Rotor Structure and Permanent Magnet Motor

Abstract

The present invention belongs to the technical field of drive motors, and specifically relates to a rotor structure and a permanent magnet motor. The rotor structure includes a rotor core and a plurality of magnetic pole structures arranged circumferentially along the rotor core. Each magnetic pole structure includes: a first magnet loading portion and a second magnet loading portion disposed between the first magnet loading portion and the central axis of the rotor core; the second magnet loading portion includes two first magnet mounting slots symmetrically relative to the magnetic pole centerline, the angle between the opening direction of the first slot portion and the magnetic pole centerline being greater than the angle between the opening direction of the second slot portion and the magnetic pole centerline; a first permanent magnet is disposed in each of the first slot portion and the second slot portion, and each first permanent magnet has its end portion near the connecting portion and one side near the first magnet loading portion suspended. The rotor structure and permanent magnet motor of the present invention can prevent local demagnetization of the permanent magnets and ensure the service life of the permanent magnets.

Description

Technical Field

[0001] The present application belongs to the technical field of drive motors, and specifically relates to a rotor structure and a permanent magnet motor. Background Art

[0002] Traditional cars consume large amounts of oil and emit a large amount of exhaust gas, resulting in significant energy consumption and serious environmental pollution. With increasing environmental protection and energy consumption requirements, new energy vehicles will become the future direction of automotive development.

[0003] The main drive motors for new energy vehicles feature high torque density, high power density, and a wide range of high-efficiency speeds. Currently, they are primarily built-in permanent magnet synchronous motors. The basic principle is to increase motor torque density by optimizing the ratio of permanent magnet torque to reluctance torque.

[0004] However, during use, the existing permanent magnet synchronous motor may experience demagnetization of the permanent magnets. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a rotor structure and a permanent magnet motor, which aim to at least to some extent solve the technical problem of permanent magnet demagnetization during use of the permanent magnet synchronous motor.

[0006] The technical solution of the present invention is:

[0007] A rotor structure, which is special in that it includes a rotor core and a plurality of magnetic pole structures arranged along the circumference of the rotor core, each of the magnetic pole structures includes: a first magnet loading portion and a second magnet loading portion arranged between the first magnet loading portion and the central axis of the rotor core; the second magnet loading portion includes two first magnet mounting slots symmetrical with respect to the magnetic pole center line, each of the two first magnet mounting slots includes a first slot body portion close to the magnetic pole center line, a second slot body portion away from the magnetic pole center line and a connecting portion connecting the first slot body portion and the second slot body portion; the angle between the opening direction of the first slot body portion and the magnetic pole center line is greater than the angle between the opening direction of the second slot body portion and the magnetic pole center line, a first permanent magnet is arranged in the first slot body portion and the second slot body portion, and the end of each first permanent magnet close to the connecting portion and the side close to the first magnet loading portion are both suspended.

[0008] In some embodiments, the distance from the middle of the connecting portion to the first magnet loading portion is smaller than the distance between the two ends of the connecting portion.

[0009] In some embodiments, the distance between the middle portion and the end portion of the connecting portion and the first magnet filling portion gradually increases.

[0010] In some embodiments, the thickness of the first permanent magnet in the first slot portion is greater than or equal to the thickness of the first permanent magnet in the second slot portion.

[0011] As a preferred embodiment of the present invention, the magnetic pole structure further comprises: a first magnetic barrier connected to an end portion of the first slot portion close to the magnetic pole centerline;

[0012] The end portion of the first permanent magnet close to the first magnetic barrier and one side close to the first magnet filling portion is suspended.

[0013] In some embodiments, the first magnetic barrier includes a first slot and a second slot;

[0014] The first slot is connected to an end portion of the first slot body portion close to the center line of the magnetic pole;

[0015] The second groove is communicated with the first groove.

[0016] In some embodiments, the first slot first shrinks and then expands in a direction from the first magnet mounting slot to the magnetic pole centerline;

[0017] The second slot first shrinks and then expands along the radial direction of the rotor core.

[0018] In some embodiments, the magnetic pole structure further includes: a first magnetic flux barrier connected to an end of the second slot portion away from the magnetic pole centerline.

[0019] In some embodiments, the width of the first flux barrier gradually decreases from an end portion connected to the second slot portion to an end portion away from the second slot portion.

[0020] In some embodiments, the first magnet loading portion includes two second magnet mounting slots that are symmetrical with respect to the magnetic pole center line;

[0021] A second permanent magnet is disposed in each of the two second magnet installation grooves;

[0022] An end portion of each of the second permanent magnets close to the magnetic pole centerline and away from the second magnet filling portion is suspended.

[0023] In some embodiments, the first permanent magnet and the second permanent magnet include two or more permanent magnets of different specifications.

[0024] Based on the same inventive concept, the present invention also provides a permanent magnet motor including the above-mentioned rotor structure.

[0025] The beneficial effects of the present invention include at least:

[0026] First, since the rotor structure includes a rotor core and multiple magnetic pole structures arranged circumferentially along the rotor core, each magnetic pole structure includes: a first magnet filling portion and a second magnet filling portion arranged between the first magnet filling portion and the central axis of the rotor core. Therefore, the power density of the motor is effectively improved through the two-layer structure of the first magnet filling portion and the second magnet filling portion.

[0027] In addition, since the second magnet loading portion includes two first magnet mounting grooves that are symmetrical relative to the magnetic pole center line, each of the two first magnet mounting grooves includes a first groove body portion close to the magnetic pole center line, a second groove body portion away from the magnetic pole center line, and a connecting portion connecting the first groove body portion and the second groove body portion, the angle between the opening direction of the first groove body portion and the magnetic pole center line is greater than the angle between the opening direction of the second groove body portion and the magnetic pole center line, and first permanent magnets are arranged in the first groove body portion and the second groove body portion. Therefore, when observed axially, the first magnet mounting groove has a curved point broken line shape, which can prevent the first permanent magnet from excessively leaving the first magnet loading portion near the magnetic pole center line, and can moderately maintain the distance between the first permanent magnet and the first magnet loading portion while avoiding magnetic saturation, and can further improve the magnet torque.

[0028] Finally, since the end of each first permanent magnet close to the connecting portion and one side close to the first magnet filling portion is suspended, one side of the end of the first permanent magnet can be prevented from contacting the rotor core, thereby avoiding local demagnetization of the permanent magnet and ensuring the service life of the permanent magnet. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, a brief introduction will be given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0030] Figure 1 Schematic diagram of the rotor structure of this embodiment;

[0031] Figure 2 for Figure 1 A schematic structural diagram of a rotor core of the rotor structure shown;

[0032] Figure 3 for Figure 1 A schematic diagram of the arrangement of the second magnet loading portion of the rotor structure shown;

[0033] Figure 4 for Figure 2 An enlarged schematic diagram of the rotor structure A is shown;

[0034] Figure 5 for Figure 1 Schematic diagram of the arrangement of the air slots of the rotor structure shown;

[0035] Figure 6 for Figure 1 A schematic diagram of the arrangement of the first magnet loading portion of the rotor structure shown;

[0036] Figure 7 for Figure 1 Schematic diagram of the arrangement of the first auxiliary arc slot and the second auxiliary arc slot of the rotor structure shown;

[0037] Figure 8 for Figure 7 A schematic diagram of the arrangement of the first auxiliary arc-shaped slots of the rotor structure shown;

[0038] Figure 9 for Figure 7 A schematic diagram of the arrangement of the second auxiliary arc-shaped slots of the rotor structure shown;

[0039] Figure 10 Schematic diagram of the structure of the permanent magnet motor of this embodiment.

[0040] In the attached figure:

[0041] Second magnet loading portion 1, first magnet mounting slot 101, connecting portion 102, second positioning slot 103, first positioning slot 104, first flux barrier 105, third positioning slot 106, first slot portion 1011, second slot portion 1012;

[0042] Magnetic pole centerline 2;

[0043] A first permanent magnet 3;

[0044] A second permanent magnet 4;

[0045] First magnetic barrier 5, first slot 501, second slot 502;

[0046] Air tank 6;

[0047] First magnet loading portion 7, second magnet mounting slot 701, fourth positioning slot 7011;

[0048] Rotor core 8, first auxiliary arc slot 801, second auxiliary arc slot 802;

[0049] Second magnetic barrier 9;

[0050] Second magnetic flux barrier 10 , fifth positioning groove 1001 . DETAILED DESCRIPTION

[0051] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0052] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative position relationship and movement status of various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0053] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0054] In addition, in the present invention, descriptions such as "first" and "second" are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0055] The present application is described below with reference to specific embodiments and with reference to the accompanying drawings:

[0056] The rotor structure and permanent magnet motor provided in this embodiment are intended to at least to some extent solve the technical problem of permanent magnet demagnetization occurring during use of a permanent magnet synchronous motor.

[0057] Figure 1 is a schematic structural diagram of the rotor structure of this embodiment, Figure 2 for Figure 1 The schematic diagram of the rotor core structure of the rotor structure shown. Figure 1 and Figure 2 The rotor structure of this embodiment includes a rotor core 8 and a plurality of magnetic pole structures. The plurality of magnetic pole structures can be circumferentially arranged on the circumferential surface of the rotor core 8.

[0058] Figure 3 for Figure 1 The schematic diagram of the arrangement of the second magnet filling part of the rotor structure shown in FIG. Figure 1 and Figure 3 Each magnetic pole structure includes: a first magnet loading portion 7 and a second magnet loading portion 1. In this embodiment, the second magnet loading portion 1 is arranged between the first magnet loading portion 7 and the central axis of the rotor core 8, that is, the second magnet loading portion 1 is closer to the central axis of the rotor core 8 than the first magnet loading portion 7. Since the second magnet loading portion 1 is arranged between the first magnet loading portion 7 and the central axis of the rotor core 8, the first magnet loading portion 7 and the second magnet loading portion 1 form a two-layer structure, which can effectively improve the power density of the motor.

[0059] Combine Figure 3 In this embodiment, the second magnet loading portion 1 includes two first magnet mounting grooves 101. The two first magnet mounting grooves 101 of this embodiment are symmetrically arranged relative to the magnetic pole center line 2. Each first magnet mounting groove 101 of this embodiment includes a connecting portion 102, a first groove portion 1011 and a second groove portion 1012, wherein: the first groove portion 1011 is close to the magnetic pole center line 2, and the second groove portion 1012 is far away from the magnetic pole center line 2, that is, the first groove portion 1011 is arranged between the second groove portion 1012 and the magnetic pole center line 2, and the connecting portion 102 connects the first groove portion 1011 and the second groove portion 1012. In addition, the angle between the opening direction of the first groove portion 1011 and the magnetic pole center line 2 is greater than the angle between the opening direction of the second groove portion 1012 and the magnetic pole center line 2, that is, the first groove portion 1011 and the second groove portion 1012 form a V shape. Furthermore, the first permanent magnet 3 is disposed in both the first slot portion 1011 and the second slot portion 1012. Therefore, when viewed axially, the first magnet mounting slot 101 has a curved broken line shape, which prevents the first permanent magnet 3 from excessively moving away from the first magnet loading portion 7 near the magnetic pole centerline 2. This allows for a moderate distance between the first permanent magnet 3 and the first magnet loading portion 7 while avoiding magnetic saturation, thereby further improving the magnet torque.

[0060] Combine Figure 1 as well as Figure 3 In this embodiment, the end of each first permanent magnet 3 near the connecting portion 102 and one side near the first magnet loading portion 7 is suspended, forming a suspended portion. This suspended portion is located at the opening of the V-shape. This prevents one side of the end of the first permanent magnet 3 from contacting the rotor core 8, preventing local demagnetization of the permanent magnet and ensuring the service life of the permanent magnet.

[0061] Furthermore, because the angle between the opening direction of the first slot portion 1011 and the magnetic pole centerline 2 is greater than the angle between the opening direction of the second slot portion 1012 and the magnetic pole centerline 2, the localized concentration of the main magnetic flux and the magnetic flux can be alleviated, magnetic saturation can be prevented, leakage flux can be reduced, and effective magnetic flux can be increased. At the same time, the curvature of the magnet mounting slot 101 can prevent the first permanent magnet 3 from excessively moving away from the first magnet loading portion 7 near the magnetic pole centerline 2. In other words, the rotor structure of this embodiment can maintain a moderate distance between the first permanent magnet 3 and the first magnet loading portion 7 while avoiding magnetic saturation, further improving the magnet torque.

[0062] In actual implementation, a portion of the main magnetic flux flowing from the teeth into the rotor flows in a roughly circumferential direction along the magnetic path formed between the second magnet loading portion 1 and the first magnet loading portion 7. On the other hand, the magnetic flux flows along a path such as connecting the first permanent magnet 3 and the second permanent magnet 4 in the first magnet loading portion 7. This magnetic flux not only flows in a roughly radial direction, but also flows in a roughly circumferential direction. For example, in combination with Figure 1 , the magnetic flux output from the first permanent magnet 3 on the right side of the magnetic pole center line 2 advances in a roughly circumferential direction not only toward the first permanent magnet in the second slot portion 1012 which is also on the right side of the magnetic pole center line 2, but also toward the first permanent magnet on the left side of the magnetic pole center line 2. In this way, the magnetic flux flowing in the circumferential direction increases as it approaches the magnetic pole center. As a result, near the magnetic pole center, the main magnetic flux and the magnetic flux are both parallel in the circumferential direction, and the magnetic flux density tends to increase. When the magnetic flux density is excessively increased and saturated, the reluctance torque and the magnetic torque decrease, and the output torque of the permanent magnet motor decreases. In this embodiment, in order to avoid such magnetic saturation, the width of the magnetic circuit is increased as it approaches the magnetic pole center where the magnetic flux tends to concentrate.

[0063] If the sole purpose is to increase the magnetic path width as it approaches the magnetic pole center, it is also possible to design the first magnet mounting slot 101 straight without being curved. However, if the first magnet mounting slot 101 is designed to be straight, the magnetic path width near the magnetic pole center becomes excessively large, reducing the effective magnetic flux. That is, to obtain magnetic torque, the magnetic flux output from one first permanent magnet 3 or second permanent magnet 4 within the first magnet loading section 7 must be directed toward other first permanent magnets 3 or second permanent magnets 4 within the first magnet loading section 7. However, when the distance between the permanent magnets is excessively large, the magnetic flux output from one first permanent magnet 3 or second permanent magnet 4 within the first magnet loading section 7 tends to become leakage flux, returning to the first permanent magnet 3 or second permanent magnet 4 within the first magnet loading section 7 rather than toward other first permanent magnets 3 or second permanent magnets 4 within the first magnet loading section 7. In this embodiment, to reduce this leakage flux and increase the effective magnetic flux, the magnet mounting slot 1 is curved midway. In other words, the angle between the opening direction of the first slot portion 1011 and the magnetic pole centerline 2 is greater than the angle between the opening direction of the second slot portion 1012 and the magnetic pole centerline 2. By setting it as the above structure, it is possible to prevent the first permanent magnet 3 from being excessively separated from the second permanent magnet 4 in the first magnet loading portion 7 near the magnetic pole center. Moreover, as a result, while avoiding magnetic saturation, the distance between the first permanent magnet 3 and the second permanent magnet 4 in the first magnet loading portion 7 can be appropriately maintained, which can further improve the magnet torque.

[0064] In this embodiment, the first permanent magnet 3 can be disposed in the first slot portion 1011 and the second slot portion 1012 by resin bonding. At the same time, the first permanent magnet 3 can be made of a high remanence rare earth permanent magnet material.

[0065] In this embodiment, the distance from the middle of the connecting portion 102 to the first magnet loading portion 7 is smaller than the distance from the ends of the connecting portion 102 to the first magnet loading portion 7. This ensures that the end of the first permanent magnet 3 close to the connecting portion 102 and the side close to the first magnet loading portion 7 is suspended, thereby ensuring magnetic performance.

[0066] Figure 4 for Figure 1 The enlarged schematic diagram of the rotor structure A is shown, combined with Figure 4 Furthermore, the distance between the middle and end of the connecting portion 102 and the first magnet loading area 7 gradually increases. This allows the first permanent magnet 3, near the end of the connecting portion 102 and the first magnet loading area 7, to be suspended, ensuring magnetic performance. Specifically, the end of the connecting portion 102 is away from the first magnet loading area 7, while the middle of the connecting portion 102 is close to the first magnet loading area 7.

[0067] In this embodiment, combined with Figure 1The connecting portion 102 further includes two second positioning grooves 103, which are respectively arranged at opposite ends of the two slot bodies and on a side facing away from the first magnet loading portion 7. The end of each first permanent magnet 3 close to the connecting portion 102 and away from the first magnet loading portion 7 is arranged in the second positioning groove 103 on the same side. When the first permanent magnet 3 is to be installed, the other side of the end of the first permanent magnet 3 close to the connecting portion 102 can be embedded in the second positioning groove 103 to achieve the positioning of the first permanent magnet 3. At the same time, this can also leave a certain margin for the first slot body 1011 and the second slot body 1012, which is convenient for assembling the first permanent magnet 3.

[0068] In this embodiment, the thickness of the first permanent magnet in the first slot portion 1011 is greater than or equal to the thickness of the first permanent magnet in the second slot portion 1012. This allows permanent magnets of different specifications to be installed in the first slot portion 1011 and the second slot portion 1012, thereby improving magnetic performance.

[0069] Specifically, two first permanent magnets 3 are arranged on both sides of the communicating portion 102, sandwiching the communicating portion 102. The first permanent magnet 3 has a substantially rectangular shape when viewed in the axial direction, and is magnetized in the thickness direction (minor axis direction).

[0070] In this embodiment, under the premise of ensuring that the thickness of the first permanent magnet in the first slot portion 1011 is greater than or equal to the thickness of the first permanent magnet in the second slot portion 1012, the thickness of the second permanent magnet 4 in the first magnet loading portion 7 can be different from the thickness of the first permanent magnet in the first slot portion 1011 and the thickness of the first permanent magnet in the second slot portion 1012. Therefore, the first permanent magnet 3 and the second permanent magnet 4 can include two or more permanent magnets of different specifications, which can achieve free combination of three permanent magnets of different thicknesses, thereby improving magnetic properties.

[0071] Specifically: when the thickness of the first permanent magnet 3 in the first slot body portion 1011 is greater than the thickness of the first permanent magnet in the second slot body portion 1012, the width of the connecting portion 102 from the end connected to the first slot body portion 1011 to the end connected to the second slot body portion 1012 gradually decreases, ensuring that the end of the first permanent magnet 3 can enter the connecting portion 102.

[0072] When the thickness of the first permanent magnet 3 in the first slot body portion 1011 is equal to the thickness of the first permanent magnet in the second slot body portion 1012, the width from the end of the connecting portion 102 connected to the first slot body portion 1011 to the end connected to the second slot body portion 1012 is consistent, ensuring that the end of the first permanent magnet 3 can enter the connecting portion 102.

[0073] Further, combined with Figure 1The magnetic pole structure of the present invention further includes a first magnetic barrier 5 , which is connected to the end of the first slot portion 1011 close to the magnetic pole center line 2 .

[0074] In this embodiment, the first flux barrier 5 communicates with the end of the first slot portion 1011 near the magnetic pole center line 2. This can suppress leakage flux that does not contribute to torque output, further improving the output torque of the rotating electrical machine.

[0075] Specifically, combined Figure 1 The first magnetic barrier 5 includes a first slot 501 and a second slot 502. In this embodiment, the first slot 501 is connected to the end of the first slot body 1011 close to the magnetic pole centerline 2, and the second slot 502 is connected to the first slot 501. The second slot 502 is closer to the central axis of the rotor core 8 than the first slot 501.

[0076] Specifically, the first slots 501 of this embodiment first decrease in size and then increase in size from the first magnet mounting slot 1011 toward the magnetic pole centerline 2; while the second slots 502 first decrease in size and then increase in size along the radial direction of the rotor core 8. This arrangement suppresses leakage flux that does not contribute to torque output, further improving the output torque of the rotating electrical machine while ensuring the structural strength of the rotor core 8.

[0077] Specifically, in this embodiment, the first magnetic barrier 5 is generally shaped like a figure 7, comprising a first straight segment, a second straight segment, a third straight segment, a first arc segment, and a second arc segment. The first straight segment, the second straight segment, the third straight segment, the first arc segment, and the second arc segment all constitute the outline of the first magnetic barrier 5. One end of the first straight segment is connected to one side of the end of the first magnet mounting slot 1011 near the magnetic pole centerline 2. The second straight segment is arranged parallel to the magnetic pole centerline 2. One end of the second straight segment is connected to the other end of the first straight segment. The second straight segment is arranged between the first magnet mounting slot 101 and the magnetic pole centerline 2. The first arc segment is arranged between the first straight segment and the central axis of the rotor core 8. One end of the first arc segment is connected to the other end of the second straight segment. The other end of the first arc segment is connected to one end of the third straight segment. The third straight segment and the second arc segment are successively farther away from the central axis of the rotor core 8. The other end of the third straight segment is connected to one end of the second arc segment. The other end of the second arc segment is connected to the other side of the end of the first magnet mounting slot 101 near the magnetic pole centerline 2. The distance between one end of the third straight segment and the second straight segment is greater than the distance between the other end of the third straight segment and the second straight segment, and the distance between the other end of the third straight segment and the second straight segment is less than the distance between one end of the first straight segment and the second straight segment, so that the first slot 501 first shrinks and then expands from the first magnet mounting slot 101 to the magnetic pole center line 2, and the second slot 502 first shrinks and then expands along the radial direction of the rotor core 8.

[0078] In this embodiment, the end of the first permanent magnet 3 located in the first magnet mounting slot 1011, near the first magnetic barrier 5 and on one side near the first magnet loading portion 7, is suspended. This prevents one side of the end of the first permanent magnet 3 from contacting the rotor core 8, thereby preventing local demagnetization of the permanent magnet and ensuring the service life of the permanent magnet. Specifically, the end of the first permanent magnet 3, near the first magnetic barrier 5, is disposed within the first slot 501.

[0079] In this embodiment, a first positioning groove 104 is provided at the end of the magnet mounting slot 101 near the first magnetic barrier 5. The first positioning groove 104 is provided on the side of the first magnet mounting slot 1011 facing away from the first magnet loading portion 7. The other side of the end of the first permanent magnet 3 near the first magnetic barrier 5 is provided within the first positioning groove 104. When the first permanent magnet 3 is to be installed, the other side of the end of the first permanent magnet 3 near the first magnetic barrier 5 can be inserted into the first positioning groove 104 to achieve positioning of the first permanent magnet 3. At the same time, a certain margin is left between the two slot portions 101 to facilitate assembly of the first permanent magnet 3.

[0080] In this embodiment, combined with Figure 1 The magnetic pole structure further includes a first magnetic flux barrier 105 , which is connected to the end of the second slot portion 1012 away from the magnetic pole center line 2 .

[0081] Furthermore, in this embodiment, the width of the first flux barrier 105 from the end connected to the second slot body portion 1012 to the end away from the second slot body portion 1012 gradually decreases. The first flux barrier 105 can suppress leakage flux that does not contribute to the torque output, and can further improve the output torque of the rotating motor while ensuring the structural strength of the rotor core 8.

[0082] Specifically, a third positioning groove 106 is defined within the first magnetic flux barrier 105. The third positioning groove 106 is disposed on the side of the second magnet mounting groove 1012 facing away from the first magnet loading portion 7. The side of the first permanent magnet 3 near the end of the first magnetic flux barrier 105 is disposed within the third positioning groove 106. When the first permanent magnet 3 is to be installed, the other side of the first permanent magnet 3 near the end of the first magnetic flux barrier 105 can be inserted into the third positioning groove 106 to position the first permanent magnet 3. At the same time, a certain margin is left between the two slot portions 101 to facilitate assembly of the first permanent magnet 3.

[0083] Figure 5 for Figure 1 The schematic diagram of the arrangement of the air slots of the rotor structure is shown. Figure 2An air slot 6 is provided on the magnetic pole centerline 2 between the two first magnet mounting slots 1. The width of the air slot 6 is greater than the thickness of the first permanent magnet in the second slot portion 1012, thereby increasing the salient pole ratio of the motor, improving the reluctance torque of the motor, reducing the harmonic content of the air gap magnetic field, and optimizing the electromagnetic performance of the motor.

[0084] Figure 6 for Figure 1 The schematic diagram of the arrangement of the first magnet filling part of the rotor structure shown. Figure 3 The first magnet loading portion 7 includes two second magnet mounting grooves 701. The two second magnet mounting grooves 701 are symmetrically arranged relative to the magnetic pole center line, and the two first magnet loading portions 7 are V-shaped. Each of the two second magnet mounting grooves 701 is provided with a second permanent magnet 4.

[0085] Specifically, the second magnet filling portion 1 can form a V-shaped structure or a U-shaped structure, and the first magnet filling portion 7 is also a V-shaped structure, adopting a "double V" type setting. Compared with the traditional built-in "V" type structure, it can improve the utilization rate of the magnetic resistance torque of the motor, and the use of high-performance magnetic steel helps to reduce the volume of the motor, making the motor more suitable for high-speed operation.

[0086] Specifically, the angle between the two second magnet mounting slots 701 is greater than 90°, which can alleviate the local concentration of the main magnetic flux and the magnet magnetic flux and prevent magnetic saturation.

[0087] In this embodiment, the magnetic pole structure further includes a second magnetic barrier 9 connected to the end of the second magnet mounting slot 701 near the magnetic pole centerline 2. The second magnetic barrier 9 can suppress leakage flux that does not contribute to torque output, thereby further improving the output torque of the rotating electrical machine.

[0088] Furthermore, the end of each second permanent magnet 4 near the second magnetic barrier 9 (i.e., near the magnetic pole centerline 2) and away from the second magnet loading portion 1 is suspended. This prevents the end of the second permanent magnet 4 near the second magnetic barrier 9 and away from the second magnet loading portion 1 from contacting the rotor core 8, thereby preventing local demagnetization of the permanent magnet and ensuring the service life of the permanent magnet.

[0089] Specifically, combined Figure 3 The second magnetic barrier 9 gradually increases in size from the second magnet mounting slot 701 to the magnetic pole center line 2 , which can further reduce magnetic leakage and at the same time ensure the structural strength of the rotor core 8 .

[0090] In this embodiment, a fourth positioning groove 7011 is provided at the end of the second magnet mounting groove 701 near the second magnetic barrier 9. The fourth positioning groove 7011 is provided on the side of the second magnet mounting groove 701 facing the second magnet loading portion 1, and the other side of the end of the second permanent magnet 9 near the second magnetic barrier 9 is provided within the fourth positioning groove 7011. When the second permanent magnet 9 is to be installed, the other side of the end of the second permanent magnet 9 near the second magnetic barrier 9 can be inserted into the fourth positioning groove 7011 to achieve positioning of the second permanent magnet 4. At the same time, a certain margin is left in the two second magnet mounting grooves 701 to facilitate the assembly of the second permanent magnet 9.

[0091] Specifically, in this embodiment, the magnetic pole structure further includes a second magnetic flux barrier 10, which is connected to the end of the second magnet mounting slot 701 away from the magnetic pole centerline 2. The second magnetic flux barrier 10 of this embodiment can hinder the flow of magnetic flux.

[0092] Furthermore, a fifth positioning groove 1001 is defined within the second magnetic flux barrier 10. The fifth positioning groove 1001 is disposed on the side of the second magnet mounting groove 701 facing the second magnet loading portion 1. The side of the second permanent magnet 4 near the end of the second magnetic flux barrier 10 is disposed within the fifth positioning groove 1001. When the second permanent magnet 4 is to be installed, the other side of the second permanent magnet 4 near the end of the second magnetic flux barrier 10 can be embedded within the fifth positioning groove 1001 to achieve positioning of the second permanent magnet 4. At the same time, a certain margin is left in the two second magnet mounting grooves 701 to facilitate assembly of the second permanent magnet 4.

[0093] In this embodiment, an even number of magnetic pole structures are arranged at equal intervals in the circumferential direction on the end surface of rotor core 8. The polarity of these even-numbered magnetic pole structures alternates in the circumferential direction. Each magnetic pole structure is composed of a plurality of first permanent magnets 3 and a plurality of second permanent magnets 4 mounted in a plurality of first magnet mounting portions 1 and a plurality of second magnet mounting portions 7.

[0094] In this embodiment, combined with Figure 4 The second magnet loading portion 1 and the first magnet loading portion 7 are arranged in sequence along the radial direction of the rotor core, and are provided with two magnet mounting grooves 101 and a plurality of first permanent magnets 3 loaded into the two magnet mounting grooves 101. The two magnet mounting grooves 101 are symmetrically arranged relative to the magnetic pole center line 2 in a manner that forms a roughly V-shaped or roughly U-shaped shape that opens radially outward. Each magnet mounting groove 101 is also a hole that penetrates the rotor core 8 in the axial direction, similarly to the second magnet mounting groove 701. However, when the magnet mounting groove 1 is observed in the axial direction, it has a broken line shape including one or more bending points. In more detail, the first magnet mounting groove 101 of this example has a roughly V-shaped shape including a central side portion extending from the bending point toward the magnetic pole center line 2 side and an outer side portion extending from the bending point toward the outer periphery of the rotor core 8.

[0095] Specifically, in this embodiment, the second magnet mounting slot 701 has a substantially rectangular shape when viewed axially. The second permanent magnet 4 also has a substantially rectangular shape when viewed axially, similarly to the second magnet mounting slot 701. In addition, the second permanent magnet 4 is magnetized in its thickness direction (minor axis direction).

[0096] A magnetic path through which magnetic flux flows is formed between the second magnet loading portion 1 and the first magnet loading portion 7 .

[0097] Figure 7 for Figure 1 The schematic diagram of the arrangement of the first auxiliary arc slot and the second auxiliary arc slot of the rotor structure is shown. Figure 8 for Figure 7 The schematic diagram of the arrangement of the first auxiliary arc slot of the rotor structure is shown in FIG. Figure 8 The circumferential surface of the rotor core 8 is provided with two first auxiliary arcuate slots 801 spaced apart within the first magnet-filling portion 7. These first auxiliary arcuate slots 801 reduce the impact of higher harmonics on the motor's vibration and noise, ensuring efficient and reliable operation during high-speed operation. This makes the motor more suitable for high-speed operation, effectively improves the air gap flux density waveform, and reduces higher harmonic content. This not only reduces the motor's iron loss and prevents excessive temperature rise at high speeds, but also helps reduce torque ripple, improving vibration and noise.

[0098] Furthermore, the bending direction of the first auxiliary arc-shaped slot 801 of this embodiment is toward the radial inside of the rotor core 8 .

[0099] Figure 9 for Figure 7 The schematic diagram of the arrangement of the second auxiliary arc slot of the rotor structure is shown in FIG. Figure 9 The circumferential surface of the rotor core 8 is provided with a second auxiliary arcuate slot 802 within both the first magnet-filling portion 7 and the second magnet-filling portion 1. These second auxiliary arcuate slots 802 reduce the impact of higher harmonics on the motor's vibration and noise, ensuring efficient and reliable operation during high-speed operation. This makes the motor more suitable for high-speed operation, effectively improves the motor's air gap flux density waveform, and reduces higher harmonic content. This not only reduces the motor's iron loss and prevents excessive temperature rise at high speeds, but also helps reduce the motor's torque ripple, improving vibration and noise.

[0100] Furthermore, the bending direction of the second auxiliary arc-shaped slot 802 of this embodiment is toward the radial inside of the rotor core 8 .

[0101] Furthermore, the present invention also proposes a permanent magnet motor, which adopts the rotor structure. The specific structure of the rotor structure refers to the above-mentioned embodiment. Since the rotor structure adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0102] As is well known, the output torque of a permanent magnet motor becomes a composite torque of reluctance torque and magnetic torque. Reluctance torque is a torque generated by the attraction between the poles formed by the rotating magnetic field of the stator and the salient poles of the rotor. The reluctance torque increases as the main magnetic flux flowing through the rotor core 8 in a roughly circumferential direction across the magnetic pole centerline 2 increases. In addition, magnetic torque is a torque generated by the attraction and repulsion between the poles of the rotating magnetic field of the stator and the magnetic poles of the rotor. The magnetic torque increases as the magnetic flux flowing through the rotor core 8 increases while passing through each first permanent magnet 3 and second permanent magnet 4. In this example, the magnet loading portion and the first magnet loading portion 7 are configured in two layers, so that the total amount of the first permanent magnet 3 and the second permanent magnet 4 and thus the total amount of magnetic flux can be increased compared to the case of a one-layer configuration. In addition, in this example, two first permanent magnets 3 are loaded in one first magnet mounting slot 1. As a result, the total number of first permanent magnets 3 and second permanent magnets 4 and thus the magnetic flux can be increased compared to the case where only one first permanent magnet 3 is installed in one first magnet mounting slot 101. Moreover, the output torque of the permanent magnet motor can also be improved by increasing the magnetic flux.

[0103] Figure 10 This is a structural diagram of the permanent magnet motor of this embodiment, see Figure 10 The rotor structure and the permanent magnet motor having the rotor structure provided in this embodiment can prevent one side of the end of the first permanent magnet from contacting the rotor core, thereby preventing local demagnetization of the permanent magnet. It can at least solve the technical problem of permanent magnet demagnetization during the use of the permanent magnet synchronous motor to a certain extent, thereby ensuring the service life of the permanent magnet and having great practical value.

[0104] In the description of the present application, 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" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application 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 should not be understood as a limitation on the present application.

[0105] In addition, the descriptions of "first", "second", etc. in this application are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0106] In the description of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0107] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means 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 application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0108] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0109] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A rotor structure, characterized in that: The invention comprises a rotor core and a plurality of magnetic pole structures arranged along the circumference of the rotor core, wherein each of the magnetic pole structures comprises: a first magnet filling portion and a second magnet filling portion arranged between the first magnet filling portion and the central axis of the rotor core; The second magnet loading portion includes two first magnet mounting grooves symmetrical with respect to the magnetic pole center line, each of the first magnet mounting grooves includes a first groove portion close to the magnetic pole center line, a second groove portion away from the magnetic pole center line, and a connecting portion connecting the first groove portion and the second groove portion; The angle between the opening direction of the first slot body portion and the center line of the magnetic pole is greater than the angle between the opening direction of the second slot body portion and the center line of the magnetic pole. First permanent magnets are provided in both the first slot body portion and the second slot body portion. The ends of the two first permanent magnets close to the connecting portion and one side close to the first magnet loading portion are suspended to prevent one side of the end of the first permanent magnet from contacting the rotor core.

2. The rotor structure according to claim 1, characterized in that: A distance from a middle portion of the communicating portion to the first magnet loading portion is smaller than a distance from both ends of the communicating portion to the first magnet loading portion.

3. The rotor structure according to claim 1 or 2, characterized in that: The distance from the middle portion to the end portion of the communication portion and the first magnet loading portion gradually increases.

4. The rotor structure according to claim 1, characterized in that: The thickness of the first permanent magnet in the first slot portion is greater than or equal to the thickness of the first permanent magnet in the second slot portion.

5. The rotor structure according to claim 1, characterized in that: The magnetic pole structure further includes a first magnetic barrier connected to an end of the first slot portion close to the magnetic pole center line.

6. The rotor structure according to claim 5, characterized in that: The end portion of the first permanent magnet close to the first magnetic barrier and one side close to the first magnet filling portion is suspended.

7. The rotor structure according to claim 5, characterized in that: The first magnetic barrier includes a first slot and a second slot; The first slot is connected to an end portion of the first slot body portion close to the center line of the magnetic pole; The second groove is communicated with the first groove.

8. The rotor structure according to claim 7, characterized in that: The first slot first shrinks and then expands in a direction from the first magnet mounting slot to the magnetic pole centerline; The second slot first shrinks and then expands along the radial direction of the rotor core.

9. The rotor structure according to claim 1, characterized in that: The magnetic pole structure further includes a first magnetic flux barrier connected to an end of the second slot portion away from the magnetic pole center line.

10. The rotor structure according to claim 9, characterized in that: The width of the first magnetic flux barrier gradually decreases from an end portion connected to the second slot portion to an end portion away from the second slot portion.

11. The rotor structure according to claim 1, characterized in that: The first magnet loading portion includes two second magnet mounting grooves symmetrical with respect to the magnetic pole center line; A second permanent magnet is disposed in each of the two second magnet installation grooves; An end portion of each of the second permanent magnets close to the magnetic pole centerline and away from the second magnet filling portion is suspended.

12. The rotor structure according to claim 1, characterized in that: The first permanent magnet and the second permanent magnet include two or more permanent magnets of different specifications.

13. A permanent magnet motor, characterized in that: It comprises the permanent magnet rotor structure according to any one of claims 1 to 12.

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