Rotor assemblies, motors and electrical equipment

Abstract

The present invention proposes a rotor assembly, a motor and an electrical device. The rotor assembly includes: a magnetic hub frame, the magnetic hub frame includes an end cover and an annular yoke, the end cover is connected to one axial end of the annular yoke, the inner circumferential wall of the annular yoke is provided with a plurality of accommodating parts, and the plurality of accommodating parts are distributed along the circumferential direction of the annular yoke; a plurality of permanent magnets are respectively arranged in the plurality of accommodating parts, and the polarities of the plurality of permanent magnets are the same. Through the rotor assembly of the present invention, the annular yoke and the end cover connected to one axial end of the annular yoke improve the overall structural strength of the magnetic hub frame; the inner circumferential wall of the annular yoke is provided with a plurality of accommodating parts, and a plurality of permanent magnets with the same polarity are arranged in the plurality of accommodating parts, and an alternating pole magnetic structure is generated on the annular yoke, thereby reducing the number of permanent magnets used and the difficulty of manufacturing the alternating pole rotor, and enhancing the magnetic field modulation effect and increasing the amplitude of the working sub-magnetic flux density harmonics.

Description

Technical Field

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

[0002] Permanent magnet motors in the prior art use a large number of permanent magnets, resulting in high costs. Furthermore, designs with a larger number of poles require a larger number of permanent magnets, resulting in a lengthy assembly process and impacting manufacturing efficiency. Furthermore, the prior art utilizes an alternating pole structure, replacing all north-pole or south-pole permanent magnets in the original motor with magnetically conductive cores. This significantly reduces the fundamental wave amplitude and thus the motor's output performance. 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 rotor assembly.

[0005] A second aspect of the present invention provides an electric motor.

[0006] Another aspect of the present invention provides an electrical device.

[0007] A first aspect of the present invention provides a rotor assembly, comprising: a magnetic hub frame, the magnetic hub frame including an end cover portion and an annular yoke portion, the end cover portion being connected to one axial end of the annular yoke portion, the inner circumferential wall of the annular yoke portion being provided with a plurality of accommodating portions, the plurality of accommodating portions being distributed along the circumferential direction of the annular yoke portion; a plurality of permanent magnets being respectively arranged in the plurality of accommodating portions, the plurality of permanent magnets having the same polarity.

[0008] The rotor assembly proposed in the present invention includes a magnetically conductive hub frame and multiple permanent magnets. The magnetically conductive hub frame comprises an end cap portion and an annular yoke portion, which are connected to each other. The end cap portion is connected to one axial end of the annular yoke portion, and the inner circumferential wall of the annular yoke is provided with multiple accommodating portions, distributed along the circumference of the annular yoke portion. Multiple permanent magnets are respectively disposed within the multiple accommodating portions. Furthermore, the multiple permanent magnets in the rotor assembly proposed in the present invention have the same polarity. Specifically, in the rotor assembly proposed in the present invention, the magnetically conductive hub frame is manufactured from a magnetically conductive material.

[0009] In particular, the rotor assembly proposed in the present invention comprises a magnetically conductive hub frame comprising a connected end cap portion and an annular yoke portion, resulting in a simple overall structure. Furthermore, the present invention provides multiple accommodating portions directly on the inner circumferential wall of the annular yoke portion, ensuring that the multiple accommodating portions are distributed along the circumference of the annular yoke portion.

[0010] In this way, after multiple permanent magnets with the same polarity are respectively assembled into multiple accommodating portions, firstly, effective installation and positioning of the multiple permanent magnets can be ensured, and secondly, the multiple permanent magnets with the same polarity can be ensured to be spaced apart in the circumferential direction of the annular yoke.

[0011] Therefore, the magnetic hub frame in the rotor assembly proposed in the present invention includes an annular yoke and an end cover connected to one axial end of the annular yoke, thereby improving the overall structural strength of the magnetic hub frame; the inner circumferential wall of the annular yoke is provided with multiple accommodating portions, and the multiple accommodating portions are distributed along the circumferential direction of the annular yoke. Multiple permanent magnets with the same polarity are arranged in the multiple accommodating portions, and an alternating pole magnetic structure is generated on the annular yoke, thereby reducing the number of permanent magnets used and the manufacturing difficulty of the alternating-stage rotor, and enhancing the magnetic field modulation effect, increasing the amplitude of the working sub-magnetic flux density harmonics, and producing better output performance.

[0012] In some possible designs, the magnetic hub frame further includes: a protrusion, which is provided on the inner peripheral wall of the annular yoke and protrudes toward the middle of the annular yoke, and the accommodating portion is located between two adjacent protrusions.

[0013] In this design, the magnetic hub frame also includes protrusions. These protrusions are located on the inner circumferential wall of the annular yoke and project toward the center of the annular yoke. Accommodations are formed between adjacent protrusions. Based on this, the present invention places multiple permanent magnets of the same polarity within these multiple accommodations. This arrangement results in alternating protrusions and permanent magnets around the circumference of the annular yoke, forming an alternating-pole structure.

[0014] This design effectively reduces the manufacturing difficulty of alternating-pole rotors in related technologies. Furthermore, the rotor assembly, combined with the stator and rotor magnetic field pole pair design, utilizes magnetic field harmonics to operate, avoiding the output performance degradation caused by the decrease in the fundamental magnetic field amplitude after adopting alternating poles.

[0015] Specifically, in related technologies, the use of an alternating-pole structure reduces the number of magnetic poles, decreases the fundamental amplitude of the air gap magnetic field, and reduces motor output performance. The present invention utilizes a magnetic field modulation motor structure, applying the rotor assembly proposed in the present invention to a magnetic field modulation motor, utilizing harmonics to operate. The salient-pole rotor enhances the modulation effect, increases the operating harmonic content, and thus improves motor output performance. This avoids the problem of decreased fundamental amplitude associated with the alternating-pole structure, which can lead to reduced motor performance.

[0016] In some possible designs, the thickness of the projection is equal to the thickness of the annular yoke.

[0017] In this design, the thickness of the protrusion is equal to that of the annular yoke, allowing the protrusion and the annular yoke to be drawn from the same sheet material, simplifying the structure and reducing manufacturing difficulty. Furthermore, this arrangement enhances the overall structural strength of the magnetic hub frame, extending its service life.

[0018] In some possible designs, the number of permanent magnets is equal to the number of protrusions.

[0019] In this design, the number of permanent magnets is equal to the number of protrusions. This ensures that the protrusions and permanent magnets are alternately distributed while ensuring that each permanent magnet can be placed within the accommodating portion. Furthermore, the equal number of permanent magnets and protrusions simplifies the structure of the magnetic hub frame, reduces the difficulty of manufacturing the magnetic hub frame, and thus improves its processing efficiency.

[0020] Furthermore, the number of accommodating portions for accommodating permanent magnets is also consistent with the number of protruding portions, so that the annular yoke can be stretch-formed using an integral sheet material, which has a simple structure, reduced manufacturing difficulty, and high rotor structural strength.

[0021] In some possible designs, the end cap portion and the annular yoke portion are an integral structure.

[0022] In this design, the end cap and annular yoke are integrated into one piece, eliminating the need for additional fittings to connect them, thus reducing assembly difficulty. Furthermore, the integrated end cap and annular yoke provide greater structural strength and a longer service life.

[0023] In some possible designs, an air gap exists between the permanent magnet and the inner wall of the receiving portion in the circumferential direction of the annular yoke.

[0024] In this design, an air gap exists between the permanent magnets and the inner wall of the housing along the circumference of the annular yoke. This air gap effectively reduces magnetic flux leakage between the permanent magnets and the inner wall of the housing, effectively magnetizing the protrusions. Furthermore, the air gap reduces assembly complexity, thereby improving the reliability of the rotor assembly.

[0025] In some possible designs, in the circumferential direction of the annular yoke, the size of the air gap is greater than 0 mm and less than 3 mm.

[0026] In this design, the size of the air gap affects the operational reliability of the entire rotor assembly. Excessively large air gaps increase magnetic resistance, leading to increased excitation losses and reduced magnetization of the protrusions by the permanent magnets, making it impossible to produce an alternating-pole structure. However, too small an air gap increases the harmonic magnetic field in the air gap, making it more likely that the permanent magnets will collide with the inner walls of the housing during operation, reducing operational reliability and complicating assembly.

[0027] In this design, the air gap is set to be larger than 0 mm and smaller than 3 mm. This not only keeps the magnetic resistance within the appropriate range, ensuring the best magnetization effect of the permanent magnet on the protrusion, but also reduces assembly difficulty and improves operational reliability.

[0028] In some possible designs, an angle γ is formed between the center of the annular yoke and the lines connecting the two ends of the permanent magnet, and satisfies 0.9<γ / (π / (P_r))<1.7, where P_r is the number of permanent magnets.

[0029] In this design, an angle γ is formed between the line connecting the center of the annular yoke and the two ends of the permanent magnet. The existence of the angle can further change the air gap magnetic permeability process, enhance the magnetic field modulation effect, and increase the amplitude of the working sub-magnetic flux density harmonics, thereby further improving the torque of the motor using the sub-rotor assembly. This also avoids the problem of reduced number of magnetic poles and decreased amplitude of the fundamental wave of the magnetic field after the use of alternating poles in traditional permanent magnet motors, which leads to a decrease in torque.

[0030] Furthermore, 0.9<γ / (π / (P_r))<1.7 is satisfied, wherein P_r is the number of permanent magnets. When the angle γ satisfies the above condition, the working performance of the rotor assembly is good.

[0031] In some possible designs, the permanent magnet includes one of the following: a ferrite or rare earth permanent magnet;

[0032] In this design, the permanent magnet can be ferrite, and rare earth permanent magnets have good magnetic conductivity.

[0033] In this design, the permanent magnet may also be a rare earth permanent magnet, which has extremely high magnetic energy.

[0034] In some possible designs, the protrusion includes a spline surface, and the spline surface is arranged toward the middle of the annular yoke.

[0035] In this design, the protrusion includes a spline surface, which is arranged toward the middle of the annular yoke. The spline surface is formed in one piece, thereby reducing the difficulty of processing.

[0036] In some possible designs, in the circumferential direction of the annular yoke, the spline surface includes a plurality of connected sub-spline surfaces, and the sub-spline surfaces include planes and / or arc surfaces.

[0037] In this design, the spline surface along the circumference of the annular yoke comprises multiple connected sub-spline surfaces. Each segment smoothly connects to create a consistent curvature across the entire spline surface, thereby reducing energy loss during rotor assembly operation. The sub-spline surfaces include both flat and / or curved surfaces, ensuring that the curvatures of each segment are more similar.

[0038] According to a second aspect of the present invention, an electric motor is provided, comprising: a rotor assembly as in any possible design described above, and a stator assembly, wherein at least a portion of the stator assembly is located within the rotor assembly.

[0039] The motor provided by the second aspect of the present invention comprises: a rotor assembly as in any of the possible designs described above, and thus has all the beneficial effects of the rotor assembly in any of the possible designs described above.

[0040] Furthermore, the motor also includes a stator assembly, at least a portion of which is located within the rotor assembly. When the motor is in operation, power is supplied to the motor, generating a rotating magnetic field. The magnetic lines of force in the rotating magnetic field cut through the rotor assembly, generating current. This current is then transmitted within the motor to the terminal, enabling the motor to output current.

[0041] At the same time, after the rotor assembly adopts the alternating pole structure, the protruding structure of the protrusion on the rotor enhances the air gap magnetic permeability, enhances the modulation effect, increases the amplitude of the working sub-magnetic harmonic, and further improves the motor torque, thereby generating a greater driving torque and a stronger driving force.

[0042] In addition, the motor in the above possible design provided by the present invention may also have the following additional technical features:

[0043] In some possible designs, the stator assembly includes: a stator core, the stator core includes: a yoke; stator main teeth, arranged on the yoke, the stator main teeth include tooth shoes, there is a stator slot between two adjacent stator main teeth, there is a notch between two adjacent tooth shoes, the slot is connected to the stator slot; a stator winding, arranged on the stator main teeth and located in the stator slot.

[0044] In this design, the stator assembly includes: a stator core, stator main teeth and stator windings. The stator core includes a yoke, which serves as the main magnetic circuit of the stator and as a mounting and fixing component for the stator main teeth and stator windings.

[0045] Furthermore, the stator main teeth are mounted on the yoke and secured thereto. The stator main teeth include tooth shoes, with stator slots located between adjacent stator main teeth, creating a gap between them and accommodating the stator slots. A notch is located between adjacent tooth shoes, connecting to the stator slots. This arrangement of stator slots and notches reduces the motor's starting torque, improves the air gap magnetic field waveform, and reduces additional losses.

[0046] Furthermore, the stator winding in the stator assembly is arranged on the stator main teeth and located in the stator slots. The stator winding is the input circuit part of the motor, and generates an alternating magnetic field by passing an alternating current.

[0047] In some possible designs, the stator core also includes: at least two stator auxiliary teeth, arranged on the tooth shoe; wherein, the pole pair number of the stator winding Ps = │ax±Pr│, a represents the number of stator main teeth, x represents the number of stator auxiliary teeth on each stator main tooth, and Pr represents the number of multiple permanent magnets.

[0048] In this design, the stator core also includes at least two stator auxiliary teeth, which are arranged on the tooth shoes. On the one hand, the stator auxiliary teeth serve as magnetic conductive components to conduct magnetism. On the other hand, the stator auxiliary teeth can also serve as modulation components to realize the function of magnetic field modulation.

[0049] Furthermore, the number of pole pairs in the stator winding satisfies the relationship Ps = |ax ± Pr|, where a represents the number of stator main teeth, x represents the number of stator auxiliary teeth per stator main tooth, and Pr represents the number of permanent magnets. This allows the new harmonic components in the air gap flux density to function as operating harmonics, providing output torque for the motor, effectively improving its torque density.

[0050] In some possible designs, a groove is provided between two adjacent stator auxiliary teeth; and in the circumferential direction of the stator assembly, the size of the groove is different from the size of the slot.

[0051] In this design, a groove is placed between adjacent stator teeth, introducing a significant amount of harmonics into the air gap flux density. When the magnetomotive force of the permanent magnets in the rotor assembly interacts with the harmonic air gap flux density, new harmonic components appear in the air gap flux density. These harmonics act as the motor's operating harmonics, providing output torque and effectively improving the motor's torque density.

[0052] Furthermore, the dimensions of the grooves and slot openings in the circumferential direction of the stator assembly are different. That is, the width of the grooves between two adjacent stator auxiliary teeth is different from the width of the stator slot openings between two adjacent tooth shoes. This changes the uniformity of the distribution of the multiple stator auxiliary teeth in the circumferential direction of the stator assembly, thereby reducing the number of air gap permeance periods. When the number of air gap permeance periods decreases, the harmonic components of the magnetic flux density generated by modulation increase, generating more operating harmonics and further improving the motor's output torque. This, in turn, improves the motor's operating performance.

[0053] In some possible designs, in two adjacent stator auxiliary teeth, an angle β is formed between the tooth body bisector of one stator auxiliary tooth and the tooth body bisector of the other stator auxiliary tooth, and satisfies 1≤β / (2π / (ax))<1.4, where a represents the number of stator main teeth, and x represents the number of stator auxiliary teeth on each stator main tooth.

[0054] In this design, in two adjacent stator auxiliary teeth, an angle β is formed between the tooth body bisector of one stator auxiliary tooth and the tooth body bisector of the other stator auxiliary tooth. The existence of the angle β enables the motor modulation to generate harmonic amplitude and have a certain torque.

[0055] Furthermore, the angle β satisfies the formula 1≤β / (2π / (ax))<1.4, where a represents the number of stator main teeth and x represents the number of stator auxiliary teeth on each stator main tooth. In this case, the harmonic amplitude generated by the motor adjustment is large, and the motor torque is also large.

[0056] Specifically, the tooth body bisector of the stator auxiliary tooth is: a line connecting the middle of the stator auxiliary tooth and the center of the stator core on the outer circumference of the stator core.

[0057] According to yet another aspect of the present invention, an electrical device is provided, comprising: a motor as in any of the possible designs described above.

[0058] Another aspect of the present invention provides an electrical device, which includes a motor in any of the above possible designs, and thus has all the beneficial effects of the motor in any of the above possible designs, which will not be described in detail here.

[0059] Additional aspects and advantages of the invention will become apparent from the description which follows, or may be learned by practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0061] Figure 1 A schematic structural diagram of a magnetically conductive hub frame in a rotor assembly according to an embodiment of the present invention is shown.

[0062] Figure 2 A schematic structural diagram of a rotor assembly according to an embodiment of the present invention is shown.

[0063] Figure 3 A structural schematic diagram of a motor according to an embodiment of the present invention is shown.

[0064] in, Figures 1 to 3 The corresponding relationship between the reference numerals and component names is as follows:

[0065] 100 rotor assembly, 102 magnetic hub frame, 104 end cover, 106 annular yoke, 108 receiving portion, 110 permanent magnet, 112 protrusion, 114 air gap, 116 motor, 118 yoke, 120 stator main teeth, 122 tooth shoes, 124 stator slots, 126 notches, 128 stator auxiliary teeth, 130 grooves, 132 spline surface. DETAILED DESCRIPTION

[0066] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0067] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0068] Refer to the following Figures 1 to 3 The rotor assembly 100, the motor 116 and the electrical equipment provided in some embodiments of the present invention are described below. Figure 3 The middle dashed line represents the tooth body bisector of the stator auxiliary tooth 128 .

[0069] like Figure 1 、 Figure 2 and Figure 3 As shown, the present invention proposes a rotor assembly 100 in a first aspect. The rotor assembly 100 comprises a magnetic hub frame 102, which includes an end cover 104 and an annular yoke 106. The end cover 104 is connected to one axial end of the annular yoke 106. The inner circumferential wall of the annular yoke 106 is provided with a plurality of accommodating portions 108, which are distributed along the circumference of the annular yoke 106. A plurality of permanent magnets 110 are respectively disposed in the plurality of accommodating portions 108, and the plurality of permanent magnets 110 have the same polarity.

[0070] The rotor assembly 100 provided by the present invention includes a magnetic hub frame 102 and a plurality of permanent magnets 110. The magnetic hub frame 102 includes an end cover portion 104 and an annular yoke portion 106 that are connected to each other; the end cover portion 104 is connected to one axial end of the annular yoke portion 106, and the inner circumferential wall of the annular yoke portion 106 is provided with a plurality of accommodating portions 108, and the plurality of accommodating portions 108 are distributed along the circumferential direction of the annular yoke portion 106; the plurality of permanent magnets 110 are respectively arranged in the plurality of accommodating portions 108. Moreover, the polarities of the plurality of permanent magnets 110 in the rotor assembly 100 proposed by the present invention are the same. Specifically, in the rotor assembly 100 proposed by the present invention, the magnetic hub frame 102 is made of magnetic material.

[0071] Specifically, the sizes of the plurality of receiving portions 108 are equal, so that they can all be suitable for permanent magnets 110 of the same specifications. Furthermore, the permanent magnet 110 can be a bar-shaped permanent magnet, a fan-shaped permanent magnet, a horseshoe-shaped permanent magnet, or a circular permanent magnet.

[0072] In particular, the magnetically conductive hub frame 102 of the rotor assembly 100 proposed in the present invention comprises a connected end cap portion 104 and an annular yoke portion 106, resulting in a simple overall structure. Furthermore, the present invention provides multiple accommodating portions 108 directly on the inner circumferential wall of the annular yoke portion 106, ensuring that the multiple accommodating portions 108 are distributed along the circumference of the annular yoke portion 106.

[0073] In this way, after multiple permanent magnets 110 with the same polarity are respectively assembled into multiple accommodating portions 108, firstly, effective installation and positioning of the multiple permanent magnets 110 can be guaranteed, and secondly, the multiple permanent magnets 110 with the same polarity can be guaranteed to be spaced apart and distributed in the circumferential direction of the annular yoke 106.

[0074] Specifically, the permanent magnet 110 includes a bar-shaped permanent magnet, a polygonal permanent magnet, etc. Because the permanent magnet 110 is placed in the accommodating portion 108 in this embodiment, permanent magnets 110 of various shapes can be used as long as their sizes are within the size limit of the accommodating portion 108, making the processing and manufacturing of the permanent magnet 110 more convenient and quick, and the various types of permanent magnets 110 have greater versatility.

[0075] Therefore, the magnetic hub frame 102 in the rotor assembly 100 proposed in the present invention includes an annular yoke 106 and an end cover 104 connected to one axial end of the annular yoke 106, thereby improving the overall structural strength of the magnetic hub frame 102; the inner circumferential wall of the annular yoke 106 is provided with a plurality of accommodating portions 108, and the plurality of accommodating portions 108 are distributed along the circumferential direction of the annular yoke 106, and a plurality of permanent magnets 110 with the same polarity are arranged in the plurality of accommodating portions 108, thereby generating a magnetic structure with alternating poles on the annular yoke 106, thereby reducing the number of permanent magnets 110 used, enhancing the magnetic field modulation effect, increasing the amplitude of the working sub-magnetic harmonic, and generating better output performance.

[0076] In one embodiment of the present invention, Figure 1 、 Figure 2 and Figure 3 As shown, the magnetic hub frame 102 further includes a protrusion 112 disposed on the inner peripheral wall of the annular yoke 106 and protruding toward the middle of the annular yoke 106 , and the accommodating portion 108 is located between two adjacent protrusions 112 .

[0077] In this embodiment, the magnetic hub frame 102 further includes a protrusion 112. The protrusion 112 is disposed on the inner circumferential wall of the annular yoke 106 and protrudes toward the center of the annular yoke 106. Accommodation portions 108 are formed between adjacent protrusions 112. Based on this, the present invention disposes multiple permanent magnets 110 of the same polarity within the multiple accommodation portions 108. Thus, the protrusions 112 and the permanent magnets 110 are alternately distributed along the circumference of the annular yoke 106, thereby forming an alternating pole structure.

[0078] Specifically, the protrusions 112 made of magnetic conductive material will be magnetized by the adjacent permanent magnets 110 into magnets with opposite magnetic poles. Thus, the permanent magnets 110 have the same polarity, while the adjacent protrusions 112 have opposite polarities, thereby forming an alternating pole structure.

[0079] Specifically, the protrusion 112 includes a square protrusion or a polygonal protrusion. Any shape of the protrusion 112 that can achieve a partitioning effect and is easy to process is within the protection scope of the present invention.

[0080] This design effectively reduces the manufacturing difficulty of the alternating-pole rotor in the related art. In addition, the rotor assembly 100 is designed with the number of stator and rotor magnetic field poles and utilizes magnetic field harmonics to operate, avoiding the problem of output performance degradation caused by the decrease in the fundamental amplitude of magnetic field after the use of alternating poles.

[0081] Specifically, in related art, the use of an alternating-pole structure reduces the number of magnetic poles, resulting in a decrease in the fundamental amplitude of the air gap magnetic field, and consequently, reduced motor output performance. The present invention utilizes a magnetic field modulation motor structure, specifically applying the rotor assembly 100 proposed in the present invention to a magnetic field modulation motor. This utilizes harmonics to operate, enhancing the modulation effect through a salient-pole rotor, and increasing the operating harmonic content, thereby improving the output performance of motor 116. This avoids the performance degradation of motor 116 caused by the decrease in fundamental amplitude associated with the alternating-pole structure.

[0082] Specifically, the number of permanent magnets 110 and the number of protrusions 112 are equal.

[0083] In one embodiment of the present invention, Figure 1 、 Figure 2 and Figure 3 As shown, the thickness of the protrusion 112 is equal to the thickness of the annular yoke 106 .

[0084] In this embodiment, the thickness of the protrusion 112 is equal to that of the annular yoke 106, allowing the protrusion 112 and the annular yoke 106 to be drawn from the same sheet material, resulting in a simpler structure and reduced manufacturing difficulty. Furthermore, this arrangement enhances the overall structural strength of the magnetic hub frame 102, extending its service life.

[0085] In one embodiment of the present invention, an air gap 114 exists between the permanent magnet 110 and the inner wall of the receiving portion 108 in the circumferential direction of the annular yoke 106 .

[0086] In this embodiment, an air gap 114 exists between the permanent magnet 110 and the inner wall of the housing 108 in the circumferential direction of the annular yoke 106. The presence of the air gap 114 effectively reduces magnetic flux leakage between the permanent magnet 110 and the inner wall of the housing cavity, optimizing the magnetization effect of the permanent magnet 110 on the protrusion 112. Furthermore, the presence of the air gap 114 reduces assembly difficulty, thereby improving the operational reliability of the rotor assembly 100.

[0087] In one embodiment of the present invention, Figure 2 As shown, in the circumferential direction of the annular yoke 106 , the size of the air gap 114 is greater than 0 mm and less than 3 mm.

[0088] In this embodiment, the size of the air gap 114 affects the operational reliability of the entire rotor assembly 100. If the air gap 114 is too large, the magnetic resistance will increase, thereby increasing the excitation loss, reducing the magnetizing effect of the permanent magnet 110 on the protrusion 112, and thus failing to produce an alternating pole structure. If the air gap 114 is too small, the harmonic magnetic field of the air gap 114 will increase, and the permanent magnet 110 will easily collide with the inner wall of the accommodating cavity during operation, thereby reducing operational reliability and causing assembly difficulties.

[0089] Furthermore, the size d of the air gap 114 is set to be greater than 0 mm and less than 3 mm. This can keep the magnetic resistance within a suitable range, optimize the magnetization effect of the permanent magnet 110 on the protrusion 112, reduce assembly difficulty, and thus improve operational reliability.

[0090] Therefore, after the present invention generates an alternating pole magnetic structure on the annular yoke 106 , the size d of the air gap 114 is further optimized, thereby further enhancing the magnetic field modulation effect and increasing the amplitude of the working subharmonic magnetic flux density, thereby producing better output performance.

[0091] Specifically, the size of the air gap 114 can be set to 1 mm, 1.5 mm, 2 mm, 2.5 mm, etc.

[0092] In one embodiment of the present invention, Figure 2 As shown, an angle γ is formed between the center of the annular yoke 106 and the connecting line of the two ends of the permanent magnet 110 , and satisfies 0.9<γ / (π / (Pr))<1.7, where Pr is the number of the permanent magnets 110 .

[0093] In this embodiment, an angle γ is formed between the center of the annular yoke 106 and the connecting line at both ends of the permanent magnet 110. The existence of the angle γ can further change the air gap magnetic permeability process, enhance the magnetic field modulation effect, and increase the amplitude of the working sub-magnetic harmonic, thereby further improving the torque of the motor 116 using this rotor assembly 100. This also avoids the problem of a decrease in the number of magnetic poles and a decrease in the amplitude of the fundamental wave of the magnetic field after the alternating poles are used in traditional permanent magnet motors, resulting in a decrease in torque.

[0094] Furthermore, the angle γ satisfies: 0.9<γ / (π / (Pr))<1.7, where Pr is the number of permanent magnets 110. When the angle γ satisfies the above conditions, the magnetic field modulation effect is further enhanced, and the working performance of the rotor assembly 100 is good.

[0095] Therefore, after the present invention generates a magnetic structure with alternating poles on the annular yoke 106, the angle γ formed between the center of the annular yoke 106 and the connecting lines at both ends of the permanent magnet 110 is further optimized, thereby further enhancing the magnetic field modulation effect, increasing the amplitude of the working sub-magnetic harmonic, and producing better output performance.

[0096] In one embodiment of the present invention, Figure 1 、 Figure 2 and Figure 3 As shown, the permanent magnet 110 comprises one of: a ferrite or a rare earth permanent magnet.

[0097] In this embodiment, the permanent magnet 110 may be made of ferrite, which has good magnetic conductivity.

[0098] Specifically, the permanent magnet 110 is an object that generates a magnetic field. Ferrite is made from various mixed materials and can generate a stronger magnetic field than natural magnets in nature. It is inexpensive and highly corrosion-resistant, does not require additional coating for protection, and can resist demagnetization by external magnetic fields, thereby ensuring performance and reducing manufacturing costs.

[0099] In this embodiment, the permanent magnet 110 may also be a rare earth permanent magnet, which has extremely high magnetic energy and can resist demagnetization by an external magnetic field.

[0100] In one embodiment of the present invention, Figure 1 、 Figure 2 and Figure 3 As shown, the protrusion 112 includes a spline surface 132 disposed toward the middle of the annular yoke 106 .

[0101] In this embodiment, the protrusion 112 includes a spline surface 132 . The spline surface 132 is arranged toward the middle of the annular yoke 106 . The spline surface 132 is integrally formed, thereby reducing the difficulty of processing.

[0102] In one embodiment of the present invention, Figure 1 、 Figure 2 and Figure 3 As shown, in the circumferential direction of the annular yoke 106 , the spline surface 132 includes a plurality of connected sub-spline surfaces, each of which includes a plane and / or an arc surface.

[0103] In this embodiment, the spline surface 132 comprises multiple connected sub-spline surfaces along the circumference of the annular yoke 106. Each segment is smoothly connected, resulting in a consistent curvature of the overall spline surface 132, thereby reducing energy loss during operation of the rotor assembly 100. The sub-spline surfaces include flat surfaces and / or curved surfaces, ensuring that the curvatures of the surfaces of each segment are closer.

[0104] like Figure 3 As shown, according to a second aspect of the present invention, an electric machine 116 is proposed, comprising: a rotor assembly 100 as in any possible design described above, and a stator assembly, at least a portion of the stator assembly being located within the rotor assembly 100 .

[0105] In one embodiment of the present invention, a motor 116 is provided, which includes a rotor assembly 100 as in any of the above embodiments, and thus has all the beneficial effects of the rotor assembly 100 in any of the above embodiments, which will not be described in detail here.

[0106] The motor 116 converts or transmits electrical energy according to the law of electromagnetic induction, and can generate driving torque as a power source for various devices or machines. Specifically, the motor of the present invention can have an inner rotor or outer rotor structure.

[0107] Furthermore, the motor 116 also includes a stator assembly, at least a portion of which is located within the rotor assembly 100. When the motor 116 is in operation, the motor 116 is energized, the stator assembly generates a rotating magnetic field, and the rotor assembly 100 is cut by the magnetic lines of force in the rotating magnetic field, generating current. The current is transmitted within the motor 116 to the output terminal, thereby enabling the motor 116 to output current.

[0108] At the same time, after the rotor assembly 100 adopts the alternating pole structure, the protruding structure of the protrusion 112 on the rotor enhances the air gap magnetic permeability, enhances the modulation effect, increases the amplitude of the working sub-magnetic harmonic, and further improves the torque of the motor 116, thereby generating a greater driving torque and being able to produce a stronger driving effect.

[0109] In one embodiment of the present invention, Figure 3As shown, the stator assembly includes: a stator core, which includes: a yoke 118; stator main teeth 120, which are arranged on the yoke 118, and the stator main teeth 120 include tooth shoes 122, with stator slots 124 being provided between two adjacent stator main teeth 120, and slots 126 being provided between two adjacent tooth shoes 122, and the slots 126 being connected to the stator slots 124; and stator windings, which are provided on the stator main teeth 120 and located in the stator slots 124.

[0110] In this embodiment, the stator assembly includes a stator core, stator main teeth 120 and stator windings. The stator core includes a yoke 118, which serves as the main magnetic circuit of the stator and as a mounting and fixing component for the stator main teeth 120 and the stator windings.

[0111] Furthermore, the stator main teeth 120 are mounted on and secured by the yoke 118. Each stator main tooth 120 includes a tooth shoe 122. Stator slots 124 are located between adjacent stator main teeth 120, creating a gap between them. The stator slots 124 also serve to accommodate the gaps. A notch 126 is located between adjacent tooth shoes 122, communicating with the stator slots 124. The arrangement of the stator slots 124 and notch 126 reduces the starting torque of the motor 116, improves the air gap magnetic field waveform, and reduces additional losses.

[0112] Furthermore, the stator winding in the stator assembly is provided on the stator main teeth 120 and is located in the stator slots 124 . The stator winding is the input circuit portion of the motor 116 , and generates an alternating magnetic field by passing an alternating current.

[0113] Specifically, the roots of the stator main teeth 120 are connected to the yoke 118 to achieve a stable connection between the stator main teeth 120 and the yoke 118. Tooth boots 122 are provided at the tooth tips of the stator main teeth 120. The provision of tooth boots 122 effectively limits the stator windings located within the stator slots 124, thereby ensuring that these portions of the stator windings are stably located within the stator slots 124 and preventing these portions of the winding assembly from falling out of the stator slots 124, thereby improving the reliability of the stator assembly.

[0114] Furthermore, the tooth shoe 122 is detachably connected to the stator main tooth 120. That is, the tooth shoe 122 and the stator main tooth 120 are arranged in a detachable sleeve assembly structure. This allows the coil to be wound on the stator main tooth 120 first, and then assembled with the tooth shoe 122 after winding is completed. This simplifies the winding process and reduces the difficulty of winding.

[0115] In one embodiment of the present invention, Figure 3As shown, the stator core also includes: at least two stator auxiliary teeth 128, which are arranged on the tooth shoe 122; wherein, the pole pair number Ps of the stator winding is Ps = │ax±Pr│, a represents the number of stator main teeth 120, x represents the number of stator auxiliary teeth 128 on each stator main tooth 120, and Pr represents the number of multiple permanent magnets 110.

[0116] In this embodiment, the stator core further includes at least two stator auxiliary teeth 128, which are arranged on the tooth shoe 122. On the one hand, the stator auxiliary teeth 128 serve as magnetic conductive components to conduct magnetism, and on the other hand, the stator auxiliary teeth 128 can also serve as modulation components to achieve the function of magnetic field modulation.

[0117] Furthermore, the number of pole pairs of the stator winding satisfies the relationship Ps = |ax ± Pr|, where a represents the number of stator main teeth 120, x represents the number of stator auxiliary teeth 128 on each stator main tooth 120, and Pr represents the number of the plurality of permanent magnets 110. In this way, the new harmonic components appearing in the air gap flux density can be used as operating harmonics of the motor 116, thereby providing output torque for the motor 116, thereby effectively improving the torque density of the motor 116.

[0118] Therefore, after the present invention generates an alternating pole magnetic structure on the annular yoke 106, the pole pair number Ps of the stator winding is further optimized, thereby further enhancing the magnetic field modulation effect, increasing the amplitude of the working sub-magnetic harmonic, and producing better output performance.

[0119] In one embodiment of the present invention, Figure 3 As shown, there is a groove 130 between two adjacent stator auxiliary teeth 128 ; in the circumferential direction of the stator assembly, the size of the groove 130 is different from the size of the notch 126 .

[0120] In this embodiment, a groove 130 is provided between two adjacent stator auxiliary teeth 128, introducing a relatively large number of harmonic components into the air gap magnetic flux density. When the magnetomotive force of the permanent magnets 110 in the rotor assembly 100 interacts with the harmonic air gap magnetic flux density, new harmonic components appear in the air gap magnetic flux density. These harmonic components serve as operating harmonics for the motor 116, providing output torque for the motor 116 and effectively improving the torque density of the motor 116.

[0121] Furthermore, in the circumferential direction of the stator assembly, the size of the grooves 130 is not equal to the size of the slots 126. That is, the width of the grooves 130 between two adjacent stator auxiliary teeth 128 is not equal to the width of the slots 126 of the stator slots 124 between two adjacent tooth shoes 122. This changes the uniformity of the distribution of the multiple stator auxiliary teeth 128 in the circumferential direction of the stator assembly, thereby reducing 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 flux density generated by modulation will increase, that is, more operating harmonics will be generated, and the output torque of the motor 116 will be further improved. This will further improve the operating performance of the motor 116.

[0122] Therefore, after the present invention generates an alternating pole magnetic structure on the annular yoke 106 , the size of the groove 130 and the size of the notch 126 are further optimized, thereby further enhancing the magnetic field modulation effect and increasing the amplitude of the working subharmonic magnetic flux density, thereby producing better output performance.

[0123] In one embodiment of the present invention, Figure 3 As shown, in two adjacent stator auxiliary teeth 128, an angle β is formed between the tooth body bisector of one stator auxiliary tooth 128 and the tooth body bisector of the other stator auxiliary tooth 128, and satisfies 1≤β / (2π / (ax))<1.4, where a represents the number of stator main teeth 120, and x represents the number of stator auxiliary teeth 128 on each stator main tooth 120.

[0124] In this embodiment, in two adjacent stator auxiliary teeth 128 , an angle β is formed between the tooth body bisector of one stator auxiliary tooth 128 and the tooth body bisector of the other stator auxiliary tooth 128 . The existence of the angle β enables the motor 116 to modulate and generate harmonic amplitude and a certain torque.

[0125] Furthermore, the angle β satisfies the formula 1≤β / (2π / (ax))<1.4, where a represents the number of stator main teeth 120, and x represents the number of stator auxiliary teeth 128 on each stator main tooth 120. In this case, the harmonic amplitude generated by the adjustment of the motor 116 is large, and the torque of the motor 116 is also large.

[0126] Therefore, after the present invention generates an alternating pole magnetic structure on the annular yoke 106, the angle β between the tooth body bisector of one stator auxiliary tooth 128 and the tooth body bisector of another stator auxiliary tooth 128 is further optimized, thereby further enhancing the magnetic field modulation effect, increasing the amplitude of the working sub-harmonic magnetic flux density, and producing better output performance.

[0127] In a specific embodiment, β / (2π / (ax)) can be 1, 1.1, 1.2, 1.3, 1.4, etc., and those skilled in the art can design it according to the actual product.

[0128] According to an embodiment of the present invention, an electrical device is further provided, including: a motor 116 as in any of the possible designs described above.

[0129] The electrical device proposed in this embodiment includes the motor 116 in any of the above embodiments, and therefore has all the beneficial effects of the motor 116 in any of the above embodiments. Multiple permanent magnets 110 with the same polarity are arranged in multiple accommodating portions 108, and an alternating pole magnetic structure is generated on the annular yoke 106, thereby reducing the number of permanent magnets 110 used and enhancing the magnetic field modulation effect. The amplitude of the working sub-magnetic harmonic is increased, resulting in better output performance, which will not be discussed in detail here.

[0130] In one embodiment of the present invention, Figure 1 、 Figure 2 and Figure 3 As shown, the motor 116 includes a rotor assembly 100 and a stator assembly disposed concentrically with the rotor assembly 100 and disposed inside the rotor assembly 100 .

[0131] The stator assembly includes a stator core and stator windings wound around the stator core. The stator core comprises a yoke 118 and a plurality of stator main teeth 120 extending radially from the yoke 118. Stator slots 124 are defined between adjacent stator main teeth 120. Each stator main tooth 120 includes a tooth shoe 122, and a notch 126 is defined between adjacent tooth shoes 122. The notch 126 connects to the stator slots 124. The stator slots 124 accommodate the stator windings.

[0132] Specifically, the stator winding includes multiple coils, each wound around only one stator main tooth 120. This employs a concentrated winding structure wound around a single stator main tooth 120. This reduces the winding ends of the motor 116, reducing copper consumption and facilitating modularization, thereby improving manufacturing efficiency.

[0133] Furthermore, a plurality of stator auxiliary teeth 128 are distributed on each tooth shoe 122. In addition to being a magnetic conductive component, the stator auxiliary teeth 128 can also be used as a modulation component to achieve magnetic field modulation. Grooves 130 are formed between adjacent stator auxiliary teeth 128. The width of the grooves 130 is relatively large, so that more harmonic components are introduced into the air gap magnetic conductivity. When the magnetomotive force of the permanent magnet 110 in the rotor assembly 100 and the air gap magnetic conductivity containing harmonics interact, new harmonic components will appear in the air hole magnetic flux density, thereby improving the torque density of the motor 116.

[0134] Furthermore, in the stator assembly of this embodiment, the width of the stator slot 124 is not equal to the width of the groove 130 between adjacent stator auxiliary teeth 128. At this time, the uniformity of the distribution of the multiple stator auxiliary teeth 128 on the circumference is changed, and the number of periods of the air gap magnetic permeance is reduced, so that the harmonic component of the magnetic density generated by the adjustment is increased, thereby generating more working harmonics, so that the output torque of the motor 116 will be further improved.

[0135] Furthermore, between two adjacent stator auxiliary teeth 128, an angle β is formed between the tooth body bisector of one stator auxiliary tooth 128 and the tooth body bisector of the other stator auxiliary tooth 128, and the relationship 1≤β / (2π / (ax))<1.4 is satisfied. In the above relationship, a represents the number of stator main teeth 120, and x represents the number of stator auxiliary teeth 128 on each stator main tooth 120. In this case, the harmonic amplitude generated by the modulation of the motor 116 is large, and the torque is high.

[0136] Rotor assembly 100 includes a magnetic hub frame 102, which includes an annular yoke 106 extending circumferentially along end cap 104 and a plurality of protrusions 112 evenly distributed circumferentially. Annular yoke 106 and protrusions 112 have equal thickness. With this design, the magnetic hub frame can be integrally formed by stretching from a magnetically conductive material, resulting in a simple structure and minimal manufacturing complexity. Furthermore, the integral structure of the magnetic hub frame provides high strength.

[0137] An accommodating portion 108 is provided between two adjacent protrusions 112. The permanent magnet 110 is provided on the inner circumferential surface of the annular yoke 106 and placed in the accommodating portion 108. In addition, the number of permanent magnets 110 is equal to the number of protrusions 112, and the polarities of the multiple permanent magnets 110 are the same, which can be all S poles or all N poles. In this way, the magnetization generated by the permanent magnet 110 can magnetize the adjacent protrusions 112. The polarity of the magnetized protrusions 112 is different from that of the permanent magnet 110, thereby creating a structure of alternating magnetic poles.

[0138] Furthermore, an air gap 114 exists between the permanent magnet 110 and the protrusion 112, thereby effectively reducing magnetic flux leakage between the two ends of the permanent magnet 110 and the protrusion 112. The width of the air gap 114 is set within 0 mm to 3 mm, at which time the motor 116 has better output performance.

[0139] Furthermore, the protrusion 112 includes a square surface, a polygonal surface or a spline surface 132. When it is a spline surface 132, the sub-spline surface can be a plurality of straight lines or a combination of straight lines and arcs, thereby ensuring that the curvature of each part of the surface is consistent.

[0140] Furthermore, permanent magnets 110 include square permanent magnets, tile-shaped permanent magnets, or bread-shaped permanent magnets. When the number of permanent magnets 110 is Pr, the angle between the side surfaces of permanent magnets 110 and the centerline of the rotor is γ. When the relationship 0.9 < γ / (π / (Pr)) < 1.7, motor 116 has better output performance. Permanent magnets 110 include ferrite or rare earth permanent magnets.

[0141] In the present invention, a certain relationship is satisfied between the number of pole pairs of the stator assembly and the rotor assembly 100. Specifically, the number of stator main teeth 120 is a, the number of stator auxiliary teeth 128 distributed on the tooth shoe 122 of each stator main tooth 120 is x, the number of pole pairs of the stator winding is Ps, and the number of permanent magnets 110 in the rotor assembly 100 is Pr. When the relationship Ps=│ax±Pr│ is satisfied, the new harmonic components appearing in the air gap magnetic flux can be used as the working harmonics of the motor 116, providing output torque for the motor 116, thereby effectively improving the torque density of the motor 116.

[0142] Furthermore, the electronic rotor assembly 100 is provided with a protrusion 112. The presence of the protrusion enhances the modulation effect and increases the amplitude of the operating subharmonics of the magnetic flux density, thereby improving the output torque of the motor 116. This avoids the problem in the conventional alternating-pole structure where the number of magnetic poles is reduced, resulting in a decrease in the fundamental wave amplitude and a reduction in the output performance of the motor 116.

[0143] In this embodiment, the present invention employs a magnetic field modulation motor structure, namely, the rotor assembly 100 is applied to a magnetic field modulation motor, which utilizes harmonics for operation. The protruding structure of the rotor assembly 100 has polarity to enhance the modulation effect, increase the operating harmonic content, and thus improve the output performance of the motor 116. This avoids the problem of decreased fundamental wave amplitude in the alternating pole structure that degrades the performance of the motor 116.

[0144] In the description of the present invention, the term "plurality" refers to two or more than two. Unless otherwise expressly defined, the orientations or positional relationships indicated by the terms "upper" and "lower" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. The terms "connect," "install," and "fix" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0145] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0146] The above are merely preferred embodiments of the present invention and are 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 shall be included within the scope of protection of the present invention.

Claims

1. A rotor assembly, characterized in that: include: A magnetically conductive hub frame, the magnetically conductive hub frame comprising an end cover portion and an annular yoke portion, the end cover portion being connected to one axial end of the annular yoke portion, the inner circumferential wall of the annular yoke portion being provided with a plurality of accommodating portions, the plurality of accommodating portions being distributed along the circumferential direction of the annular yoke portion; A plurality of permanent magnets are respectively disposed in the plurality of accommodation portions, the plurality of permanent magnets having the same polarity, and the plurality of permanent magnets having the same polarity are spaced apart and distributed in the circumferential direction of the annular yoke; In the circumferential direction of the annular yoke, an air gap exists between the permanent magnet and the inner wall of the accommodation portion; The magnetic hub frame further comprises: a protrusion, provided on the inner peripheral wall of the annular yoke and protruding toward the middle of the annular yoke, wherein the accommodating portion is located between two adjacent protrusions; The thickness of the protrusion is equal to the thickness of the annular yoke; The number of the permanent magnets is equal to the number of the protrusions; The protrusion and the annular yoke are formed by stretching from the same plate; The magnetic hub frame is made of magnetic conductive material. The protrusions and the permanent magnets are alternately distributed in the circumferential direction of the annular yoke to form an alternating pole structure.

2. The rotor assembly according to claim 1, wherein: The end cover portion and the annular yoke portion are an integrated structure.

3. The rotor assembly according to claim 1 or 2, characterized in that: In the circumferential direction of the annular yoke, a size of the air gap is greater than 0 mm and less than 3 mm.

4. The rotor assembly according to claim 1 or 2, characterized in that: An angle γ is formed between the center of the annular yoke and the connecting line of the two ends of the permanent magnet, and satisfies 0.9<γ / (π / (Pr))<1.7, wherein Pr is the number of the permanent magnets.

5. The rotor assembly according to claim 1 or 2, characterized in that: The permanent magnet includes one of the following: ferrite or rare earth permanent magnet.

6. The rotor assembly according to claim 1, wherein: The protrusion includes a spline surface, and the spline surface is arranged toward a middle portion of the annular yoke.

7. The rotor assembly according to claim 6, wherein: In the circumferential direction of the annular yoke, the spline surface includes a plurality of connected sub-spline surfaces, and the sub-spline surfaces include planes and / or arc surfaces.

8. A motor, characterized in that: include: The rotor assembly according to any one of claims 1 to 7; A stator assembly is provided, at least a portion of which is positioned within the rotor assembly.

9. The motor according to claim 8, characterized in that The stator assembly comprises: A stator core, comprising: yoke; stator main teeth, disposed on the yoke, the stator main teeth comprising tooth shoes, a stator slot being provided between two adjacent stator main teeth, a notch being provided between two adjacent tooth shoes, the notch being communicated with the stator slot; The stator winding is arranged on the stator main teeth and located in the stator slots.

10. The motor according to claim 9, characterized in that The stator core further comprises: at least two stator auxiliary teeth, disposed on the tooth shoe; The number of pole pairs of the stator winding Ps=│ax±Pr│, a represents the number of the stator main teeth, x represents the number of the stator auxiliary teeth on each of the stator main teeth, and Pr represents the number of the multiple permanent magnets.

11. The motor according to claim 10, characterized in that There is a groove between two adjacent stator auxiliary teeth; In the circumferential direction of the stator assembly, the size of the groove is different from the size of the notch.

12. The motor according to claim 10 or 11, characterized in that In two adjacent stator auxiliary teeth, an angle β is formed between a tooth body bisector of one stator auxiliary tooth and a tooth body bisector of the other stator auxiliary tooth, and satisfies 1≤β / (2π / (ax))<1.4, where a represents the number of the stator main teeth, and x represents the number of the stator auxiliary teeth on each stator main tooth.

13. An electrical device, characterized in that: include: A motor as claimed in any one of claims 8 to 12.

Images