Rotor core, rotor assembly, electric machine and carrier

Abstract

This utility model relates to the field of electric motors, and discloses a rotor core, a rotor assembly, a motor, and a carrier. The rotor core includes: a disc; multiple slot groups arranged at intervals along the circumference of the disc on its end face, all used for mounting magnets; and multiple first grooves arranged at intervals along the circumference of the disc on its outer circumference. Along the radial direction of the disc, each first groove is opposite to a corresponding slot group. Each first groove includes two first sidewalls, both of which are planar and their ends away from the center of the disc are far from each other. The ends of the two first sidewalls near the center of the disc intersect, or are connected by a planar surface or a first arc surface, the first arc surface curving towards the center of the disc. The convergence of the two sidewalls of the first groove towards the center reduces the radial magnetic flux distribution when guiding magnetic lines of force around the first groove area, converting more magnetic flux into tangential components. This maintains or increases the power density of the motor without increasing the amount of magnets used.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to rotor core, rotor assembly, motor and carrier. Background Technology

[0002] In the field of new energy vehicles, the motor is a core component, and its overall performance directly affects the vehicle's power output and user experience. To improve driving comfort, noise, vibration, and harshness during motor operation have become key technical indicators, collectively known as NVH. Therefore, how to optimize NVH performance while ensuring motor performance has become a pressing technical challenge for the industry.

[0003] In related technologies, the "thickened magnet + increased air gap" solution is commonly used to optimize the NVH performance of motors. This solution increases the magnetic field strength by increasing the magnet thickness and expands the air gap space to reduce the air gap harmonic content, thereby reducing torque pulsation and electromagnetic force during motor operation, and thus improving NVH performance.

[0004] However, thickening the magnet increases the amount of permanent magnet material used, leading to a significant increase in motor production costs; increasing the air gap weakens the air gap magnetic field strength, reducing the motor's power density and efficiency. Utility Model Content

[0005] In view of this, the present invention provides a rotor core, rotor assembly, motor and carrier to solve or improve the problem that the use of thickened magnets and increased air gap to improve NVH performance in related technologies results in higher costs and lower power density.

[0006] In a first aspect, this utility model provides a rotor core, comprising:

[0007] Disk body;

[0008] Multiple slot groups are arranged at intervals along the circumference of the disk body on the end face of the disk body, and each is used to install magnets;

[0009] Multiple first grooves are arranged at intervals along the circumference of the disk body on the outer circumferential surface of the disk body. Along the radial direction of the disk body, each first groove is opposite to the corresponding slot group. Each first groove includes two first sidewalls, both of which are planar and their ends away from the center of the disk body are far apart from each other.

[0010] The two first sidewalls intersect at one end near the center of the disk body, or are connected by a plane or a first arc surface, the first arc surface being curved toward the center of the disk body.

[0011] In one optional embodiment, the slot group includes two first magnet slots arranged to form a V-shaped structure, and the ends of the two first magnet slots away from the center of the disk body are far apart from each other. Along the radial direction of the disk body, the outer peripheral portion of the disk body corresponding to each first magnet slot is provided with a corresponding first groove.

[0012] In an optional embodiment, the slot group further includes a through hole disposed within the V-shaped structure formed by the two first magnet slots;

[0013] And / or, the included angle between the two first magnet slots is 138° to 170°.

[0014] In one optional embodiment, the slot group further includes two second magnet slots arranged to form a V-shaped structure, with the ends of the two second magnet slots away from the center of the disk body being far apart from each other. The second magnet slots correspond one-to-one with the first magnet slots and are located on the side of the first magnet slots closer to the center of the disk body.

[0015] In an optional embodiment, the rotor core further includes a second groove on the outer peripheral surface of the disk body. Along the radial direction of the disk body, each second magnet slot has a corresponding second groove on the outer peripheral portion of the disk body. The second groove includes two second sidewalls, both of which are planar and their ends away from the center of the disk body are far apart from each other. The ends of the two second sidewalls near the center of the disk body intersect or are connected by a planar surface or a second arc surface. The second arc surface is curved toward the center of the disk body.

[0016] And / or, the slot group further includes cooling channel holes disposed between the two second magnet slots;

[0017] And / or, the rotor core further includes a weight reduction hole, which is disposed between two second magnet slots of two adjacent slot groups.

[0018] In one optional embodiment, the included angle between the two first sidewalls of the first groove is 130° to 155°.

[0019] And / or, the included angle between the two second sidewalls of the second groove is 130° to 155°.

[0020] In one alternative embodiment, the two first magnet slots are radially symmetrical, and the two second magnet slots are symmetrical about the line of symmetry of the two first magnet slots.

[0021] Wherein, the angle between the line connecting the center of the disk body and the center of the first arc surface and the line of symmetry is 4° to 7°, and / or, the angle between the line connecting the center of the disk body and the center of the second arc surface and the line of symmetry is 15° to 22.5°.

[0022] Secondly, this utility model also provides a rotor assembly, including a magnet and a rotor core as described above.

[0023] Thirdly, this utility model also provides an electric motor, including the rotor core as described above or the rotor assembly as described above.

[0024] Fourthly, this utility model also provides a carrier, including the rotor core, the rotor assembly, or the motor as described above.

[0025] The rotor core provided by this invention has a first groove arranged along the outer periphery of the disc, which expands the air gap at the corresponding position in the radial direction. According to the magnetic field distribution law, the increase in air gap width leads to a decrease in the radial magnetic flux density component. The reduction in the radial magnetic flux density component directly reduces the radial force wave component in the air gap harmonics, thereby weakening the radial vibration amplitude of the stator teeth and reducing vibration noise from the source.

[0026] In addition, the convergence of the two side walls of the first groove towards the center can reduce the radial magnetic flux distribution when guiding magnetic lines of force around the first groove area, and convert more magnetic flux into tangential components.

[0027] Furthermore, the increase in tangential magnetic flux density means an increase in the electromagnetic torque generated per unit current. Without increasing the amount of magnets used, the power density of the motor can be maintained or improved, solving the problem of "increased air gap leading to reduced efficiency" in traditional solutions. At the same time, the amount of magnets used can be reduced for the same output power, avoiding the problem of increased rotor inertia caused by "thickening the magnets".

[0028] The rotor assembly, motor, and carrier provided by this utility model, since they include the rotor core provided by this utility model, also include all the above-mentioned advantages of the rotor core. Attached Figure Description

[0029] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of a rotor core provided in an embodiment of this utility model;

[0031] Figure 2 for Figure 1 A schematic diagram of one-quarter of the rotor core shown;

[0032] Figure 3 This is a schematic diagram of the slot group of the rotor core provided in the embodiment of this utility model;

[0033] Figure 4 This is a schematic diagram of the structure of the first groove and the second groove provided in the embodiments of this utility model;

[0034] Figure 5 This is a schematic diagram of the structure of the rotor core and stator cooperating in an embodiment of the present utility model;

[0035] Figure 6 This is a comparison and analysis diagram of the torque pulsation of the rotor core provided in this embodiment of the present invention and an existing rotor core;

[0036] Figure 7 This is a comparative analysis diagram of the radial electromagnetic force of the rotor core provided in this embodiment of the present invention and an existing rotor core.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Rotor core; 101. Disc; 102. Slot group; 1021. First magnet slot; 1022. Second magnet slot; 1023. Through hole; 1024. Cooling channel hole; 103. First groove; 1031. First sidewall; 1032. First arc surface; 104. Second groove; 1041. Second sidewall; 1042. Second arc surface; 105. Weight reduction hole; 2. Magnet; 3. Stator; S. Symmetry line. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0040] In related technologies, the common approach to optimizing motor NVH performance is to "thicken the magnet + increase the air gap". This approach increases the magnetic field strength by increasing the magnet thickness, while simultaneously expanding the air gap space to reduce air gap harmonic content, thereby reducing torque ripple and electromagnetic forces during motor operation and improving NVH performance. However, thickening the magnet increases the amount of permanent magnet material used, leading to a significant increase in motor production costs; increasing the air gap weakens the air gap magnetic field strength, reducing the motor's power density and efficiency.

[0041] In order to solve or improve the problem that the use of thickened magnets and increased air gaps to improve NVH performance in related technologies results in high cost and low power density, this utility model provides a rotor core 1, a rotor assembly, a motor and a carrier.

[0042] The following is combined Figures 1 to 7 The rotor core 1 provided in the embodiments of this utility model is described below.

[0043] Specifically, the rotor core 1 includes a disc body 101, a slot group 102, and a first groove 103.

[0044] The disc body 101 can be a stamped disc.

[0045] There are multiple slot groups 102, which are arranged at intervals along the circumference of the disk 101 on the end face of the disk 101. Each slot group 102 is used to mount a magnet 2. Optionally, the magnet 2 can be a permanent magnet 2, such as a magnetic 2. It is understood that the slot groups 102 penetrate the disk 101 along the axial direction of the disk 101.

[0046] There are multiple first grooves 103, which are arranged at intervals along the circumference of the disk body 101 on its outer circumferential surface. Along the radial direction of the disk body 101, each first groove 103 is opposite to a corresponding slot group 102; in other words, along the radial direction of the disk body 101, the outer circumferential portion of the disk body 101 corresponding to the slot group 102 is provided with a corresponding first groove 103. It can be understood that the first groove 103 penetrates both end faces of the disk body 101 along its axial direction.

[0047] The first groove 103 includes two first sidewalls 1031, which are arranged circumferentially along the disk body 101 and are positioned opposite each other. The first sidewalls 1031 are both planar, and the ends of the two first sidewalls 1031 that are away from the center of the disk body 101 are far apart from each other.

[0048] In this design, the two first sidewalls 1031 intersect at their ends near the center of the disk body 101, meaning the two first sidewalls 1031 intersect directly. However, the two first sidewalls 1031 are not limited to a direct intersection. For example, the ends of the two first sidewalls 1031 of the first groove 103 near the center of the disk body 101 can also be connected by a plane or a first arc surface 1032, with the first arc surface 1032 curving towards the center of the disk body 101. Optionally, both ends of the first arc surface 1032 are tangent to the two first sidewalls 1031, respectively.

[0049] When the motor is running, the radial magnetic flux density component of the air gap magnetic field generates a periodic radial electromagnetic force on the stator teeth. This force is the main cause of vibration in the stator 3 structure (and thus noise). The air gap is the physical gap between the stator 3 and the rotor.

[0050] In this embodiment, the first groove 103 is disposed along the outer periphery of the disk 101, causing the air gap at the corresponding position to expand in the radial direction. According to the magnetic field distribution law, the increase in air gap width will lead to a decrease in the radial magnetic flux density component. The reduction in the radial magnetic flux density component directly reduces the radial force wave component in the air gap harmonics, thereby weakening the radial vibration amplitude of the stator teeth and reducing vibration noise from the source.

[0051] In addition, the convergence of the two side walls of the first groove 103 towards the center can reduce the radial magnetic flux distribution when guiding magnetic lines of force around the area of ​​the first groove 103, and convert more magnetic flux into tangential components, that is, increase the tangential magnetic density.

[0052] Furthermore, the increase in tangential magnetic flux density means an increase in the electromagnetic torque generated per unit current. Without increasing the amount of magnets used, the power density of the motor can be maintained or improved, solving the problem of "increased air gap leading to reduced efficiency" in traditional solutions. At the same time, the amount of magnets used can be reduced for the same output power, avoiding the problem of increased rotor inertia caused by "thickening the magnets".

[0053] Optionally, the two first sidewalls 1031 are connected by a first arc surface 1032. Since there are no sharp corners between the two first sidewalls 1031, the inner wall of the first groove 103 forms a smooth transition. That is, the first arc surface 1032 can form a "gradual" air gap width change, so that the radial magnetic flux density component has a smooth downward trend, avoiding the aggravation of magnetic flux density fluctuation caused by abrupt changes in the air gap.

[0054] In addition, the guiding effect of the first arc surface 1032 can further enhance the tangential magnetic flux density component. For example, when the magnetic lines of force pass through the air gap along the tangential direction of the arc surface, the proportion of the tangential component increases, which reduces the excitation of the radial force wave on the stator 3 while maintaining the electromagnetic torque.

[0055] Furthermore, the smooth transition formed by the connection of the first arc surface 1032 can evenly distribute stress in the arc area, preventing stress concentration on the wall and improving the mechanical durability of the rotor core 1. At the same time, the die cutting edge of the arc structure has a rounded transition, resulting in less impact force on the die during stamping, a lower wear rate, and an extended die replacement cycle.

[0056] In addition, the tilt angle of the sidewall can determine the initial direction of the tangential magnetic flux density component, and the curvature of the first arc surface 1032 can control the attenuation rate of the radial magnetic flux density, thereby forming a composite effect of directional enhancement of tangential magnetic flux density and gradient reduction of radial magnetic flux density.

[0057] In some embodiments provided by this utility model, the slot group 102 includes two first magnet slots 1021. The two first magnet slots 1021 are arranged to form a V-shaped structure, and the ends of the two first magnet slots 1021 away from the center of the disk body 101 are far apart from each other, that is, the opening of the V-shaped structure formed by the two first magnet slots 1021 faces the outer periphery of the disk body 101.

[0058] Furthermore, along the radial direction of the disk body 101, each first magnet slot 1021 is provided with a corresponding first groove 103 on the outer periphery of the disk body 101, that is, each first magnet slot 1021 is arranged opposite to the corresponding first groove 103 along the radial direction of the disk body 101.

[0059] In this embodiment, the ends of the two first magnet slots 1021 that are away from the center of the disk 101 are far apart from each other, i.e., the V-shaped openings are arranged outwards, which can enhance the tangential magnetization component of the magnet 2. In addition, along the radial direction of the disk 101, the first grooves 103 corresponding to the first magnet slots 1021 further guide the direction of the magnetic field lines through geometric gaps, making the tangential magnetic flux density distribution closer to a rectangular wave or trapezoidal wave, thereby optimizing the electromagnetic performance.

[0060] In some embodiments provided by this utility model, the slot group 102 further includes a through hole 1023, which is disposed between two first magnet slots 1021. Specifically, the through hole 1023 is disposed within the V-shaped structure formed by the two first magnet slots 1021.

[0061] In this embodiment, the through hole 1023 is located between the two first magnet slots 1021, which can block part of the radial leakage magnetic path. In addition, the through hole 1023 can directly reduce the weight of the rotor core 1, thereby reducing the rotational inertia of the rotor.

[0062] Furthermore, the first magnet slot 1021 is symmetrical about the line of symmetry S extending radially along the disk body 101, and correspondingly, the center of the through hole 1023 coincides with the line of symmetry S. The coincidence of the center of the through hole 1023 with the line of symmetry S ensures a symmetrical distribution of magnetic reluctance in the magnetic bridge region.

[0063] Optionally, the through hole 1023 can be a circular hole or a polygonal hole. The polygonal hole can be a triangular hole or a quadrilateral hole.

[0064] In some embodiments provided by this utility model, the included angle between the two first magnet slots 1021 is 138° to 170°. (See reference) Figure 3 As shown, the included angle between the two first magnet slots 1021 is θ, and the range of θ is 138° to 170°. For example, θ can be 138°, 140°, 145°, 150°, 155°, 160°, 165° or 170°.

[0065] Furthermore, the through hole 1023 is a triangular hole, and the triangular hole is an isosceles triangle with the base of the triangle facing the outer periphery of the disk body 101. The height of the triangle is collinear with the radius of the disk body 101, or in other words, the height of the triangle is collinear with the line of symmetry S. Optionally, the height of the triangle is h, and the range of h is 0.8mm to 1.5mm. For example, h can be 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, or 1.5mm.

[0066] Of course, the through hole 1023 is not limited to a triangular hole; for example, the through hole 1023 can also be a round hole. Optionally, the diameter of the round hole ranges from 0.7 mm to 1 mm, for example, the diameter of the round hole is 0.7 mm, 0.8 mm, 0.9 mm or 1 mm.

[0067] refer to Figure 3 and Figure 4 As shown, in some embodiments provided by this utility model, the two first sidewalls 1031 have different dimensions. Here, the dimension refers to the distance from the end of the first sidewall 1031 near the center of the disk body 101 to the end away from the center of the disk body 101, or the length of the first sidewall 1031.

[0068] Optionally, of the two first sidewalls 1031, the size of the first sidewall 1031 closer to the line of symmetry S is smaller than the size of the first sidewall 1031 farther from the line of symmetry S. This arrangement allows the smaller first sidewall 1031, closer to the line of symmetry S, to form a locally high magnetoresistance barrier, which can attenuate specific order harmonics. The larger first sidewall 1031, farther from the line of symmetry S, can enhance tangential magnetic flux guidance.

[0069] Of course, in some embodiments not shown, the two first sidewalls 1031 may also have the same dimensions.

[0070] In some embodiments of this utility model, the slot assembly 102 further includes two second magnet slots 1022. The two second magnet slots 1022 are arranged to form a V-shaped structure, and the ends of the two second magnet slots 1022 that are away from the center of the disk body 101 are far apart from each other, that is, the opening of the V-shaped structure formed by the two second magnet slots 1022 faces the outer periphery of the disk body 101.

[0071] The second magnet slot 1022 corresponds one-to-one with the first magnet slot 1021, and the second magnet slot 1022 is located on the side of the corresponding first magnet slot 1021 near the center of the disk body 101. In other words, the two first magnet slots 1021 form a V-shaped structure located within the V-shaped structure formed by the two second magnet slots 1022. For example, the two second magnet slots 1022 are symmetrically arranged about the line of symmetry S of the two first magnet slots 1021.

[0072] In this embodiment, the magnet 2 in the second magnet slot 1022 can be used to construct a wide-range magnetic field framework, dominating the fundamental magnetic flux distribution; the magnet 2 in the first magnet slot 1021 can finely control the air gap magnetic field waveform and suppress specific harmonics. At the same time, the magnetic fields of the magnets 2 in the two sets of magnet slots can form a vector superposition in the air gap region. The superposition of the fundamental components enhances the output torque, and the harmonic components cancel each other out due to phase control, thereby optimizing the magnetic field waveform.

[0073] In some embodiments provided by this utility model, the rotor core 1 further includes a second groove 104 disposed on the outer peripheral surface of the disk body 101. Along the radial direction of the disk body 101, each second magnet slot 1022 is provided with a corresponding second groove 104 on the outer peripheral portion of the disk body 101, or in other words, each second magnet slot 1022 is disposed opposite to the corresponding second groove 104 along the radial direction of the disk body 101.

[0074] The second groove 104 includes two second sidewalls 1041. Both second sidewalls 1041 are planar, and the ends of the two second sidewalls 1041 away from the center of the disk body 101 are far apart from each other, while the ends of the two second sidewalls 1041 near the center of the disk body 101 intersect.

[0075] Of course, the ends of the two second sidewalls 1041 near the center of the disk 101 are not limited to intersecting. For example, the ends of the two second sidewalls 1041 near the center of the disk 101 can be connected by a plane or a second arc surface 1042, with the second arc surface 1042 curving towards the center of the disk 101. Optionally, the two ends of the second arc surface 1042 are tangent to the two second sidewalls 1041 respectively.

[0076] In this embodiment, the advantages of the second groove 104 are similar to those of the first groove 103, as discussed above. In addition, the second groove 104 can suppress harmonics introduced by the magnet 2 within the second magnet groove 1022, and the first groove 103 can suppress harmonics introduced by the magnet 2 within the first magnet groove 1021. The two grooves work together to form a dual harmonic filtering effect.

[0077] Optionally, the opening range of the second groove 104 is smaller than the opening range of the first groove 103. The opening range refers to the angular span of the groove in the rotor circumferential direction.

[0078] refer to Figure 3 and Figure 4 As shown, in some embodiments provided by this utility model, the two second sidewalls 1041 have different dimensions. Here, the dimension refers to the distance from the end of the second sidewall 1041 near the center of the disk body 101 to the end away from the center of the disk body 101, or the length of the second sidewall 1041.

[0079] Optionally, of the two second sidewalls 1041, the size of the second sidewall 1041 closer to the line of symmetry S is larger than the size of the second sidewall 1041 farther from the line of symmetry S.

[0080] Of course, in some embodiments not shown, the two second sidewalls 1041 may also have the same dimensions.

[0081] Optionally, the two second sidewalls 1041 are connected by a second arc surface 1042. Since there are no sharp corners between the two second sidewalls 1041, the inner wall of the second groove 104 forms a smooth transition. That is, the second arc surface 1042 can form a "gradual" air gap width change, so that the radial magnetic flux density component has a smooth downward trend, avoiding the aggravation of magnetic flux density fluctuation caused by abrupt changes in the air gap.

[0082] In addition, the guiding effect of the second arc surface 1042 can further enhance the tangential magnetic flux density component. For example, when the magnetic lines of force pass through the air gap along the tangential direction of the arc surface, the proportion of the tangential component increases, which reduces the excitation of the radial force wave on the stator 3 while maintaining the electromagnetic torque.

[0083] Furthermore, the smooth transition formed by the second arc surface 1042 can evenly distribute stress in the arc area, preventing stress concentration on the wall and improving the mechanical durability of the rotor core 1. At the same time, the die cutting edge of the arc structure has a rounded transition, resulting in less impact force on the die during stamping, a lower wear rate, and an extended die replacement cycle.

[0084] In addition, the tilt angle of the second sidewall 1041 can determine the initial direction of the tangential magnetic flux density component, and the curvature of the second arc surface 1042 can control the attenuation rate of the radial magnetic flux density, thereby forming a composite effect of directional enhancement of tangential magnetic flux density and gradient reduction of radial magnetic flux density.

[0085] In some embodiments provided by this utility model, the slot group 102 further includes a cooling channel hole 1024, which is disposed between the two second magnet slots 1022. Specifically, the cooling channel hole 1024 is disposed between the ends of the two second magnet slots 1022 near the center of the disk body 101.

[0086] In this embodiment, the cooling channel holes 1024 can form a magnetic reluctance barrier, forcing magnetic lines of force to deflect into the air gap, thereby reducing the leakage magnetic flux of the magnet 2 within the second magnet slot 1022 and increasing the power density. Additionally, the cooling channel holes 1024 have a heat dissipation function. Located between the second magnet slots 1022 and closer to the magnet 2 within them, the cooling channel holes 1024 can provide better heat dissipation for the magnet 2 and suppress temperature rise.

[0087] In some embodiments provided by this utility model, the rotor core 1 further includes a weight reduction hole 105, which is disposed between two second magnet slots 1022 of two adjacent slot groups 102. The weight reduction hole 105 can reduce the weight of the rotor core 1, thereby reducing the rotational inertia of the rotor core 1 and thus shortening the acceleration and deceleration response time of the motor.

[0088] refer to Figure 4 As shown, in some embodiments provided by this utility model, the included angle between the two first sidewalls 1031 of the first groove 103 is 130° to 155°. For example, the included angle between the first sidewalls 1031 is γ1, and the range of γ1 is 130° to 155°. For example, γ1 can be 130°, 135°, 140°, 145°, 150° or 155°.

[0089] refer to Figure 4 As shown, in some embodiments provided by this utility model, the included angle between the two second sidewalls 1041 of the second groove 104 is 130° to 155°. For example, the included angle between the second sidewalls 1041 is γ2, and the range of γ2 is 130° to 155°. For example, γ2 can be 130°, 135°, 140°, 145°, 150° or 155°.

[0090] refer to Figure 2 As shown, in some embodiments provided by this utility model, the two first magnet slots 1021 are radially symmetrical. Obviously, the line of symmetry S of the two first magnet slots 1021 extends radially along the disk body.

[0091] Accordingly, the angle between the line connecting the centers of the disk body 101 and the first arc surface 1032 and the line of symmetry S is 4° to 7°. For example, if the angle between the line connecting the centers of the disk body 101 and the first arc surface 1032 and the line of symmetry S is α, then α is in the range of 4° to 7°. For example, α can be 4°, 4.5°, 5°, 5.5°, 6°, 6.5°, or 7°.

[0092] refer to Figure 2 As shown, in some embodiments provided by this utility model, the two first magnet slots 1021 are radially symmetrical. Clearly, the line of symmetry S of the two first magnet slots 1021 extends radially along the disk body. The two second magnet slots 1022 are symmetrical about the line of symmetry S.

[0093] Accordingly, the angle between the line connecting the centers of the disk 101 and the second arc surface 1042 and the line of symmetry S is 15° to 22.5°. For example, if the angle between the line connecting the centers of the disk 101 and the first arc surface 1032 and the line of symmetry S is β, then β ranges from 15° to 22.5°. For example, β can be 15°, 15.5°, 16°, 16.5°, 17°, 17.5°, 18°, 18.5°, 19°, 19.5°, 20°, 20.5°, 21°, 21.5°, 22°, or 22.5°.

[0094] Of course, the features in the above embodiments can be combined with each other. For example, in some embodiments provided by this utility model, the rotor core 1 includes a disc body 101, a slot group 102, a first groove 103, and a second groove 104. There are multiple first grooves 103, which are arranged at intervals along the circumference of the disc body 101 on the outer circumferential surface of the disc body 101. There are multiple second grooves 104, which are arranged at intervals along the circumference of the disc body 101 on the outer circumferential surface of the disc body 101.

[0095] There are multiple slot groups 102, which are arranged at intervals along the circumference of the disk body 101 on the end face of the disk body 101. The slot group 102 includes two first magnet slots 1021, two second magnet slots 1022, through holes 1023, and cooling channel holes 1024.

[0096] The two first magnet slots 1021 are arranged in a V-shape, and the ends of the two first magnet slots 1021 that are away from the center of the disk body 101 are far apart from each other. The first magnet slots 1021 are symmetrical about the line of symmetry S extending radially along the disk body 101, and the included angle between the two first magnet slots 1021 is 138° to 170°.

[0097] Along the radial direction of the disk body 101, each first magnet slot 1021 has a corresponding first groove 103 on the outer periphery of the disk body 101. A through hole 1023 is provided between two first magnet slots 1021, specifically, the through hole 1023 is provided in the V-shaped structure formed by the two first magnet slots 1021, and the center of the through hole 1023 coincides with the line of symmetry S.

[0098] The through hole 1023 is a triangular hole, and the cross-section of the triangular hole is an isosceles triangle. The base of the triangle faces the outer periphery of the disk body 101, and the height of the triangle is collinear with the radius of the disk body 101. For example, the height of the triangle is h, and the range of h is 0.8mm to 1.5mm.

[0099] Two second magnet slots 1022 are arranged in a V-shape, with the ends of the two second magnet slots 1022 furthest from the center of the disk body 101 being far apart from each other. The two second magnet slots 1022 are symmetrically arranged about the line of symmetry S of the two first magnet slots 1021. Each second magnet slot 1022 corresponds one-to-one with a first magnet slot 1021, and the second magnet slot 1022 is located on the side of the corresponding first magnet slot 1021 closest to the center of the disk body 101. In other words, the V-shape formed by the two first magnet slots 1021 is located within the V-shape formed by the two second magnet slots 1022. A cooling channel hole 1024 is provided between the two second magnet slots 1022.

[0100] Along the radial direction of the disk body 101, each second magnet slot 1022 is provided with a corresponding second groove 104 on the outer periphery of the disk body 101. In other words, each magnet slot 2 is arranged opposite to the corresponding second groove 104 along the radial direction of the disk body 101.

[0101] The first groove 103 includes two first sidewalls 1031, which are arranged circumferentially along the disk body 101 and are positioned opposite each other. Both first sidewalls 1031 are planar, and the ends of the two first sidewalls 1031 furthest from the center of the disk body 101 are far apart. The ends of the two first sidewalls 1031 of the first groove 103 near the center of the disk body 101 are connected by a first arc surface 1032, which curves towards the center of the disk body 101. The included angle between the two first sidewalls 1031 of the first groove 103 is 130° to 155°. The angle between the line connecting the centers of the disk body 101 and the first arc surface 1032 and the line of symmetry S is 4° to 7°.

[0102] The second groove 104 includes two second sidewalls 1041, both of which are planar. The ends of the two sidewalls 1041 furthest from the center of the disk body 101 are far apart, while the ends of the two sidewalls 1041 closest to the center of the disk body 101 are connected by a second arc surface 1042, which curves towards the center of the disk body 101. The included angle between the two second sidewalls 1041 of the second groove 104 is 130° to 155°. The angle between the line connecting the centers of the disk body 101 and the second arc surface 1042 and the line of symmetry S is 15° to 22.5°.

[0103] In this embodiment, reference is made to Figure 6 The diagram shown is a comparison analysis of the torque pulsation of the rotor core 1 of this application and the existing rotor core 1.

[0104] Figure 6 In this diagram, L1 represents the 36th order torque ripple of the existing rotor core, and L2 represents the 36th order torque ripple of the rotor core after optimization based on the scheme of this embodiment. The torque ripple of L2 is less than that of L1.

[0105] Figure 6 In this diagram, L3 represents the 18th-order torque ripple of the existing rotor core, and L4 represents the 18th-order torque ripple of the rotor core after optimization according to this embodiment. The torque ripple of L4 is less than that of L3. Figure 6 It can be seen that by optimizing rotor core 1 according to this embodiment, the torque pulsation of rotor core 1 can be reduced.

[0106] refer to Figure 7 The diagram shown is a comparative analysis of the radial electromagnetic force of the rotor core 1 of this application and the existing rotor core 1.

[0107] Figure 7 In this diagram, L1 represents the 36th order radial electromagnetic force of the existing rotor core, and L2 represents the 36th order radial electromagnetic force of the rotor core after optimization according to the scheme of this embodiment. The radial electromagnetic force of L2 is less than that of L1.

[0108] Figure 7 In this diagram, L3 represents the 54th order radial electromagnetic force of the existing rotor core, and L4 represents the 54th order radial electromagnetic force of the rotor core after optimization according to this embodiment. The radial electromagnetic force of L4 is less than that of L3. Figure 7 It can be seen that by optimizing the rotor core 1 according to this embodiment, the radial electromagnetic force of the rotor core 1 can be reduced.

[0109] This utility model embodiment also provides a rotor assembly.

[0110] Specifically, the rotor assembly includes a magnet 2 and a rotor core 1 as described above. The magnet 2 is disposed in the slot group 102.

[0111] It should be noted that the rotor assembly includes rotor core 1, and therefore includes all the advantages of rotor core 1 mentioned above.

[0112] This embodiment of the invention also provides a motor. The motor here can be an electric motor or a generator.

[0113] Specifically, the motor includes the rotor core 1 as described above or the rotor assembly as described above. For example, refer to... Figure 5 As shown, the rotor core 1 is located inside the stator 3.

[0114] It should be noted that the motor includes rotor core 1, and therefore includes all the advantages of rotor core 1 mentioned above.

[0115] This utility model embodiment also provides a vehicle, including but not limited to vehicles, aircraft and ships.

[0116] Specifically, the carrier includes the rotor core 1 as described above, the rotor assembly as described above, or the motor as described above.

[0117] It should be noted that the carrier includes rotor core 1, and therefore includes all the advantages of rotor core 1 mentioned above.

[0118] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A rotor core characterized by, include: Disk body (101); Multiple slot groups (102) are arranged at intervals along the circumference of the disk body (101) on the end face of the disk body (101), and are all used to install magnets (2); Multiple first grooves (103) are arranged at intervals on the outer peripheral surface of the disk body (101) along the circumferential direction of the disk body (101). Along the radial direction of the disk body (101), each of the first grooves (103) is opposite to the corresponding slot group (102). Each first groove (103) includes a first sidewall (1031). Both first sidewalls (1031) are planar and their ends away from the center of the disk body (101) are far apart from each other. The two first sidewalls (1031) intersect at one end near the center of the disk body (101), or are connected by a plane or a first arc surface (1032), the first arc surface (1032) curving toward the center of the disk body (101).

2. The rotor core according to claim 1, characterized by The slot group (102) includes two first magnet slots (1021), which are arranged to form a V-shaped structure. The ends of the two first magnet slots (1021) away from the center of the disk body (101) are far apart from each other. Along the radial direction of the disk body (101), the outer peripheral portion of the disk body (101) corresponding to each first magnet slot (1021) is provided with a corresponding first groove (103).

3. The rotor core according to claim 2, characterized by The slot group (102) further includes a through hole (1023), which is disposed within the V-shaped structure formed by the first magnet slot (1021); And / or, the included angle between the two first magnet slots (1021) is 138° to 170°.

4. The rotor core according to any one of claims 2-3, characterized in that, The slot group (102) further includes two second magnet slots (1022). The two second magnet slots (1022) are arranged to form a V-shaped structure, and the ends of the two second magnet slots (1022) away from the center of the disk body (101) are far apart from each other. The second magnet slots (1022) correspond one-to-one with the first magnet slots (1021) and are located on the side of the first magnet slots (1021) near the center of the disk body (101).

5. The rotor core according to claim 4, characterized by The rotor core (1) further includes a second groove (104) on the outer peripheral surface of the disk body (101). Along the radial direction of the disk body (101), the outer peripheral portion of the disk body (101) corresponding to each second magnet slot (1022) is provided with a corresponding second groove (104). The second groove (104) includes two second sidewalls (1041). Both second sidewalls (1041) are planar and their ends away from the center of the disk body (101) are far apart from each other. The ends of the two second sidewalls (1041) near the center of the disk body (101) intersect or are connected by a plane or a second arc surface (1042). The second arc surface (1042) bends toward the center of the disk body (101). And / or, the slot group (102) further includes a cooling channel hole (1024) disposed between the two second magnet slots (1022); And / or, the rotor core (1) further includes a weight reduction hole (105), which is disposed between two second magnet slots (1022) of two adjacent slot groups (102).

6. The rotor core according to claim 5, characterized by The included angle between the two first sidewalls (1031) of the first groove (103) is 130° to 155°; And / or, the included angle between the two second sidewalls (1041) of the second groove (104) is 130° to 155°.

7. The rotor core according to claim 5, characterized by The two first magnet slots (1021) are radially symmetrical, and the two second magnet slots (1022) are symmetrical about the line of symmetry (S) of the two first magnet slots (1021); Wherein, the angle between the line connecting the center of the disk body (101) and the center of the first arc surface (1032) and the line of symmetry (S) is 4° to 7°, and / or, the angle between the line connecting the center of the disk body (101) and the center of the second arc surface (1042) and the line of symmetry (S) is 15° to 22.5°.

8. A rotor assembly, characterized in that, It includes a magnet (2) and a rotor core (1) as described in any one of claims 1-7.

9. An electric machine characterized by It includes the rotor core (1) as described in any one of claims 1-7 or the rotor assembly as described in claim 8.

10. A carrier, characterized by It includes the rotor core (1) as described in any one of claims 1-7, the rotor assembly as described in claim 8, or the motor as described in claim 9.

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