0146] In the description of some embodiments of this disclosure, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0147] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A rotor lamination (100), comprising: The lamination body (1) is provided with a plurality of magnet mounting parts (2), the plurality of magnet mounting parts (2) are arranged at intervals along the circumference of the lamination body (1), any one of the plurality of magnet mounting parts (2) includes a first group of magnet slots (21), the first group of magnet slots (21) includes a plurality of magnet slots, and the lamination body (1) between two adjacent magnet slots in the plurality of magnet slots is formed as a first reinforcing part (23); The first set of magnet grooves (21) has a first contour (214) that is away from the center of the lamination body (1), and the first set of magnet grooves (21) has a second contour (215) that is towards the center of the lamination body (1). The area enclosed by the first contour (214), the second contour (215) and the outer contour (11) of the lamination body is a first region (3). The area of ​​the first set of magnet grooves (21) is S1, and the area of ​​the first reinforcing part (23) in the first region (3) is S2. S1 and S2 satisfy: 0.13≤S2 / S1≤0.

2.

2. The rotor lamination (100) of claim 1, wherein S1 and S2 satisfy the condition: 0.15≤S2 / S1≤0.

18.

3. The rotor lamination (100) of claim 1 or 2, wherein The area of ​​the first region (3) is S0, and S0, S1 and S2 satisfy: 0.70≤(S1+S2) / S0≤0.

85.

4. The rotor lamination (100) of claim 3, wherein The S0, S1, and S2 satisfy the condition: 0.72≤(S1+S2) / S0≤0.

81.

5. The rotor lamination (100) according to any of claims 1 to 4, wherein The length of the first reinforcing part (23) is L1, and the width of the first set of magnetic steel grooves (21) is W1. The L1 and the W1 satisfy: 1.5≤W1 / L1≤2.

2.

6. The rotor lamination (100) of claim 5, wherein The length L1 of the first reinforcing part (23) and the width W1 of the first set of magnetic grooves (21) satisfy at least one of the following: The length L1 of the first reinforcing part (23) satisfies: 3.7mm ≤ L1 ≤ 4.8mm; and, The width W1 of the first set of magnetic steel grooves (21) satisfies: 7.2mm≤W1≤8.2mm.

7. The rotor lamination (100) of claim 6, wherein The length L1 of the first reinforcing part (23) and the width W1 of the first set of magnetic grooves (21) satisfy at least one of the following: The length L1 of the first reinforcing part (23) satisfies: 4.4mm ≤ L1 ≤ 4.6mm; and, The width W1 of the first set of magnetic steel grooves (21) satisfies: 7.2mm≤W1≤7.8mm.

8. The rotor lamination (100) according to any of claims 1 to 7, wherein The magnet mounting part (2) includes a first part (31), a second part (32) and a third part (33) arranged sequentially along the circumference of the lamination body (1); the first set of magnet slots (21) includes a first magnet slot (211), at least one second magnet slot (212) and a third magnet slot (213), the first magnet slot (211) is located in the first part (31), the at least one second magnet slot (212) is located in the second part (32), and the third magnet slot (213) is located in the third part (33).

9. The rotor lamination (100) of claim 8, wherein, The first reinforcing part (23) includes a first reinforcing rib (231) and a third reinforcing rib (233). The first reinforcing rib (231) is located between the first magnet groove (211) and the at least one second magnet groove (212), and the third reinforcing rib (233) is located between the at least one second magnet groove (212) and the third magnet groove (213).

10. The rotor lamination (100) of claim 8 or 9, wherein The at least one second magnet slot (212) includes at least two second magnet slots (212).

11. The rotor lamination (100) of claim 10, wherein The first reinforcing part (23) further includes a second reinforcing rib (232), which is located between two adjacent second magnet slots (212) in the at least two second magnet slots (212).

12. The rotor lamination (100) according to any of claims 8 to 11, wherein The first magnetic groove (211) and the third magnetic groove (213) have an included angle θ1, wherein θ1 satisfies: 110°≤θ1≤120°.

13. The rotor lamination (100) according to any of claims 1 to 12, wherein The lamination body (1) is provided with a shaft hole (7). In the radial direction of the lamination body (1), the distance between the second contour (215) and the edge of the shaft hole (7) is M1, and the distance between the outer contour (11) of the lamination body (1) and the edge of the shaft hole (7) is M2. M1 and M2 satisfy: 0.4≤M1 / M2≤0.

61.

14. The rotor lamination (100) according to any of claims 1 to 13, wherein The magnet mounting part (2) further includes a second set of magnet grooves (22), which are located radially outside the first set of magnet grooves (21).

15. The rotor lamination (100) of claim 14, wherein, The second set of magnetic steel grooves (22) includes a plurality of magnetic steel grooves, wherein the lamination body (1) between two adjacent magnetic steel grooves is formed as a second reinforcing part (24); The outline of the second set of magnet grooves (22) away from the center of the stamp body (1) is the third outline (223), and the outline of the second set of magnet grooves (22) facing the center of the stamp body (1) is the fourth outline (224). The area enclosed by the third outline (223), the fourth outline (224) and the outer outline (11) of the stamp body is the second area (4). The area of ​​the second set of magnetic steel grooves (22) is S4, and the area of ​​the second reinforcing part (24) in the second region (4) is S5. S4 and S5 satisfy: 0.13≤S4 / S5≤0.

2.

16. The rotor lamination (100) of claim 15, wherein, The area of ​​the second region (4) is S3, and S3, S4 and S5 satisfy: (S4+S5) / S3≤(S1+S2) / S0.

17. An electric machine rotor comprising: Magnet (200) and rotor lamination (100) according to any one of claims 1-16; The magnet (200) is disposed in the magnet groove.

18. An electric machine comprising: The rotor lamination (100) according to any one of claims 1 to 16; or the motor rotor according to claim 17.

19. A drive assembly comprising: The motor rotor according to claim 17; Alternatively, the motor according to claim 18.

20. A vehicle (1000) comprising the electric motor according to claim 18; or the drive assembly according to claim 19.

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