Rotor for permanent magnet synchronous motor and permanent magnet synchronous motor
By designing V-shaped magnet slots in the rotor of a permanent magnet synchronous motor and connecting them with magnetic isolation holes, the magnetic field distribution is optimized, solving the problems of magnetic leakage and low magnet utilization in built-in permanent magnet synchronous motors, and achieving an increase in power density and efficiency without increasing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ZHUHAI LANDA COMPRESSOR
- Filing Date
- 2026-03-03
- Publication Date
- 2026-05-15
AI Technical Summary
The existing built-in permanent magnet synchronous motors have a simple rotor topology, which leads to large leakage flux between magnetic poles, low magnet utilization, difficulty in improving the power density and efficiency of the motor, and difficulty in cost control.
Design a rotor lamination with V-shaped magnet slots connected by magnetic isolation holes to form an enclosed structure, which optimizes magnetic field distribution and magnet utilization, reduces magnetic leakage, and enhances magnetic concentration effect.
It effectively reduces magnetic leakage between rotor poles, improves magnet utilization, and enhances the power density and efficiency of permanent magnet synchronous motors, while keeping costs under control.
Smart Images
Figure CN122052379A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of motor technology, and more specifically, to a rotor for a permanent magnet synchronous motor and a permanent magnet synchronous motor. Background Technology
[0002] There is a certain contradiction between improving motor efficiency and controlling motor cost. How to significantly improve motor efficiency while keeping costs constant or increasing them only slightly has always been a challenge in motor design improvement.
[0003] For built-in permanent magnet synchronous motors, effectively utilizing permanent magnet materials to design higher-performance motors is crucial for improving motor efficiency. However, the rotor topology of existing built-in permanent magnet synchronous motors is mostly simple and not reasonable enough, resulting in large leakage flux between magnetic poles and low utilization of magnets, making it difficult to improve the power density and efficiency of the motor. Summary of the Invention
[0004] The purpose of this application is to provide a rotor for a permanent magnet synchronous motor and a permanent magnet synchronous motor. The rotor for the permanent magnet synchronous motor can effectively reduce the leakage flux between the rotor poles and improve the magnetic concentration effect of the rotor, thereby improving the power density and efficiency of the permanent magnet synchronous motor, without excessively increasing the cost of the permanent magnet synchronous motor.
[0005] To achieve the above objectives, in a first aspect, this application provides a rotor for a permanent magnet synchronous motor, including rotor laminations, wherein the rotor laminations include a plurality of magnet placement slots arranged circumferentially, and the magnet placement slots include two first magnet slots and two second magnet slots; The two first magnet slots and the two second magnet slots are both arranged in a V-shape. The two first magnet slots and the two second magnet slots are arranged radially spaced along the rotor lamination, and the two sets of first magnet slots and second magnet slots located on the same side are connected by magnetic isolation holes.
[0006] In the implementation of the above technical solution, the rotor of the permanent magnet synchronous motor has two first magnet slots and two second magnet slots of the single magnet placement slot of the rotor lamination arranged in a V-shape and spaced apart radially along the rotor lamination. Moreover, the two sets of first magnet slots and second magnet slots located on the same side are connected by magnetic isolation holes to form an enclosed structure. In this way, magnetic leakage between the two first magnet slots and the two second magnet slots can be avoided, thereby effectively reducing magnetic leakage between rotor magnetic poles, improving the rotor's magnetic focusing effect, and making more effective use of magnets, thus improving the utilization rate of magnets. This can better improve the power density and efficiency of the permanent magnet synchronous motor, without excessively increasing the cost of the permanent magnet synchronous motor.
[0007] In a preferred embodiment of this application, the first magnet slot located on the same side is further away from the center of the rotor lamination than the second magnet slot; The included angle between the two first magnet slots is α, and the included angle between the two second magnet slots is β. The included angle α between the two first magnet slots is greater than the included angle β between the two second magnet slots, and 136°<α<160°, 110°<β<140°.
[0008] In the implementation of the above technical solution, the angle design of the included angle between the two first magnet slots and the included angle between the two second magnet slots can make the magnetic field generated by the magnet more evenly distributed in the air gap, reduce the content of magnetic field harmonics, thereby reducing torque pulsation, improving the smoothness of permanent magnet synchronous motor operation, reducing vibration noise, and also enhancing the magnetic circuit coupling between the stator and rotor of the permanent magnet synchronous motor, reducing magnetic circuit reluctance, improving the utilization rate of magnetic flux, increasing torque density, and thus better improving the efficiency of permanent magnet synchronous motor.
[0009] In a preferred embodiment of this application, the tops of the two ends of the first magnet slots that are far apart from each other protrude outward to form a convex angle, and the corresponding convex angle forms an obtuse angle with the top of the corresponding first magnet slot. 130° <150°.
[0010] In the implementation of the above technical solution, the angle design of the convex angle and the obtuse angle formed therein can optimize the direction of the magnetic circuit at the outer circle of the rotor, making it closer to the center of the rotor magnetic pole, and further improving the magnetization effect, which has a good effect on improving the electromagnetic torque of the permanent magnet synchronous motor.
[0011] In a preferred embodiment of this application, each of the two first magnet slots has a limiting protrusion on the bottom wall of the slot at the opposite end, and the limiting protrusion extends from the opposite end of the two first magnet slots toward the opposite end of the two first magnet slots.
[0012] In the implementation of the above technical solution, limiting protrusions are provided on the bottom walls of the two first magnet slots at their far ends. Correspondingly, limiting recesses are provided on the magnets placed in the two first magnet slots. When the magnet is placed in the two first magnet slots, the movement of the magnet is limited by the cooperation of the limiting protrusions and limiting recesses. This can greatly reduce the resonance between the magnet and the rotor core caused by the interaction between the armature magnetic field and the rotor magnetic field, improve the operating stability of the permanent magnet synchronous motor, and improve the performance and service life of the permanent magnet synchronous motor.
[0013] In a preferred embodiment of this application, the width of the first magnet slot is L, and the width of the second magnet slot is W, wherein the width L of the first magnet slot is greater than the width W of the second magnet slot, and by 0.5. <W / L0.9。
[0014] In the implementation of the above technical solution, the design of the width of the first magnet slot and the width of the second magnet slot can optimize the overall magnetic field efficiency, reduce the overall amount of magnets used, and reduce costs.
[0015] In a preferred embodiment of this application, the first magnet slot located on the same side is further away from the center of the rotor lamination than the second magnet slot; The two first magnet slots are connected at their close ends, and the two second magnet slots are spaced apart at their close ends. Both of the two second magnet slots extend toward the center of the rotor lamination at their close ends to form an extended protrusion.
[0016] In the implementation of the above technical solution, the two second magnet slots extend towards the middle of the rotor lamination at their close ends to form an extended protrusion, which forms a magnetic bridge structure. This design can avoid insufficient strength of the rotor core structure between the two first magnet slots and the two second magnet slots, improve the structural stability between the two first magnet slots and the two second magnet slots, and further improve the operating stability of the permanent magnet synchronous motor and the performance of the permanent magnet synchronous motor.
[0017] In a preferred embodiment of this application, a plurality of regularly distributed magnetic flux tidying grooves are provided between the two first magnet grooves and the two second magnet grooves.
[0018] In the implementation of the above technical solution, multiple regularly distributed magnetic flux tidying slots are set between the two first magnet slots and the two second magnet slots. This can optimize the magnetic path between the magnets placed in the second magnet slots and the magnets placed in the first magnet slots, thereby reducing rotor iron loss and further improving the efficiency of the permanent magnet synchronous motor.
[0019] In a preferred embodiment of this application, the plurality of magnetic flux conditioning slots include a first magnetic flux conditioning slot, two second magnetic flux conditioning slots, two third magnetic flux conditioning slots, and two fourth magnetic flux conditioning slots. The first magnetic flux sorting groove is located at the middle position between the two first magnet grooves and the two second magnet grooves, and extends radially along the rotor lamination; Two second magnetic flux sorting slots, two third magnetic flux sorting slots, and two fourth magnetic flux sorting slots are symmetrically arranged on both sides of the first magnetic flux sorting slot. The second, third, and fourth magnetic flux sorting slots located on the same side are arranged sequentially from the inside to the outside relative to the first magnetic flux sorting slot.
[0020] In the implementation of the above technical solution, the arrangement of the first magnetic flux sorting slot, two second magnetic flux sorting slots, two third magnetic flux sorting slots and two fourth magnetic flux sorting slots can better optimize the magnetic path between the magnet placed in the second magnetic slot and the magnet placed in the first magnetic slot, further reduce rotor iron loss, and improve the efficiency of the permanent magnet synchronous motor.
[0021] In a preferred embodiment of this application, the included angle formed between the second magnetic flux conditioning groove and the first magnetic flux conditioning groove is . 16° <22°; The third magnetic flux sorting groove is arranged parallel to the second magnetic flux sorting groove; The angle formed between the fourth magnetic flux conditioning groove and the third magnetic flux conditioning groove is 39.5° <43.5°.
[0022] In the implementation of the above technical solution, the angle design of the second, third, and fourth magnetic flux tidying slots can optimize the magnetic flux path between the magnet placed in the second magnetic slot and the magnet placed in the first magnetic slot, avoid excessive concentration of magnetic flux in the iron core, reduce hysteresis loss and eddy current loss caused by magnetic flux disorder inside the iron core, reduce motor heating, better guide the magnetic flux to pass through the gap between the magnet placement slot and the magnet more evenly, reduce magnetic leakage, and more directly and efficiently improve the efficiency of the permanent magnet synchronous motor.
[0023] Secondly, this application provides a permanent magnet synchronous motor, including the rotor for a permanent magnet synchronous motor described above.
[0024] This application discloses a rotor for a permanent magnet synchronous motor and a permanent magnet synchronous motor, which, compared with the prior art, have at least the following advantages: The rotor for a permanent magnet synchronous motor disclosed in this application includes rotor laminations. Each rotor lamination includes multiple circumferentially distributed magnet placement slots, comprising two first magnet slots and two second magnet slots. Both the first and second magnet slots are V-shaped and radially spaced along the rotor laminations. Furthermore, the two sets of first and second magnet slots located on the same side are connected by magnetic isolation holes, forming an enclosed structure. This avoids magnetic leakage between the two first and second magnet slots, effectively reducing magnetic leakage between rotor poles, improving the rotor's magnetization effect, and allowing for more efficient utilization of the magnets. This increases the magnet utilization rate and thus improves the power density and efficiency of the permanent magnet synchronous motor without significantly increasing its cost.
[0025] The permanent magnet synchronous motor of this application adopts the rotor used in the permanent magnet synchronous motor described above, which can effectively reduce the leakage magnetic field between the rotor magnetic poles, improve the magnetic concentration effect of the rotor, and make more effective use of the magnet, thereby improving the utilization rate of the magnet. This can improve the power density and efficiency of the permanent magnet synchronous motor, without excessively increasing the cost of the permanent magnet synchronous motor. Attached Figure Description
[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0027] Figure 1 This is a schematic diagram of the rotor laminations for a permanent magnet synchronous motor provided in an embodiment of this application; Figure 2 yes Figure 1 An enlarged schematic diagram of the local structure; Figure 3 This is a schematic diagram of the rotor laminations of a permanent magnet synchronous motor provided in this application embodiment, in which magnets are placed; Figure 4 yes Figure 3 An enlarged schematic diagram of the local structure; Figure 5 yes Figure 3 The local structure is shown in an enlarged schematic diagram of the magnetic circuit.
[0028] Reference numerals: 11, first magnet groove; 111, convex corner; 112, limiting protrusion; 12, second magnet groove; 121, extending protrusion; 13, magnetic isolation hole; 14, first magnetic flux tidying groove; 15, second magnetic flux tidying groove; 16, third magnetic flux tidying groove; 17, fourth magnetic flux tidying groove. Detailed Implementation
[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0030] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.
[0031] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.
[0032] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or a point connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.
[0033] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.
[0034] For built-in permanent magnet synchronous motors, effectively utilizing permanent magnet materials to design higher-performance motors is crucial for improving motor efficiency. However, the rotor topology of existing built-in permanent magnet synchronous motors is mostly simple and not reasonable enough, resulting in large leakage flux between magnetic poles and low utilization of magnets, making it difficult to improve the power density and efficiency of the motor.
[0035] To address the problems in the prior art, this application provides a rotor for a permanent magnet synchronous motor and a permanent magnet synchronous motor. The rotor for the permanent magnet synchronous motor can effectively reduce magnetic leakage between rotor poles and improve the magnetic focusing effect of the rotor, thereby improving the power density and efficiency of the permanent magnet synchronous motor without significantly increasing the cost of the permanent magnet synchronous motor.
[0036] Example 1 See Figures 1 to 4 ,in, Figure 1 and Figure 2 The magnet placement slot in the middle was not filled with magnets. Figure 3 and Figure 4 The magnet placement slot contains magnets.
[0037] The rotor for a permanent magnet synchronous motor according to the present application embodiment includes a rotor lamination, the rotor lamination includes a plurality of magnet placement slots arranged circumferentially, the magnet placement slots include two first magnet slots 11 and two second magnet slots 12; The two first magnet slots 11 and the two second magnet slots 12 are all arranged in a V-shape. The two first magnet slots 11 and the two second magnet slots 12 are arranged radially apart along the rotor laminations, and the two sets of first magnet slots 11 and second magnet slots 12 located on the same side are connected through magnetic isolation holes 13.
[0038] The rotor for a permanent magnet synchronous motor according to the embodiments of this application is particularly suitable for use in an embedded permanent magnet synchronous motor.
[0039] In this embodiment, the rotor lamination includes six magnet placement slots arranged circumferentially. It can be understood that in other embodiments, the number of magnet placement slots arranged circumferentially may be other, for example, there may be eight magnet placement slots arranged circumferentially.
[0040] In this embodiment, each magnet placement slot includes two first magnet slots 11 and two second magnet slots 12. Both the first magnet slots 11 and the second magnet slots 12 are used to place magnets. The first magnet slots 11 and 12 located on the same side form a set of first magnet slots 11 and second magnet slots 12. That is, each magnet placement slot has two sets of first magnet slots 11 and second magnet slots 12. The first magnet slots 11 on the same side are further away from the center of the rotor lamination than the second magnet slots 12. It is understood that in other embodiments, the first magnet slots 11 on the same side may also be closer to the center of the rotor lamination than the second magnet slots 12. In this embodiment, the first magnet slots 11 on the same side are further away from the center of the rotor lamination than the second magnet slots 12. The rotor laminations of a permanent magnet synchronous motor are described below as an example, with the two magnet slots 12 located away from the center of the rotor laminations. In this embodiment, the first magnet slot 11 and the second magnet slot 12 located on the same side are connected by a magnetic isolation hole 13. Specifically, the first magnet slot 11, the second magnet slot 12, and the magnetic isolation hole 13 all penetrate the rotor laminations along the thickness direction. For example, the rotor laminations are made of silicon steel. Since the permeability of silicon steel is usually thousands of times that of air, the magnetic circuit is conducted along the fastest path. The magnetic isolation hole 13 can prevent the formation of a loop between the magnets placed in the first magnet slot 11 and the magnets placed in the second magnet slot 12, thereby reducing magnetic leakage.
[0041] In the rotor of the permanent magnet synchronous motor of this application embodiment, the two first magnet slots 11 and two second magnet slots 12 of the single magnet placement slot of the rotor lamination are all arranged in a V-shape and are spaced apart along the radial direction of the rotor lamination. Moreover, the two sets of first magnet slots 11 and second magnet slots 12 located on the same side are connected by magnetic isolation holes 13 to form an enclosed structure. In this way, magnetic leakage between the two first magnet slots 11 and the two second magnet slots 12 can be avoided, thereby effectively reducing magnetic leakage between rotor magnetic poles, improving the magnetic concentration effect of the rotor, and making more effective use of the magnets, thereby improving the utilization rate of the magnets. This can better improve the power density and efficiency of the permanent magnet synchronous motor, and without excessively increasing the cost of the permanent magnet synchronous motor.
[0042] Preferably, in this embodiment, the included angle between the two first magnet slots 11 is α, and the included angle between the two second magnet slots 12 is β. The included angle α between the two first magnet slots 11 is greater than the included angle β between the two second magnet slots 12, and 136°<α<160°, 110°<β<140°.
[0043] In the above structure, the angle design of the included angle between the two first magnet slots 11 and the included angle between the two second magnet slots 12 can make the magnetic field generated by the magnet more evenly distributed in the air gap, reduce the content of magnetic field harmonics, thereby reducing torque pulsation, improving the smoothness of permanent magnet synchronous motor operation, reducing vibration noise, and also enhancing the magnetic circuit coupling between the stator and rotor of permanent magnet synchronous motor, reducing magnetic circuit reluctance, improving the utilization rate of magnetic flux, increasing torque density, and thus better improving the efficiency of permanent magnet synchronous motor.
[0044] It should be noted that in other embodiments, the included angle α formed by the two first magnet slots 11 and the included angle β formed by the two second magnet slots 12 can also be other angles. Here, we will not give examples of other angles that can be used for the included angle α formed by the two first magnet slots 11 and the included angle β formed by the two second magnet slots 12.
[0045] Preferably, in this embodiment, the width of the first magnet slot 11 is L, and the width of the second magnet slot 12 is W, wherein the width L of the first magnet slot 11 is greater than the width W of the second magnet slot 12, and the difference is 0.5. <W / L0.9。
[0046] In the above structure, the design of the width of the first magnet slot 11 and the width of the second magnet slot 12 can optimize the overall magnetic field efficiency, reduce the overall amount of magnets used, and reduce costs.
[0047] It should be noted that in other embodiments, the width L of the first magnet groove 11 and the width W of the second magnet groove 12 may also adopt other size ratios. For example, the width L of the first magnet groove 11 may also be equal to the width W of the second magnet groove 12.
[0048] Example 2 See Figures 1 to 4 Based on the above embodiment one, the difference between this embodiment and embodiment one is that, in this embodiment, the rotor for the permanent magnet synchronous motor has two first magnet slots 11 whose tops at the ends that are far apart from each other protruding outward to form a convex angle 111, and the corresponding convex angle 111 forms an obtuse angle with the top of the corresponding first magnet slot 11. 130° <150°.
[0049] In the above structure, the angle design of the convex angle 111 and the obtuse angle formed therein can optimize the direction of the magnetic circuit at the outer circle of the rotor, and bring it closer to the center of the rotor magnetic pole, thereby further improving the magnetization effect and having a good effect on improving the electromagnetic torque of the permanent magnet synchronous motor.
[0050] Preferably, in this embodiment, each of the two first magnet slots 11 has a limiting protrusion 112 on the bottom wall of the slot at the opposite end. The limiting protrusion 112 extends from the opposite end of the two first magnet slots 11 toward the opposite end of the two first magnet slots 11.
[0051] In this embodiment, the end of the limiting protrusion 112 is arc-shaped. It can be understood that in other embodiments, the end of the limiting protrusion 112 may also be other shapes. For example, the end of the limiting protrusion 112 may also be straight, that is, the limiting protrusion 112 is rectangular in shape.
[0052] In the above structure, a limiting protrusion 112 is provided on the bottom wall of the two first magnet slots 11 at the ends that are far apart from each other. Correspondingly, a limiting recess is provided on the magnet placed in the two first magnet slots 11. When the magnet is placed in the two first magnet slots 11, the movement of the magnet is limited by the cooperation of the limiting protrusion 112 and the limiting recess. This can greatly reduce the resonance between the magnet and the rotor core caused by the interaction between the armature magnetic field and the rotor magnetic field, improve the operating stability of the permanent magnet synchronous motor, and improve the performance and service life of the permanent magnet synchronous motor.
[0053] Example 3 See Figures 1 to 4 Based on the above embodiment one or embodiment two, the difference between this embodiment and embodiment one or embodiment two is that, in this embodiment, the rotor for the permanent magnet synchronous motor has two first magnet slots 11 connected at one end close to each other, two second magnet slots 12 with a gap at one end close to each other, and both second magnet slots 12 extend towards the middle of the rotor lamination at one end close to each other to form an extended protrusion 121.
[0054] In the above structure, the two second magnet slots 12 extend towards the middle of the rotor lamination at their close ends to form an extended protrusion 121, which forms a magnetic bridge structure. This design can avoid insufficient strength of the rotor core structure between the two first magnet slots 11 and the two second magnet slots 12, improve the structural stability between the two first magnet slots 11 and the two second magnet slots 12, and further improve the operating stability of the permanent magnet synchronous motor and improve the performance of the permanent magnet synchronous motor.
[0055] Preferably, in this embodiment, the two second magnet slots 12 form an included angle between the extended protrusions 121 that extend toward the center of the rotor lamination at their adjacent ends. 20° At an angle of less than 60°, the structural stability between the two first magnet slots 11 and the two second magnet slots 12 can be better improved by extending the setting of the protrusion 121.
[0056] Example 4 See Figures 1 to 5 Based on any of the above embodiments one to three, the difference between this embodiment and any of the above embodiments one to three is that, in this embodiment, the rotor for the permanent magnet synchronous motor has a plurality of regularly distributed magnetic flux sorting slots between the two first magnet slots 11 and the two second magnet slots 12.
[0057] In the above structure, multiple regularly distributed magnetic flux tidying slots are set between the two first magnet slots 11 and the two second magnet slots 12. This can optimize the magnetic circuit between the magnet placed in the second magnet slot 12 and the magnet placed in the first magnet slot 11, thereby reducing rotor iron loss and further improving the efficiency of the permanent magnet synchronous motor.
[0058] Preferably, in this embodiment, the plurality of magnetic flux conditioning slots include a first magnetic flux conditioning slot 14, two second magnetic flux conditioning slots 15, two third magnetic flux conditioning slots 16, and two fourth magnetic flux conditioning slots 17. The first magnetic flux sorting groove 14 is located at the middle position between the two first magnet grooves 11 and the two second magnet grooves 12, and extends radially along the rotor lamination; Two second magnetic flux sorting slots 15, two third magnetic flux sorting slots 16 and two fourth magnetic flux sorting slots 17 are symmetrically arranged on both sides of the first magnetic flux sorting slot 14. The second magnetic flux sorting slots 15, third magnetic flux sorting slots 16 and fourth magnetic flux sorting slots 17 located on the same side are arranged from the inside to the outside relative to the first magnetic flux sorting slot 14.
[0059] In the above structure, the arrangement of the first magnetic flux tidying slot 14, two second magnetic flux tidying slots 15, two third magnetic flux tidying slots 16 and two fourth magnetic flux tidying slots 17 can better optimize the magnetic path between the magnet placed in the second magnetic slot 12 and the magnet placed in the first magnetic slot 11, further reduce rotor iron loss, and improve the efficiency of the permanent magnet synchronous motor.
[0060] It should be noted that in other embodiments, the number of magnetic flux sorting slots can be other than the number of magnetic flux sorting slots. For example, the number of magnetic flux sorting slots can be reduced by removing two fourth magnetic flux sorting slots 17 from the above seven magnetic flux sorting slots. Here, the possible number of other magnetic flux sorting slots will not be listed.
[0061] Preferably, in this embodiment, the included angle formed between the second magnetic flux conditioning groove 15 and the first magnetic flux conditioning groove 14 is . 16° <22°; The third magnetic flux sorting groove 16 is arranged parallel to the second magnetic flux sorting groove 15; The angle formed between the fourth magnetic flux sorting groove 17 and the third magnetic flux sorting groove 16 is 39.5° <43.5°.
[0062] In the above structure, the angle design of the second magnetic flux accumulator slot 15, the third magnetic flux accumulator slot 16 and the fourth magnetic flux accumulator slot 17 can optimize the magnetic flux path between the magnet placed in the second magnetic flux slot 12 and the magnet placed in the first magnetic flux slot 11, avoid excessive concentration of magnetic flux in the iron core, reduce hysteresis loss and eddy current loss caused by magnetic flux disorder inside the iron core, reduce motor heating, better guide magnetic flux to pass through the gap between the magnet placement slot and the magnet more evenly, reduce magnetic leakage, and more directly and efficiently improve the efficiency of the permanent magnet synchronous motor.
[0063] It should be noted that in other embodiments, the angle setting relationship between the multiple magnetic flux sorting slots can also be other angle setting relationships, and no examples of other angle setting relationships that can be used between the multiple magnetic flux sorting slots will be given here.
[0064] Example 5 See Figures 1 to 5 This application provides a permanent magnet synchronous motor, including a rotor for a permanent magnet synchronous motor from any of the embodiments one to four described above.
[0065] In this embodiment, the permanent magnet synchronous motor can be an internal permanent magnet synchronous motor.
[0066] The permanent magnet synchronous motor of this application adopts the rotor of any one of the embodiments of the above embodiments one to four. It can effectively reduce the leakage magnetic field between the rotor magnetic poles, improve the magnetic concentration effect of the rotor, and make more effective use of the magnet, thereby improving the utilization rate of the magnet. In this way, it can better improve the power density and efficiency of the permanent magnet synchronous motor, and will not increase the cost of the permanent magnet synchronous motor too much.
[0067] In all the above embodiments, "large" and "small" are relative terms, "more" and "less" are relative terms, and "upper" and "lower" are relative terms. The embodiments of this application will not elaborate further on the expression of such relative terms.
[0068] It should be understood that phrases such as "in one embodiment," "in this embodiment," "in this application embodiment," or "as an optional implementation" throughout the specification mean that a specific feature, structure, or characteristic related to an embodiment is included in at least one embodiment of this application. Therefore, phrases such as "in one embodiment," "in this embodiment," "in this application embodiment," or "as an optional implementation" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Those skilled in the art should also understand that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily essential to this application.
[0069] In the various embodiments of this application, it should be understood that the sequence number of each process does not necessarily imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.
[0070] The above description is merely a specific embodiment 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 protection of the claims.
Claims
1. A rotor for a permanent magnet synchronous motor, characterized in that, The rotor lamination includes a plurality of magnet placement slots arranged circumferentially, the magnet placement slots including two first magnet slots and two second magnet slots; The two first magnet slots and the two second magnet slots are both arranged in a V-shape. The two first magnet slots and the two second magnet slots are arranged radially spaced along the rotor lamination, and the two sets of first magnet slots and second magnet slots located on the same side are connected by magnetic isolation holes.
2. The rotor for a permanent magnet synchronous motor according to claim 1, characterized in that, The first magnet slot, located on the same side, is further away from the center of the rotor lamination than the second magnet slot; The included angle between the two first magnet slots is α, and the included angle between the two second magnet slots is β. The included angle α between the two first magnet slots is greater than the included angle β between the two second magnet slots, and 136°<α<160°, 110°<β<140°.
3. The rotor for a permanent magnet synchronous motor according to claim 1, characterized in that, The tops of the two first magnet slots at their opposite ends both protrude outwards to form a convex angle, and the corresponding convex angle forms an obtuse angle with the top of the corresponding first magnet slot. 130° <150°.
4. The rotor for a permanent magnet synchronous motor according to claim 1, characterized in that, Each of the two first magnet slots has a limiting protrusion on the bottom wall of the slot at the opposite end. The limiting protrusion extends from the opposite end of the two first magnet slots toward the opposite end of the two first magnet slots.
5. The rotor for a permanent magnet synchronous motor according to claim 1, characterized in that, The width of the first magnet slot is L, and the width of the second magnet slot is W, wherein the width L of the first magnet slot is greater than the width W of the second magnet slot, and the difference is 0.
5. <W / L0.9。 6. The rotor for a permanent magnet synchronous motor according to any one of claims 1-5, characterized in that, The first magnet slot, located on the same side, is further away from the center of the rotor lamination than the second magnet slot; The two first magnet slots are connected at their close ends, and the two second magnet slots are spaced apart at their close ends. Both of the two second magnet slots extend toward the center of the rotor lamination at their close ends to form an extended protrusion.
7. The rotor for a permanent magnet synchronous motor according to any one of claims 1-5, characterized in that, A plurality of regularly distributed magnetic flux sorting slots are provided between the two first magnet slots and the two second magnet slots.
8. The rotor for a permanent magnet synchronous motor according to claim 7, characterized in that, The plurality of magnetic flux conditioning slots include a first magnetic flux conditioning slot, two second magnetic flux conditioning slots, two third magnetic flux conditioning slots, and two fourth magnetic flux conditioning slots. The first magnetic flux sorting groove is located at the middle position between the two first magnet grooves and the two second magnet grooves, and extends radially along the rotor lamination; Two second magnetic flux sorting slots, two third magnetic flux sorting slots, and two fourth magnetic flux sorting slots are symmetrically arranged on both sides of the first magnetic flux sorting slot. The second, third, and fourth magnetic flux sorting slots located on the same side are arranged sequentially from the inside to the outside relative to the first magnetic flux sorting slot.
9. The rotor for a permanent magnet synchronous motor according to claim 8, characterized in that, The angle formed between the second magnetic flux conditioning groove and the first magnetic flux conditioning groove is 16° <22°; The third magnetic flux sorting groove is arranged parallel to the second magnetic flux sorting groove; The angle formed between the fourth magnetic flux conditioning groove and the third magnetic flux conditioning groove is 39.5° <43.5°.
10. A permanent magnet synchronous motor, characterized in that, Includes the rotor for a permanent magnet synchronous motor as described in any one of claims 1-9.