Axial flux motor and assembling method thereof

Abstract

The invention discloses an axial magnetic flux motor and an assembling method thereof, and relates to the technical field of axial magnetic flux permanent magnet motors. Comprising a stator outer sleeve, a stator core, a stator inner sleeve, a fixed pin column and an armature winding, the fixing pin column comprises a first fixing pin and a second fixing pin; the first fixing pin and the second fixing pin are made of non-magnetic materials and are different from each other; the circumferential side walls of the stator outer sleeve, the stator inner sleeve and the stator iron core are all provided with a certain number of fixing pin holes, and the stator iron core is located between the stator inner sleeve and the stator outer sleeve; the fixed pin column sequentially penetrates through the stator outer sleeve and the stator iron core and then is inserted into the stator inner sleeve, namely the stator iron core is fixed by utilizing the fixed pin column; the armature winding is wound on the stator iron core; according to the invention, the loss in the fixing pin can be effectively reduced, the output efficiency of the motor is improved, the structural strength of the stator assembly is ensured, the stator assembly is convenient to fix and assemble, and the production and assembly efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of axial flux permanent magnet motor, more particularly, to an axial flux motor and an assembling method thereof. BACKGROUND

[0002] Due to the torque density and power density advantages of the axial flux permanent magnet motor, it is widely used in electric vehicles, aerospace, unmanned aerial vehicles and robots. Among them, the torque performance of the axial flux permanent magnet motor with double-rotor single-stator structure is obviously better than that of the double-stator single-rotor structure motor, so the double-rotor single-stator structure is more widely used. The typical double-rotor single-stator structure axial flux permanent magnet motor is YASA motor, that is, the axial flux permanent magnet motor with SMC material yokeless segmented stator core structure. When the above motor fixed stator assembly is fixed and supported by two side plates, the axial deformation of the stator assembly may occur during the whole machine assembly process, thereby affecting the normal operation of the motor. Similarly, when the stator assembly is assembled and fixed, aluminum sheets and bolts are also used for fixation, the stator tooth width of the core structure is changed, and epoxy resin is used for packaging, but the loss of the fixation components is not considered in the above assembly and fixation schemes, and the production and assembly are more complicated, which may affect the structural strength of the stator assembly during normal operation of the motor.

[0003] That is, in the prior art, the double-rotor single-stator structure axial flux permanent magnet motor generally uses two side plates to assemble and fix the stator assembly, or uses aluminum sheets and bolts for fixation, or uses epoxy resin for fixation, all of which have the problems of weak structural strength, unreliable assembly and fixation, loss of fixation components, etc., thereby affecting the overall output efficiency of the motor, and the assembly and fixation are complicated, which affects the industrial production efficiency. SUMMARY

[0004] Therefore, the purpose of the present application is to provide an axial flux motor, more particularly, a double-rotor single-stator axial flux motor, to solve the problems of additional loss in the fixation components, weak structural strength, and complicated production and assembly process when using the traditional stator assembly fixation.

[0005] To achieve the above purpose, the technical scheme of the present application is as follows:

[0006] An axial flux motor, comprising a stator assembly, the stator assembly comprising a stator outer sleeve, a stator core, a stator inner sleeve, a fixed pin column and an armature winding;

[0007] The first fixed pin and the second fixed pin of the fixed pin column, the material of the first fixed pin and the second fixed pin is non-magnetic material, and the materials of the first fixed pin and the second fixed pin are different;

[0008] The stator outer sleeve, the stator inner sleeve and the circumferential side wall of the stator core are provided with a plurality of fixing pin holes, and the positions of the fixing pin holes on the stator outer sleeve, the stator inner sleeve and the stator core correspond to each other, the stator core is located between the stator inner sleeve and the stator outer sleeve, the first fixing pin and the second fixing pin are inserted into the stator inner sleeve after passing through the stator outer sleeve and the stator core in sequence, and the first fixing pin and the second fixing pin are uniformly distributed in the circumferential direction, that is, the fixing pin column is used to fix the stator core, and the materials of the adjacent two fixing pin columns are different, and the armature winding is wound on the stator core.

[0009] Specifically, the number of fixing pin holes provided at the axial center positions of the stator inner sleeve and the stator outer sleeve should be consistent with the number of fixing pin holes provided on the stator core, and the positions of the fixing pin holes are uniformly distributed along the circumferential surfaces of the components, and the height of the fixing pin holes in the axial direction is also consistent with the stator core. The stator inner sleeve and the stator outer sleeve are located at the inner and outer circles of the stator core, respectively, so that the magnetic flux generated by the permanent magnet on the rotor core does not penetrate the stator inner sleeve and the stator outer sleeve. Considering the structural strength, the stator inner sleeve and the stator outer sleeve are made of the same non-magnetic metal material, which is generally stainless steel.

[0010] In the application, the first fixing pin and the second fixing pin are made of non-magnetic materials, wherein the first fixing pin is made of non-magnetic metal material, and the second fixing pin is made of non-magnetic non-metal material. In order to ensure the structural strength of the motor, the non-magnetic metal material is generally made of stainless steel, and in order to reduce the circulating loss that may occur in the fixing pin column, the non-magnetic non-metal material is generally made of epoxy glass fiber or epoxy resin, and the two kinds of material fixing pins are uniformly distributed, that is, the materials of the adjacent two fixing pin columns are different.

[0011] The surface of the non-magnetic metal material fixing pin needs to be insulated, that is, an insulating layer is formed on the outer surface of the first fixing pin. The insulating layer can be formed by spraying insulating paint, epoxy coating and ceramic plating, etc. to completely isolate the current in the circulating loop formed by the first fixing pin and the stator inner and outer sleeves, suppress the additional loss in the circulating loop, and thus improve the efficiency of the axial flux permanent magnet motor. At the same time, the diameter of the first fixing pin is not exactly the same as the diameter of the fixing pin hole, because the first fixing pin surface needs to be sprayed with insulating paint or coated with ceramic insulating measures, and the thickness allowance also needs to be considered, as well as the difficulty of assembly process, that is, the first fixing pin after insulation treatment can be smoothly inserted into the stator inner sleeve, the stator outer sleeve and the stator core.

[0012] The axial length of the inner stator sleeve and the outer stator sleeve is the same as the axial length of the stator core, and the fixing pin hole on the inner stator sleeve does not completely penetrate the entire inner stator sleeve, while the fixing pin hole on the outer stator sleeve completely penetrates the entire outer stator sleeve.

[0013] Further, the stator core is an integer slot stator core or a fractional slot stator core.

[0014] Further, the integer slot stator core and the fractional slot stator core are both made by winding and laminating silicon steel sheets, and both include a stator yoke in the form of a ring, and a plurality of stator teeth are arranged in a circle on the stator yoke, and the gap between adjacent stator teeth forms a stator slot for mounting the armature winding.

[0015] Further, when the stator core is a fractional slot stator core, a fixing pin hole is arranged at the center of each stator tooth; when the stator core is an integer slot stator core, the number of fixing pin holes on the stator core is determined according to the number of pole pairs of the rotor, and the fixing pin holes are also arranged at the axial center of the stator teeth.

[0016] Specifically, for a fractional slot stator core, the number of fixing pin holes is generally determined by the number of stator teeth, that is, a fixing pin hole can be arranged at the center of each stator tooth; but for an integer slot stator core, because the number of stator teeth is too large, to simplify the fixing structure, the number of fixing pin holes on the stator core is determined according to the number of pole pairs of the motor, for example, if the number of pole pairs of the rotor is 4, then the number of poles is 8, at this time, 8 fixing pin holes are arranged on the integer slot stator core to meet the structural strength, and the fixing structure is also simplified, and the assembly efficiency is improved. The number of fixing pin holes arranged at the center of the inner stator sleeve and the outer stator sleeve should be consistent with the number of fixing pin holes arranged on the stator core, and the positions of the fixing pin holes are uniformly distributed along the circumferential surface of each component, and the height of the fixing pin holes in the axial direction is also consistent.

[0017] Further, a first annular reinforcing rib is arranged on the outer circumferential surface of the inner stator sleeve.

[0018] Further, a second annular reinforcing rib is arranged on the inner circumferential surface of the outer stator sleeve.

[0019] That is, the inner stator sleeve and the outer stator sleeve are both designed with a certain thickness of annular reinforcing rib at the position of the fixing pin hole to increase the structural support strength of the inner stator sleeve and the outer stator sleeve. The difference is that the annular reinforcing rib of the inner stator sleeve is located on the outer circumferential surface of the inner stator sleeve, and the annular reinforcing rib of the outer stator sleeve is located on the inner circumferential surface of the outer stator sleeve.

[0020] The thickness of the first annular reinforcing rib is determined according to the length of the inner end of the armature winding, and is used to increase the support and fixing strength of the inner sleeve of the stator.

[0021] Further, grooves for assembling angular bearing are arranged on the upper and lower sides of the inner ring of the inner sleeve of the stator in the axial direction; and bolt holes and annular sealing holes are arranged on the upper and lower end faces of the inner sleeve of the stator.

[0022] In the above technical solution, the specific shape structure of the stator core is not unique, but the stator core includes a stator tooth, a stator slot and a stator yoke. The first fixing pin surface also has various insulation measures, such as spraying insulation and ceramic plating, and the specific insulation measure is adjusted according to the design requirement, cost and production process.

[0023] The application also provides an assembling method of the stator assembly in any one of the axial flux motors.

[0024] (1) A plurality of radial fixing pin holes are arranged at the central position of the axial direction of the inner sleeve of the stator, the stator core and the outer sleeve of the stator;

[0025] (2) The silicon steel sheets are wound along the circumferential direction, and are stacked along the circumferential direction according to the required stacking rate to obtain the stator core,

[0026] (3) The armature winding is wound on the stator core, the inner sleeve of the stator is arranged at the inner ring position of the stator core, the outer sleeve of the stator is arranged at the outer ring position of the stator core, the positions of the inner sleeve of the stator, the stator core and the outer sleeve of the stator are arranged outward from the center in sequence, and the positions of the fixing pin holes arranged on the inner sleeve of the stator, the stator core and the outer sleeve of the stator correspond to each other;

[0027] (4) the first and second fixing pins are inserted into the stator core and the stator inner sleeve in turn from the fixing pin holes of the stator outer sleeve in a manner of being evenly distributed in the circumferential direction, i.e. the fixing assembly of the stator winding core is completed.

[0028] It can be understood that, after the assembly of the stator assembly is completed, the subsequent assembly of the rotor assembly can be carried out according to the existing conventional technology to obtain the double-rotor single-stator axial flux motor.

[0029] The present application has the advantages that:

[0030] The present application uses the fixing pin column, the stator inner sleeve and the stator outer sleeve in cooperation, and the fixing pin column adopts two non-magnetic materials, so that only a certain number of fixing pin columns with different materials are inserted into the fixing pin holes of the stator outer sleeve, the stator core and the stator inner sleeve in a manner of being evenly distributed, and the fixing assembly of the stator winding core is completed, and the stator structure of the double-rotor single-stator axial flux motor is formed.

[0031] The fixing pin column adopts two non-magnetic materials, which can reduce the circulating loss that may be generated in the fixing structure while meeting the structural strength.

[0032] The surface of the first fixing pin is insulated to form an insulation layer, such as spraying insulating paint, epoxy coating and ceramic plating, which can completely isolate the current in the circulating loop formed by the fixing pin column and the stator inner and outer sleeves, suppress the additional loss generated in the circulating loop, and thus improve the efficiency of the axial flux permanent magnet motor. At the same time, the assembly fixing structure is more convenient in industrial production and assembly, and the industrial production efficiency can be improved.

[0033] That is, the overall loss in the fixing pin can be effectively reduced, the output efficiency of the motor can be improved, and the structural strength of the stator assembly can be ensured, which facilitates the fixing assembly of the stator assembly and improves the production and assembly efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other embodiments can also be obtained by those skilled in the art according to these drawings.

[0035] Figure 1 It is a schematic diagram of the overall structure of the stator assembly fixing scheme in the present application;

[0036] Figure 2 It is a schematic diagram of the structure of the stator inner sleeve, the stator outer sleeve and the fixing pin in the present application;

[0037] Figure 3It is a structure schematic diagram of the integer slot stator core in the application;

[0038] Figure 4 It is a structure schematic diagram of the fractional slot stator core in the application;

[0039] Figure 5 It is a structure schematic diagram of the stator sleeve in the application;

[0040] Figure 6 It is a structure schematic diagram of the fixing pin distribution in the application;

[0041] Figure 7 It is a structure schematic diagram of the stator inner sleeve in the application;

[0042] Figure 8 It is a structure schematic diagram of the stator assembly assembly fixing scheme in the application.

[0043] Figure 9 It is a structure schematic diagram of the stator assembly assembly fixing scheme in the application.

[0044] Figure 10 It is a structure schematic diagram of the stator assembly assembly fixing scheme in the application.

[0045] Explanation of reference signs:

[0046] 1, stator sleeve; 1-1, fixing pin hole; 1-2, second annular reinforcing rib;

[0047] 2, stator core; 2.1, integer slot stator core; 2.1-1, fixing pin hole; 2.1-2, stator tooth; 2.1-3, stator slot; 2.1-4, stator yoke;

[0048] 2.2, fractional slot stator core; 2.2-1, fixing pin hole; 2.2-2, stator tooth; 2.2-3, stator slot; 2.2-4, stator yoke;

[0049] 3, stator inner sleeve; 3-1, bolt hole; 3-2, fixing pin hole; 3-3, inner circle groove; 3-4, first annular reinforcing rib; 3-5, annular sealing hole;

[0050] 4, fixing pin column; 4-1, first fixing pin; 4-2, insulation layer; 4-3, second fixing pin; 5, armature winding. DETAILED DESCRIPTION

[0051] In order to make the above-mentioned purposes, features and advantages of the application more obvious and easy to understand, the application will be further described in detail below with reference to the drawings and specific embodiments.

[0052] As Figure 1The diagram shows the overall structure of the stator assembly and fixing scheme in the axial flux motor provided in this embodiment. The axial flux motor includes a stator assembly, which comprises a stator outer sleeve 1, a stator core 2, a stator inner sleeve 3, fixing pins 4, and an armature winding 5. A certain number of fixing pin holes are provided on the outer circumference of the stator outer sleeve 1, the stator inner sleeve 3, and the stator core 2, namely fixing pin hole 1-1 on the stator outer sleeve 1, fixing pin hole 3-2 on the stator inner sleeve 3, and fixing pin holes 2.1-1 / 2.2-1 on the stator core 2, facilitating the assembly and fixing of the fixing pins 4. The stator core 2 is located between the stator inner sleeve 3 and the stator outer sleeve 1; that is, the inner ring of the stator core 2 is the stator inner sleeve 3, and the outer ring of the stator core 2 is the stator outer sleeve 1. During assembly and fixing, the fixing pins 4 first pass through the stator outer sleeve 1, then the stator core 2, and finally are inserted into the stator inner sleeve 3. The armature winding 5 is wound on the stator core 2 according to the designed winding pitch. The conductor portion of the distributed winding is in the stator slot of the stator core 2. The end windings on the inner and outer sides of the circumference of the stator core 2 are not in the stator core 2, and the two-sided windings are symmetrical about the stator yoke. Except for the armature winding 5, which is cured with adhesive afterward, all other components are assembled and fixed by interference fit.

[0053] like Figure 2 The diagram shows the stator inner sleeve, stator outer sleeve, and fixing pin structure described in this invention. The positional relationship between the stator outer sleeve 1, stator inner sleeve 3, and fixing pin 4 is clearly visible. The stator inner sleeve 3 is located on the inner side of the diagram, the stator outer sleeve 1 is located on the outer side, and the fixing pin 4 is located between the stator inner sleeve 3 and the stator outer sleeve 1. The stator outer sleeve 1 is connected to the motor housing and acts as a fixed support during normal motor operation. Similarly, the stator inner sleeve 3 is connected to the motor's rotating shaft via an angular bearing and remains stationary during normal motor operation, also serving as a fixed support. The main fixing components of the assembly and fixing scheme provided by this invention are the stator outer sleeve 1, stator inner sleeve 3, and fixing pin 4. The stator core 2 is the object of this invention and can therefore be adjusted according to specific design requirements. The stator core 2 is not unique and can be an integer-slot stator core 2.1 or a fractional-slot stator core 2.2.

[0054] like Figure 3 and 4As shown, two stator core structure schematic diagrams provided by the scheme are provided, and the two structure stator cores provided by the scheme are respectively integer slot stator core 2.1 and fractional slot stator core 2.2. The shapes of the stator teeth of the two structure stator cores and the widths of the stator slots can be different, and the other structure parts are basically the same. The integer slot stator core 2.1 and the fractional slot stator core 2.2 both need to have the fixed pin hole 2.1-1 / 2.2-1 in the stator core, the stator tooth 2.1-2 / 2.2-2, the stator slot 2.1-3 / 2.2-3 and the stator yoke 2.1-4 / 2.2-4, wherein the stator yoke 2.1-4 / 2.2-4 is the main structure of the high structure strength of the integer slot stator core 2.1 and the fractional slot stator core 2.2 itself, that is, all the stator teeth are connected into a whole through the stator yoke, which can improve the structure strength of the stator core itself, and the fixed pin hole 2.1-1 / 2.2-1 is arranged outside the circumference of the stator tooth 2.1-2 / 2.2-2. The stator yoke 2.1-4 / 2.2-4 is relatively thin, and the magnetic flux directly penetrates the stator tooth 2.1-2 / 2.2-2 without passing through the stator yoke part. At the same time, the integer slot stator core 2.1 and the fractional slot stator core 2.2 are both made of very thin silicon steel sheets, that is, the silicon steel sheets are wound along the circumferential direction of the diagram, and are stacked along the circumferential radial direction according to a certain stacking coefficient. When the stator core is wound, attention should be paid to the inner and outer diameters of the stator core during design.

[0055] In addition, for the fractional slot stator core 2.2, the number of fixed pin holes 2.2-1 is generally determined by the number of stator teeth 2.2-2, that is, the center position of each stator tooth 2.2-2 can correspond to a fixed pin hole 2.2-1;

[0056] But for the integer slot stator core 2.1, because the number of stator teeth 2.1-2 is too large, in order to simplify the fixed structure, the number of pin holes on the stator tooth is determined according to the number of rotor poles of the motor, that is, a fixed pin hole 2.1-1 is arranged under each level.

[0057] Therefore, no matter on the integer slot stator core 2.1 or on the fractional slot stator core 2.2, the position of the fixed pin hole 2.1-1 / 2.2-1 is located at the axial center position of the corresponding stator tooth 2.1-2 / 2.2-2, that is, the position of the fixed pin hole 2.1-1 / 2.2-1 is located at the stator yoke 2.1-4 / 2.2-4 part of the stator core. And the position of the fixed pin hole 2.1-1 / 2.2-1 is uniformly distributed along the circumferential direction, and the fixed pin hole 2.1-1 / 2.2-1 completely penetrates the radial thickness of the stator core along the radial direction, that is, when assembled, the fixed pin column 4 completely penetrates the integer slot stator core 2.1 or the fractional slot stator core 2.2, so as to realize the fixed assembly.

[0058] AsFigure 5 As shown in the structure diagram of the separate stator sleeve 1 of the application, the structure mainly comprises the fixing pin hole 1-1 opened in the circumferential outer ring of the stator sleeve 1 and the second annular reinforcing rib 1-2 for reinforcing the fixing support. The second annular reinforcing rib 1-2 is located in the inner ring of the stator sleeve 1 and protrudes a certain thickness along the circumferential radial direction to the center on the circumference where the fixing pin hole 1-1 is opened on the outer side of the stator sleeve 1, and the purpose is to strengthen the fixing support of the stator sleeve 1.

[0059] As shown in the structure diagram of the separate stator sleeve 1 of the application, the structure mainly comprises the fixing pin hole 1-1 opened in the circumferential outer ring of the stator sleeve 1 and the second annular reinforcing rib 1-2 for reinforcing the fixing support. The second annular reinforcing rib 1-2 is located in the inner ring of the stator sleeve 1 and protrudes a certain thickness along the circumferential radial direction to the center on the circumference where the fixing pin hole 1-1 is opened on the outer side of the stator sleeve 1, and the purpose is to strengthen the fixing support of the stator sleeve 1. Figure 6 As shown in the structure diagram of the separate stator sleeve 1 of the application, the structure mainly comprises the fixing pin hole 1-1 opened in the circumferential outer ring of the stator sleeve 1 and the second annular reinforcing rib 1-2 for reinforcing the fixing support. The second annular reinforcing rib 1-2 is located in the inner ring of the stator sleeve 1 and protrudes a certain thickness along the circumferential radial direction to the center on the circumference where the fixing pin hole 1-1 is opened on the outer side of the stator sleeve 1, and the purpose is to strengthen the fixing support of the stator sleeve 1.

[0060] As shown in the structure diagram of the separate stator sleeve 1 of the application, the structure mainly comprises the fixing pin hole 1-1 opened in the circumferential outer ring of the stator sleeve 1 and the second annular reinforcing rib 1-2 for reinforcing the fixing support. The second annular reinforcing rib 1-2 is located in the inner ring of the stator sleeve 1 and protrudes a certain thickness along the circumferential radial direction to the center on the circumference where the fixing pin hole 1-1 is opened on the outer side of the stator sleeve 1, and the purpose is to strengthen the fixing support of the stator sleeve 1. Figure 7The diagram shows a schematic of the stator inner sleeve structure disclosed in this invention. As can be seen, the stator inner sleeve 3 mainly includes bolt holes 3-1 for fixing the angular contact bearing, fixing pin holes 3-2 on the outer ring of the stator inner sleeve 3, grooves 3-3 on the inner ring of the stator inner sleeve 3 for assembling the angular contact bearing, a first annular reinforcing rib 3-4 on the circumference of the outer ring of the stator inner sleeve 3, and an annular sealing hole 3-5 for sealing the angular contact bearing. The fixing pin holes 3-2 on the outer ring of the stator inner sleeve 3 are also located at the middle of their axial height and are evenly distributed along their circumference. The first annular reinforcing rib 3-4 is designed on the circumference of the fixing pin holes, similar to the annular reinforcing rib in the stator outer sleeve 1. The difference is that the annular reinforcing rib 1-2 in the stator outer sleeve 1 is located inside the stator outer sleeve 1, while the first annular reinforcing rib 3-4 in the stator inner sleeve 3 is located on the outer side of the stator inner sleeve 3, thus strengthening the fixing and supporting capacity of the stator inner sleeve 3.

[0061] Bolt holes 3-1 and annular sealing holes 3-5 are located on the upper and lower end faces of the stator inner sleeve 3. Since the motor structure is a dual-rotor, single-stator structure, two angular contact bearings are required for connection to the rotating shaft. These bearings are located in the grooves 3-3 at the upper and lower ends of the inner ring of the stator inner sleeve 3. The axial length of the grooves 3-3 should meet the axial length of the corresponding angular contact bearings, and they should be recessed to a certain depth away from the center. The angular contact bearings are fixed using bolt holes 3-1, bolts, and bearing cover plates on the upper and lower end faces.

[0062] like Figure 8 The diagram shows the side view and cross-sectional view of the overall structure of the stator assembly assembly and fixing scheme. The side view shows that the stator outer sleeve 1, the integer slot stator core 2.1, and the stator inner sleeve 3 have the same axial height, and the radial fixing pin holes on each component are all located at the midpoint of their respective axial heights. The cross-sectional view shows the internal connection relationship between the components, i.e., the fixing pins 4 are inserted sequentially into the stator outer sleeve 1, stator core 2, and stator inner sleeve 3. The structural strength of the entire stator assembly is ensured by the annular reinforcing ribs on the inner ring of the stator outer sleeve 1 and the outer ring of the stator inner sleeve 3, preventing axial displacement.

[0063] like Figure 9 The figure shows a comparison of circulating current losses for motors using different fixing pin schemes. Scheme I indicates that all fixing pins 4 are made of non-magnetic metal, while Scheme II indicates that adjacent fixing pins 4 are made of two different materials: a first fixing pin 4-1 made of non-magnetic metal and a second fixing pin 4-3 made of non-magnetic non-metallic material, which are alternately distributed. The vertical axis represents the magnitude of the losses generated in the circulating current loop formed between the fixing pins 4 and the stator outer sleeve 1 and stator inner sleeve 3. It can be seen that Scheme II significantly reduces circulating current losses compared to Scheme I.

[0064] The present application provides a structure assembly, the stator core 2 with the armature winding 5 is fixed to the center position of the stator inner sleeve 3, the stator outer sleeve 1 is placed in the outer circle position of the stator core 2, so that the positions of the stator inner sleeve 3, the stator core 2 and the stator outer sleeve 1 are arranged outward from the center of the circle in turn, and the positions of the radial fixing pin holes in the stator inner sleeve 3, the stator core 2 and the stator outer sleeve 1 correspond to each other. The fixing pin column 4 is inserted into the stator core 2 and the stator inner sleeve 3 from the fixing pin hole of the stator outer sleeve 1 in turn. The fixing assembly scheme only needs to insert a certain number of fixing pin columns 4 into the fixing pin holes in the stator outer sleeve 1, the stator core 2 and the stator inner sleeve 3, so as to complete the fixing assembly of the stator winding core, which is simple and convenient to assemble and improves the industrial production efficiency.

[0065] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0066] In the present application, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specified. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0067] In the description of the specification, the description of the terms "the embodiment", "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any suitable manner in at least one embodiment or example. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0068] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0069] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and simple improvement made on the essential content of the present application shall be included in the protection scope of the present application.

Claims

1. An axial flux motor, characterized in that, It includes a stator assembly, which includes a stator outer sleeve, a stator core, a stator inner sleeve, a fixing pin, and an armature winding; The fixing pin includes a first fixing pin and a second fixing pin. Both the first fixing pin and the second fixing pin are made of non-magnetic materials, and the two are made of different materials. A certain number of fixing pin holes are formed on the circumferential sidewalls of the stator outer sleeve, the stator inner sleeve, and the stator core, and the positions of the fixing pin holes on the stator outer sleeve, the stator inner sleeve, and the stator core correspond to each other. The stator core is located between the stator inner sleeve and the stator outer sleeve. The first fixing pin and the second fixing pin pass through the stator outer sleeve and the stator core in sequence and are then inserted into the stator inner sleeve. The first fixing pin and the second fixing pin are evenly distributed in the circumferential direction. The armature winding is wound on the stator core.

2. The axial flux motor according to claim 1, characterized in that, The first fixing pin is made of a non-magnetic metal material, and the second fixing pin is made of a non-magnetic non-metallic material; An insulating layer is formed on the outer surface of the first fixing pin.

3. The axial flux motor according to claim 2, characterized in that, The non-magnetic metal material is stainless steel; the non-magnetic non-metallic material is epoxy resin or epoxy glass fiber.

4. The axial flux motor according to claim 1, characterized in that, The stator core is an integer slot stator core or a fractional slot stator core.

5. The axial flux motor according to claim 4, characterized in that, Both the integer slot stator core and the fractional slot stator core are made by winding and stacking silicon steel sheets, and both include an annular stator yoke. The stator yoke has a plurality of stator teeth arranged in a circular array, and the gap between adjacent stator teeth forms a stator slot for mounting the armature winding.

6. The axial flux motor according to claim 5, characterized in that, When the stator core is a fractional slot stator core, a fixing pin hole is opened at the center position of each stator tooth; when the stator core is an integer slot stator core, the number of fixing pin holes on the stator core is determined according to the number of rotor pole pairs, and the fixing pin holes are also opened at the axial center position of the stator teeth.

7. The axial flux motor according to claim 1, characterized in that, The outer circumferential surface of the stator inner sleeve is provided with a first annular reinforcing rib.

8. The axial flux motor according to claim 1, characterized in that, The inner circumferential surface of the stator jacket is provided with a second annular reinforcing rib.

9. The axial flux motor according to claim 1, characterized in that, The inner ring of the stator inner sleeve has grooves on the upper and lower sides along the axial direction for assembling angular bearings; bolt holes and annular sealing holes are also provided on the upper and lower end faces of the stator inner sleeve.

10. The assembly method of the stator assembly according to any one of claims 1-9, characterized in that, Includes the following steps: (1) A certain number of radial fixing pin holes are opened at the center position of the stator inner sleeve, stator core and stator outer sleeve in the axial direction. (2) The silicon steel sheets are wound along the circumferential direction and stacked along the circumferential radial direction according to the required stacking ratio to obtain the stator core. (3) Wrap the armature winding on the stator core. With the stator core with the armature winding wrapped as the center position of the stator structure, place the stator inner sleeve in the inner ring position of the stator core and the stator outer sleeve in the outer ring position of the stator core, so that the positions of the stator inner sleeve, stator core and stator outer sleeve are arranged outward from the center of the circle, while ensuring that the positions of the fixing pin holes opened on the stator inner sleeve, stator core and stator outer sleeve correspond to each other. (4) Insert the first fixing pin and the second fixing pin into the stator core and the stator inner sleeve respectively through the fixing pin hole of the stator outer sleeve in a manner that is evenly distributed in the circumferential direction, thereby completing the fixing assembly of the stator winding core.

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