Motor rotor and motor

Abstract

The utility model discloses a motor rotor and a motor, and belongs to the technical field of motors. The motor rotor comprises a rotor core, a plurality of permanent magnets, a plurality of magnetic barriers and a plurality of first magnetic isolation bridges. Wherein the rotor core is provided with a first arc-shaped mounting groove, a permanent magnet is accommodated in a first sub-groove in the first arc-shaped mounting groove, magnetic barriers are accommodated in a second sub-groove and a third sub-groove, and the magnetic barriers are arranged at the two ends of the permanent magnet, so that the demagnetization resistance of the motor can be enhanced; moreover, two first magnetic isolation bridges can be arranged in each first arc-shaped mounting groove and are used for enhancing the mechanical strength of the motor rotor and reducing the vibration and deformation of the motor rotor during high-speed operation, and meanwhile, the two first magnetic isolation bridges are arranged at the two ends of the permanent magnets, so that the number of the permanent magnets in the motor rotor can be reduced, and the service life of the motor rotor is prolonged. The assembling steps of the motor rotor are simplified, and the breaking failure rate and the installation cost in the assembling process of the permanent magnet are reduced.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a motor rotor and a motor. Background Technology

[0002] With the development of mechanical device technology, the requirements for motors are becoming increasingly stringent. Currently, motors typically include permanent magnet synchronous motors (PMSM), synchronous reluctance motors (SynRM), and permanent magnet assisted synchronous reluctance motors (PMa-SynRM). Among them, permanent magnet assisted synchronous reluctance motors combine the advantages of permanent magnet synchronous motors and synchronous reluctance motors, featuring high efficiency, high power density, and a wide speed range.

[0003] A permanent magnet assisted synchronous reluctance motor typically includes a stator and a rotor. The rotor can include a rotor core and permanent magnets. The permanent magnets can be embedded in mounting slots in the rotor core to provide an additional magnetic field, thereby improving torque and efficiency. Since the motor rotor usually employs a multi-pole design, magnetic bridges are placed between adjacent permanent magnets in the same layer of poles to improve the structural strength of the motor rotor.

[0004] However, the large number of permanent magnets in the aforementioned motor rotor makes the assembly process quite complicated. Utility Model Content

[0005] This utility model provides a motor rotor and a motor. It solves the problems of the large number of permanent magnets and the cumbersome assembly steps of the motor rotor in existing technologies. The technical solution is as follows:

[0006] According to one aspect of the present invention, a motor rotor is provided, the motor rotor comprising: a rotor core, a plurality of permanent magnets, a plurality of magnetic barriers and a plurality of first magnetic isolation bridges;

[0007] The rotor core has a plurality of mounting slot groups arranged circumferentially along the rotor core, and any one of the mounting slot groups includes a plurality of arc-shaped mounting slots arranged radially at intervals along the rotor core.

[0008] The plurality of arc-shaped mounting slots include a first arc-shaped mounting slot, and any one of the first arc-shaped mounting slots includes a first sub-slot, a second sub-slot, and a third sub-slot, wherein the second sub-slot and the third sub-slot are respectively located at both ends of the first sub-slot;

[0009] The permanent magnet is housed in any one of the first sub-slots, and the magnetic barrier is housed in any one of the second sub-slots and any one of the third sub-slots.

[0010] A first magnetic isolation bridge is arranged between the first sub-slot and the second sub-slot in any of the first arc-shaped mounting slots, and a first magnetic isolation bridge is also arranged between the first sub-slot and the third sub-slot in any of the first arc-shaped mounting slots. The two ends of the first magnetic isolation bridge are fixedly connected to the rotor core.

[0011] Optionally, the extension direction of the first magnetic bridge is parallel to the tangential direction of the rotor core.

[0012] Optionally, the plurality of arc-shaped mounting slots further include a second arc-shaped mounting slot, the second arc-shaped mounting slot being located on the side of the first arc-shaped mounting slot near the outer edge of the rotor cell;

[0013] The second arc-shaped mounting groove includes a fourth sub-groove and a fifth sub-groove. The fifth sub-groove is located at the end of the fourth sub-groove closer to the third sub-groove. The permanent magnet is housed in any one of the fourth sub-groos, and the magnetic barrier is housed in any one of the fifth sub-groos.

[0014] In the extending direction of the first arc-shaped mounting groove, the length of the third sub-groove is greater than the length of the second sub-groove.

[0015] Optionally, the outer contour of any arc-shaped mounting groove is symmetrical about the magnetic pole centerline, where the magnetic pole centerline is the shortest line connecting the center of the arc-shaped mounting groove and the center of the rotor core.

[0016] The permanent magnet is asymmetrical about the center line of the magnetic pole;

[0017] The two magnetic barriers in the second and third sub-slots of any one of the first arc-shaped mounting slots are asymmetrical about the center line of the magnetic pole.

[0018] Optionally, the angle between the magnetic pole centerline and the d-axis is greater than 0° and less than or equal to 10°.

[0019] Optionally, the motor rotor further includes a plurality of second magnetic isolation bridges, wherein the two ends of any one of the arc-shaped mounting slots are arranged between the second magnetic isolation bridges and the edge of the rotor core, and the two ends of the second magnetic isolation bridges are fixedly connected to the rotor core.

[0020] Optionally, the magnetic barrier located in the first arc-shaped mounting groove can satisfy the following relationship:

[0021] 2L2≤L1≤2W1;

[0022] Wherein, L2 is the width of the second magnetic bridge along the extension direction of the arc-shaped mounting groove, L1 is the length of the magnetic barrier along the extension direction of the arc-shaped mounting groove, and W1 is the width of the magnetic barrier.

[0023] Optionally, the number of the first arc-shaped mounting slots in any one of the mounting slot groups is two, and the number of the second arc-shaped mounting slots is one;

[0024] The two first arc-shaped mounting slots are arranged at radial intervals along the rotor core;

[0025] The second arc-shaped mounting groove is located on the side of the two arc-shaped mounting grooves near the edge of the rotor core.

[0026] Optionally, the magnetic barrier in the first arc-shaped mounting groove includes a non-magnetic structure formed of air, epoxy resin, or polyester fiber.

[0027] The magnetic barrier in the second arc-shaped mounting groove includes a non-magnetic structure formed of epoxy resin or polyester fiber.

[0028] According to another aspect of the present invention, an electric motor is provided, the electric motor comprising: an electric motor rotor, an electric motor stator, and an electric motor housing;

[0029] The motor rotor is the motor rotor described above, the motor stator is sleeved on the outside of the motor rotor, and the motor housing is sleeved on the outside of the motor stator.

[0030] The beneficial effects of the technical solution provided by this utility model embodiment include at least the following:

[0031] A motor rotor is provided, comprising a rotor core, multiple permanent magnets, multiple magnetic barriers, and multiple first magnetic isolation bridges. The rotor core has a first arc-shaped mounting slot. A permanent magnet is housed in a first sub-slot within the first arc-shaped mounting slot, while magnetic barriers are housed in both the second and third sub-slots. By placing magnetic barriers at both ends of the permanent magnets, the influence of demagnetizing magnetic fields on the permanent magnets can be reduced, enhancing the motor's resistance to demagnetization. Furthermore, two first magnetic isolation bridges can be placed in each first arc-shaped mounting slot to enhance the mechanical strength of the motor rotor, reducing vibration and deformation during high-speed operation. Simultaneously, placing two first magnetic isolation bridges at both ends of the permanent magnets reduces the number of permanent magnets in the motor rotor, simplifies the assembly process, and lowers the breakage rate and installation cost during permanent magnet assembly. This solution addresses the problems of a large number of permanent magnets and cumbersome assembly procedures in related technologies. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of an electric motor rotor;

[0034] Figure 2 This is a schematic diagram of a partial structure of an electric motor;

[0035] Figure 3 yes Figure 2 The diagram shows the relationship between the motor's torque and the current angle.

[0036] Figure 4 This is a schematic diagram of the structure of a motor rotor provided in an embodiment of the present invention;

[0037] Figure 5 This is a partial structural schematic diagram of an electric motor provided in an embodiment of the present utility model;

[0038] Figure 6 This is a schematic diagram of the structure of an installation slot assembly provided in an embodiment of this utility model;

[0039] Figure 7 This is a partial structural schematic diagram of another motor provided in an embodiment of the present utility model;

[0040] Figure 8 This is a partial structural schematic diagram of a motor rotor provided in an embodiment of the present utility model;

[0041] Figure 9 This is a schematic diagram illustrating the relationship between the torque and current angle of a motor, provided by an embodiment of this utility model.

[0042] Figure 10 yes Figure 8 A partial structural schematic diagram of the motor rotor is shown;

[0043] Figure 11 This is a simulation diagram of a motor rotor provided in an embodiment of the present utility model;

[0044] Figure 12 This is a simulation diagram of a motor rotor in related technologies. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0046] Although the present invention can be readily embodied in various forms, only some specific embodiments are shown in the accompanying drawings and will be described in detail in this specification. It is understood that this specification should be regarded as an exemplary illustration of the principles of the present invention and is not intended to limit the present invention to what is described herein.

[0047] Therefore, a feature pointed out in this specification is used to describe one feature of one embodiment of the present invention, and does not imply that every embodiment of the present invention must have the described feature. Furthermore, it should be noted that this specification describes many features. Although certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0048] In the embodiments shown in the accompanying drawings, the directional indications (such as up, down, left, right, front, and back) used to explain the structure and movement of the various elements of this invention are relative rather than absolute. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, these directional indications also change accordingly.

[0049] Please refer to Figure 1 , Figure 2 and Figure 3 , Figure 1 This is a schematic diagram of the structure of a motor rotor 11. Figure 2 This is a schematic diagram of a partial structure of an electric motor. Figure 3 yes Figure 2 The diagram shown illustrates the relationship between the motor's torque and current angle, where... Figure 2 The partial structure of the motor rotor 11 in the illustrated motor structure is as follows: Figure 1 A partial structural schematic diagram of the motor rotor 11 is shown. Figure 2 The illustrated motor may include a permanent magnet assisted synchronous reluctance motor. A permanent magnet assisted synchronous reluctance motor typically includes a stator 12 and a rotor 11. The rotor 11 may include a rotor core 111 and permanent magnets 112. The permanent magnets 112 can be embedded in mounting slots in the rotor core 111 to provide an additional magnetic field, thereby improving torque and efficiency. To increase the saliency ratio and reluctance torque, the rotor 11 typically employs a multi-pole design. Therefore, magnetic isolation bridges 113 (also called reinforcing ribs) are provided between adjacent permanent magnets 112 in the same pole layer to improve the structural strength of the rotor 11.

[0050] However, the thickness of the permanent magnet 112 under each magnetic pole in the above-mentioned motor is relatively small in the magnetization direction. When a large reverse demagnetizing magnetic field is input from the outside, the permanent magnet 112 has a weak anti-demagnetization ability and is more prone to irreversible demagnetization.

[0051] Furthermore, the presence of the magnetic bridge 113 results in a larger number of permanent magnets 112 in the motor rotor 11, making the assembly process of the motor rotor 11 more complicated. For example... Figure 2As shown, if no magnetic isolation bridge 113 is provided in each layer of magnetic poles, the number of permanent magnets 112 in this local structure is 3; after the magnetic isolation bridge 113 is provided, the number of permanent magnets 112 in this local structure is 5, which leads to an increase of about 30% in the breakage failure rate and installation cost of permanent magnets 112 during assembly.

[0052] In addition, such as Figure 3 As shown, Figure 3 The horizontal axis represents the current angle, measured in elec.deg, and the vertical axis represents the torque, measured in Nm. During motor operation, the permanent magnet torque (Tpm) is at its maximum when the current angle is 0°, gradually decreasing as the current angle increases. The reluctance torque (Tre) is at its maximum when the current angle is between 45° and 60°. The difference between the current angle corresponding to the peak reluctance torque and the peak permanent magnet torque is significant, typically exceeding 45°. This results in the peak value of the motor's electromagnetic torque (i.e., the sum of the permanent magnet torque and the reluctance torque) not being equal to the sum of the peak permanent magnet torque and the peak reluctance torque, leading to lower utilization rates of both permanent magnet torque and reluctance torque during motor operation.

[0053] This utility model provides a motor rotor and a motor, which can solve some or all of the above-mentioned technical problems.

[0054] Please refer to Figure 4 , Figure 5 and Figure 6 , Figure 4 This is a schematic diagram of the structure of a motor rotor 20 provided in an embodiment of the present invention. Figure 5 This is a partial structural diagram of a motor provided in an embodiment of the present invention. Figure 6 This is a schematic diagram of the structure of a mounting slot assembly 211 provided in an embodiment of the present invention, wherein, Figure 5 The partial structure of the motor rotor 20 in the partial structure of the motor shown is as follows: Figure 4 The diagram shows a partial structural schematic of the motor rotor 20. Figure 5 The stator 30 of the motor is also included in the structure. The rotor 20 of the motor may include: a rotor core 21, multiple permanent magnets 22, multiple magnetic barriers 23 and multiple first magnetic isolation bridges 24.

[0055] The rotor core 21 may have multiple mounting slot groups 211 arranged circumferentially along the rotor core 21, and any mounting slot group 211 includes multiple arc-shaped mounting slots arranged radially at intervals along the rotor core 21. For example... Figure 6 As shown, the rotor core 21 may have six mounting slot groups 211 arranged circumferentially along the rotor core 21. Each mounting slot group 211 includes three arc-shaped mounting slots, and each arc-shaped mounting slot protrudes toward the axis of the rotor core 21.

[0056] Multiple arc-shaped mounting slots may include a first arc-shaped mounting slot c1. Any one of the first arc-shaped mounting slots c1 includes a first sub-slot c11, a second sub-slot c12, and a third sub-slot c13. The second sub-slot c12 and the third sub-slot c13 are located at the two ends of the first sub-slot c11, respectively.

[0057] A permanent magnet 22 is housed in any of the first sub-slots c11, and magnetic barriers 23 are housed in any of the second sub-slots c12 and any of the third sub-slots c13. That is, in each first arc-shaped mounting slot c1, one permanent magnet 22 can be located in the first sub-slot c11, and two magnetic barriers 23 can be located at the two ends of the permanent magnet 22. Any one of the magnetic barriers 23 can be strip-shaped.

[0058] During motor operation, a demagnetizing effect occurs. This effect refers to the phenomenon where the direct-axis component of the current in the motor stator 30 may generate a magnetic field opposite to the magnetic field of the permanent magnet 22 in the motor rotor 20, thereby weakening the magnetic field strength of the permanent magnet 22. If the demagnetizing effect is too strong, it may cause partial or complete demagnetization of the permanent magnet 22, affecting the motor's operating performance. The magnetic barrier 23 is a high magnetic reluctance region, typically composed of non-magnetic materials (such as air gaps or non-magnetic materials). In this embodiment of the invention, by setting magnetic barriers 23 at both ends of the permanent magnet 22, the influence of the demagnetizing magnetic field on the permanent magnet 22 can be reduced, enhancing the motor's resistance to demagnetization.

[0059] For example, such as Figure 5 As shown, setting a magnetic barrier 23 in the direction of the direct-axis demagnetizing magnetic field can increase the magnetic resistance of the direct-axis magnetic circuit, thereby limiting the propagation of the direct-axis demagnetizing magnetic field, reducing the demagnetizing magnetic field reaching the surface of the permanent magnet 22, protecting the permanent magnet 22, and improving the motor's anti-demagnetizing ability and reliability.

[0060] A first magnetic isolation bridge 24 is arranged between the first sub-slot c11 and the second sub-slot c12 in any one of the first arc-shaped mounting slots c1, and a first magnetic isolation bridge 24 is also arranged between the first sub-slot c11 and the third sub-slot c13 in any one of the first arc-shaped mounting slots c1. The two ends of the first magnetic isolation bridge 24 are fixedly connected to the rotor core 21. It can be understood that the magnetic isolation bridge in this embodiment can also be called a reinforcing rib. In an exemplary embodiment, the multiple first magnetic isolation bridges 24 can all be strip-shaped, and the multiple first magnetic isolation bridges 24 can all be made of the same material as the rotor core 21. For example, the multiple first magnetic isolation bridges 24 are all made of silicon steel.

[0061] Each first arc-shaped mounting slot c1 may have two first magnetic isolation bridges 24, which are used to enhance the mechanical strength of the motor rotor 20, reduce the vibration and deformation of the motor rotor 20 during high-speed operation, and thus improve the operating stability of the motor. In addition, the two first magnetic isolation bridges 24 can be used to fix the permanent magnet 22 and prevent the permanent magnet 22 from falling off or shifting due to centrifugal force during high-speed rotation. Furthermore, the first magnetic isolation bridges 24 can isolate the first sub-slot c11, the second sub-slot c12 and the third sub-slot c13 in the first arc-shaped mounting slot c1, thereby forming magnetic barriers 23 at both ends of the permanent magnet 22.

[0062] By setting two first magnetic isolation bridges 24 at both ends of the permanent magnet 22, the number of permanent magnets 22 in the motor rotor 20 can be reduced, the assembly steps of the motor rotor 20 can be simplified, and the breakage rate and installation cost of the permanent magnets 22 during the assembly process can be reduced.

[0063] In summary, this utility model embodiment provides a motor rotor 20 including a rotor core 21, multiple permanent magnets 22, multiple magnetic barriers 23 and multiple first magnetic isolation bridges 24. The rotor core 21 has a first arc-shaped mounting groove c1. A permanent magnet 22 is housed in the first sub-groove c11 of the first arc-shaped mounting groove c1, and magnetic barriers 23 are housed in the second sub-groove c12 and the third sub-groove c13. By setting magnetic barriers 23 at both ends of the permanent magnet 22, the influence of the demagnetizing magnetic field on the permanent magnet 22 can be reduced, enhancing the motor's anti-demagnetizing capability. Furthermore, two first magnetic isolation bridges 24 can be set in each first arc-shaped mounting groove c1 to enhance the mechanical strength of the motor rotor 20, reducing vibration and deformation of the motor rotor 20 during high-speed operation. Simultaneously, by placing two first magnetic isolation bridges 24 at both ends of the permanent magnet 22, the number of permanent magnets 22 in the motor rotor 20 can be reduced, simplifying the assembly steps of the motor rotor 20 and reducing the breakage failure rate and installation cost during the assembly process of the permanent magnet 22. This solves the problem of the cumbersome assembly steps of the motor rotor 20 in related technologies.

[0064] Please refer to Figure 4 and Figure 5 In an optional embodiment, the extension direction of the first magnetic isolation bridge 24 can be parallel to the tangential direction of the rotor core 21, which can refer to the tangential direction along the circumference of the motor rotor 20. The extension direction of the first magnetic isolation bridge 24 can refer to the length direction of the first magnetic isolation bridge 24. Compared with the first magnetic isolation bridge 24 extending radially along the rotor core 21, the first magnetic isolation bridge 24 extending tangentially along the rotor core 21 in this embodiment of the invention can better resist tangential stress and improve the mechanical stability of the motor rotor 20. The first magnetic isolation bridge 24 can be integrally formed with the rotor core 21 to further enhance the structural strength of the motor rotor 20.

[0065] Optionally, the magnetic barrier 23 located in the first arc-shaped mounting slot c1 includes a non-magnetic structure formed of air, epoxy resin, or polyester fiber. For example, neither the second sub-slot c12 nor the third sub-slot c13 is filled with any material (i.e., air), which can improve the heat dissipation effect of the rotor core 21 and the permanent magnet 22.

[0066] Please refer to Figure 7 and Figure 8 , Figure 7 This is a partial structural diagram of another motor provided in an embodiment of the present invention. Figure 8 This is a partial structural diagram of a motor rotor 20 provided in an embodiment of the present invention. In an optional embodiment, the plurality of arc-shaped mounting slots may further include a second arc-shaped mounting slot c2, which is located on the side of the first arc-shaped mounting slot c1 near the outer edge of the rotor cell. The second arc-shaped mounting slot c2 includes a fourth sub-slot c21 and a fifth sub-slot c22. The fifth sub-slot c22 is located at the end of the fourth sub-slot c21 closer to the third sub-slot c13. A permanent magnet 22 is accommodated in any of the fourth sub-slots c21, and a magnetic barrier 23 is accommodated in any of the fifth sub-slots c22. In the extending direction of the first arc-shaped mounting slot, the length of the third sub-slot c13 is greater than the length of the second sub-slot c12. A magnetic barrier 23 may be provided at one end of the permanent magnet 22 located in the second arc-shaped mounting slot c2.

[0067] Optionally, the magnetic barrier 23 located in the second arc-shaped mounting groove c2 comprises a non-magnetic structure formed of epoxy resin or polyester fiber. The magnetic barrier 23 located in the second arc-shaped mounting groove c2 can also serve to fix the permanent magnet 22 located in the second arc-shaped mounting groove c2.

[0068] Please refer to Figure 7 and Figure 8 In one optional embodiment, the outer contour of any arc-shaped mounting slot is symmetrical about the magnetic pole centerline z1, which is the shortest line connecting the center of the arc-shaped mounting slot and the center of the rotor core 21; any permanent magnet 22 is asymmetrical about the magnetic pole centerline z1; and the two magnetic barriers 23 in the second sub-slot c12 and the third sub-slot c13 of any first arc-shaped mounting slot c1 are asymmetrical about the magnetic pole centerline z1. Multiple permanent magnets 22 in a mounting slot group 211 can all be offset in the same direction, forming an asymmetrical magnetic pole structure about the magnetic pole centerline z1.

[0069] In this embodiment of the invention, the number of permanent magnets 22 can be equal to the number of arc-shaped mounting grooves, and the permanent magnets 22 may include neodymium iron boron, ferrite, or samarium iron nitrogen.

[0070] In one alternative embodiment, the angle β between the magnetic pole centerline z1 and the d-axis is greater than 0° and less than or equal to 10°. The angle β between the magnetic pole centerline z1 and the d-axis can be called the d-axis offset angle, which satisfies the following relationship: 0°<β≤10°.

[0071] For example, please refer to Figure 9 , Figure 9 This is a schematic diagram illustrating the relationship between torque and current angle of a motor according to an embodiment of this utility model. The motor rotor 20 in this embodiment is the motor rotor 20 of this utility model. In this utility model embodiment, through the asymmetrical design of the magnetic poles, the magnetic field is shifted. At this time, the current angle when the permanent magnet torque value is maximum is 0°+β, where 0°<β≤10°, making the difference between the current angle corresponding to the peak point of the permanent magnet torque and the current angle corresponding to the peak point of the reluctance torque smaller. Thus, the current angle when the electromagnetic torque value is maximum is 0°+α, where 10°≤α≤45°. Compared with the related technology, where the range of α when the magnetic field is not shifted is 10°~60°, the range of the current angle when the electromagnetic torque value is maximum in this embodiment is significantly reduced, thereby reducing the difference between the current angle corresponding to the peak point of the electromagnetic torque and the current angle corresponding to the peak point of the reluctance torque. It can be seen that, with the same amount of material, the output torque of the motor can be increased by more than 5%, or, with the same torque output value, the material consumption of the asymmetrically designed motor can be reduced by more than 5%.

[0072] When the d-axis offset angle is within the above range, the motor torque output is high. When the d-axis offset angle exceeds the above range, the amount of permanent magnet 22 in the motor rotor 20 is reduced, which may cause the permanent magnet magnetic field to decrease, making it difficult to increase the electromagnetic torque.

[0073] In one alternative implementation, please refer to Figure 4 , Figure 5 and Figure 6 Alternatively, only permanent magnet 22 can be set in the second arc-shaped mounting groove c2. Since the size of the second arc-shaped mounting groove c2 is smaller than that of the first arc-shaped mounting groove c1, even if the permanent magnet 22 in the second arc-shaped mounting groove c2 is not offset, it will not affect the asymmetrical design of the magnetic poles of the motor rotor 20 as a whole.

[0074] Please refer to Figure 10 , Figure 10 yes Figure 8The schematic diagram of a portion A1 of the motor rotor shown illustrates an optional embodiment where the motor rotor 20 may further include multiple second magnetic isolation bridges 25. A second magnetic isolation bridge 25 is arranged between the two ends of any arc-shaped mounting groove and the edge of the rotor core 21, and the two ends of the second magnetic isolation bridge 25 are fixedly connected to the rotor core 21. The multiple second magnetic isolation bridges 25 may be strip-shaped, and may be made of the same material as the rotor core 21. For example, the multiple second magnetic isolation bridges 25 may be made of silicon steel, and may be integrally formed with the rotor core 21.

[0075] In one alternative embodiment, the magnetic barrier 23 located in the first arc-shaped mounting groove c1 can satisfy the following relationship:

[0076] 2L2≤L1≤2W1;

[0077] Wherein, L2 is the width of the second magnetic bridge 25 along the extension direction of the arc-shaped mounting groove, L1 is the length of the magnetic barrier 23 along the extension direction of the arc-shaped mounting groove, and W1 is the width of the magnetic barrier 23.

[0078] If the length L1 of the magnetic barrier 23 in the extension direction of the arc-shaped mounting groove is too small, the demagnetization resistance of the motor rotor 20 may be reduced; if the length L1 of the magnetic barrier 23 in the extension direction of the arc-shaped mounting groove is too large, the overall structural strength may be reduced, and the amount of permanent magnet 22 may be too small, resulting in a large loss of permanent magnet torque and a decrease in electromagnetic torque. Within the above range, the magnetic barrier 23 in the first arc-shaped mounting groove c1 can play a good role in preventing demagnetization, while avoiding the impact of an excessively large magnetic barrier 23 on the electromagnetic torque and structural strength of the motor. The width L2 of the second magnetic isolation bridge 25 along the extension direction of the arc-shaped mounting groove is related to the structural strength of the motor rotor 20. For example, the width L2 of the second magnetic isolation bridge 25 along the extension direction of the arc-shaped mounting groove is the minimum size that meets the structural strength requirements.

[0079] Please refer to Figure 5 In one optional embodiment, the number of first arc-shaped mounting slots c1 in any mounting slot group 211 is two, and the number of second arc-shaped mounting slots c2 is one; the two first arc-shaped mounting slots c1 are arranged radially at intervals along the rotor core 21; the second arc-shaped mounting slots c2 are located on the side of the two arc-shaped mounting slots near the edge of the rotor core 21.

[0080] Please refer to Figure 11 , Figure 12 And Table 1, Figure 11 This is a simulation diagram of a motor rotor 20 provided in an embodiment of this utility model. Figure 12 This is a simulation diagram of a motor rotor 20 in related technologies. Figure 11The corresponding motor rotor 20 can be Figure 5 The motor rotor 20, Figure 12 The corresponding motor rotor can be Figure 1 The motor rotor in the middle.

[0081] Table 1

[0082]

[0083] from Figure 11 , Figure 12 As can be seen from Table 1, under the same demagnetizing magnetic field, compared with the motor rotor 20 in related technologies, the minimum magnetic flux density of the permanent magnet 22 of the motor rotor 20 in this embodiment of the present invention is increased by more than 15%; furthermore, the number and amount of permanent magnets 22 in this embodiment of the present invention are less, making the assembly steps of the motor rotor 20 simpler and the cost lower.

[0084] This utility model embodiment also provides an electric motor, which may include: a motor rotor, a motor stator, and a motor housing; the rotor core is used to sleeve the motor shaft, the rotor core includes the motor rotor in any of the above embodiments, the motor stator is sleeved on the outside of the motor rotor, and the motor housing is sleeved on the outside of the motor stator.

[0085] It should be noted that the dimensions of the areas may have been exaggerated in the accompanying drawings for clarity. Furthermore, it is understood that when an element is referred to as "on top of" another element, it can be directly on the other element, or there may be intermediate elements. Additionally, it is understood that when an element is referred to as "below" another element, it can be directly below the other element, or there may be more than one intermediate element. Furthermore, it is also understood that when an element is referred to as "between" two elements, it can be the only layer between the two elements, or there may be more than one intermediate element. Similar reference numerals throughout indicate similar elements.

[0086] In this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0087] The above description is only an optional embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A motor rotor, characterized in that, include: The rotor core consists of multiple permanent magnets, multiple magnetic barriers, and multiple first magnetic isolation bridges. The rotor core has a plurality of mounting slot groups arranged circumferentially along the rotor core, and any one of the mounting slot groups includes a plurality of arc-shaped mounting slots arranged radially at intervals along the rotor core. The plurality of arc-shaped mounting slots include a first arc-shaped mounting slot, and any one of the first arc-shaped mounting slots includes a first sub-slot, a second sub-slot, and a third sub-slot, wherein the second sub-slot and the third sub-slot are respectively located at both ends of the first sub-slot; The permanent magnet is housed in any one of the first sub-slots, and the magnetic barrier is housed in any one of the second sub-slots and any one of the third sub-slots. A first magnetic isolation bridge is arranged between the first sub-slot and the second sub-slot in any of the first arc-shaped mounting slots, and a first magnetic isolation bridge is also arranged between the first sub-slot and the third sub-slot in any of the first arc-shaped mounting slots. The two ends of the first magnetic isolation bridge are fixedly connected to the rotor core.

2. The motor rotor according to claim 1, characterized in that, The extension direction of the first magnetic isolation bridge is parallel to the tangential direction of the rotor core.

3. The motor rotor according to claim 1, characterized in that, The plurality of arc-shaped mounting slots also include a second arc-shaped mounting slot, which is located on the side of the first arc-shaped mounting slot near the outer edge of the rotor cell; The second arc-shaped mounting groove includes a fourth sub-groove and a fifth sub-groove. The fifth sub-groove is located at the end of the fourth sub-groove closer to the third sub-groove. The permanent magnet is housed in any one of the fourth sub-groos, and the magnetic barrier is housed in any one of the fifth sub-groos. In the extending direction of the first arc-shaped mounting groove, the length of the third sub-groove is greater than the length of the second sub-groove.

4. The motor rotor according to any one of claims 1-3, characterized in that, The outer contour of any arc-shaped mounting slot is symmetrical about the magnetic pole centerline, where the magnetic pole centerline is the shortest line connecting the center of the arc-shaped mounting slot and the center of the rotor core. Any one of the permanent magnets is asymmetrical about the center line of the magnetic pole; The two magnetic barriers in the second and third sub-slots of any one of the first arc-shaped mounting slots are asymmetrical about the center line of the magnetic pole.

5. The motor rotor according to claim 4, characterized in that, The angle between the center line of the magnetic pole and the d-axis is greater than 0° and less than or equal to 10°.

6. The motor rotor according to claim 2, characterized in that, The motor rotor also includes multiple second magnetic isolation bridges. A second magnetic isolation bridge is arranged between the two ends of any one of the arc-shaped mounting slots and the edge of the rotor core. The two ends of the second magnetic isolation bridge are fixedly connected to the rotor core.

7. The motor rotor according to claim 6, characterized in that, The magnetic barrier located in the first arc-shaped mounting groove can satisfy the following relationship: 2L2≤L1≤2W1; Wherein, L2 is the width of the second magnetic bridge along the extension direction of the arc-shaped mounting groove, L1 is the length of the magnetic barrier along the extension direction of the arc-shaped mounting groove, and W1 is the width of the magnetic barrier.

8. The motor rotor according to claim 3, characterized in that, In any one of the mounting slot groups, the number of the first arc-shaped mounting slots is two, and the number of the second arc-shaped mounting slots is one; The two first arc-shaped mounting slots are arranged at radial intervals along the rotor core; The second arc-shaped mounting groove is located on the side of the two arc-shaped mounting grooves near the edge of the rotor core.

9. The motor rotor according to claim 3, characterized in that, The magnetic barrier in the first arc-shaped mounting groove includes a non-magnetic structure formed of air, epoxy resin, or polyester fiber; The magnetic barrier in the second arc-shaped mounting groove includes a non-magnetic structure formed of epoxy resin or polyester fiber.

10. An electric motor, characterized in that, include: Motor rotor, motor stator, and motor housing; The motor rotor is selected from the motor rotor according to any one of claims 1 to 9, the motor stator is sleeved on the outside of the motor rotor, and the motor housing is sleeved on the outside of the motor stator.

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