Yoke-free stator tooth, stator core, motor and manufacturing method of yoke-free stator tooth

Abstract

The invention relates to the technical field of motors, and discloses a yoke-free stator tooth, a stator core, a motor and a manufacturing method of the yoke-free stator tooth, the yoke-free stator tooth has a radial direction and an axial direction, and the yoke-free stator tooth comprises a stator tooth core; the two stator tooth shoe sets are arranged at intervals in the axial direction, and each stator tooth shoe set comprises two stator tooth shoes connected to the two sides of the stator tooth center respectively; the stator tooth core comprises a plurality of first tooth sheets with the same size, and the plurality of first tooth sheets are sequentially laminated along the radial direction. According to the yoke-free stator tooth, the stator tooth core is formed by radially laminating the plurality of first tooth sheets with the same size, that is, the sizes and the shapes of all the first tooth sheets are the same, so that the production efficiency is improved, the material waste is reduced, and the material cost is reduced. Standardized raw material plates can be used for the first tooth pieces of the same size, and the material utilization rate is further increased.

Description

Technical Field

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

[0002] The yokeless motor is a motor with high efficiency, lightweight and compact structure. Its main feature is the elimination of the traditional iron core yoke. The magnetic field is usually distributed axially instead of the traditional radial distribution, which makes the magnetic circuit shorter, the magnetic resistance smaller, and the efficiency improved.

[0003] At present, the yokeless stator teeth include a stator tooth core and a stator tooth shoe. The stator tooth shoe is arranged on both sides of the stator tooth core, and the stator tooth core includes multiple silicon steel sheets. However, each silicon steel sheet of the stator tooth core is of different sizes, which makes it difficult to stamp; even if the silicon steel sheets of the stator tooth core can be stamped, because the layout method and material utilization rate of each mold are different, silicon steel sheets of different sizes will produce more waste during the stamping process, making it difficult to achieve the optimal material utilization rate, resulting in material waste. Summary of the invention

[0004] In view of this, the present invention provides a yokeless stator tooth, a stator core, a motor and a method for manufacturing a yokeless stator tooth to solve the problems of greater difficulty in stamping silicon steel sheets of the stator tooth core and low material utilization.

[0005] In a first aspect, the present invention provides a yokeless stator tooth having a radial direction and an axial direction, the yokeless stator tooth comprising:

[0006] Stator tooth center;

[0007] Two stator tooth shoe groups are arranged at intervals along the axial direction, and each of the stator tooth shoe groups includes two stator tooth shoes respectively connected to two sides of the stator tooth core;

[0008] The stator tooth core includes a plurality of first tooth pieces of the same size, and the plurality of first tooth pieces are stacked in sequence along the radial direction.

[0009] The beneficial effects of the above-mentioned yokeless stator teeth are:

[0010] The stator tooth core of the above-mentioned yokeless stator teeth is formed by radially stacking a plurality of first tooth pieces of the same size, that is, the size and shape of all the first tooth pieces are the same, and the first tooth pieces of uniform size can be mass-produced using the same set of molds, which reduces the frequency of mold changes and debugging time, and improves production efficiency. Since all the first tooth pieces have the same size, the sample can be arranged more effectively, reducing material waste and reducing material costs. The first tooth pieces of uniform size can use standardized raw material plates to further improve material utilization.

[0011] In this embodiment, the first tooth piece of the stator tooth core can be quickly processed by stamping, and during the stamping process, the first tooth piece of the stator tooth core can be stamped by only using the same stamping equipment, thereby reducing the stamping cost. The first tooth piece of the stator tooth core can be processed by a simple stamping process, which can significantly reduce production costs and improve production efficiency.

[0012] In an optional embodiment, the two stator tooth shoes in each stator tooth shoe group are equally divided by the same component.

[0013] The above-mentioned yokeless stator teeth, by equally dividing the same component into two stator tooth shoes, can make the entire component more usable, with extremely high material utilization and reduced material waste. The two stator tooth shoes formed by equally dividing the same component have better symmetry, and can be symmetrical about the central axis of the stator tooth center after the two stator tooth shoes are connected to the stator tooth center. Since the two stator tooth shoes in each stator tooth shoe group are processed from the same component, the size and shape of the two stator tooth shoes are more consistent, reducing the error caused by the difference in the stator tooth shoes.

[0014] In an optional embodiment, the stator tooth shoe includes a plurality of second tooth pieces stacked in sequence along the radial direction, and the component includes a plurality of third tooth pieces of the same size and stacked in sequence; the plurality of third tooth pieces are equally divided to form two stator tooth shoes in each stator tooth shoe group.

[0015] The stator tooth shoe is configured as a tooth piece, so that the stator tooth shoe formed by the component being equally divided is also in the form of a tooth piece. The processing technology of the third tooth piece is very simple, and its material utilization rate is also extremely high, which greatly reduces the cost. After subsequent simple processing, a number of second tooth pieces can be obtained.

[0016] In an optional embodiment, two adjacent second tooth pieces have an air gap to increase the equivalent resistance of the stator tooth shoe, reduce eddy current loss, reduce energy loss when the motor is running, and improve the efficiency of the motor.

[0017] In an optional implementation, each of the first tooth plates is processed from a first punching sheet; and each of the third tooth plates is processed from a second punching sheet.

[0018] In an optional embodiment, the first punching sheet is divided into a plurality of first regions sequentially arranged along its extension direction, each of the first regions includes at least two first sub-regions sequentially arranged, and after the first punching sheet is processed, at least two first sub-regions in the first region form at least two first tooth sheets with different structures;

[0019] The second punching sheet is divided into a plurality of second regions sequentially arranged along its extension direction, each of the second regions includes at least two second sub-regions sequentially arranged, and after the second punching sheet is processed, at least two of the second sub-regions in the second region form at least two third tooth sheets with different structures;

[0020] The number of types of the first tooth pieces is the same as the number of types of the third tooth pieces, and each type of the first tooth piece can be matched with a type of the third tooth piece.

[0021] The first punching sheet and the second punching sheet can realize a variety of different structural combinations by dividing the first punching sheet and the second punching sheet into a plurality of regions respectively, and forming a first tooth sheet and a third tooth sheet of different structures in each region, and can form a variety of structures of yokeless stator teeth. It is particularly important that the first punching sheet and the second punching sheet are completely divided into a plurality of regions as a whole, and based on the divided regions, the first punching sheet is processed into a plurality of first tooth sheets, and the second punching sheet is processed into a plurality of third tooth sheets, the first punching sheet and the second punching sheet can be fully utilized, the material utilization rate is extremely high, and there is no waste of any material.

[0022] In an optional embodiment, the stator tooth core and the stator tooth shoe are made of the same material. The same material has the same thermal expansion coefficient, and the thermal stress generated when the temperature changes is small, which helps to maintain the overall structural stability of the yokeless stator teeth.

[0023] On the basis that the material of the stator tooth core and the stator tooth shoe is the same, there is an air gap or an insulating layer between two adjacent second tooth segments in the stator tooth shoe. Even if the first tooth segment and the second tooth segment are not insulated, the second tooth segment in the stator tooth shoe can only be connected to one first tooth segment. The overall equivalent resistance of the stator tooth shoe is very large, so it can reduce the eddy current loss caused by magnetic circuit fluctuations.

[0024] In an optional implementation, the stator tooth center is fixedly connected to the stator tooth shoe.

[0025] In an optional implementation, the stator tooth center is connected to the stator tooth shoe by snap-fitting.

[0026] In an optional embodiment, a groove is provided on the stator tooth core, and a protrusion matching the groove is provided on the stator tooth shoe;

[0027] Alternatively, a protrusion is provided on the stator tooth core, and a groove matching the protrusion is provided on the stator tooth shoe.

[0028] In an optional implementation, the stator tooth center and the stator tooth shoe are connected via a connecting piece.

[0029] In an optional embodiment, limiting grooves are respectively provided on the stator tooth center and the stator tooth shoe, and the connecting member has a first connecting portion and a second connecting portion, the first connecting portion is positioned in the limiting groove of the stator tooth center, and the second connecting portion is positioned in the limiting groove of the stator tooth shoe.

[0030] In an optional implementation, the stator tooth core and the stator tooth shoe are bonded or welded.

[0031] In a second aspect, the present invention further provides a stator core, comprising:

[0032] The plurality of yokeless stator teeth are arranged in a ring shape.

[0033] The beneficial effects of the above-mentioned stator core are the same as the beneficial effects of the above-mentioned yokeless stator teeth, and will not be described in detail here.

[0034] In a third aspect, the present invention further provides a motor, comprising the stator core.

[0035] The beneficial effects of the above motor are the same as those of the above yokeless stator teeth, and will not be described in detail here.

[0036] In a fourth aspect, the present invention further provides a method for manufacturing a yokeless stator tooth, the method being used to manufacture the yokeless stator tooth, comprising the following steps:

[0037] Stacking a plurality of first tooth pieces of the same size in sequence to form a stator tooth core;

[0038] Attach the four stator tooth shoes to the stator tooth core.

[0039] In the above-mentioned method for manufacturing yokeless stator teeth, the stator tooth core is formed by radially stacking a plurality of first tooth pieces of the same size, thereby enabling rapid processing of the first tooth pieces, and using the same set of molds to achieve batch production of the first tooth pieces, thereby improving production efficiency.

[0040] In an optional embodiment, before the step of connecting the four stator tooth shoes to the stator tooth core, the manufacturing method further includes the following steps:

[0041] The two components are divided into two equal parts to form four stator tooth shoes.

[0042] In an optional embodiment, before the step of dividing the two components into two equal parts, the following steps are also included:

[0043] A plurality of third teeth of the same size are stacked in sequence to form the component.

[0044] In an optional embodiment, before the step of sequentially stacking a plurality of first teeth of the same size, the manufacturing method further includes the following steps:

[0045] Processing the first punching sheet into at least two first tooth sheets with different structures in sequence;

[0046] Before the step of sequentially stacking a plurality of third teeth of the same size to form the component, the manufacturing method further comprises the following steps:

[0047] The second punching sheet is sequentially processed into at least two third tooth sheets with different structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0049] Figure 1 A schematic diagram of the structure of a yokeless stator tooth provided by the present invention;

[0050] Figure 2 A schematic structural diagram of a stator tooth core in a yokeless stator tooth provided by the present invention;

[0051] Figure 3 A schematic structural diagram of a first tooth piece in a yokeless stator tooth provided by the present invention;

[0052] Figure 4 A schematic structural diagram of a component in a yokeless stator tooth provided by the present invention;

[0053] Figure 5 A schematic diagram of the structure of a component in a yokeless stator tooth provided by the present invention when being cut;

[0054] Figure 6 A schematic diagram of the structure of a component in a yokeless stator tooth provided by the present invention after cutting;

[0055] Figure 7 A schematic structural diagram of a second tooth piece in a yokeless stator tooth provided by the present invention;

[0056] Figure 8 A plan view of a yokeless stator tooth provided by the present invention;

[0057] Fig. 9 For the present invention Figure 8 A partial enlarged view of part E in FIG.

[0058] Fig.10 A second structural schematic diagram of fixing a stator tooth center and a stator tooth shoe in a yokeless stator tooth provided by the present invention;

[0059] Fig.11 Three structural schematic diagrams of fixing the stator tooth center and the stator tooth shoe in a yokeless stator tooth provided by the present invention;

[0060] Fig.12 A schematic structural diagram of a first punching sheet in a yokeless stator tooth provided by the present invention;

[0061] Fig.13 A schematic structural diagram of a second punching sheet in a yokeless stator tooth provided by the present invention;

[0062] Fig.14 A schematic structural diagram of a connection method of a yokeless stator tooth provided by the present invention;

[0063] Fig.15 A schematic structural diagram of another connection method for a yokeless stator tooth provided by the present invention.

[0064] Description of reference numerals:

[0065] 1. stator tooth center, 11. first tooth plate, 111. first tooth plate a, 112. first tooth plate b, 12. groove, 2. stator tooth shoe, 21. second tooth plate, 22. protrusion, 3. third tooth plate, 31. third tooth plate c, 32. third tooth plate d, 4. first punching plate, 5. second punching plate, 6. connecting part, A. radial direction, B. circumferential direction, C. axial direction. DETAILED DESCRIPTION

[0066] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0067] The yokeless motor is a motor with high efficiency, lightweight and compact structure. Its main feature is the elimination of the traditional iron core yoke. The magnetic field is usually distributed axially instead of the traditional radial distribution, which makes the magnetic circuit shorter, the magnetic resistance smaller, and the efficiency improved.

[0068] At present, the yokeless stator teeth include a stator tooth core and a stator tooth shoe. The stator tooth shoe is arranged on both sides of the stator tooth core, and the stator tooth core includes multiple silicon steel sheets. However, each silicon steel sheet of the stator tooth core is of different sizes, and a special mold needs to be designed and manufactured for each silicon steel sheet. In addition, due to the different sizes of each silicon steel sheet, the mold needs to be frequently replaced during the production process, which makes it difficult to stamp the silicon steel sheets. Silicon steel sheets of different sizes are also prone to dimensional deviations during the stamping process, resulting in unstable quality of the final product.

[0069] Even if silicon steel sheets can be stamped, because the layout and material utilization rate of each mold are different, silicon steel sheets of different sizes will produce more waste during the stamping process, making it difficult to achieve the optimal material utilization rate, resulting in material waste.

[0070] In order to ensure the stamping quality and accuracy of silicon steel sheets of different sizes, high-precision stamping equipment is required, but the cost of these equipment is high, which affects the production cost.

[0071] In the design of conventional axial flux motors, little attention is paid to the cost of axial flux motors. However, with the increasing development of motor technology and the further expansion of the axial flux motor market, its cost has become increasingly important. The cost directly determines the application field, market size, etc.

[0072] Based on this, the present invention provides a yokeless stator tooth, wherein first tooth pieces of the same size are stacked to form a stator tooth core, so that the first tooth pieces can be quickly processed by stamping, and the same set of molds can be used to achieve mass production of the first tooth pieces. Since all the first tooth pieces have the same size, the pattern can be arranged more effectively and material waste can be reduced.

[0073] The present invention solves the cost problem of the stator core in the yokeless axial flux motor, further optimizes the cost, and improves the market competitiveness of this type of motor.

[0074] Combine the following Figures 1 to 15 , the yokeless stator teeth of the first aspect of the present invention and the stator core of the second aspect of the present invention are described in detail.

[0075] According to an embodiment of the present invention, in a first aspect, a yokeless stator tooth is provided, Figure 1 As shown, the yokeless stator teeth have a radial direction A and an axial direction C, and include a stator tooth core 1 and a stator tooth shoe group. There are two stator tooth shoe groups, which are spaced apart in the axial direction. Each stator tooth shoe group includes two stator tooth shoes 2 respectively connected to both sides of the stator tooth core 1, wherein the top end surfaces of the two stator tooth shoes 2 located at the upper part are flush with the top end surfaces of the stator tooth core 1, and the bottom end surfaces of the two stator tooth shoes 2 located at the lower part are flush with the bottom end surfaces of the stator tooth core 1. Figure 2As shown, the stator tooth core 1 includes a plurality of first tooth pieces 11 of the same size, and the plurality of first tooth pieces 11 are stacked in sequence along the radial direction, and the first tooth pieces 11 are arranged along the axial direction.

[0076] It should be noted that “stacking” in this embodiment refers to the process of pressing a plurality of first tooth plates 11 tightly together by pressure to form a whole.

[0077] In this embodiment, the stator tooth core 1 is formed by radially stacking a plurality of first tooth pieces 11 of the same size, that is, the size and shape of all the first tooth pieces 11 are the same, and the first tooth pieces 11 of uniform size can be mass-produced using the same set of molds, which reduces the frequency of mold changes and debugging time, and improves production efficiency. Since all the first tooth pieces 11 have the same size, the sample can be arranged more effectively, reducing material waste and reducing material costs. The first tooth pieces 11 of uniform size can use standardized raw material plates (first punching pieces 4), further improving material utilization.

[0078] The first tooth piece 11 of the stator tooth core of this embodiment can be quickly processed by stamping, and during the stamping process, only the same stamping equipment is used to stamp the first tooth piece 11, thereby reducing the stamping cost. The first tooth piece 11 of the stator tooth core can be processed by a simple stamping process, which can significantly reduce production costs and improve production efficiency.

[0079] In some embodiments, in combination Figures 4 to 6 As shown, the two stator tooth shoes 2 in each stator tooth shoe group are formed by equally dividing the same component, wherein the component is a component with a simple initial structure.

[0080] In this embodiment, firstly, by equally dividing the same component into two stator tooth shoes 2, the entire component can be utilized, the material utilization rate is extremely high, and material waste is reduced. Secondly, the two stator tooth shoes 2 equally divided into the same component have better symmetry, and after the two stator tooth shoes 2 are connected to the stator tooth core 1, they can be symmetrical about the central axis of the stator tooth core 1. Since the two stator tooth shoes 2 in each stator tooth shoe group are processed from the same component, the size and shape of the two stator tooth shoes are more consistent, reducing the error caused by the difference in the stator tooth shoes.

[0081] In some embodiments, the stator tooth shoe 2 includes a plurality of second tooth pieces 21 stacked in sequence along the radial direction, and the component includes a plurality of third tooth pieces 3 of the same size and stacked in sequence. The plurality of third tooth pieces 3 are equally divided to form two stator tooth shoes 2 in each stator tooth shoe group.

[0082] In this embodiment, the component is set in the form of a tooth piece, so that the stator tooth shoe formed by the component after being equally divided is also in the form of a tooth piece. The processing technology of the third tooth piece 3 is very simple, and its material utilization rate is also very high, which greatly reduces the cost. After subsequent simple processing, a plurality of second tooth pieces 21 can be obtained.

[0083] By stacking a plurality of third tooth pieces 3 to form a component and then equally dividing them to form stator tooth shoes, it is possible to ensure that the size and shape of each second tooth piece 21 are highly consistent with the set requirements, thereby improving the overall manufacturing accuracy. The size of each third tooth piece 3 is also consistent in the stacking direction, so that the third tooth piece 3 can be quickly processed.

[0084] If the stator tooth shoe 2 is an integral structure, the stator tooth shoe 2 has a relatively small overall resistance during actual operation. Based on the calculation formula of eddy current loss power P=U 2 / R, when the overall resistance R of the stator tooth shoe 2 is small, its eddy current loss is large, resulting in increased energy loss when the motor is running.

[0085] In order to solve the above problems, in some embodiments, a plurality of second tooth pieces 21 stacked in sequence along the radial direction constitute a stator tooth shoe 2, and two adjacent second tooth pieces 21 have an air gap or an insulating layer to increase the equivalent resistance of the stator tooth shoe 2. When the overall resistance of the stator tooth shoe 2 increases, the eddy current loss of the stator tooth shoe 2 can be effectively reduced, and the energy loss during motor operation is reduced, thereby improving the efficiency of the motor. In addition, the air gap between two adjacent second tooth pieces 21 can also increase air circulation, further improving the heat dissipation effect of the motor. After the eddy current loss is reduced, the heat generated inside the motor will also be reduced accordingly, which will help improve the heat dissipation performance of the motor and extend the service life of the motor.

[0086] In some embodiments, each first tooth piece 11 is processed by a first punching sheet 4. Each third tooth piece 3 is processed by a second punching sheet 5. It should be noted that the "processing" in this embodiment can be a stamping process or a cutting process, wherein the cutting process can be a laser cutting process.

[0087] The first punching sheet 4 is divided into a plurality of first regions sequentially arranged along its extension direction, each first region includes at least two first sub-regions sequentially arranged, and after the first punching sheet 4 is processed, at least two first sub-regions in the first region form at least two first tooth sheets 11 with different structures.

[0088] The second punching sheet 5 is divided into a plurality of second regions sequentially arranged along its extension direction, each second region includes at least two second sub-regions sequentially arranged, and after the second punching sheet 5 is processed, at least two second sub-regions in the second region form at least two third tooth sheets 3 with different structures.

[0089] The number of types of the first gear pieces 11 is the same as the number of types of the third gear pieces 3 , and each type of the first gear piece 11 can be matched with a type of the third gear piece 3 .

[0090] In this embodiment, by dividing the first punching sheet 4 and the second punching sheet 5 into a plurality of regions, and forming the first tooth sheet 11 and the third tooth sheet 3 of different structures in each region, a variety of different structural combinations can be achieved, and a variety of structures of yokeless stator teeth can be formed. It is particularly important that the first punching sheet 4 and the second punching sheet 5 are completely divided into a plurality of regions as a whole, and based on the divided regions, the first punching sheet 4 is processed into a plurality of first tooth sheets 11, and the second punching sheet 5 is processed into a plurality of third tooth sheets 3, the first punching sheet 4 and the second punching sheet 5 can be fully utilized, the material utilization rate is extremely high, and there is no waste of any material.

[0091] As a preferred embodiment, Figures 12 to 15 For example, the first punch 4 is divided into two first sub-regions that are alternately connected in sequence. The two first sub-regions are respectively a first tooth plate a region and a first tooth plate b region. The first punch 4 located in the first tooth plate a region is punched to form a first tooth plate a 111, and the first punch 4 located in the first tooth plate b region is punched to form a first tooth plate b 112. The second punch 5 is divided into a third tooth plate c region and a third tooth plate d region that are alternately connected in sequence. The second punch 5 located in the third tooth plate c region is punched to form a third tooth plate c 31, and the second punch 5 located in the third tooth plate d region is punched to form a third tooth plate d 32. Fig.14 As shown, the first tooth piece a 111 cooperates with the third tooth piece d 32, and the first tooth piece b 112 cooperates with the third tooth piece c 31, so as to form a first yokeless stator tooth structure. Fig.15 As shown, the first tooth piece b 112 cooperates with the third tooth piece c 31 to form a second yokeless stator tooth structure.

[0092] At present, the stator tooth core 1 and stator tooth shoe 2 of the yokeless stator tooth are usually made of two different materials (such as silicon steel sheet material and soft magnetic composite material), which has some potential risks: 1) Different materials have different thermal expansion coefficients, and the deformation of the two materials is inconsistent when the temperature changes, resulting in assembly errors between the two materials. In addition, the differences in physical and chemical properties between different materials increase the difficulty of welding, bonding and other processes. 2) When the magnetic field fluctuates, magnetism will be generated, and the generated current will be transmitted along the axial direction of the silicon steel sheet. In theory, the silicon steel sheet will be partially conducted by the soft magnetic composite material. If no special insulation treatment is performed, the soft magnetic composite material will connect the circuits on each silicon steel sheet. Based on the calculation formula of eddy current loss power P=U 2 / R, the overall resistance of the soft magnetic composite material is small, resulting in large eddy current losses. Therefore, the design of yokeless stator teeth cannot only focus on output torque, performance, efficiency and comprehensive cost are also important considerations.

[0093] In order to solve the above problems, in some embodiments, the stator tooth core 1 and the stator tooth shoe 2 are made of the same material, and the first tooth piece 11 of the stator tooth core 1 and the second tooth piece 21 of the stator tooth shoe 2 are both silicon steel sheets. The same material has the same thermal expansion coefficient, and the thermal stress generated when the temperature changes is small, which helps to maintain the overall structural stability of the yokeless stator teeth. Using the same material can ensure the consistency of the size, shape and performance of the stator tooth core 1 and the stator tooth shoe 2, and reduce the manufacturing errors caused by material differences. The same materials are easier to align and fix during the assembly process, reducing assembly errors and improving assembly quality.

[0094] Each first tooth piece 11 in the stator tooth core 1 is respectively connected to a second tooth piece 21 in the stator tooth shoe 2. It should be noted that the connection between the first tooth piece 11 and the second tooth piece 21 can be an insulating connection or a non-insulating connection. When the first tooth piece 11 and the second tooth piece 21 are insulated, an insulating coating can be arranged between the first tooth piece 11 and the second tooth piece 21.

[0095] On the basis that the material of the stator tooth core 1 and the stator tooth shoe 2 is the same, there is an air gap or an insulating layer between two adjacent second tooth pieces 21 in the stator tooth shoe 2. Even if the first tooth piece 11 and the second tooth piece 21 are not insulated, the second tooth piece 21 in the stator tooth shoe 2 can only be connected to one first tooth piece 11. The overall equivalent resistance of the stator tooth shoe 2 is very large, so the eddy current loss caused by magnetic circuit fluctuations can be reduced.

[0096] In some embodiments, the stator tooth core 1 is fixedly connected to the stator tooth shoe 2, and the fixed connection method includes snap-fit ​​connection, bonding, welding, connection with a connector, etc., but is not limited to the above connection methods, and other connection methods can also be used, which is very flexible in the matching method. Since the installation position of the stator tooth core 1 and the stator tooth shoe 2 is fully considered in the design of this embodiment, the axial size of the yokeless stator tooth formed is not significantly increased.

[0097] As a specific embodiment, the stator tooth core 1 is connected to the stator tooth shoe 2 by snap-fitting. Fig. 9 As shown, a groove 12 is provided on the stator tooth core 1, and a protrusion 22 matching the groove 12 is provided on the stator tooth shoe 2. As a replaceable embodiment, a protrusion is provided on the stator tooth core 1, and a groove matching the protrusion is provided on the stator tooth shoe 2. The groove may be a dovetail groove, and the protrusion may be a dovetail protrusion. The groove and the protrusion may also be in other shapes, and their specific shapes are not limited here.

[0098] As an alternative embodiment, in combination Fig.10 As shown, the connection surfaces of the stator tooth core 1 and the stator tooth shoe 2 are both set as planes, and the stator tooth core 1 and the stator tooth shoe 2 are bonded or welded. Since the connection surfaces of the stator tooth core 1 and the stator tooth shoe 2 in this embodiment are both set as planes, when the first punching sheet 4 is used to divide the first area, the first punching sheet 4 can be directly divided into a plurality of identical first sub-areas as a whole, and when the second punching sheet 5 is used to divide the second area, the second punching sheet 5 can be directly divided into a plurality of identical second sub-areas as a whole. Preferably, the first sub-area is a rectangular area, the second sub-area is a rectangular area, the first tooth piece 11 formed after the first sub-area is processed is rectangular, and the third tooth piece 3 formed after the second sub-area is processed is rectangular.

[0099] As an alternative embodiment, in combination Fig.11 As shown, the stator tooth core 1 and the stator tooth shoe 2 are connected by a connector 6. The stator tooth core 1 and the stator tooth shoe 2 are respectively provided with limiting grooves. More specifically, the first sub-region is a rectangular region with four limiting grooves, and the second sub-region is a rectangular region with four limiting grooves, so that the first tooth piece 11 and the second tooth piece 21 are provided with limiting grooves after processing. The connector 6 has a first connecting portion and a second connecting portion, the first connecting portion is positioned in the limiting groove of the stator tooth core 1, and the second connecting portion is positioned in the limiting groove of the stator tooth shoe 2, and then the connection and positioning of the stator tooth core 1 and the stator tooth shoe 2 can be realized by the connector 6.

[0100] Preferably, when the limiting groove of the first tooth piece 11 is connected with the limiting groove of the second tooth piece 21, the first tooth piece 11 and the second tooth piece 21 are provided with dovetail grooves of multiple angles between the limiting grooves, and when the connecting member 6 is inserted into the dovetail grooves of multiple angles, the displacement of each structure in multiple directions can be limited. The connecting member 6 is a connecting pin, and the first connecting portion and the second connecting portion of the connecting pin are adapted to the dovetail grooves of multiple angles.

[0101] The stator tooth core 1 and the stator tooth shoe 2 are connected in a very firm manner, and can have certain application prospects in occasions with large magnetic pulling force or severe working conditions, thereby ensuring structural strength.

[0102] According to an embodiment of the present invention, in a second aspect, a stator core is provided, which is a yokeless disc motor stator core with extremely high material utilization, comprising a plurality of yokeless stator teeth, wherein the plurality of yokeless stator teeth are arranged in a ring shape along a circumferential direction B.

[0103] According to an embodiment of the present invention, in a third aspect, a motor is provided, comprising a stator core. The motor in this embodiment is an axial flux motor (also called a disc motor).

[0104] According to an embodiment of the present invention, in a fourth aspect, a method for manufacturing a yokeless stator tooth is provided. The method is used to manufacture a yokeless stator tooth, comprising the following steps:

[0105] A plurality of first tooth pieces 11 of the same size are stacked in sequence to form a stator tooth core 1 .

[0106] Four stator tooth shoes 2 are connected to the stator tooth core 1 .

[0107] In the above-mentioned method for manufacturing yokeless stator teeth, the stator tooth core 1 is formed by radially stacking a plurality of first tooth pieces 11 of the same size, thereby enabling rapid processing of the first tooth pieces 11 and using the same set of molds to achieve mass production of the first tooth pieces 11, thereby improving production efficiency.

[0108] In some embodiments, before the step of connecting the four stator tooth shoes 2 to the stator tooth core 1, the manufacturing method further includes the following steps:

[0109] The two components are divided into two equal parts to form four stator tooth shoes 2.

[0110] In this embodiment, combined with Figure 5 As shown, when a component is divided into equal parts, a cutting line is preset on the component, and the cutting line is an oblique line; Figure 6 As shown, the component is cut into two stator tooth shoes 2 according to the cutting line, and the two stator tooth shoes 2 are symmetrical to each other; Figure 8 As shown, the side of the two stator tooth shoes 2 after cutting away from the cutting position is assembled to the bottom of the stator tooth core 1, and then the side of the other two stator tooth shoes 2 after cutting away from the cutting position is assembled to the top of the stator tooth core 1 to form a yokeless stator tooth.

[0111] In this embodiment, the component is equally divided into two stator tooth shoes 2. On the one hand, the component material can be fully utilized, and on the other hand, the production of the stator tooth shoes 2 is very convenient and the production speed can be accelerated.

[0112] In some embodiments, before the step of dividing the two components into two equal parts, the following steps are also included:

[0113] A plurality of third tooth plates 3 of the same size are stacked in sequence to form a component.

[0114] In this embodiment, the production of the third tooth piece 3 is very simple. The production of the component only requires stacking the third tooth piece 3 in sequence. The production of the component is also very simple, and the production of the stator tooth shoe 2 only requires cutting the component into equal parts, which makes the production of the stator tooth shoe 2 very simple.

[0115] In some embodiments, before the step of sequentially stacking a plurality of first teeth 11 of the same size, the manufacturing method further includes the following steps:

[0116] The front and back surfaces of the first punching sheet 4 are insulated.

[0117] The first punching sheet 4 is processed into at least two first tooth sheets 11 with different structures in sequence. More specifically, the entire area of ​​the first punching sheet 4 is divided into a plurality of first areas of the same size, each first area is divided into at least two first sub-areas of different structures that are sequentially spliced, the first sub-areas are punched, and the first tooth sheets 11 of the same size are grouped. The first tooth sheets 11 of the same group are then stacked to form the stator tooth core 1.

[0118] Before the step of sequentially stacking a plurality of third teeth of the same size to form a component, the manufacturing method further includes the following steps:

[0119] The front and back surfaces of the second punching sheet 5 are insulated.

[0120] The second punching sheet 5 is processed into at least two third tooth pieces 3 with different structures in sequence. More specifically, the entire area of ​​the second punching sheet 5 is divided into a plurality of second areas of the same size, the second area is divided into at least two second sub-areas of different structures and sequentially spliced, and each second sub-area can be matched with one of the first sub-areas, the second sub-areas are punched to form the third tooth piece 3, and the third tooth pieces 3 of the same size are grouped. The third tooth pieces 3 of the same group are then stacked to form a component.

[0121] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A yokeless stator tooth having a radial direction and an axial direction, the yokeless stator tooth comprising: Stator tooth center (1); Two stator tooth shoe groups are arranged at intervals along the axial direction, each of the stator tooth shoe groups comprising two stator tooth shoes (2) respectively connected to two sides of the stator tooth center (1); It is characterized in that the stator tooth core (1) comprises a plurality of first tooth pieces (11) of the same size, and the plurality of first tooth pieces (11) are stacked in sequence along the radial direction.

2. The yokeless stator tooth according to claim 1, characterized in that: The two stator tooth shoes (2) in each stator tooth shoe group are equally divided by the same component.

3. The yokeless stator tooth according to claim 2, characterized in that: The stator tooth shoe (2) comprises a plurality of second tooth pieces (21) stacked in sequence along the radial direction, and the component comprises a plurality of third tooth pieces (3) of the same size and stacked in sequence; the plurality of third tooth pieces (3) are equally divided to form two stator tooth shoes (2) in each stator tooth shoe group.

4. The yokeless stator tooth according to claim 3, characterized in that: Two adjacent second tooth pieces (21) have an air gap or an insulating layer to increase the equivalent resistance of the stator tooth shoe (2) and reduce eddy current loss.

5. The yokeless stator tooth according to claim 3, characterized in that: Each of the first tooth pieces (11) is processed from a first punching piece (4); and each of the third tooth pieces (3) is processed from a second punching piece (5).

6. The yokeless stator tooth according to claim 5, characterized in that: The first punching sheet (4) is divided into a plurality of first regions sequentially arranged along its extension direction, each of the first regions comprises at least two first sub-regions sequentially arranged, and after the first punching sheet (4) is processed, at least two first sub-regions in the first region form at least two first tooth sheets (11) with different structures; The second punching plate (5) is divided into a plurality of second regions sequentially arranged along its extension direction, each second region comprises at least two second sub-regions sequentially arranged, and after the second punching plate (5) is processed, at least two second sub-regions in the second region form at least two third tooth plates (3) with different structures; The number of types of the first tooth pieces (11) is the same as the number of types of the third tooth pieces (3), and each type of the first tooth piece (11) can correspond to one type of the third tooth piece (3).

7. The yokeless stator tooth according to any one of claims 1 to 6, characterized in that: The stator tooth core (1) and the stator tooth shoe (2) are made of the same material.

8. The yokeless stator tooth according to any one of claims 1 to 6, characterized in that: The stator tooth core (1) is fixedly connected to the stator tooth shoe (2).

9. The yokeless stator tooth according to claim 8, characterized in that: The stator tooth core (1) is connected to the stator tooth shoe (2) by snap-fitting.

10. The yokeless stator tooth according to claim 9, characterized in that: The stator tooth core (1) is provided with a groove, and the stator tooth shoe (2) is provided with a protrusion matched with the groove; Alternatively, a protrusion is provided on the stator tooth core (1), and a groove matching the protrusion is provided on the stator tooth shoe (2).

11. The yokeless stator tooth according to claim 8, characterized in that: The stator tooth core (1) and the stator tooth shoe (2) are connected via a connecting piece (6).

12. The yokeless stator tooth according to claim 11, characterized in that: The stator tooth center (1) and the stator tooth shoe (2) are respectively provided with corresponding limiting grooves, and the connecting member (6) has a first connecting portion and a second connecting portion, the first connecting portion is positioned in the limiting groove of the stator tooth center (1), and the second connecting portion is positioned in the limiting groove of the stator tooth shoe (2).

13. The yokeless stator tooth according to claim 8, characterized in that: The stator tooth core (1) and the stator tooth shoe (2) are bonded or welded.

14. A stator core, characterized in that: include: A plurality of yokeless stator teeth according to any one of claims 1 to 13, wherein the plurality of yokeless stator teeth are arranged in a ring shape.

15. A motor, characterized in that: It comprises the stator core as claimed in claim 14.

16. A method for manufacturing a yokeless stator tooth, characterized in that: The method is used to manufacture the yokeless stator teeth according to claim 1, comprising the following steps: Stacking a plurality of first tooth pieces (11) of the same size in sequence to form a stator tooth core (1); Connect the four stator tooth shoes (2) to the stator tooth core (1).

17. The method for manufacturing a yokeless stator tooth according to claim 16, characterized in that: Before the step of connecting the four stator tooth shoes (2) to the stator tooth core (1), the manufacturing method further comprises the following steps: The two components are divided into two equal parts to form four stator tooth shoes (2).

18. The method for manufacturing a yokeless stator tooth according to claim 17, characterized in that: Before the step of dividing the two components into two equal parts, the following steps are also included: A plurality of third teeth of the same size are stacked in sequence to form the component.

19. The method for manufacturing a yokeless stator tooth according to claim 18, characterized in that: Before the step of sequentially stacking a plurality of first teeth (11) of the same size, the manufacturing method further comprises the following steps: Processing the first punching sheet (4) in sequence into at least two first tooth sheets (11) with different structures; Before the step of sequentially stacking a plurality of third teeth of the same size to form the component, the manufacturing method further comprises the following steps: The second punching sheet (5) is sequentially processed into at least two third tooth sheets (3) with different structures.

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