An electric motor, a by-wire device, and an electric vehicle

Abstract

The application relates to the technical field of motors, in particular to a motor, a drive-by-wire device and an electric vehicle. The motor comprises a rotor and a stator, the stator is used for generating a magnetic field to drive the rotor to rotate, the rotor comprises a rotor core and a plurality of magnetic steels, and the rotor core is used for fixing the plurality of magnetic steels. The outer circumferential surface of the rotor core comprises a plurality of rows of radial protrusions, each row of radial protrusions is arranged along the axial direction of the motor, the direction of each row of radial protrusions deviates from the axis of the motor along the radial direction of the motor, and the plurality of rows of radial protrusions are distributed at intervals along the circumferential direction of the motor. The gap between two adjacent rows of radial protrusions serves as a magnetic steel slot, each magnetic steel slot is used for accommodating one magnetic steel, and each row of radial protrusions comprises a plurality of circumferential protrusions on the two sides thereof, each circumferential protrusion faces another adjacent row of radial protrusions along the circumferential direction of the motor, and each circumferential protrusion is used for abutting against the surface of the magnetic steel deviating from the slot bottom of the magnetic steel slot. The motor can reduce the rotor structure and cost, and improve the power density and electromagnetic performance of the motor.

Description

Technical Field

[0001] This application relates to the field of motor technology, and in particular to a motor, a drive-by-wire device, and an electric vehicle. Background Technology

[0002] In the field of motor technology, torque density, moment of inertia, and cost are key factors frequently considered during the design and manufacturing process. With the rapid development of automation industries such as industrial automation, robotics, and electric vehicles, the demands on motor performance are constantly increasing.

[0003] Taking the electric vehicle industry as an example, small motors are increasingly used in braking and steering functions. To improve output performance, small motors generally use surface-mount rotors. In traditional technology, surface-mount rotors fix the surface magnets by injection molding and fastening steel sleeves, which is complex and costly to assemble, and also reduces the electromagnetic performance of the electrodes due to the need for structural avoidance. Utility Model Content

[0004] This application provides an electric motor, a drive-by-wire device, and an electric vehicle, wherein the rotor core can fix the magnets, reducing the structure of the rotor and simplifying the assembly difficulty of the rotor.

[0005] In a first aspect, this application provides an electric motor including a rotor and a stator. The stator is used to generate a magnetic field to drive the rotor to rotate. The rotor includes a rotor core and a plurality of magnets. The rotor core is used to fix the plurality of magnets. The outer circumferential surface of the rotor core includes multiple rows of radial protrusions. Each row of radial protrusions is arranged along the axial direction of the motor. The orientation of each row of radial protrusions is away from the axis of the motor along the radial direction of the motor. The multiple rows of radial protrusions are spaced apart along the circumferential direction of the motor. The gap between two adjacent rows of radial protrusions serves as a magnet slot. Each magnet slot is used to accommodate one magnet. Each side of each row of radial protrusions includes a plurality of circumferential protrusions. Each circumferential protrusion faces the adjacent row of radial protrusions along the circumferential direction of the motor. Each circumferential protrusion is used to abut against the surface of the magnet away from the bottom of the magnet slot.

[0006] In the aforementioned motor, the rotor is assembled, with a magnet inserted into a magnet slot along the motor's axial direction. The magnet's two circumferential sides are circumferentially limited by two rows of adjacent radial protrusions. The surface of the magnet facing the motor's axis along the radial direction contacts the bottom of the magnet slot. The circumferential protrusions of the two rows of adjacent radial protrusions cooperate with the bottom of the magnet slot to radially limit the magnet. Compared to traditional surface-mount rotor designs, the rotor laminations provided in this application can eliminate the need for injection-molded bodies and steel sleeves for fixing the magnets, reducing structure and cost, improving assembly difficulty, and also reducing the rotor's radial dimensions, thereby increasing the motor's power density and electromagnetic performance. When the rotor is assembled with the stator to form a motor, the air gap between the rotor and stator can be further reduced, thereby increasing the motor's power density.

[0007] In one embodiment, the bottom of each magnet slot includes a first groove. The dimension of the first groove along the motor axial direction is larger than the dimension of the rotor lamination of the rotor core along the motor axial direction. The bottom of the first groove includes multiple tongues, which are spaced apart along the motor axial direction. The dimension of each tongue along the motor circumference is smaller than the dimension of the first groove along the motor circumference, the dimension of the tongue along the motor axial direction is smaller than the dimension of the first groove along the motor axial direction, and the dimension of the tongue along the motor radial direction is larger than the dimension of the first groove along the motor radial direction. Each tongue is used to abut against the surface of the magnet facing the motor axis. When the magnet is assembled into a magnet slot, the tongue is bent and deformed by the pressure of the magnet. The deformed tongue has a springback tendency and exerts a force on the magnet to press it against the circumferential protrusion, so that a sufficiently large frictional force is generated between the magnet and the circumferential protrusion to achieve axial positioning of the magnet.

[0008] In one embodiment, each rotor lamination in the rotor core includes multiple first notches and multiple radial protrusions. Each first notch is distributed between two adjacent radial protrusions. The first notches of two adjacent rotor laminations along the motor axis are connected to form a first groove. At least one of the two adjacent rotor laminations also includes multiple tongues, each tongue extending out of the first notch in a direction opposite to the motor axis. After multiple rotor laminations are stacked, multiple rows of radial protrusions and multiple second grooves are formed, constituting a magnet slot for mounting and fixing multiple magnets. Fixing the magnets through the structure of the rotor core itself can further simplify the rotor structure. The cooperation between the first notches and the tongues increases the overhang of the tongues, which can increase the degree of freedom of the tongues when bent under force. On the one hand, it can reduce the resistance to magnet insertion, and on the other hand, it can increase the reaction force generated by the bending of the tongues.

[0009] In one embodiment, the bottom of each magnet slot includes a second groove. The dimension of each second groove along the motor axial direction is larger than the dimension of the rotor lamination of the rotor core along the motor axial direction. The opening of the second groove faces away from the motor axis along the radial direction of the motor. The depth of the second groove is less than its width. The second groove is used to accommodate an adhesive material for bonding the bottom of the magnet slot and the magnet. When the magnet is assembled into a magnet slot, a gap exists between the magnet and the bottom of the magnet slot where the second groove is located. Filling this gap with adhesive allows the magnet to be fixed to the magnet slot, achieving axial positioning of the magnet.

[0010] In one embodiment, each rotor lamination in the rotor core includes multiple second notches and multiple radial protrusions. Each second notch of the rotor lamination is distributed between two adjacent radial protrusions, and the width of the second notch is greater than its depth. Along the axial direction of the motor, each second notch of each rotor lamination sequentially connects to another second notch of an adjacent rotor lamination to form a second groove. After multiple rotor laminations are stacked, multiple rows of radial protrusions and multiple second grooves are formed, constituting magnet slots for mounting and fixing multiple magnets. By fixing the magnets through the structure of the rotor core itself, the rotor structure can be further simplified.

[0011] In one embodiment, each row of radial protrusions includes multiple first radial protrusions and multiple second radial protrusions. The size of each first radial protrusion is smaller than the size of each second radial protrusion along the radial direction of the motor, and the size of each first radial protrusion is smaller than the size of each second radial protrusion along the circumferential direction of the motor. Each second radial protrusion includes two circumferential protrusions, and the two circumferential protrusions of each second radial protrusion face away from each other along the circumferential direction of the motor. The first and second radial protrusions cooperate to form a row of radial protrusions for limiting the magnets. The first radial protrusions can be used to space the magnets, and the two circumferential protrusions of the second radial protrusions can be used to radially limit the magnets. Reducing the number of radial protrusions forming the circumferential protrusions simplifies the rotor core structure design.

[0012] In one embodiment, each second radial protrusion includes a first segment and a second segment. The distance between the first segment and the motor axis along the radial direction of the motor is less than the distance between the second segment and the motor axis. The dimension of the first segment along the circumferential direction of the motor is less than the dimension of the second segment. The shape and size of the first segment in each second radial protrusion are the same as the shape and size of the first radial protrusion. Two circumferential protrusions of each second radial protrusion are distributed in the second segment of the second radial protrusion. The second segment can form a stepped structure with the first segment to radially limit the movement of the magnet.

[0013] In one embodiment, the rotor laminations of the rotor core include multiple first rotor laminations and multiple second rotor laminations, with the number of first rotor laminations being greater than the number of second rotor laminations. Each first rotor lamination includes multiple first radial protrusions, which are sequentially spaced along the circumference of the first rotor lamination. Each second rotor lamination includes multiple second radial protrusions, which are sequentially spaced along the circumference of the second rotor lamination. The first and second rotor laminations have different structures, and their adjacent stacking can form a magnet slot for mounting and fixing multiple magnets. Each lamination can be formed from a silicon steel sheet through a one-piece forming process such as stamping and shearing. In actual production, the number and arrangement of the first and second rotor laminations can be adjusted according to the load requirements of the motor.

[0014] In one embodiment, the rotor laminations of the rotor core include a plurality of first notches, each first notch in each first rotor lamination being distributed between two adjacent first radial protrusions, and each first notch in each first rotor lamination being distributed between two adjacent second radial protrusions, wherein: each second rotor lamination further includes a plurality of tongues, each tongue extending out of the first notch of the second rotor lamination in a direction opposite to the axis of the motor. The first notches and tongues of the first rotor laminations cooperate to form a structure for spring-loaded fixing of the magnets.

[0015] In one embodiment, multiple first rotor laminations are arranged sequentially adjacent to each other on one side of a second rotor lamination, and the inclination direction of each tongue of the second rotor lamination is along the axial direction of the motor toward the first notch of the first rotor lamination. When assembling the magnet, the tongue of the magnet, which is bent, can be bent into the first notch of the first rotor lamination to achieve structural avoidance.

[0016] In one embodiment, the rotor laminations of the rotor core include multiple sets of second notches. Each set of second notches in each first rotor lamination is distributed between two adjacent first radial protrusions, and each set of second notches in each second rotor lamination is distributed between two adjacent second radial protrusions. Each set of second notches includes two second notches, the width of which is greater than its depth. The interval between the two second notches in each set of second notches in each first rotor lamination is less than the interval between each second notch and a first radial protrusion. Similarly, the interval between the two second notches in each set of second notches in each second rotor lamination is less than the interval between each second notch and a second radial protrusion. The second notches are used to form part of a second groove to accommodate adhesive material.

[0017] In one embodiment, each row of radial protrusions includes at least one set of first radial protrusions. Each set of first radial protrusions includes one first radial protrusion or multiple first radial protrusions arranged sequentially adjacent to each other along the axial direction of the motor. Each set of first radial protrusions is arranged along the axial direction of the motor on one side of the second radial protrusion. The first radial protrusions abut against the second radial protrusions, which can provide structural support for the second radial protrusions and reduce the risk of warping of the rotor laminations with the second radial protrusions under stress.

[0018] In one embodiment, each row of radial protrusions includes multiple sets of second radial protrusions, each set of second radial protrusions includes one second radial protrusion or second radial protrusions arranged sequentially adjacent to each other along the axial direction of the motor, and the multiple sets of second radial protrusions in each row of radial protrusions are spaced apart along the axial direction of the motor.

[0019] Secondly, this application provides a drive-by-wire device, which includes a motor controller and any of the motors provided in the first aspect. The motor controller is used to control the motor to provide power to at least one of the braking device, steering device, or suspension device of an electric vehicle. This motor occupies less space, has higher electromagnetic performance and power density, and can improve the power performance of the drive-by-wire device.

[0020] Thirdly, this application provides an electric vehicle, which includes a braking device, a steering device, a suspension device, and any one of the drive-by-wire devices provided in the second aspect above, wherein the drive-by-wire device is used to provide power to at least one of the braking device, the steering device, or the suspension device.

[0021] For the technical effects that can be achieved in the second and third aspects mentioned above, please refer to the description of the technical effects that can be achieved by the corresponding design scheme in the first aspect mentioned above. This application will not repeat them here. Attached Figure Description

[0022] Figure 1a This application provides a schematic diagram of the structure of an electric vehicle;

[0023] Figure 1b An electrical connection diagram of a wired control device is provided in the application embodiment;

[0024] Figure 2 This application provides a schematic diagram of the structure of a motor;

[0025] Figure 3a A schematic diagram of a rotor provided in an embodiment of this application;

[0026] Figure 3b for Figure 3a A magnified view of the details at V1 in the middle;

[0027] Figure 4a An exploded view of a rotor provided in an embodiment of this application;

[0028] Figure 4b for Figure 4a Enlarged detail image of V2 in the middle;

[0029] Figure 4c A partial structural schematic diagram of the rotor of the motor provided in an embodiment of this application;

[0030] Figure 5a This is a partial structural schematic diagram of the rotor core of the motor provided in an embodiment of this application;

[0031] Figure 5b A schematic diagram of the structure of the second radial protrusion of the rotor core of the motor provided in the embodiments of this application;

[0032] Figure 5c A schematic diagram of the structure of the first radial protrusion and the second radial protrusion of the rotor core of the motor provided in the embodiment of this application;

[0033] Figure 5d A partial structural schematic diagram of the rotor of the motor provided in an embodiment of this application;

[0034] Figure 6a A schematic diagram of the structure of the first rotor lamination of the motor provided in an embodiment of this application;

[0035] Figure 6b This is a schematic diagram of the structure of the second rotor lamination of the motor provided in an embodiment of this application;

[0036] Figure 6c A schematic diagram of the structure of the first rotor lamination and the second rotor lamination of the motor provided in the embodiments of this application;

[0037] Figure 7a A schematic diagram of a rotor provided in an embodiment of this application;

[0038] Figure 7b An exploded view of a rotor provided in an embodiment of this application;

[0039] Figure 7c for Figure 7b Enlarged detail image of V3 in the middle;

[0040] Figure 7d A partial structural schematic diagram of the rotor of the motor provided in an embodiment of this application;

[0041] Figure 8 This is a partial structural schematic diagram of the rotor core of the motor provided in an embodiment of this application;

[0042] Figure 9a A schematic diagram of the structure of the first rotor lamination of the motor provided in an embodiment of this application;

[0043] Figure 9b for Figure 9a Enlarged detail image of V4 in the middle;

[0044] Figure 10a This is a schematic diagram of the structure of the second rotor lamination of the motor provided in an embodiment of this application;

[0045] Figure 10b for Figure 10a Enlarged detail image of V5 in the middle;

[0046] Figure 11a A schematic diagram of the structure of the first rotor lamination and the second rotor lamination of the motor provided in the embodiments of this application;

[0047] Figure 11b for Figure 11a A magnified view of the details at V6.

[0048] Figure label:

[0049] 1000 - Drive-by-wire device; 2000 - Suspension system; 3000 - Steering system; 4000 - Braking system; 5000 - Wheels;

[0050] 100 - Motor; 200 - Motor controller; 300 - Power supply;

[0051] 10-Rotor; 20-Stator; 30-Motor shaft; 40-Glue material;

[0052] 1-Rotor core; 11-First rotor lamination; 12-Second rotor lamination; 2-Magnet;

[0053] C1 - First groove; C2 - Second groove; F - Air gap; N - Air clearance; P - Magnet slot; Q - Shaft hole; T1 - Radial protrusion; T11 - First radial protrusion; T12 - Second radial protrusion; T121 - First section; T122 - Second section; T2 - Circumferential protrusion; c1 - First notch; c2 - Second notch; p1 - First groove; p2 - Second groove; q - Center hole; q1 - First center hole; q2 - Second center hole; t - Tongue. Detailed Implementation

[0054] To improve output performance, permanent magnet motors can employ a surface-mount rotor structure. This involves fixing the magnets to the rotor core surface using injection molding and a steel sleeve. While the surface-mount rotor design is a mature technology that reliably secures the magnets, it requires additional investment in injection molding and steel sleeve assembly plants, resulting in high production costs. Furthermore, the steel sleeve structure, used to secure the magnets, occupies the air gap between the rotor and stator. To accommodate the steel sleeve, the motor needs a larger air gap, which reduces its electromagnetic performance.

[0055] Based on this, embodiments of this application provide a rotor lamination for fixing magnets, a rotor, a motor, and a power assembly. The rotor lamination can be used to fix magnets, which can reduce rotor structure, reduce assembly difficulty, and improve the electromagnetic performance of the motor.

[0056] To make the objectives, technical solutions, and advantages of this application clearer, the application will now be described in further detail with reference to the accompanying drawings.

[0057] The terminology used in the following embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” “the,” “the,” “the,” and “this” are intended to also include expressions such as “one or more” unless the context clearly indicates otherwise.

[0058] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0059] Figure 1a This is a structural schematic diagram of an electric vehicle provided as an embodiment of this application. Figure 1a As shown, the electric vehicle includes wheels 5000, a suspension system 2000, a steering system 3000, and a braking system 4000. The suspension system 2000 is responsible for transmitting the vertical, longitudinal, and lateral reaction forces acting on the wheels 5000 from the road surface, as well as the torques generated by these reaction forces, to the vehicle body to ensure normal vehicle operation. The steering system 3000 can control the rotation direction of the wheels 5000 according to the driver's wishes, thereby changing the vehicle's direction of travel. The braking system 4000 can apply braking force to the wheels 5000 as needed to decelerate the vehicle or stop it within the shortest possible distance, ensuring driving safety.

[0060] This application provides embodiments such as Figure 1b The diagram shows a wired control device 1000, which includes a motor controller 200 and a motor 100. The motor controller 200 controls the operation of the motor 100 to output power. The motor 100 is used in... Figure 1a When the electric vehicle shown is used, it can provide power to at least one of the suspension system 2000, steering system 3000, and braking system 4000. The motor 100 is supplied with electrical energy through the power source 300, and the motor 100 can convert electrical energy into mechanical energy for output.

[0061] Figure 2 This is a cross-sectional structural diagram of a motor 100 provided in an embodiment of this application. Figure 2As shown, the motor 100 includes a rotor 10 and a stator 20. The stator 20 is sleeved on the rotor 10, and the coils on the stator 20 are energized to generate a magnetic field, thereby driving the rotor 10 to rotate. In one embodiment, the motor 100 also includes a motor shaft 30, and the rotor 10 is coaxially fixed to the motor shaft 30. The rotor 10 can drive the motor shaft 30 to rotate around the axis of the motor shaft 30, and the motor shaft 30 can output rotational mechanical energy.

[0062] Please continue to refer to Figure 2 As shown, along the radial direction R of the motor 100, there is an air gap F between the inner circumferential surface of the stator 20 and the outer circumferential surface of the rotor 10. The air gap F prevents the stator 20 from contacting the rotor 10, ensuring the stable rotation of the rotor 10. The size and uniformity of the air gap F affect the magnetic field distribution of the motor 100, and thus affect the electromagnetic performance of the motor 100. Here, the axial direction A of the motor 100 refers to the axial direction of the motor shaft 30, the rotor 10, and the stator 20; the radial direction R of the motor 100 refers to the radial direction of the motor shaft 30, the rotor 10, and the stator 20; and the circumferential direction C of the motor 100 refers to the circumferential direction of the motor shaft 30, the rotor 10, and the stator 20.

[0063] This application provides a rotor 10, which is a surface-mounted permanent magnet motor rotor. For example... Figure 3a As shown, the rotor 10 includes a rotor core 1 and a plurality of magnets 2, the rotor core 1 being used to fix the plurality of magnets 2. In one embodiment, the plurality of magnets 2 are surface-fixed to the rotor core 1. Figure 3a This is a schematic diagram of the assembly structure of rotor 10. Figure 3b for Figure 3a A magnified view of the details at V1.

[0064] In one embodiment, a plurality of magnets 2 are arranged at intervals along the circumference of the motor 100, with any two adjacent magnets 2 spaced apart and not in contact with each other along the circumference of the motor 100. The rotor core 1 includes multiple rows of radial protrusions T1, each row of radial protrusions T1 arranged along the axial direction of the motor 100, with the orientation of each row of radial protrusions T1 facing away from the axis of the motor 100 along the radial direction of the motor 100. The multiple rows of radial protrusions T1 are distributed at intervals along the circumference of the motor 100. The gap between two adjacent rows of radial protrusions T1 serves as a magnet slot P, and each magnet slot P is used to accommodate one magnet 2. Figure 3a and Figure 3b The dashed box in the middle shows a row of radial protrusions T1. Each row of radial protrusions T1 is arranged circumferentially between two adjacent magnets 2 along the circumference of the motor 100, which can limit the circumferential movement of the magnets 2.

[0065] Taking a row of radial protrusions T1 as a whole, refer to... Figure 3a and Figure 3b As shown, each row of radial protrusions T1 includes multiple circumferential protrusions T2 on both sides of the motor 100 along the circumference. Each circumferential protrusion T2 faces the adjacent row of radial protrusions T1 along the circumference of the motor 100. Each circumferential protrusion T2 is used to abut against the surface of the magnet 2 away from the bottom of the magnet slot P, which can realize the radial positioning of the magnet 2 along the motor 100.

[0066] In some embodiments, the structural edges of each radial protrusion T1 and each circumferential protrusion T2 are rounded to avoid scratching or damaging the magnet 2.

[0067] In one embodiment, the rotor core 1 of the rotor 10 includes a shaft hole Q, which penetrates the rotor core 1 along the axial direction of the motor 100. The shaft hole Q is used for the motor shaft 30 to pass through, and the shaft hole Q can be coaxially fixed to the motor shaft 30, thereby fixing the rotor 10 to the motor shaft 30. The axial direction of the shaft hole Q is the axial direction of the motor 100. Based on the structure of multiple rows of radial protrusions T1, multiple magnetic slots P can be formed on the circumferential surface of the rotor core 1. The multiple magnetic slots P are distributed at intervals along the circumferential direction of the motor, and each magnetic slot P is used to install and fix a magnet 2.

[0068] This application embodiment provides a motor 100 in which the rotor core 1 can limit and fix the magnet 2. Compared with the traditional surface-mounted rotor design, this structure can reduce the need for the injection-molded body and steel sleeve used to fix the magnet 2, reduce the structure and cost of the rotor 10, and improve assembly difficulty. This design can also reduce the radial dimension of the rotor 10. For the motor 100, with a rotor 10 having a smaller radial dimension, the stator 20 can reserve a smaller air gap space to accommodate the rotor 10, which can improve the power density of the motor 100 and improve the electromagnetic performance of the motor 100.

[0069] Figure 4a This is an exploded view of the rotor core 1 of rotor 10 separated from multiple magnets 2 in one embodiment. Figure 4a As shown, the rotor core 1 includes multiple rotor laminations, which are stacked along the axial direction of the motor 100 to form the rotor core 1. Each rotor lamination includes a central hole q that penetrates the rotor lamination along the axial direction of the motor 100, and the central hole q is coaxial with the axis of the rotor lamination. The multiple rotor laminations stacked along the axial direction of the motor 100 constitute the rotor core 1, and the central holes q of the multiple rotor laminations can communicate along the axial direction of the motor 100 to form a shaft hole Q. A row of radial protrusions T1 is indicated by a dashed box.

[0070] In one embodiment, such as Figure 4b shown Figure 4aThe enlarged detail at V2 shows that the bottom of each magnet slot P includes a first groove C1. The dimension of the first groove C1 along the axial direction of motor 100 is larger than the dimension of the rotor lamination of the rotor core 1 along the axial direction of motor 100. The bottom of the first groove C1 includes multiple tongues t, which are spaced apart along the axial direction of motor 100. The circumferential dimension of each tongue t along motor 100 is smaller than the circumferential dimension of the first groove C1 along motor 100. The axial dimension of each tongue t along motor 100 is smaller than the axial dimension of the first groove C1 along motor 100. The radial dimension of each tongue t along motor 100 is larger than the radial dimension of the first groove C1 along motor 100. Each tongue t is used to abut against the surface of the magnet 2 facing the axis of motor 100. When a force is applied along the axial direction of motor 100, the tongue t will bend and deform. After bending and deforming, the tongue t will function as a spring and generate a restoring force. The cooperation structure between the first groove C1 and the tongue t can increase the degree of freedom of the tongue t when it is bent under force. On the one hand, it can reduce the resistance of the insertion of the magnet 2, and on the other hand, it can increase the reaction force generated by the bending of the tongue t.

[0071] When assembling the magnet 2 along the axial direction of the motor 100, the tongue t, which undergoes bending deformation and has a springback tendency, exerts a force on the magnet 2 to press it against the circumferential protrusion T2. ​​This generates sufficient friction between the magnet 2 and the surface of the circumferential protrusion T2 facing the axis of the motor 100, thus achieving axial positioning of the magnet 2. The rotor core 1 does not require additional structures or materials; the magnet 2 can be fixed by the rotor core 1 itself, further simplifying its structure. The shape, size, and number of the tongue t can be adaptively adjusted according to product requirements.

[0072] In one embodiment, combined with Figure 4a and Figure 4b As shown, the rotor laminations in the rotor core 1 include multiple first notches c1 and multiple radial protrusions T1. Each first notch c1 is distributed between two adjacent radial protrusions T1. The first notches c1 of two adjacent rotor laminations along the axial direction of the motor 100 are connected to form a first groove C1. At least one of the two adjacent rotor laminations also includes multiple tongues t. Each tongue t extends out of the first notch c1 in a direction away from the axis of the motor 100.

[0073] When a magnet 2 is assembled into a magnet slot P, such as Figure 4cAs shown, magnet 2 is inserted into a magnet slot P along the axial direction of motor 100. When the surface of magnet 2 facing the axis of motor 100 slides along the bottom of the slot relative to magnet slot P, the tongue t interferes with magnet 2. Magnet 2 applies a force along the axial direction of motor 100 to tongue t, causing tongue t to bend and deform along the axial direction of motor 100 to avoid magnet 2. The deformed tongue t applies a force in the opposite direction to the surface of magnet 2 facing the axis of motor 100, thereby applying a radial outward force to magnet 2. The surface of magnet 2 away from the axis of motor 100 abuts against the surface of circumferential protrusion T2 facing motor 100. Magnet 2 and circumferential protrusion T2 are pressed together. Static friction exists between magnet 2 and magnet slot P, and between magnet 2 and tongue t, thereby fixing magnet 2 and achieving axial limitation of magnet 2.

[0074] Figure 5a This application provides a structure for a row of radial protrusions T1 in a rotor core 1. For example... Figure 5a As shown, in one embodiment, a row of radial protrusions T1 includes a plurality of first radial protrusions T11 and a plurality of second radial protrusions T12, each representing a different type of radial protrusion T1. Along the radial direction of the motor 100, the size of each first radial protrusion T11 is smaller than the size of each second radial protrusion T12; along the circumferential direction of the motor 100, the size of each first radial protrusion T11 is smaller than the size of each second radial protrusion T12. Each second radial protrusion T12 includes the aforementioned two circumferential protrusions T2, and the orientations of the two circumferential protrusions T2 of each second radial protrusion T12 are opposite along the circumferential direction of the motor 100. The first radial protrusions T11 and the second radial protrusions T12 cooperate to form a row of radial protrusions T1 for limiting the magnet 2. The first radial protrusions T11 can be used to space the magnet 2, and the two circumferential protrusions T2 of the second radial protrusions T12 can be used to radially limit the magnet 2. By forming a circumferential protrusion T2 only in the structure of the second radial protrusion T12, the number of radial protrusions T1 forming the circumferential protrusion T2 can be reduced, which can simplify the structural design of the rotor core 1.

[0075] The rotor core 1 includes multiple rows of radial protrusions T, and the structure of each row of radial protrusions T is similar to... Figure 5a The structures shown are similar. Each first radial protrusion T11 has the same projected shape and size on a plane perpendicular to the axial direction of the motor 100, but the thickness of each first radial protrusion T11 along the axial direction of the motor 100 can be different. Similarly, each second radial protrusion T12 has the same projected shape and size on a plane perpendicular to the axial direction of the motor 100, but the thickness of each second radial protrusion T12 along the axial direction of the motor 100 can be different.

[0076] In one embodiment, each row of radial protrusions T1 includes at least one set of first radial protrusions T11. Each set of first radial protrusions T11 includes one first radial protrusion T11 or multiple first radial protrusions T11 arranged sequentially adjacent to each other along the axial direction of the motor 100. Each set of first radial protrusions T11 is arranged along the axial direction of the motor 100 on one side of the second radial protrusion T12. The stacking of the first radial protrusions T11 and the second radial protrusions T12 forms a magnet slot P for the insertion of the magnet 2. The first radial protrusions T11 abut against the second radial protrusions T12, providing structural support for the second radial protrusions T12 and reducing the risk of warping under stress. Figure 5a The row of radial protrusions T1 shown includes two sets of first radial protrusions T11, and at least one second radial protrusion T12 is arranged between two adjacent sets of first radial protrusions T11 along the axial direction of the motor 100. At least one second radial protrusion T12 is arranged on the side of one set of first radial protrusions T11 away from the other set of first radial protrusions T11 along the axial direction of the motor 100, and at least one second radial protrusion T12 is arranged on the side of the other set of first radial protrusions T11 away from the aforementioned set of first radial protrusions T11 along the axial direction of the motor 100.

[0077] In one embodiment, each row of radial protrusions includes multiple sets of second radial protrusions T12. Each set of second radial protrusions T12 includes one second radial protrusion T12 or multiple second radial protrusions T12 arranged sequentially adjacent to each other along the axial direction of the motor 100. The multiple sets of second radial protrusions T12 in each row of radial protrusions are arranged at intervals along the axial direction of the motor 100. Figure 5a The row of radial protrusions T1 shown includes three sets of second radial protrusions T12. A set of first radial protrusions T11 is arranged between two adjacent sets of second radial protrusions T12 along the axial direction of the motor 100. Along the axial direction of the motor 100, the two sets of second radial protrusions T12 are located at one end of the rotor core 1, and one set of second radial protrusions T12 is located in the middle of the rotor core 1.

[0078] In one embodiment, such as Figure 5b The structure of a second radial protrusion T12 shown includes a first segment T121 and a second segment T122. The distance between the first segment T121 and the axis of the motor 100 along the radial direction is less than the distance between the second segment T122 and the axis of the motor 100. The dimension w1 of the first segment T121 along the circumference of the motor 100 is less than the dimension w2 of the second segment T122. The second segment T122 can form a stepped structure with the first segment T121. When a magnet 2 is assembled into a magnet slot P, the first segment T121 is used to limit the magnet 2 along the circumference of the motor 100, and the second segment T122 can limit the magnet 2 along the radial direction of the motor 100.

[0079] In some embodiments, please continue to refer to Figure 5a As shown, the angle α between the first segment T121 and the bottom of the magnet slot P is less than or equal to 90°. The first segment T121 is used to abut against the magnet 2 along the circumference of the first rotor lamination 11. The angle α between the first segment T121 and the bottom of the magnet slot P should be adapted to the shape of the magnet 2. In specific rotor manufacturing, the structure can be designed according to needs. When the angle α between the first segment T121 and the bottom of the magnet slot P is less than 90°, the first segment T121 is inclined relative to the bottom of the magnet slot P. During rotor rotation, the magnet 2 is subjected to centripetal force and moves towards the first segment T121. The first segment T121 can apply a force to the magnet 2 along the second segment T122 pointing towards the first segment T121, thereby limiting the magnet 2 radially along the motor 100.

[0080] Figure 5c The diagram illustrates a structure in which a first radial protrusion T11 and a second radial protrusion T12 are stacked along the axial direction of the motor 100. In each second radial protrusion T12, the shape and dimensions of the first segment T121 are identical to those of the first radial protrusion T11. Two circumferential protrusions T2 of each second radial protrusion T12 are distributed within the second segment T122 of the second radial protrusion T12. When stacked, the first radial protrusion T11 provides good structural support for the second radial protrusion T12.

[0081] Further reference Figure 5d The diagram illustrates a structure where a first radial protrusion T11 and a second radial protrusion T12 are stacked and mate with a magnet 2. This example illustrates two magnets 2 adjacent to each other circumferentially along the motor 100. The first radial protrusion T11 and the second radial protrusion T12 form part of a row of radial protrusions T1. The two magnets 2 are respectively embedded in two magnet slots P on either side of this row of radial protrusions T1 along the circumferential direction of the motor 100. The two magnets 2 are separated by a first rotor lamination 11 and a second rotor lamination 12. Along the radial direction of the motor 100, the height of the first radial protrusion T11 protruding from the bottom of the magnet slot P is less than the height of the second radial protrusion T12 protruding from the bottom of the magnet slot P. An air gap N is formed between the outer circumferential surfaces of the first radial protrusion T11 and the second radial protrusion T12 away from the axis of the motor 100. This air gap N can reduce the leakage flux of the two adjacent magnets 2.

[0082] In one embodiment, along the radial direction of the motor 100, the length of the first radial protrusion T11 is about 30% of the length of the second radial protrusion T12. Alternatively, the depth of the magnet groove P between the two first radial protrusions T11 can be considered to be about 30% of the depth of the magnet groove P between the two second radial protrusions T12. This can reduce magnet leakage and improve the electromagnetic performance of the motor 100.

[0083] In one embodiment, the rotor laminations of the rotor core 1 include multiple... Figure 6a The first rotor lamination 11 and multiple... Figure 6b The second rotor lamination 12 shown is a type of rotor lamination, with each first rotor lamination 11 and each second rotor lamination 12 being a different type of rotor lamination. Figure 6c An example is shown of a structure in which a first rotor lamination 11 and a second rotor lamination 12 are stacked, which is part of the rotor core 1.

[0084] Refer to together Figures 6a to 6c As shown, each first rotor lamination 11 includes multiple first radial protrusions T11, which are sequentially spaced along the circumference of the first rotor lamination 11. Each second rotor lamination 12 includes multiple second radial protrusions T12, which are sequentially spaced along the circumference of the second rotor lamination 12. The number of first rotor laminations 11 is greater than the number of second rotor laminations 12. The greater number of first rotor laminations 11 can provide structural support for the second rotor laminations 12 and can reduce the leakage flux of the entire rotor 10, thereby improving the electromagnetic performance of the motor 100. The rotor core 1 is formed by stacking multiple laminations. Different laminations among these multiple laminations have different structural designs, and when stacked adjacently, they can form magnet slots P for mounting and fixing multiple magnets 2. Each lamination can be formed from a silicon steel sheet through a one-piece forming process such as stamping and shearing. After the magnet 2 is assembled into the rotor core 1, the rotation of the rotor 10 when the motor 100 is working can ensure that the magnet 2 will not be thrown out, which can improve the structural stability of the rotor core 1.

[0085] like Figure 6a As shown, a first groove p1 is formed between any two adjacent first radial protrusions T11 of the first rotor lamination 11, and each first groove p1 is used to form part of a magnetic slot P of the rotor core 1. In one embodiment, the first rotor lamination 11 is annular and includes a first central hole q1 that extends through the first rotor lamination 11 along its axial direction. In another embodiment, the first rotor lamination 11 includes a plurality of first grooves p1 with the same shape and specifications, and the plurality of first grooves p1 are arranged in a ring array around the first central hole q1.

[0086] Figure 6bAs shown, a second groove p2 is formed between any two adjacent second radial protrusions T12 of the second rotor lamination 12, and each second groove p2 is used to form part of a magnetic slot P of the rotor core 1. In one embodiment, the second rotor lamination 12 is annular and includes a second central hole q2 that extends through the second rotor lamination 12 along its axial direction. In another embodiment, the first rotor lamination 11 includes a plurality of first grooves p1 with the same shape and specifications, and the plurality of first grooves p1 are arranged in a ring array around the first central hole q1.

[0087] Refer to together Figures 6a to 6c As shown, after a first rotor lamination 11 and a second rotor lamination 12 are stacked, a first slot p1 and a second slot p2 are connected along the axial direction of the motor 100 to form part of a magnet slot P. A first radial protrusion T11 on the first rotor lamination 11 can abut against a second radial protrusion T12 on the second rotor lamination 12, providing structural support for the second rotor lamination 12. When the magnet 2 is embedded in a magnet slot P along the axial direction of the motor 100, the support of the first rotor lamination 11 on the second rotor lamination 12 reduces the risk of warping of the second radial protrusion T12 of the second rotor lamination 12 under stress.

[0088] In one embodiment, such as Figure 6a and Figure 6b As shown, the rotor laminations of the rotor core 1 include a plurality of first notches c1. Each first notch c1 in each first rotor lamination 11 is distributed between two adjacent first radial protrusions T11, and each first notch in each first rotor lamination 11 is distributed between two adjacent second radial protrusions T11. Each second rotor lamination 12 also includes a plurality of tongues t, each tongue t extending out of the first notch c1 of the second rotor lamination 12 in a direction opposite to the axis of the motor 100.

[0089] Combination Figure 6c As shown, along the axial direction of the motor 100, a first rotor lamination 11 and a second rotor lamination 12 are stacked. Each first radial protrusion T11 on the first rotor lamination 11 is stacked with a second radial protrusion T12 on the second rotor lamination 12. The space between any two adjacent first radial protrusions T11 on the first rotor lamination 11 and the space between two adjacent second radial protrusions T12 on the second rotor lamination 12 are connected to form part of a magnetic slot P. Taking the insertion of a magnet 2 into a magnetic slot P as an example, when the magnet 2 is inserted into the magnetic slot P along the axial direction of the motor 100, the magnet 2 applies a force along the axial direction of the motor 100 to the protrusion t, causing the protrusion t to bend. The deformed protrusion t protrudes from the second rotor lamination 12 along the axial direction of the motor 100, and the first notch c1 of the first rotor lamination 11 can be used to accommodate the protrusion t.

[0090] In one embodiment, the rotor core 1 includes a plurality of first rotor laminations 11 and a plurality of second rotor laminations 12. The plurality of first rotor laminations 11 are arranged sequentially adjacent to each other on one side of a second rotor lamination 12. The tilting direction of each tongue t of the second rotor lamination 12, which is pressed by the magnet 2, is along the axial direction of the motor 100 toward the first notch c1 of the first rotor lamination 11. When assembling the magnet 2, the portion of the tongue t bent by the magnet 2 that protrudes from the axial end face of the second rotor lamination 12 can enter the first notch c1 of the first rotor lamination 11, thereby achieving structural avoidance.

[0091] Based on the rotor core 1 of the motor 100 provided in the above embodiment, compared with the traditional surface-mounted rotor design, this structure can reduce the need for the injection-molded body and steel sleeve used to fix the magnet 2, reduce the structure and cost of the rotor 10, and improve assembly difficulty. This design can also reduce the radial dimension of the rotor 10. For the motor 100, with a rotor 10 having a smaller radial dimension, the stator 20 can reserve a smaller air gap space to accommodate the rotor 10, which can improve the power density and electromagnetic performance of the motor 100.

[0092] like Figure 7a As shown, this application also provides another rotor 10, Figure 7b This is an exploded view of the rotor core 1 of the rotor 10 separated from the multiple magnets 2. Figure 7b As shown, the rotor core 1 includes multiple rotor laminations. These laminations are stacked along the axial direction of the motor 100 to form the rotor core 1. Each rotor lamination includes a central hole q that extends through the rotor lamination along the axial direction of the motor 100, and the central hole q is coaxial with the axis of the rotor lamination. The multiple rotor laminations stacked along the axial direction of the motor 100 constitute the rotor core 1, and the central holes q of the multiple rotor laminations can communicate along the axial direction of the motor 100 to form a shaft hole Q. A row of radial protrusions T1 is indicated by a dashed box.

[0093] In one embodiment, such as Figure 7c shown Figure 7b The enlarged detail at V3 shows that the bottom of each magnet slot P includes a second groove C2. The dimension of the second groove C2 along the axial direction of the motor 100 is larger than the dimension of the rotor lamination of the rotor core 1 along the axial direction of the motor 100. The opening of the second groove C2 faces away from the axis of the motor 100 along the radial direction. The depth of the second groove C2 is less than its width, which ensures the structural reliability of the rotor core 1. The second groove C2 is used to accommodate adhesive material, which is used to bond the bottom of the magnet slot P and the magnet 2.

[0094] Figure 7cIn the motor 100, along the circumference of the motor, each magnet slot P has two second grooves C2 spaced apart at its bottom. These grooves create two bonding points between the magnet 2 and the bottom of the magnet slot P, improving the bonding strength and the balance of structural stress. Of course, the number of second grooves C2 can be three, four, or even more as needed. The second grooves C2 spaced apart at the bottom of each magnet slot P are axially symmetrically distributed, creating uniform bonding points between the magnet 2 and the bottom of the magnet slot P, improving the balance of stress on the magnet 2 along the circumference of the motor 100. When each magnet slot P has one second groove C2 spaced apart at its bottom, this second groove C2 is axially symmetrical along the circumference of the motor 100. When each magnet slot P has an even number of second grooves C2 spaced apart at its bottom, these even number of second grooves C2 are axially symmetrical along the circumference of the motor 100. When an odd number of second grooves C2 are arranged at intervals on the bottom of each magnet slot P, the odd number of second grooves C2 are axially symmetrically distributed along the circumference of the motor 100.

[0095] In one embodiment, combined with Figure 7b and Figure 7c As shown, each rotor lamination in the rotor core 1 includes multiple second notches c2 and multiple radial protrusions T1. Each second notch c2 of the rotor lamination is distributed between two adjacent radial protrusions T1. Along the axial direction of the motor, each second notch c2 of each rotor lamination sequentially connects to another second notch c2 of an adjacent rotor lamination to form a second groove C2. The width of the second notch c2 is greater than the depth of the second notch c2 to provide sufficient space to accommodate adhesive materials while ensuring the structural strength of the rotor lamination.

[0096] In one embodiment, the two second notches c2 that connect two adjacent rotor laminations can have different or the same shape, as long as they can connect to allow the flow of adhesive material.

[0097] When a magnet 2 is assembled into a magnet slot P, such as Figure 7d As shown, when the surface of magnet 2 facing the axis of motor 100 slides along the bottom of the magnetic slot P, the surface of magnet 2 facing the axis of motor 100 is opposite to the bottom of magnetic slot P. The two sides of magnet 2 along the circumference of motor 100 contact the radial protrusions T on both sides of magnetic slot P. Magnetic slot P can limit the movement of magnet 2 radially and circumferentially along the first rotor lamination 11. There is a gap between the second groove C2 of magnetic slot P and the surface of magnet 2 facing the axis of motor 100. An adhesive material 40 is filled into the second groove C2, which fixes magnet 2 to magnetic slot P, thus achieving axial limiting of magnet 2.

[0098] In one embodiment, please continue to refer to Figure 7dAs shown, along the radial direction of the motor 100, the surface of the magnet 2 facing away from the bottom of the magnet slot P is arc-shaped and protrudes in a direction away from the magnet slot P. The surface of the magnet 2 facing away from the bottom of the magnet slot P has a farthest point M along the radial direction of the motor 100, which is farthest from the axis of the motor 100. Along the radial direction of the motor 100, the magnet 2 has the maximum thickness at this farthest point M. The maximum thickness of the magnet 2 is less than or equal to the depth of the magnet slot P, which avoids the magnet 2 protruding from the outer circumference of the rotor core 1 and helps to reduce the radial dimension of the rotor 10.

[0099] Figure 8 This application provides a structure for a row of radial protrusions T1 in a rotor core 1. For example... Figure 8 As shown, in one embodiment, a row of radial protrusions T1 includes multiple first radial protrusions T11 and multiple second radial protrusions T12, where the first radial protrusions T11 and the second radial protrusions T12 are two types of radial protrusions T1. Along the radial direction of the motor 100, the size of each first radial protrusion T11 is smaller than the size of each second radial protrusion T12; along the circumferential direction of the motor 100, the size of each first radial protrusion T11 is smaller than the size of each second radial protrusion T12. Each second radial protrusion T12 includes the aforementioned two circumferential protrusions T2, and the orientations of the two circumferential protrusions T2 of each second radial protrusion T12 are opposite along the circumferential direction of the motor 100. The rotor core 1 includes multiple rows of radial protrusions T, and the structure of each row of radial protrusions T is similar to... Figure 8 The structures shown are similar.

[0100] In one embodiment, each row of radial protrusions T1 includes at least one set of first radial protrusions T11, and each set of first radial protrusions T11 includes one first radial protrusion T11 or a plurality of first radial protrusions T11 arranged sequentially adjacent to each other along the axial direction of the motor 100. Each set of first radial protrusions T11 is arranged along the axial direction of the motor 100 on one side of the second radial protrusion T12. Figure 8 The row of radial protrusions T1 shown includes a set of first radial protrusions T11, and at least one second radial protrusion T12 is arranged at each end of the set of first radial protrusions T11 along the axial direction of the motor 100.

[0101] In one embodiment, each row of radial protrusions includes multiple sets of second radial protrusions T12. Each set of second radial protrusions T12 includes one second radial protrusion T12 or multiple second radial protrusions T12 arranged sequentially adjacent to each other along the axial direction of the motor 100. The multiple sets of second radial protrusions T12 in each row of radial protrusions are arranged at intervals along the axial direction of the motor 100. Figure 8The row of radial protrusions T1 shown includes two sets of second radial protrusions T12. A set of first radial protrusions T11 is arranged between two adjacent sets of second radial protrusions T12 along the axial direction of the motor 100. Along the axial direction of the motor 100, the two sets of second radial protrusions T12 are respectively located at one end of the rotor core 1 along the axial direction.

[0102] In one embodiment, the rotor core 1 includes a plurality of rotor laminations, which are stacked along the axial direction of the motor 100 to form the rotor core 1. The rotor laminations of the rotor core 1 include a plurality of sets of second notches c2, each set of notches c2 being distributed along the circumference of the motor 100 between two adjacent rows of radial protrusions T.

[0103] The rotor laminations of rotor core 1 include multiple Figure 9a The first rotor lamination 11 and multiple... Figure 10a The second rotor lamination 12 shown is a type of rotor lamination, with each first rotor lamination 11 and each second rotor lamination 12 being a different type of rotor lamination. Figure 11a An example is shown of a structure in which a first rotor lamination 11 and a second rotor lamination 12 are stacked, which is part of the rotor core 1. Figure 9b for Figure 9a A magnified view of the details at V4. Figure 10b for Figure 10a A magnified view of the details at V5. Figure 11b for Figure 11a A magnified view of the details at V6.

[0104] like Figure 9a and Figure 9b as well as Figure 10a and Figure 10b As shown, each first rotor lamination 11 includes a plurality of first radial protrusions T11, which are sequentially spaced along the circumference of the first rotor lamination 11. Each second rotor lamination 12 includes a plurality of second radial protrusions T12, which are sequentially spaced along the circumference of the second rotor lamination 12. A first groove p1 is formed between any two adjacent first radial protrusions T11 of the first rotor lamination 11, and each first groove p1 is used to form part of a magnetic slot P of the rotor core 1. A second groove p2 is formed between any two adjacent second radial protrusions T12 of the second rotor lamination 12, and each second groove p2 is used to form part of a magnetic slot P of the rotor core 1.

[0105] Each set of second notches c2 in the first rotor lamination 11 is distributed between two adjacent first radial protrusions T11, and each set of second notches c2 in the second rotor lamination 12 is distributed between two adjacent second radial protrusions T12. Each set of second notches c2 includes two second notches c2, and the width of the second notch c2 is greater than the depth of the second notch c2. Figure 9b The two second gaps c2 between any two adjacent first radial protrusions T11 constitute a set of second gaps c2. Figure 10b Two second notches c2 between any two adjacent second radial protrusions T12 constitute a group of second notches c2. In each first rotor lamination 11, the interval between two second notches c2 in each group of second notches c2 is less than the interval between each second notch c2 and the first radial protrusion T11, and in each second rotor lamination 12, the interval between two second notches c2 in each group of second notches c2 is less than the interval between each second notch c2 and the second radial protrusion T12.

[0106] Combination Figure 11a and Figure 11b As shown, after a first rotor lamination 11 and a second rotor lamination 12 are stacked, each first slot p1 and each second slot p2 are connected along the axial direction of the motor 100 to form part of a magnet slot P. Each second notch c2 of the first rotor lamination 11 is connected to a second notch c2 of the second rotor lamination 12 to form part of a second groove C. A first radial protrusion T11 on the first rotor lamination 11 can abut against a second radial protrusion T12 on the second rotor lamination 12, and the first rotor lamination 11 can provide certain structural support for the second rotor lamination 12. When the magnet 2 is embedded in a magnet slot P along the axial direction of the motor 100, the support of the first rotor lamination 11 for the second rotor lamination 12 can reduce the risk of warping of the second radial protrusion T12 of the second rotor lamination 12 under stress.

[0107] It should be understood that the embodiments of this application provide two different rotor cores 1. The number and arrangement of the first rotor laminations 11 and the second rotor laminations 12 of the two rotor cores 1 are different. In actual production, the number and arrangement of the first rotor laminations 11 and the second rotor laminations 12 can be adjusted according to the load requirements of the motor 100.

[0108] In one embodiment, the rotor 10 provided in this application includes two... Figure 4a The rotor core shown is 1 or two Figure 7b The rotor core 1 is shown. The two rotor cores 1 are arranged adjacent to each other along the axial direction of the rotor 10 and are coaxial. The two rotor cores 1 are misaligned along the circumferential direction of the rotor 10, which can reduce the operating vibration and electromagnetic noise of the motor 100, thereby improving the performance of the motor 100.

[0109] In summary, the rotor core 1 provided in this application embodiment fixes the magnet 2 through the cooperation of the first rotor lamination 11 and the second rotor lamination 12. That is, the magnet 2 is fixed by the structure of the rotor core 1 itself, replacing the traditional fixing structure of injection molded body and steel sleeve. This can save the material cost of injection molded body and steel sleeve and the corresponding equipment investment, reducing the manufacturing cost of rotor 10. During the assembly of rotor core 1, it is only necessary to insert the magnet 2 into the magnet slot P of rotor core 1 along the axial direction of motor 100, and fix the magnet 2 by adhesive or spring pressing with tongue t, which can simplify the assembly process of rotor core 1. For rotor 10 including rotor core 1, there is no need to reserve space for injection molding at the end of rotor 10, which can save axial assembly space of motor 100. With the rotor core 1 itself fixing the magnet 2, when rotor 10 and stator 20 form motor 100, the air gap between rotor 10 and stator 20 can be further reduced, thereby improving the electromagnetic performance and power density of motor 100. The drive-by-wire device 100 of the electric vehicle uses this motor 100, which occupies less space and can have better performance in terms of power.

[0110] The above are merely specific embodiments of this application, but the scope of protection of this application 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 application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An electric motor, characterized in that, The motor includes a rotor and a stator. The stator generates a magnetic field to drive the rotor to rotate. The rotor includes a rotor core and multiple magnets. The rotor core is used to fix the multiple magnets, wherein: The rotor core includes multiple rows of radial protrusions, each row of radial protrusions is arranged along the axial direction of the motor, and the orientation of each row of radial protrusions is away from the axis of the motor along the radial direction of the motor. The multiple rows of radial protrusions are distributed at intervals along the circumference of the motor. The gap between two adjacent rows of radial protrusions serves as a magnetic groove. Each magnetic groove is used to accommodate one magnet. Each row of radial protrusions includes multiple circumferential protrusions on both sides. Each circumferential protrusion faces the adjacent row of radial protrusions along the circumference of the motor. Each circumferential protrusion is used to abut against the surface of the magnet away from the bottom of the magnetic groove.

2. The motor as described in claim 1, characterized in that, The bottom of each magnet slot includes a first groove, the dimension of which along the motor axial direction is larger than the dimension of the rotor lamination of the rotor core along the motor axial direction. The bottom of the first groove includes a plurality of tongues, the plurality of tongues being spaced apart along the motor axial direction. The dimension of each tongue along the motor circumferential direction is smaller than the dimension of the first groove along the motor circumferential direction. The dimension of each tongue along the motor axial direction is smaller than the dimension of the first groove along the motor axial direction. The dimension of each tongue along the motor radial direction is larger than the dimension of the first groove along the motor radial direction. Each tongue is used to abut against the surface of the magnet facing the motor axis.

3. The motor as described in claim 2, characterized in that, Each rotor lamination in the rotor core includes a plurality of first notches and a plurality of radial protrusions. Each first notch is distributed between two adjacent radial protrusions. The first notches of two adjacent rotor laminations along the motor axis are connected to form the first groove. At least one of the two adjacent rotor laminations also includes a plurality of tongues. Each tongue extends out of the first notch in a direction away from the motor axis.

4. The motor as described in claim 1, characterized in that, The bottom of each of the magnet slots includes a second groove, the dimension of each second groove along the motor axis being greater than the dimension of the rotor lamination of the rotor core along the motor axis, the opening of the second groove facing away from the motor axis along the radial direction of the motor, the depth of the second groove being less than the width of the second groove, and the second groove being used to accommodate an adhesive material for bonding the bottom of the magnet slot and the magnet.

5. The motor as described in claim 4, characterized in that, Each rotor lamination in the rotor core includes a plurality of second notches and a plurality of radial protrusions. Each second notch of the rotor lamination is distributed between two adjacent radial protrusions. The width of the second notch is greater than the depth of the second notch. Along the axial direction of the motor, each second notch of each rotor lamination sequentially connects to another second notch of an adjacent rotor lamination to form a second groove.

6. The motor as described in any one of claims 1-5, characterized in that, Each row of radial protrusions includes a plurality of first radial protrusions and a plurality of second radial protrusions. The size of each first radial protrusion is smaller than the size of each second radial protrusion along the radial direction of the motor, and the size of each first radial protrusion is smaller than the size of each second radial protrusion along the circumference of the motor. Each second radial protrusion includes two circumferential protrusions, and the orientations of the two circumferential protrusions of each second radial protrusion are opposite along the circumference of the motor.

7. The motor as described in claim 6, characterized in that, Each of the second radial protrusions includes a first segment and a second segment, wherein the distance between the first segment and the motor axis along the radial direction of the motor is less than the distance between the second segment and the motor axis, wherein: The size of the first segment along the circumference of the motor is smaller than the size of the second segment. The shape and size of the first segment in each second radial protrusion are the same as the shape and size of the first radial protrusion. The two circumferential protrusions of each second radial protrusion are distributed in the second segment of the second radial protrusion.

8. The motor as described in claim 7, characterized in that, The rotor laminations of the rotor core include a plurality of first rotor laminations and a plurality of second rotor laminations, wherein the number of first rotor laminations is greater than the number of second rotor laminations, and wherein: Each of the first rotor laminations includes a plurality of first radial protrusions, and the plurality of first radial protrusions of each of the first rotor laminations are distributed sequentially at intervals along the circumference of the first rotor lamination. Each of the second rotor laminations includes a plurality of second radial protrusions, the plurality of second radial protrusions of each of the second rotor laminations being distributed sequentially at intervals along the circumference of the second rotor lamination.

9. The motor as described in claim 8, characterized in that, The rotor laminations of the rotor core include a plurality of first notches, each first notch in each first rotor lamination is distributed between two adjacent first radial protrusions, and each first notch in each first rotor lamination is distributed between two adjacent second radial protrusions, wherein: Each of the second rotor laminations further includes a plurality of tongues, each of the tongues extending out of the first notch of the second rotor lamination in a direction opposite to the axis of the motor.

10. The motor as described in claim 9, characterized in that, Multiple first rotor laminations are arranged sequentially adjacent to each other on one side of a second rotor lamination, and the inclination direction of each tongue of the second rotor lamination is along the axial direction of the motor toward the first notch of the first rotor lamination.

11. The motor as described in claim 8, characterized in that, The rotor laminations of the rotor core include multiple sets of second notches. Each set of second notches in each first rotor lamination is distributed between two adjacent first radial protrusions, and each set of second notches in each second rotor lamination is distributed between two adjacent second radial protrusions, wherein: Each group of second notches includes two second notches, the width of the second notches is greater than the depth of the second notches, the interval between the two second notches in each group of second notches in each first rotor lamination is less than the interval between each second notch and the first radial protrusion, and the interval between the two second notches in each group of second notches in each second rotor lamination is less than the interval between each second notch and the second radial protrusion.

12. The motor as described in claim 6, characterized in that, Each row of radial protrusions includes at least one set of the first radial protrusions. Each set of the first radial protrusions includes one first radial protrusion or a plurality of first radial protrusions arranged sequentially adjacent to each other along the axial direction of the motor. Each set of the first radial protrusions is arranged on one side of the second radial protrusion along the axial direction of the motor.

13. The motor as described in claim 12, characterized in that, Each row of radial protrusions includes multiple sets of second radial protrusions. Each set of second radial protrusions includes one second radial protrusion or multiple second radial protrusions arranged sequentially adjacent to each other along the axial direction of the motor. The multiple sets of second radial protrusions in each row of radial protrusions are arranged at intervals along the axial direction of the motor.

14. A wired control device, characterized in that, The drive-by-wire device includes a motor controller and a motor as described in any one of claims 1-13, wherein the motor controller is used to control the motor to provide power to at least one of the braking device, steering device, or suspension device of the electric vehicle.

15. An electric vehicle, characterized in that, The electric vehicle includes a braking device, a steering device, a suspension device, and a drive-by-wire device as described in claim 14, the drive-by-wire device being used to provide power to at least one of the braking device, the steering device, or the suspension device.

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