Rotor structure and motor having the same

Abstract

The present invention provides a rotor structure and a motor having the same. The rotor structure comprises: a rotor body including a plurality of magnetic poles spaced circumferentially along the rotor body; and a plurality of magnetizing assemblies disposed within the rotor body, the magnetizing assemblies being paired with the magnetic poles. The magnetic permeability of the magnetizing assemblies is greater than that of the rotor body. This rotor structure solves the problem of increased motor saturation caused by rotor openings in the prior art.

Description

Technical Field

[0001] The present invention relates to the field of motors, and in particular to a rotor structure and a motor having the same. Background Art

[0002] At present, the main development trend of compressor motors is high speed and low permanent magnetization, which puts higher requirements on the motor's speed and smoothness of output torque.

[0003] However, optimizing the air gap magnetic field in motors often involves creating magnetic holes on the rotor edge to optimize the magnetic field distribution. This method blocks the magnetic flux distribution path, forcing it to follow the designer's intended distribution. This significantly reduces the rotor's magnetic permeability, increasing the motor's saturation and causing a 12% increase in rotor iron loss, further increasing motor losses. It also increases the motor's torque ripple.

[0004] Furthermore, traditional interior permanent magnet motors rely primarily on permanent magnet torque, which not only consumes rare earth resources but also limits the motor's speed range. Therefore, alternating-pole motors were developed to address these issues. However, saturation of alternating-pole interior rotors primarily occurs near the outer diameter of the rotor, where the magnets are also affected by edge effects, further exacerbating uneven air gap magnetic field distribution. Summary of the Invention

[0005] The main purpose of the present invention is to provide a rotor structure and a motor having the same, so as to solve the problem in the prior art that the rotor opening increases the saturation of the motor.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a rotor structure is provided, comprising: a rotor body, comprising a plurality of magnetic poles, wherein the plurality of magnetic poles are arranged at circumferential intervals along the rotor body; a plurality of magnetizing assemblies, arranged on the rotor body, wherein the magnetizing assemblies and the magnetic poles are arranged in pairs; wherein the magnetic permeability of the magnetizing assemblies is greater than the magnetic permeability of the rotor body.

[0007] Furthermore, the multiple magnetic poles include permanent magnetic poles, which include mounting grooves for placing permanent magnets. There are two mounting grooves, which are arranged in a V shape. The magnetizing assembly is arranged between the two mounting grooves, and the magnetizing assembly includes two magnetizing components, which are arranged in pairs with the mounting grooves.

[0008] Furthermore, the two mounting grooves are symmetrically arranged relative to a first symmetrical plane, and the two magnetic attraction components are symmetrically arranged relative to the first symmetrical plane; wherein the first symmetrical plane is an axial cross-section of the rotor body.

[0009] Furthermore, the magnetic attraction component includes a first magnetic attraction block and a second magnetic attraction block. The first magnetic attraction block and the second magnetic attraction block are both spaced apart from the paired mounting grooves, and the first magnetic attraction block is arranged between the second magnetic attraction block and the mounting groove.

[0010] Furthermore, the first magnetic block has a first end and a second end that are relatively arranged along the circumference of the rotor body, the first end of the first magnetic block is located on the side of the second end of the first magnetic block close to the mounting groove, the first end of the first magnetic block has a first side surface and a second side surface, the first side surface and the second side surface are arranged in sequence from the rotor outer side wall of the rotor body to the axis of the rotor body, and the first side surface and the second side surface are arranged obliquely; the second end of the first magnetic block has a third side surface; the first magnetic block also has a fourth side surface, one end of the fourth side surface is connected to the first side surface, and the other end of the fourth side surface is connected to the third side surface.

[0011] Furthermore, the second magnetic block has a first end and a second end that are relatively arranged along the circumferential direction of the rotor body, the second end of the second magnetic block is located on the side of the first end of the second magnetic block away from the first magnetic block, the first end of the second magnetic block has a fifth side surface, a sixth side surface and a seventh side surface, the fifth side surface, the sixth side surface and the seventh side surface are arranged in sequence from the outer side wall of the rotor to the axis of the rotor body, the fifth side surface and the sixth side surface are arranged at an angle, and the sixth side surface and the seventh side surface are arranged at an angle; the second end of the second magnetic block has an eighth side surface; the second magnetic block also has a ninth side surface, one end of the ninth side surface is connected to the fifth side surface, and the other end of the ninth side surface is connected to the eighth side surface.

[0012] Furthermore, the angle between the first side surfaces of the two first magnetic blocks of the magnetic attraction assembly is ob; the angle between the eighth side surfaces of the two second magnetic blocks of the magnetic attraction assembly is oc; wherein ob≤oc≤0.75*ob.

[0013] Furthermore, the fourth side surface and the ninth side surface both coincide with a portion of the surface of the first reference cylindrical surface, and the axis of the first reference cylindrical surface coincides with the axis of the rotor body.

[0014] Furthermore, the mounting slot includes a mounting slot body, a first air gap slot and a second air gap slot, and the mounting slot body is used to place the permanent magnet; the first air gap slot and the second air gap slot are arranged on opposite sides of the mounting slot body, the first air gap slot is connected to the first end of the mounting slot body, and the second air gap slot is connected to the second end of the mounting slot body; the first air gap slot has a first slot wall, and a first magnetic isolation bridge is formed between the first slot wall and the outer rotor wall of the rotor body, and a second magnetic isolation bridge is formed between the second air gap slots of the two mounting slots of the permanent magnet pole.

[0015] Furthermore, the first air gap groove has a first communicating port, which is connected to the mounting groove body. The first air gap groove also has a second groove wall, a third groove wall and a fourth groove wall. From the first end of the first communicating port to the second end of the first communicating port, the third groove wall, the second groove wall, the first groove wall, and the fourth groove wall are arranged in sequence; the second groove wall and the fourth groove wall are arranged opposite to each other and are located on opposite sides of the first groove wall; the first communicating port and the third groove wall are both arranged opposite to the first groove wall.

[0016] Furthermore, the width of the mounting groove body is Hm, and the width of the first groove wall is g; wherein, 1.5*Hm≤g≤2*Hm.

[0017] Furthermore, the first magnetic block has a fourth side surface; the second magnetic block has a ninth side surface; the fourth side surface, the ninth side surface and the first groove wall all coincide with partial surfaces of the first reference cylindrical surface; the axis of the first reference cylindrical surface coincides with the axis of the rotor body; the distances between the fourth side surface, the ninth side surface and the first groove wall and the outer side wall of the rotor along the radial direction of the rotor body are all y; the first end of the second magnetic block has a fifth side surface and a sixth side surface, and the fifth side surface and the sixth side surface are arranged in sequence from the outer side wall of the rotor to the axis of the rotor body, the width of the fifth side surface is e1, and the width of the sixth side surface is e2; wherein, e1≤y≤e2.

[0018] Furthermore, the first slot wall has a first sideline and a second sideline that are oppositely arranged along the circumference of the rotor body, and an angle between a plane passing through the first sideline and the second sideline and the third slot wall is o1; wherein o1 ≥ 30°.

[0019] Furthermore, the mounting slot body has a fifth slot wall and a sixth slot wall arranged opposite to each other, and the fifth slot wall is located on the side of the sixth slot wall away from the first magnetic block; the first end of the first magnetic block has a first side surface and a second side surface, and the first side surface and the second side surface are arranged in sequence from the outer wall of the rotor to the axis of the rotor body; the first side surface is arranged parallel to the fourth slot wall, and the second side surface is arranged parallel to the sixth slot wall, and the distance between the first side surface and the fourth slot wall and the distance between the second side surface and the sixth slot wall are both L1; the permanent magnet is spaced apart from the sixth slot wall, and the distance between the permanent magnet and the sixth slot wall is air1; wherein, 2*air1≤L1≤4*air1.

[0020] Furthermore, the two mounting slots are symmetrically arranged relative to the first symmetry plane; the rotor body includes at least one permanent magnet pole, and the number of permanent magnet poles is p; the second slot wall and the fourth slot wall are arranged in parallel, and the angle between the second slot wall and the first symmetry plane is 360 / 2*p.

[0021] Furthermore, the rotor body has a central hole, and the minimum distance between the central hole and the mounting groove is greater than the radius of the central hole.

[0022] Furthermore, the minimum magnetic permeability of the magnetic attraction component is μ3, and the minimum magnetic permeability of the rotor body is μ4; wherein 9*μ4≤μ3.

[0023] According to another aspect of the present invention, a motor is provided, comprising a rotor structure and a stator, wherein the rotor structure is the above-mentioned rotor structure.

[0024] The rotor structure of the present invention includes a rotor body, wherein a plurality of magnetic poles of the rotor body are arranged at intervals along the circumference of the rotor body; the rotor structure also includes a plurality of magnetic attraction components, which are arranged on the rotor body and are arranged in pairs with the magnetic poles; wherein the magnetic permeability of the magnetic attraction components is greater than the magnetic permeability of the rotor body. In the magnetic field distribution of the motor, the magnetic lines of force follow a path with high magnetic permeability. By setting the magnetic permeability of the magnetic attraction components to be greater than the magnetic permeability of the rotor body, the local magnetic lines of force of the rotor structure are concentrated in the part with high magnetic permeability, which greatly reduces the local magnetic flux density of the rotor structure, which is similar to opening a hole at that location, but does not result in an extreme state where there are no magnetic lines of force in that location, thereby enhancing the anti-saturation capability of the motor. In addition, the rotor structure uses the method of "induction instead of resistance" to increase the rotor saturation caused by the traditional method of opening a hole for magnetic conduction, thereby solving the problem of expanding the outer diameter of the rotor. This makes the motor smaller and further reduces the material consumption of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0026] Figure 1 A cross-sectional view showing an embodiment of a rotor structure according to the present invention;

[0027] Figure 2 Shown Figure 1 A first partial enlarged view of an embodiment of a rotor structure in FIG;

[0028] Figure 3 Shown Figure 1 A second partial enlarged view of an embodiment of the rotor structure in FIG.

[0029] Figure 4 Shown Figure 1 A third partial enlarged view of an embodiment of the rotor structure in FIG.

[0030] Figure 5 Shown Figure 2 A partial enlarged view of an embodiment of the rotor structure;

[0031] Figure 6 Shown Figure 1 A fourth partial enlarged view of an embodiment of the rotor structure in FIG.

[0032] Figure 7 A comparison diagram showing the air gap magnetic flux density of a motor with a rotor opening in the prior art and the air gap magnetic flux density of the present application is shown;

[0033] Figure 8 A comparison diagram showing the torque ripple of a motor with a rotor hole in the prior art and the torque ripple of the present application is shown;

[0034] Figure 9 A comparison diagram of the rotor loss of a motor with a rotor hole in the prior art and the rotor loss of the present application is shown.

[0035] The above drawings include the following reference numerals:

[0036] 10. Rotor body; 11. Magnetic pole; 12. Permanent magnet pole; 13. Permanent magnet; 14. Mounting slot; 141. Mounting slot body; 142. First air gap slot; 143. Second air gap slot; 144. First slot wall; 145. Second slot wall; 146. Third slot wall; 147. Fourth slot wall; 148. Fifth slot wall; 149. Sixth slot wall; 15. Rotor outer wall; 16. First magnetic isolation bridge; 17. Second magnetic isolation bridge ;18. Center hole;19. Magnetic resistance pole;20. Magnetic attraction assembly;21. Magnetic attraction component;22. First magnetic attraction block;221. First side surface;222. Second side surface;223. Third side surface;224. Fourth side surface;23. Second magnetic attraction block;231. Fifth side surface;232. Sixth side surface;233. Seventh side surface;234. Eighth side surface;235. Ninth side surface;40. First connecting port;50. Plane. DETAILED DESCRIPTION

[0037] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0038] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0039] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0040] The present invention provides a rotor structure, please refer to Figures 1 to 9 , including: a rotor body 10, including a plurality of magnetic poles 11, the plurality of magnetic poles 11 are arranged at intervals along the circumference of the rotor body 10; a plurality of magnetizing components 20, arranged on the rotor body 10, the magnetizing components 20 and the magnetic poles 11 are arranged in pairs; wherein the magnetic permeability of the magnetizing components 20 is greater than the magnetic permeability of the rotor body 10.

[0041] The rotor structure of the present invention includes a rotor body 10 having a plurality of magnetic poles 11 spaced apart along the circumference of the rotor body 10. The rotor structure also includes a plurality of magnetic attraction assemblies 20 disposed on the rotor body 10, the magnetic attraction assemblies 20 being paired with the magnetic poles 11. The magnetic attraction assemblies 20 have a greater magnetic permeability than the rotor body 10. In the magnetic field distribution of the motor, magnetic lines of force follow paths of high permeability. By setting the magnetic permeability of the magnetic attraction assemblies 20 to be greater than that of the rotor body 10, the local magnetic lines of force of the rotor structure are concentrated in the high permeability portion, significantly reducing the magnetic flux density in the local area of ​​the rotor structure, similar to having a hole in that location, but without the extreme state of no magnetic lines of force in that location. This enhances the motor's anti-saturation capability. Furthermore, the rotor structure employs a "replacement of resistance with induction" approach to increase rotor saturation, thereby addressing the problem of increasing the rotor's outer diameter caused by traditional methods of magnetically conducting holes through holes. This allows for a smaller motor and further reduces material usage.

[0042] In this embodiment, the plurality of magnetic poles 11 include permanent magnet poles 12, each of which includes two mounting slots 14 for receiving a permanent magnet 13. The mounting slots 14 are arranged in a V-shape. A magnetizing assembly 20 is disposed between the two mounting slots 14 and includes two magnetizing components 21, which are paired with the mounting slots 14. This arrangement helps suppress the back-EMF harmonics of the motor.

[0043] Specifically, the magnetization directions of the permanent magnets 13 along the outer circumference of the rotor are the same.

[0044] In this embodiment, the two mounting slots 14 are symmetrically arranged relative to the first symmetric plane, and the two magnetic attracting components 21 are symmetrically arranged relative to the first symmetric plane; wherein the first symmetric plane is the axial cross section of the rotor body 10 .

[0045] Specifically, the first symmetry plane passes through the axis of the rotor body 10; there are multiple first symmetry planes, and the multiple first symmetry planes are arranged in one-to-one correspondence with the multiple magnetic poles 11, and the two magnetic attraction components 21 on each magnetic pole 11 are symmetrically arranged relative to the corresponding first symmetry plane.

[0046] In this embodiment, the magnetic attracting member 21 includes a first magnetic attracting block 22 and a second magnetic attracting block 23. Both the first magnetic attracting block 22 and the second magnetic attracting block 23 are arranged at intervals from the paired mounting grooves 14, and the first magnetic attracting block 22 is arranged between the second magnetic attracting block 23 and the mounting grooves 14. Such an arrangement further helps to suppress the back electromotive force harmonics of the motor.

[0047] In this embodiment, the first magnetic attracting block 22 has a first end and a second end arranged oppositely along the circumferential direction of the rotor body 10. The first end of the first magnetic attracting block 22 is located on the side closer to the mounting groove 14 of the second end of the first magnetic attracting block 22. The first end of the first magnetic attracting block 22 has a first side surface 221 and a second side surface 222, and the first side surface 221 and the second side surface 222 are arranged in sequence from the outer side wall 15 of the rotor of the rotor body 10 to the axis of the rotor body 10, and the first side surface 221 and the second side surface 222 are inclined to each other; the second end of the first magnetic attracting block 22 has a third side surface 223; the first magnetic attracting block 22 further has a fourth side surface 224, one end of the fourth side surface 224 is connected to the first side surface 221, and the other end of the fourth side surface 224 is connected to the third side surface 223. Such an arrangement can optimize the magnetic field structure, realize the optimization of the magnetic field waveform, enable the magnetic force lines to pass through along the path with the maximum magnetic conductance, avoid the positions of traditional punching, and realize the "substituting attraction for resistance" method. At the same time, the area where the magnetic force lines avoid can also conduct magnetic flux when the magnetic attracting blocks (including the first magnetic attracting block 22 and the second magnetic attracting block 23) are saturated, which further reduces the phenomenon of magnetic leakage.

[0048] In this embodiment, the included angle between the second side surface 222 and the third side surface 223 is between 0 degrees and 180 degrees. Specifically, the included angle between the second side surface 222 and the third side surface 223 is ob1; where 0° < ob1 ≤ 60°. Such an arrangement can further optimize the magnetic field structure.

[0049] It should be noted that the included angle between the first side surface 221 and the second side surface 222 is between 0 degrees and 180 degrees.

[0050] In this embodiment, the second magnetic attracting block 23 has a first end and a second end arranged oppositely along the circumferential direction of the rotor body 10. The second end of the second magnetic attracting block 23 is located on the side of the first end of the second magnetic attracting block 23 away from the first magnetic attracting block 22. The first end of the second magnetic attracting block 23 has a fifth side surface 231, a sixth side surface 232, and a seventh side surface 233. The fifth side surface 231, the sixth side surface 232, and the seventh side surface 233 are arranged in sequence from the outer side wall 15 of the rotor to the axis of the rotor body 10. The fifth side surface 231 and the sixth side surface 232 are inclined to each other, and the sixth side surface 232 and the seventh side surface 233 are inclined to each other; the second end of the second magnetic attracting block 23 has an eighth side surface 234; the second magnetic attracting block 23 further has a ninth side surface 235. One end of the ninth side surface 235 is connected to the fifth side surface 231, and the other end of the ninth side surface 235 is connected to the eighth side surface 234. Such a setting can optimize the magnetic field structure, achieve the optimization of the magnetic field waveform, enable the magnetic force lines to pass along the path with the maximum magnetic conductance, avoid the positions of traditional punching, and achieve the "substituting resistance with attraction" method. At the same time, the area where the magnetic force lines avoid can also conduct magnetism when the magnetic attracting blocks (including the first magnetic attracting block 22 and the second magnetic attracting block 23) are saturated, which further reduces the phenomenon of magnetic leakage.

[0051] It should be noted that the included angle between the fifth side surface 231 and the sixth side surface 232 is between 0 degrees and 180 degrees, and the included angle between the sixth side surface 232 and the seventh side surface 233 is between 0 degrees and 180 degrees.

[0052] In this embodiment, the fifth side surface 231 and the eighth side surface 234 are parallel; the included angle between the third side surface 223 and the sixth side surface 232 is o2, and the included angle between the seventh side surface 233 and the eighth side surface 234 is o3. Such a setting can optimize the magnetic field structure and achieve the optimal design of the magnetic field waveform optimization. Enable the magnetic force lines to pass along the path with the maximum magnetic conductance, avoid the positions of traditional punching, and achieve the "substituting resistance with attraction" method. At the same time, the area where the magnetic force lines avoid can also conduct magnetism when the magnetic attracting blocks (including the first magnetic attracting block 22 and the second magnetic attracting block 23) are saturated, which further reduces the phenomenon of magnetic leakage.

[0053] Specifically, the relationship between ob1 and o2 is satisfied: 90° - ob1 ≤ o2 ≤ 90°. Such a setting makes the magnetic field waveform relatively optimized.

[0054] Specifically, 0° < o3 ≤ 90°. Such a setting makes the magnetic field waveform relatively optimized.

[0055] In this embodiment, the angle between the first side surfaces 221 of the two first magnetic blocks 22 of the magnetic assembly 20 is ob; the angle between the eighth side surfaces 234 of the two second magnetic blocks 23 of the magnetic assembly 20 is oc; wherein ob≤oc≤0.75*ob. This configuration can optimize the magnetic field structure and achieve an optimal design for optimizing the magnetic field waveform. This allows the magnetic lines of force to pass along the path with the greatest magnetic conductivity, avoiding the locations of traditional drillings, thus achieving a "leading instead of resisting" approach. At the same time, the areas avoided by the magnetic lines of force can also conduct magnetism after the magnetic blocks (including the first magnetic block 22 and the second magnetic block 23) are saturated, thereby further reducing magnetic leakage.

[0056] In this embodiment, the fourth side surface 224 and the ninth side surface 235 both overlap partially with the surface of the first reference cylindrical surface, and the axis of the first reference cylindrical surface coincides with the axis of the rotor body 10. The layout of the fourth side surface 224 and the ninth side surface 235 directly affects the distribution of magnetic flux lines. If the inner diameter R1 of the first reference cylindrical surface is too small, the effect of optimizing the air gap magnetic field will be greatly reduced.

[0057] In this embodiment, the mounting slot 14 includes a mounting slot body 141, a first air gap slot 142 and a second air gap slot 143. The mounting slot body 141 is used to place the permanent magnet 13; the first air gap slot 142 and the second air gap slot 143 are arranged on opposite sides of the mounting slot body 141, the first air gap slot 142 is connected to the first end of the mounting slot body 141, and the second air gap slot 143 is connected to the second end of the mounting slot body 141; the first air gap slot 142 has a first slot wall 144, and a first magnetic isolation bridge 16 is formed between the first slot wall 144 and the rotor outer side wall 15 of the rotor body 10, and a second magnetic isolation bridge 17 is formed between the second air gap slots 143 of the two mounting slots 14 of the permanent magnet pole 12.

[0058] Specifically, the second air gap groove 143 has a seventh groove wall and an eighth groove wall, a second magnetic isolation bridge 17 is formed between the seventh groove wall and the eighth groove wall, and the seventh groove wall and the eighth groove wall are parallel to each other.

[0059] In this embodiment, the first air gap groove 142 has a first connecting port 40, which is connected to the mounting slot body 141. The first air gap groove 142 also has a second groove wall 145, a third groove wall 146 and a fourth groove wall 147. From the first end of the first connecting port 40 to the second end of the first connecting port 40, the third groove wall 146, the second groove wall 145, the first groove wall 144, and the fourth groove wall 147 are arranged in sequence; the second groove wall 145 and the fourth groove wall 147 are arranged opposite to each other and are located on opposite sides of the first groove wall 144; the first connecting port 40 and the third groove wall 146 are both arranged opposite to the first groove wall 144.

[0060] In this embodiment, the width of the mounting slot body 141 is Hm, and the width of the first slot wall 144 is g; where 1.5*Hm≤g≤2*Hm. This configuration ensures that the air gap flux density of the motor is increased while minimizing the increase in harmonic content. The width g of the first slot wall 144 is set to compensate for the lower magnetic flux density of the reluctance pole 19 compared to the permanent magnet pole.

[0061] It should be noted that permanent magnet poles 12 refer to the magnetic poles added to the alternating-pole motor. Compared to traditional structures, alternating-pole motors have magnets removed in certain locations. These removed magnets provide reluctance torque in the magnetic circuit, hence the name reluctance poles 19. The permanent magnet poles 12 and reluctance poles 19 are arranged alternately along the circumference of the rotor body.

[0062] It should be noted that the fifth slot wall 148 and the sixth slot wall 149 are arranged in parallel, and the width of the mounting slot body 141 is the distance between the fifth slot wall 148 and the sixth slot wall 149 .

[0063] It should be noted that the second groove wall 145 and the fourth groove wall 147 are arranged in parallel, and the width of the first groove wall 144 is the distance between the second groove wall 145 and the fourth groove wall 147 .

[0064] In this embodiment, the first magnetizing block 22 has a fourth side surface 224; the second magnetizing block 23 has a ninth side surface 235. The fourth side surface 224, the ninth side surface 235, and the first slot wall 144 all coincide with portions of the first reference cylindrical surface. The axis of the first reference cylindrical surface coincides with the axis of the rotor body 10. The fourth side surface 224, the ninth side surface 235, and the first slot wall 144 are all spaced radially apart from the rotor outer wall 15 by a distance y. The first end of the second magnetizing block 23 has a fifth side surface 231 and a sixth side surface 232, which are arranged sequentially from the rotor outer wall 15 to the axis of the rotor body 10. The width of the fifth side surface 231 is e1, and the width of the sixth side surface 232 is e2. Here, e1 ≤ y ≤ e2. This arrangement ensures that the inter-pole magnetic flux leakage of the motor and the magnetic field combing effect of the magnetizing blocks (including the first and second magnetizing blocks) are optimized.

[0065] Specifically, the distance between the first slot wall 144 and the rotor outer side wall 15 along the radial direction of the rotor body 10 is also the width of the first magnetic isolation bridge 16 along the radial direction of the rotor body 10 .

[0066] In this embodiment, the first slot wall 144 has a first edge and a second edge that are oppositely disposed along the circumference of the rotor body 10. The included angle between a plane 50 passing through the first and second edges and the third slot wall 146 is o1, where o1 is ≥ 30°. This angle primarily improves magnetic flux leakage at the ends of the magnetic poles.

[0067] In this embodiment, the mounting slot body 141 has a fifth slot wall 148 and a sixth slot wall 149 that are arranged opposite to each other, and the fifth slot wall 148 is located on the side of the sixth slot wall 149 away from the first magnetic block 22; the first end of the first magnetic block 22 has a first side surface 221 and a second side surface 222, and the first side surface 221 and the second side surface 222 are arranged in sequence from the rotor outer side wall 15 to the axis of the rotor body 10; the first side surface 221 is arranged parallel to the fourth slot wall 147, and the second side surface 222 is arranged parallel to the sixth slot wall 149, and the distance between the first side surface 221 and the fourth slot wall 147 and the distance between the second side surface 222 and the sixth slot wall 149 are both L1; the permanent magnet 13 is spaced apart from the sixth slot wall 149, and the distance between the permanent magnet 13 and the sixth slot wall 149 is air1; wherein 2*air1≤L1≤4*air1. Such a setting mainly affects the placement of the magnetic blocks (including the first magnetic block and the second magnetic block) in the punching sheets of the rotor body, ensuring that the first magnetic block and the second magnetic block fully guide the magnetic field without affecting the processing difficulty and strength of the punching sheets.

[0068] It should be noted that the distance between the permanent magnet 13 and the sixth slot wall 149 is the distance between the end face of the permanent magnet 13 and the sixth slot wall 149, wherein the end face of the permanent magnet 13 is arranged opposite to the sixth slot wall 149, and the end face of the permanent magnet 13 is parallel to the sixth slot wall 149.

[0069] In this embodiment, the two mounting grooves 14 are symmetrically arranged relative to the first symmetry plane; the rotor body 10 includes at least one permanent magnet pole 12, and the number of permanent magnet poles 12 is p; the second groove wall 145 and the fourth groove wall 147 are arranged in parallel, and the angle between the second groove wall 145 and the first symmetry plane is 360 / 2*p.

[0070] In this embodiment, the rotor body 10 has a central hole 18, and the minimum distance between the central hole 18 and the mounting slot 14 is greater than the radius Ri of the central hole 18. This arrangement can ensure the magnetic flux density of the rotor yoke while having sufficient output torque.

[0071] In this embodiment, the minimum magnetic permeability of the magnetizing assembly 20 is μ3, and the minimum magnetic permeability of the rotor body 10 is μ4; wherein, 9*μ4≤μ3. It should be noted that the material of the magnetizing blocks (including the first magnetizing block 22 and the second magnetizing block 23) is not limited to a material with a single magnetic permeability. The magnetic permeabilities of the two magnetizing components 21 of the magnetizing assembly 20 may be the same or different, and the magnetic permeabilities of the first magnetizing block 22 and the second magnetizing block 23 in the magnetizing component 21 may be the same or different. The magnetic permeabilities of different parts of the rotor body 10 may be the same or different, with a minimum magnetic permeability of μ4. This configuration can save material used for the magnetizing blocks (including the first magnetizing block 22 and the second magnetizing block 23) and reduce the processing cost of the motor.

[0072] In one embodiment, the magnetic permeability of the first magnetic attraction block 22 and the second magnetic attraction block 23 are both μ1, and the rotor body 10 includes silicon steel sheets, and the magnetic permeability of the silicon steel sheets is μ2; wherein μ1>10*μ2.

[0073] In this embodiment, the plurality of magnetic poles 11 further include a reluctance pole 19. There are multiple reluctance poles 19 and multiple permanent magnet poles 12. The multiple permanent magnet poles 12 are spaced apart along the circumference of the rotor body 10, with a reluctance pole 19 provided between adjacent permanent magnet poles 12. The reluctance pole 19 is provided with the aforementioned magnetizing assembly 20, which has the same structure as the magnetizing assembly 20 provided on the permanent magnet pole 12.

[0074] In a specific implementation, the permanent magnet 13 is made of magnetic steel. This allows the rotor structure's local magnetic flux to be concentrated in the area with high magnetic permeability, significantly reducing the magnetic flux density in the local magnetic steel area. This is similar to having a hole in that location, but without creating an extreme state where there is no magnetic flux in that area. This enhances the motor's anti-saturation capability.

[0075] In this embodiment, the rotor body 10 is provided with a first mounting hole and a second mounting hole. The first mounting hole is used to accommodate the first magnetic block 22, and the second mounting hole is used to accommodate the second magnetic block 23. Specifically, the first mounting hole and the second mounting hole both penetrate the two axial end surfaces of the rotor body 10. This arrangement facilitates the installation of the first magnetic block 22 and the second magnetic block 23.

[0076] This application fully utilizes the magnetic conductive area of ​​the rotor structure to guide the magnetic flux to be evenly distributed in the air gap, thereby further reducing the iron loss of the motor and making the motor more energy-efficient.

[0077] The present application solves the following technical problems: solving the problem of increased motor saturation due to rotor openings; solving the problem of magnetic field asymmetry between permanent magnet poles and magnetic resistance poles caused by alternating pole structure; solving the problem of increased losses due to rotor openings; solving the problem of miniaturization of motor rotors; solving the problem of large motor torque pulsation.

[0078] By adding magnetic blocks with higher magnetic permeability (including first and second magnetic blocks) to the rotor structure, this application changes the magnetic path of the rotor structure, making the distribution of the motor's air gap magnetic field more uniform. At the same time, it increases the rotor's effective magnetic permeability area and reduces the motor's saturation, thereby reducing the motor's torque ripple and rotor iron loss. This increases the proportion of the motor's reluctance torque, saves on permanent magnets, and enables the motor to achieve a larger constant power speed regulation range.

[0079] Specifically, compared with the motor with rotor opening in the prior art, the waveform of the air gap flux density of the present application is closer to sine, such as Figure 7 As shown, Figure 7The horizontal axis represents the electrical angle of the motor, and the vertical axis represents the magnetic flux density; the torque ripple of this application is smaller, such as Figure 8 As shown; the rotor loss of this application is smaller, such as Figure 9 shown.

[0080] The present invention further provides a motor comprising a rotor structure and a stator, wherein the rotor structure is the rotor structure in the above embodiment. By providing the above rotor structure, the motor has the advantages of low permanent magnet usage, low torque ripple, and low iron loss.

[0081] Specifically, the motor is an alternating-pole motor.

[0082] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0083] The rotor structure of the present invention includes a rotor body 10 having a plurality of magnetic poles 11 spaced apart along the circumference of the rotor body 10. The rotor structure also includes a plurality of magnetic attraction assemblies 20 disposed on the rotor body 10, the magnetic attraction assemblies 20 being paired with the magnetic poles 11. The magnetic attraction assemblies 20 have a greater magnetic permeability than the rotor body 10. In the magnetic field distribution of the motor, magnetic lines of force follow paths of high permeability. By setting the magnetic permeability of the magnetic attraction assemblies 20 to be greater than that of the rotor body 10, the local magnetic lines of force of the rotor structure are concentrated in the high permeability portion, significantly reducing the magnetic flux density in the local area of ​​the rotor structure, similar to having a hole in that location, but without the extreme state of no magnetic lines of force in that location. This enhances the motor's anti-saturation capability. Furthermore, the rotor structure employs a "replacement of resistance with induction" approach to increase rotor saturation, thereby addressing the problem of increasing the rotor's outer diameter caused by traditional methods of magnetically conducting holes through holes. This allows for a smaller motor and further reduces material usage.

[0084] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0085] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0086] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A rotor structure, characterized in that: include: A rotor body (10) comprising a plurality of magnetic poles (11), wherein the plurality of magnetic poles (11) are arranged at intervals along the circumference of the rotor body (10); A plurality of magnetizing components (20) are arranged on the rotor body (10), and the magnetizing components (20) and the magnetic poles (11) are arranged in pairs; Wherein, the magnetic permeability of the magnetic attraction component (20) is greater than the magnetic permeability of the rotor body (10); The plurality of magnetic poles (11) include a permanent magnetic pole (12), the permanent magnetic pole (12) includes a mounting groove (14) for placing a permanent magnet (13), there are two mounting grooves (14), and the two mounting grooves (14) are arranged in a V-shape; The magnetic attraction assembly (20) is arranged between the two mounting slots (14), and the magnetic attraction assembly (20) comprises two magnetic attraction components (21), and the magnetic attraction components (21) and the mounting slots (14) are arranged in pairs; The magnetic attraction component (21) comprises a first magnetic attraction block (22) and a second magnetic attraction block (23), wherein the first magnetic attraction block (22) and the second magnetic attraction block (23) are both spaced apart from the mounting slots (14) arranged in pairs, and the first magnetic attraction block (22) is arranged between the second magnetic attraction block (23) and the mounting slots (14); The first magnetic block (22) has a first end and a second end that are arranged oppositely along the circumference of the rotor body (10), the first end of the first magnetic block (22) is located on a side of the second end of the first magnetic block (22) close to the mounting groove (14), the first end of the first magnetic block (22) has a first side surface (221) and a second side surface (222), the first side surface (221) and the second side surface (222) are arranged in sequence from the rotor outer side wall (15) of the rotor body (10) to the axis of the rotor body (10), and the first side surface (221) and the second side surface (222) are arranged obliquely; the second end of the first magnetic block (22) has a third side surface (223); the first magnetic block (22) also has a fourth side surface (224), one end of the fourth side surface (224) is connected to the first side surface (221), and the other end of the fourth side surface (224) is connected to the third side surface (223); The second magnetic block (23) has a first end and a second end that are arranged opposite to each other along the circumference of the rotor body (10), the second end of the second magnetic block (23) is located on a side of the first end of the second magnetic block (23) away from the first magnetic block (22), the first end of the second magnetic block (23) has a fifth side surface (231), a sixth side surface (232) and a seventh side surface (233), the fifth side surface (231), the sixth side surface (232) and the seventh side surface (233) are formed from the outer side wall (15) of the rotor to the outer side wall (15). The axis of the rotor body (10) is arranged in sequence, the fifth side surface (231) and the sixth side surface (232) are arranged at an angle, and the sixth side surface (232) and the seventh side surface (233) are arranged at an angle; the second end of the second magnetic attraction block (23) has an eighth side surface (234); the second magnetic attraction block (23) also has a ninth side surface (235), one end of the ninth side surface (235) is connected to the fifth side surface (231), and the other end of the ninth side surface (235) is connected to the eighth side surface (234); The angle between the first side surfaces (221) of the two first magnetic attraction blocks (22) of the magnetic attraction component (20) is ob; the angle between the eighth side surfaces (234) of the two second magnetic attraction blocks (23) of the magnetic attraction component (20) is oc; wherein ob≤oc≤0.75*ob.

2. The rotor structure according to claim 1, characterized in that: The two mounting grooves (14) are symmetrically arranged relative to a first symmetrical plane, and the two magnetic attraction components (21) are symmetrically arranged relative to the first symmetrical plane; wherein the first symmetrical plane is an axial cross section of the rotor body (10).

3. The rotor structure according to claim 1, characterized in that: The fourth side surface (224) and the ninth side surface (235) both coincide with a portion of the surface of the first reference cylindrical surface, and the axis of the first reference cylindrical surface coincides with the axis of the rotor body (10).

4. The rotor structure according to claim 1, characterized in that: The mounting slot (14) comprises a mounting slot body (141), a first air gap slot (142) and a second air gap slot (143); the mounting slot body (141) is used to place the permanent magnet (13); the first air gap slot (142) and the second air gap slot (143) are arranged on opposite sides of the mounting slot body (141); the first air gap slot (142) is connected to a first end of the mounting slot body (141), and the second air gap slot (143) is connected to a second end of the mounting slot body (141); The first air gap slot (142) has a first slot wall (144), a first magnetic isolation bridge (16) is formed between the first slot wall (144) and the rotor outer side wall (15) of the rotor body (10), and a second magnetic isolation bridge (17) is formed between the second air gap slots (143) of the two mounting slots (14) of the permanent magnet pole (12).

5. The rotor structure according to claim 4, characterized in that: The first air gap groove (142) has a first connecting port (40), the first connecting port (40) is connected to the mounting groove body (141), and the first air gap groove (142) also has a second groove wall (145), a third groove wall (146) and a fourth groove wall (147), from the first end of the first connecting port (40) to the second end of the first connecting port (40), the third groove wall (146), the second groove wall (145), the first groove wall (144), and the fourth groove wall (147) are arranged in sequence; the second groove wall (145) and the fourth groove wall (147) are arranged opposite to each other and are located on opposite sides of the first groove wall (144); the first connecting port (40) and the third groove wall (146) are both arranged opposite to the first groove wall (144).

6. The rotor structure according to claim 5, characterized in that: The width of the installation groove body (141) is Hm, and the width of the first groove wall (144) is g; wherein 1.5*Hm≤g≤2*Hm.

7. The rotor structure according to claim 4, characterized in that: The first magnetic attraction block (22) has a fourth side surface (224); the second magnetic attraction block (23) has a ninth side surface (235); the fourth side surface (224), the ninth side surface (235) and the first slot wall (144) all coincide with a portion of the surface of the first reference cylindrical surface; the axis of the first reference cylindrical surface coincides with the axis of the rotor body (10); the distances between the fourth side surface (224), the ninth side surface (235) and the first slot wall (144) and the outer rotor wall (15) along the radial direction of the rotor body (10) are all y; The first end of the second magnetic attraction block (23) has a fifth side surface (231) and a sixth side surface (232), the fifth side surface (231) and the sixth side surface (232) being arranged in sequence from the outer side wall (15) of the rotor to the axis of the rotor body (10), the width of the fifth side surface (231) being e1, and the width of the sixth side surface (232) being e2; Among them, e1≤y≤e2.

8. The rotor structure according to claim 5, characterized in that: The first slot wall (144) has a first edge line and a second edge line that are arranged opposite to each other along the circumference of the rotor body (10), and an angle between a plane (50) passing through the first edge line and the second edge line and the third slot wall (146) is o1; wherein o1 ≥ 30°.

9. The rotor structure according to claim 5, characterized in that: The mounting slot body (141) has a fifth slot wall (148) and a sixth slot wall (149) that are arranged opposite to each other, and the fifth slot wall (148) is located on a side of the sixth slot wall (149) away from the first magnetic attraction block (22); The first end of the first magnetic block (22) has a first side surface (221) and a second side surface (222), and the first side surface (221) and the second side surface (222) are sequentially arranged from the outer side wall (15) of the rotor to the axis of the rotor body (10); the first side surface (221) is arranged parallel to the fourth slot wall (147), and the second side surface (222) is arranged parallel to the sixth slot wall (149), and the distance between the first side surface (221) and the fourth slot wall (147) and the distance between the second side surface (222) and the sixth slot wall (149) are both L1; The permanent magnet (13) and the sixth slot wall (149) are spaced apart, and the distance between the permanent magnet (13) and the sixth slot wall (149) is air1; wherein 2*air1≤L1≤4*air1.

10. The rotor structure according to claim 5, characterized in that: The two mounting grooves (14) are symmetrically arranged relative to the first symmetry plane; the rotor body (10) includes at least one permanent magnet pole (12), and the number of the permanent magnet poles (12) is p; the second groove wall (145) and the fourth groove wall (147) are arranged in parallel, and the angle between the second groove wall (145) and the first symmetry plane is 360 / 2*p.

11. The rotor structure according to any one of claims 1 to 10, characterized in that: The rotor body (10) has a center hole (18), and the minimum distance between the center hole (18) and the mounting groove (14) is greater than the radius of the center hole (18).

12. The rotor structure according to any one of claims 1 to 10, characterized in that: The minimum magnetic permeability of the magnetic attraction component (20) is μ3, and the minimum magnetic permeability of the rotor body (10) is μ4; wherein 9*μ4≤μ3.

13. A motor comprising a rotor structure and a stator, characterized in that: The rotor structure is the rotor structure according to any one of claims 1 to 12.

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