Combined axial flux motor

Abstract

A combined axial magnetic flux motor comprises a motor base, annular rotor modules are arranged in the motor base at intervals in the axial direction of the motor base, and annular stator modules are arranged close to the axial opposite sides of the rotor modules. The motor shaft penetrates through the stator module, the rotor module and the motor base in the axial direction of the motor base and is concentrically arranged. The peripheral surface of the motor base is provided with auxiliary holes which are communicated with the interior of the motor base. Each stator module can be placed in a corresponding position in the motor base through the corresponding auxiliary hole and is fixedly connected with fixing plates which are arranged in the motor base at intervals. When the rotor module needs to be assembled in the later period, the rotor module can also be arranged in the motor base through the process hole, and then the motor shaft uniformly penetrates through the stator module and the rotor module, so that the assembly work between the stator module and the motor base can be completed in advance, and the subsequent assembly work amount of the rotor module is reduced.

Description

Technical Field

[0001] This utility model relates to axial flux motors, specifically to a combined axial flux motor. Background Technology

[0002] Axial flux motors differ from ordinary motors in that their magnetic flux direction is axial, the current-carrying conductors are placed radially, and the stator and rotor cores have a ring-shaped disc structure. The core technological advantage of axial flux motors lies in the fact that the rotor is located on the side of the stator (rather than inside the stator), allowing for a larger rotor diameter. Since torque = force × radius, higher torque output can be achieved under the same force. This means that with the same permanent magnet materials and copper wire materials, higher torque output can be obtained.

[0003] The patent document entitled "A stator-rotor unit combination structure and a multi-stage series magnet type axial flux permanent magnet multi-rotor motor" (document number CN117955308A) discloses a multi-stage series magnet type axial flux permanent magnet multi-rotor motor comprising N rotor output shafts and an axially arranged N stator-rotor unit combination structure; each rotor unit is connected to a different rotor output shaft, and the rotation direction and speed are independent; the stator unit comprises multiple stator modules, each having a stator core and an independent single-phase armature winding; the rotor modules are equipped with axially alternating magnetized permanent magnets, which together with the core form a series flux structure.

[0004] Compared to traditional axial flux motors consisting of a single stator and a single rotor (or dual rotors), the above-mentioned technical solution employs a series structure with multiple stators and rotors interleaved to improve the motor's torque and power density. However, the assembly of such motors is extremely inconvenient. The assembly process generally involves fixing the first stator inside the motor housing, then inserting the motor shaft, and then successively fitting the rotor and the second stator onto the motor shaft and fixing the second stator. This process of sequentially fitting the rotor and stator onto the motor shaft is necessary; otherwise, the central stator cannot be fixed because it will be obstructed by the outer rotors or stators. Therefore, pre-assembly of the stator and motor housing is not possible; the stator installation must be performed simultaneously with the rotor installation, which is detrimental to improving the motor's assembly efficiency. Summary of the Invention

[0005] This invention provides a combined axial flux motor in which the stator and motor base can be pre-assembled, eliminating the need for on-site assembly with the rotor and improving motor assembly efficiency.

[0006] To achieve the above objectives, the technical solution adopted is as follows: a combined axial flux motor, including a motor base, with annular rotor modules arranged at intervals along its axial direction inside the motor base. Annular stator modules are arranged adjacent to the axially opposite side of each rotor module. The motor shaft passes through the stator modules, rotor modules, and motor base along the axial direction of the motor base and is arranged concentrically with each other. The two ends of the motor shaft are rotatably engaged with the front and rear end covers of the motor base through bearings. The rotor modules and the motor shaft are detachably fixedly connected. Fixing plates are arranged at intervals along its axial direction inside the motor base. The surface of the fixing plates is perpendicular to the core of the motor shaft, and a through hole is opened in the middle of the fixing plates for the motor shaft to pass through. The rotor modules and the two stator modules located on their axially opposite sides are arranged in the area between two adjacent fixing plates. The stator modules are detachably fixedly connected to the adjacent fixing plates. Process holes for inserting the stator modules and rotor modules into the area are opened at the radially opposite position on the outer circumference of the motor base.

[0007] Compared with the prior art, the technical advantages of this utility model are as follows: Process holes are provided on the outer circumferential surface of the motor base, connecting to its interior. Each stator module can be inserted into its corresponding position inside the motor base through the corresponding process holes and connected and fixed with the spaced-apart fixing plates inside the motor base. When the rotor module needs to be assembled later, the rotor module can also be inserted into the motor base through the process holes, and then the stator module and rotor module can be inserted uniformly through the motor shaft. This allows the assembly of the stator module and the motor base to be completed in advance, reducing the amount of subsequent rotor module assembly work and improving the assembly efficiency of the rotor module and subsequent assembly processes. Attached Figure Description

[0008] Figure 1 , 2 This is a three-dimensional appearance schematic diagram of the present utility model;

[0009] Figure 3 for Figure 1 The K-direction view in the middle;

[0010] Figure 4 A schematic diagram showing the assembly state of the rotor module, stator module, mounting plate, and motor shaft.

[0011] Figure 5 for Figure 4 The N-direction view in the middle;

[0012] Figure 6 This is a schematic diagram of the rotor module and its inner and outer sleeves;

[0013] Figure 7 This is a cross-sectional view of the structure of this utility model;

[0014] Figure 8 for Figure 7A schematic diagram of a local structure in the image;

[0015] Figure 9 This is a schematic diagram of the spline fit between the motor shaft and the rotor module;

[0016] Figure 10 This is a schematic diagram of the motor shaft and blades. Detailed Implementation

[0017] The following is in conjunction with the appendix Figure 1-10 The present invention will be further described in detail below, along with related content. It is also hereby declared that the axial and radial directions described in this application are based on the axial and radial directions of the motor shaft 40 (or motor base 10).

[0018] A combined axial flux motor includes a motor base 10. Inside the motor base 10, annular rotor modules 20 are arranged at intervals along its axial direction. Annular stator modules 30 are arranged adjacent to the axially opposite sides of each rotor module 20. A motor shaft 40 passes through the stator modules 30, rotor modules 20, and motor base 10 along the axial direction of the motor base 10 and is concentrically arranged with each other. Both ends of the motor shaft 40 are rotatably fitted to the front and rear end covers 11 and 12 of the motor base 10 via bearings (bearings not shown in the figures). The rotor modules 20 and the motor shaft 40 form a detachable fixed structure. The motor base 10 has fixed plates 50 arranged at intervals along its axial direction inside. The surface of the fixed plate 50 is perpendicular to the shaft core of the motor shaft 40, and a through hole 51 is opened in the middle of the fixed plate 50 for the motor shaft 40 to pass through. The rotor module 20 and the two stator modules 30 located on their axially opposite sides are arranged in the area A between the two adjacent fixed plates 50. The stator module 30 and the adjacent fixed plate 50 form a detachable fixed connection. Process holes 13 are opened on the outer peripheral surface of the motor base 10 at a position radially opposite to the area A for the stator module 30 and the rotor module 20 to be inserted into the area A.

[0019] In the above scheme, when assembling the various structures of the entire motor, firstly, the fixing plates 50 are sequentially inserted into the motor base 10 through the front and rear ports, and the fixing plates 50 are connected and fixed to the inner wall of the motor base 10. Adjacent fixing plates 50 form region A, and the process holes 13 are radially opposite to region A. Subsequently, the stator module 30 is inserted into the corresponding region A through the process holes 13. The assembler's hands or tools can be inserted into region A through the process holes 13 to connect and fix the stator module 30 to the fixing plates 50, thereby achieving the assembly between the stator module 30 and the motor base 10.

[0020] After the stator module 30 is assembled, the first rotor module 20 can be inserted into the corresponding area A through the outermost process hole 13 in the axial direction. Then, the motor shaft 40 is inserted into the motor base 10 from the front or rear port. The motor shaft 40 can pass through the stator module 30 and the rotor module 20 successively. At the same time, the assembly personnel's hands or tools can be inserted into the motor base 10 through the process hole 13 to fix the shaft of the rotor module 20 and the motor shaft 40 (here, the shaft of the motor shaft 40 can also be inserted into the center hole of the rotor module 20 by interference fit to achieve mutual fixation between the two). Then, the second rotor module 20 is inserted into the corresponding area A through the second process hole 13, and the motor shaft 40 is pushed forward to pass through the second rotor module 20. This process is repeated until all rotor modules 20, stator modules 30 and motor shafts 40 are inserted. Finally, the front and rear end covers 11 and 12 of the motor base 10 are installed. The assembly work between the stator module 30 and the motor mount 10 can be completed in advance, reducing the amount of subsequent rotor module 20 assembly work, thereby improving the assembly efficiency of the rotor module 20 and subsequent assembly processes.

[0021] Furthermore, to ensure that the rotor module 20 and stator module 30 can be inserted into the motor housing 10 through the process hole 13, the diameter of the process hole 13 in the circumferential direction of the motor housing 10 is larger than the diameter of the rotor module 20 and stator module 30, and the diameter of the process hole 13 in the axial direction of the motor housing 10 is larger than the axial width of the rotor module 20 and stator module 30. Under the premise of ensuring the structural strength of the motor housing 10, the larger the size of the process hole 13, the easier it is to assemble the stator module 30 and rotor module 20.

[0022] As a preferred embodiment, there are at least two process holes 13 radially opposite to region A, and the two process holes 13 are arranged radially opposite each other. Considering that a single process hole 13 is inconvenient for fixing various positions on the stator module 30 and rotor module 20 within region A between two adjacent fixing plates 50, the arrangement of process holes 13 in multiple directions facilitates the fixing of various positions on the stator module 30 and rotor module 20. Without affecting normal assembly, this helps to improve the compactness of the motor structure.

[0023] Furthermore, such as Figure 4 and Figure 5 As shown, in order to facilitate the connection and fixation between the stator module 30 and the fixing plate 50, a flange 31 is provided on the stator module 30, and the flange 31 is connected to the fixing plate 50 by bolts.

[0024] As a preferred embodiment, the inner edge of the rotor module 20 and the shaft of the motor shaft 40 form a spline fit, and the length direction of the spline groove 21 is arranged along the axial length direction of the motor shaft 40. An inner sleeve 41 is fitted on the shaft of the motor shaft 40 located between two adjacent rotor modules 20. An outer sleeve 42 is fitted on the shaft of the motor shaft 40 located between the outer rotor module 20 and the front and rear end covers 11 and 12 of the motor base 10. One end of the outer sleeve 42 away from the rotor module 20 extends to the area between the two farthest fixed plates 50, and the tube end section at this end is connected to the shaft of the motor shaft 40 by bolts. The tube end face of the inner sleeve 41 and the rotor module 20, and the tube end face of the outer sleeve 42 near the rotor module 20 and the adjacent rotor module 20, all form abutting fit. In this design, when assembling the rotor module 20, an outer sleeve 42 is first fixed to one side of the motor shaft 40, and the end of the motor shaft 42 away from the outer sleeve 42 is inserted into the motor base 10. After the rotor module 20 is placed into the area A between two adjacent fixing plates 50, the stability of the rotor module 20 is maintained, allowing the motor shaft 40 to pass through the rotor module 20, while the spline on the motor shaft 40 and the spline groove 21 on the rotor module 20 match each other. After the previous rotor module 20 is inserted, an inner sleeve 41 is fitted onto the motor shaft 40 from the end of the motor shaft 40. Similarly, after the last rotor module 20 is fitted onto the motor shaft 40, another outer sleeve 42 is fitted onto the motor shaft 40 and the two are fixed together, thus forming an outer sleeve 42, rotor module 20, inner sleeve 41, rotor module 20, and outer sleeve 42 arranged in sequence and abutting against each other, restricting the rotor module 20 from moving relative to the motor shaft 40 in the axial length direction, while the relative displacement in the circumferential direction is restricted by the spline fit, thereby ensuring that the rotor module 20 and the motor shaft 40 are stably connected and will not move freely.

[0025] Combination Figure 6-10As shown, the outer circumferential surfaces of the inner and outer sleeves 41 and 42 are spaced apart from the central holes of the radially opposite stator module 30 and fixing plate 50. Through holes 44 are provided on the circumferential surfaces of the inner and outer sleeves 41 and 42 located between two adjacent fixing plates 50. Blades 43 are spaced apart along the circumferential direction on the shaft of the motor shaft 40. The plate surface of the blade 43 is parallel to the shaft core of the motor shaft 40, and both ends of the blade extend along the axial length of the motor shaft 40 to the area between the two farthest fixing plates 50. The free edge of the blade 43 parallel to the motor shaft 40 is embedded in the spline groove 21 on the inner hole edge of the rotor module 20 to form a limiting fit that restricts the circumferential rotation of the rotor module 20 on the motor shaft 40. In this design, the spline groove 21 on the inner edge of the rotor module 20 is specifically embedded with the free edge of the blade 43 of the motor shaft 40 to form a spline fit. The blade 43 cooperates with the through holes 44 and process holes 13 on the inner and outer sleeves 41 and 42. When the motor shaft 40 rotates, the blade 43 rotates, and the airflow inside the motor base 10 is disturbed by the blade 43. The through holes 44 and process holes 13 help the gas exchange between the inside and outside of the motor base 10, thereby improving the heat dissipation effect of the motor.

[0026] In addition, to prevent external debris from entering the motor housing 10 through the process hole 13 during normal use and affecting the normal operation of its internal structure, a protective net is placed over the process hole 13 to achieve the purpose of protection.

Claims

1. A combined axial flux motor, comprising a motor base (10), ring-shaped rotor modules (20) are arranged at intervals along the axial direction of the motor base (10), ring-shaped stator modules (30) are arranged adjacent to the axial opposite sides of each rotor module (20), a motor shaft (40) passes through the stator modules (30), the rotor modules (20) and the motor base (10) along the axial direction of the motor base (10) and is arranged coaxially with each other, the two ends of the motor shaft (40) are rotatably connected with the front and rear end covers (11, 12) of the motor base (10) through bearings, and the rotor modules (20) are detachably fixedly connected with the motor shaft (40), characterized in that: The inner part of the motor base (10) is arranged with fixing plates (50) in the axial direction, the plate surface of the fixing plate (50) is perpendicular to the axis of the motor shaft (40), the middle part of the fixing plate (50) is provided with a through hole (51) for the motor shaft (40) to pass through, the rotor module (20) and the two stator modules (30) located on the opposite sides in the axial direction are arranged in the area (A) between the two adjacent fixing plates (50), the stator module (30) and the adjacent fixing plate (50) form a detachable fixed connection, and the outer circumferential surface of the motor base (10) is provided with process holes (13) at positions radially opposite to the area (A) for the stator module (30) and the rotor module (20) to be placed in the area (A).

2. The combined axial flux motor of claim 1, wherein: The hole diameter of the process hole (13) in the circumferential direction of the motor base (10) is greater than the diameter of the rotor module (20) and the stator module (30), and the hole diameter of the process hole (13) in the axial direction of the motor base (10) is greater than the axial width of the rotor module (20) and the stator module (30).

3. The combined axial flux motor of claim 1 or 2, characterized in that: The process hole (13) radially opposite to the area (A) is at least two and the two process holes (13) are radially arranged.

4. The combined axial flux motor of claim 1, wherein: The stator module (30) is provided with a flange plate (31), and the flange plate (31) is connected with the fixing plate (50) by bolts.

5. The combined axial flux motor of claim 1, wherein: The inner hole edge of the rotor module (20) and the shaft body of the motor shaft (40) form a spline fit, and the spline groove (21) is arranged along the axial length direction of the motor shaft (40), the inner sleeve pipe (41) is sleeved on the shaft body of the motor shaft (40) between the two adjacent rotor modules (20), the outer sleeve pipe (42) is sleeved on the shaft body of the motor shaft (40) between the front and rear end covers (11, 12) of the motor base (10) and the outer rotor module (20), one end of the outer sleeve pipe (42) away from the rotor module (20) extends to the area outside the two farthest fixing plates (50), and the pipe end section of the end is connected with the shaft body of the motor shaft (40) by bolts, the pipe end surface of the inner sleeve pipe (41) and the rotor module (20), and the pipe end surface of the outer sleeve pipe (42) adjacent to the rotor module (20) and the adjacent rotor module (20) form a resistance fit.

6. The combined axial flux motor of claim 5, wherein: The outer circumferential surface of the inner and outer sleeve pipes (41, 42) and the hole wall of the central hole of the radially opposite stator module (30) and fixing plate (50) are arranged at intervals, the through holes (44) are arranged on the circumferential surface of the pipe section of the inner and outer sleeve pipes (41, 42) between the two adjacent fixing plates (50), the blade plates (43) are arranged on the shaft body of the motor shaft (40) in the circumferential direction, the plate surface of the blade plate (43) is arranged parallel to the axis of the motor shaft (40), and the two ends in the plate length direction extend to the area outside the two farthest fixing plates (50) in the axial length direction of the motor shaft (40), the free edge of the blade plate (43) parallel to the motor shaft (40) is embedded in the spline groove (21) on the inner hole edge of the rotor module (20) to form a limiting fit for limiting the circumferential rotation of the rotor module (20) on the motor shaft (40).

7. The combined axial flux motor of claim 1, wherein: The process hole (13) is provided with a protective net.

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