Rotor assembly, motor and vehicle

Abstract

The utility model belongs to the technical field of motors, and particularly relates to a rotor assembly, a motor and a vehicle. The rotor assembly comprises a support, a plurality of magnets and a rotor iron core, the rotor iron core is connected with the support, a plurality of magnet grooves are formed in the rotor iron core, the magnet grooves are arranged at intervals in the circumferential direction of the rotor iron core, the magnets are connected with the rotor iron core, and the magnets are embedded into the magnet grooves respectively. The plurality of magnet grooves are divided into a plurality of magnet groove groups, the plurality of magnet groove groups are arranged at intervals along the circumferential direction of the rotor iron core, each magnet groove group comprises a plurality of magnet grooves, and the plurality of magnet grooves in each magnet groove group are arranged at intervals along the radial direction of the rotor iron core. The rotor assembly can reduce the restriction influence of the centrifugal force of the magnetic steel on the rotating speed of the rotor, and improves the rotating speed of the rotor.

Description

Technical Field

[0001] The present disclosure belongs to the technical field of motors, and in particular relates to a rotor assembly, a motor and a vehicle. Background Art

[0002] Compared with radial flux motors, axial flux motors have the advantages of high torque density, small axial size, and light weight. In the application of new energy vehicle main drive motors, axial flux motors have a larger rotor outer diameter, a higher rotor outer diameter linear speed under the same speed and torque requirements, and a higher rotor high-speed strength risk.

[0003] In the related art, the magnet and the iron core in the axial flux motor are mostly connected by bolts or bonding. When the rotor rotates, the magnet and the entire rotor are subjected to a large centrifugal force, which restricts the increase in the rotor speed. Utility Model Content

[0004] The present disclosure aims to solve one of the technical problems in the related art at least to a certain extent. To this end, an embodiment of the present disclosure provides a rotor assembly that can reduce the restrictive effect of the centrifugal force of the magnetic steel on the rotor speed and increase the rotor speed.

[0005] An embodiment of the present disclosure also provides a motor.

[0006] An embodiment of the present disclosure also provides a vehicle.

[0007] The rotor assembly of the embodiment of the present disclosure includes: a bracket; a rotor core, the rotor core is connected to the bracket, a plurality of magnet slots are provided on the rotor core, and the plurality of magnet slots are arranged at intervals along the circumference of the rotor core; a plurality of magnets, the magnets are connected to the rotor core, and the plurality of magnets are respectively embedded in the plurality of magnet slots, the plurality of magnet slots are divided into a plurality of magnet slot groups, the plurality of magnet slot groups are arranged at intervals along the circumference of the rotor core, the magnet slot groups include a plurality of magnet slots, and the plurality of magnet slots in each magnet slot group are arranged at intervals along the radial direction of the rotor core.

[0008] The rotor assembly of the embodiment of the present disclosure can reduce the restrictive effect of the centrifugal force of the magnetic steel on the rotor speed and increase the rotor speed.

[0009] In some embodiments, the magnet slots have the same radial dimensions of the rotor, or the radial dimensions of the multiple magnet slots in at least one of the multiple magnet slot groups gradually decrease in a direction away from the axis of the rotor core.

[0010] In some embodiments, the size of the multiple magnet slots in at least one of the multiple magnet slot groups in the circumferential direction of the rotor core gradually increases in a direction away from the axis of the rotor core.

[0011] In some embodiments, two adjacent magnet slots in at least one magnet slot group among the plurality of magnet slot groups are staggered in sequence along the same direction in the circumferential direction of the rotor core.

[0012] In some embodiments, two adjacent magnet slots in at least one magnet slot group among the plurality of magnet slot groups are staggered at a preset angle in the circumferential direction of the rotor core.

[0013] In some embodiments, the rotor core includes a multi-layer wound core sheet, and a plurality of first grooves arranged at intervals are provided on the core sheet, and the plurality of first grooves surround the magnet slot.

[0014] In some embodiments, a magnetic bridge is provided between two adjacent magnet slots in each group of magnet slots.

[0015] In some embodiments, there is a magnetic isolation groove between two adjacent magnet grooves, and the magnetic isolation groove corresponds to the position of the magnetic bridge. The iron core sheet also has a plurality of second grooves, and the plurality of second grooves surround the magnetic isolation groove.

[0016] In some embodiments, an elastic member is provided on the rotor core, the elastic member is located at the opening of the magnet slot, and the elastic member is suitable for abutting against the magnet to fix the magnet in the magnet slot.

[0017] In some embodiments, the rotor core has a plurality of welding grooves, and the welding grooves are located on a side of the rotor core away from the air gap, the welding grooves extend radially along the rotor core, and the plurality of welding grooves are spaced apart along the circumference of the rotor core.

[0018] In some embodiments, the number of the welding slots is K, and K=mp, where p=1 or 2, and m is the number of magnet slot groups.

[0019] In some embodiments, the rotor assembly further includes a rotor sleeve surrounding the exterior of the rotor core.

[0020] The motor of the disclosed embodiment includes: a stator and a rotating shaft, wherein the stator is sleeved on the rotating shaft; a rotor, wherein the rotor is a rotor assembly as described in any one of the above, wherein the rotor is sleeved on the rotating shaft, and the bracket is connected to the rotating shaft, and the rotor and the stator are spaced apart in the axial direction of the rotating shaft and an air gap is formed therebetween.

[0021] The motor of the embodiment of the present disclosure adopts the above-mentioned rotor assembly, which can reduce the restrictive effect of the centrifugal force of the magnetic steel on the rotor speed and increase the rotor speed.

[0022] In some embodiments, two adjacent magnet slots are staggered at a preset angle in the circumferential direction of the rotor core, the preset angle is A, and A≤360 / (s1*(n-1)), where s1 is the number of stator slots, and n is the number of magnet slots in the magnet slot group.

[0023] The vehicle of the embodiment of the present disclosure includes the motor as described above or the rotor assembly as described above.

[0024] The vehicle of the embodiment of the present disclosure adopts the above-mentioned rotor assembly, which can reduce the restrictive effect of the centrifugal force of the magnetic steel on the rotor speed and increase the rotor speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of a rotor core according to an embodiment of the present disclosure.

[0026] Figure 2 Schematic diagram of a rotor core according to an embodiment of the present disclosure.

[0027] Figure 3 Schematic diagram of a rotor core according to an embodiment of the present disclosure.

[0028] Figure 4 It is a schematic diagram of the staggered arrangement of adjacent magnet slots in an embodiment of the present disclosure.

[0029] Figure 5 Schematic diagram of an iron core sheet according to an embodiment of the present disclosure.

[0030] Figure 6 Schematic diagram of an elastic member according to an embodiment of the present disclosure.

[0031] Figure 7 Schematic diagram of a magnetic isolation groove according to an embodiment of the present disclosure.

[0032] Figure 8 Schematic diagram of a rotor welding slot according to an embodiment of the present disclosure.

[0033] Fig. 9 is a schematic diagram of a rotor assembly according to an embodiment of the present disclosure.

[0034] Fig.10 is a schematic diagram of a motor according to an embodiment of the present disclosure.

[0035] Reference numerals:

[0036] Rotor assembly 10, stator 20, shaft 30,

[0037] Rotor core 1, magnet slot 11, magnet slot group 12, core piece 13, first groove 131, second groove 132, magnetic bridge 14, magnetic isolation groove 15, elastic member 16, welding groove 17,

[0038] Magnet 2, rotor sleeve 3, bracket 4. DETAILED DESCRIPTION

[0039] Embodiments of the present disclosure are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present disclosure, but should not be understood as limiting the present disclosure.

[0040] The rotor assembly 10 of the embodiment of the present disclosure includes a bracket 4, a rotor core 1 and a plurality of magnets 2. The rotor core 1 is connected to the bracket 4. The rotor core 1 is provided with a plurality of magnet slots 11. The plurality of magnet slots 11 are arranged at intervals along the circumference of the rotor core 1.

[0041] The magnet 2 is connected to the rotor core 1 , and a plurality of magnets 2 are respectively embedded in a plurality of magnet slots 11 .

[0042] Specifically, Figure 1 As shown, the front end of the bracket 4 is connected to the rear end of the rotor core 1, and a plurality of magnet slots 11 are provided on the front end surface of the rotor core 1. The plurality of magnet slots 11 are arranged at intervals in the circumferential direction of the rotor core 1, and a plurality of magnets 2 are respectively embedded in the plurality of magnet slots 11. For example, one magnet 2 is arranged in one magnet slot 11 to fix the magnet 2, and the plurality of magnets 2 are respectively fixed to the rotor core 1. The shape of the magnet slot 11 can be rectangular, or the shape of the magnet slot 11 can be other existing shapes, for example, the shape of the magnet slot 11 is trapezoidal, and different magnet slots 11 can be manufactured according to different magnet designs to meet different usage requirements.

[0043] Furthermore, structural adhesive is arranged between the magnet 2 and the inner wall surface of the magnet slot 11 to fix the magnet 2 in the magnet slot 11 and improve the structural strength of the connection between the magnet 2 and the rotor core 1 .

[0044] Furthermore, the magnet 2 and the magnet slot 11 are fixed to the rotor core 1 by using an existing mortise and tenon structure, thereby improving the stability and safety of the connection between the magnet 2 and the rotor core 1 .

[0045] The rotor assembly 10 of the embodiment of the present disclosure is provided with magnet slots 11 arranged at intervals in the circumferential direction of the rotor core 1, and multiple magnets 2 are respectively installed in the magnet slots 11, so that the magnets 2 and the rotor core 1 do not need to be connected to each other by bolts or bonding. When the magnets 2 and the rotor core 1 are connected by bolts or bonding, the centrifugal force on the rotor during rotation is relatively large, and the connection strength between the magnets 2 and the rotor determines the upper limit of the rotation speed, thereby restricting the increase in the rotor speed. The rotor assembly 10 of the embodiment of the present disclosure can reduce the restrictive effect of the centrifugal force of the magnetic steel on the rotor speed and increase the rotor speed by arranging the magnets 2 in the magnet slots 11.

[0046] In some embodiments, the multiple magnet slots 11 are divided into multiple magnet slot groups 12, the multiple magnet slot groups 12 are arranged at intervals along the circumferential direction of the rotor core 1, the magnet slot groups 12 include multiple magnet slots 11, and the multiple magnet slots 11 in each magnet slot group 12 are arranged at intervals along the radial direction of the rotor core 1.

[0047] Specifically, Figure 1 and Figure 2 As shown, a plurality of magnet slot groups 12 are arranged at intervals in the circumferential direction of the rotor core 1, so as to facilitate the arrangement of a plurality of magnets 2 at intervals in the circumferential direction of the rotor core 1.

[0048] Furthermore, at least two of the multiple magnet slot groups 12 are mirror-symmetrical along the radial direction of the rotor core 1, for example, two non-adjacent magnet slot groups 12 are mirror-symmetrical along at least one radial direction of the rotor core 1, thereby avoiding torque pulsation when the rotor rotates. The magnet slots 11 in a single magnet slot group 12 of the magnet slot group are arranged at intervals in the radial direction of the rotor, for example, in a single magnet slot group 12, multiple magnet slots 11 are arranged at intervals in the radial direction of the rotor core 1, thereby more magnets 2 can be installed, thereby improving the torque density and power density of the rotor.

[0049] The rotor assembly 10 of the embodiment of the present disclosure arranges multiple magnet slot groups 12 at intervals in the circumferential direction of the rotor core 1, and a single magnet slot group 12 arranges multiple magnet slots 11 radially arranged along the rotor core 1, so that more magnets 2 can be installed, thereby improving the torque density and power density of the rotor.

[0050] In some embodiments, the size of the multiple magnet slots 11 in at least one magnet slot group 12 among the multiple magnet slot groups 12 in the radial direction of the rotor core 1 gradually decreases in a direction away from the axis of the rotor core 1 .

[0051] Specifically, such as Figure 1 and Figure 2 As shown, the radial dimensions of the multiple magnet slots 11 within a single magnet slot group 12 gradually decrease in the direction away from the rotor core 1 to reduce the volume of the outermost magnet slots 11, thereby reducing the weight of the magnets 2 installed in the outermost magnet slots 11, thereby reducing the centrifugal force of the outermost magnet 2, and further increasing the rotation speed of the rotor.

[0052] Alternatively, the radial dimensions of the multiple magnet slots 11 in at least two magnet slot groups 12 among the multiple magnet slot groups 12 gradually decrease in the direction away from the axis of the rotor core 1, and the two magnet slot groups 12 are arranged in a mirror-symmetrical manner along at least one straight line in the radial direction of the rotor core 1, thereby reducing the torque pulsation during the rotation of the rotor, that is, reducing the torque fluctuation during the rotation of the rotor core 1, reducing the energy consumption of the rotor core 1 during rotation, and improving the stability of the rotor during rotation.

[0053] Furthermore, multiple magnet slot groups 12 are arranged in a mirror-symmetrical manner along at least one straight line in the radial direction of the rotor core 1, and the magnet slot groups 12 on the rotor core 1 are arranged radially symmetrically on the rotor core 1, so that the weight of the rotor core 1 after the magnets 2 are installed is more uniform, and the radial dimensions of the multiple magnet slots 11 in each magnet slot group 12 in the multiple magnet slot groups 12 gradually decrease in the direction away from the axis of the rotor core 1, thereby reducing the volume of the outermost magnet slots 11, thereby reducing the weight of the magnets 2 installed in the outermost magnet slots 11, reducing the centrifugal force of the outermost magnets 2, further increasing the rotation speed of the rotor, and avoiding torque pulsation during the rotation of the rotor, that is, avoiding the torque of the rotor core 1 from being large or small during rotation, reducing the energy consumption of the rotor core 1 during rotation, and improving the stability of the rotor during rotation.

[0054] The rotor assembly 10 of the embodiment of the present disclosure gradually reduces the radial dimensions of the multiple magnet slots 11 in at least one magnet slot group 12 among the multiple magnet slot groups 12 in the direction away from the axis of the rotor core 1, thereby reducing the volume of the outermost magnet slots 11, and further reducing the weight of the magnets 2 installed in the outermost magnet slots 11, reducing the centrifugal force of the outermost magnets 2, and further increasing the rotation speed of the rotor.

[0055] In some embodiments, the size of the multiple magnet slots 11 in at least one magnet slot group 12 among the multiple magnet slot groups 12 in the circumferential direction of the rotor core 1 gradually increases in a direction away from the axis of the rotor core 1 .

[0056] Specifically, Figure 1 and Figure 3 As shown, in a single magnet slot group 12, the size of the magnet slots 11 in the rotor circumferential direction gradually increases along the direction away from the axial center of the rotor core 1. For example, the size of the innermost magnet slots 11 in the rotor core 1 circumferential direction is the smallest, and the size of the outermost magnet slots 11 in the rotor core 1 circumferential direction is the largest. The magnet slots 11 gradually increase in size from the inner layer to the outer layer of the rotor core 1 in the rotor core 1 circumferential direction, thereby increasing the volume of the outermost magnet slots 11 and the weight of the outermost magnet 2, thereby further improving the torque density and power density of the rotor.

[0057] The rotor assembly 10 of the embodiment of the present disclosure gradually increases the size of the magnet slots 11 in the rotor circumferential direction away from the axial direction of the rotor core 1, increases the volume of the outermost magnet slots 11 and increases the weight of the outermost magnet 2, which can further improve the torque density and power density of the rotor, and further improve the rotation speed of the rotor.

[0058] In some embodiments, two adjacent magnet slots 11 in at least one magnet slot group 12 among the plurality of magnet slot groups 12 are alternately arranged in sequence along the same direction in the circumferential direction of the rotor core 1 .

[0059] Specifically, Figure 4 As shown, two adjacent magnet slots 11 in the same magnet slot group 12 are arranged alternately in the counterclockwise direction of the rotor core 1, or, two adjacent magnet slots 11 in the same magnet slot group 12 are arranged alternately in the clockwise direction of the rotor core.

[0060] In some embodiments, two adjacent magnet slots 11 in at least one magnet slot group 12 among the plurality of magnet slot groups 12 are staggered at a preset angle in the circumferential direction of the rotor core 1 .

[0061] Specifically, in the same magnet slot group 12, two adjacent magnet slots 11 are spaced apart and staggered at a preset angle in the circumferential direction of the rotor core 1, thereby forming a skew pole, which evenly distributes the weight of the magnet 2 in the circumferential direction of the rotor core 1, making the rotor more stable when rotating and reducing the torque pulsation of the rotor when working.

[0062] Furthermore, two adjacent magnet slots 11 in the same magnet slot group 12 within the multiple magnet slot groups 12 are staggered at a preset angle in the circumferential direction of the rotor core 1, further evenly arranging the weight of the magnet 2 in the circumferential direction of the rotor core 1, making the rotor more stable when rotating and reducing the torque pulsation of the rotor when working.

[0063] The rotor assembly 10 of the embodiment of the present disclosure arranges two adjacent magnet slots 11 in an alternating manner at a preset angle in the circumferential direction of the rotor core 1. This can further evenly distribute the weight of the magnet 2 in the circumferential direction of the rotor core 1, making the rotor more stable during rotation, reducing torque pulsation during operation of the rotor, reducing the rotation power consumption of the rotor, and improving the stability of the rotor during rotation.

[0064] In some embodiments, the rotor core 1 includes a multi-layer wound core sheet 13 , on which a plurality of first grooves 131 arranged at intervals are disposed, and the plurality of first grooves 131 form a magnet slot 11 .

[0065] Specifically, Figure 1 and Figure 5 As shown, a plurality of first grooves 131 arranged at intervals are provided on the core sheet 13, and the plurality of first grooves 131 are formed into the magnet slots 11 by stamping and winding. The core sheets 13 wound in multiple layers are stamped and wound to form the rotor core 1. By providing the core sheets in multiple layers, the eddy current loss of the rotor core 1 during use can be reduced, thereby improving the energy conversion rate of the rotor core 1 during use, thereby reducing the power consumption of the rotor during operation.

[0066] Furthermore, the rotor core 1 is made of soft magnetic material or silicon steel sheet material, which can reduce eddy current losses of the rotor during operation and improve the stability and safety of the rotor operation.

[0067] The rotor assembly 10 of the embodiment of the present disclosure, by providing a multi-layer core skin, the rotor core 1 is made of soft magnetic material or silicon steel sheet material, which can reduce the eddy current loss of the rotor core 1 when in use, thereby improving the energy conversion rate of the rotor core 1 when in use, thereby reducing the power consumption of the rotor when working, reducing the rotational power consumption of the rotor, and improving the stability and safety of the rotor assembly 10 when in use.

[0068] In some embodiments, a magnetic bridge 14 is provided between two adjacent magnet slots 11 in each magnet slot group 12 .

[0069] Specifically, Figure 5 and Figure 7 As shown, in the same magnet slot group 12, a magnetic bridge 14 is provided between two adjacent magnet slots 11. In other words, there are multiple magnetic bridges 14, and the magnet 2 is provided between two adjacent magnetic bridges 14, so that the adjacent magnetic bridges 14 can fix the magnet 2. For example, structural glue is provided between the magnetic bridge 14 and the magnet 2 to fix the magnet 2, thereby reducing leakage magnetism and improving the stability and safety of the magnet 2 when in use.

[0070] The rotor assembly 10 of the embodiment of the present disclosure can fix the magnet 2 by providing the magnetic bridge 14, thereby reducing magnetic leakage and improving the stability and durability of the magnet 2 when the rotor is working.

[0071] In some embodiments, there is a magnetic isolation groove 15 between two adjacent magnet grooves 11 , and the magnetic isolation groove 15 corresponds to the position of the magnetic bridge 14 . The core piece 13 also has a plurality of second grooves 132 , and the plurality of second grooves 132 form the magnetic isolation groove 15 .

[0072] Specifically, Figure 5 and Figure 7 As shown, there is a magnetic isolation slot 15 between two adjacent magnet slots 11, which will further avoid magnetic leakage during the operation of the rotor. Furthermore, there are multiple magnetic isolation slots 15 between two adjacent magnet slots 11, which will further avoid excessive magnetic leakage and improve the stability of the rotor during operation.

[0073] A plurality of second grooves 132 are provided on the core sheet 13 so as to form magnetic isolation grooves 15 during subsequent stamping and winding, thereby reducing eddy current losses of the rotor during operation and improving the stability and safety of the rotor operation.

[0074] In some embodiments, an elastic member 16 is disposed on the rotor core 1 . The elastic member 16 is located at the opening of the magnet slot 11 , and the elastic member 16 is suitable for abutting against the magnet 2 to fix the magnet 2 in the magnet slot 11 .

[0075] Specifically, Figure 1 and Figure 6 As shown, the elastic member 16 is located at the opening of the magnet slot 11. For example, there may be multiple elastic members 16, and the multiple elastic members 16 are arranged at both ends of the magnet slot 11 in the circumferential direction of the core rotor, or the multiple elastic members 16 are arranged at both ends of the core rotor in the radial direction.

[0076] When the magnet 2 is installed in the magnet slot 11 , the elastic member 16 is deformed. After the magnet 2 is fixed to the magnet slot 11 , the elastic member 16 returns to its original shape to fix the magnet 2 . For example, the elastic piece fixes the magnet 2 in the front-to-back direction.

[0077] The elastic member 16 is connected to the front end surface of the rotor core 1 . By providing the elastic member 16 , a plurality of magnets 2 can be fixed.

[0078] The rotor assembly 10 of the embodiment of the present disclosure is provided with an elastic member 16, and the elastic member 16 is connected to the front end surface of the rotor core 1. By providing the elastic member 16, multiple magnets 2 can be fixed to improve the stability of the magnets 2 when the rotor is working.

[0079] In some embodiments, the rotor core 1 has a plurality of welding grooves 17 , and the welding grooves 17 are located on a side of the rotor core 1 away from the air gap, the welding grooves 17 extend radially of the rotor core 1 , and the plurality of welding grooves 17 are spaced apart along the circumferential direction of the rotor core 1 .

[0080] Specifically, Figures 1 to 8 As shown, a plurality of welding grooves 17 are provided on the rear end surface of the rotor core 1 , and the plurality of welding grooves 17 are arranged at intervals in the circumferential direction of the rotor core 1 .

[0081] The rotor assembly 10 of the embodiment of the present disclosure is provided with a plurality of welding grooves 17, which are arranged at intervals in the circumferential direction of the rotor core 1 and extend in the radial direction of the rotor core 1, thereby increasing the welding area between the bracket 4 and the rotor core 1, thereby increasing the connection strength between the bracket 4 and the rotor core 1 and improving the stability of the rotor during operation.

[0082] In some embodiments, the number of welding slots 17 is K, and K=mp, where p=1 or 2, and m is the number of magnet slot groups 12 .

[0083] Specifically, Figures 1 to 8 As shown, the number of welding slots 17 is set by the number of magnet slot groups 12, and then the connection strength between the bracket 4 and the rotor core 1 is set. When the number of magnet slot groups 12 is large, the number of magnets 2 increases, and the torque density of the motor increases accordingly. At this time, the number of welding slots 17 is increased to improve the strength of the connection structure between the bracket 4 and the rotor.

[0084] p=1 or 2. When the motor torque is large, p is set to 2 to prevent the welding points on the welding grooves 17 from falling off during the operation of the rotor. When the motor torque is small, p is set to 1 to ensure that the welding points on the welding grooves 17 do not fall off during the operation of the rotor, thereby reducing the production cost.

[0085] The rotor assembly 10 of the embodiment of the present disclosure is provided with a plurality of welding slots 17, the number of which is set corresponding to the number of magnet slot groups 12, so as to improve the strength of the connection structure between the bracket 4 and the rotor and improve the stability of the rotor during operation. By setting p to 1 or 2, the connection strength between the bracket 4 and the rotor core 1 can be changed during design and production to meet different rotor production and manufacturing requirements, thereby improving the stability of the rotor during operation.

[0086] In some embodiments, the rotor assembly 10 further includes a rotor sleeve 3 , which surrounds the outside of the rotor core 1 .

[0087] Specifically, Figures 1 to 10 As shown, the rotor sheath 3 is sleeved on the outer circumference of the rotor core 1 to prevent the rotor from colliding with other components in the motor during operation. The material of the rotor sheath 3 can be an existing material, for example, the material of the rotor sheath 3 can be carbon fiber. Alternatively, the material of the rotor sheath 3 can be titanium alloy.

[0088] The rotor assembly 10 of the embodiment of the present disclosure can avoid collision between the rotor and internal components of the motor during operation by providing a rotor sleeve 3, thereby improving the stability and safety of the rotor during operation. Furthermore, the rotor sleeve 3 can be made of titanium alloy to facilitate heat conduction to the rotor, or the rotor sleeve 3 can be made of carbon fiber to avoid eddy currents and losses during operation of the rotor.

[0089] The motor of the disclosed embodiment includes a rotor, a stator 20 and a rotating shaft 30, wherein the stator 20 is sleeved on the rotating shaft 30, and the rotor is a rotor assembly 10 of any one of the above items, wherein the rotor is sleeved on the rotating shaft 30, and the bracket 4 is connected to the rotating shaft 30, and the rotor and the stator 20 are spaced apart in the axial direction of the rotating shaft 30 and an air gap is formed therebetween.

[0090] Specifically, Figures 1 to 10 As shown, the rotor and the stator 20 are spaced apart in the axial direction of the rotating shaft 30 , and an air gap is formed between the rotor and the stator 20 to avoid direct contact between the stator 20 and the rotor, thereby improving the stability of the rotor operation, and the air gap can also be used for heat dissipation between the rotor and the stator 20 .

[0091] The motor of the embodiment of the present disclosure adopts the above-mentioned rotor assembly 10, which can reduce the restrictive effect of the centrifugal force of the magnetic steel on the rotor speed and increase the rotor speed.

[0092] In some embodiments, two adjacent magnet slots 11 are staggered at a preset angle in the circumferential direction of the rotor core 1 , the preset angle is A, and A≤360 / (s1*(n-1)), where s1 is the number of stator slots, and n is the number of magnet slots 11 in the magnet slot group 12 .

[0093] Specifically, Figures 1 to 10 As shown, in the same magnet slot group 12, two adjacent magnet slots 11 are staggered at a preset angle in the circumferential direction of the rotor core 1, thereby forming a skewed pole, which can reduce the torque pulsation when the rotor is working and reduce the power consumption when the rotor is running. n can be understood as the number of magnet slots 11, and s1 is the number of stator slots.

[0094] By setting the angle A according to the number of magnet slots 11 and the number of stator slots, the degree of offset of the staggered arrangement of adjacent magnet slots 11 in the circumferential direction of the rotor core 1 can be determined, and then the rotor can be manufactured accordingly to reduce the torque pulsation of the rotor during operation, reduce the power consumption of the rotor during operation, and improve the stability of the rotor operation.

[0095] The motor of the embodiment of the present disclosure sets the angle A by the number of magnet slots 11 and the number of stator slots, and can determine the degree of offset of the staggered arrangement of adjacent magnet slots 11 in the circumferential direction of the rotor core 1, and then manufacture the rotor accordingly, thereby reducing the torque pulsation of the rotor when it is working, reducing the power consumption of the rotor when it is running, and improving the stability of the rotor operation.

[0096] The vehicle according to the embodiment of the present disclosure includes the motor as described above or the rotor assembly 10 as described above.

[0097] The vehicle of the embodiment of the present disclosure adopts the above-mentioned rotor assembly 10 or motor, which can reduce the restrictive effect of the centrifugal force of the magnetic steel on the rotor speed and increase the rotor speed. In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0098] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present disclosure, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0099] In the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0100] In the present disclosure, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0101] In the present disclosure, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0102] Although the embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present disclosure. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present disclosure.

Claims

1. A rotor assembly, characterized in that: include: Bracket; A rotor core, the rotor core is connected to the bracket, a plurality of magnet slots are provided on the rotor core, and the plurality of magnet slots are arranged at intervals along the circumference of the rotor core; A plurality of magnets are connected to the rotor core, and the plurality of magnets are respectively embedded in a plurality of magnet slots, the plurality of magnet slots are divided into a plurality of magnet slot groups, the plurality of magnet slot groups are arranged at intervals along the circumference of the rotor core, the magnet slot groups include a plurality of magnet slots, and the plurality of magnet slots in each magnet slot group are arranged at intervals along the radial direction of the rotor core.

2. The rotor assembly according to claim 1, characterized in that The magnet slots have the same radial dimensions of the rotor, or the radial dimensions of the multiple magnet slots in at least one magnet slot group among the multiple magnet slot groups gradually decrease in the direction away from the axis of the rotor core.

3. The rotor assembly according to claim 1, characterized in that: The size of the multiple magnet slots in at least one magnet slot group among the multiple magnet slot groups in the circumferential direction of the rotor core gradually increases along the direction away from the axis of the rotor core.

4. The rotor assembly according to claim 1, characterized in that: Two adjacent magnet slots in at least one magnet slot group among the plurality of magnet slot groups are alternately arranged in sequence along the same direction in the circumferential direction of the rotor core.

5. The rotor assembly according to claim 4, characterized in that: Two adjacent magnet slots in at least one magnet slot group among the plurality of magnet slot groups are staggered at a preset angle in the circumferential direction of the rotor core.

6. The rotor assembly according to any one of claims 1 to 5, characterized in that: The rotor core comprises a multi-layer wound core sheet, on which a plurality of first grooves arranged at intervals are provided, and the plurality of first grooves surround the magnet slot.

7. The rotor assembly according to claim 6, characterized in that A magnetic bridge is provided between two adjacent magnet slots in each magnet slot group.

8. The rotor assembly according to claim 7, characterized in that There is a magnetic isolation groove between two adjacent magnet grooves, and the magnetic isolation groove corresponds to the position of the magnetic bridge. The iron core sheet also has a plurality of second grooves, and the plurality of second grooves surround the magnetic isolation groove.

9. The rotor assembly according to claim 7, characterized in that: An elastic member is provided on the rotor core, the elastic member is located at the opening of the magnet slot, and the elastic member is suitable for abutting against the magnet to fix the magnet in the magnet slot.

10. The rotor assembly according to any one of claims 1 to 5, characterized in that: The rotor core is provided with a plurality of welding grooves, and the welding grooves are located on a side of the rotor core away from the air gap, the welding grooves extend in the radial direction of the rotor core, and the plurality of welding grooves are arranged at intervals along the circumferential direction of the rotor core.

11. The rotor assembly according to claim 10, characterized in that The number of the welding slots is K, and K=mp, wherein p=1 or 2, and m is the number of magnet slot groups.

12. The rotor assembly according to claim 1, characterized in that A rotor sleeve is also included, which surrounds the outside of the rotor core.

13. A motor, characterized in that: include: A stator and a rotating shaft, wherein the stator is sleeved on the rotating shaft; The rotor is a rotor assembly according to any one of claims 1 to 12, wherein the rotor is sleeved on the rotating shaft, and the bracket is connected to the rotating shaft, and the rotor and the stator are spaced apart in the axial direction of the rotating shaft and an air gap is formed therebetween.

14. The motor according to claim 13, characterized in that Two adjacent magnet slots are staggered at a preset angle in the circumferential direction of the rotor core, the preset angle is A, and A≤360 / (s1*(n-1)), where s1 is the number of stator slots and n is the number of magnet slots in the magnet slot group.

15. A vehicle, characterized in that: Comprising an electric machine as claimed in claim 13 or 14 or a rotor assembly as claimed in claims 1-12.

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