Stator structure and axial flux permanent magnet motor

Abstract

The present invention discloses a stator structure and an axial flux permanent magnet motor. The stator structure for the axial flux permanent magnet motor comprises a yoke structure and a plurality of tooth structures. The plurality of tooth structures are connected to the yoke structure. A tooth slot is formed between two adjacent tooth structures. A slot structure is axially arranged in the middle position of each tooth structure. The slot structure does not penetrate the tooth structure or penetrates the tooth structure and the yoke structure in the axial direction. When the slot structure does not penetrate the tooth structure in the axial direction, the end of the slot structure opposite to the yoke structure in the axial direction is spaced from the top of the tooth structure. When the slot structure penetrates the tooth structure and the yoke structure in the axial direction, the stator structure is divided into a plurality of first block cores. The first block cores are formed by radial laminations. The plurality of first block cores are spliced ​​together to form the stator structure.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a stator structure and an axial flux permanent magnet motor. Background Art

[0002] Axial flux permanent magnet motor is a new type of motor, also known as diameter flux motor, which is a permanent magnet synchronous motor with the axial flux direction of the inner and outer rotors perpendicular to the rotation axis. The inner and outer rotors of the axial flux motor are composed of several superimposed cores and coils, and work in a flux channel with high flux density.

[0003] However, the stator core of the axial flux permanent magnet motor is made of wound silicon steel sheets, which will cause the silicon steel sheets to be constantly subjected to bending stress, causing the performance of the silicon steel sheets to deteriorate.

[0004] The above contents are only used to assist in understanding the technical solution of the present invention and do not constitute an admission that the above contents are prior art. Summary of the invention

[0005] The main purpose of the present invention is to provide a stator structure and an axial flux permanent magnet motor, aiming to solve the problem that the stator core of the prior art axial flux permanent magnet motor is made of wound silicon steel sheets, and the winding will cause the silicon steel sheets to be constantly subjected to bending stress, which will cause the performance of the silicon steel sheets to deteriorate.

[0006] To achieve the above object, the present invention provides a stator structure for an axial flux permanent magnet motor, the stator structure for an axial flux permanent magnet motor comprising:

[0007] Yoke structure;

[0008] A plurality of tooth structures are connected to the yoke structure, a tooth groove is formed between two adjacent tooth structures, a slot structure is axially provided at the middle position of each tooth structure, and the slot structure does not penetrate the tooth structure or penetrates the tooth structure and the yoke structure in the axial direction;

[0009] Wherein, when the slit structure does not penetrate the tooth structure in the axial direction, the end of the slit structure opposite to the yoke structure in the axial direction is spaced from the top of the tooth structure;

[0010] When the slit structure axially penetrates the tooth structure and the yoke structure, the stator structure is divided into a plurality of first segmented cores, wherein the first segmented cores are formed by radial laminations, and a plurality of first segmented cores are spliced ​​together to form the stator structure.

[0011] Preferably, in the stator structure for the axial flux permanent magnet motor, when the slit structure does not penetrate the tooth structure in the axial direction, the other end of the slit structure extends in the axial direction toward the yoke structure and does not exceed the bottom of the tooth slot, and the interval between the slit structure and the top of the tooth structure is L, L ≥ 2 mm;

[0012] And / or, the width of the slit structure along the circumferential direction is H, 0.2mm≤H≤0.5mm.

[0013] Preferably, in the stator structure for the axial flux permanent magnet motor, when the slot structure penetrates the tooth structure and the yoke structure in the axial direction, two adjacent first segmented cores are positioned together at the yoke structure by a positioning structure;

[0014] Two adjacent first segmented cores are spliced ​​to form a splicing gap, and the width of the splicing gap is A, where A≤0.2 mm.

[0015] Preferably, in the stator structure for the axial flux permanent magnet motor, each first segmented iron core is provided with a first matching structure on one side of the slot structure located at the yoke structure, and a first concave-convex structure on the other side; during installation, the first matching structure of two adjacent first segmented iron cores is plugged together with the other first concave-convex structure.

[0016] Preferably, in the stator structure for the axial flux permanent magnet motor, each first segmented iron core is provided with a recessed structure on both sides of the slotted structure at the yoke structure, and after two adjacent first segmented iron cores are spliced ​​together, the recessed structures of the two adjacent first segmented iron cores form a cylindrical space;

[0017] A magnetic conductive metal piece is installed in the cylindrical space, and two ends of the magnetic conductive metal piece extend out of the cylindrical space respectively, and are used to extend to grooves inside and outside the housing of the axial flux permanent magnet motor respectively;

[0018] After the magnetic conductive metal part is installed, it is fixed by potting glue.

[0019] Preferably, in the stator structure for the axial flux permanent magnet motor, each first segmented core comprises a plurality of silicon steel sheets stacked in radial direction.

[0020] Preferably, in the stator structure for the axial flux permanent magnet motor, when the slit structure does not penetrate the tooth structure in the axial direction, the slit structure includes a first section and a second section, the first section is extended from the bottom of the tooth slot along the circumferential direction to the middle position of the tooth structure, the second section is connected to the first section, and the second section is extended from the end of the first section toward the bottom of the yoke structure, and the second section passes through the middle position of the tooth structure at the yoke structure axially below;

[0021] The slotted structure divides the stator structure into a plurality of second segmented iron cores, and the plurality of second segmented iron cores are spliced ​​together.

[0022] Preferably, in the stator structure for the axial flux permanent magnet motor, each second segmented iron core is provided with a second matching structure on one side of the second section and a second concave-convex structure on the other side, and during installation, the second matching structures of two adjacent second segmented iron cores are plugged together with the second concave-convex structure of the other one;

[0023] The joint between the second matching structure and the second concave-convex structure is located in a low magnetic density area.

[0024] Preferably, the axial thickness of the yoke structure of the second segmented core does not exceed the width of the tooth structure of the second segmented core; or,

[0025] The second matching structure and the second concave-convex structure are located on a surface parallel to the axial direction.

[0026] In order to achieve the above object, the present invention further provides an axial flux permanent magnet motor, which includes the above stator structure for the axial flux permanent magnet motor.

[0027] The present invention has at least the following beneficial effects:

[0028] The present invention provides a stator structure for an axial flux permanent magnet motor, wherein a plurality of tooth structures are connected to the yoke structure, a tooth slot is formed between two adjacent tooth structures, and a slot structure is axially provided at the middle position of each tooth structure, wherein the slot structure does not penetrate the tooth structure axially or penetrates the tooth structure and the yoke structure; wherein when the slot structure does not penetrate the tooth structure axially, the end of the slot structure opposite to the yoke structure axially is spaced from the top of the tooth structure; when the slot structure penetrates the tooth structure and the yoke structure axially, the stator structure is divided into a plurality of first segmented cores, wherein the first segmented cores are formed by radial laminations, and a plurality of first segmented cores are spliced ​​together to form the stator structure, thereby solving the problem that the stator core of the prior art axial flux permanent magnet motor is made of wound silicon steel sheets, and the winding causes the silicon steel sheets to be constantly subjected to bending stress, which causes the performance of the silicon steel sheets to deteriorate.

[0029] Furthermore, providing a slotted structure in the middle of the tooth structure along the magnetic circuit direction has little effect on the motor performance. The slotted structure can help to further reduce the eddy current circuit in the tooth structure laminations and can further reduce the eddy current loss of the core. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic diagram of a conventional stator structure in the prior art;

[0031] Figure 2 is a schematic diagram of the motor magnetic circuit;

[0032] Figure 3 It is a schematic diagram of a first embodiment of the stator structure of an axial flux permanent magnet motor of the present invention;

[0033] Figure 4 It is a schematic diagram of a second embodiment of the stator structure of the axial flux permanent magnet motor of the present invention;

[0034] Figure 5 is a schematic diagram of radial lamination;

[0035] Figure 6 A schematic diagram of a first segmented core according to an embodiment of the present invention;

[0036] Figure 7 for Figure 6 Schematic diagram from another perspective;

[0037] Figure 8 is a schematic diagram of another embodiment of the first segmented core of the present invention;

[0038] Fig. 9 for Figure 8 A schematic diagram of the first segmented core when being installed in the housing;

[0039] Fig.10 for Fig. 9 Schematic diagram of the decomposition of

[0040] Fig.11 for Fig. 9 Schematic diagram of the middle shell;

[0041] Fig.12 It is a schematic diagram of a third embodiment of a stator structure for an axial flux permanent magnet motor according to the present invention;

[0042] Fig.13 for Fig.12 Schematic diagram of the second block core;

[0043] Fig.14 for Fig.13 Schematic diagram from another perspective;

[0044] Fig.15 for Fig.13 Schematic diagram from another perspective;

[0045] Fig.16 for Fig.13 Schematic diagram of the second block core being inserted into the coil;

[0046] Fig.17 for Fig.12 Schematic diagram from another perspective;

[0047] Fig.18 It is a schematic diagram of a fourth embodiment of the stator structure for an axial flux permanent magnet motor according to the present invention.

[0048] Reference numerals of the prior art:

[0049] Label name Label name 100’ Stator structure for axial flux permanent magnet motor

[0050] Reference numerals of the present invention:

[0051] Label name Label name 100 Stator structure for axial flux permanent magnet motor 43 Concave structure 1 Yoke structure 44 Paragraph 1 11 Low magnetic density area 45 Paragraph 2 12 Mounting slot 451 The second concavoconvex structure 2 Tooth structure 452 The second matching structure 3 Tooth groove 51 The first block core 4 Opening structure 52 The second segment core 41 The first concavoconvex structure 53 The third block 42 The first matching structure 6 Magnetic metal parts 421 Stop 200 case

[0052] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments. DETAILED DESCRIPTION

[0053] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0054] In the embodiments of the present invention, the term "and / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent three situations: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0055] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0056] In the embodiments of the present invention, the term "plurality" refers to two or more than two, and other quantifiers are similar.

[0057] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0058] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. However, it can be understood by those skilled in the art that in the embodiments of the present invention, many technical details are proposed in order to enable readers to better understand the present invention. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed in the present invention can also be implemented. The division of the following embodiments is for the convenience of description and should not constitute any limitation on the specific implementation of the present invention. The various embodiments can be combined and referenced with each other under the premise of no contradiction.

[0059] The present invention provides a stator structure for an axial flux permanent magnet motor. Figure 3 As shown, the stator structure 100 for the axial flux permanent magnet motor includes a yoke structure 1 and a plurality of tooth structures 2, wherein the plurality of tooth structures 2 are connected to the yoke structure 1, and a tooth slot 3 is formed between two adjacent tooth structures 2, and a slot structure 4 is axially provided at the middle position of each tooth structure 2, and the slot structure 4 does not penetrate the tooth structure 2 or penetrates the tooth structure 2 and the yoke structure 1 in the axial direction.

[0060] It should be noted that the middle position of the tooth structure 2 in the present invention refers to the position of the center line of each tooth structure 2 , which extends in the axial direction, rather than the approximate middle position of each tooth structure 2 .

[0061] Figure 1 Schematically shows a conventional stator structure 100' in the prior art. Figure 1 The conventional stator structure 100 ′ is formed by winding silicon steel sheets. The winding causes the silicon steel sheets to be subjected to bending stress all the time, which may cause the performance of the silicon steel sheets to deteriorate.

[0062] The present invention solves the problem that the stator core of the prior art axial flux permanent magnet motor is made of wound silicon steel sheets by providing the slotted structure 4, and the winding causes the silicon steel sheets to be constantly subjected to bending stress, which causes the performance of the silicon steel sheets to deteriorate. Figure 2 A schematic diagram of the motor magnetic circuit is shown. Figure 2 , the magnetic circuit will separate toward the two sides of the yoke at the bottom of the tooth, so setting the slot structure 4 in the middle position of the tooth structure 2 along the magnetic circuit direction has little effect on the motor performance. Furthermore, the slot structure 4 can help to further reduce the eddy current circuit in the laminations of the tooth structure 2, and can further reduce the eddy current loss of the core. In addition, the slot structure 4 is easy to process, just like a conventional wound core, and only the punch die needs to be changed.

[0063] Figure 3 Schematic diagram of a first embodiment of a stator structure 100 of an axial flux permanent magnet motor of the present invention is shown. Figure 3 , Figure 3 The middle slot structure 4 does not penetrate the tooth structure 2 in the axial direction, and the slot structure 4 is spaced apart from the top of the tooth structure 2 at the end opposite to the yoke structure 1 in the axial direction. It is worth emphasizing that the slot structure 4 needs to be arranged in the middle position of the tooth structure 2, so as not to affect the magnetic circuit of the motor and the magnetic performance of the motor.

[0064] In addition, since the stator structure 100 is usually wound by silicon steel sheets, during the winding process, the silicon steel sheets are pulled and the silicon steel sheets are subjected to force, so the slit structure 4 cannot extend axially to the top of the tooth structure 2, otherwise when the silicon steel sheets are subjected to force, the force on the yoke structure 1 increases, and the top of the tooth structure 2 will be broken due to being too thin. Specifically, the interval between the slit structure 4 and the top of the tooth structure 2 is L, and L ≥ 2mm. The specific setting value of L needs to be considered in combination with electromagnetic simulation and process, and it is necessary to avoid the situation in which the yoke structure 1 is subjected to increased force and the silicon steel sheets are broken when the silicon steel sheets are pulled during the winding process.

[0065] The other end of the slot structure 4 extends axially toward the direction close to the yoke structure 1, and the extension length cannot be too long, which will affect the overall strength, and too short an extension length will not achieve the desired effect. In this embodiment, the other end of the slot structure 4 extends axially toward the direction close to the yoke structure 1 and does not exceed the bottom of the tooth groove 3.

[0066] The circumferential width of the slot structure 4 is H. If H is too small, it will be limited by punches and other processing tools and cannot be processed; if H is too large, it will cause a large part of the tooth structure 2 to be empty, which will affect the performance and strength of the motor. Therefore, in this embodiment, 0.2mm≤H≤0.5mm. Of course, without considering the limitations of punches and other processing tools, the smaller H is, the better.

[0067] Figure 4 A schematic diagram of a second embodiment of a stator structure 100 of an axial flux permanent magnet motor of the present invention is shown. Figure 5 A schematic diagram of the radial laminations is shown. Figure 4 and Figure 5 , Figure 4 The middle slot structure 4 axially penetrates the tooth structure 2 and the yoke structure 1, and divides the stator structure 100 into a plurality of first segmented cores 51, wherein the first segmented cores 51 are formed by radial laminations, and a plurality of first segmented cores 51 are spliced ​​together to form the stator structure 100. Specifically, each first segmented core 51 includes a plurality of silicon steel sheets formed by radial laminations.

[0068] It is worth noting that conventional wound cores will cause the silicon steel sheets to be constantly subjected to bending stress, which can lead to deterioration of the performance of the silicon steel sheets and increase iron loss. In this embodiment of the present invention, the core formed by winding the original silicon steel sheets is divided into blocks, and the first divided core 51 is formed by radial laminations, which can reduce the influence of the stress.

[0069] Furthermore, the present invention provides a block core. Compared with a normal core, the block core can have a variety of shapes, such as U-shaped, Z-shaped or other special-shaped structures, which is more flexible and simpler to process.

[0070] It is worth noting that the boundary of the single first segmented core 51 is located in the middle of the tooth structure 2, which has the least impact on the motor performance. When installing, after the multiple first segmented cores 51 are spliced ​​together to form a whole, the whole can be dipped in paint, or the spliced ​​parts can be welded to form a whole.

[0071] Each first segmented core 51 may be, but is not limited to, a radially laminated structure formed by riveting, gluing or high-temperature curing of self-adhesive silicon steel sheets.

[0072] Two adjacent first segmented cores 51 are positioned together at the yoke structure 1 by a positioning structure. This can play a role in splicing positioning. Specifically, the positioning structure can be a concave-convex structure for plug-in matching, or a concave structure 43 at the splicing point with a magnetic conductive metal part 6 arranged in the middle, which can be specifically arranged according to actual needs. The following will describe these two positioning structures in detail.

[0073] Figure 6 FIG. 1 is a schematic diagram showing an embodiment of a positioning structure. Figure 6 Each first segmented core 51 is provided with a first matching structure 42 on one side of the slot structure 4 at the yoke structure 1, and a first concave-convex structure 41 on the other side. During installation, the first matching structure 42 of two adjacent first segmented cores 51 is plugged together with the other first concave-convex structure 41. It should be noted that the first matching structure 42 and the first concave-convex structure 41 are arranged at the yoke structure 1 below the middle position of the tooth structure 2. More specifically, the first matching structure 42 and the second concave-convex structure 451 are arranged in the low magnetic density area 11 of the stator structure 100, so as to minimize the impact on the performance of the motor. Please refer to Figure 2 In a normal motor, the magnetic circuit goes down in the middle of the tooth structure 2, and moves to both sides at the middle junction of the tooth structure 2 and the yoke structure 1. The bifurcated area formed in the middle is the low magnetic density area 11.

[0074] The cross-sectional shape of the first matching structure 42 can be set as needed, for example, the first matching structure 42 can be a concave arc groove, a concave-convex arc groove, a square groove, etc.; correspondingly, the shape of the first concave-convex structure 41 matches the shape of the first matching structure 42. For example, if the first matching structure 42 is a concave arc groove, then the first concave-convex structure 41 is a convex arc structure that matches the concave arc groove. In this way, when the first matching structure 42 matches the first concave-convex structure 41, the first concave-convex structure 41 can be just accommodated in the first matching structure 42. Of course, there is no limitation on which side of the first segmented core 51 is set with the first matching structure 42 and which side is set with the first concave-convex structure 41, and it can be set as needed.

[0075] In addition, in order to facilitate assembly and accurate positioning, usually one end of the first matching structure 42 is not completely penetrated to form a stop portion 421, and the other end is completely penetrated. In this way, when installing, the first concave-convex structure 41 enters along the side of the first matching structure 42 that is completely penetrated, and when it stops at the stop portion 421, it indicates that it is installed in place. The specific side that is not completely penetrated can be determined according to installation habits. The fact that the first matching structure 42 is not completely penetrated is equivalent to forming a limit structure, which is convenient for positioning.

[0076] When two adjacent first segmented cores 51 are spliced, a splicing gap is formed between the two adjacent first segmented cores 51. The smaller the width of the splicing gap is, the better; if the splicing gap is too large, it is equivalent to increasing the air gap of the motor, which will affect the output performance of the motor, for example, causing the output power of the motor to decrease. Therefore, in this embodiment, the width of the splicing gap is A, and A≤0.2mm.

[0077] Figure 8 A schematic diagram of another embodiment of the positioning structure is shown. Figure 8Each first segmented iron core 51 is provided with a recessed structure 43 on both sides of the slit structure 4 at the yoke structure 1. After two adjacent first segmented iron cores 51 are spliced ​​together, the recessed structures 43 of the two adjacent first segmented iron cores 51 form a cylindrical space; a magnetic conductive metal part 6 is installed in the cylindrical space, and the two ends of the magnetic conductive metal part 6 extend out of the cylindrical space respectively, which are used to extend to the grooves inside and outside the shell 200 of the axial flux permanent magnet motor respectively; after the magnetic conductive metal part 6 is installed, it is fixed by potting glue.

[0078] The cross-sectional shape of the recessed structure 43 can be set as required, for example, the recessed structure 43 can be a square groove, an arc-shaped groove, etc. When the cross-sectional shape of the recessed structure 43 is square, the columnar space formed after the two adjacent first segmented iron cores 51 are spliced ​​is a rectangular parallelepiped, a cube, etc.; when the cross-sectional shape of the recessed structure 43 is arc-shaped, the columnar space formed after the two adjacent first segmented iron cores 51 are spliced ​​is a cylinder, etc.

[0079] During installation, the magnetic conductive metal member 6 is inserted into the cylindrical space, and both ends of the magnetic conductive metal member 6 extend out of the cylindrical space, that is, one end of the magnetic conductive metal member 6 extends toward the inner ring of the stator structure 100 and protrudes from the inner ring of the stator structure 100, and the other end extends toward the outer ring of the stator structure 100 and protrudes from the outer ring of the stator structure 100. Figures 9 to 11 As shown, when the stator structure 100 is installed on the housing 200, the two ends of the magnetic metal piece 6 are respectively extended into the grooves at the corresponding positions of the housing 200, which plays a role in overall positioning. After the magnetic metal piece 6 is placed, the stator structure 100 and the housing 200 are fixed to form a whole by potting glue to strengthen the overall structural strength. Since the stator structure 100 is subjected to axial force and the other side is attracted by the magnetic steel, the magnetic steel will pull the positioning structure toward the magnetic steel surface, so the positioning structure will be subjected to a force to separate from the housing 200. The present invention sets the potting glue so that the stator structure 100 and the housing 200 form a whole, and the force received by the potting glue will also act on the magnetic metal piece 6, which can play a role in strengthening the overall structural strength.

[0080] Furthermore, dividing the stator structure 100 into blocks to form a first block iron core 51 will cause the overall structural strength to deteriorate. At the same time, the stator structure 100 in the axial motor will also be affected by the axial magnetic pull. Therefore, the present invention arranges a magnetic conductive metal part 6, so as to improve the overall structural strength and avoid structural deformation caused by the axial magnetic pull after the stator structure 100 is divided.

[0081] Furthermore, by reserving a recessed structure 43 on each first segmented iron core 51, a cylindrical space is formed after two adjacent first segmented iron cores 51 are spliced ​​together. At this time, the magnetic metal part 6 is inserted into the cylindrical space and then solidified as a whole (for example, by dipping in paint); grooves matching the two ends of the magnetic metal part 6 are reserved on the shell 200. When the two ends of the magnetic metal part 6 are installed in the reserved grooves of the shell 200 and the stator structure 100 is placed as a whole in the shell 200, the stator structure 100 can be fixed inside the shell 200 by pouring sealant, so that the magnetic metal part 6 is subjected to the pressing force of the potting glue and acts on each first segmented iron core 51 at the same time.

[0082] It should be noted that when pouring the potting glue, the potting glue plane is lower than the surface of the first segmented iron core 51. The potting glue flows into each first segmented iron core 51, which can play a sealing role on the one hand and a heat dissipation role on the other hand. Assuming that the potting glue is not filled, there will be an air gap between the first segmented iron core 51 and the shell 200, and there will be air, but the heat transfer performance of air is relatively poor and cannot play a heat dissipation role; however, when the potting glue is filled, the thermal conductivity is better than that of air, and it can play a heat dissipation role.

[0083] In addition, the shape of the magnetic conductive metal member 6 is not specifically limited here, and can be a cylindrical rod-shaped structure or a cubic rod-shaped structure. It should be emphasized that the magnetic conductive metal member 6 is arranged in the low magnetic density area 11, so that the effect on the motor performance is minimal. The material of the magnetic conductive metal member 6 is also not specifically limited here, for example, it can be 45# steel.

[0084] Fig.12 Schematic diagram of a third embodiment of the stator structure 100 for an axial flux permanent magnet motor of the present invention is shown. Fig.12 When the slot structure 4 does not penetrate the tooth structure 2 in the axial direction, the slot structure 4 includes a first section 44 and a second section 45. The first section 44 extends from the bottom of the tooth slot 3 to the middle position of the tooth structure 2 in the circumferential direction. The second section 45 is connected to the first section 44, and the second section 45 extends from the end of the first section 44 toward the bottom of the yoke structure 1. The second section 45 passes through the middle position of the tooth structure 2 and is at the yoke structure 1 in the axial direction below. The slot structure 4 divides the stator structure 100 into a plurality of second segment cores 52, and the plurality of second segment cores 52 are spliced ​​together. The second segment core 52 includes a plurality of silicon steel sheets stacked in the radial direction.

[0085] like Figure 1 As shown, the coils of the conventional axial flux permanent magnet motor need to be inserted into the slots of the tooth slots 3 one by one, and the slots of the tooth slots 3 are relatively small (usually around 3.5 mm), and the coils that need to be inserted (usually copper wires) usually consist of 20, 60, or even more coils, so it is very inefficient to insert them one by one.

[0086] like Fig.14 As shown, in this embodiment, the stator structure 100 is divided into a plurality of second segmented cores 52, so that multiple coils can be inserted from the yoke direction, which is beneficial to improving the wire insertion efficiency. The coils can be inserted as a whole from the yoke direction, for example, 60 coils can be inserted at one time.

[0087] In addition, the present invention uses a block core, and the shape of the block core is more flexible, for example, it can be set as follows Fig.12 The Z-shape shown solves the problem of bending stress in the traditional stator structure on the one hand, and also makes it easier to insert the coil on the other hand.

[0088] like Figures 13 to 17 , two adjacent second segmented cores 52 are spliced ​​by the concave-convex structure. Specifically, each second segmented core 52 is provided with a second matching structure 452 on one side of the second section 45, and a second concave-convex structure 451 on the other side. During installation, the second matching structure 452 of two adjacent second segmented cores 52 is plugged together with the other second concave-convex structure 451; wherein, the joint of the second matching structure 452 and the second concave-convex structure 451 is located in the low magnetic density area 11. By setting the joint of the second matching structure 452 and the second concave-convex structure 451 in the low magnetic density area 11, the influence on the motor performance is minimized.

[0089] Specifically, the first section 44 and the second section 45 can be arranged such that the end of the first section 44 does not reach the middle position of the tooth structure 2, and the second section 45 extends obliquely from the end of the first section 44 toward the bottom of the yoke structure 1; or the end of the first section 44 is located in the middle position of the tooth structure 2, and the second section 45 extends axially from the end of the first section 44 to the bottom of the yoke structure 1. In either case, the second section 45 needs to pass through the low magnetic density area 11 axially below the middle position of the tooth structure 2.

[0090] The cross-sectional shape of the second matching structure 452 can be set as needed, for example, the second matching structure 452 can be a concave arc groove, a concave-convex arc groove, a square groove, etc.; correspondingly, the shape of the second concave-convex structure 451 matches the shape of the second matching structure 452. For example, if the second matching structure 452 is a concave arc groove, then the second concave-convex structure 451 is a convex arc structure that matches the concave arc groove. In this way, when the second matching structure 452 matches the second concave-convex structure 451, the second concave-convex structure 451 can be just accommodated in the second matching structure 452. Of course, which side of the second segmented core 52 is set with the second matching structure 452 and which side is set with the second concave-convex structure 451 is not limited here, and can be set as needed.

[0091] Fig.16 Indicated Fig.13Schematic diagram of the second segmented core 52 being inserted into the coil. Fig.16 The coil can be inserted into the yoke structure 1 of the second segment core 52 from a position of the second segment core 52 close to the second section 45 , and then moved to the tooth structure 2 of the second segment core 52 .

[0092] More specifically, the axial thickness of the yoke structure 1 of the second segment core 52 does not exceed the width of the tooth structure 2 of the second segment core 52, so that the coil can be inserted from a position close to the second section 45 and moved onto the tooth structure 2. Since the coil is inserted onto the tooth structure 2, the maximum width of the coil is the width of the tooth structure 2, so the axial thickness of the yoke structure 1 of the second segment core 52 does not exceed the width of the tooth structure 2 of the second segment core 52, otherwise it cannot be inserted.

[0093] In addition, the surface where the second matching structure 452 and the second concavo-convex structure 451 are located is parallel to the axial direction, so that the contact area between the second matching structures 452 and the second concavo-convex structure 451 of two adjacent second segmented cores 52 is the smallest when they match. When the surface where the second matching structure 452 and the second concavo-convex structure 451 are located is tilted relative to the axial direction, the contact area between the second matching structures 452 and the second concavo-convex structure 451 of two adjacent second segmented cores 52 will increase when they match, and the area of ​​the matching gap will also increase, which will cause the performance of the motor to decrease; the surface where the second matching structure 452 and the second concavo-convex structure 451 are located is parallel to the axial direction, which can effectively reduce the gap area.

[0094] The second matching structure 452 and the second concave-convex structure 451 are arranged on the yoke structure 1 near the middle of the yoke structure 1, that is, they are arranged at a position of the yoke structure 1 away from the tooth structure 2. Figure 2 It can be seen from the magnetic circuit diagram that the closer the second matching structure 452 and the second concave-convex structure 451 are to the side of the yoke structure 1 away from the tooth structure 2 (i.e., the bottom of the yoke structure 1), the better. Therefore, while ensuring the strength, the second matching structure 452 and the second concave-convex structure 451 can be set as close to the bottom of the yoke structure 1 as possible.

[0095] Fig.18 The fourth embodiment of the stator structure 100 of the present invention for an axial flux permanent magnet motor is shown. It should be noted that: Fig.18 The middle slot structure 4 is not shown in figure. The specific configuration of the slot structure 4 can refer to the specific configuration of the stator structure 100 for the axial flux permanent magnet motor in the first embodiment, and will not be described in detail here. Fig.18As shown, the yoke structure 1 directly below the tooth slot 3 of the stator structure 100 can be separated to form a third block 53. Specifically, a slit is made axially downward along the slot wall of the tooth slot 3 to obtain the third block 53. During installation, the third block 53 is installed to the corresponding position of the stator structure 100 to form the entire stator structure. This method makes it easy to install the third block 53 after the coil is inserted from the tooth structure 2, which greatly improves the wire embedding efficiency. In addition, positioning structures for matching with the yoke structure 1 are respectively provided on both sides of the third block 53. The positioning structure can adopt a conventional concave-convex structure, which will not be described in detail here.

[0096] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, ordinary technicians in this field can make other different forms of changes or modifications without creative work, which should fall within the scope of protection of the present invention.

Claims

1. A stator structure for an axial flux permanent magnet motor, characterized in that: include: Yoke structure; A plurality of tooth structures are connected to the yoke structure, a tooth groove is formed between two adjacent tooth structures, a slot structure is axially provided at the middle position of each tooth structure, and the slot structure does not penetrate the tooth structure or penetrates the tooth structure and the yoke structure in the axial direction; Wherein, when the slit structure does not penetrate the tooth structure in the axial direction, the end of the slit structure opposite to the yoke structure in the axial direction is spaced from the top of the tooth structure; When the slit structure axially penetrates the tooth structure and the yoke structure, the stator structure is divided into a plurality of first segmented cores, wherein the first segmented cores are formed by radial laminations, and a plurality of first segmented cores are spliced ​​together to form the stator structure.

2. The stator structure for an axial flux permanent magnet motor according to claim 1, characterized in that: When the slit structure does not penetrate the tooth structure in the axial direction, the other end of the slit structure extends in the axial direction toward the yoke structure and does not exceed the bottom of the tooth groove, and the interval between the slit structure and the top of the tooth structure is L, L ≥ 2 mm; And / or, the width of the slit structure along the circumferential direction is H, 0.2mm≤H≤0.5mm.

3. The stator structure for an axial flux permanent magnet motor according to claim 1, characterized in that: When the slotted structure penetrates the tooth structure and the yoke structure along the axial direction, two adjacent first segmented cores are positioned together at the yoke structure by the positioning structure; Two adjacent first segmented cores are spliced ​​to form a splicing gap, and the width of the splicing gap is A, where A≤0.2 mm.

4. The stator structure for an axial flux permanent magnet motor according to claim 3, characterized in that: Each first segmented iron core is provided with a first matching structure on one side of the slotted structure located at the yoke structure, and a first concave-convex structure on the other side; during installation, the first matching structures of two adjacent first segmented iron cores are plugged together with the other first concave-convex structure.

5. The stator structure for an axial flux permanent magnet motor according to claim 3, characterized in that: Each first segmented iron core is provided with a recessed structure on both sides of the slotted structure at the yoke structure, and after two adjacent first segmented iron cores are spliced ​​together, the recessed structures of the two adjacent first segmented iron cores form a cylindrical space; A magnetic conductive metal piece is installed in the cylindrical space, and two ends of the magnetic conductive metal piece extend out of the cylindrical space respectively, and are used to extend to grooves inside and outside the housing of the axial flux permanent magnet motor respectively; After the magnetic conductive metal part is installed, it is fixed by potting glue.

6. The stator structure for an axial flux permanent magnet motor according to claim 3, characterized in that: Each of the first segmented cores includes a plurality of silicon steel sheets stacked in a radial direction.

7. The stator structure for an axial flux permanent magnet motor according to claim 3, characterized in that: When the slot structure does not penetrate the tooth structure in the axial direction, the slot structure includes a first section and a second section, the first section is extended from the bottom of the tooth groove in the circumferential direction to the middle position of the tooth structure, the second section is connected to the first section, and the second section is extended from the end of the first section toward the bottom of the yoke structure, and the second section passes through the middle position of the tooth structure and the yoke structure in the axial direction below; The slotted structure divides the stator structure into a plurality of second segmented iron cores, and the plurality of second segmented iron cores are spliced ​​together.

8. The stator structure for an axial flux permanent magnet motor according to claim 7, characterized in that: Each second segmented core has a second matching structure on one side of the second section and a second concave-convex structure on the other side. During installation, the second matching structures of two adjacent second segmented cores are plugged into the second concave-convex structure of the other one. The joint between the second matching structure and the second concave-convex structure is located in a low magnetic density area.

9. The stator structure for an axial flux permanent magnet motor according to claim 8, characterized in that: The thickness of the yoke structure of the second segmented core in the axial direction does not exceed the width of the tooth structure of the second segmented core; or, The second matching structure and the second concave-convex structure are located on a surface parallel to the axial direction.

10. An axial flux permanent magnet motor, characterized in that: The invention comprises a stator structure for an axial flux permanent magnet motor according to any one of claims 1 to 9.

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