Stator core, stator, motor and fan

Abstract

The present invention provides a stator core, a stator, a motor, and a fan, wherein the stator teeth include: a tooth body, which is used to connect to the stator yoke of the stator core and extend axially along the stator yoke; and a tooth tip, which is connected to the end face of the tooth body and includes a plurality of sub-tips, the plurality of sub-tips being arranged radially along the stator core, and adjacent sub-tips being staggered at at least one end face along the circumference of the stator core, so that the tooth tips form a stepped structure along at least one end of the circumference of the stator core. The stepped end face can effectively improve the utilization rate of the rotor permanent magnets, thereby improving the torque density of the motor. On the other hand, the flexible and variable stator tooth laminations can effectively improve the back electromotive force of the motor and reduce the cogging torque of the motor through a certain optimization design method.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a stator core, a stator, a motor and a fan. Background Art

[0002] In conventional axial flux motors, the stator tooth tip surfaces are usually flat, resulting in the slot distance between adjacent stator tooth tips increasing with the increase of the stator yoke outer diameter. On the one hand, this reduces the utilization rate of the permanent magnets, and on the other hand, it introduces harmonics, resulting in a decrease in the sinusoidality of the back electromotive force and an increase in the tooth slot torque pulsation, affecting the application expansion of axial motors. Summary of the Invention

[0003] In order to solve at least one of the above technical problems, a first object of the present invention is to provide a stator tooth of a stator core.

[0004] A second object of the present invention is to provide a stator core including the above-mentioned stator teeth.

[0005] A third object of the present invention is to provide a stator including the stator core.

[0006] A fourth object of the present invention is to provide a motor comprising the above-mentioned stator.

[0007] A fifth object of the present invention is to provide a fan comprising the above-mentioned motor.

[0008] In order to achieve the above-mentioned objectives, the technical solution of the first aspect of the present invention provides a stator tooth of a stator core, comprising: a tooth body, which is used to be connected to the stator yoke of the stator core and extends axially along the stator yoke; and a tooth tip, which is connected to the end face of the tooth body and includes at least two sub-tips, and the at least two sub-tips are arranged along the radial direction of the stator core, and at least one end face of adjacent sub-tips at both ends of the stator core along the circumference is staggered with each other, so that the tooth tip forms a stepped structure along at least one end of the circumference of the stator core.

[0009] The stator teeth provided by the technical solution of the first aspect of the present invention are suitable for axial motors, and their tooth tips are divided into multiple sub-tips. Since the multiple sub-tips are arranged along the radial direction of the stator core, and the adjacent sub-tips of the same stator tooth are staggered at at least one end face along the circumference of the stator core, the end face of at least one end of the tooth tip along the circumference of the stator core forms a stepped structure. Compared with the flat end face in the prior art, the stepped end face is convenient for rationally utilizing the space between adjacent stator teeth according to the specific structure of the motor, thereby facilitating the increase of the contact area between the stator teeth and the rotor permanent magnets, thereby improving the utilization rate of the rotor permanent magnets, and thus improving the torque density of the motor. At the same time, it is also convenient to utilize the stepped end face to rationally adjust the width of each radial portion of the slot between adjacent tooth tips on the stator core to reduce the introduction of harmonics, thereby effectively improving the back electromotive force of the motor, reducing the cogging torque of the motor, and facilitating the application expansion of the axial motor.

[0010] In addition, since the stator teeth have a certain thickness, multiple stator punchings can be used to stack and form them along their thickness direction. The present application divides the tooth tip into multiple sub-tips so that the end face of the tooth tip forms a stepped structure. Compared with the scheme using trapezoidal tooth tips (in this scheme, the sizes of adjacent stator punchings are different but the difference is small, so that the stacked tooth tips are trapezoidal in structure as a whole, and the two end faces of the tooth tips along the circumference of the stator core are basically inclined surfaces, rather than the stepped surfaces of the present application), the types of stator punchings used for stacking and forming the stator teeth can be significantly reduced, thereby improving the machinability of the stator teeth and reducing the difficulty of processing the stator teeth. For example: if the number of sub-tips is three, it is only necessary to select three sizes of stator punchings, stack them separately to form three pieces, and then stack them together to form a complete stator tooth. Multiple sub-tips can be stacked to form a stepped shape using stator punchings of corresponding shapes. Compared with the trapezoidal stator tooth tips, the types of punchings can be reduced, making it easier to process and form.

[0011] Among them, the thickness D of each sub-tip (such as D1, D2, D3, etc.) can be flexibly adjusted according to the specific usage scenario and processing and performance optimization requirements.

[0012] In addition, the stator teeth in the above technical solution provided by the present invention may also have the following additional technical features:

[0013] In the above technical solution, the tooth body has a median vertical plane, which extends along the axial direction of the stator core. The end faces of the sub-tips at both ends along the circumferential direction of the stator core are symmetrical about the median vertical plane. The spans L of adjacent sub-tips along the circumferential direction of the stator core are different, so that the end faces of adjacent sub-tips at both ends along the circumferential direction of the stator core are staggered with each other.

[0014] The two circumferential end faces of the tooth tip are symmetrical about the median vertical plane of the tooth body (which extends axially along the stator core). Adjacent tooth tips on the same stator tooth have different spans L along the circumferential direction of the stator core. This allows the end faces of adjacent tooth tips along the circumferential direction of the stator core to be staggered, resulting in a stepped structure at both ends of the tooth tip along the circumferential direction of the stator core. This results in a more regular structure for the stator tooth, making it easier to process, form, and assemble the windings. This also helps to further improve the utilization rate of the rotor permanent magnets and the back EMF of the motor. Furthermore, the different spans L of the multiple tooth tips facilitate flexible adjustment based on specific usage scenarios, processing, and performance optimization requirements.

[0015] In the above technical solution, along the radial direction of the stator core from the inside to the outside, the span L of the sub-tip along the circumferential direction of the stator core gradually increases.

[0016] Along the radial direction of the stator core, from the inside to the outside, the span L (such as L1, L2, L3, etc.) of the tooth tips along the circumference of the stator core gradually increases, which can effectively improve the situation in the prior art that the slot distance between adjacent stator tooth tips of the axial flux motor increases with the increase of the outer diameter of the stator yoke. Therefore, it is beneficial to improve the utilization rate of the rotor permanent magnets and reduce the introduction of harmonics, thereby avoiding the reduction of the sinusoidality of the back electromotive force and the increase of the tooth slot torque pulsation, which is beneficial to the application expansion of the axial motor.

[0017] In any of the above technical solutions, the tooth body extends along the axial direction of the stator core, and the tooth body includes a plurality of sub-body portions arranged radially along the stator core, the number of the sub-body portions is equal to the number of the sub-tip portions and corresponds one to one, and the sub-body portions and the corresponding sub-tip portions are integrally formed.

[0018] The tooth body comprises multiple sub-body sections, arranged radially along the stator core and corresponding one-to-one with the multiple sub-tips of the tooth tip. Each sub-body section is integrally formed with the corresponding sub-tips. This allows the entire stator tooth to be divided into multiple pieces radially along the stator core, which are then laminated to form the stator tooth. This simplifies the product structure, improving its overall integrity and eliminating the step of connecting the tooth tip to the tooth body, further improving assembly efficiency. For example, each piece can be formed by laminating multiple stator punchings of the same shape radially along the stator core, and then multiple pieces are laminated radially along the stator core to form the stator tooth.

[0019] In the above technical solution, the shapes of the multiple sub-bodies are consistent.

[0020] The shapes of the multiple sub-bodies are consistent, that is, the width H (along the circumference of the stator core, parallel to the length direction of the sub-tip) and the contour shape of the multiple sub-bodies are the same, which makes the shape of the tooth body of the stator tooth more regular, which is convenient for processing and forming, and is also conducive to simplifying the structure of the stator yoke and facilitating the assembly of the stator teeth and the stator yoke.

[0021] In any of the above technical solutions, a positioning portion is provided on the tooth body for adapting to the matching portion provided on the stator yoke; wherein the positioning portion includes a positioning protrusion, and the positioning protrusion is used to adapt to the matching portion configured as a positioning groove; and / or, the positioning portion includes a positioning groove, and the positioning groove is used to adapt to the matching portion configured as a positioning protrusion.

[0022] A positioning portion is provided on the tooth body, and a matching portion is correspondingly provided on the stator yoke. During assembly, the cooperation between the positioning portion and the matching portion can play a good positioning and limiting role, which is conducive to the rapid assembly of the tooth body and the stator yoke.

[0023] Inserting the positioning protrusion into the positioning groove effectively prevents relative movement between the stator tooth and the stator yoke, enabling rapid assembly of the tooth body and the stator yoke, and improving the stability of the connection between the stator tooth and the stator yoke. Furthermore, the positioning protrusion and positioning groove have a relatively simple structure, making them easy to process and form. Optionally, the positioning protrusion is a positioning rib extending along the length of the tooth tip.

[0024] In any of the above technical solutions, the number of the tooth tip is one, and one stator tooth tip is arranged on one end face of the tooth body; or the number of the tooth tip is two, and the two tooth tips are arranged on two end faces of the tooth body that are arranged opposite to each other.

[0025] The number of tooth tips on each tooth body can be adjusted according to actual needs. Specifically, a stator tooth body can have one tooth tip, or a stator tooth body can have two tooth tips, and the two tooth tips can be respectively provided on the two end faces of the tooth body.

[0026] In any of the above technical solutions, the stator teeth are formed by laminating a plurality of stator punching sheets.

[0027] The stator teeth are formed by laminating multiple stator punchings, which has a simple structure and is easy to process and form. Of course, the stator teeth can also be formed by other methods such as bonding or clamping.

[0028] The technical solution of the second aspect of the present invention provides a stator core, comprising the stator teeth as described in any one of the technical solutions of the first aspect.

[0029] The stator core provided by the technical solution of the second aspect of the present invention includes the stator teeth described in any one of the technical solutions of the first aspect, and thus has all the beneficial effects of any of the above technical solutions, which will not be repeated here.

[0030] Specifically, the stator teeth are connected to the stator yoke of the stator core, and the tooth bodies of the stator teeth extend along the axial direction of the stator yoke, ensuring that the motor after assembly is an axial motor.

[0031] The material of the stator teeth and the stator yoke can be silicon steel sheets. Other solutions that can achieve the purpose of the present invention should be within the scope of protection of the present invention.

[0032] In the above technical solution, there are multiple stator teeth, and the multiple stator teeth are evenly distributed along the circumference of the stator yoke.

[0033] There are multiple stator teeth, which are evenly distributed along the circumference of the stator yoke, making the structure of the stator core more regular, which is not only convenient for processing and forming, but also conducive to increasing the number of windings, thereby helping to improve the power level of the stator core.

[0034] In the above technical solution, the shapes of the plurality of stator teeth are the same.

[0035] The shapes of multiple stator teeth are the same, which further improves the regularity of the stator core structure and is beneficial to the stability of the motor performance.

[0036] In the above technical solution, the minimum spacing S between the corresponding sub-tips of any adjacent stator teeth is equal.

[0037] The minimum spacing S between the sub-tips corresponding to any adjacent stator teeth is equal, making the product structure more regular, easier to process and more aesthetically pleasing. Of course, the minimum spacing S between the sub-tips corresponding to adjacent stator teeth can also be unequal, for example, gradually increasing in the radial direction outward, and can be flexibly adjusted according to specific usage scenarios and processing performance optimization requirements.

[0038] In any of the above technical solutions, the stator yoke is detachably connected to the stator teeth.

[0039] The stator yoke and stator teeth are detachably connected, allowing winding to be installed regardless of the shape of the stator core. Each stator tooth can be reattached to the stator yoke after winding is complete, providing flexibility and improving winding efficiency. Furthermore, by properly arranging the size of the stator teeth or the spacing between them, the size of the winding slots can be adjusted, allowing for flexible configuration of the number of winding sets and the appropriate adjustment of the stator core's power rating.

[0040] Of course, the stator teeth and the stator yoke may also be bonded or bonded in other ways to form an integrated structure, that is, the stator teeth and the stator yoke cannot be disassembled after assembly.

[0041] In the above technical solution, the stator yoke is provided with stator yoke slots adapted to the shape of the tooth bodies of the stator teeth, and the tooth bodies are plug-fitted into the stator yoke slots.

[0042] A stator yoke slot is provided on the stator yoke. When the stator teeth are assembled with the stator yoke, each stator tooth is directly passed through the stator yoke slot that matches its shape, thereby realizing rapid assembly of the stator teeth and the stator yoke, and effectively improving the assembly efficiency of the stator teeth and the stator yoke.

[0043] In the above technical solution, the stator yoke slot passes through at least one axial end face of the stator yoke part; and / or, the stator yoke slot and the inner circumference and outer circumference of the stator yoke part have a radial distance from each other in the stator core; or, the stator yoke slot passes through the inner circumference and / or outer circumference of the stator yoke part.

[0044] The stator yoke slot can axially pass through one end face of the stator yoke part, or axially pass through both end faces of the stator yoke part, that is, the stator teeth can be inserted in the stator yoke slot passing through one end face of the stator yoke part, or can be inserted in the stator yoke slot passing through both end faces of the stator yoke part, so that the connection method between the stator teeth and the stator yoke part is diverse, and the assembly method of the winding is more flexible, thereby meeting the different needs of users.

[0045] There is a radial distance between the stator yoke slots and the inner and outer circumferences of the stator yoke part, that is, the stator yoke slots penetrate the stator yoke part in the axial direction and are not directly connected to the inner and outer circumferences of the stator yoke part. The stator teeth are inserted into the stator yoke slots along the axial direction of the stator yoke part to be connected to the stator yoke part, thereby avoiding the stator teeth from being separated from the stator yoke part along the outer or inner circumference of the stator yoke part from the stator yoke slots, thereby improving the connection reliability between the stator teeth and the stator yoke part.

[0046] The stator yoke slots can also radially penetrate the inner circumference of the stator yoke part, and there is a radial distance between the stator teeth and the outer circumference of the stator yoke part. The stator teeth can then be radially inserted into the stator yoke slots from the inner circumference of the stator yoke part. The connection method is flexible and facilitates the assembly between the stator teeth and the stator yoke part.

[0047] The stator yoke slots can also radially penetrate the outer circumference of the stator yoke part, and there is a radial distance between the stator teeth and the inner circumference of the stator yoke part. The stator teeth can then be inserted radially into the stator yoke slots from the outer circumference of the stator yoke part. The connection method is flexible and facilitates the assembly between the stator teeth and the stator yoke part.

[0048] The stator yoke slots can also radially penetrate the inner and outer circumferences of the stator yoke part, that is, the stator yoke slots are directly connected to the outer and inner circumferences of the stator yoke part at the same time, and the stator teeth can be inserted into the stator yoke slots axially or radially from the outer or inner circumference to form a complete stator core. The connection method is flexible and facilitates the assembly between the stator teeth and the stator yoke part.

[0049] In the above technical solution, the stator yoke is provided with a stator boss that is adapted to the shape of the tooth body of the stator tooth, and the stator boss is engaged with the tooth body.

[0050] The stator boss is arranged on the stator yoke, and the stator boss is engaged with the tooth body to realize the rapid assembly of the stator teeth and the stator yoke, which is beneficial to improving the assembly efficiency of the stator teeth and the stator yoke.

[0051] Furthermore, the stator yoke can also be provided with stator yoke slots and stator bosses at the same time. When the stator teeth are assembled with the stator yoke, each stator tooth is directly passed through the stator yoke slot that matches its shape or the stator teeth are clamped with the stator boss. Even part of the multiple stator teeth can be passed through the stator yoke slots, and the remaining stator teeth are clamped with the stator boss. Any of the above methods can realize the rapid assembly of the stator teeth and the stator yoke, effectively improving the assembly efficiency of the stator teeth and the stator yoke.

[0052] In any of the above technical solutions, the stator yoke is an integrated structure; or, the stator yoke includes a plurality of split sub-yokes, and the plurality of sub-yokes are spliced ​​together to form the stator yoke.

[0053] The stator yoke can be a single piece, integrally formed, which helps improve product integrity and assembly efficiency. The stator yoke can also be formed by splicing multiple sub-yoke blocks, which helps improve the material utilization rate of the stator yoke.

[0054] In any of the above technical solutions, a through hole is provided on the stator yoke, and the through hole is located between two adjacent stator teeth.

[0055] A through hole is provided on the stator yoke and is located between two adjacent stator teeth. The through hole can be used for welding the edge of the stator yoke, or for facilitating the fixed connection between the stator yoke and the casing or other structures, and can also be used for winding wire passing.

[0056] In the above technical solution, there are multiple through holes, and the multiple through holes are distributed at intervals along the circumference of the stator yoke.

[0057] Multiple through-holes are spaced circumferentially around the stator yoke, facilitating stator core assembly, improving the connection strength between the stator core and other structures, and facilitating stator core winding. Furthermore, the stator teeth are evenly distributed radially along the stator yoke, with each through-hole located midway between two adjacent stator teeth (i.e., at the angle bisector).

[0058] The technical solution of the third aspect of the present invention provides a stator, comprising a stator core as described in any one of the technical solutions of the second aspect.

[0059] The stator provided by the technical solution of the third aspect of the present invention includes the stator core described in any one of the technical solutions of the second aspect, and thus has all the beneficial effects of any of the above technical solutions, which will not be repeated here.

[0060] Specifically, the stator winding is wound on the teeth of the stator core.

[0061] Furthermore, the winding is wound around the stator teeth and located on the end face of the stator yoke. There may be multiple windings, and the coil shapes of the windings may be the same or different. There may be one, two, or more windings.

[0062] The technical solution of the fourth aspect of the present invention provides a motor, comprising: at least one stator as described in the technical solution of the third aspect; and at least one rotor, each rotor being arranged corresponding to the stator.

[0063] The motor provided by the technical solution of the fourth aspect of the present invention includes the stator provided by the technical solution of the third aspect, and thus has all the beneficial effects of any of the above technical solutions, which will not be repeated here.

[0064] It should be noted that the types of motors include but are not limited to single-stator single-rotor motors, single-stator dual-rotor motors, single-rotor dual-stator motors, and dual-stator dual-rotor motors, and the number of stators and the number of rotors can be one or more.

[0065] In the above technical solution, the number of the stators is smaller than the number of the rotors, and any one of the stators is arranged between two adjacent rotors; or, the number of the stators is greater than the number of the rotors, and any one of the rotors is arranged between two adjacent stators.

[0066] The number of stators is smaller than the number of rotors, and any two adjacent rotors share one stator. The structure is relatively regular, which helps to simplify the structure of the product and facilitates the assembly of the rotor and stator.

[0067] Alternatively, the number of stators is greater than the number of rotors, and any two adjacent stators share one rotor. This has a more regular structure, helps to simplify the product structure, and facilitates the assembly of the rotor and stator.

[0068] It is understood that the number of stators is recorded as the first number and the number of rotors is recorded as the second number. When the number of rotors is greater than the number of stators, and when the second number is N+1 and the first number is N, the N+1 rotors can be first arranged at intervals, and then the N stators can be inserted between two adjacent rotors to form a motor.

[0069] Alternatively, when the number of stators is greater than the number of rotors, and when the second number is N and the first number is N+1, the N+1 stators can be arranged at intervals first, and then the N rotors can be inserted between two adjacent stators to form a motor.

[0070] In the above technical solution, the number of the stators is at least two, and the number of stator teeth of at least two of the stators is the same, or the number of phases of at least two of the stators is the same; or, the number of the stators is at least two, and the number of stator teeth of at least two of the stators is different, or the number of phases of at least two of the stators is different.

[0071] There are at least two stators, and at least two stators have the same number of stator teeth to facilitate assembly of the stator teeth and the stator yoke, or at least two stators have the same number of phases, that is, the number of windings on each stator is the same, so that the power level on each stator is the same.

[0072] There are at least two stators, and at least two stators have different numbers of stator teeth, or at least two stators have different numbers of phases, that is, the number of windings on each stator is different. In this way, users can meet actual power requirements by performing reasonable winding on each stator.

[0073] In the above technical solution, the rotor is a permanent magnet rotor, a squirrel cage rotor, or a salient pole rotor; and / or, there are multiple rotors, the pole pairs of the multiple rotors are the same or different, and the multiple rotors rotate independently of each other.

[0074] The number of rotors is set to be multiple, and the rotating shafts of at least two rotors can be arranged coaxially, in parallel, or vertically. The arrangement methods are diverse and the installation method is more flexible.

[0075] The one or more rotors may be permanent magnet rotors, squirrel cage rotors, or salient pole rotors, and at least two of the rotors may have different numbers of pole pairs, or at least two of the rotors may have the same number of pole pairs.

[0076] There are multiple rotors, and at least two rotors can be set with the same number of pole pairs or different numbers of pole pairs to meet the needs of different working conditions.

[0077] In the above technical solution, the rotor is a permanent magnet rotor, which includes a rotor yoke and permanent magnets. The permanent magnets are attached to the rotor yoke and located between the rotor yoke and the stator tooth tips. This solution can meet the specific needs of the product.

[0078] In the above technical solution, the rotor is a permanent magnet rotor consisting solely of a plurality of permanent magnets magnetized using a Halbach array. The magnets are arranged in a ring and formed into an integral structure using injection molding. This solution saves material on the rotor yoke.

[0079] The technical solution of the fifth aspect of the present invention provides a fan, comprising a motor as described in any one of the technical solutions of the fourth aspect.

[0080] The fan provided by the technical solution of the fifth aspect of the present invention includes the motor described in any one of the technical solutions of the first aspect, and thus has all the beneficial effects of any of the above technical solutions, which will not be repeated here.

[0081] Specifically, the motor is installed in a housing of the fan. Further, the fan includes an impeller, which is fixedly connected to an output shaft of the motor.

[0082] Of course, the motor provided in this application can also be used in vehicles, compressors or other equipment.

[0083] 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

[0084] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments with reference to the following drawings, in which:

[0085] Figure 1 is a schematic structural diagram of a stator tooth according to an embodiment of the present invention;

[0086] Figure 2 is a schematic structural diagram of a stator tooth according to another embodiment of the present invention;

[0087] Figure 3 1 is a schematic diagram of a top view of a stator core according to an embodiment of the present invention;

[0088] Figure 4 is a structural schematic diagram of a stator yoke according to an embodiment of the present invention;

[0089] Figure 5 1 is a schematic structural diagram of a stator yoke according to an embodiment of the present invention;

[0090] Figure 6 1 is a schematic structural diagram of a stator yoke according to an embodiment of the present invention;

[0091] Figure 7 1 is a schematic structural diagram of a stator yoke according to an embodiment of the present invention;

[0092] Figure 8 This is a partial assembly diagram of a single-stator single-rotor motor provided by one embodiment of the present invention;

[0093] Figure 9 yes Figure 8 A schematic structural diagram of the stator core of the single-stator single-rotor motor shown;

[0094] Figure 10 This is a partial assembly diagram of a single-stator dual-rotor motor provided by one embodiment of the present invention;

[0095] Figure 11 yes Figure 10 The schematic diagram of the structure of the stator core of the single-stator dual-rotor motor shown;

[0096] in, Figures 1 to 11 The corresponding relationship between the reference numerals and component names is as follows:

[0097] Motor 1;

[0098] stator 2, rotor 3;

[0099] stator core 20, winding 21, stator teeth 22, stator yoke 23; first rotor yoke 31, first permanent magnet 32, second rotor yoke 33, second permanent magnet 34;

[0100] stator yoke slot 231, yoke end surface 232, through hole 233;

[0101] The first tooth portion 221 , the first sub-tip portion 2211 , and the first sub-body portion 2212 ; the second tooth portion 222 , the second sub-tip portion 2221 , and the second sub-body portion 2222 ; the third tooth portion 223 , the third sub-body portion 2231 , and the third sub-tip portion 2232 ; and the positioning protrusion 220 . DETAILED DESCRIPTION

[0102] 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.

[0103] 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.

[0104] Refer to the following Figures 1 to 11 The present invention describes stator teeth, stator cores, stators, motors, and fans according to some embodiments of the present invention.

[0105] First, an embodiment of the first aspect is introduced, specifically the stator teeth 22 .

[0106] Example 1

[0107] A stator tooth 22 of a stator core 20 includes a tooth body and a tooth tip.

[0108] Specifically, the tooth body is used to connect to the stator yoke 23 of the stator core 20 and extends along the axial direction of the stator yoke 23, as shown in FIG. Figure 9 and Figure 11 shown.

[0109] The tooth tip is connected to the end face of the tooth body, such as Figure 1 and Figure 2 The tooth tip includes at least two sub-tips, and all sub-tips of the tooth tip are arranged along the radial direction of the stator core 20, as shown in FIG. Figure 9 and Figure 11 and adjacent sub-tip portions along at least one end surface of both ends of the stator core 20 circumferential direction are staggered, so that the tooth tip along at least one end of the stator core 20 circumferential direction forms a stepped structure, such as Figure 1 and Figure 2 shown.

[0110] The stator tooth 22 provided in this embodiment is suitable for an axial motor, and its tooth tip is divided into multiple sub-tips. Since the multiple sub-tips are arranged along the radial direction of the stator core 20, and the adjacent sub-tips of the same stator tooth 22 are staggered from each other at least one end surface at both ends of the stator core 20 in the circumferential direction, the tooth tip forms a stepped structure along the end surface of at least one end of the stator core 20 in the circumferential direction.

[0111] Compared with the flat end face in the prior art, the stepped end face facilitates the rational use of the space between adjacent stator teeth 22 according to the specific structure of the motor 1, thereby facilitating the increase of the contact area between the stator teeth 22 and the permanent magnets of the rotor 3, thereby improving the utilization rate of the permanent magnets of the rotor 3, and thus improving the torque density of the motor 1.

[0112] At the same time, it is also convenient to use the stepped end face to reasonably adjust the radial width of the slots between adjacent tooth tips on the stator core 20 to reduce the introduction of harmonics, thereby effectively improving the back electromotive force of the motor 1, reducing the cogging torque of the motor 1, and facilitating the application expansion of the axial motor 1.

[0113] In addition, since the stator teeth 22 have a certain thickness, multiple stator punchings can be used to form the stator teeth 22 by stacking along the thickness direction. The present application divides the tooth tip into multiple sub-tips so that the end face of the tooth tip forms a stepped structure. Compared with the scheme using trapezoidal tooth tips (in this scheme, the sizes of adjacent stator punchings are different but the difference is small, so that the stacked tooth tips have a trapezoidal structure as a whole, and the two end faces of the tooth tips along the circumference of the stator core are basically inclined surfaces, rather than the stepped surfaces of the present application), the types of stator punchings used for stacking the stator teeth 22 can be significantly reduced, thereby improving the machinability of the stator teeth 22 and reducing the difficulty of machining the stator teeth 22.

[0114] For example, if there are three sub-tips (respectively designated as the first sub-tips 2211, the second sub-tips 2221, and the third sub-tips 2232), it is only necessary to select three sizes of stator punchings, stack them separately to form three pieces, and then stack them together to form a complete stator tooth 22. Multiple sub-tips can be stacked to form a stepped shape using stator punchings of corresponding shapes. Compared to trapezoidal stator tooth tips (all stator punchings have different sizes, so the number of stator punching types is the same as the number of stator punchings), the number of punching types can be reduced, making processing and forming easier.

[0115] Among them, the thickness D of each sub-tip (such as D1, D2, D3, etc.) can be flexibly adjusted according to the specific usage scenario and processing and performance optimization requirements.

[0116] Furthermore, the tooth body has a mid-vertical plane, which extends along the axial direction of the stator core. The end faces of the sub-tips at both ends along the circumference of the stator core are symmetrical about the mid-vertical plane. The spans L of adjacent sub-tips along the circumference of the stator core 20 are different, so that the end faces of adjacent sub-tips at both ends along the circumference of the stator core 20 are staggered with each other, as shown in FIG. Figure 1 and Figure 2 shown.

[0117] The two circumferential end faces of the sub-tips are symmetrical about the median vertical plane of the tooth body (the median vertical plane extends along the axial direction of the stator core), and the adjacent sub-tips on the same stator tooth 22 have different spans L along the circumferential direction of the stator core 20, which can make the end faces of the adjacent sub-tips at both ends along the circumferential direction of the stator core 20 staggered with each other, so that the tooth tips at both ends along the circumferential direction of the stator core 20 form a stepped structure, which makes the structure of the stator tooth 22 more regular, convenient for processing and forming, as well as for assembly and winding, and is also beneficial to further improve the utilization rate of the permanent magnets of the rotor 3 and further improve the back electromotive force of the motor 1.

[0118] At the same time, the spans L of multiple sub-tips are inconsistent, which facilitates flexible adjustment according to specific usage scenarios and processing and performance optimization requirements.

[0119] Furthermore, along the radial direction of the stator core 20 from the inside to the outside, the span L of the tip along the circumferential direction of the stator core 20 gradually increases, such as Figure 9 and Figure 11 shown.

[0120] From the inside to the outside of the radial direction of the stator core 20, the span L (such as L1, L2, L3, etc.) of the tooth tips along the circumference of the stator core 20 gradually increases, which can effectively improve the situation in the prior art that the slot distance between adjacent stator tooth tips of the axial flux motor 1 increases with the increase of the outer diameter of the stator yoke 23. Therefore, it is beneficial to improve the utilization rate of the permanent magnets of the rotor 3, and also to reduce the introduction of harmonics, thereby avoiding the reduction of the sinusoidality of the back electromotive force and the increase of the tooth slot torque pulsation, which is beneficial to the application expansion of the axial motor 1.

[0121] Furthermore, the tooth body extends along the axial direction of the stator core 20, and the tooth body includes a plurality of sub-body parts arranged along the radial direction of the stator core 20, such as Figure 1 and Figure 2 The number of the sub-body parts is equal to the number of the sub-tip parts and corresponds one to one, and the sub-body parts and the corresponding sub-tip parts are integrally formed.

[0122] The tooth body includes multiple sub-body parts, which are arranged along the radial direction of the stator core 20 and correspond one-to-one to the multiple sub-tip parts of the tooth tip. Each sub-body part and the corresponding sub-tip part are integrally formed. The entire stator tooth 22 can be divided into multiple tooth parts along the radial direction of the stator core 20, and then the multiple tooth parts are stacked to form the stator tooth 22. This simplifies the structure of the product, makes the product more integrated, and eliminates the step of connecting the tooth tip and the tooth body, further improving the assembly efficiency of the product.

[0123] In a specific example, there are three sub-body parts, namely the first sub-body part 2212, the second sub-body part 2222, and the third sub-body part 2231. The first sub-body part 2212 is integrally formed with the first sub-tip part 2211, and is composed of multiple stator punchings of the same shape stacked along the radial direction of the stator core 20 to form the first tooth part 221. The second sub-body part 2222 is integrally formed with the second sub-tip part 2221, and is composed of multiple stator punchings of the same shape stacked along the radial direction of the stator core 20 to form the second tooth part 222. The third sub-body part 2231 is integrally formed with the third sub-tip part 2232, and is composed of multiple stator punchings of the same shape stacked along the radial direction of the stator core 20 to form the third tooth part 223. Then, the first tooth part 221, the second tooth part 222, and the third tooth part 223 are stacked along the radial direction of the stator core 20 to form the stator tooth 22.

[0124] The span L1 of the first sub-apex 2211 , the span L2 of the second sub-apex 2221 , and the span L3 of the third sub-apex 2232 satisfy the relationship: L1<L2<L3.

[0125] The thickness D1 of the first sub-tip portion 2211 , the thickness D2 of the second sub-tip portion 2221 , and the thickness D3 of the third sub-tip portion 2232 can be adjusted according to specific usage scenarios.

[0126] Optionally, the shapes of the multiple sub-bodies are consistent, such as Figure 1 and Figure 2 shown.

[0127] The shapes of the multiple sub-bodies are consistent, that is, the width H (along the circumference of the stator core 20, parallel to the length direction of the sub-tip) and the contour shape of the multiple sub-bodies are the same, which makes the shape of the tooth body of the stator tooth 22 more regular, which is convenient for processing and forming, and is also beneficial to simplifying the structure of the stator yoke 23, making it easier to assemble the stator teeth 22 and the stator yoke 23.

[0128] Specifically, the number of tooth tips is one, and one stator tooth tip is provided on one end face of the tooth body. Figure 1 shown.

[0129] Furthermore, the stator teeth 22 are formed by laminating a plurality of stator punching sheets.

[0130] The stator teeth 22 are formed by laminating a plurality of stator punching sheets, and have a simple structure and are easy to process and form. Of course, the stator teeth 22 can also be formed by other methods such as bonding, clamping, etc.

[0131] Example 2

[0132] The difference from the first embodiment is that there are two tooth tips, which are arranged on two end faces of the tooth body that are opposite to each other. Figure 2 shown.

[0133] The number of tooth tips on each tooth body can be adjusted according to actual needs. Specifically, a stator 2 tooth body can have one tooth tip, a stator 2 tooth body can also have two tooth tips, and the two tooth tips can be respectively provided on the two end faces of the tooth body.

[0134] Optionally, the two tooth tips have the same shape and are symmetrical to each other, such as Figure 2 As shown. This makes the structure of the stator teeth 22 more regular, which is beneficial to improving the structural regularity of the stator core 20. Accordingly, the tooth body can be designed as a mirror-symmetrical structure, with the symmetry plane parallel to the two tooth tips and the distance between the two tooth tips being equal, which is equivalent to Figure 1 For example, two positioning protrusions 220 are provided on the stator tooth body, and the two positioning protrusions are also mirror-symmetrical about the symmetry plane, such as Figure 2 shown.

[0135] Example 3

[0136] The difference from any of the above embodiments is that: on the basis of any of the above embodiments, further, a positioning portion is provided on the tooth body for adapting to the matching portion provided on the stator yoke 23.

[0137] A positioning portion is provided on the tooth body, and a corresponding matching portion is provided on the stator yoke 23 . During assembly, the positioning portion and the matching portion cooperate to provide good positioning and limiting effects, which is beneficial for rapid assembly of the tooth body and the stator yoke 23 .

[0138] Optionally, the positioning portion includes a positioning protrusion 220, such as Figure 1 and Figure 2 The positioning protrusion 220 is used to adapt to the matching portion configured as a positioning groove.

[0139] Optionally, the positioning portion includes a positioning groove, and the positioning groove is adapted to fit a matching portion configured as a positioning protrusion 220 .

[0140] Inserting the positioning protrusion 220 into the positioning groove effectively prevents relative movement between the stator tooth 22 and the stator yoke 23, enabling rapid assembly of the tooth body and the stator yoke 23 and improving the stability of the connection between the stator tooth 22 and the stator yoke 23. Furthermore, the positioning protrusion 220 and the positioning groove have a relatively simple structure, facilitating machining and forming. Optionally, the positioning protrusion 220 is a positioning rib extending along the length of the tooth tip.

[0141] like Figure 3 As shown, the stator core 20 provided by the embodiment of the second aspect of the present invention includes: a stator yoke 23 and a stator tooth 22 as in any one of the embodiments of the first aspect. The stator tooth 22 is connected to the stator yoke 23, as shown in FIG. Figure 9 and Figure 11 shown.

[0142] The stator core 20 provided in the embodiment of the second aspect of the present invention includes the stator teeth 22 of any one of the embodiments of the first aspect, and thus has all the beneficial effects of any of the above embodiments, which will not be repeated here.

[0143] The material of the stator teeth 22 and the stator yoke 23 may be silicon steel sheets. Other solutions that can achieve the purpose of the present invention should fall within the scope of protection of the present invention.

[0144] Optionally, there are multiple stator teeth 22, and the multiple stator teeth 22 are evenly distributed along the circumference of the stator yoke 23, such as Figure 3 、 Figure 9 and Figure 11 shown.

[0145] There are multiple stator teeth 22, which are evenly distributed along the circumference of the stator yoke 23, making the structure of the stator core 20 more regular, which is not only convenient for processing and forming, but also beneficial for increasing the number of windings 21, thereby helping to improve the power level of the stator core 20.

[0146] Optionally, the shapes of the plurality of stator teeth 22 are the same, such as Figure 3 、 Figure 9 and Figure 11 shown.

[0147] The multiple stator teeth 22 have the same shape, which further improves the regularity of the structure of the stator core 20 and is beneficial to the stability of the performance of the motor 1.

[0148] Optionally, the minimum spacing S between the corresponding sub-tips of any adjacent stator teeth 22 is equal, such as Figure 3 、 Figure 9 and Figure 11 shown.

[0149] The minimum spacing S between the corresponding tips of any adjacent stator teeth 22 is equal, which makes the product structure more regular, easier to process and shape, and more beautiful.

[0150] For example, when the stator tooth 22 includes three tooth portions, the minimum spacing S1 between adjacent first sub-tips 2211, the minimum spacing S2 between adjacent second sub-tips 2221, and the minimum spacing S3 between adjacent third sub-tips 2232 satisfy: S1 = S2 = S3.

[0151] Of course, the minimum spacing S between the sub-tips corresponding to adjacent stator teeth 22 may also be unequal, for example, S1 < S2 < S3, and can be flexibly adjusted according to specific usage scenarios and processing performance optimization requirements.

[0152] Furthermore, the stator yoke 23 and the stator teeth 22 are detachably connected.

[0153] The stator yoke 23 and the stator teeth 22 are detachably connected, so that the winding 21 is not restricted by the shape of the stator core 20 when winding. Each stator tooth 22 can be connected to the stator yoke 23 after the winding 21 is wound. The winding method is flexible and the winding efficiency of the winding 21 is improved.

[0154] In addition, by properly arranging the size of the stator teeth 22 or the spacing between the stator teeth 22, the size of the winding slots can be adjusted, so that the number of sets of the windings 21 can be flexibly set, and the power level of the stator core 20 can be reasonably adjusted.

[0155] Of course, the stator teeth 22 and the stator yoke 23 may also be bonded or bonded in other ways to form an integrated structure, that is, the stator teeth 22 and the stator yoke 23 cannot be disassembled after being assembled.

[0156] Optionally, the stator yoke 23 is provided with a stator yoke slot 231 (eg, Figures 4 to 7 As shown), the tooth body is inserted into the stator yoke slot 231, as shown Figure 9 and Figure 11 shown.

[0157] A stator yoke slot 231 is provided on the stator yoke 23. When the stator teeth 22 are assembled with the stator yoke 23, each stator tooth 22 is directly passed through the stator yoke slot 231 that matches its shape, thereby realizing rapid assembly of the stator teeth 22 and the stator yoke 23, thereby effectively improving the assembly efficiency of the stator teeth 22 and the stator yoke 23.

[0158] In some embodiments of the present invention, the stator yoke slot 231 passes through at least one axial end surface of the stator yoke portion 23 .

[0159] The stator yoke slot 231 may axially penetrate one end surface of the stator yoke portion 23, or may axially penetrate both end surfaces of the stator yoke portion 23 (e.g., Figures 4 to 7 As shown), the stator teeth 22 can be inserted into the stator yoke slots 231 passing through one end face of the stator yoke 23, or can be inserted into the stator yoke slots 231 passing through both end faces of the stator yoke 23, so that the connection method between the stator teeth 22 and the stator yoke 23 is diverse, and the assembly method of the winding 21 is more flexible, thereby meeting the different needs of users.

[0160] In one embodiment of the present invention, the stator yoke slot 231 and the inner circumference and outer circumference of the stator yoke portion 23 are spaced apart in the radial direction of the stator core 20, as shown in FIG. Figure 5 shown.

[0161] There is a radial distance between the stator yoke slot 231 and the inner circumference and outer circumference of the stator yoke part 23, that is, the stator yoke slot 231 penetrates the stator yoke part 23 along the axial direction and is not directly connected to the inner circumference and outer circumference of the stator yoke part 23, then the stator tooth 22 is inserted into the stator yoke slot 231 along the axial direction of the stator yoke part 23 to be connected to the stator yoke part 23, thereby avoiding the stator tooth 22 from being separated from the stator yoke part 23 along the outer circumference or inner circumference of the stator yoke part 23 from the stator yoke slot 231, thereby improving the connection reliability between the stator tooth 22 and the stator yoke part 23.

[0162] In one embodiment of the present invention, the stator yoke slot 231 passes through the inner circumference of the stator yoke portion 23. Figure 7 shown.

[0163] The stator yoke slot 231 can also radially penetrate the inner circumference of the stator yoke part 23, and there is a radial distance between the stator tooth 22 and the outer circumference of the stator yoke part 23. The stator tooth 22 can be radially inserted into the stator yoke slot 231 from the inner circumference of the stator yoke part 23. The connection method is flexible and facilitates the assembly between the stator tooth 22 and the stator yoke part 23.

[0164] In one embodiment of the present invention, the stator yoke slot 231 penetrates the outer circumference of the stator yoke portion 23. Figure 4 and Figure 6 shown.

[0165] The stator yoke slot 231 can also radially penetrate the outer peripheral surface of the stator yoke part 23, and there is a radial distance between the stator tooth 22 and the inner peripheral surface of the stator yoke part 23. Then, the stator tooth 22 can be radially inserted into the stator yoke slot 231 from the outer peripheral surface of the stator yoke part 23. The connection method is flexible and facilitates the assembly between the stator tooth 22 and the stator yoke part 23.

[0166] In one embodiment of the present invention, the stator yoke slots 231 penetrate the inner and outer circumferential surfaces of the stator yoke portion 23 .

[0167] The stator yoke slot 231 can also radially penetrate the inner and outer circumferences of the stator yoke portion 23, that is, the stator yoke slot 231 is directly connected to the outer and inner circumferences of the stator yoke portion 23 at the same time, and the stator teeth 22 can be inserted into the stator yoke slot 231 axially or radially from the outer or inner circumference to form a complete stator core 20. The connection method is flexible and facilitates the assembly between the stator teeth 22 and the stator yoke portion 23.

[0168] In some embodiments of the present invention, the stator yoke 23 is provided with a stator boss that matches the shape of the tooth body of the stator tooth 22 , and the stator boss is engaged with the tooth body.

[0169] The stator boss is provided on the stator yoke 23 , and the stator teeth 22 and the stator yoke 23 can be quickly assembled by engaging the stator boss with the tooth body, which is beneficial to improving the assembly efficiency of the stator teeth 22 and the stator yoke 23 .

[0170] Furthermore, the stator yoke 23 can also be provided with a stator yoke slot 231 and a stator boss at the same time. When the stator teeth 22 are assembled with the stator yoke 23, each stator tooth 22 is directly passed through the stator yoke slot 231 that matches its shape or the stator tooth 22 is clamped to the stator boss. Even a part of the multiple stator teeth 22 can be set through the stator yoke slot 231, and the remaining stator teeth 22 are clamped to the stator boss. Any of the above methods can realize the rapid assembly of the stator teeth 22 and the stator yoke 23, effectively improving the assembly efficiency of the stator teeth 22 and the stator yoke 23.

[0171] In any of the above embodiments, optionally, the stator yoke 23 is an integrated structure.

[0172] Optionally, the stator yoke 23 includes a plurality of split sub-yokes, and the plurality of sub-yokes are spliced ​​together to form the stator yoke 23 .

[0173] The stator yoke 23 can be a single piece, integrally formed, which is beneficial to improving the integrity of the product and improving assembly efficiency. The stator yoke 23 can also be formed by splicing multiple sub-yoke blocks, which is beneficial to improving the material utilization rate of the stator yoke 23.

[0174] In any of the above embodiments, optionally, a through hole 233 is provided on the stator yoke 23, and the through hole 233 is located between two adjacent stator teeth 22, such as Figure 6 shown.

[0175] A through hole 233 is provided on the stator yoke 23 and is located between two adjacent stator teeth 22. The through hole 233 can be used for welding the edge of the stator yoke 23 or for facilitating the fixed connection between the stator yoke 23 and the casing or other structures. The through hole 233 can also be used for passing the winding 21.

[0176] Furthermore, there are multiple through holes 233, and the multiple through holes 233 are distributed at intervals along the circumference of the stator yoke 23, such as Figure 6 shown.

[0177] A plurality of through holes 233 are provided at circumferential intervals on the stator yoke 23 , which is beneficial for assembling the stator core 20 , improving the connection strength between the stator core 20 and other structures, and also beneficial for winding the stator core 20 .

[0178] Furthermore, the plurality of stator teeth 22 are evenly distributed along the radial direction of the stator yoke 23, and any through hole 233 is provided at the middle portion (i.e., the angle bisector) between two adjacent stator teeth 22, such as Figure 6 As shown, the structure is more regular.

[0179] The stator 2 provided in the embodiment of the third aspect of the present invention includes: a stator core 20 and a winding 21 as in any one of the embodiments of the second aspect. The winding 21 is wound around the teeth of the stator core 20.

[0180] The stator 2 provided in the embodiment of the third aspect of the present invention includes the stator core 20 of any one of the embodiments of the second aspect, and thus has all the beneficial effects of any of the above embodiments, which will not be repeated here.

[0181] Furthermore, the winding 21 is wound around the tooth body of the stator tooth 22 and is located on the yoke end surface 232 of the stator yoke 23, as shown in FIG. Figure 8 and Figure 10 There may be multiple windings 21, and the coil shapes of the multiple windings 21 may be the same or different. There may be one, two or more windings 21.

[0182] In some embodiments of the present invention, specifically, the stator 2 includes: a stator core 20 and at least one winding 21. The stator core 20 includes a stator yoke 23 and at least one stator tooth 22. The stator yoke 23 is laminated in the axial direction. Each stator tooth 22 is composed of a plurality of stator tooth laminations stacked radially along the stator yoke 23. The stator tooth 22 includes a stator tooth body and a stator tooth tip, and the stator tooth tip spans of the plurality of stator tooth laminations are inconsistent. Each stator tooth 22 is arranged in the axial direction of the stator yoke 23, and the stator tooth 22 is detachably connected to the stator yoke 23. The stator yoke 23 is provided with a stator yoke slot 231 and / or a stator boss that matches the shape of the stator tooth 22. The stator tooth 22 passes through the stator yoke slot 231 and / or the stator boss to form the stator core 20. The winding 21 is wound around the stator teeth and is located on the end surface of the stator yoke 23. The winding 21 can be one set, two sets or multiple sets.

[0183] The stator 2 provided in this embodiment includes a stator core 20, which includes a stator yoke 23, at least one stator tooth 22 and at least one winding 21. That is, the number of stator teeth 22 and winding 21 can be one or more. By arranging each stator tooth 22 along the axial direction of the stator yoke 23 and each stator tooth 22 is detachably connected to the stator yoke 23, the winding 21 is not restricted by the shape of the stator core 20 during winding. Each stator tooth 22 can be connected to the stator yoke 23 after the winding 21 is wound. The winding method is flexible, which improves the winding efficiency of the winding 21.

[0184] In addition, by reasonably arranging the size of the stator teeth 22 or the spacing between the stator teeth 22 to adjust the size of the winding slots, the number of sets of windings 21 can be flexibly set, so that the power level of the stator core 20 can be reasonably adjusted, solving the problem in the prior art that the power level of the stator core 20 is limited by the single winding slot size.

[0185] Moreover, when assembling the stator teeth 22 and the stator yoke 23, each stator tooth 22 is directly passed through the stator yoke slot 231 that matches its shape, or the stator tooth 22 is clamped onto the stator boss. Even a part of the multiple stator teeth 22 can be set through the stator yoke slot 231, and the remaining stator teeth 22 are clamped onto the stator boss. Any of the above methods can achieve rapid assembly of the stator teeth 22 and the stator yoke 23, effectively improving the assembly efficiency of the stator teeth 22 and the stator yoke 23.

[0186] The material of the stator teeth 22 and the stator yoke 23 may be silicon steel sheets. Other solutions that can achieve the purpose of the present invention should fall within the scope of protection of the present invention.

[0187] It should be noted that there may be multiple windings 21 , and the coil shapes of the multiple windings 21 may be the same or different.

[0188] In the above embodiment, the stator teeth 22 specifically include a plurality of stator tooth laminations, which are radially stacked along the stator yoke 23. The thickness D (D1, D2, D3...) of the plurality of stator tooth laminations can be flexibly adjusted according to the specific usage scenario and processing and performance optimization requirements.

[0189] In the above embodiment, the stator teeth 22 specifically include a stator tooth body and a stator tooth tip. The stator tooth tip spans of various stator tooth laminations vary and can be flexibly adjusted based on specific usage scenarios, processing requirements, and performance optimization requirements. Optionally, the stator tooth tip spans L (L1, L2, L3, ...) of various stator tooth laminations are configured such that the minimum spacing S (S1, S2, S3, ...) between adjacent teeth of each stator tooth lamination is the same.

[0190] In the above embodiment, the stator tooth 22 specifically includes a stator tooth body and a stator tooth tip. Furthermore, the stator tooth body structures of the various stator tooth laminations are consistent. Specifically, the stator tooth body width H and profile shape of the various stator tooth laminations are the same.

[0191] In the above embodiment, optionally, the stator yoke slot 231 penetrates at least one end surface of the stator yoke portion 23 in the axial direction.

[0192] The stator yoke slot 231 can axially penetrate one end face of the stator yoke part 23, or axially penetrate both end faces of the stator yoke part 23, that is, the stator tooth 22 can be inserted in the stator yoke slot 231 passing through one end face of the stator yoke part 23, or can be inserted in the stator yoke slot 231 passing through both end faces of the stator yoke part 23, so that the connection method between the stator tooth 22 and the stator yoke part 23 is diverse, and the assembly method of the winding 21 is more flexible to meet the different needs of users.

[0193] In the above embodiment, optionally, there is a distance between the stator yoke slot 231 and the outer peripheral surface of the stator yoke part 23 in the radial direction, and there is a distance between the stator yoke slot 231 and the inner peripheral surface of the stator yoke part 23 in the radial direction; or the stator yoke slot 231 is connected to the outer peripheral surface and / or inner peripheral surface of the stator yoke part 23.

[0194] There is a radial distance between the stator yoke slot 231 and the outer circumference and inner circumference of the stator yoke part 23, that is, the stator yoke slot 231 passes through the stator yoke part 23 and is not connected to the outer circumference of the stator yoke part 23. The stator tooth 22 is inserted into the stator yoke slot 231 along the axial direction of the stator yoke part 23 to be connected to the stator yoke part 23, thereby avoiding the stator tooth 22 from being separated from the stator yoke part 23 along the outer circumference or inner circumference of the stator yoke part 23 from the stator yoke slot 231, thereby improving the connection reliability between the stator tooth 22 and the stator yoke part 23.

[0195] The stator yoke slot 231 is connected to the outer circumference or inner circumference of the stator yoke part 23, so the stator teeth 22 can be inserted into the stator yoke slot 231 from the outer circumference or inner circumference of the stator yoke part 23. The connection method is flexible and facilitates the assembly between the stator teeth 22 and the stator yoke part 23.

[0196] The stator yoke slots 231 are connected to both the outer and inner circumferences of the stator yoke portion 23 , and the stator teeth 22 can be inserted into the stator yoke slots 231 axially or radially from the outer or inner circumference to form a complete stator core 20 .

[0197] In the above embodiment, the stator tooth tip is provided at the end of the stator tooth body. Optionally, the stator tooth tip and the stator tooth body are integrally formed, which simplifies the product structure, improves the integrity of the product, and eliminates the step of connecting the stator tooth tip and the stator tooth body, further improving the assembly efficiency of the product.

[0198] In the above embodiment, optionally, the number of the stator tooth tip is one, and the stator tooth tip is provided at one end of the stator tooth body.

[0199] Optionally, the number of the stator tooth tips is two, and one stator tooth tip is provided at each end of the stator tooth body.

[0200] In this embodiment, the number of stator tooth tips provided on each stator tooth body can be adjusted according to actual needs. Specifically, one stator tooth body can be provided with one stator tooth tip, and one stator tooth body can also be provided with two stator tooth tips.

[0201] It should be noted that the two stator tooth tips can be respectively arranged on the end faces of the stator tooth body.

[0202] In the above embodiment, the stator 2 further includes: a positioning groove and a positioning rib with matching shapes, wherein one of the positioning groove and the positioning rib is provided on the stator tooth 22, and the other is provided on the stator yoke slot 231 and / or the stator boss to limit the position of the stator tooth 22 to the stator yoke part 23.

[0203] By providing a positioning rib on the stator tooth 22, providing a positioning groove on the stator yoke slot 231 or the stator boss, or providing a positioning groove on both the stator yoke slot 231 and the stator boss, when the stator tooth 22 is assembled with the stator yoke 23, the positioning rib is inserted into the positioning groove to play a limiting role, thereby preventing the stator tooth 22 and the stator yoke slot 231 from relative movement, thereby improving the stability of the connection between the stator tooth 22 and the positioning yoke slot.

[0204] Similarly, a positioning groove can be provided on the stator tooth 22, a positioning rib can be provided on the stator yoke slot 231 or the stator boss, or a positioning rib can be provided on both the stator yoke slot 231 and the stator boss. When the stator tooth 22 is assembled with the stator yoke 23, the positioning rib is inserted into the positioning groove to play a limiting role, thereby preventing the stator tooth 22 and the stator yoke 23 from relative movement, thereby improving the stability of the connection between the stator tooth 22 and the positioning yoke.

[0205] In the above embodiment, there are multiple stator yoke slots 231 , and the multiple stator yoke slots 231 are evenly arranged on the stator yoke portion 23 around the axis of the stator core 20 .

[0206] There are multiple stator yoke slots 231. By evenly arranging multiple stator yoke slots 231 on the stator yoke part 23 around the axis of the stator core 20, the structure of the product is more regular and the number of stator yoke slots 231 is increased. Correspondingly, there are also multiple stator teeth 22. Multiple stator teeth 22 are inserted into the corresponding multiple stator yoke slots 231, thereby increasing the number of windings 21, which in turn helps to improve the power level of the stator core 20.

[0207] In the above embodiment, the cross section of the stator yoke 23 is one of a circle, an ellipse, and a regular polygon.

[0208] The cross section of the stator yoke 23 is one of a circle, an ellipse, and a regular polygon, and the structure is relatively regular, which is convenient for processing and forming, suitable for mass production, and helps to improve the aesthetics of the product.

[0209] In the above embodiment, the stator yoke 23 may be formed as a whole piece, or may be formed by splicing together a plurality of yoke blocks, which is beneficial to improving the material utilization rate of the stator yoke 23 .

[0210] In the above embodiment, through holes 233 are evenly distributed on the symmetry lines of the adjacent stator yoke slots 231 and / or stator bosses of the stator yoke 23, which can be used for welding the edges of the stator yoke 23 or facilitating the fixed connection of the stator yoke 23 to the casing, etc., or for passing the winding 21.

[0211] like Figure 8 and Figure 10 As shown, the motor 1 provided by the embodiment of the fourth aspect of the present invention includes: at least one stator 2 as the embodiment of the third aspect and at least one rotor 3, each rotor 3 is arranged corresponding to the stator 2.

[0212] The motor 1 provided in the embodiment of the fourth aspect of the present invention includes the stator 2 provided in the embodiment of the third aspect, and thus has all the beneficial effects of any of the above embodiments, which will not be described in detail here.

[0213] It should be noted that the types of motors 1 include but are not limited to single-stator single-rotor motors (such as Figure 8 As shown), single stator dual rotor motor (as shown Figure 10 As shown), a single-rotor dual-stator motor, a dual-stator dual-rotor motor, the number of stators 2 and the number of rotors 3 can both be one or more.

[0214] Optionally, the number of stators 2 is smaller than the number of rotors 3 , and any stator 2 is disposed between two adjacent rotors 3 .

[0215] The number of stators 2 is smaller than the number of rotors 3 , and any two adjacent rotors 3 share one stator 2 . This has a relatively regular structure, helps to simplify the product structure, and facilitates the assembly of the rotor 3 and the stator 2 .

[0216] Optionally, the number of stators 2 is greater than the number of rotors 3 , and any rotor 3 is disposed between two adjacent stators 2 .

[0217] The number of stators 2 is greater than the number of rotors 3 , and any two adjacent stators 2 share one rotor 3 . This has a relatively regular structure, helps to simplify the product structure, and facilitates the assembly of the rotor 3 and the stator 2 .

[0218] It is understood that the number of stators 2 is recorded as the first number, and the number of rotors 3 is recorded as the second number. When the number of rotors 3 is greater than the number of stators 2, and when the second number is N+1 and the first number is N, the N+1 rotors 3 can be first arranged at intervals, and then the N stators 2 can be respectively inserted between two adjacent rotors 3 to form the motor 1.

[0219] Alternatively, when the number of stators 2 is greater than the number of rotors 3, and when the second number is N and the first number is N+1, the N+1 stators 2 can be arranged at intervals first, and then the N rotors 3 can be inserted between two adjacent stators 2 to form the motor 1.

[0220] Optionally, the number of the stators 2 is at least two, and the number of stator teeth 22 of at least two stators 2 is the same, or the number of phases of at least two stators 2 is the same.

[0221] The number of stators 2 is at least two, and the number of stator teeth 22 of at least two stators 2 is the same, which facilitates the assembly of the stator teeth 22 and the stator yoke 23, or the number of phases of at least two stators 2 is the same, that is, the number of windings 21 on each stator 2 is the same, so that the power level on each stator 2 is the same.

[0222] Optionally, the number of the stators 2 is at least two, and the number of stator teeth 22 of at least two stators 2 is different, or the number of phases of at least two stators 2 is different.

[0223] There are at least two stators 2 , and at least two stators 2 have different numbers of stator teeth 22 , or at least two stators 2 have different numbers of phases, that is, the number of windings 21 on each stator 2 is different. In this way, the user can meet actual power requirements by reasonably winding 21 on each stator 2 .

[0224] In the above embodiment, optionally, there are multiple rotors 3 , the multiple rotors 3 rotate independently of each other, and the rotation axes of at least two rotors 3 are coaxial, parallel or perpendicular.

[0225] The number of the rotors 3 is set to be multiple, and the rotating shafts of at least two rotors 3 can be coaxially arranged, parallel to each other, or perpendicular to each other. The arrangement methods are diverse and the installation method is more flexible.

[0226] Among them, one or more rotors 3 can be permanent magnet rotors 3 or squirrel cage rotors 3 or salient pole rotors 3, and at least two rotors 3 have different numbers of pole pairs, or at least two rotors 3 have the same number of pole pairs.

[0227] There are multiple rotors 3 , and at least two rotors 3 can be provided with the same number of pole pairs, or different numbers of pole pairs to meet the needs of different working conditions.

[0228] Optionally, the rotor 3 is a permanent magnet rotor 3, which includes a rotor yoke and permanent magnets. The permanent magnets are attached to the rotor yoke and located between the rotor yoke and the tooth tips of the stator 2. This solution can meet the specific needs of the product.

[0229] For example: the number of rotors 3 is two, such as Figure 10 As shown, the two rotors 3 are respectively recorded as the first rotor 3 and the second rotor 3, the rotor yoke 3 and the permanent magnet steel of the first rotor 3 are respectively recorded as the first rotor yoke 31 and the first permanent magnet steel 32, and the rotor yoke 3 and the permanent magnet steel of the second rotor 3 are respectively recorded as the second rotor yoke 33 and the second permanent magnet steel 34.

[0230] Or, as Figure 8 As shown, there is one rotor 3 , and the rotor yoke and permanent magnets of the rotor 3 can also be marked as a first rotor yoke 31 and a first permanent magnet 32 ​​.

[0231] Optionally, the rotor 3 is a permanent magnet rotor 3, which only includes a plurality of permanent magnets, which are magnetized using the Halbach method, are arranged in a ring shape, and are formed into an integral structure by injection molding. This solution saves material for the yoke of the rotor 3.

[0232] An embodiment of the fifth aspect of the present invention provides a wind turbine, comprising: a fuselage and a motor 1 as described in any one of the embodiments of the fourth aspect, wherein the motor 1 is mounted on the fuselage.

[0233] The blower provided in the embodiment of the fifth aspect of the present invention includes the motor 1 of any one of the embodiments of the first aspect, and thus has all the beneficial effects of any of the above embodiments, which will not be described in detail here.

[0234] Specifically, the body includes a housing and an impeller, the motor is installed in the housing of the fan, and the impeller is fixedly connected to the output shaft of the motor. Of course, the motor 1 provided in this application can also be used in vehicles, compressors or other equipment.

[0235] In summary, the present application has the following beneficial effects: the present application connects each stator tooth to the stator yoke in a detachable manner, so that the winding is not restricted by the shape of the stator core during winding, the winding method is flexible, and the winding efficiency of the winding is improved; in addition, by reasonably arranging the size of the stator teeth or the spacing between the stator teeth to adjust the size of the winding slots, the number of winding sets can be flexibly set, so that the power level of the stator core can be reasonably adjusted; and the stepped stator tooth tip surface composed of a plurality of stator tooth laminations can, on the one hand, effectively improve the utilization rate of the rotor permanent magnet, thereby improving the torque density of the motor, and on the other hand, the flexible and variable plurality of stator tooth laminations can effectively improve the back electromotive force of the motor and reduce the cogging torque of the motor through certain optimization design methods.

[0236] In the present invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "plurality" refers to two or more, unless expressly limited otherwise. Terms such as "installed," "connected," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; "connected" can mean a direct connection or an indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0237] In the description of the present invention, it should be understood that the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "front" and "back" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0238] 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.

[0239] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A stator core, characterized in that: The stator core includes stator teeth, and the stator teeth include: a tooth body, configured to be connected to a stator yoke of the stator core and extending in the axial direction of the stator yoke; and a tooth tip connected to an end face of the tooth body, comprising at least two sub-tips, the at least two sub-tips being arranged in a radial direction of the stator core, and at least one end face of adjacent sub-tips at both ends along the circumference of the stator core being staggered, so that the tooth tip forms a stepped structure along at least one end of the circumference of the stator core; The tooth body extends along the axial direction of the stator core, and includes a plurality of sub-body parts arranged along the radial direction of the stator core. The number of the sub-body parts is equal to the number of the sub-tip parts and corresponds one to one. The sub-body parts and the corresponding sub-tip parts are integrally formed. The plurality of sub-bodies have the same shape, and the width and outline of the plurality of sub-bodies are the same; There are two tooth tips, which are arranged on two end faces of the tooth body that are arranged opposite to each other; The stator yoke is provided with stator yoke slots and stator bosses at the same time; The stator yoke is provided with a stator yoke slot that matches the shape of the tooth body of the stator tooth, and the tooth body is inserted into the stator yoke slot; The stator yoke is provided with the stator boss which is adapted to the shape of the tooth body of the stator tooth, and the stator boss is engaged with the tooth body.

2. The stator core according to claim 1, characterized in that The tooth body has a median vertical plane, which extends along the axial direction of the stator core. The end faces of the sub-tips at both ends along the circumferential direction of the stator core are symmetrical about the median vertical plane. The spans L of adjacent sub-tips along the circumferential direction of the stator core are different, so that the end faces of adjacent sub-tips at both ends along the circumferential direction of the stator core are staggered with each other.

3. The stator core according to claim 2, characterized in that From inside to outside along the radial direction of the stator core, the span L of the sub-tip along the circumferential direction of the stator core gradually increases.

4. The stator core according to any one of claims 1 to 3, characterized in that: The tooth body is provided with a positioning portion for adapting to the matching portion provided on the stator yoke; Wherein, the positioning portion includes a positioning protrusion, and the positioning protrusion is used to adapt to the matching portion configured as a positioning groove; and / or, the positioning portion includes a positioning groove, and the positioning groove is used to adapt to the matching portion configured as a positioning protrusion.

5. The stator core according to claim 1, characterized in that There are multiple stator teeth, and the multiple stator teeth are evenly distributed along the circumference of the stator yoke.

6. The stator core according to claim 5, characterized in that The minimum spacing S between corresponding sub-tips of any adjacent stator teeth is equal.

7. The stator core according to claim 1, characterized in that The stator yoke slot passes through at least one axial end surface of the stator yoke portion; and / or The stator yoke slots are spaced apart from the inner circumference and the outer circumference of the stator yoke portion in the radial direction of the stator core; or the stator yoke slots penetrate the inner circumference and / or the outer circumference of the stator yoke portion.

8. The stator core according to claim 5 or 6, characterized in that: The stator yoke is an integrated structure; or The stator yoke comprises a plurality of split sub-yokes, and the plurality of sub-yokes are spliced ​​together to form the stator yoke.

9. The stator core according to claim 5 or 6, characterized in that: The stator yoke is provided with a through hole, and the through hole is located between two adjacent stator teeth.

10. The stator core according to claim 9, characterized in that There are a plurality of through holes, and the plurality of through holes are distributed at intervals along the circumferential direction of the stator yoke.

11. A stator, characterized in that: The invention comprises the stator core according to any one of claims 1 to 10.

12. A motor, characterized in that: include: at least one stator according to claim 11; and At least one rotor is provided, and each rotor is arranged corresponding to the stator.

13. The motor according to claim 12, characterized in that The number of the stators is smaller than the number of the rotors, and any one of the stators is disposed between two adjacent rotors; or The number of the stators is greater than the number of the rotors, and any one of the rotors is arranged between two adjacent stators.

14. The motor according to claim 12, characterized in that There are at least two stators, and at least two of the stators have the same number of stator teeth, or at least two of the stators have the same number of phases; or The number of the stators is at least two, and the number of stator teeth of at least two of the stators is different, or the number of phases of at least two of the stators is different.

15. A fan, characterized in that: Comprising the electric machine according to any one of claims 12 to 14.

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