Stator assemblies, motors and electrical equipment

Abstract

The present invention provides a stator assembly, motor, and electrical equipment. The stator assembly includes: stator main teeth, each comprising a tooth body and a tooth shoe, the tooth shoe being connected to one end of the tooth body; at least two auxiliary teeth disposed at the end of the tooth shoe distal from the tooth body, with a groove between adjacent auxiliary teeth; and permanent magnets disposed within the grooves. The stator assembly provided by the present invention, by disposing permanent magnets within the grooves between adjacent auxiliary teeth, further increases the harmonic components of the magnetic flux density modulated between the stator assembly and the rotor assembly, thereby generating more operating harmonics and further improving the motor's output torque.

Description

Technical Field

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

[0002] In related technologies, how to enable the motor to generate more working harmonics during operation, thereby improving the output torque of the motor, has become an urgent problem to be solved. 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 stator assembly.

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

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

[0007] A first aspect of the present invention provides a stator assembly, comprising: a stator main tooth, the stator main tooth comprising a tooth body and a tooth shoe, the tooth shoe being connected to one end of the tooth body; at least two auxiliary teeth being provided at the end of the tooth shoe away from the tooth body, and a groove being provided between two adjacent auxiliary teeth; and a permanent magnet being provided in the groove.

[0008] The stator assembly proposed in the present invention includes a stator main tooth, which includes a tooth body and a tooth shoe. The tooth shoe is connected to one end of the tooth body. Furthermore, the other end of the tooth body can be connected to the stator yoke, thereby realizing the connection between the stator main tooth and the stator yoke. Windings can be set on the stator main teeth to achieve cooperation with the magnetic field of the rotor permanent magnet in the rotor assembly of the motor when power is turned on, thereby realizing the rotation of the rotor assembly.

[0009] Furthermore, at least two auxiliary teeth are provided at the end of the tooth boot away from the tooth body. Through the setting of the auxiliary teeth, on the one hand, the auxiliary teeth can be used as magnetic conductive components to conduct magnetism, and on the other hand, the auxiliary teeth can also be used as modulation components to realize the function of magnetic field modulation, so that more harmonic components are introduced into the air gap magnetic permeability, thereby significantly improving the performance of the motor.

[0010] Furthermore, the stator assembly also includes a permanent magnet, which is arranged in the groove. Through the arrangement of the permanent magnet, during the operation of the motor, the permanent magnet can generate working harmonics through the rotor teeth on the rotor assembly. At the same time, the rotor permanent magnet on the rotor assembly can also modulate the working harmonics through the stator main teeth, thereby further increasing the magnetic density harmonic component modulated between the stator assembly and the rotor assembly, thereby generating more working harmonics and further improving the output torque of the motor.

[0011] Specifically, the pole pair number of the working harmonics generated between the permanent magnets in the stator assembly and the rotor teeth is: |Par±i×Pr|, and the pole pair number of the working harmonics modulated by the magnetic components on the rotor assembly through the stator main teeth is: |Pr±i×Zf|, where Zf is the number of stator side air gap magnetic permeability periods, Par is the pole pair number of the permanent magnets in the stator, Pr is the pole pair number of the rotor assembly, and i is an integer greater than or equal to 0.

[0012] The stator assembly provided by the present invention utilizes auxiliary teeth, which, in addition to serving as magnetic conductors, also function as modulators, achieving magnetic field modulation. This introduces a greater number of harmonic components into the air gap permeance, significantly improving motor performance. Furthermore, by placing permanent magnets in the grooves between adjacent auxiliary teeth, the harmonic components of the magnetic flux density modulated between the stator and rotor assemblies are further increased, thereby generating more operating harmonics and further improving the motor's output torque.

[0013] The stator assembly provided by the present invention may also have the following additional technical features:

[0014] In the above technical solution, further, the permanent magnet includes: a first permanent magnet, arranged in the groove; a second permanent magnet, arranged in the groove, and the second permanent magnet is located on the side of the first permanent magnet; the magnetization direction of the first permanent magnet is opposite to the magnetization direction of the second permanent magnet.

[0015] In this technical solution, in the axial direction of the stator assembly, the permanent magnet can be divided into two parts, that is, the permanent magnet includes a first permanent magnet and a second permanent magnet, the second permanent magnet is located on the side of the first permanent magnet, and the magnetization direction of the first permanent magnet is set to be opposite to the magnetization direction of the second permanent magnet. Specifically, the magnetization direction of the first permanent magnet can be N / S pole, and correspondingly, the magnetization direction of the second permanent magnet is S / N pole.

[0016] The axial segmentation setting of the permanent magnets of the stator assembly can be coordinated with the axial segmentation design of the rotor assembly of the motor. Specifically, the magnetic component in the rotor assembly can also be divided into two parts in the axial direction, and the magnetization direction of the magnetic component in the rotor assembly corresponds to the magnetization direction of the permanent magnet in the stator, that is, the magnetization direction of the part of the rotor permanent magnet corresponding to the first permanent magnet is set to N / S pole, and the magnetization direction of the part corresponding to the second permanent magnet is S / N pole, so that the induced back electromotive force of the armature winding of the motor on the two sides differs by 180° in phase, and ultimately its fundamental wave amplitude remains basically unchanged, but the harmonic content is greatly reduced, especially the even harmonics in the synthetic back electromotive force, thereby reducing the motor slot torque and torque ripple.

[0017] In any of the above technical solutions, further, the stator assembly also includes a magnetic isolation block, which is arranged between the first permanent magnet and the second permanent magnet.

[0018] In this technical solution, by arranging a magnetic isolation block between the first permanent magnet and the second permanent magnet, the magnetic fields generated between the first permanent magnet and the second permanent magnet with opposite magnetization directions can be effectively avoided from interfering with each other, ensuring that the first permanent magnet and the second permanent magnet can play their due roles respectively, ensuring that the magnetic density harmonic components modulated and generated between the stator assembly and the rotor assembly can be further increased, thereby generating more working harmonics and further improving the output torque of the motor.

[0019] In any of the above technical solutions, further, there are multiple stator main teeth, and the multiple stator main teeth are distributed along the circumference of the stator yoke; the number of permanent magnets satisfies: Par=(a-1)×x; where Par is the number of permanent magnets, a is the number of auxiliary teeth on each tooth shoe, and x is the number of stator main teeth.

[0020] In this technical solution, the number of stator main teeth can be set to multiple, and the multiple stator main teeth are distributed along the circumference of the stator yoke, thereby ensuring the number of windings wound on the stator main teeth in the stator assembly, and further ensuring that the magnetic field generated by the permanent magnet during the operation of the motor can effectively cooperate with the windings, thereby ensuring the operating efficiency of the motor.

[0021] Based on multiple stator main teeth, the number of permanent magnets should satisfy the following equation: Par = (a-1) × x, where Par is the number of permanent magnets, a is the number of auxiliary teeth on each tooth shoe, and x is the number of stator main teeth. In other words, a permanent magnet is placed in the groove between any two adjacent auxiliary teeth. This ensures that during motor operation, the permanent magnets generate a sufficient magnetic field to coordinate with the rotor assembly. This ensures that the permanent magnets, through modulation of the rotor teeth on the rotor assembly, generate sufficient operating harmonics to complement the operating harmonics modulated by the magnetic components of the rotor assembly through the stator main teeth, thereby generating more operating harmonics and further improving the motor's output torque.

[0022] In any of the above technical solutions, further, there is a winding groove between two adjacent tooth bodies, and a notch between two adjacent tooth shoes, and the notch is connected to the winding groove; in the circumferential direction of the stator assembly, the size of the groove is not equal to the size of the notch.

[0023] In this technical solution, there is a winding groove between the tooth bodies of two adjacent stator main teeth, so that when the winding is wound on the tooth body of the stator main teeth, it can be accommodated in the winding groove, ensuring the rationality of the placement of the winding groove, thereby ensuring the number of windings and further ensuring the operating efficiency of the motor.

[0024] Furthermore, a slot is provided between adjacent tooth shoes, and the slot is connected to the winding slot. The provision of the slot facilitates adjustment of the air gap magnetic field harmonic amplitude and the rotor eddy current density, thereby ensuring stability during motor operation and reducing eddy current losses. Specifically, the air gap magnetic field harmonic amplitude and the rotor eddy current density can be adjusted by setting the slot width to meet the different operating requirements of the motor.

[0025] In the circumferential direction of the stator assembly, the size of the groove between two adjacent auxiliary teeth and the size of the notch between the tooth shoes of two adjacent stator main teeth may be set to be unequal.

[0026] By setting the sizes of the grooves and slots to be unequal, the uniformity of the circumferential distribution of the auxiliary teeth on all stator main teeth can be changed, thereby reducing the number of periods of the air gap magnetic permeance. By reducing the number of periods of the air gap magnetic permeance, the harmonic component of the magnetic flux density generated by modulation will increase, thereby generating more working harmonics, further improving the output torque of the motor.

[0027] In any of the above technical solutions, further, the at least two auxiliary teeth include a first auxiliary tooth and a second auxiliary tooth; in the circumferential direction of the stator assembly, the first auxiliary tooth and the second auxiliary tooth are located at opposite ends of the tooth shoe.

[0028] In this technical solution, the at least two auxiliary teeth include a first auxiliary tooth and a second auxiliary tooth. The first and second auxiliary teeth are located at opposite ends of the tooth shoe in the circumferential direction of the stator assembly, with a notch formed between adjacent first and second auxiliary teeth. Furthermore, both the first and second auxiliary teeth can serve as magnetic field modulation components to enhance the performance of the motor incorporating this stator assembly.

[0029] Specifically, first and second auxiliary teeth are provided at opposite ends of the tooth shoe, respectively. The first and second auxiliary teeth are located at opposite ends of the tooth shoe, circumferentially relative to the stator assembly. By providing at least two auxiliary teeth on the tooth shoe, both the first and second auxiliary teeth can function as magnetic field modulation components, thereby improving the performance of the motor incorporating this stator assembly.

[0030] In any of the above technical solutions, further, in the circumferential direction of the stator assembly, the sizes of the first auxiliary teeth and the second auxiliary teeth are different.

[0031] In this technical solution, the first and second auxiliary teeth have different sizes around the circumference of the stator assembly. This limited structure effectively optimizes the air gap permeance distribution between the stator and rotor assemblies, increasing the harmonic components of the modulated magnetic flux density. This generates more operating harmonics and further improves the motor's output torque.

[0032] Specifically, a solution can be adopted where the first and second auxiliary teeth are sized differently. For example, the first auxiliary teeth can be larger and the second auxiliary teeth smaller. By limiting the design to unequal sizes for the first and second auxiliary teeth, the air gap permeance distribution between the stator and rotor assemblies can be effectively optimized. This increases the harmonic components of the magnetic flux density generated by modulation, generating more operating harmonics, further improving the motor's output torque, and ultimately enhancing its operating efficiency.

[0033] In any of the above technical solutions, further, in the radial direction of the stator assembly, an angle β is formed between the center lines of two adjacent auxiliary teeth, and satisfies 1≤β / (2π / (x×a))<1.4, where x represents the number of stator main teeth, and a represents the number of auxiliary teeth on each stator main tooth.

[0034] In this technical solution, between two adjacent auxiliary teeth, the tooth bisector of one auxiliary tooth forms an angle β with the tooth bisector of the other auxiliary tooth, satisfying 1 ≤ β / (2π / (x × a)) < 1.4, where x represents the number of stator main teeth and a represents the number of auxiliary teeth per stator main tooth. This further optimizes the structure and distribution of the auxiliary teeth, resulting in larger harmonic amplitudes and higher torque generated by motor modulation, further improving motor efficiency.

[0035] In any of the above technical solutions, further, the distances from the tooth body bisector of the stator main tooth to the two side walls of the groove are equal or unequal.

[0036] In this technical solution, a groove is located between the first and second auxiliary teeth. Furthermore, the present invention optimizes the distribution of the grooves on the tooth shoe, ensuring that the distances from the bisector of the stator main tooth to the two side walls of the groove are equal or unequal. This design achieves an asymmetric arrangement of the tooth shoe (the tooth shoe is asymmetrically positioned about the bisector of the main tooth body). This design alters the air gap permeance distribution, attenuating some harmonics, thereby reducing torque ripple and improving the motor's vibration and noise performance.

[0037] Specifically, in the stator assembly proposed in this invention, grooves are formed between adjacent auxiliary teeth, introducing a significant amount of harmonic components into the air gap flux density. When the permanent magnet magnetomotive force interacts with the harmonic air gap flux density, new harmonic components appear in the air gap flux density. By designing the stator winding based on these harmonic components, these new harmonic components in the air gap flux density can be used as the motor's operating harmonics, providing output torque and effectively improving the motor's torque density.

[0038] In any of the above technical solutions, further, the stator assembly includes a stator yoke; one end of the tooth body is connected to the stator yoke, and the tooth shoe is provided at the other end of the tooth body.

[0039] In this technical solution, the stator assembly can specifically include a stator yoke and stator main teeth arranged on the stator yoke, wherein the stator main teeth include a tooth body and a tooth shoe, one end of the tooth body is connected to the stator yoke, and the tooth shoe is connected to the other end of the tooth body, thereby realizing the connection between the stator main teeth and the stator yoke, and then windings can be arranged on the stator main teeth to achieve coordination with the magnetic field of the rotor permanent magnet when power is applied, thereby realizing the rotation of the rotor assembly.

[0040] In any of the above technical solutions, further, the tooth shoe is detachably connected to the tooth body; and / or the tooth body is detachably connected to the stator yoke.

[0041] In this technical solution, the tooth body of the stator main tooth and the tooth shoe can be set to a detachable connection. At the same time, the tooth body of the stator main tooth and the stator yoke can also be set to a detachable connection. That is, the tooth body of the stator main tooth, the stator yoke and the tooth shoe can be set to a detachable sleeve assembly structure. By setting up the detachable sleeve assembly structure between the tooth body, the tooth shoe and the stator yoke, during the assembly of the stator assembly, the winding can be first wound on the tooth body of the stator main tooth, and then one end of the tooth body can be connected to the stator yoke, and finally the tooth shoe can be installed to the other end of the tooth body. This achieves a simplified winding process during the assembly of the stator assembly, reduces the difficulty of winding, improves the slot fill rate of the winding, improves the output performance of the motor from the perspective of stator preparation, and can also reduce scrap and material waste.

[0042] Specifically, the tooth body of the stator main tooth and the stator yoke can be connected through a concave-convex structure, that is, a groove or a protrusion is provided at one end of the tooth body of the stator main tooth, and correspondingly, a protrusion or groove that matches the groove or protrusion is provided at the corresponding position of the stator yoke, so that the connection between the tooth body of the stator main tooth and the stator yoke can be achieved through the cooperation of the groove and the protrusion.

[0043] Correspondingly, the tooth body and the tooth shoe can also be connected via a concave-convex structure, that is, the tooth shoe and the tooth body are connected via mutually matching protrusions and grooves, so as to simplify the winding process.

[0044] In any of the above technical solutions, further, in the radial direction of the stator assembly, the height of the permanent magnet is smaller than the height of the groove.

[0045] In this technical solution, the relationship between the height of the permanent magnet and the height of the groove is defined in the radial direction of the stator assembly. Specifically, in the radial direction of the stator assembly, the height of the permanent magnet can be set to be smaller than the height of the groove, thereby avoiding the permanent magnet protruding from the outside of the groove and affecting the rotation of the rotor, which is conducive to the rational design of the motor structure and ensures the stability of the motor during operation.

[0046] In any of the above technical solutions, further, the permanent magnet has a polygonal or arc shape.

[0047] Specifically, the permanent magnet may be square or triangular.

[0048] In any of the above technical solutions, further, the stator assembly also includes a winding, which is arranged on the stator main teeth.

[0049] In this technical solution, the stator assembly further includes a winding, wherein the winding is wound on the stator main teeth to ensure that the motor using the stator assembly outputs torque when in operation.

[0050] According to a second aspect of the present invention, a motor is proposed, comprising: a rotor assembly; and a stator assembly as described in any one of the above technical solutions.

[0051] In the motor provided by the present invention, the stator assembly can be configured such that at least a portion is located within the rotor assembly, i.e., an internal stator structure. Specifically, the stator assembly and rotor assembly are arranged concentrically to ensure that the rotor assembly can rotate relative to the stator assembly to achieve power output of the motor. While the stator assembly can be partially located within the rotor assembly, the entire stator assembly can also be axially disposed within the rotor assembly to achieve different coordination between the rotor assembly's permanent magnets and the stator assembly's windings.

[0052] Furthermore, the motor provided by the present invention includes the stator assembly according to the first aspect of the present invention. Therefore, all the beneficial effects of the stator assembly mentioned above are achieved and will not be discussed in detail here.

[0053] In any of the above technical solutions, further, the rotor assembly includes: a rotor core, the rotor core includes a rotor yoke and a plurality of salient poles, the plurality of salient poles are arranged on the rotor yoke, and mounting grooves are formed between adjacent salient poles; a rotor permanent magnet is arranged in the mounting groove.

[0054] In this technical solution, the rotor assembly includes a rotor core and multiple rotor permanent magnets. The rotor core comprises a circular ring portion and multiple salient poles. The multiple salient poles protrude from the inner circumferential wall of the circular ring portion and are spaced apart circumferentially. Multiple permanent magnets are positioned between adjacent salient poles, each magnetizing in the same direction. Thus, the multiple salient poles and the multiple permanent magnets are alternately distributed circumferentially around the circular ring portion.

[0055] Furthermore, multiple permanent magnets with the same magnetization direction are respectively arranged between two adjacent salient poles, and an alternating pole magnetic structure is generated on the annular portion of the rotor core, making the rotor core a salient pole structure. This not only reduces the number of permanent magnets used and the difficulty of manufacturing the alternating pole rotor, but also enhances the magnetic field modulation effect and increases the amplitude of the working sub-magnetic flux density harmonics, resulting in better output performance of the motor. In addition, the alternating distribution of multiple salient poles and multiple permanent magnets on the annular portion of the rotor core in the present invention avoids the problem of reduced number of magnetic poles and decreased amplitude of the fundamental magnetic field after the use of alternating poles in the related art, which leads to decreased torque. Moreover, during the operation of the motor, the permanent magnets in the stator assembly can generate working harmonics through the salient pole modulation on the rotor assembly. At the same time, the rotor permanent magnets on the rotor assembly can also modulate working harmonics through the stator main teeth, thereby further increasing the magnetic flux density harmonic components modulated between the stator assembly and the rotor assembly, thereby generating more working harmonics and further improving the output torque of the motor. Specifically, in the axial direction of the rotor core, the rotor core can include two parts, namely a first rotor core and a second rotor core, and the first rotor core and the second rotor core have the same structure. Furthermore, rotor permanent magnets are provided between adjacent salient poles of the first rotor core and the second rotor core, and the centerline of the salient pole of the first rotor core is aligned with the centerline of the rotor permanent magnet in the second rotor core. Accordingly, the centerline of the rotor permanent magnet in the first rotor core is aligned with the centerline of the salient pole of the second rotor core. Furthermore, the rotor permanent magnet in the first rotor core is positioned opposite to the first permanent magnet in the stator assembly and has the same magnetization direction, and the rotor permanent magnet in the second rotor core is positioned opposite to the second permanent magnet in the stator assembly and has the same magnetization direction. That is, the rotor permanent magnet in the first rotor core and the rotor permanent magnet in the second rotor core have opposite magnetization directions.

[0056] Through the above design, the axial segmentation setting of the motor is realized, so that the phase difference of the induced back EMF of the armature winding of the motor on the two sides is 180°. Ultimately, its fundamental amplitude remains basically unchanged, but the harmonic content is greatly reduced, especially the even harmonics in the synthetic back EMF, thereby reducing the motor slot torque and torque ripple.

[0057] In any of the above technical solutions, further, the number of pole pairs of the stator assembly is Pa, the number of pole pairs of the permanent magnet is P1, the number of stator main teeth is x, the number of auxiliary teeth on each stator main tooth is a, and the number of pole pairs of the rotor assembly is Pr, wherein Pa=|a×x±Pr| or Pa=|Pr±P1|.

[0058] In this technical solution, by setting the number of pole pairs of the stator assembly and the number of pole pairs of the permanent magnet to meet a preset relationship, the new harmonic components appearing in the air gap magnetic flux 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.

[0059] Specifically, the number of pole pairs of the stator assembly is Pa, the number of pole pairs of the permanent magnet is P1, the number of stator main teeth is x, the number of auxiliary teeth on each stator main tooth is a, and the number of pole pairs of the rotor assembly is Pr, where Pa=|a×x±Pr| or Pa=|Pr±P1|.

[0060] Specifically, the stator assembly can adopt a six-tooth, two-split structure, i.e., x=6, a=2, the number of stator permanent magnet pole pairs is 6, and the number of rotor pole pairs is 10. Based on the limiting formulas for the stator-side modulation relationship and the rotor-side modulation relationship, Pa=|2×6±10|=2 or 22, specifically 2, or Pa=|10±6|=4 or 16, specifically 4. The optimal number of stator pole pairs calculated is 2 or 4.

[0061] According to a third aspect of the present invention, an electrical device is provided, comprising a motor according to any one of the above technical solutions.

[0062] The electrical equipment provided by the present invention includes the motor of any one of the above technical solutions and thus has all the beneficial effects of the motor, which will not be described in detail here.

[0063] 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

[0064] 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:

[0065] Figure 1 A schematic structural diagram of a stator assembly provided according to an embodiment of the present invention is shown;

[0066] Figure 2 shows a structural schematic diagram of a stator assembly provided according to another embodiment of the present invention;

[0067] Figure 3 shows a structural schematic diagram of a stator assembly provided according to yet another embodiment of the present invention;

[0068] Figure 4 shows a structural schematic diagram of a stator assembly provided according to yet another embodiment of the present invention;

[0069] Figure 5shows a structural schematic diagram of a stator assembly provided according to yet another embodiment of the present invention;

[0070] Figure 6 shows a structural schematic diagram of a stator assembly provided according to yet another embodiment of the present invention;

[0071] Figure 7 A schematic structural diagram of a motor provided according to an embodiment of the present invention is shown;

[0072] Figure 8 shows a structural schematic diagram of a motor provided according to another embodiment of the present invention;

[0073] Figure 9 shows a structural schematic diagram of a motor provided according to yet another embodiment of the present invention;

[0074] Figure 10 A schematic structural diagram of a rotor assembly in a motor provided according to an embodiment of the present invention is shown;

[0075] Figure 11 A schematic structural diagram of a rotor assembly in a motor provided according to another embodiment of the present invention is shown;

[0076] Figure 12 A schematic structural diagram of a rotor assembly in a motor according to another embodiment of the present invention is shown;

[0077] Figure 13 A graph showing the change of no-load back electromotive force over time during operation of a motor according to one embodiment of the present invention is shown;

[0078] Figure 14 A schematic diagram showing the change of the amplitude of each harmonic of the no-load back electromotive force over time during the operation of a motor provided by one embodiment of the present invention is shown.

[0079] in, Figures 1 to 12 The corresponding relationship between the reference numerals and component names is as follows:

[0080] 100 stator assembly, 102 stator main teeth, 104 tooth body, 106 tooth shoe, 108 auxiliary teeth, 110 permanent magnet, 112 first permanent magnet, 114 second permanent magnet, 118 winding, 120 stator yoke, 122 groove, 124 first auxiliary tooth, 126 second auxiliary tooth, 128 winding slot, 130 notch, 200 motor, 202 rotor assembly, 204 rotor yoke, 206 rotor permanent magnet, 208 salient pole, 210 rotor core. DETAILED DESCRIPTION

[0081] 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.

[0082] 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.

[0083] Refer to the following Figures 1 to 14 To describe the stator assembly, motor and electrical equipment provided in some embodiments of the present invention. Figure 13 The middle line L4 represents a curve of the no-load back electromotive force of a section of the motor 200 in the axial direction varying with time, and L5 represents a curve of the no-load back electromotive force of another section of the motor 200 in the axial direction varying with time. Figure 14 In the figure, H1 represents the amplitude of each harmonic of the no-load back EMF of the motor without axial segmentation design, and H2 represents the amplitude of each harmonic of the no-load back EMF of the motor with axial segmentation design.

[0084] The present invention proposes a first aspect, as Figure 1 、 Figure 2 and Figure 3 As shown, a stator assembly 100 is proposed, comprising a stator yoke 120, stator main teeth 102, and permanent magnets 110. The stator main teeth 102 include tooth bodies 104 and tooth shoes 106. One end of the tooth body 104 is connected to the stator yoke 120, and the tooth shoes 106 are connected to the other end of the tooth body 104. At least two auxiliary teeth 108 are disposed at the end of the tooth shoe 106 away from the tooth body 104, with a groove 122 between adjacent auxiliary teeth 108. Furthermore, permanent magnets 110 are disposed within the grooves 122.

[0085] The stator assembly 100 proposed in the present invention includes a stator main tooth 102, which includes a tooth body 104 and a tooth shoe 106. The tooth shoe 106 is connected to one end of the tooth body 104. Furthermore, the other end of the tooth body 104 can be connected to the stator yoke 120, thereby realizing the connection between the stator main tooth 102 and the stator yoke 120. Then, a winding can be set on the stator main tooth 102 to achieve coordination with the magnetic field of the rotor permanent magnet 206 in the rotor assembly 202 of the motor 200 when power is turned on, thereby realizing the rotation of the rotor assembly 202.

[0086] Furthermore, at least two auxiliary teeth 108 are provided at the end of the tooth shoe 106 away from the tooth body 104. Through the provision of at least two auxiliary teeth 108, on the one hand, the at least two auxiliary teeth 108 can be used as magnetic conductive components to conduct magnetism, and on the other hand, the at least two auxiliary teeth 108 can also be used as modulation components to realize the function of magnetic field modulation, so that more harmonic components are introduced into the air gap magnetic permeability, thereby significantly improving the performance of the motor.

[0087] Furthermore, the stator assembly 100 also includes a permanent magnet 110, which is arranged in the groove 122. Through the arrangement of the permanent magnet 110, during the operation of the motor, the permanent magnet 110 can modulate the salient poles 208 on the rotor assembly 202 to generate working harmonics. At the same time, the rotor permanent magnet 206 on the rotor assembly 202 can also modulate the working harmonics through the stator main teeth 102, thereby further increasing the magnetic density harmonic components modulated and generated between the stator assembly 100 and the rotor assembly 202, thereby generating more working harmonics and further improving the output torque of the motor.

[0088] Specifically, the pole pair number of the working harmonics generated between the permanent magnet 110 and the salient pole 208 in the stator assembly 100 is: |Par±i×Pr|, and the pole pair number of the working harmonics modulated by the magnetic components on the rotor through the stator main teeth 102 is: |Pr±i×Zf|, where Zf is the number of air gap magnetic permeability periods on the stator assembly 100 side, Par is the pole pair number of the permanent magnet 110 in the stator assembly 100, Pr is the pole pair number of the rotor assembly 202, and i is an integer greater than or equal to 0.

[0089] The stator assembly 100 provided by the present invention utilizes auxiliary teeth 108, which, in addition to functioning as magnetic permeability components, also function as modulation components, achieving magnetic field modulation. This introduces a greater number of harmonic components into the air gap permeability, significantly improving motor performance. Furthermore, by placing permanent magnets 110 in the grooves 122 between adjacent auxiliary teeth 108, the harmonic components of the magnetic flux density modulated between the stator assembly 100 and the rotor assembly 202 are further increased, thereby generating more operating harmonics and further improving the motor's output torque.

[0090] Specifically, the permanent magnets 110 can be made of ferrite, rare earth permanent magnets, or other magnets with good magnetic conductivity. The permanent magnets 110 can be arranged in a V-shaped or spoke-shaped arrangement. Accordingly, the cross-section of the grooves 122 between the stator main teeth 102 can be configured to match the shape of the permanent magnets 110 to ensure stable installation of the permanent magnets 110.

[0091] Specifically, if Figure 1 As shown, the permanent magnets 110 may be arranged in a Halbach array.

[0092] In the above embodiment, further, Figure 2 and Figure 3 As shown, the permanent magnet 110 includes: a first permanent magnet 112, which is arranged in a groove 122; a second permanent magnet 114, which is arranged in the groove 122, and along the axial direction of the stator assembly 100, the second permanent magnet 114 is located on the side of the first permanent magnet 112; the magnetization direction of the first permanent magnet 112 is opposite to the magnetization direction of the second permanent magnet 114.

[0093] In this embodiment, in the axial direction of the stator assembly 100, the permanent magnet 110 can be divided into at least two parts, that is, the permanent magnet 110 includes a first permanent magnet 112 and a second permanent magnet 114, the second permanent magnet 114 is located on the side of the first permanent magnet 112, and the magnetization direction of the first permanent magnet 112 is set to be opposite to the magnetization direction of the second permanent magnet 114. Specifically, the magnetization direction of the first permanent magnet 112 can be N / S pole, and correspondingly, the magnetization direction of the second permanent magnet 114 is S / N pole.

[0094] like Figure 13 and Figure 14 As shown, the axial segmentation setting of the permanent magnet 110 of the stator assembly 100 can be coordinated with the axial segmentation design of the rotor assembly 202 of the motor. Specifically, the rotor permanent magnet 206 in the rotor assembly 202 can also be divided into two parts in the axial direction, and the magnetization direction of the rotor permanent magnet 206 in the rotor assembly 202 corresponds to the magnetization direction of the permanent magnet 110 in the stator, that is, the magnetization direction of the part of the rotor permanent magnet 206 corresponding to the first permanent magnet 112 is set to N / S pole, and the magnetization direction of the part corresponding to the second permanent magnet 114 is S / N pole, so that the induced back electromotive force of the armature winding of the motor on the two sides differs by 180° in phase, and finally the fundamental wave amplitude remains basically unchanged, but the harmonic content is greatly reduced, especially the even harmonics in the synthetic back electromotive force, thereby reducing the motor slot torque and torque ripple.

[0095] Furthermore, the stator assembly 100 further includes a magnetic isolation block disposed between the first permanent magnet 112 and the second permanent magnet 114 .

[0096] Specifically, by arranging a magnetic isolation block between the first permanent magnet 112 and the second permanent magnet 114, the magnetic fields generated between the first permanent magnet 112 and the second permanent magnet 114 with opposite magnetization directions can be effectively avoided from interfering with each other, ensuring that the first permanent magnet 112 and the second permanent magnet 114 can play their due roles respectively, and ensuring that the magnetic density harmonic components modulated and generated between the stator assembly 100 and the rotor assembly 202 can be further increased, thereby generating more working harmonics and further improving the output torque of the motor.

[0097] In any of the above embodiments, further, Figures 1 to 6 As shown, there are multiple stator main teeth 102, and the multiple stator main teeth 102 are distributed along the circumference of the stator yoke 120; the number of permanent magnets 110 satisfies: Par=(a-1)×x; where Par is the number of permanent magnets 110, a is the number of auxiliary teeth 108 on each tooth shoe 106, and x is the number of stator main teeth 102.

[0098] In this embodiment, the number of stator main teeth 102 can be multiple, and the number of stator main teeth 102 can be set to multiple, and the multiple stator main teeth 102 are distributed along the circumference of the stator yoke 120, so as to ensure the number of windings 118 wound on the stator main teeth 102 in the stator assembly 100, and further ensure that the magnetic field generated by the permanent magnet 110 during the operation of the motor can effectively cooperate with the winding 118, thereby ensuring the operating efficiency of the motor.

[0099] Based on the multiple stator main teeth 102, the number of permanent magnets 110 should satisfy the following equation: Par = (a-1) × x, where Par is the number of permanent magnets 110, a is the number of auxiliary teeth 108 on each tooth shoe 106, and x is the number of stator main teeth 102. That is, a permanent magnet 110 is disposed in each groove 122 between any two adjacent auxiliary teeth 108. This ensures that during motor operation, the permanent magnets 110 can generate a sufficient magnetic field to coordinate with the rotor assembly 202, and that the permanent magnets 110 can generate sufficient operating harmonics through modulation of the salient poles 208 on the rotor assembly 202 to coordinate with the operating harmonics modulated by the rotor permanent magnets 206 on the rotor assembly 202 through the stator main teeth 102, thereby generating more operating harmonics and further improving the motor's output torque.

[0100] Furthermore, the outer edges of the plurality of stator main teeth 102 are located on the circumference of the same circle and are concentric with the stator yoke 120, thereby forming a uniform air gap between the stator main teeth 102 and the rotor. Combined with the grooves 122 between two adjacent auxiliary teeth 108 on the tooth boot 106, an uneven setting of the air gap between the stator assembly 100 and the rotor assembly 202 is achieved, thereby improving the waveform of the air gap magnetic field, making the magnetic field formed by the permanent magnet in the air gap closer to a sinusoidal shape, thereby reducing the cogging torque and torque fluctuation of the motor.

[0101] In any of the above embodiments, further, Figure 4 and Figure 5 As shown, there is a winding groove 128 between two adjacent tooth bodies 104, and a notch 130 between two adjacent tooth shoes 106, and the notch 130 is connected to the winding groove 128; in the circumferential direction of the stator assembly 100, the size of the groove 122 is different from the size of the notch 130.

[0102] In this embodiment, there is a winding groove 128 between the tooth bodies 104 of two adjacent stator main teeth 102, so that when the winding 118 is wound on the tooth body 104 of the stator main tooth 102, it can be accommodated in the winding groove 128, ensuring the rationality of the placement of the winding groove 128, thereby ensuring the number of windings 118 and further ensuring the operating efficiency of the motor.

[0103] Furthermore, a slot 130 is provided between adjacent tooth shoes 106, and slot 130 communicates with winding slot 128. The provision of slot 130 facilitates adjustment of the air gap magnetic field harmonic amplitude and rotor eddy current density, thereby ensuring stability during motor operation and reducing eddy current losses. Specifically, the width of slot 130 can be adjusted to adjust the air gap magnetic field harmonic amplitude and rotor eddy current density to meet different motor operating requirements.

[0104] In the circumferential direction of the stator assembly 100, the size of the groove 122 between two adjacent auxiliary teeth 108 and the size of the notch 130 between the tooth shoes 106 of two adjacent stator main teeth 102 can be set to be unequal. Specifically, in the circumferential direction of the stator assembly 100, the width of the groove 122 can be set to be unequal to the width of the notch 130.

[0105] Specifically, if Figure 6 As shown, in the circumferential direction of the stator assembly 100, the size of the groove 122 is larger than the size of the slot 130. Specifically, in the circumferential direction of the stator assembly 100, the width of the groove 122 between two adjacent auxiliary teeth 108 is d1, and the width of the slot 130 is d2, and d1>d2 is satisfied.

[0106] By setting the sizes of the grooves 122 and the slots 130 to be unequal, the uniformity of the circumferential distribution of the auxiliary teeth 108 on all the stator main teeth 102 can be changed, thereby reducing the number of periods of the air gap magnetic permeance. By reducing the number of periods of the air gap magnetic permeance, the harmonic components of the magnetic flux density generated by modulation will increase, thereby generating more working harmonics, thereby further improving the output torque of the motor.

[0107] In any of the above embodiments, further, Figure 4 and Figure 5 As shown, the at least two auxiliary teeth 108 include a first auxiliary tooth 124 and a second auxiliary tooth 126 . In the circumferential direction of the stator assembly 100 , the first auxiliary tooth 124 and the second auxiliary tooth 126 are located at opposite ends of the tooth shoe 106 .

[0108] In this embodiment, the at least two auxiliary teeth 108 include a first auxiliary tooth 124 and a second auxiliary tooth 126. The first auxiliary tooth 124 and the second auxiliary tooth 126 are located at opposite ends of the tooth shoe 106 in the circumferential direction of the stator assembly 100, and a slot 130 is formed between adjacent first and second auxiliary teeth 124, 126. Furthermore, the first and second auxiliary teeth 124, 126 can both serve as magnetic field modulation components to enhance the performance of a motor incorporating the stator assembly 100.

[0109] Specifically, first and second auxiliary teeth 124, 126 are provided at opposite ends of the tooth shoe 106, respectively. The first and second auxiliary teeth 124, 126 are located at opposite ends of the tooth shoe 106 in the circumferential direction of the stator assembly 100. By providing at least two auxiliary teeth 108 on the tooth shoe 106, both the first and second auxiliary teeth 124, 126 can serve as magnetic field modulation components, thereby improving the performance of the motor in which the stator assembly 100 is employed.

[0110] Furthermore, in the circumferential direction of the stator assembly 100 , the sizes of the first auxiliary teeth 124 and the second auxiliary teeth 126 are different.

[0111] Specifically, the first and second auxiliary teeth 124, 126 have different sizes in the circumferential direction of the stator assembly 100. Thus, by defining the structures of the first and second auxiliary teeth 124, 126, the air gap permeance distribution between the stator assembly 100 and the rotor assembly 202 is effectively optimized, increasing the harmonic components of the magnetic flux density generated by modulation. This means that more operating harmonics are generated, further improving the motor's output torque.

[0112] Specifically, a solution can be adopted in which the first auxiliary teeth 124 and the second auxiliary teeth 126 are sized differently. For example, the first auxiliary teeth 124 can be larger, while the second auxiliary teeth 126 can be smaller. By limiting the structure of the first auxiliary teeth 124 and the second auxiliary teeth 126 to a design with different sizes, the air gap permeance distribution between the stator assembly 100 and the rotor assembly 202 can be effectively optimized. The harmonic components of the magnetic flux density generated by modulation will be increased, that is, more operating harmonics will be generated, the output torque of the motor will be further improved, and the operating efficiency of the motor will be improved.

[0113] In any of the above embodiments, further, Figure 6 As shown, in the radial direction of the stator assembly 100 , an angle β is formed between the center lines of two adjacent auxiliary teeth 108 , and satisfies 1≤β / (2π / (x×a))<1.4, where x represents the number of stator main teeth 102 and a represents the number of auxiliary teeth 108 on each stator main tooth 102 .

[0114] In this embodiment, between two adjacent auxiliary teeth 108, an angle β is formed between the tooth body 104 bisector L2 of one auxiliary tooth 108 and the tooth body 104 bisector L3 of the other auxiliary tooth 108, satisfying 1≤β / (2π / (x×a))<1.4, where x represents the number of stator main teeth 102 and a represents the number of auxiliary teeth 108 on each stator main tooth 102. Thus, the present invention further optimizes the structure and distribution of the auxiliary teeth 108, resulting in larger harmonic amplitudes and higher torque generated by motor modulation, further improving motor efficiency.

[0115] Specifically, the auxiliary teeth 108 may include only a first auxiliary tooth 124 and a second auxiliary tooth 126 disposed at both ends of the tooth shoe 106. That is, there are two auxiliary teeth 108, and the number of stator main teeth 102 is six. Accordingly, the angle β between the tooth body 104 bisector L2 of the first auxiliary tooth 124 and the tooth body 104 bisector L3 of the second auxiliary tooth 126 satisfies 1≤β / (2π / (6×2))<1.4. This allows the motor modulation using this stator assembly 100 to generate larger harmonic amplitudes and higher torque, further improving the operating efficiency of the motor 200.

[0116] In any of the above embodiments, further, Figure 6 As shown, the distances between the bisector of the tooth body 104 of the stator main tooth 102 and the two side walls of the groove 122 are equal or unequal.

[0117] In this embodiment, a groove 122 is provided between the first auxiliary tooth 124 and the second auxiliary tooth 126. Furthermore, the present invention optimizes the distribution of the groove 122 on the tooth shoe 106, ensuring that the distances from the bisector L1 of the tooth body 104 of the stator main tooth 102 to the sidewalls of the groove 122 are equal or unequal. This design achieves an asymmetric arrangement of the tooth shoe 106 (the tooth shoe 106 is asymmetrically positioned about the bisector L1 of the tooth body 104). This design alters the air gap permeance distribution, attenuating some harmonics, thereby reducing torque ripple and improving the motor's vibration and noise performance.

[0118] Specifically, the distances from the bisector L1 of the tooth body 104 of the stator main tooth 102 to the two side walls of the groove 122 are equal. Thus, in the circumferential direction of the stator assembly 100, the groove 122 is located in the middle of the tooth shoe 106. This design simplifies the overall structure of the stator main tooth 102 and facilitates the processing and manufacturing of the stator main tooth 102, thereby improving the processing efficiency of the stator assembly 100 and the entire motor. Specifically, in the circumferential direction of the stator assembly 100, the distances from the bisector L1 of the tooth body 104 of the stator main tooth 102 to the two side walls of the groove 122 are d3 and d4, respectively, and d3 equals d4.

[0119] Furthermore, the distances from the bisector L1 of the tooth body 104 of the stator main tooth 102 to the two side walls of the groove 122 may also be unequal. In this way, in the circumferential direction of the stator assembly 100, the groove 122 is offset toward one end of the tooth shoe 106. This arrangement can change the air gap permeability distribution, weaken some harmonics, thereby reducing torque pulsation and improving the vibration and noise performance of the motor. In addition, when the permanent magnet magnetomotive force and the air gap permeability containing harmonics interact, new harmonic components will appear in the air gap magnetic flux. At this time, at least two auxiliary teeth 108 introduce more harmonic components into the air gap permeability, which significantly improves the performance of the motor.

[0120] Specifically, in the stator assembly 100 proposed in the present invention, a groove 122 is formed between two adjacent auxiliary teeth 108, which introduces a large number of harmonic components into the air gap flux. When the permanent magnet magnetomotive force interacts with the harmonic air gap flux, new harmonic components appear in the air gap flux density. By designing the stator winding 118 based on these harmonic components, the new harmonic components in the air gap flux density can be used as operating harmonics of the motor 200, providing output torque for the motor 200, thereby effectively improving the torque density of the motor 200.

[0121] Furthermore, the stator assembly 100 includes at least two stacks, and the stator assembly 100 is manufactured by stacking at least two stacks. In this way, during the manufacturing process of the stator assembly 100, the staff can first perform operations such as winding on a single stack.

[0122] In particular, compared with the prior art that requires winding operations on an integral iron core, the stacked body proposed in the present invention has a larger operating space, which is conducive to reducing the difficulty of winding, thereby improving the winding work efficiency and reducing material costs.

[0123] Furthermore, the present invention allows winding and other operations to be performed initially on a single stack, effectively increasing the number of coils wound in winding 118 and improving the slot fill rate of winding 118, thereby enhancing the output performance of the applied motor. Furthermore, while reducing the winding difficulty, the present invention can also reduce the scrap rate during the winding process, thereby reducing waste and improving the cost of stator assembly 100. Furthermore, the lower material requirements of a single stack can improve the utilization rate of the core material, thereby reducing the material cost of stator assembly 100.

[0124] Specifically, the yoke section of a stacked body may include one stator main tooth 102, or may include two or more stator main teeth 102. The yoke sections of two adjacent stacked bodies are detachably connected, thereby ensuring the assembly and disassembly of the two adjacent stacked bodies.

[0125] Furthermore, the stator assembly 100 also includes a first connecting portion and a second connecting portion. The first connecting portion is arranged at the first end of the yoke section, and the second connecting portion is arranged at the second end of the yoke section, and the first end and the second section are arranged relative to each other on the yoke section. Furthermore, the structures of the first connecting portion and the second connecting portion match, and the first connecting portion and the second connecting portion cooperate to achieve self-locking. Specifically, one of the first connecting portion and the second connecting portion is a convex portion, and the other is a concave portion. Furthermore, the shape of the convex portion matches the shape of the concave portion, and the convex portion and the concave portion can be detachably connected and have a self-locking function.

[0126] Furthermore, the stator assembly 100 further includes a fixing member (not shown in the figure). After two adjacent stacks are spliced together, the present invention further fixes the entire structure with the fixing member, thereby further improving the structural stability of the spliced stacks.

[0127] Specifically, the fixing member may be an insulating frame, so that the insulating frame can fix the stacked body on the basis of ensuring insulation, thereby realizing the multi-purpose of the insulating frame.

[0128] In addition, two adjacent stacks can also be connected by welding. After the two adjacent stacks are spliced together, the present invention further fixes the overall structure by welding, thereby further improving the structural stability of the spliced stack.

[0129] In addition, two adjacent stacked bodies can also be integrally injection molded. That is, after the two adjacent stacked bodies are spliced together, the present invention further fixes the overall structure by integrally injection molding, thereby further improving the structural stability of the spliced stacked bodies.

[0130] In any of the above embodiments, further, Figure 4 and Figure 5 As shown, the tooth shoe 106 is detachably connected to the tooth body 104 ; and / or the tooth body 104 is detachably connected to the stator yoke 120 .

[0131] In this embodiment, the tooth body 104 of the stator main tooth 102 and the tooth shoe 106 can be detachably connected. Simultaneously, the tooth body 104 of the stator main tooth 102 and the stator yoke 120 can also be detachably connected. That is, a separable sleeve assembly structure can be provided between the tooth body 104 of the stator main tooth 102, the stator yoke 120, and the tooth shoe 106. By providing the separable sleeve assembly structure between the tooth body 104, the tooth shoe 106, and the stator yoke 120, during the assembly of the stator assembly 100, the coil of the winding 118 can be first wound around the tooth body 104 of the stator main tooth 102, then one end of the tooth body 104 can be connected to the stator yoke 120, and finally, the tooth shoe 106 can be installed to the other end of the tooth body 104. This simplifies the winding process during the assembly of the stator assembly 100, reduces the difficulty of winding, increases the slot fill rate of the winding 118, improves the output performance of the motor, and reduces scrap and material waste.

[0132] Specifically, the tooth body 104 of the stator main tooth 102 and the stator yoke 120 can be connected through a concave-convex structure, that is, a groove 122 or a protrusion is provided at one end of the tooth body 104 of the stator main tooth 102, and correspondingly, a protrusion or groove 122 that matches the groove 122 or the protrusion is provided at a corresponding position of the stator yoke 120, so that the connection between the tooth body 104 of the stator main tooth 102 and the stator yoke 120 can be achieved through the cooperation of the groove 122 and the protrusion.

[0133] Correspondingly, the tooth body 104 and the tooth shoe 106 can also be connected via a concave-convex structure, that is, the tooth shoe 106 and the tooth body 104 are connected via mutually matching protrusions and grooves 122 to simplify the winding process.

[0134] In any of the above embodiments, further, Figures 1 to 5 As shown, in the radial direction of the stator assembly 100 , the height of the permanent magnet 110 is smaller than the height of the groove 122 .

[0135] In this embodiment, the relationship between the height of the permanent magnet 110 and the height of the groove 122 is defined in the radial direction of the stator assembly 100. Specifically, in the radial direction of the stator assembly 100, the height of the permanent magnet 110 can be set to be smaller than the height of the groove 122, thereby preventing the permanent magnet 110 from protruding from the outside of the groove 122 and affecting the rotation of the rotor, which is conducive to the rational design of the motor structure and ensures the stability of the motor during operation.

[0136] Furthermore, the permanent magnet 110 is in a polygonal or arc shape.

[0137] Accordingly, the cross-sectional area of the groove 122 for placing the permanent magnet 110 may be a polygon or an arc shape that matches the shape of the permanent magnet 110 .

[0138] Specifically, the shape of the permanent magnet 110 can be square or triangular. Figure 7 、 Figure 8 and Figure 9 As shown, a motor is proposed, comprising: a rotor assembly 202; and a stator assembly 100 as in any one of the above technical solutions.

[0139] In the motor provided by the present invention, the stator assembly 100 can be configured such that at least a portion is located within the rotor assembly 202, i.e., an inner stator structure. Specifically, the stator assembly 100 and the rotor assembly are arranged concentrically to ensure that the rotor assembly 202 can rotate relative to the stator assembly 100 to achieve power output of the motor. While a portion of the stator assembly 100 is located within the rotor assembly 202, the entire stator assembly 100 in the axial direction can also be disposed within the rotor assembly 202 to achieve different matching methods between the rotor permanent magnets 206 of the rotor assembly and the windings 118 of the stator assembly 100.

[0140] Specifically, the structure of the motor 200 may also be set as an outer stator structure.

[0141] Furthermore, the motor provided by the present invention includes the stator assembly 100 according to the first aspect of the present invention. Therefore, all the beneficial effects of the stator assembly 100 are achieved and will not be discussed in detail here.

[0142] In any of the above embodiments, further, Figure 10 、 Figure 11 and Figure 12 As shown, the rotor assembly 202 includes: a rotor core, the rotor core includes a rotor yoke 204 and a plurality of salient poles 208, the plurality of salient poles 208 are arranged on the rotor yoke 204, and mounting grooves are formed between adjacent salient poles 208; and a rotor permanent magnet 206, which is arranged in the mounting groove.

[0143] In this embodiment, the rotor assembly 202 includes a rotor core 210 and a plurality of rotor permanent magnets 206. The rotor core 210 includes a rotor yoke 204 and a plurality of salient poles 208. The plurality of salient poles 208 protrude from the inner circumferential wall of the rotor yoke 204 and are spaced apart in the circumferential direction of the rotor yoke 204. The plurality of rotor permanent magnets 206 are disposed between two adjacent salient poles 208, and the magnetization directions of the plurality of rotor permanent magnets 206 are the same. Thus, the plurality of salient poles 208 and the plurality of rotor permanent magnets 206 are alternately distributed in the circumferential direction of the rotor yoke 204.

[0144] Furthermore, multiple rotor permanent magnets 206 with the same magnetization direction are respectively arranged between two adjacent salient poles 208, and an alternating pole magnetic structure is generated on the rotor yoke 204 of the rotor core 210, making the rotor core 210 a salient pole 208 structure. In this way, the number of rotor permanent magnets 206 used is reduced, and the manufacturing difficulty of the alternating pole rotor is reduced. At the same time, the magnetic field modulation effect is enhanced, and the amplitude of the working sub-magnetic harmonic is increased, so that the motor produces better output performance. In addition, the multiple salient poles 208 and the multiple rotor permanent magnets 206 are alternately distributed on the rotor yoke 204 of the rotor core 210 in the present invention, which 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 the related art, which leads to decreased torque. Moreover, during the operation of the motor 200, the permanent magnets 110 in the stator assembly 100 can be modulated by the salient poles 208 on the rotor assembly 202 to generate working harmonics. At the same time, the rotor permanent magnets 206 on the rotor assembly 202 can also modulate working harmonics through the stator main teeth 102, thereby further increasing the magnetic density harmonic components modulated and generated between the stator assembly 100 and the rotor assembly 202, thereby generating more working harmonics and further improving the output torque of the motor 200.

[0145] Specifically, in the axial direction of the rotor core 210, the rotor core 210 may include two parts, namely, a first rotor core 210 and a second rotor core 210. The first rotor core 210 and the second rotor core 210 have the same structure. Furthermore, rotor permanent magnets 206 are disposed between adjacent salient poles 208 of each of the first and second rotor cores 210, and the centerlines of the salient poles 208 of the first rotor core 210 and the centerlines of the rotor permanent magnets 206 in the second rotor core 210 are aligned. Accordingly, the centerlines of the rotor permanent magnets 206 in the first rotor core 210 and the centerlines of the salient poles 208 of the second rotor core 210 are aligned. Furthermore, the rotor permanent magnet 206 in the first rotor core 210 is positioned opposite to the first permanent magnet 112 in the stator assembly 100 and has the same magnetization direction, and the rotor permanent magnet 206 in the second rotor core 210 is positioned opposite to the second permanent magnet 114 in the stator assembly 100 and has the same magnetization direction.

[0146] Through the above design, the axial segmented setting of the motor 200 is realized, so that the phase difference of the induced back electromotive force of the armature winding 118 of the motor on the two sides is 180°. Ultimately, the fundamental wave amplitude remains basically unchanged, but the harmonic content is greatly reduced, especially the even harmonics in the synthetic back electromotive force, thereby reducing the tooth slot torque and torque ripple of the motor 200.

[0147] Specifically, if Figure 10 As shown, the rotor permanent magnets 206 may be arranged in a Halbach Array.

[0148] In any of the above embodiments, further, the number of pole pairs of the stator assembly 100 is Pa, the number of pole pairs of the rotor permanent magnet 206 is P1, the number of stator main teeth 102 is x, the number of auxiliary teeth 108 on each stator main tooth 102 is a, and the number of pole pairs of the rotor assembly 202 is Pr, where Pa=|a×x±Pr| or Pa=|Pr±P1|.

[0149] In this embodiment, by setting the number of pole pairs of the stator assembly 100 and the number of pole pairs of the permanent magnet 110 to meet a preset relationship, the new harmonic components appearing in the air gap magnetic flux can be used as the working harmonics of the motor 200 to provide output torque for the motor, thereby effectively improving the torque density of the motor 200.

[0150] Specifically, the number of pole pairs of the stator assembly 100 is Pa, the number of pole pairs of the permanent magnet 110 is P1, the number of stator main teeth 102 is x, the number of auxiliary teeth 108 on each stator main tooth 102 is a, and the number of pole pairs of the rotor assembly is Pr, where Pa=|a×x±Pr| or Pa=|Pr±P1|.

[0151] Specifically, the stator assembly can adopt a six-tooth two-split structure, i.e., x=6, a=2, the number of pole pairs of the stator permanent magnet 110 is 6, and the number of pole pairs of the rotor assembly 202 is 10. Then, according to the limiting formulas for the modulation relationship on the stator assembly 100 side and the modulation relationship on the rotor assembly 202 side, Pa=|2×6±10|=2 or 22, specifically 2, or Pa=|10±6|=4 or 16, specifically 4. Therefore, the optimal number of pole pairs of the stator assembly 100 obtained by calculation is 2 or 4.

[0152] According to a third aspect of the present invention, an electrical device is provided, comprising the motor 200 according to any one of the above embodiments.

[0153] Specifically, the electrical appliances may include air conditioners, washing machines, vacuum cleaners, etc.

[0154] The electrical equipment provided by the present invention includes the motor of any one of the above technical solutions and thus has all the beneficial effects of the motor, which will not be described in detail here.

[0155] 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.

[0156] 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.

[0157] 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 motor, characterized in that: include: A stator assembly and a rotor assembly, wherein the stator assembly comprises: stator yoke; stator main teeth, each stator main tooth comprising a tooth body and a tooth shoe, one end of the tooth body being connected to the stator yoke, and the tooth shoe being connected to the other end of the tooth body; The end of the tooth shoe away from the tooth body is provided with at least two auxiliary teeth, and a groove is provided between two adjacent auxiliary teeth; A permanent magnet is disposed in the groove; the permanent magnet includes: a first permanent magnet disposed in the groove; a second permanent magnet disposed in the groove, and along the axial direction of the stator assembly, the second permanent magnet is located on the side of the first permanent magnet; the magnetization direction of the first permanent magnet is opposite to the magnetization direction of the second permanent magnet; a magnetic isolation block, disposed between the first permanent magnet and the second permanent magnet; The rotor assembly includes: a rotor core, the rotor core including a rotor yoke and a plurality of salient poles, the plurality of salient poles being arranged on the rotor yoke, with mounting slots formed between adjacent salient poles; a rotor permanent magnet disposed in the mounting slot; and in the axial direction of the rotor core, the rotor core including a first rotor core and a second rotor core, the rotor permanent magnets in the first rotor core being positioned opposite to the first permanent magnets and having the same magnetization direction, and the rotor permanent magnets in the second rotor core being positioned opposite to the second permanent magnets and having the same magnetization direction. In the radial direction of the stator assembly, an angle β is formed between the center lines of two adjacent auxiliary teeth, and satisfies 1≤β / (2π / (x×a))<1.4, where x represents the number of the stator main teeth, and a represents the number of the auxiliary teeth on each stator main tooth.

2. The motor according to claim 1, characterized in that There are multiple stator main teeth, and the multiple stator main teeth are distributed along the circumference of the stator yoke; The number of the permanent magnets satisfies: Par=(a-1)×x; Wherein, Par is the number of permanent magnets, a is the number of auxiliary teeth on each tooth shoe, and x is the number of stator main teeth.

3. The motor according to claim 1, characterized in that There is a winding groove between two adjacent tooth bodies, and there is a notch between two adjacent tooth shoes, and the notch is connected to the winding groove; In the circumferential direction of the stator assembly, the size of the groove is different from the size of the notch.

4. The motor according to claim 3, characterized in that The at least two auxiliary teeth include a first auxiliary tooth and a second auxiliary tooth; In the circumferential direction of the stator assembly, the first auxiliary teeth and the second auxiliary teeth are located at opposite ends of the tooth shoe.

5. The motor according to claim 4, characterized in that In a circumferential direction of the stator assembly, sizes of the first auxiliary teeth and the second auxiliary teeth are different.

6. The motor according to claim 4, characterized in that The distances between the tooth body bisector of the stator main tooth and the two side walls of the groove are equal or unequal.

7. The electric motor according to any one of claims 1 to 6, characterized in that The tooth shoe is detachably connected to the tooth body; and / or The tooth body is detachably connected to the stator yoke.

8. The motor according to any one of claims 1 to 6, characterized in that In a radial direction of the stator assembly, a height of the permanent magnet is smaller than a height of the groove.

9. The electric motor according to any one of claims 1 to 6, characterized in that The permanent magnet is in the shape of a polygon or an arc.

10. The electric motor according to any one of claims 1 to 6, characterized in that Also includes: The winding is arranged on the stator main teeth.

11. The motor according to claim 1, characterized in that The number of pole pairs of the stator assembly is Pa, the number of pole pairs of the permanent magnet is P1, the number of the stator main teeth is x, the number of auxiliary teeth on each stator main tooth is a, and the number of pole pairs of the rotor assembly is Pr. Among them, Pa=|a×x±Pr| or Pa=|Pr±P1|.

12. An electrical device, characterized in that: include: A motor as claimed in any one of claims 1 to 11.

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