Electric motors and electrical equipment

Abstract

The present invention provides an electric machine and an electrical equipment. The electric machine includes: a rotor assembly, which includes a rotor core and a plurality of permanent magnets. The rotor core includes: a circular ring portion; a plurality of core portions, which protrude from the inner peripheral wall of the circular ring portion and are spaced apart in the circumferential direction of the circular ring portion. The plurality of permanent magnets are respectively disposed between two adjacent core portions, and the polarities of the plurality of permanent magnets are the same; a stator assembly, which includes a stator core and a stator winding. The stator core includes: a yoke portion; stator main teeth, which are disposed on the yoke portion. The stator main teeth include tooth shoes, and the stator winding is disposed on the stator main teeth; at least two stator sub-teeth, which are disposed on the tooth shoes. In the present invention, the manufacturing difficulty of the alternating pole rotor can be reduced, and the magnetic field modulation effect is enhanced, and the amplitude of the working sub-flux density harmonic wave is increased, so that the electric machine generates better output performance.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular, to a motor and an electrical appliance device. Background Art

[0002] In the related art, the amount of permanent magnets in a permanent magnet motor is large, resulting in a high cost. Moreover, for a design with a large number of poles, the number of permanent magnet blocks is large, and the assembly process time is long, which affects the production and manufacturing efficiency. In addition, in the related art, an alternating pole structure is adopted, and all the N-pole permanent magnets or S-pole permanent magnets in the original motor are replaced with magnetic conductive cores, resulting in a significant decrease in the fundamental wave amplitude and a decline in the output performance of the motor. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0004] To this end, a first aspect of the present invention provides a motor.

[0005] A second aspect of the present invention provides an electrical appliance device.

[0006] A first aspect of the present invention provides a motor, comprising: a rotor assembly, the rotor assembly including a rotor core and a plurality of permanent magnets, the rotor core including: a circular ring portion; a plurality of core portions, the plurality of core portions protruding from the inner peripheral wall of the circular ring portion and being spaced apart in the circumferential direction of the circular ring portion, the plurality of permanent magnets being respectively disposed between adjacent two core portions, and the polarities of the plurality of permanent magnets being the same; a stator assembly, the stator assembly including a stator core and a stator winding, the stator core including: a yoke portion; stator main teeth, disposed on the yoke portion, the stator main teeth including tooth boots, and the stator winding being disposed on the stator main teeth; at least two stator sub-teeth, disposed on the tooth boots.

[0007] The motor proposed by the present invention includes a rotor assembly and a stator assembly. Among them, the rotor assembly includes a rotor core and a plurality of permanent magnets. The rotor core includes a circular ring portion and a plurality of core portions, the plurality of core portions protruding from the inner peripheral wall of the circular ring portion, and the plurality of core portions being spaced apart in the circumferential direction of the circular ring portion. The plurality of permanent magnets are respectively disposed between adjacent two core portions, and the polarities of the plurality of permanent magnets are the same. In this way, in the circumferential direction of the circular ring portion, the plurality of core portions and the plurality of permanent magnets are alternately distributed.

[0008] In particular, multiple permanent magnets with the same polarity are respectively arranged between two adjacent iron core parts, and an alternating-pole magnetic structure is generated on the circular ring part of the rotor iron core, making the rotor iron core a salient-pole structure. In this way, not only the number of permanent magnets used is reduced, but also the manufacturing difficulty of the alternating-pole rotor is reduced, and the magnetic field modulation effect is enhanced, increasing the amplitude of the working sub-flux density harmonics, resulting in better output performance of the motor. Moreover, in the present invention, multiple iron core parts and multiple permanent magnets are alternately distributed on the circular ring part of the rotor iron core, which also avoids the problem in the related art that after adopting alternating poles, the number of magnetic poles decreases, the amplitude of the magnetic field fundamental wave decreases, and the torque decreases.

[0009] Further, the stator assembly includes a stator iron core and a stator winding. In addition, the stator iron core includes a yoke part, stator main teeth, and at least two stator sub-teeth. The stator main teeth are arranged on the yoke part, and the tooth roots of the stator main teeth are connected to the yoke part, and tooth shoes are provided at the tooth tips of the stator main teeth. In addition, the stator winding is arranged on the stator main teeth, and the tooth shoes can play a certain limiting role on the stator winding to ensure that the stator winding is stably located on the stator main teeth.

[0010] In particular, at least two stator sub-teeth are provided on the tooth shoes. In addition to being a magnetic conduction component, the stator sub-teeth can also be used as a modulation component to achieve the function of magnetic field modulation. At this time, it is different from the conventional permanent magnet motor (with a small slot opening and the air-gap permeance approaching a constant) adopted in the related art. In the motor proposed in the present invention, the stator main teeth are split into at least two stator sub-teeth, introducing more harmonic components into the air-gap permeance. In this way, the performance of the motor is significantly improved. Moreover, the structure of the motor is simple, convenient for processing and manufacturing, and does not significantly increase the cost of the motor, and the motor will not have large vibrations and noises.

[0011] Therefore, an alternating-pole magnetic structure is generated on the circular ring part of the rotor iron core in the motor proposed in the present invention, and at least two stator sub-teeth are provided on the stator iron core. Furthermore, through the form of alternating poles and main and sub-teeth, the performance of the motor is significantly improved. On the one hand, the motor has better output performance, and on the other hand, the motor will not have large vibrations and noises.

[0012] In some possible designs, the number of pole pairs Ps of the stator winding = │ax ± Pr│, where a represents the number of stator main teeth, x represents the number of stator sub-teeth on each stator main tooth, and Pr represents the number of multiple permanent magnets.

[0013] In this design, the number of pole pairs Ps of the stator winding satisfies: Ps = │ax ± Pr│. Among them, a represents the number of stator main teeth, x represents the number of stator sub-teeth on each stator main tooth, and Pr represents the number of permanent magnets. The new harmonic components appearing in the air-gap magnetic density can be used as the working harmonics of the motor to provide output torque for the motor, thus effectively improving the torque density of the motor.

[0014] Therefore, in the motor proposed by the present invention, at least two stator sub-teeth are provided on the tooth shoe of the stator main tooth. Furthermore, by using the stator sub-teeth as modulation components, the function of magnetic field modulation is realized, introducing more harmonic components into the air-gap permeance, and significantly improving the performance of the motor. And, the number of pole pairs Ps of the stator winding satisfies: Ps = │ax ± Pr│. Under this limitation, the new harmonic components appearing in the air-gap magnetic density can be used as the working harmonics of the motor to provide output torque for the motor, thus effectively improving the torque density of the motor.

[0015] In some possible designs, there is a receiving portion between adjacent two iron core portions, and the permanent magnet is located within the receiving portion; wherein, in the circumferential direction of the ring portion, the size of the permanent magnet is smaller than that of the receiving portion.

[0016] In this design, multiple iron core portions are spaced apart in the circumferential direction of the ring portion, thus forming a receiving portion between adjacent two iron core portions. And, in the circumferential direction of the ring portion, the size of the permanent magnet is smaller than that of the receiving portion to ensure that the permanent magnet can be placed within the receiving portion. Designed in this way, the structure of the rotor core in the rotor assembly proposed by the present invention is simple, facilitating processing, manufacturing and assembly. In this way, on the basis of enhancing the magnetic field modulation effect, the cost of the rotor assembly can be further reduced.

[0017] In some possible designs, there is an air gap between the permanent magnet and the iron core portion in the circumferential direction of the ring portion.

[0018] In this design, in the circumferential direction of the ring portion, the size of the permanent magnet is smaller than that of the receiving portion. In this way, there is a certain air gap between the permanent magnet and the iron core portion. When the rotor assembly and the stator assembly are used in combination, more harmonic components are introduced into the air-gap permeance. When the permanent magnet magnetomotive force acts on the air-gap permeance containing harmonics, new harmonic components will appear in the air-gap magnetic density. The new harmonic components appearing in the air-gap magnetic density can be used as the working harmonics of the motor to provide output torque for the motor, thus effectively improving the torque density of the motor.

[0019] In some possible designs, in the circumferential direction of the ring portion, the size of the air gap is greater than 0 mm and less than 3 mm.

[0020] In this design, the size of the air gap affects the operation reliability of the entire rotor assembly. When the air gap is too large, the magnetic resistance will increase, thus increasing the excitation loss, reducing the magnetization effect of the permanent magnet on the iron core portion, and further unable to generate an alternating pole structure. When the air gap is too small, the air-gap harmonic magnetic field will increase, and the permanent magnet is likely to collide with the inner wall of the receiving portion during operation, thus reducing the operation reliability and also bringing difficulties to the assembly.

[0021] Therefore, the present invention optimizes the dimension of the air gap in the circumferential direction of the circular ring portion, ensuring that the dimension of the air gap in the circumferential direction of the circular ring portion is greater than 0 mm and less than 3 mm, guaranteeing the magnetization effect of the permanent magnet on the iron core portion and ensuring the reliability of the operation of the rotor assembly at the same time.

[0022] In some possible designs, an included angle γ is formed between the connection lines from the center of the circular ring portion to both ends of the permanent magnet, and 0.9 < γ / (π / (Pr)) < 1.7 is satisfied, where Pr is the number of permanent magnets.

[0023] In this design, an included angle γ is formed between the connection lines from the center of the circular ring portion to both ends of the permanent magnet. The existence of the included angle can further change the air gap permeance process, enhance the magnetic field modulation effect, increase the amplitude of the working sub - magnetic density harmonic, and further improve the torque of the motor using the rotor assembly. Thus, the problem that the number of magnetic poles decreases and the fundamental magnetic field amplitude drops, resulting in torque reduction, in traditional permanent magnet motors when using alternating poles is avoided.

[0024] Furthermore, the included angle γ between the connection lines from the center of the circular ring portion to both ends of the permanent magnet satisfies: 0.9 < γ / (π / (Pr)) < 1.7, where Pr is the number of permanent magnets. When the included angle γ satisfies the above conditions, the working performance of the rotor assembly is good.

[0025] In some possible designs, the permanent magnet includes one of the following: ferrite or rare - earth permanent magnet.

[0026] In this design, the permanent magnet can be made of ferrite, and the magnetic conductivity of rare - earth permanent magnets is better.

[0027] In this design, the permanent magnet can also be made of rare - earth permanent magnet, and the magnetism of rare - earth permanent magnets is extremely high.

[0028] In some possible designs, the rotor iron core includes a plurality of punching sheets, and the plurality of punching sheets are stacked along the axial direction of the rotor iron core. Any punching sheet includes a circular ring portion and a plurality of iron core portions.

[0029] In this design, the rotor iron core includes a plurality of punching sheets. Among them, the plurality of punching sheets are stacked along the axial direction of the rotor iron core. In addition, any one includes a circular ring portion and at least one iron core portion. In this way, during the manufacturing process of the rotor iron core, it can be manufactured by stamping layer by layer.

[0030] In some possible designs, the rotor iron core includes a plurality of segmented iron cores. Any segmented iron core includes an arc portion and at least one iron core portion. At least one iron core portion is arranged on the arc portion, and the arc portions of adjacent two segmented iron cores are connected, and a plurality of arc portions form a circular ring portion.

[0031] In this design, the rotor core includes a plurality of segmented cores, and the plurality of segmented cores are connected end to end in the circumferential direction of the stator core. Among them, any one segmented core includes an arc portion and at least one core portion, and the arc portions of two adjacent segmented cores are connected. The plurality of circular ring portions together form the above-mentioned circular ring portion. In this way, during the process of manufacturing the rotor core, the plurality of segmented cores can be connected end to end to manufacture the rotor core.

[0032] Specifically, the rotor core includes a plurality of segmented cores. In this way, during the process of manufacturing the rotor assembly, the rotor core can be first unfolded (it can be unfolded into a strip or a single segmented core). Then, permanent magnets are assembled at corresponding positions on each segmented core. In this way, compared with the prior art that requires winding operations on the integral core, the operation space of the stacked body proposed by the present invention is larger, which is beneficial to reducing the assembly difficulty of the permanent magnets, thereby improving the winding efficiency and reducing the material cost.

[0033] Moreover, based on reducing the assembly difficulty of the permanent magnets, the present invention can reduce the rejection rate during the assembly process, thereby reducing waste and increasing the cost rate of the stator core. In addition, the requirements for materials of a single segmented core are relatively low, which can improve the utilization rate of the core materials, thereby reducing the material cost of the rotor structure.

[0034] In some possible designs, the arc portions of two adjacent segmented cores are detachably connected.

[0035] In this design, the arc portions of two adjacent segmented cores are detachably connected. In this way, the disassembly and assembly of two adjacent segmented cores can be ensured.

[0036] In some possible designs, the arc portions of two adjacent segmented cores are welded.

[0037] In this design, the arc portions of two adjacent segmented cores can be connected by welding. In this way, the connection strength between two adjacent segmented cores can be ensured.

[0038] In some possible designs, the rotor core includes at least one strip-shaped core, and at least one strip-shaped core is connected end to end and distributed in a ring shape, and a plurality of core portions are arranged at intervals on at least one strip-shaped core. Specifically, any one strip-shaped core includes a plurality of strip-shaped punching sheets, and the plurality of strip-shaped punching sheets are stacked along the axial direction of the rotor core.

[0039] In this design, the rotor core includes at least one strip-shaped core, and at least one strip-shaped core is connected end to end and distributed in a ring shape. In addition, a plurality of core portions are arranged at intervals on at least one strip-shaped core. In this way, during the process of manufacturing the rotor core, at least one strip-shaped core can be connected end to end to manufacture the rotor core.

[0040] Specifically, the rotor core includes at least one strip-shaped core. In this way, during the manufacturing process of the rotor assembly, the rotor core can be first unfolded (it can be unfolded into one strip or multiple strips). Then, permanent magnets are assembled at corresponding positions on each strip-shaped core. In this way, compared with the prior art that requires winding operations on the integral core, the operation space of the stack proposed by the present invention is larger, which is beneficial to reducing the assembly difficulty of the permanent magnets, thereby improving the winding efficiency and reducing the material cost.

[0041] Moreover, on the basis of reducing the assembly difficulty of the permanent magnets, the present invention can reduce the rejection rate during the assembly process, thereby reducing waste and increasing the cost rate of the stator core. In addition, the requirements for materials of individual segmented cores are relatively low, which can improve the utilization rate of the core materials, thereby reducing the material cost of the rotor structure.

[0042] In some possible designs, the rotor core includes at least one strip-shaped core, and at least one strip-shaped core is spirally distributed along the axial direction of the rotor core, and a plurality of core parts are spaced apart on at least one strip-shaped core.

[0043] In this design, the rotor core includes at least one strip-shaped core, and at least one strip-shaped core is spirally distributed along the axial direction of the rotor core. In addition, a plurality of core parts are spaced apart on at least one strip-shaped core. In this way, during the manufacturing process of the rotor core, at least one strip-shaped core can be spirally distributed along the axial direction of the rotor core to manufacture the rotor core.

[0044] Specifically, the rotor core includes at least one strip-shaped core. In this way, during the manufacturing process of the rotor assembly, the rotor core can be first unfolded (it can be unfolded into one strip or multiple strips). Then, permanent magnets are assembled at corresponding positions on each strip-shaped core. In this way, compared with the prior art that requires winding operations on the integral core, the operation space of the stack proposed by the present invention is larger, which is beneficial to reducing the assembly difficulty of the permanent magnets, thereby improving the winding efficiency and reducing the material cost.

[0045] Moreover, on the basis of reducing the assembly difficulty of the permanent magnets, the present invention can reduce the rejection rate during the assembly process, thereby reducing waste and increasing the cost rate of the stator core. In addition, the requirements for materials of individual segmented cores are relatively low, which can improve the utilization rate of the core materials, thereby reducing the material cost of the rotor structure.

[0046] In this design, there is a stator slot between two adjacent stator main teeth, the stator winding is wound around the stator main teeth and received in the stator slot. In addition, a notch is formed between the tooth boots of two adjacent stator main teeth, and the notch is communicated with the stator slot, and the staff can wind the stator winding around the stator main teeth through the notch.

[0047] Furthermore, in the motor proposed by the present invention, each coil of the stator winding is wound around only one main stator tooth, that is, a concentrated winding structure with single-tooth winding is adopted. At this time, the end of the motor winding is smaller, which is beneficial to reducing copper loss and facilitating modularization, thereby improving the production and manufacturing efficiency.

[0048] In some possible designs, there is a groove between two adjacent secondary stator teeth; in the circumferential direction of the stator assembly, the size of the groove is not equal to the size of the slot opening.

[0049] In this design, in the circumferential direction of the stator core, the size of the slot opening is not equal to the size of the groove. Specifically, in the circumferential direction of the stator core, the size of the groove is larger than the size of the slot opening. In this way, the uniformity of the distribution of the secondary stator teeth in the circumference will be changed, that is, the number of periods of the air-gap permeance is reduced, and the working harmonics of the air-gap magnetic density are the pole pairs: |Pr±i×Zf| (i = 0, 1, 2...), where Zf is the number of periods of the air-gap permeance; when the number of periods of the air-gap permeance is reduced, the harmonic components of the magnetic density generated by modulation will increase, that is, more working harmonics will be generated, so that the output torque of the motor will be further improved.

[0050] Furthermore, the shape of the groove can be designed according to the actual situation. Specifically, the groove can be designed as a polygonal groove, an arc groove, etc. More specifically, the groove can be designed as a square groove, a trapezoidal groove, a triangular groove, or other polygonal grooves.

[0051] In some possible designs, between two adjacent secondary stator teeth, an angle β is formed between the bisector of the tooth body of one secondary stator tooth and the bisector of the tooth body of the other secondary stator tooth, and it satisfies 1≤β / (2π / (ax))<1.4, where a represents the number of main stator teeth, and x represents the number of secondary stator teeth on each main stator tooth.

[0052] In this design, between two adjacent secondary stator teeth, an angle β is formed between the bisector of the tooth body of one secondary stator tooth and the bisector of the tooth body of the other secondary stator tooth, and it satisfies 1≤β / (2π / (ax))<1.4; where a represents the number of main stator teeth, and x represents the number of secondary stator teeth on each main stator tooth. In this way, the present invention further optimizes the structure and distribution of the secondary stator teeth, so that the harmonic amplitude generated by applying this motor is larger and the torque is higher, in order to further improve the working efficiency of the motor.

[0053] Specifically, the bisector of the tooth body of the secondary stator tooth is: on the outer circle of the stator core, the connection line between the middle of the secondary stator tooth and the center of the stator core.

[0054] The second aspect of the present invention proposes an electrical equipment, including: the motor as in the first aspect of the present invention.

[0055] The electrical equipment proposed by the present invention includes a motor designed as any of the above. Therefore, it has all the beneficial effects of the above motor and will not be elaborated in detail herein.

[0056] The electrical equipment proposed by the present invention includes, but is not limited to, products such as air conditioners, refrigerators, washing machines, etc.

[0057] The additional aspects and advantages of the present invention will become apparent in the following description section or be learned through the practice of the present invention. Description of the Drawings

[0058] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, wherein:

[0059] Figure 1 is a schematic structural diagram of a rotor assembly in a motor according to an embodiment of the present invention;

[0060] Figure 2 is Figure 1 a schematic structural diagram of a rotor core in the rotor assembly shown;

[0061] Figure 3 is a schematic structural diagram of a rotor core in a motor according to an embodiment of the present invention;

[0062] Figure 4 is a schematic structural diagram of a segmented core in a motor according to an embodiment of the present invention;

[0063] Figure 5 is a schematic structural diagram of a bar-shaped core in a motor according to an embodiment of the present invention;

[0064] Figure 6 is a schematic structural diagram of a motor according to an embodiment of the present invention;

[0065] Figure 7 is Figure 6 a schematic structural diagram of a stator assembly in the motor shown;

[0066] Figure 8 A schematic structural diagram of a stator assembly in a motor according to another embodiment of the present invention.

[0067] Wherein, Figures 1 to 8 the corresponding relationship between the reference numerals and the component names in the drawings is:

[0068] 100 Rotor assembly, 102 Rotor core, 104 Ring portion, 106 Core portion, 108 Permanent magnet, 110 Receiving portion, 112 Air gap, 114 Segmented core, 116 Bar-shaped core, 200 Stator assembly, 202 Stator core, 204 Yoke portion, 206 Main stator teeth, 208 Tooth shoe, 210 Auxiliary stator teeth, 212 Stator winding, 214 Stator slots, 216 Slot openings, 218 Grooves, 220 Stacked body, 230 Yoke section, 232 First connection portion, 234 Second connection portion. Detailed implementation manners

[0069] In order to be able to more clearly understand the above objects, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

[0070] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0071] The following refers to Figures 1 to 8 to describe a motor and an electrical appliance device according to some embodiments of the present invention. Among them, Figure 7 The dotted line therein represents the bisector of the tooth body of the auxiliary stator teeth 210.

[0072] As Figure 6 shown, a first embodiment of the present invention provides a motor, including a rotor assembly 100 and a stator assembly 200.

[0073] Among them, as Figure 1 and Figure 2 shown, the rotor assembly 100 includes a rotor core 102 and a plurality of permanent magnets 108. The rotor core 102 includes a ring portion 104 and a plurality of core portions 106. The plurality of core portions 106 protrude from the inner peripheral wall of the ring portion 104, and the plurality of core portions 106 are spaced apart in the circumferential direction of the ring portion 104. The plurality of permanent magnets 108 are respectively disposed between two adjacent core portions 106, and the polarities of the plurality of permanent magnets 108 are the same. In this way, in the circumferential direction of the ring portion 104, the plurality of core portions 106 and the plurality of permanent magnets 108 are alternately distributed.

[0074] Specifically, as Figure 1 and Figure 2As shown, a plurality of permanent magnets 108 with the same polarity are respectively arranged between two adjacent iron core parts 106. An alternating pole magnetic structure is generated on the circular ring part 104 of the rotor iron core 102, making the rotor iron core 102 a salient pole structure. In this way, not only the number of permanent magnets 108 used is reduced, but also the manufacturing difficulty of the alternating pole rotor is decreased. Moreover, the magnetic field modulation effect is enhanced, and the amplitude of the working sub - magnetic density harmonic increases, enabling the motor to have better output performance.

[0075] Moreover, in the present invention, a plurality of iron core parts 106 and a plurality of permanent magnets 108 are alternately distributed on the circular ring part 104 of the rotor iron core 102, which also avoids the problem in the related art that after adopting alternating poles, the number of magnetic poles decreases, the amplitude of the magnetic field fundamental wave drops, and the torque decreases.

[0076] Furthermore, as Figure 6 and Figure 7 shown, the stator assembly 200 includes a stator iron core 202 and a stator winding 212. In addition, the stator iron core 202 includes a yoke part 204, stator main teeth 206, and at least two stator secondary teeth 210. The stator main teeth 206 are arranged on the yoke part 204, and the tooth roots of the stator main teeth 206 are connected to the yoke part 204. Tooth shoes 208 are arranged at the tooth tips of the stator main teeth 206. In addition, the stator winding 212 is arranged on the stator main teeth 206, and the tooth shoes 208 can play a certain limiting role on the stator winding 212 to ensure that the stator winding 212 is stably located on the stator main teeth 206.

[0077] Particularly, as Figure 6 and Figure 7 shown, at least two stator secondary teeth 210 are arranged on the tooth shoes 208. Besides acting as a magnetic conduction component, the stator secondary teeth 210 can also act as a modulation component to achieve the function of magnetic field modulation. At this time, it is different from the conventional permanent magnet motor (with a smaller slot opening and the air - gap permeance being close to a constant) adopted in the related art. In the motor proposed in the present invention, the stator main teeth 206 are split into at least two stator secondary teeth 210, introducing more harmonic components into the air - gap permeance. In this way, the performance of the motor is significantly improved. Moreover, the structure of the motor is simple, convenient for processing and manufacturing, and does not significantly increase the cost of the motor, nor will the motor have large vibrations and noises.

[0078] Therefore, in the motor proposed in the present invention, an alternating pole magnetic structure is generated on the circular ring part 104 of the rotor iron core 102, and at least two stator secondary teeth 210 are arranged on the stator iron core 202. Thus, through the form of alternating poles and main - secondary teeth, the performance of the motor is significantly improved. On the one hand, the motor has better output performance, and on the other hand, the motor will not have large vibrations and noises.

[0079] The second embodiment of the present invention proposes a motor, which further improves on the basis of the first embodiment:

[0080] As Figure 6 and Figure 7 shown, at least two stator secondary teeth 210 are provided on the tooth tip 208 of the stator main tooth 206. Then, by using the stator secondary teeth 210 as modulation components, the function of magnetic field modulation is realized, introducing more harmonic components into the air-gap permeance, and significantly improving the performance of the motor. Moreover, the number of pole pairs Ps of the stator winding 212 = │ax ± Pr│, where a represents the number of stator main teeth 206, x represents the number of stator secondary teeth 210 on each stator main tooth 206, and Pr represents the number of multiple permanent magnets 108.

[0081] Under this limitation, the new harmonic components appearing in the air-gap magnetic density can be used as the working harmonics of the motor to provide output torque for the motor, thus effectively improving the torque density of the motor.

[0082] The third embodiment of the present invention proposes a motor, which further improves on the basis of the first and second embodiments:

[0083] As Figure 1 and Figure 2 shown, multiple iron core parts 106 are spaced apart in the circumferential direction of the circular ring part 104, thus forming a receiving part 110 between two adjacent iron core parts 106. Moreover, in the circumferential direction of the circular ring part 104, the size of the permanent magnet 108 is smaller than that of the receiving part 110 to ensure that the permanent magnet 108 can be placed in the receiving part 110. With such a design, the structure of the rotor iron core 102 in the rotor assembly 100 proposed by the present invention is simple, facilitating processing, manufacturing, and assembly. In this way, on the basis of enhancing the magnetic field modulation effect, the cost of the rotor assembly 100 can be further reduced.

[0084] The fourth embodiment of the present invention proposes a motor, which further improves on the basis of the first, second, and third embodiments:

[0085] As Figure 1 and Figure 2 shown, in the circumferential direction of the circular ring part 104, the size of the permanent magnet 108 is smaller than that of the receiving part 110. In this way, there is a certain air gap 112 between the permanent magnet 108 and the iron core part 106. When the rotor assembly 100 and the stator assembly 200 are used in cooperation, more harmonic components are introduced into the air-gap permeance of the air gap 112.

[0086] When the permanent magnet magnetomotive force acts on the air-gap permeance containing harmonics, new harmonic components will appear in the air-gap magnetic density. The new harmonic components appearing in the air-gap magnetic density can be used as the working harmonics of the motor to provide output torque for the motor, thereby effectively improving the torque density of the motor.

[0087] In this embodiment, further, as Figure 1 shown, the size of the air gap 112 affects the operation reliability of the entire rotor assembly 100. When the air gap 112 is too large, the magnetic resistance will increase, thereby increasing the excitation loss, reducing the magnetization effect of the permanent magnet 108 on the iron core portion 106, and further unable to generate an alternating pole structure. When the air gap 112 is too small, the harmonic magnetic field of the air gap 112 will increase, and the permanent magnet 108 is likely to collide with the inner wall of the accommodating portion 110 during operation, thereby reducing the operation reliability and also causing difficulties in assembly.

[0088] Therefore, the present invention optimizes the dimension d1 of the air gap 112 in the circumferential direction of the circular ring portion 104, ensuring that the dimension d1 of the air gap 112 in the circumferential direction of the circular ring portion 104 is greater than 0 mm and less than 3 mm, ensuring the magnetization effect of the permanent magnet 108 on the iron core portion 106, and at the same time ensuring the operation reliability of the rotor assembly 100.

[0089] Specifically, the dimension d1 of the air gap 112 in the circumferential direction of the circular ring portion 104 can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 2.8 mm, etc., and those skilled in the art can design according to actual needs.

[0090] The fifth embodiment of the present invention proposes a rotor assembly 100. On the basis of the first embodiment, the second embodiment, the third embodiment and the fourth embodiment, further:

[0091] As Figure 1 shown, an included angle γ is formed between the center of the circular ring portion 104 and the connection lines at both ends of the permanent magnet 108. The existence of the included angle can further change the air-gap permeance process, enhance the magnetic field modulation effect, increase the amplitude of the working sub-magnetic density harmonics, and further improve the torque of the motor using the rotor assembly 100. Thereby, it also avoids the problem that in a traditional permanent magnet motor, after using alternating poles, the number of magnetic poles decreases and the amplitude of the magnetic field fundamental wave decreases, resulting in a torque decrease.

[0092] Further, as Figure 1 shown, the included angle γ between the center of the circular ring portion 104 and the connection lines at both ends of the permanent magnet 108 satisfies: 0.9 < γ / (π / (Pr)) < 1.7, where Pr is the number of permanent magnets 108. When the included angle γ satisfies the above conditions, the working performance of the rotor assembly 100 is good.

[0093] Based on the first to fifth embodiments, further, the permanent magnet 108 can be made of ferrite, and the rare earth permanent magnet 108 has good magnetic conductivity.

[0094] Based on the first to fifth embodiments, further, the permanent magnet 108 can also be a rare earth permanent magnet 108, and the rare earth permanent magnet 108 has extremely high magnetism.

[0095] Based on the first to fifth embodiments, further, the rotor core 102 includes a plurality of laminations. Among them, the plurality of laminations are stacked along the axial direction of the rotor core 102. In addition, any one includes a circular ring portion 104 and at least one core portion 106. In this way, during the manufacturing process of the rotor core 102, it can be manufactured by stamping layer by layer.

[0096] Based on the first to fifth embodiments, further, as Figure 3 and Figure 4 shown, the rotor core 102 includes a plurality of segmented cores 114, and the plurality of segmented cores 114 are connected end to end along the circumferential direction of the stator core 202. Among them, any one of the segmented cores 114 includes an arc portion and at least one core portion 106, and the arc portions of two adjacent segmented cores 114 are connected, and the plurality of circular ring portions 104 together form the above-mentioned circular ring portion 104. In this way, during the manufacturing process of the rotor core 102, the rotor core 102 can be manufactured by connecting a plurality of segmented cores 114 end to end.

[0097] Specifically, as Figure 3 and Figure 4 shown, the rotor core 102 includes a plurality of segmented cores 114. In this way, during the manufacturing process of the rotor assembly 100, the rotor core 102 can be first unfolded (it can be unfolded into a strip or a single segmented core 114). Then, the permanent magnet 108 is assembled at the corresponding position on each segmented core 114. In this way, compared with the need to wind wires on the overall core in the related art, the operation space of the stacked body proposed by the present invention is larger, which is beneficial to reducing the assembly difficulty of the permanent magnet 108, thereby improving the winding efficiency and reducing the material cost.

[0098] Moreover, based on reducing the assembly difficulty of the permanent magnet 108, the present invention can reduce the scrap rate during the assembly process, thereby reducing waste and increasing the cost rate of the stator core. In addition, the requirements for materials of a single segmented core 114 are relatively low, which can improve the utilization rate of the core material, thereby reducing the material cost of the rotor structure.

[0099] Further, as Figure 3 and Figure 4As shown, the arc portions of two adjacent segmented iron cores 114 are detachably connected. In this way, the disassembly and assembly of two adjacent segmented iron cores 114 can be ensured. In addition, the arc portions of two adjacent segmented iron cores 114 can also be connected by welding. In this way, the connection strength between two adjacent segmented iron cores 114 can be ensured.

[0100] Based on the first to fifth embodiments, further, as Figure 5 shown, the rotor iron core 102 includes at least one strip-shaped iron core 116, and at least one strip-shaped iron core 116 is connected end to end and distributed in a ring shape. In addition, a plurality of iron core portions 106 are arranged at intervals on at least one strip-shaped iron core 116. In this way, during the manufacturing process of the rotor iron core 102, at least one strip-shaped iron core 116 can be connected end to end to manufacture the rotor iron core 102.

[0101] Specifically, as Figure 5 shown, the rotor iron core 102 includes at least one strip-shaped iron core 116. In this way, during the manufacturing process of the rotor assembly 100, the rotor iron core 102 can be first unfolded (it can be unfolded into one strip or multiple strips). Then, the permanent magnets 108 are assembled at corresponding positions on each strip-shaped iron core 116. In this way, compared with the need to wind wires on the overall iron core in the related art, the operation space of the stacked body proposed by the present invention is larger, which is beneficial to reducing the assembly difficulty of the permanent magnets 108, thereby improving the winding efficiency and reducing the material cost.

[0102] Moreover, based on reducing the assembly difficulty of the permanent magnets 108, the present invention can reduce the scrap rate during the assembly process, thereby reducing waste and increasing the cost rate of the stator iron core. In addition, the requirements for materials of a single segmented iron core 114 are relatively low, which can improve the utilization rate of the iron core material, thereby reducing the material cost of the rotor structure.

[0103] Based on the first to fifth embodiments, further, as Figure 5 shown, the rotor iron core 102 includes at least one strip-shaped iron core 116, and at least one strip-shaped iron core 116 is spirally distributed along the axial direction of the rotor iron core 102. In addition, a plurality of iron core portions 106 are arranged at intervals on at least one strip-shaped iron core 116. In this way, during the manufacturing process of the rotor iron core 102, at least one strip-shaped iron core 116 can be spirally distributed along the axial direction of the rotor iron core 102 to manufacture the rotor iron core 102.

[0104] Specifically, as Figure 5As shown, the rotor core 102 includes at least one strip-shaped core 116. In this way, during the manufacturing process of the rotor assembly 100, the rotor core 102 can be first unfolded (it can be unfolded into one strip or multiple strips). Then, the permanent magnets 108 are assembled at corresponding positions on each strip-shaped core 116. In this way, compared with the prior art where winding operations need to be performed on the integral core, the operation space of the stack proposed by the present invention is larger, which is conducive to reducing the assembly difficulty of the permanent magnets 108, thereby improving the winding efficiency and reducing the material cost.

[0105] Moreover, based on reducing the assembly difficulty of the permanent magnets 108, the present invention can reduce the scrap rate during the assembly process, thereby reducing waste and increasing the cost rate of the stator core. In addition, the individual segmented cores 114 have lower requirements for materials, which can improve the utilization rate of the core materials, thereby reducing the material cost of the rotor structure.

[0106] The sixth embodiment of the present invention proposes a motor. On the basis of the first embodiment, the second embodiment, the third embodiment, the fourth embodiment, and the fifth embodiment, further:

[0107] As Figure 7 shown, there is a stator slot 214 between two adjacent stator main teeth 206. The stator winding 212 is wound around the stator main teeth 206 and received in the stator slot 214. In addition, a notch 216 is formed between the tooth boots 208 of two adjacent stator main teeth 206. The notch 216 is communicated with the stator slot 214, and the staff can wind the stator winding 212 around the stator main teeth 206 through the notch 216.

[0108] Furthermore, in the motor proposed by the present invention, as Figure 6 shown, each coil of the stator winding 212 is only wound around one stator main tooth 206, that is, a concentrated winding structure with single-tooth winding is adopted. At this time, the end part of the motor winding is smaller, which is conducive to reducing copper loss and is convenient for modularization, improving the production and manufacturing efficiency.

[0109] The seventh embodiment of the present invention proposes a motor. On the basis of the sixth embodiment, further:

[0110] In the circumferential direction of the stator core, as Figure 7As shown, the dimension d3 of the notch 216 is not equal to the dimension d2 of the groove 218. Specifically, in the circumferential direction of the stator core, the dimension d2 of the groove 218 is greater than the dimension d3 of the notch 216. In this way, the uniformity of the distribution of the secondary stator teeth 210 in the circumferential direction is changed, that is, the number of periods of the air-gap 112 permeance is reduced. And the working harmonics of the air-gap magnetic density have pole-pairs of: |Pr±i×Zf| (i = 0, 1, 2...), where Zf is the number of periods of the air-gap 112 permeance; when the number of periods of the air-gap 112 permeance is reduced, the harmonic components of the magnetic density generated by modulation will increase, that is, more working harmonics will be generated, so that the output torque of the motor will be further improved.

[0111] Furthermore, as Figure 7 shown, the shape of the groove 218 can be designed according to the actual situation. Specifically, the groove 218 can be designed as a polygonal groove, an arc groove, etc. More specifically, the groove 218 can be designed as a square groove, a trapezoidal groove, a triangular groove, or other polygonal grooves.

[0112] The eighth embodiment of the present invention proposes a motor. On the basis of the first embodiment, the second embodiment, the third embodiment, the fourth embodiment, the fifth embodiment, the sixth embodiment, and the seventh embodiment, further:

[0113] As Figure 7 shown, between two adjacent secondary stator teeth 210, an included angle β is formed between the bisector of the tooth body of one secondary stator tooth 210 and the bisector of the tooth body of the other secondary stator tooth 210, and it satisfies 1≤β / (2π / (ax))<1.4; where a represents the number of primary stator teeth 206, and x represents the number of secondary stator teeth 210 on each primary stator tooth 206. In this way, the present invention further optimizes the structure and distribution of the secondary stator teeth 210, so that the harmonic amplitude generated by applying this motor is larger and the torque is higher, in order to further improve the working efficiency of the motor.

[0114] The ninth embodiment of the present invention proposes an electrical equipment, including: a motor as in any of the above embodiments.

[0115] The electrical equipment proposed by the present invention includes a motor as in any of the above embodiments. Therefore, it has all the beneficial effects of the above motor, and will not be elaborated in detail here.

[0116] The electrical equipment proposed by the present invention includes but is not limited to products such as air conditioners, refrigerators, washing machines, etc.

[0117] The tenth embodiment of the present invention proposes a motor, which generates and utilizes more working harmonics through the magnetic field modulation principle, thereby improving the output torque of the motor, enhancing the performance of the motor, and further improving the magnetic density harmonic components and the output capacity of the motor through the alternate pole design. At the same time, the amount of permanent magnet 108 is reduced, and the cost is lowered.

[0118] In this embodiment, as Figure 6 shown, the motor includes a rotor assembly 100 and a rotor assembly 100, and the rotor assembly 100 and the rotor assembly 100 are concentrically arranged. Among them, the rotor assembly 100 includes a rotor core 102 and a plurality of permanent magnets 108. The rotor core 102 includes an annular portion 104 and a plurality of core portions 106. The plurality of core portions 106 are spaced apart in the circumferential direction of the annular portion 104. The plurality of permanent magnets 108 are respectively disposed between two adjacent core portions 106, and the polarities of the plurality of permanent magnets 108 are the same. In this way, in the circumferential direction of the annular portion 104, the plurality of core portions 106 and the plurality of permanent magnets 108 are alternately distributed.

[0119] In addition, as Figure 7 shown, the stator core 202 includes: a yoke portion 204, a stator main tooth 206, and at least two stator sub-teeth 210; the stator winding 212 is disposed on the stator main tooth 206; specifically, the stator winding 212 includes a plurality of coils, and each coil is wound only on one stator main tooth 206. There is a stator slot 214 between two adjacent stator main teeth 206, and there is a slot opening 216 between two adjacent tooth boots 208. The slot opening 216 is communicated with the stator slot 214, and the stator winding 212 is located in the stator slot 214; there is a groove 218 between two adjacent stator sub-teeth 210.

[0120] Through the above design, in addition to acting as a magnetic conduction component, the stator sub-teeth 210 on the tooth boot 208 can also act as a modulation component to achieve the function of magnetic field modulation. At this time, different from the conventional permanent magnet motor, in the motor of the present invention, the tooth boot 208 of the stator main tooth 206 is split into a plurality of stator sub-teeth 210, and a relatively large groove 218 is formed between two adjacent stator sub-teeth 210, so that more harmonic components are introduced into the air-gap permeance 112. When the permanent magnet magnetomotive force acts on the air-gap permeance 112 containing harmonics, new harmonic components will appear in the air-gap magnetic density.

[0121] In this embodiment, further, the pole number Ps of the stator winding 212 = │ax ± Pr│, where a represents the number of stator main teeth 206, x represents the number of stator sub-teeth 210 on each stator main tooth 206, and Pr represents the number of the plurality of permanent magnets 108. At this time, the new harmonic components appearing in the air-gap magnetic density can be used as the working harmonics of the motor to provide output torque for the motor, thereby effectively enhancing the torque density of the motor.

[0122] Moreover, in the present invention, each coil of the stator winding 212 is wound around only one main stator tooth 206, that is, a concentrated winding structure with single-tooth winding is adopted. At this time, the end of the motor winding is smaller, which is beneficial to reducing copper loss and facilitating modularization, thereby improving the production and manufacturing efficiency.

[0123] In this embodiment, further, as Figure 8 shown, the stator core 202 includes at least two stacked bodies 220, and the stator core 202 is manufactured by stacking at least two stacked bodies 220. In this way, during the processing and manufacturing of the stator core 202, workers can first perform operations such as winding on a single stacked body 220. Compared with the prior art where winding operations need to be performed on the overall iron core, the operation space of the stacked body 220 proposed in the present invention is larger, which is beneficial to reducing the winding difficulty, thereby improving the winding work efficiency and reducing the material cost.

[0124] In addition, as Figure 8 shown, the present invention can first perform operations such as winding on a single stacked body 220, which can effectively increase the number of windings of the stator winding, improve the slot fill factor of the stator winding, and improve the output performance of the applied motor. Moreover, based on reducing the winding difficulty, the present invention can reduce the scrap rate during the winding process, thereby reducing waste and increasing the cost rate of the stator core 202. In addition, the individual stacked body 220 has lower requirements for materials, which can improve the utilization rate of the iron core material, thereby reducing the material cost of the stator core 202.

[0125] Specifically, as Figure 8 shown, the stator core 202 further includes a first connecting portion 232 and a second connecting portion 234. Among them, the first connecting portion 232 is provided at the first end of the yoke section 230, the first connecting portion 232 is provided at the second end of the yoke section 230, and the first end and the second end are oppositely arranged on the yoke section 230. Moreover, the structures of the first connecting portion 232 and the second connecting portion 234 are matched, and the first connecting portion 232 and the second connecting portion 234 can cooperate to achieve self-locking. Therefore, during the process of splicing the stacked bodies 220, the present invention can connect two adjacent stacked bodies 220 through the first connecting portion 232 and the second connecting portion 234, including the detachable connection of two adjacent stacked bodies 220.

[0126] In this embodiment, further, as Figure 8 shown, one of the first connecting portion 232 and the second connecting portion 234 is a convex portion, and the other is a concave portion. In addition, the shape of the convex portion is adapted to the shape of the concave portion, and the convex portion and the concave portion can be detachably connected and have a self-locking function. Specifically, the concave portion includes, but is not limited to, the following structures: polygonal groove, circular groove, elliptical groove; the shape of the convex portion is matched with the shape of the concave portion.

[0127] In this embodiment, further, the stator core 202 further includes a fixing member. Among them. After the splicing of two adjacent stacked bodies 220 is completed, the present invention further fixes the overall structure through the fixing member, thereby further improving the structural stability of the stacked body 220 after splicing. Specifically, the fixing member can adopt an insulating frame, so that on the basis of ensuring insulation, the insulating frame can also fix the stacked body 220, realizing the multi-purpose of the insulating frame.

[0128] In this embodiment, further, as Figure 1 and Figure 2 shown, the rotor assembly 100 adopts an alternating pole structure, which can reduce the amount of permanent magnets 108 and lower the cost of the motor. On the other hand, after adopting the alternating poles, the rotor core 102 is a salient pole structure, the magnetic conductance of the air gap 112 further changes, the magnetic field modulation effect is enhanced, the amplitude of the working sub-magnetic density harmonic increases, and the motor torque is further improved. This also avoids the problem that in traditional permanent magnet motors, after adopting alternating poles, the number of magnetic poles decreases and the amplitude of the fundamental magnetic field decreases, resulting in a decrease in torque.

[0129] In this embodiment, further, an angle γ is formed between the center of the ring portion 104 and the connection lines at both ends of the permanent magnet 108, and 0.9 < γ / (π / (Pr)) < 1.7 is satisfied, where Pr is the number of permanent magnets 108. In this way, the magnetic field modulation effect is further enhanced, the amplitude of the working sub-magnetic density harmonic increases, and further the torque of the motor adopting the rotor assembly 100 is further improved. This also avoids the problem that in traditional permanent magnet motors, after adopting alternating poles, the number of magnetic poles decreases and the amplitude of the fundamental magnetic field decreases, resulting in a decrease in torque.

[0130] In this embodiment, further, in the circumferential direction of the ring portion 104, there is an air gap 112 between the permanent magnet 108 and the iron core portion 106; and, the dimension d1 of the air gap 112 in the circumferential direction of the ring portion 104 is greater than 0 mm and less than 3 mm, which ensures the magnetization effect of the permanent magnet 108 on the iron core portion 106 and at the same time ensures the reliability of the operation of the rotor assembly 100. At this time, the output performance of the motor is relatively good.

[0131] In this embodiment, further, the material of the permanent magnet 108 can be ferrite or rare earth permanent magnet. Specifically, the permanent magnet 108 can adopt ferrite, and the rare earth permanent magnet 108 has good magnetic conductivity. Specifically, the permanent magnet 108 can also adopt the rare earth permanent magnet 108, and the rare earth permanent magnet 108 has extremely high magnetism.

[0132] In this embodiment, further, the rotor core 102 can include a plurality of punching sheets, and the punching sheets are stacked along the axial direction of the rotor core 102, and any one includes a ring portion 104 and at least one iron core portion 106.

[0133] In this embodiment, further, the rotor core 102 may include a plurality of segmented cores 114, and the plurality of segmented cores 114 are connected end to end along the circumferential direction of the stator core 202. Wherein, any one of the segmented cores 114 includes an arc portion and at least one core portion 106, and the arc portions of two adjacent segmented cores 114 are connected, and the plurality of ring portions 104 together form the above-mentioned ring portion 104.

[0134] In this embodiment, further, the rotor core 102 may include at least one strip-shaped core 116, and the at least one strip-shaped core 116 is connected end to end and distributed in a ring shape, and a plurality of core portions 106 are arranged at intervals on the at least one strip-shaped core 116. Specifically, any one of the strip-shaped cores 116 includes a plurality of strip-shaped punched sheets, and the plurality of strip-shaped punched sheets are stacked along the axial direction of the rotor core 102.

[0135] In this embodiment, further, the rotor core 102 may include one strip-shaped core 116, and the at least one strip-shaped core 116 is connected end to end and distributed in a ring shape. In addition, a plurality of core portions 106 are arranged at intervals on the at least one strip-shaped core 116.

[0136] In this embodiment, further, there is a groove 218 between two adjacent stator sub-teeth 210; in the circumferential direction of the stator assembly 200, the size d2 of the groove 218 is not equal to the size d3 of the slot opening 216. In this way, the uniformity of the distribution of the stator sub-teeth 210 in the circumferential direction is changed, that is, the number of periods of the air-gap 112 permeance is reduced, and the working harmonics of the air-gap magnetic density are each with a pole-pair number of: |Pr±i×Zf| (i = 0, 1, 2...), Zf is the number of periods of the air-gap 112 permeance; when the number of periods of the air-gap 112 permeance is reduced, the modulated magnetic density harmonic components will increase, that is, more working harmonics will be generated, so that the output torque of the motor will be further improved.

[0137] In this embodiment, further, between two adjacent stator sub-teeth 210, an included angle β is formed between the bisector of the tooth body of one stator sub-tooth 210 and the bisector of the tooth body of the other stator sub-tooth 210, and 1≤β / (2π / (ax))<1.4 is satisfied; where a represents the number of stator main teeth 206, and x represents the number of stator sub-teeth 210 on each stator main tooth 206. In this way, the present invention further optimizes the structure and distribution of the stator sub-teeth 210, so that the harmonic amplitude generated by applying this motor is larger and the torque is higher, so as to further improve the working efficiency of the motor.

[0138] Therefore, in the motor proposed by the invention, a plurality of permanent magnets 108 with the same polarity are respectively arranged between two adjacent iron core portions 106. In this way, not only the number of permanent magnets 108 used is reduced, the manufacturing difficulty of the alternating pole rotor is reduced, but also the magnetic field modulation effect is enhanced, the amplitude of the working sub - magnetic density harmonic wave increases, and the motor generates better output performance. Moreover, in the present invention, a plurality of iron core portions 106 and a plurality of permanent magnets 108 are alternately distributed on the circular ring portion 104 of the rotor core 102, which also avoids the problem in the related art that after adopting the alternating poles, the number of magnetic poles decreases, the amplitude of the magnetic field fundamental wave decreases, and the torque decreases.

[0139] Moreover, at least two stator sub - teeth 210 are arranged on the tooth boot 208. In addition to being a magnetic conduction component, the stator sub - teeth 210 can also be used as a modulation component to achieve the effect of magnetic field modulation. At this time, it is different from the conventional permanent magnet motor (with a smaller slot opening and the air - gap 112 permeance being close to a constant) adopted in the related art. In the motor proposed by the present invention, the stator main teeth 206 are split into at least two stator sub - teeth 210, so that more harmonic components are introduced into the air - gap 112 permeance. In this way, the performance of the motor is significantly improved. Moreover, the structure of the motor is simple, convenient for processing and manufacturing, does not significantly increase the cost of the motor, and the motor will not have large vibration and noise.

[0140] Moreover, the number of pole pairs Ps of the stator winding 212 satisfies: Ps = │ax ± Pr│. Wherein, a represents the number of stator main teeth 206, x represents the number of stator sub - teeth 210 on each stator main tooth 206, and Pr represents the number of permanent magnets 108. Under this limitation, the new harmonic components appearing in the air - gap magnetic density can be used as the working harmonics of the motor to provide output torque for the motor, thereby effectively improving the torque density of the motor.

[0141] In the description of the present invention, the term "a plurality of" means two or more unless otherwise clearly defined. The orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present invention; terms such as "connection", "installation", "fixation", etc. should all be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0142] In the description of this specification, the descriptions of the terms "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0143] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A motor, characterized in that, comprising: a rotor assembly, the rotor assembly comprising a rotor core and a plurality of permanent magnets, the rotor core comprising: a ring portion; a plurality of core portions, the plurality of core portions protruding from the inner peripheral wall of the ring portion and being spaced apart in the circumferential direction of the ring portion, the plurality of permanent magnets being respectively disposed between two adjacent core portions, and the polarities of the plurality of permanent magnets being the same; a stator assembly, the stator assembly comprising a stator core and a stator winding, the stator core comprising: a yoke portion; stator main teeth, disposed on the yoke portion, the stator main teeth comprising tooth shoes, and the stator winding being disposed on the stator main teeth; at least two stator sub-teeth, disposed on the tooth shoes; wherein, there is a notch between two adjacent tooth shoes, and there is a groove between two adjacent stator sub-teeth; in the circumferential direction of the stator assembly, the size of the groove is not equal to the size of the notch, and the size of the groove is greater than the size of the notch; among two adjacent stator sub-teeth, an included angle β is formed between the bisector of the tooth body of one stator sub-tooth and the bisector of the tooth body of the other stator sub-tooth, and 1 ≤ β / (2π / (ax)) < 1.4 is satisfied, where a represents the number of stator main teeth, and x represents the number of stator sub-teeth on each stator main tooth.

2. The motor according to claim 1, characterized in that, the number of pole pairs Ps of the stator winding = │ax ± Pr│, where a represents the number of stator main teeth, x represents the number of stator sub-teeth on each stator main tooth, and Pr represents the number of the plurality of permanent magnets.

3. The motor according to claim 1, characterized in that, there is a receiving portion between two adjacent core portions, and the permanent magnet is located in the receiving portion; wherein, in the circumferential direction of the ring portion, the size of the permanent magnet is smaller than the size of the receiving portion.

4. The motor according to claim 1, characterized in that, there is an air gap between the permanent magnet and the core portion in the circumferential direction of the ring portion.

5. The motor according to claim 4, characterized in that, in the circumferential direction of the ring portion, the size of the air gap is greater than 0 mm and less than 3 mm.

6. The motor according to any one of claims 1 to 5, characterized in that, an included angle γ is formed between the center of the ring portion and the connection lines at both ends of the permanent magnet, and 0.9 < γ / (π / (Pr)) < 1.7 is satisfied, where Pr is the number of permanent magnets.

7. The motor according to any one of claims 1 to 5, characterized in that, the permanent magnet comprises one of the following: ferrite or rare earth permanent magnet.

8. The motor according to any one of claims 1 to 5, characterized in that, the rotor core comprises a plurality of punching sheets, the plurality of punching sheets are stacked along the axial direction of the rotor core, and any one of the punching sheets comprises the ring portion and at least one core portion.

9. The motor according to any one of claims 1 to 5, characterized in that, the rotor core comprises a plurality of segmented cores; Any one of the segmented iron cores includes an arc portion and at least one iron core portion, at least one iron core portion is disposed on the arc portion, the arc portions of two adjacent segmented iron cores are connected, and a plurality of the arc portions form the ring portion.

10. The motor according to claim 9, wherein, the arc portions of two adjacent segmented iron cores are detachably connected; or the arc portions of two adjacent segmented iron cores are welded.

11. The motor according to any one of claims 1 to 5, wherein, the rotor iron core includes at least one strip-shaped iron core, at least one strip-shaped iron core is connected end to end and distributed in a ring shape, and a plurality of the iron core portions are spaced apart on at least one strip-shaped iron core.

12. The motor according to any one of claims 1 to 5, wherein, the rotor iron core includes at least one strip-shaped iron core; at least one strip-shaped iron core is spirally distributed along the axial direction of the rotor iron core, and a plurality of the iron core portions are spaced apart on at least one strip-shaped iron core.

13. The motor according to any one of claims 1 to 5, wherein, a stator slot is provided between two adjacent stator main teeth, the slot opening is communicated with the stator slot, and the stator winding is located in the stator slot.

14. An electrical equipment, wherein, it includes: a motor according to any one of claims 1 to 13.

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