Stator assemblies, motors and electrical equipment

Abstract

The present invention provides a stator assembly, motor, and electrical equipment, wherein the stator assembly includes: a stator yoke; stator main teeth, each stator main tooth including a tooth body and a tooth shoe, one end of the tooth body connected to the stator yoke, and the tooth shoe connected to the other end of the tooth body, at least two auxiliary teeth provided at the end of the tooth shoe away from the tooth body, and each auxiliary tooth end provided with a spline surface; wherein the distance between at least a portion of the spline surface and the center of the stator yoke gradually increases or decreases from the first end to the second end of the tooth shoe. The stator assembly provided by the present invention not only improves the waveform of the air gap magnetic field and reduces the cogging torque and torque ripple of the motor, but also changes the air gap magnetic permeance distribution, reducing the number of air gap magnetic permeance periods, thereby generating more operating harmonics and further improving the torque output of the motor.

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 the related art, during the operation of the motor, the operating harmonics generated between the stator assembly and the rotor assembly are relatively small, and the output torque of the motor is limited. 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 an electric 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 yoke; a stator main tooth, the 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, at least two auxiliary teeth being provided at the end of the tooth shoe away from the tooth body, and a spline surface being provided at the end of any auxiliary tooth; wherein, from the first end of the tooth shoe to the second end of the tooth shoe, the distance between at least a portion of the spline surface and the center of the stator yoke gradually increases or decreases.

[0008] The stator assembly proposed in the present invention includes 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 permanent magnet when power is applied, thereby realizing the rotation of the motor rotor.

[0009] Furthermore, at least two auxiliary teeth are provided at the end of the tooth shoe away from the tooth body. These two auxiliary teeth function as magnetic permeability components, both for magnetic conduction and modulation, to achieve magnetic field modulation. This introduces more harmonic components into the air gap permeability, significantly improving motor performance.

[0010] Furthermore, the distance between at least a portion of the spline surface and the center of the stator yoke gradually increases or decreases from the first end of the tooth shoe to the second end of the tooth shoe. This changes the air gap permeance distribution, 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.

[0011] The stator assembly provided by the present invention comprises at least two auxiliary teeth disposed on the tooth shoe of the stator main teeth, and the distance between at least a portion of the spline surface and the center of the stator yoke is configured to gradually increase or decrease from the first end of the tooth shoe to the second end of the tooth shoe. This not only achieves the formation of an uneven air gap between the stator assembly and the rotor, thereby improving the waveform of the air gap magnetic field, reducing the cogging torque and torque ripple of the motor, and enhancing the reliability of the motor, but also modifies the air gap magnetic permeance distribution, reducing the number of air gap magnetic permeance periods, thereby increasing the harmonic components of the modulated magnetic field density, generating more operating harmonics, and further improving the motor's output torque.

[0012] The stator assembly provided by the present invention may also have the following additional technical features:

[0013] In the above technical solution, further, the spline surface includes: a main spline surface, which is arranged at one end of the tooth body; and a secondary spline surface, which is connected to the main spline surface. From the first end of the tooth shoe to the second end of the tooth shoe, the distance between the secondary spline surface and the center of the stator yoke gradually increases or decreases.

[0014] In this technical solution, the spline surface can include a primary spline surface and a secondary spline surface. The primary spline surface is provided at one end of the tooth body, and the secondary spline surface is connected to the primary spline surface. Furthermore, the distance between the secondary spline surface and the center of the stator yoke gradually increases or decreases from the first end of the tooth shoe to the second end of the tooth shoe. This achieves a gradual increase or decrease in the distance between at least a portion of the spline surface at the end of the secondary tooth and the center of the stator yoke, thereby changing the air gap permeance distribution and 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 will increase, generating more operating harmonics and further improving the motor's output torque.

[0015] In any of the above technical solutions, further, from the first end of the tooth shoe to the second end of the tooth shoe, the distance between the main spline surface and the center of the stator yoke remains unchanged.

[0016] In this technical solution, by setting the main spline surface to maintain a constant distance from the center of the stator yoke, and thereby cooperating with the setting of the secondary spline surface, when the stator assembly is connected to the rotor assembly, an uneven air gap can be formed between the secondary teeth of the stator assembly and the rotor assembly, 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, and reducing the cogging torque and torque fluctuation of the motor.

[0017] In any of the above technical solutions, further, the sub-spline surface includes at least a spline plane; and / or the sub-spline surface includes at least a first spline curved surface; and / or the main spline surface includes a second spline curved surface.

[0018] In this technical solution, the secondary spline surface can include a spline plane, that is, the spline surface at the end of the secondary tooth includes at least a section of a spline plane. By setting the secondary spline surface as a spline plane, it can be ensured that the distance between the secondary spline surface and the center of the stator yoke can gradually increase or decrease from the first end of the tooth shoe to the second end of the tooth shoe. This changes the air gap permeability distribution, so that the number of air gap permeability periods is reduced. When the number of air gap permeability periods is reduced, the harmonic components of the magnetic flux density generated by modulation will increase, that is, more working harmonics will be generated, and the output torque of the motor will be further improved. In combination with the setting of the main spline surface, when the stator assembly is connected to the rotor assembly, an uneven air gap can be formed between the secondary teeth of the stator assembly and the rotor assembly, 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 sine shape, and reducing the cogging torque and torque fluctuation of the motor.

[0019] Furthermore, the secondary spline surface can also include a first spline surface. That is, the spline surface at the end of the secondary tooth includes at least a section of the first spline surface. By adjusting the extension direction of the first spline surface, the distance between the secondary spline surface and the center of the stator yoke can also be gradually increased or decreased, thereby achieving the effect of improving the motor's output torque. This, combined with the configuration of the primary spline surface, can also achieve the goal of reducing the motor's cogging torque and torque ripple.

[0020] Furthermore, the primary spline surface may include a secondary spline surface. Specifically, when viewed along the axial direction of the stator assembly, the extension direction of the second spline surface may lie concentrically with the stator yoke, thereby ensuring that the distance between the second spline surface and the center of the stator yoke remains constant, that is, the distance between the primary spline surface and the center of the stator yoke remains constant. Furthermore, in conjunction with the provision of the secondary spline surface, when the stator assembly is mated with the rotor assembly, a non-uniform air gap is formed between the stator assembly's secondary teeth and the rotor assembly. This improves the waveform of the air gap magnetic field, making the magnetic field formed by the permanent magnets in the air gap more sinusoidal, thereby reducing the cogging torque and torque ripple of the motor.

[0021] Furthermore, the primary spline surface includes a second spline surface, and the secondary spline surface includes both a spline plane and a first spline surface, wherein the second spline surface is provided at one end of the tooth body, the first spline surface is connected to the second spline surface, and the spline plane is connected to the first spline surface. Alternatively, the spline plane is connected to the second spline surface, and the first spline surface is connected to the spline plane.

[0022] In any of the above technical solutions, further, the auxiliary teeth include a first auxiliary tooth and a second auxiliary tooth; the spline surface includes a first spline surface and a second spline surface, the first spline surface is located on the first auxiliary tooth, and the second spline surface is located on the second auxiliary tooth; wherein, the first spline surface and the second spline surface are asymmetric with respect to the tooth body bisector.

[0023] 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. Furthermore, both the first and second auxiliary teeth can serve as magnetic field modulation components to enhance the performance of a motor incorporating this stator assembly.

[0024] Furthermore, the spline surface includes a first spline surface and a second spline surface, wherein the first spline surface is located on the first auxiliary tooth and the second spline surface is located on the second auxiliary tooth, and the first spline surface and the second spline surface are asymmetric about the centerline of the stator main tooth body. This arrangement can change the air gap permeance 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 permeance containing harmonics interact, new harmonic components appear in the air gap magnetic flux. At this time, at least two stator auxiliary teeth introduce more harmonic components into the air gap permeance, significantly improving the performance of the motor.

[0025] 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; 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.

[0026] 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.

[0027] Specifically, 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.

[0028] Furthermore, a notch is provided between two adjacent tooth shoes, and the notch is connected to the winding slot. The provision of the notch can reduce the starting torque of the motor, improve the air gap magnetic field waveform, and reduce additional losses. It is also beneficial to adjust 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 air gap magnetic field harmonic amplitude and rotor eddy current density can be adjusted by setting the width of the notch to meet the different operating requirements of the motor.

[0029] In any of the above technical solutions, further, a groove is provided between two adjacent auxiliary teeth on the same stator main tooth; and in the circumferential direction of the stator assembly, the size of the groove is not equal to the size of the notch.

[0030] In this technical solution, on the same stator main tooth, there is a groove between two adjacent auxiliary teeth, thereby separating the two adjacent auxiliary teeth and ensuring the unevenness of the air gap between the stator main teeth and the rotor assembly, thereby improving the waveform of the air gap magnetic field and making the magnetic field formed by the permanent magnet in the air gap closer to the sinusoidal shape, so as to reduce the cogging torque and torque fluctuation of the motor and ensure the stability of the motor during operation.

[0031] Furthermore, 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 can be set to be unequal. Specifically, in the circumferential direction of the stator assembly, the width of the groove can be set to be unequal to the width of the notch.

[0032] 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.

[0033] In any of the above technical solutions, further, in two adjacent stator main teeth, there is a notch between the auxiliary tooth of one stator main tooth and the auxiliary tooth of the other stator main tooth; at the notch, the distances from the angular bisector of the two adjacent stator main teeth to the two adjacent auxiliary teeth are equal or unequal.

[0034] In this technical solution, the auxiliary teeth on the stator main tooth shoes not only serve as magnetic conductors but also as modulators, modulating the magnetic field. Specifically, the distances from the angle bisectors of two adjacent stator main teeth to the first and second auxiliary teeth can be set to be equal, ensuring uniformity in the air gap magnetic field distribution and facilitating stable motor operation.

[0035] Furthermore, on the basis of ensuring the stability of the motor operation, the distances from the angular bisector of two adjacent stator main teeth to the first auxiliary tooth and the second auxiliary tooth can also be set to be unequal, that is, the tooth boot or slot is offset to one side of the two adjacent stator main teeth, which can change the distribution of the air gap magnetic field and weaken some harmonics in the air gap magnetic field, thereby reducing the torque pulsation during the operation of the motor and improving the vibration and noise performance of the motor.

[0036] In any of the above technical solutions, further, the stator assembly includes at least two stacked bodies, any stacked body includes a yoke segment and stator main teeth, the stator main teeth are arranged on the yoke segment, the yoke segments of two adjacent stacked bodies are connected, and the stator yoke includes multiple yoke segments.

[0037] In this technical solution, the stator assembly includes at least two stacks, which are stacked together to form the stator assembly. This allows workers to perform winding and other operations on a single stack during the manufacturing process. Compared to related techniques that require winding on a single core, the stack proposed in this invention offers greater flexibility, reducing winding complexity, improving winding efficiency, and reducing material costs.

[0038] Furthermore, the present invention allows winding and other operations to be performed initially on a single stack, effectively increasing the number of windings and the slot fill rate of the windings, thereby improving the output performance of the motor incorporating the stator assembly. 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 the stator assembly. Furthermore, the lower material requirements of the individual stacks can improve the utilization rate of the core material, thereby reducing the material cost of the stator assembly.

[0039] In any of the above technical solutions, further, the yoke sections of two adjacent stacked bodies are detachably connected; the stator assembly further includes a fixing member, and the two adjacent stacked bodies are fixed by the fixing member.

[0040] In this technical solution, the yoke sections of two adjacent stacked bodies are detachably connected, thereby ensuring the assembly and disassembly of the two adjacent stacked bodies.

[0041] Specifically, the stator assembly may include a first connecting portion and a second connecting portion. The first connecting portion is disposed at the first end of the yoke segment, and the second connecting portion is disposed at the second end of the yoke segment, with the first end and the second segment being disposed relative to each other on the yoke segment. 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. Therefore, during the process of splicing stacked bodies, the present invention can connect two adjacent stacked bodies via the first connecting portion and the second connecting portion, including a detachable connection between the two adjacent stacked bodies.

[0042] Furthermore, 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 are detachably connected and have a self-locking function. Specifically, the concave portion includes, but is not limited to, a polygonal groove, a circular groove, or an elliptical groove; the shape of the convex portion matches the shape of the concave portion.

[0043] Furthermore, the stator assembly further includes a fixing member, and two adjacent stacked bodies are fixed by the fixing member.

[0044] Specifically, after two adjacent stacks are joined, the overall structure is further secured using fixings, thereby further improving the structural stability of the joined stack. Specifically, the fixings can be insulating frames, which not only ensure insulation but also secure the stacks, thus achieving a multi-purpose insulating frame.

[0045] Specifically, two adjacent stacked bodies are connected by welding. After the two adjacent stacked bodies are spliced ​​together, the present invention further fixes the overall structure by welding, thereby further improving the structural stability of the spliced ​​stacked bodies.

[0046] Specifically, two adjacent stacked bodies are integrally injection molded. That is, after the two adjacent stacked bodies are spliced ​​together, the present invention further fixes the overall structure by integral injection molding, thereby further improving the structural stability of the spliced ​​stacked bodies.

[0047] In any of the above technical solutions, further, in two adjacent auxiliary teeth, an angle β is formed between the tooth body bisector of one auxiliary tooth and the tooth body bisector of the other auxiliary tooth, and satisfies 1≤β / (2π / (a×x))<1.4, where a represents the number of stator main teeth, and x represents the number of auxiliary teeth on each stator main tooth.

[0048] In this technical solution, the angle β between the tooth bisector of one auxiliary tooth and the tooth bisector of the other auxiliary tooth between two adjacent auxiliary teeth satisfies 1≤β / (2π / (ax))<1.4, where a represents the number of stator main teeth and x represents the number of auxiliary teeth on each 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.

[0049] 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.

[0050] 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 coil can be wound on the tooth body of the stator main tooth first, 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.

[0051] 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.

[0052] 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.

[0053] In any of the above technical solutions, further, the stator assembly also includes a winding, the winding includes a plurality of coils, and each coil is wound around a stator main tooth.

[0054] In this technical solution, the stator assembly further comprises a winding, which comprises a plurality of coils. Specifically, the coils are wound around the stator main teeth to ensure that the motor using the stator assembly outputs torque when in operation.

[0055] Furthermore, each coil is wound around only one stator main tooth, employing a single-tooth concentrated winding structure. This results in smaller winding ends, which helps reduce copper loss, facilitates modularization, and improves manufacturing efficiency. According to a second aspect of the present invention, a motor is provided, comprising: a rotor assembly; and a stator assembly such as any of the above technical solutions, wherein at least a portion of the stator assembly is located within the rotor assembly.

[0056] In the motor provided by the present invention, at least a portion of the stator assembly is located within the rotor assembly. Specifically, the stator assembly and the 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 permanent magnets of the rotor assembly and the windings of the stator assembly.

[0057] Furthermore, the motor provided by the present invention includes the stator assembly according to the first aspect of the present invention, and therefore has all the beneficial effects of the above-mentioned stator assembly, which will not be discussed in detail here.

[0058] In the above technical solution, further, a first air gap is provided between the auxiliary teeth and the rotor assembly; and a radial dimension of at least a portion of the first air gap gradually increases or decreases from the first end to the second end of the tooth shoe.

[0059] In this technical solution, the radial dimension of at least a portion of the first air gap is gradually increased or decreased from the first end of the tooth shoe to the second end of the tooth shoe. This not only creates a non-uniform air gap between the stator assembly and the rotor, thereby improving the waveform of the air gap magnetic field, reducing the cogging torque and torque ripple of the motor, and enhancing the motor's reliability, but also alters the air gap permeance distribution to reduce the number of air gap permeance periods. This increases the harmonic components of the modulated magnetic flux density, generates more operating harmonics, and further improves the motor's output torque.

[0060] It can be understood that the radial dimension of the air gap is the distance between the stator assembly and the rotor assembly in the radial direction of the stator assembly.

[0061] In any of the above technical solutions, further, the radial size of the portion of the first air gap located between the secondary spline surface and the rotor assembly gradually increases or decreases from the first end of the tooth shoe to the second end of the tooth shoe; and / or the radial size of the portion of the first air gap located between the primary spline surface and the rotor assembly remains unchanged from the first end of the tooth shoe to the second end of the tooth shoe.

[0062] In this technical solution, the spline surface at the auxiliary tooth end may include at least a secondary spline surface, and the radial dimension of the portion of the first air gap between the secondary spline surface and the rotor assembly gradually increases or decreases, thereby achieving a configuration in which the radial dimension of at least a portion of the first air gap is gradually increased or decreased. This achieves the goal of forming a non-uniform air gap between the stator assembly and the rotor to improve the waveform of the air gap magnetic field, reduce the cogging torque and torque ripple of the motor, and improve the reliability of the motor. Furthermore, the air gap permeance distribution can be altered to reduce the number of air gap permeance periods, thereby increasing the harmonic components of the modulated magnetic flux density, generating more operating harmonics, and further improving the motor's output torque.

[0063] Furthermore, the spline surface at the end of the auxiliary tooth may also include a main spline surface, and the radial dimension of the portion of the first air gap between the main spline surface and the rotor assembly from the first end of the tooth shoe to the second end of the tooth shoe remains constant. This allows the first air gap formed between the auxiliary teeth of the stator assembly and the rotor assembly to be non-uniform when the stator assembly is mated with the rotor assembly. This improves the waveform of the magnetic field in the first air gap, making the magnetic field formed by the permanent magnets in the first air gap more sinusoidal, thereby reducing the cogging torque and torque ripple of the motor.

[0064] Furthermore, the spline surface at the auxiliary tooth end may include a main spline surface and an auxiliary spline surface, thereby further improving the torque output by the motor and reducing the cogging torque and torque ripple of the motor.

[0065] In any of the above technical solutions, further, the first air gap includes: a first sub-air gap, located between the first auxiliary tooth and the rotor assembly; a second sub-air gap, located between the second auxiliary tooth and the rotor assembly; wherein the first sub-air gap and the second sub-air gap are asymmetrical about the tooth body bisector of the tooth body.

[0066] In this technical solution, at least two auxiliary teeth include a first auxiliary tooth and a second auxiliary tooth. That is, the first air gap includes a first sub-air gap and a second sub-air gap, wherein the first sub-air gap is located between the first auxiliary tooth and the rotor assembly, and the second sub-air gap is located between the second auxiliary tooth and the rotor assembly. Furthermore, the first sub-air gap and the second sub-air gap are asymmetric about the tooth body bisector of the tooth body. 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 density. At this time, at least two stator auxiliary teeth introduce more harmonic components into the air gap permeability, which significantly improves the performance of the motor.

[0067] In any of the above technical solutions, further, the rotor assembly includes: a rotor core; and permanent magnets, which are arranged on the rotor core and form a plurality of permanent magnetic poles.

[0068] In this technical solution, the rotor structure further includes a rotor core and permanent magnets, wherein the permanent magnets are arranged on the rotor core and form a plurality of permanent magnetic poles.

[0069] Specifically, when at least a portion of the rotor structure is located inside the stator assembly, the permanent magnets may be placed on the outer surface of the rotor core, or placed inside the rotor core, such as in a V-shape or spoke shape.

[0070] Specifically, when at least a portion of the stator assembly is located within the rotor structure, the permanent magnets are retained on the inner surface of the rotor core. The permanent magnet poles can be composed of a plurality of permanent magnets having two lateral edges and generally arc-shaped inner and outer surfaces, or can be an integrally formed magnetic ring. Alternatively, the permanent magnet material can be ferrite, plastic magnet, rare earth permanent magnet, or rubber magnetic strip.

[0071] Furthermore, the permanent magnet includes a plurality of arc-shaped permanent magnets, the plurality of arc-shaped permanent magnets are distributed in a circular ring shape, and the polarities of two adjacent arc-shaped permanent magnets are different.

[0072] Specifically, the permanent magnet includes a plurality of arc-shaped permanent magnets. The plurality of arc-shaped permanent magnets are distributed in a circular ring shape, and the polarities of two adjacent arc-shaped permanent magnets are different. Specifically, each arc-shaped permanent magnet has 1, 2, or 4 magnetic poles, and the polarities of adjacent magnetic poles are alternately different.

[0073] Furthermore, the permanent magnet comprises an integrated annular permanent magnet. In this case, when the annular permanent magnet has multiple magnetic poles, the number of permanent magnets can be reduced, the permanent magnet installation process time can be shortened, and manufacturing and assembly efficiency can be improved. Furthermore, when the magnetic pole width is small, using a single annular permanent magnet to fill multiple poles can increase the width of the annular permanent magnet, reducing the difficulty of processing the annular permanent magnet.

[0074] 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.

[0075] 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.

[0076] 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

[0077] 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:

[0078] Figure 1 A schematic structural diagram of a stator assembly provided by one embodiment of the present invention is shown;

[0079] Figure 2 Shown Figure 1 A partial enlarged view of point A in the middle;

[0080] Figure 3 shows a structural schematic diagram of a stator assembly provided by another embodiment of the present invention;

[0081] Figure 4FIG2 shows a structural schematic diagram of a stator assembly provided by another embodiment of the present invention;

[0082] Figure 5 FIG2 shows a structural schematic diagram of a stator assembly provided by another embodiment of the present invention;

[0083] Figure 6 A schematic structural diagram of a motor provided by an embodiment of the present invention is shown;

[0084] Figure 7 Shown Figure 6 Schematic diagram of the structure of the rotor assembly in the motor.

[0085] in, Figures 1 to 7 The corresponding relationship between the reference numerals and components in FIG. 1 is as follows:

[0086] 100 stator assembly, 102 stator yoke, 104 tooth body, 106 tooth shoe, 108 stator main tooth, 110 auxiliary tooth, 112 spline plane, 114 first spline surface, 116 spline surface, 118 auxiliary spline surface, 120 first spline surface, 122 second spline surface, 124 first auxiliary tooth, 126 second auxiliary tooth, 128 notch, 130 groove, 134 first air gap, 136 first sub-air gap, 138 second sub-air gap, 140 winding slot, 200 motor, 202 rotor assembly, 204 rotor core, 206 permanent magnet, 208 main spline surface. DETAILED DESCRIPTION

[0087] 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.

[0088] 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.

[0089] Refer to the following Figures 1 to 7 The stator assembly and the motor provided according to some embodiments of the present invention are described.

[0090] The present invention proposes a stator assembly 100 in a first aspect, such as Figure 1As shown, a stator yoke 102; a stator main tooth 108, the stator main tooth 108 includes a tooth body 104 and a tooth shoe 106, one end of the tooth body 104 is connected to the stator yoke 102, and the tooth shoe 106 is connected to the other end of the tooth body 104, at least two auxiliary teeth 110 are provided at the end of the tooth shoe 106 away from the tooth body 104, and a spline surface 116 is provided at the end of each auxiliary tooth 110; wherein, from the first end to the second end of the tooth shoe 106, the distance between at least a portion of the spline surface 116 and the center of the stator yoke 102 gradually increases or decreases.

[0091] The stator assembly 100 proposed in the present invention includes a stator yoke 102 and stator main teeth 108 arranged on the stator yoke 102, wherein the stator main teeth 108 include a tooth body 104 and a tooth shoe 106, one end of the tooth body 104 is connected to the stator yoke 102, and the tooth shoe 106 is connected to the other end of the tooth body 104, thereby realizing the connection between the stator main teeth 108 and the stator yoke 102, and then a winding can be set on the stator main teeth 108 to achieve coordination with the magnetic field of the permanent magnet 206 of the rotor assembly 202 when power is applied, thereby realizing the rotation of the motor rotor.

[0092] Furthermore, at least two auxiliary teeth 110 are provided at the end of the tooth shoe 106 away from the tooth body 104. With these two auxiliary teeth 110, the at least two auxiliary teeth 110 can function as magnetic conductive components to conduct magnetic flux and also as modulation components to modulate the magnetic field. This introduces more harmonic components into the air gap flux, significantly improving motor performance.

[0093] Furthermore, the distance between at least a portion of the spline surface 116 and the center of the stator yoke 102 gradually increases or decreases from the first end of the tooth shoe 106 to the second end of the tooth shoe 106. This changes the air gap permeance distribution, 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, which means that more operating harmonics are generated, further improving the motor output torque.

[0094] The stator assembly 100 provided by the present invention comprises at least two auxiliary teeth 110 disposed on the tooth shoe 106 of the stator main teeth 108. Furthermore, the distance between at least a portion of the spline surface 116 and the center of the stator yoke 102 gradually increases or decreases from the first end to the second end of the tooth shoe 106. This not only achieves the formation of a non-uniform air gap between the stator assembly 100 and the rotor, thereby improving the waveform of the air gap magnetic field, reducing the cogging torque and torque ripple of the motor, and enhancing the reliability of the motor, but also modifies the air gap permeance distribution, reducing the number of air gap permeance periods, thereby increasing the harmonic components of the modulated magnetic flux density, generating more operating harmonics, and further improving the motor's output torque.

[0095] In the above embodiment, further, Figure 2 As shown, the spline surface 116 includes: a main spline surface 208, which is provided at one end of the tooth body 104; and a secondary spline surface 118, which is connected to the main spline surface 208. From the first end of the tooth shoe 106 to the second end of the tooth shoe 106, the distance between the secondary spline surface 118 and the center of the stator yoke 102 gradually increases or decreases.

[0096] In this embodiment, the spline surface 116 may include a primary spline surface 208 and a secondary spline surface 118. The primary spline surface 208 is disposed at one end of the tooth body 104, and the secondary spline surface 118 is connected to the primary spline surface 208. Furthermore, the distance between the secondary spline surface 118 and the center of the stator yoke 102 gradually increases or decreases from the first end of the tooth shoe 106 to the second end of the tooth shoe 106. This achieves a gradual increase or decrease in the distance between at least a portion of the spline surface 116 at the end of the secondary tooth 110 and the center of the stator yoke 102, thereby changing the air gap permeance distribution and 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 will increase, which will generate more operating harmonics and further improve the motor output torque.

[0097] Furthermore, the distance between the main spline surface 208 and the center of the stator yoke 102 remains constant from the first end of the tooth shoe 106 to the second end of the tooth shoe 106 .

[0098] Specifically, by setting the main spline surface 208 to maintain a constant distance from the center of the stator yoke 102, thereby cooperating with the setting of the secondary spline surface 118, when the stator assembly 100 is connected to the rotor assembly 202, a non-uniform air gap can be formed between the secondary teeth 110 of the stator assembly 100 and the rotor assembly 202, thereby improving the waveform of the air gap magnetic field, making the magnetic field formed by the permanent magnet 206 in the air gap closer to a sinusoidal shape, and reducing the cogging torque and torque ripple of the motor.

[0099] In any of the above embodiments, further, the secondary spline surface 118 includes at least the spline plane 112 ; and / or the secondary spline surface 118 includes at least the first spline curved surface 114 ; and / or the primary spline surface 208 includes a second spline curved surface.

[0100] In this embodiment, the secondary spline surface 118 may include a spline plane 112, that is, the spline surface 116 at the end of the secondary tooth 110 includes at least a section of the spline plane 112. By setting the secondary spline surface 118 as the spline plane 112, it is ensured that the distance between the secondary spline surface 118 and the center of the stator yoke 102 can gradually increase or decrease from the first end of the tooth shoe 106 to the second end of the tooth shoe 106. This changes the air gap permeability distribution, reducing the number of air gap permeability periods. When the number of air gap permeability periods decreases, the harmonic components of the modulated magnetic flux density will increase, that is, more operating harmonics will be generated, and the motor output torque will be further improved. In combination with the configuration of the main spline surface 208, when the stator assembly is connected to the rotor assembly, an uneven air gap can be formed between the secondary teeth of the stator assembly and the rotor assembly, thereby improving the waveform of the air gap magnetic field, making the magnetic field formed by the permanent magnets in the air gap closer to a sinusoidal shape, and reducing the cogging torque and torque ripple of the motor.

[0101] Furthermore, the secondary spline surface 118 may also include a first spline surface 114. That is, the spline surface 116 at the end of the secondary tooth 110 includes at least a section of the first spline surface 114. By adjusting the extension direction of the first spline surface 114, the distance between the secondary spline surface 118 and the center of the stator yoke 102 can also be gradually increased or decreased, thereby achieving the effect of improving the motor's output torque. Furthermore, in conjunction with the configuration of the primary spline surface 208, the motor's cogging torque and torque ripple can be reduced.

[0102] Furthermore, the main spline surface 208 may include a second spline surface. Specifically, when viewed along the axial direction of the stator assembly, the extension direction of the second spline surface may be located on a concentric circle with the stator yoke 102, thereby ensuring that the distance between the second spline surface and the center of the stator yoke 102 remains constant, that is, the distance between the main spline surface 208 and the center of the stator yoke 102 remains constant. Furthermore, in conjunction with the provision of the secondary spline surface 118, when the stator assembly 100 is mated with the rotor assembly 202, a non-uniform air gap is formed between the secondary teeth 110 of the stator assembly 100 and the rotor assembly 202. This improves the waveform of the air gap magnetic field, making the magnetic field formed by the permanent magnets in the air gap more sinusoidal, thereby reducing the cogging torque and torque ripple of the motor.

[0103] Furthermore, the primary spline surface 208 includes a second spline surface, and the secondary spline surface 118 includes both a spline plane 112 and a first spline surface 114. The second spline surface is provided at one end of the tooth body 104, the first spline surface 114 is connected to the second spline surface, and the spline plane 112 is connected to the first spline surface 114. Alternatively, the spline plane 112 is connected to the second spline surface, and the first spline surface 114 is connected to the spline plane 112.

[0104] In any of the above embodiments, further, the auxiliary tooth 110 includes a first auxiliary tooth 124 and a second auxiliary tooth 126; the spline surface 116 includes a first spline surface 120 and a second spline surface 122, the first spline surface 120 is located on the first auxiliary tooth 124, and the second spline surface 122 is located on the second auxiliary tooth 126; wherein the first spline surface 120 and the second spline surface 122 are asymmetric about the tooth body bisector of the tooth body 104.

[0105] In this embodiment, the at least two auxiliary teeth 110 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 notch 128 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.

[0106] Furthermore, the spline surface 116 includes a first spline surface 120 and a second spline surface 122, wherein the first spline surface 120 is located on the first auxiliary tooth 124, and the second spline surface 122 is located on the second auxiliary tooth 126, and the first spline surface 120 and the second spline surface 122 are asymmetric about the bisector of the tooth body 104 of the stator main tooth 108. Such an arrangement can change the air gap permeance 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 permeance containing harmonics interact, new harmonic components will appear in the air gap magnetic flux. At this time, at least two stator auxiliary teeth 110 introduce more harmonic components into the air gap permeance, which significantly improves the performance of the motor.

[0107] In any of the above embodiments, further, Figure 1 、 Figure 2 and Figure 3 As shown, there are multiple stator main teeth 108 , which are distributed along the circumference of the stator yoke 102 ; a winding slot 140 is provided between two adjacent tooth bodies 104 , and a notch 128 is provided between two adjacent tooth shoes 106 , and the notch 128 is connected to the winding slot 140 .

[0108] In this embodiment, the number of stator main teeth 108 can be set to multiple, and the multiple stator main teeth 108 are distributed along the circumference of the stator yoke 102, so as to ensure the number of windings wound on the stator main teeth 108 in the stator assembly 100, and further ensure that the magnetic field generated by the permanent magnet during the operation of the motor can effectively cooperate with the winding, thereby ensuring the operating efficiency of the motor.

[0109] Specifically, there is a winding groove 140 between the tooth bodies 104 of two adjacent stator main teeth 108, so that when the winding is wound on the tooth body 104 of the stator main tooth 108, it can be accommodated in the winding groove 140, ensuring the rationality of the placement of the winding groove 140, thereby ensuring the number of windings and further ensuring the operating efficiency of the motor.

[0110] Furthermore, a notch 128 is provided between two adjacent tooth boots 106, and the notch 128 is connected to the winding slot 140. By setting the notch 128, the starting torque of the motor can be reduced, the air gap magnetic field waveform can be improved, and additional losses can be reduced. It is also beneficial to adjust the air gap magnetic field harmonic amplitude and the rotor eddy current density, thereby ensuring the stability of the motor during 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 width of the notch 128 to meet the different operating requirements of the motor.

[0111] Furthermore, a groove 130 is provided between two adjacent auxiliary teeth 110 on the same stator main tooth 108 ; in the circumferential direction of the stator assembly 100 , the size of the groove 130 is not equal to the size of the notch 128 .

[0112] Specifically, on the same stator main tooth 108, a groove 130 is provided between two adjacent auxiliary teeth 110, thereby separating the two adjacent auxiliary teeth 110 and ensuring the unevenness of the air gap between the stator main tooth 108 and the rotor assembly 202, thereby improving the waveform of the air gap magnetic field and 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 and ensuring the stability of the motor during operation.

[0113] Furthermore, in the circumferential direction of the stator assembly 100, the size of the groove 130 between two adjacent auxiliary teeth 110 and the size of the notch 128 between the tooth shoes 106 of two adjacent stator main teeth 108 can be set to be unequal. Specifically, in the circumferential direction of the stator assembly 100, the width of the groove 130 can be set to be unequal to the width of the notch 128.

[0114] By setting the sizes of the grooves 130 and the slots 128 to be unequal, the uniformity of the circumferential distribution of the auxiliary teeth 110 on all the stator main teeth 108 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.

[0115] Specifically, in the circumferential direction of the stator assembly 100, the size of the groove 130 is larger than the size of the notch 128. Specifically, in the circumferential direction of the stator assembly 100, the size of the groove 130 between two adjacent auxiliary teeth 110 is d1, and the size of the notch 128 is d2, and d1>d2 is satisfied.

[0116] In this way, the uniformity of the distribution of the auxiliary teeth 110 on the circumference will be changed, that is, the number of periods of the air gap magnetic permeance will be reduced, and the pole pair number of each working harmonic of the air gap magnetic density is: |Pr±i×Zf| (i=0,1,2……), Zf is the number of periods of the air gap magnetic permeance; when the number of periods of the air gap magnetic permeance decreases, the harmonic component of the magnetic density generated by modulation will increase, that is, more working harmonics will be generated, so that the output torque of the motor will be further improved.

[0117] By setting the sizes of the grooves 130 and the slots 128 to be unequal, the uniformity of the circumferential distribution of the auxiliary teeth 110 on all the stator main teeth 108 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.

[0118] In any of the above embodiments, further, Figure 1 As shown, in two adjacent stator main teeth 108 , a slot 128 is provided between the auxiliary tooth 110 of one stator main tooth 108 and the auxiliary tooth 110 of the other stator main tooth 108 ; at the slot 128 , the distances from the bisector of the angle between the two adjacent stator main teeth 108 to the two adjacent auxiliary teeth 110 are equal or unequal.

[0119] In this embodiment, the auxiliary teeth 110 on the tooth shoes 106 of the stator main teeth 108 not only serve as magnetic conductors but also as modulation components, achieving magnetic field modulation. Specifically, the distances from the angle bisectors of two adjacent stator main teeth 108 to the first auxiliary tooth 124 and the second auxiliary tooth 126 can be set to be equal, thereby ensuring uniform distribution of the air gap magnetic field and promoting stable motor operation.

[0120] Furthermore, on the basis of ensuring the stability of the motor operation, the distances from the angular bisector of two adjacent stator main teeth 108 to the first auxiliary tooth 124 and the second auxiliary tooth 126 can also be set to be unequal. That is, the tooth shoe 106 or the slot 128 is offset to one side of the two adjacent stator main teeth 108, which can change the distribution of the air gap magnetic field and weaken some harmonics in the air gap magnetic field, thereby reducing the torque pulsation during the operation of the motor and improving the vibration and noise performance of the motor.

[0121] Furthermore, the distances from the tooth bisector of the stator main tooth 108 to the two side walls of the groove 130 are equal. Thus, in the circumferential direction of the stator assembly 100, the groove 130 is located in the middle of the tooth shoe 106. This design simplifies the overall structure of the stator main tooth 108 and facilitates its processing and manufacturing, 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 tooth bisector of the stator main tooth 108 to the two side walls of the groove 130 are d3 and d4, respectively, and d3 equals d4.

[0122] Furthermore, the distances from the tooth body bisector of the stator main tooth 108 to the two side walls of the groove 130 may also be unequal. In this way, in the circumferential direction of the stator assembly 100, the groove 130 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 110 introduce more harmonic components into the air gap permeability, which significantly improves the performance of the motor.

[0123] In any of the above embodiments, further, the stator assembly 100 includes at least two stacks, any stack includes a yoke segment and stator main teeth 108, the stator main teeth 108 are arranged on the yoke segment, the yoke segments of two adjacent stacks are connected, and the stator yoke 102 includes multiple yoke segments.

[0124] In this embodiment, the stator assembly 100 includes at least two stacks, which are stacked together to form the stator assembly 100. This allows workers to perform winding and other operations on a single stack during the manufacturing process. Compared to related art methods that require winding on a single core, the stacks proposed in this invention offer greater flexibility, reducing winding complexity, improving winding efficiency, and reducing material costs.

[0125] Furthermore, the present invention allows winding and other operations to be performed initially on a single stack, effectively increasing the number of windings and the slot fill rate of the windings, thereby improving the output performance of the motor incorporating the stator assembly 100. 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 the 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 the stator assembly 100.

[0126] Furthermore, the yoke sections of two adjacent stacked bodies are detachably connected; the stator assembly 100 further includes a fixing member, and the two adjacent stacked bodies are fixed by the fixing member.

[0127] Specifically, the yoke sections of two adjacent stacked bodies are detachably connected, thereby ensuring the assembly and disassembly of the two adjacent stacked bodies.

[0128] Specifically, the stator assembly 100 may include a first connecting portion and a second connecting portion. The first connecting portion is disposed at the first end of the yoke segment, and the second connecting portion is disposed at the second end of the yoke segment, with the first end and the second segment being disposed relative to each other on the yoke segment. 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. Therefore, during the process of splicing stacked bodies, the present invention can connect two adjacent stacked bodies via the first connecting portion and the second connecting portion, including a detachable connection between two adjacent stacked bodies.

[0129] Furthermore, 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 are detachably connected and have a self-locking function. Specifically, the concave portion includes, but is not limited to, a polygonal groove, a circular groove, or an elliptical groove; the shape of the convex portion matches the shape of the concave portion.

[0130] Furthermore, the stator assembly 100 further includes a fixing member, and two adjacent stacked bodies are fixed by the fixing member.

[0131] Specifically, after two adjacent stacks are joined, the overall structure is further secured using fixings, thereby further improving the structural stability of the joined stack. Specifically, the fixings can be insulating frames, which not only ensure insulation but also secure the stacks, thus achieving a multi-purpose insulating frame.

[0132] Specifically, two adjacent stacked bodies are connected by welding. After the two adjacent stacked bodies are spliced ​​together, the present invention further fixes the overall structure by welding, thereby further improving the structural stability of the spliced ​​stacked bodies.

[0133] Specifically, two adjacent stacked bodies are integrally injection molded. That is, after the two adjacent stacked bodies are spliced ​​together, the present invention further fixes the overall structure by integral injection molding, thereby further improving the structural stability of the spliced ​​stacked bodies.

[0134] In any of the above embodiments, further, Figure 1As shown, in two adjacent auxiliary teeth 110, an angle β is formed between the tooth body bisector of one auxiliary tooth 110 and the tooth body bisector of the other auxiliary tooth 110, and satisfies 1≤β / (2π / (a×x))<1.4, where a represents the number of stator main teeth 108, and x represents the number of auxiliary teeth 110 on each stator main tooth 108.

[0135] In this embodiment, between two adjacent auxiliary teeth 110, the tooth body bisector of one auxiliary tooth 110 and the tooth body bisector of the other auxiliary tooth 110 form an angle β that satisfies 1≤β / (2π / (ax))<1.4, where a represents the number of stator main teeth 108, and x represents the number of auxiliary teeth 110 on each stator main tooth 108. Thus, the present invention further optimizes the structure and distribution of the auxiliary teeth 110, resulting in larger harmonic amplitudes and higher torque generated by motor modulation, further improving motor efficiency.

[0136] Specifically, the auxiliary teeth 110 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 110, and the number of stator main teeth 108 is six. Accordingly, the angle β between the tooth body bisector of the first auxiliary tooth 124 and the tooth body bisector 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 a larger harmonic amplitude and higher torque, further improving the motor's operating efficiency.

[0137] 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 102 .

[0138] In this embodiment, the tooth body 104 of the stator main tooth 108 and the tooth shoe 106 can be detachably connected. Simultaneously, the tooth body 104 of the stator main tooth 108 and the stator yoke 102 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 108, the stator yoke 102, 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 102, during the assembly of the stator assembly 100, a coil can be first wound around the tooth body 104 of the stator main tooth 108, then one end of the tooth body 104 can be connected to the stator yoke 102, 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, improves the motor output performance from the perspective of stator preparation, and reduces scrap and material waste.

[0139] Specifically, the tooth body 104 of the stator main tooth 108 and the stator yoke 102 can be connected through a concave-convex structure, that is, a groove 130 or a protrusion is provided at one end of the tooth body 104 of the stator main tooth 108, and correspondingly, a protrusion or groove 130 that matches the groove 130 or the protrusion is provided at a corresponding position of the stator yoke 102, so that the connection between the tooth body 104 of the stator main tooth 108 and the stator yoke 102 can be achieved through the cooperation of the groove 130 and the protrusion.

[0140] 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 130 to simplify the winding process.

[0141] Furthermore, the stator assembly 100 further includes a winding, which includes a plurality of coils, and each coil is disposed on a stator main tooth 108 .

[0142] Specifically, the stator assembly 100 further includes a winding, which includes a plurality of coils. Specifically, the coils are wound around the stator main teeth 108 to ensure that the motor using the stator assembly 100 outputs torque when in operation.

[0143] Furthermore, each coil is wound around only one stator main tooth 108, i.e., a single-tooth concentrated winding structure is adopted. In this case, the motor winding end is smaller, which is beneficial to reducing copper loss, facilitating modularization, and improving production efficiency.

[0144] According to the second aspect of the present invention, Figure 6 and Figure 7 As shown, an electric machine 200 is proposed, comprising: a rotor assembly 202 ; and a stator assembly 100 as in any of the above embodiments, wherein at least a portion of the stator assembly 100 is located in the rotor assembly 202 .

[0145] In the motor 200 provided by the present invention, at least a portion of the stator assembly 100 is located within the rotor assembly 202. Specifically, the stator assembly 100 and the rotor assembly 202 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 200. 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 modes between the permanent magnets of the rotor assembly 202 and the windings of the stator assembly 100.

[0146] Furthermore, the motor 200 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 obtained, which will not be discussed in detail here.

[0147] In any of the above embodiments, further, a first air gap 134 is defined between the auxiliary tooth 110 and the rotor assembly 202 ; and a radial dimension of at least a portion of the first air gap 134 gradually increases or decreases from the first end of the tooth shoe 106 to the second end of the tooth shoe 106 .

[0148] In this embodiment, the radial dimension of at least a portion of the first air gap 134 is configured to gradually increase or decrease from the first end of the tooth shoe 106 to the second end of the tooth shoe 106. This not only allows for a non-uniform air gap to be formed between the stator assembly and the rotor, thereby improving the waveform of the air gap magnetic field, reducing the cogging torque and torque ripple of the motor, and enhancing the reliability of the motor, but also allows for the air gap permeance distribution to be altered, thereby reducing the number of air gap permeance periods. This increases the harmonic components of the magnetic flux density generated by modulation, generates more operating harmonics, and further enhances the motor's output torque.

[0149] It can be understood that the radial dimension of the first air gap 134 is the distance of the gap between the stator assembly 100 and the rotor assembly 202 in the radial direction of the stator assembly 100 .

[0150] In any of the above embodiments, further, the radial size of the portion of the first air gap 134 located between the secondary spline surface 118 and the rotor assembly gradually increases or decreases from the first end of the tooth shoe 106 to the second end of the tooth shoe 106; and / or the radial size of the portion of the first air gap 134 located between the primary spline surface 208 and the rotor assembly remains unchanged from the first end of the tooth shoe 106 to the second end of the tooth shoe 106.

[0151] In this embodiment, the spline surface 116 at the end of the auxiliary tooth 110 may include at least an auxiliary spline surface 118, and the radial dimension of the portion of the first air gap 134 between the auxiliary spline surface 118 and the rotor assembly gradually increases or decreases, thereby achieving a configuration in which the radial dimension of at least a portion of the first air gap 134 is gradually increased or decreased. While achieving a non-uniform air gap between the stator assembly 100 and the rotor assembly 202 to improve the waveform of the air gap magnetic field, reduce the cogging torque and torque ripple of the motor 200, and enhance the reliability of the motor 200, the air gap permeance distribution can also be altered to reduce the number of air gap permeance periods, thereby increasing the harmonic components of the modulated magnetic flux density, generating more operating harmonics, and further increasing the torque output by the motor 200.

[0152] Furthermore, the spline surface 116 at the end of the auxiliary tooth 110 may also include a main spline surface 208, and the radial dimension of the portion of the first air gap 134 between the main spline surface 208 and the rotor assembly 202 remains constant from the first end of the tooth shoe 106 to the second end of the tooth shoe 106. This results in a non-uniform first air gap 134 formed between the auxiliary teeth 110 of the stator assembly 100 and the rotor assembly 202 when the stator assembly 100 is mated and connected to the rotor assembly 202. This improves the waveform of the magnetic field in the first air gap 134, making the magnetic field formed by the permanent magnets in the first air gap 134 more sinusoidal, thereby reducing the cogging torque and torque ripple of the motor 200.

[0153] Furthermore, the spline surface 116 at the end of the auxiliary tooth 110 may include both a main spline surface 208 and an auxiliary spline surface 118 , thereby further improving the torque output by the motor 200 and reducing the cogging torque and torque ripple of the motor 200 .

[0154] In any of the above embodiments, further, the first air gap 134 includes: a first sub-air gap 136, located between the first auxiliary tooth 124 and the rotor assembly 200; a second sub-air gap 138, located between the second auxiliary tooth 126 and the rotor assembly 202; wherein the first sub-air gap 136 and the second sub-air gap 138 are asymmetric about the tooth body bisector of the tooth body 104.

[0155] In this embodiment, the at least two auxiliary teeth 110 include a first auxiliary tooth 124 and a second auxiliary tooth 126. That is, the first air gap 134 includes a first sub-air gap 136 and a second sub-air gap 138, wherein the first sub-air gap 136 is located between the first auxiliary tooth 124 and the rotor assembly, and the second sub-air gap 138 is located between the second auxiliary tooth 126 and the rotor assembly. Furthermore, the first sub-air gap 136 and the second sub-air gap 138 are asymmetrical about the tooth body bisector of the tooth body 104. This arrangement can change the air gap permeance distribution, weaken some harmonics, thereby reducing torque ripple and improving the vibration and noise performance of the motor 200. Furthermore, when the permanent magnet magnetomotive force interacts with the air gap permeance containing harmonics, new harmonic components appear in the air gap flux density. In this case, the at least two stator auxiliary teeth 110 introduce more harmonic components into the air gap permeance, significantly improving the performance of the motor 200.

[0156] In any of the above embodiments, further, the rotor assembly 202 includes: a rotor core 204; and permanent magnets 206 disposed on the rotor core 204, wherein the permanent magnets 206 form a plurality of permanent magnetic poles.

[0157] In this embodiment, the rotor structure further includes a rotor core 204 and permanent magnets 206. The permanent magnets 206 are disposed on the rotor core 204, and a plurality of permanent magnetic poles are formed by the permanent magnets 206.

[0158] Furthermore, the pole-pair number Ps of the stator winding satisfies: Ps = |ax ± Pr|. Here, a represents the number of stator main teeth 108, x represents the number of auxiliary teeth 110 on each stator main tooth 108, and Pr represents the pole-pair number of the plurality of permanent magnets 206. The new harmonic components appearing in the air-gap flux density serve as operating harmonics for the motor 200, providing output torque for the motor 200 and effectively improving the torque density of the motor 200.

[0159] Specifically, when at least a portion of the rotor structure is located inside the stator assembly 100 , the permanent magnets 206 may be placed on the outer surface of the rotor core 204 , or placed inside the rotor core 204 , such as in a V-shaped or spoke-shaped magnet arrangement.

[0160] Specifically, when at least a portion of the stator assembly 100 is located within the rotor structure, the permanent magnets 206 are retained on the inner surface of the rotor core 204. The permanent magnet poles can be composed of a plurality of permanent magnets 206 having two lateral edges and substantially arc-shaped inner and outer surfaces, or can be an integrally formed magnetic ring. Alternatively, the permanent magnets 206 can be made of ferrite, plastic magnets, rare earth permanent magnets, or rubber magnetic strips.

[0161] Furthermore, the permanent magnet 206 includes a plurality of arc-shaped permanent magnets, which are distributed in a circular ring shape, and the polarities of two adjacent arc-shaped permanent magnets are different.

[0162] Furthermore, if Figure 7 As shown, there can be a plurality of permanent magnets 206, distributed on the rotor core 204, and arranged with opposite polarities. Furthermore, an angle γ is formed between the line connecting the center of the stator yoke 102 and the two ends of the permanent magnet 206. The existence of this angle can further change the air gap 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 200 using the sub-rotor assembly 202. This also avoids the problem of reduced torque caused by the reduction in the number of magnetic poles and the decrease in the amplitude of the magnetic field fundamental wave after the use of alternating poles in traditional permanent magnet motors 200.

[0163] Furthermore, 0.9<γ / (π / (Pr))<1.7 is satisfied, wherein Pr is the number of permanent magnets 206 . When the angle γ satisfies the above condition, the working performance of the rotor assembly 202 is good.

[0164] Specifically, the permanent magnet 206 includes a plurality of arc-shaped permanent magnets. The plurality of arc-shaped permanent magnets are arranged in a circular ring shape, and the polarities of two adjacent arc-shaped permanent magnets are different. Specifically, each arc-shaped permanent magnet has 1, 2, or 4 magnetic poles, and the polarities of adjacent magnetic poles are alternately different.

[0165] Furthermore, permanent magnet 206 comprises an integrated annular permanent magnet. In this case, when the annular permanent magnet has multiple magnetic poles, the number of permanent magnets 206 can be reduced, the installation process time of permanent magnet 206 can be shortened, and manufacturing and assembly efficiency can be improved. Furthermore, when the magnetic pole width is small, using a single annular permanent magnet with multiple poles can increase the width of the annular permanent magnet, reducing the difficulty of processing the annular permanent magnet.

[0166] Specifically, the permanent magnets 206 may be arranged in a Halbach array.

[0167] Furthermore, the rotor assembly may include a plurality of salient poles, which protrude from the inner circumferential wall of the rotor core 204 and are spaced apart in the circumferential direction of the rotor core 204. A plurality of permanent magnets 206 are disposed between two adjacent salient poles, and the plurality of permanent magnets 206 have the same polarity. Thus, the plurality of salient poles and the plurality of permanent magnets 206 are alternately distributed in the circumferential direction of the rotor core 204.

[0168] By placing multiple permanent magnets 206 of the same polarity between two adjacent salient poles, a magnetic structure with alternating poles is created on the rotor core 204 of the rotor core, making the rotor core a salient pole structure. This not only reduces the number of permanent magnets 206 used and reduces the difficulty of manufacturing the alternating-stage rotor, but also enhances the magnetic field modulation effect and increases the amplitude of the working sub-magnetic harmonics, resulting in better output performance of the motor. Furthermore, the alternating distribution of multiple salient poles and multiple permanent magnets 206 on the rotor core 204 of the present invention also avoids the problem of reduced number of magnetic poles and decreased amplitude of the fundamental magnetic field after the use of alternating poles in related technologies, which leads to decreased torque.

[0169] 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.

[0170] The electrical device provided by the present invention includes the motor 200 of any of the above-described embodiments, wherein a non-uniform air gap can be formed between the stator assembly 100 and the rotor assembly 202 of the motor 200, thereby improving the waveform of the air gap magnetic field, reducing the cogging torque and torque ripple of the motor 200, and improving the reliability of the motor 200. Furthermore, the uniformity of the magnetic field distribution during operation of the motor 200 is ensured, thereby ensuring the stability of the motor 200 during operation. This further ensures the stability of the electrical device during operation.

[0171] Specifically, the electrical appliance may include an air conditioner, a washing machine, or a vacuum cleaner.

[0172] 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.

[0173] 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.

[0174] 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 stator assembly, characterized in that: include: stator yoke; The stator main tooth comprises 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. At least two auxiliary teeth are provided at the end of the tooth shoe away from the tooth body, and a spline surface is provided at the end of any of the auxiliary teeth; wherein, from the first end of the tooth shoe to the second end of the tooth shoe, the distance from at least a portion of the spline surface to the center of the stator yoke gradually increases or decreases; The spline surface includes a main spline surface and a sub-spline surface, wherein the main spline surface is provided at one end of the tooth body, the sub-spline surface is connected to the main spline surface, and the distance between the sub-spline surface and the center of the stator yoke gradually increases or decreases from the first end of the tooth shoe to the second end of the tooth shoe; In two adjacent auxiliary teeth, an angle β is formed between the tooth body bisector of one auxiliary tooth and the tooth body bisector of the other auxiliary tooth, and satisfies 1≤β / (2π / (a×x))<1.4, where a represents the number of the stator main teeth, and x represents the number of auxiliary teeth on each stator main tooth.

2. The stator assembly according to claim 1, characterized in that A distance from the main spline surface to the center of the stator yoke remains constant from the first end of the tooth shoe to the second end of the tooth shoe.

3. The stator assembly according to claim 1, characterized in that The sub-spline surface at least includes a spline plane; and / or The sub-spline surface includes at least a first spline surface; and / or The main spline surface includes a second spline surface.

4. The stator assembly according to any one of claims 1 to 3, characterized in that: The at least two auxiliary teeth include a first auxiliary tooth and a second auxiliary tooth; The spline surface includes a first spline surface and a second spline surface, the first spline surface is located on the first auxiliary tooth, and the second spline surface is located on the second auxiliary tooth; The first spline surface and the second spline surface are asymmetric with respect to a tooth body bisector of the tooth body.

5. The stator assembly according to any one of claims 1 to 3, characterized in that: There are multiple stator main teeth, and the multiple stator main teeth are distributed along the circumference of the stator yoke; A winding groove is provided between two adjacent tooth bodies, and a notch is provided between two adjacent tooth shoes, and the notch is communicated with the winding groove.

6. The stator assembly according to claim 5, characterized in that A groove is provided between two adjacent auxiliary teeth on the same stator main tooth; In the circumferential direction of the stator assembly, the size of the groove is different from the size of the notch.

7. The stator assembly according to claim 6, characterized in that In two adjacent stator main teeth, a notch is provided between the auxiliary tooth of one stator main tooth and the auxiliary tooth of the other stator main tooth; At the slot, the distances from the angle bisectors of two adjacent stator main teeth to two adjacent auxiliary teeth are equal or unequal.

8. The stator assembly according to any one of claims 1 to 3, characterized in that: The stator assembly includes at least two stacked bodies, any of the stacked bodies includes a yoke segment and the stator main teeth, the stator main teeth are arranged on the yoke segment, the yoke segments of two adjacent stacked bodies are connected, and the stator yoke includes multiple yoke segments.

9. The stator assembly according to claim 8, characterized in that The yoke sections of two adjacent stacked bodies are detachably connected; The stator assembly further includes a fixing member, and two adjacent stacked bodies are fixed by the fixing member.

10. The stator assembly according to any one of claims 1 to 3, 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.

11. The stator assembly according to any one of claims 1 to 3, characterized in that: Also includes: The winding includes a plurality of coils, each of which is wound around one of the stator main teeth.

12. A motor, characterized in that: include: rotor assembly; The stator assembly according to any one of claims 1 to 9, wherein at least a portion of the stator assembly is located within the rotor assembly.

13. The motor according to claim 12, characterized in that A first air gap is defined between the auxiliary teeth and the rotor assembly; A radial dimension of at least a portion of the first air gap gradually increases or decreases from a first end of the tooth shoe to a second end of the tooth shoe.

14. The motor according to claim 13, characterized in that From the first end of the tooth shoe to the second end of the tooth shoe, the radial size of the portion of the first air gap located between the secondary spline surface and the rotor assembly gradually increases or decreases; and / or A radial dimension of a portion of the first air gap located between the main spline surface and the rotor assembly is constant from a first end of the tooth shoe to a second end of the tooth shoe.

15. The motor according to claim 14, characterized in that The first air gap comprises: a first sub-air gap, located between the first auxiliary tooth and the rotor assembly; a second sub-air gap, located between the second auxiliary tooth and the rotor assembly; The first sub-air gap and the second sub-air gap are asymmetrical with respect to a tooth body bisector of the tooth body.

16. The electric machine according to any one of claims 13 to 15, characterized in that The rotor assembly comprises: rotor core; A permanent magnet is arranged on the rotor core, and the permanent magnet forms a plurality of magnetic poles.

17. An electrical device, characterized in that: include: A motor as claimed in any one of claims 12 to 16.

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