Air gap trimming method of axial flux motor and axial flux motor

Abstract

This application relates to the field of motor technology, and more particularly to an air gap balancing method for an axial flux motor and the axial flux motor itself. The air gap balancing method includes: rotating a rotor to generate a changing magnetic field; a first Hall sensor outputting a first Hall voltage within the changing magnetic field; acquiring a first maximum voltage value of the first Hall voltage; determining a first peak voltage based on the first maximum voltage value; and driving the rotor to move axially based on the first peak voltage. Determining whether the first air gap is within a preset value or range based on the first peak voltage facilitates the detection and balancing of the air gap between the stator and rotor. Furthermore, using a Hall sensor for real-time air gap detection allows for real-time monitoring of the air gap during the operation of the axial flux motor. When the actual axial dimension of the air gap deviates significantly from the preset value, the axial dimension of the air gap can be adjusted by axially moving the rotor.

Description

Technical Field

[0001] This application relates to the field of motor technology, and in particular to an air gap balancing method for an axial flux motor and the axial flux motor itself. Background Technology

[0002] An axial flux motor consists of a stator and a rotor mounted on a shaft. The rotating magnetic field generated by the stator interacts with the magnetic field of the permanent magnets on the rotor, thereby driving the rotor to rotate around the central axis of the shaft. Due to its high torque density and flat structure, axial flux motors have high application value in hub motors and compact layouts.

[0003] However, due to the accumulation of manufacturing errors, the accumulation of assembly errors, and the deformation caused by the unbalanced axial magnetic pull on the rotor, the actual size of the air gap between the stator and the rotor may deviate significantly from the preset value, resulting in risks such as power reduction, power consumption increase, temperature rise, and bearing damage.

[0004] Therefore, how to detect the air gap size in real time and balance the air gap during the assembly and manufacturing process and during use of axial flux motors is an important problem that needs to be solved in this field. Summary of the Invention

[0005] In view of this, this application provides an air gap balancing method for an axial flux motor that can detect and adjust the air gap size in real time, as well as the axial flux motor itself.

[0006] This application provides a method for air gap balancing of an axial flux motor. The axial flux motor includes a first stator, a rotor, and a first Hall sensor disposed on the first stator and facing the rotor. The air gap balancing method includes: rotating the rotor to generate a changing magnetic field; the first Hall sensor outputting a first Hall voltage within the changing magnetic field; acquiring a first maximum voltage value of the first Hall voltage; determining a first peak voltage based on the first maximum voltage value; and driving the rotor to move axially along the axis of the axial flux motor based on the first peak voltage.

[0007] In this application, determining whether the first air gap is within a preset value or preset range based on the first peak voltage facilitates the detection and balancing of the air gap between the stator and rotor. Furthermore, using a Hall sensor to detect the air gap in real time allows for real-time monitoring of the air gap during the operation of the axial flux motor. When the actual axial dimension of the air gap deviates significantly from the preset value, the axial dimension of the air gap can be adjusted by axially moving the rotor, thereby improving the accuracy of the axial dimension of the air gap. This reduces the risks of power reduction, increased power consumption, increased temperature, and bearing damage caused by large air gap deviations.

[0008] In some possible designs, driving the rotor to move axially along the axial flux motor based on the first peak voltage includes: obtaining the difference between the absolute value of the first peak voltage and a comparison voltage value, and driving the rotor to move axially based on the difference.

[0009] In this application, the rotor is moved according to the difference between the first peak voltage and the comparison voltage value. The first air gap can be directly adjusted according to the first Hall voltage output by the first Hall sensor, which simplifies the difficulty and steps of detecting and balancing the first air gap.

[0010] In some possible designs, the rotor is driven to move axially based on the difference, including: when the difference is greater than a preset value σ, comparing the absolute value of a first peak voltage with a comparison voltage value; when the absolute value of the first peak voltage is greater than the comparison voltage value, driving the rotor axially away from the first stator; when the absolute value of the first peak voltage is less than the comparison voltage value, driving the rotor axially closer to the first stator.

[0011] In this application, the preset value σ can be flexibly set according to the specific accuracy of the axial flux motor. The preset value σ is used to determine whether the rotor needs to be moved, so that the axial flux motor has an appropriate air gap balancing accuracy under different usage scenarios and usage accuracy.

[0012] In some possible designs, the axial flux motor includes a second stator and a second Hall sensor disposed on the second stator and facing the rotor. After the rotor rotates, the air gap balancing method includes: the second Hall sensor outputting a second Hall voltage within a changing magnetic field, and acquiring a second maximum voltage value of the second Hall voltage. A second peak voltage is determined based on the second maximum voltage value, and the second peak voltage is used as a comparison voltage value.

[0013] In this application, when a first stator and a second stator are respectively provided on both sides of the rotor, the output voltage of the second Hall sensor is used as the comparison voltage to realize the automatic balancing of the first air gap and the second air gap on both sides of the rotor, so that the first air gap between the rotor and the first stator and the second air gap between the rotor and the second stator are both kept within a preset range.

[0014] In some possible designs, the axial flux motor has multiple second Hall sensors that are spaced apart along the circumferential direction of the first stator. The determination of the second peak voltage based on the second maximum voltage value includes: calculating a second average value based on the second maximum voltage value of each second Hall sensor, where the second average value is the second peak voltage.

[0015] In this application, the axial flux motor is equipped with a plurality of second Hall sensors that are spaced apart along the circumferential direction of the first stator. The second average value of the second maximum voltage is used as the second peak voltage, which can improve the detection accuracy and balancing accuracy of the first air gap and the second air gap.

[0016] In some possible designs, driving the rotor to move axially based on the first peak voltage includes: determining the actual first air gap between the rotor and the first stator based on the first peak voltage, and moving the rotor based on the difference between the actual first air gap and the target first air gap.

[0017] In this application, the actual size of the first air gap is determined directly based on the first peak voltage, and then the first air gap is adjusted, which can improve the detection accuracy and balancing accuracy of the first air gap.

[0018] In some possible designs, before the first Hall sensor outputs the first Hall voltage, the air gap balancing method further includes: selecting a calibration motor, which includes a calibration rotor, a calibration stator, and a calibration Hall sensor. The calibration rotor is rotated to generate a changing magnetic field. At least two calibration points are selected along the axial direction. The calibration air gap and the calibration Hall voltage output by the calibration Hall sensor are measured at each calibration point, where the calibration air gap is the axial distance between the calibration rotor and the calibration stator. The maximum calibration voltage value of the calibration Hall voltage corresponding to each calibration point is obtained. The calibration peak voltage corresponding to each calibration point is determined based on the maximum calibration voltage value. A mapping table between the peak voltage and the air gap is constructed based on the peak voltage and the calibration air gap corresponding to each calibration point. The actual first air gap between the rotor and the first stator is confirmed based on the first peak voltage, including: comparing the first peak voltage with the peak voltage in the mapping table, where the air gap corresponding to the first peak voltage in the mapping table is the actual first air gap.

[0019] In this application, a mapping table between the peak voltage output by the Hall sensor and the air gap is first established. The actual first air gap can be directly obtained based on the first peak voltage of the first Hall sensor through the mapping table, thereby reducing the measurement difficulty of the actual first air gap and improving the measurement accuracy of the actual first air gap.

[0020] In some possible designs, the axial flux motor has multiple first Hall sensors that are spaced apart along the circumferential direction of the first stator. Determining a first peak voltage based on a first maximum voltage value includes: calculating a first average value based on the first maximum voltage value of each first Hall sensor, where the first average value is the first peak voltage.

[0021] In this application, the axial flux motor is provided with a plurality of first Hall sensors spaced apart along the circumferential direction of the first stator, and the first average value of the first maximum voltage is used as the first peak voltage. x This can improve the detection accuracy and balancing accuracy of the first air gap.

[0022] In some possible designs, the axial flux motor also includes a first adjusting member, a rotating shaft, and a second adjusting member, with the rotor mounted on the rotating shaft. Driving the rotor to move axially includes: rotating the first adjusting member and the second adjusting member, and the first adjusting member and the second adjusting member pushing the rotating shaft and the rotor to move axially.

[0023] In this application, the first and second adjusting members are moved axially to drive the first bearing, the shaft, the rotor, and the second bearing to move synchronously along the axial direction, thereby adjusting the axial dimension of the air gap. This can improve the accuracy of the axial dimension of the air gap, thereby reducing the risks of power reduction, power consumption increase, temperature rise, and bearing damage caused by large air gap deviations.

[0024] In some possible designs, the axial flux motor also includes a first drive member and a second drive member, and rotates the first adjustment member and the second adjustment member, including: the first drive member drives the first adjustment member to rotate, and the second drive member drives the second adjustment member to rotate.

[0025] In this application, the rotation of the first adjusting member is controlled by the first driving member, and the rotation of the second adjusting member is controlled by the second driving member. This reduces the difficulty of air gap adjustment and allows for precise control of the rotation angle and number of turns of the first and second adjusting members, thereby improving the accuracy of air gap adjustment.

[0026] A second aspect of this application provides an axial flux motor, including a housing assembly, a rotating shaft, a first Hall sensor, a first adjusting member, and a second adjusting member. A first stator is mounted on the housing assembly, and a rotor is mounted on the rotating shaft. A first bearing and a second bearing are respectively connected to both ends of the rotating shaft along its axial direction. Along the axial direction, the first Hall sensor is disposed on the first stator and faces the rotor, and is used to output a first Hall voltage. The first adjusting member is connected to the first bearing and is axially movably mounted on the housing assembly. The second adjusting member is also axially movably mounted on the housing assembly. The first and second adjusting members are used to drive the first bearing, the rotating shaft, the rotor, and the second bearing to move axially according to a first maximum voltage value of the first Hall voltage.

[0027] In this application, a first Hall sensor is provided to facilitate the detection and balancing of the air gap between the stator and the rotor. When the actual size of the air gap in the axial direction deviates significantly from the preset value, the axial dimension of the air gap can be adjusted by axially moving the rotor, thereby improving the accuracy of the axial dimension of the air gap and reducing the risks of power reduction, power consumption increase, temperature rise, and bearing damage caused by large air gap deviations.

[0028] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 A schematic diagram of the axial flux motor provided in this application in some embodiments; Figure 2 for Figure 1 Exploded view of the axial flux motor in some embodiments; Figure 3 for Figure 1 Cross-sectional view of an axial flux motor in some embodiments; Figure 4 for Figure 3 A partial structural diagram of the axial flux motor at the first adjusting component; Figure 5 for Figure 2 Enlarged structural view of the first locking element and the first adjusting element in the middle; Figure 6 for Figure 1 Left view of the axial flux motor in the image; Figure 7 for Figure 6 Enlarged view of section A; Figure 8 Schematic diagrams of the axial flux motor provided in this application in other embodiments; Figure 9 for Figure 3 A partial structural diagram of the axial flux motor at the second adjusting component; Figure 10 for Figure 1 A cross-sectional view of the axial flux motor in some other embodiments; Figure 11 for Figure 10 Enlarged view of the structure of section B; Figure 12 A schematic diagram of the axial flux motor provided in this application in some other embodiments; Figure 13 for Figure 1 Exploded view of the axial flux motor in some other embodiments; Figure 14 for Figure 13 Cross-sectional view of an axial flux motor in some embodiments; Figure 15 for Figure 14A schematic diagram of the detection principle of the first Hall sensor in the diagram; Figure 16 for Figure 14 The graph shows the first Hall voltage and the second Hall voltage output by the first Hall sensor and the second Hall sensor in the image.

[0031] Figure label: 1-Housing assembly; 11-Outer shell; 12-First end cover; 13-Second end cover; 2-Shaft; 21-Central shaft; 22-First bearing; 23-Second bearing; 24-First shoulder; 25-First retaining ring; 26-Second shoulder; 27-Second retaining ring; 3-Stator; 31-First stator; 311-First Hall sensor; 32-Second stator; 321-Second Hall sensor; 4-Rotor; 5-First adjusting component; 51-Cover plate; 52-First mating part; 6-Second adjusting element; 61-Elastic element; 7-First locking element; 71-First locking part; 8-First driving component; 81-First transmission module; 9-Second locking element; 10-Second driving element; 101-Second transmission module. Detailed Implementation

[0032] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0033] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0034] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0035] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0036] This application provides an axial flux motor. Figure 1This is a schematic diagram of the structure of an axial flux motor in some embodiments. Figure 2 for Figure 1 Exploded views of axial flux motors in some embodiments. For example... Figure 1 and Figure 2 As shown, the axial flux motor includes a housing assembly 1 and a rotating shaft 2 mounted on the housing assembly 1. The housing assembly 1 has a mounting cavity, a portion of the rotating shaft 2 is located in the mounting cavity, and another portion of the rotating shaft 2 can extend along the axial direction X to the outside of the housing assembly 1. The portion of the rotating shaft 2 extending to the outside of the housing assembly 1 can be connected to a load such as a hub, a robotic arm, or a compressor.

[0037] Figure 3 for Figure 1 A cross-sectional view of an axial flux motor in some embodiments. For example... Figure 2 and Figure 3 As shown, the rotating shaft 2 has a first bearing 22 and a second bearing 23 connected to its two sides along the axial direction X. The rotating shaft 2 is connected to the housing assembly 1 through the first bearing 22 and the second bearing 23, allowing the rotating shaft 2 to rotate relative to the housing assembly 1 around the central axis 21. The fixing structure of the first bearing 22 and the second bearing 23 will be discussed in detail below, and will not be repeated here.

[0038] The housing assembly 1 includes an outer shell 11 and a first end cover 12 and a second end cover 13 located on both sides of the outer shell 11 along the axial direction X. The first end cover 12 and the second end cover 13 are detachably mounted on the outer shell 11, and the outer shell 11, the first end cover 12 and the second end cover 13 form the aforementioned mounting cavity.

[0039] By constructing the housing assembly 1 as a detachable outer shell 11, a first end cover 12, and a second end cover 13, the installation, replacement, and debugging of parts within the mounting cavity can be reduced, thereby reducing the difficulty of assembling and debugging the axial flux motor.

[0040] like Figure 2 and Figure 3 As shown, the axial flux motor also includes a stator 3 and a rotor 4 arranged along the axial direction X. The stator 3 is mounted on the housing assembly 1. For example, the stator 3 is fixed on the first end cover 12 and the second end cover 13. The rotor 4 is mounted on the rotating shaft 2. The rotating magnetic field generated by the stator 3 interacts with the magnetic field of the permanent magnet on the rotor 4, thereby driving the rotor 4 and the rotating shaft 2 to rotate synchronously around the central axis 21 of the rotating shaft 2.

[0041] The stator 3 and the housing assembly 1 can be fixed by means of bonding, welding, riveting, snap-fitting, fastener connection, bracket fixing, etc. The fasteners can be screws, bolts, pins, nuts, etc. The embodiments of this application do not impose special limitations on the fixing method of the stator 3 and the housing assembly 1.

[0042] The rotor 4 and the shaft 2 can be fixed by bonding, welding, riveting, snap-fitting, fastener connection, etc. The fasteners can be screws, bolts, pins, nuts, etc. The embodiments of this application do not impose special limitations on the fixing method of the rotor 4 and the shaft 2.

[0043] The number of stators 3 can be one, two, three or even more, and the number of rotors 4 can be one, two, three or even more. This application embodiment does not impose any special limitation on the number of stators 3 and rotors 4. Figure 2 and Figure 3 The example shows two stators 3 and one rotor 4. In this case, the rotor 4 is located between two adjacent stators 3. When the number of stators 3 and rotors 4 is not less than two, the stators 3 and rotors 4 can be arranged alternately along the axial X interval.

[0044] To improve the dimensional accuracy of the air gap between stator 3 and rotor 4 in the axial X direction, such as Figure 2 and Figure 3 As shown, the axial flux motor also includes a first adjusting member 5 and a second adjusting member 6. The first adjusting member 5 is connected to the first bearing 22. The first adjusting member 5 is movably mounted on the housing assembly 1 along the axial direction X. The second adjusting member 6 is movably mounted on the housing assembly 1 along the axial direction X. The first adjusting member 5 and the second adjusting member 6 are used to push the first bearing 22, the rotor 4 and the second bearing 23 to move along the axial direction X.

[0045] In this embodiment, during the assembly, use, and maintenance of the axial flux motor, the air gap between the stator 3 and the rotor 4 can be detected. When the actual size of the air gap in the axial direction X deviates significantly from the preset value, the first adjusting member 5 and the second adjusting member 6 can be moved axially in the X direction to drive the first bearing 22, the shaft 2, the rotor 4, and the second bearing 23 to move synchronously in the X direction, thereby adjusting the axial size of the air gap. This can improve the accuracy of the axial size of the air gap and reduce the risks of power reduction, power consumption increase, temperature increase, and bearing damage caused by large air gap deviations.

[0046] The relevant structure of the first adjusting element 5 is discussed in detail below.

[0047] Figure 4 for Figure 3 A partial structural diagram of the axial flux motor at the first adjusting member 5. (See diagram below.) Figure 4 As shown, a first retaining ring 25 is fitted on the rotating shaft 2. The first retaining ring 25 and the first shoulder 24 of the rotating shaft 2 are spaced apart along the axial direction X. The inner ring of the first bearing 22 is located between the first shoulder 24 and the first retaining ring 25. That is, the inner ring of the first bearing 22 is clamped and fixed by the first shoulder 24 and the first retaining ring 25 in the axial direction X.

[0048] The first retaining ring 25 can be fixed to the rotating shaft 2 by means of bonding, welding, riveting, snap-fitting, interference fit, etc. This embodiment does not impose any special limitation on the fixing method of the first retaining ring 25 and the rotating shaft 2. In this embodiment, the rotating shaft 2 is provided with a mounting groove, and the first retaining ring 25 is installed in the mounting groove, which can improve the connection stability between the first retaining ring 25 and the rotating shaft 2.

[0049] The outer ring of the first bearing 22 is connected and fixed to the first adjusting member 5. For example... Figure 4 As shown, the outer ring of the first bearing 22 abuts against the first adjusting member 5 in the axial direction X and in the radial direction Z of the rotating shaft 2. A cover plate 51 is installed on the first adjusting member 5, and the outer ring of the first bearing 22 is clamped and fixed in the axial direction X by the first adjusting member 5 and the cover plate 51.

[0050] The first adjusting member 5 is threadedly connected to the housing assembly 1. For example, the first adjusting member 5 is threadedly connected to the first end cover 12. The first adjusting member 5 can rotate around the central axis 21 so that the first adjusting member 5 moves along the axial direction X, thereby driving the first bearing 22 and the rotating shaft 2 to move synchronously along the axial direction X.

[0051] In this embodiment, the threaded connection between the first adjusting member 5 and the first end cover 12 simplifies the fixing method between the first adjusting member 5 and the housing assembly 1, thereby simplifying the installation difficulty of the first adjusting member 5 and shortening the installation cycle. Furthermore, the threaded connection between the first adjusting member 5 and the first end cover 12 allows for axial X-axis movement while the first adjusting member 5 rotates. Adjusting the air gap only requires rotating the first adjusting member 5, simplifying the air gap adjustment operation and reducing its difficulty and cycle. The threaded connection between the first adjusting member 5 and the first end cover 12 converts the rotation of the first adjusting member 5 around the central axis 21 into axial X-axis movement, transforming a large angular displacement input into a small and controllable linear displacement output. This improves the control accuracy of the first adjusting member 5's axial X-axis movement distance, thereby enhancing the accuracy of air gap size adjustment and further improving the dimensional accuracy of the air gap in the axial X direction.

[0052] The rotation of the first adjusting member 5 around the central axis 21 can be manually controlled by the operator or automatically controlled by the driving member.

[0053] When the rotation of the first adjusting element 5 is manually controlled by the operator, such as Figure 2 and Figure 3 As shown, the axial flux motor also includes a first locking element 7. Figure 5 for Figure 2 Enlarged view of the structure of the first locking member 7 and the first adjusting member 5. Figure 6 for Figure 1 Left view of the axial flux motor in the image. Figure 7 for Figure 6 An enlarged view of part A, as shown below. Figure 5 and Figure 7 As shown, the first locking member 7 has a first locking part 71, and the first adjusting member 5 has a first mating part 52. The first locking part 71 can abut against the first mating part 52 in the rotation direction of the first adjusting member 5.

[0054] In this embodiment, the first locking member 7 can restrict the rotation of the first adjusting member 5 around the central axis 21, which can reduce the risk of air gap changes caused by the rotation of the first adjusting member 5 due to vibration or external force.

[0055] The first locking member 7 is detachably mounted on the housing assembly 1, for example, the first locking member 7 is detachably mounted on the first end cover 12. When it is necessary to adjust the air gap, the first locking member 7 can be removed from the first end cover 12 to remove the restriction of the first locking member 7 on the rotation of the first adjusting member 5. After the air gap adjustment is completed, the first locking member 7 can be installed on the first end cover 12 to restrict the rotation of the first adjusting member 5.

[0056] In this embodiment, the detachable connection between the first locking member 7 and the first end cap 12 facilitates the adjustment and maintenance of the air gap.

[0057] When the rotation of the first adjusting element 5 is automatically controlled by the driving element, Figure 8 This is a schematic diagram of the structure of an axial flux motor in some other embodiments, such as... Figure 8 As shown, the axial flux motor also includes a first driving member 8, which is connected to the first adjusting member 5. The first driving member 8 can drive the first adjusting member 5 to rotate around the central axis 21.

[0058] In this embodiment, the first driving component 8 controls the rotation of the first adjusting component 5, which can reduce the difficulty of air gap adjustment. The first driving component 8 can also precisely control the rotation angle and number of turns of the first adjusting component 5, thereby improving the accuracy of air gap adjustment.

[0059] The first drive component 8 can be installed on the housing assembly 1, for example, the first drive component 8 can be installed on the first end cover 12.

[0060] The operation or cessation of the first driving component 8 can be manually controlled by the operator based on the measurement results of the air gap, or it can be automatically controlled by the control system based on the measurement results of the air gap. The measurement of the air gap will be discussed in detail below and will not be repeated here.

[0061] The first driving component 8 can be a motor, electric motor, etc. The embodiments of this application do not impose any special limitations on the specific type, structure, etc. of the first driving component 8.

[0062] The first driving component 8 can be directly connected to the first adjusting component 5, or it can be indirectly connected through other transmission modules.

[0063] like Figure 8 As shown, the axial flux motor also includes a first transmission module 81. The first driving component 8 and the first adjusting component 5 are connected through the first transmission module 81, which can increase the flexibility of the setting position of the first driving component 8, thereby reducing the difficulty of connecting the first driving component 8 and the first adjusting component 5.

[0064] The first transmission module 81 may include gears, worm gears, connecting rods, cams, etc. The specific structure of the first transmission module 81 is not specifically limited in the embodiments of this application.

[0065] In some embodiments, the first transmission module 81 includes at least a first gear, which is connected to the first driving member 8 and meshes with the first adjusting member 5. The first driving member 8 can drive the first gear to rotate, and the rotation of the first gear can drive the first adjusting member 5 meshing with it to rotate. Gear transmission can simplify the structure of the first transmission module 81 and reduce the space occupied by the first transmission module 81, which is beneficial to reducing the overall size of the axial flux motor.

[0066] In some other embodiments, the first transmission module 81 includes at least a first worm gear, which is connected to the first driving member 8 and meshes with the first adjusting member 5. The first worm gear and the first adjusting member 5 form a worm gear structure. By adjusting the parameters of the first worm gear, the lead angle of the first worm gear is made smaller than the equivalent friction angle of the meshing surface of the first worm gear, so that the worm gear structure formed by the first worm gear and the first adjusting member 5 has a self-locking function.

[0067] In this embodiment, the first driving member 8 can drive the first worm to rotate, and the rotation of the first worm drives the first adjusting member 5 to rotate at the same time. However, the first adjusting member 5 cannot drive the first worm to rotate in the opposite direction. The worm gear structure with self-locking function can limit the rotation of the first adjusting member 5 around the central axis 21, which can reduce the risk of air gap changes caused by the rotation of the first adjusting member 5 due to vibration or external force.

[0068] In some other embodiments, the first drive member 8 includes a first output shaft and a first brake. The first output shaft is connected to the first adjusting member 5. The first output shaft and the first adjusting member 5 can be directly connected or connected through the first transmission module 81 in the above embodiments. The first brake can lock the first output shaft, so that the first drive member 8 has a self-locking function.

[0069] In this embodiment, the first drive member 8 with a self-locking function can limit the rotation of the first adjustment member 5 around the central axis 21, which can reduce the risk of air gap changes caused by the rotation of the first adjustment member 5 due to vibration or external force.

[0070] Based on the axial flux motor in any of the above embodiments, the relevant structure of the second adjusting member 6 will be discussed in detail below.

[0071] Figure 9 for Figure 3 A partial structural diagram of the axial flux motor at the second adjusting component is shown below. Please also refer to... Figure 2 and Figure 9 A second retaining ring 27 is fitted on the rotating shaft 2. The second retaining ring 27 and the second shoulder 26 of the rotating shaft 2 are spaced apart along the axial direction X. The inner ring of the second bearing 23 is located between the second shoulder 26 and the second retaining ring 27. That is, the inner ring of the second bearing 23 is clamped and fixed by the second shoulder 26 and the second retaining ring 27 in the axial direction X.

[0072] The second retaining ring 27 can be fixed to the rotating shaft 2 by means of bonding, welding, riveting, snap-fitting, interference fit, etc. This embodiment does not impose any special limitation on the fixing method of the second retaining ring 27 and the rotating shaft 2. In this embodiment, the rotating shaft 2 is provided with a mounting groove, and the second retaining ring 27 is installed in the mounting groove, which can improve the connection stability between the second retaining ring 27 and the rotating shaft 2.

[0073] The outer ring of the second bearing 23 can contact the housing assembly 1 in the radial direction Z of the rotating shaft 2, or it can contact the second adjusting member 6 in the radial direction Z of the rotating shaft 2. Figure 2 and Figure 9 The example shows the second adjusting member 6 mounted on the second end cover 13, with the outer ring of the second bearing 23 contacting the second adjusting member 6 in the radial direction Z of the rotating shaft 2, such that the second bearing 23 is connected to the second adjusting member 6, that is, the second bearing 23 is indirectly connected to the housing assembly 1 through the second adjusting member 6.

[0074] In this embodiment, the outer ring of the second bearing 23 is connected to the second adjusting member 6, that is, the second bearing 23 is integrated into the second adjusting member 6, thereby reducing the space occupied by the second bearing 23 and the second adjusting member 6 in the axial X direction, which is beneficial to reducing the overall size of the axial flux motor in the axial X direction.

[0075] Figure 10 for Figure 1 A cross-sectional view of the axial flux motor in some other embodiments. Figure 11 for Figure 10 Enlarged view of the structure of section B. (See diagram below.) Figure 10 and Figure 11 As shown, the second bearing 23 and the second adjusting member 6 are arranged along the axial direction X. The second bearing 23 is mounted on the housing assembly 1, that is, in the radial direction Z. The second bearing 23 contacts the housing assembly 1. For example, the second bearing 23 contacts the second end cover 13 in the radial direction Z.

[0076] In this embodiment, the outer ring of the second bearing 23 is connected to the second end cover 13, which can reduce the size of the second adjusting member 6 in the radial Z and axial X directions, thereby reducing the cost of the second adjusting member 6 and reducing the impact of the assembly error between the second adjusting member 6 and the second end cover 13 on the assembly accuracy of the second bearing 23, thereby improving the working stability of the second bearing 23.

[0077] Based on the axial flux motor in any of the above embodiments, such as Figure 2 , Figure 9 and Figure 11 As shown, the axial flux motor also includes an elastic element 61, and in the axial direction X, the two ends of the elastic element 61 abut against the second bearing 23 and the second adjusting element 6, respectively.

[0078] In this embodiment, the elastic element 61 can directly press the second bearing 23 and indirectly press the first bearing 22 along the axial direction X. That is, the elastic element 61 can apply a preload to the first bearing 22 and the second bearing 23, which can reduce the impact of the gap between the rolling elements and raceways inside the first bearing 22 and the second bearing 23 on the stiffness and rotational accuracy. It can also reduce the noise and vibration of the first bearing 22 and the second bearing 23 during operation, which can help extend the service life of the first bearing 22 and the second bearing 23.

[0079] The elastic element 61 can be a wave spring, a butterfly spring, a helical spring, etc. The embodiments of this application do not impose any special limitations on the structure, type, etc. of the elastic element 61.

[0080] The second adjusting member 6 is threadedly connected to the housing assembly 1. For example, the second adjusting member 6 is threadedly connected to the second end cover 13. The second adjusting member 6 can rotate about the central axis 21 so that the second adjusting member 6 moves along the axial direction X, thereby pushing the elastic member 61, the second bearing 23 and the rotating shaft 2 to move synchronously along the axial direction X.

[0081] In this embodiment, the threaded connection between the second adjusting member 6 and the second end cover 13 simplifies the fixing method between the second adjusting member 6 and the housing assembly 1, thereby simplifying the installation difficulty of the second adjusting member 6 and shortening the installation cycle. Furthermore, the threaded connection between the second adjusting member 6 and the second end cover 13 allows for axial X-axis movement while the second adjusting member 6 rotates. Adjusting the air gap only requires rotating the second adjusting member 6, simplifying the air gap adjustment operation and reducing its difficulty and cycle. The threaded connection between the second adjusting member 6 and the second end cover 13 converts the rotation of the second adjusting member 6 around the central axis 21 into axial X-axis movement, transforming a large angular displacement input into a small and controllable linear displacement output. This improves the control accuracy of the movement distance of the second adjusting member 6 along the axial X-axis, thereby enhancing the accuracy of air gap size adjustment and further improving the dimensional accuracy of the air gap in the axial X-axis direction.

[0082] The rotation of the second adjusting member 6 around the central axis 21 can be manually controlled by the operator or automatically controlled by the driving member.

[0083] When the rotation of the second adjusting element 6 is manually controlled by the operator, such as Figure 2 , Figure 3 and Figure 11 As shown, the axial flux motor also includes a second locking member 9, which has a second locking part and a second adjusting member 6 having a second mating part. The second locking part can abut against the second mating part in the rotation direction of the second adjusting member. The relevant structures of the second locking member 9 and the second adjusting member 6 can refer to the relevant structures of the first locking member 7 and the first adjusting member 5 in the above embodiment.

[0084] In this embodiment, the second locking member 9 can restrict the rotation of the second adjusting member 6 around the central axis 21, which can reduce the risk of air gap changes caused by the rotation of the second adjusting member 6 due to vibration or external force.

[0085] The second locking element 9 is detachably mounted on the housing assembly 1. Refer to the relevant content of the first locking element 7; details will not be repeated here. The detachable connection between the second locking element 9 and the second end cover 13 facilitates the adjustment and maintenance of the air gap.

[0086] When the rotation of the second adjusting element 6 is automatically controlled by the driving element, Figure 12 Schematic diagrams of the axial flux motor provided in this application in some other embodiments, such as Figure 12 As shown, the axial flux motor also includes a second drive member 10, which is connected to the second adjustment member 6. The second drive member 10 can drive the second adjustment member 6 to rotate around the central axis 21.

[0087] In this embodiment, the second driving member 10 controls the rotation of the second adjusting member 6, which can reduce the difficulty of air gap adjustment. The second driving member 10 can also precisely control the rotation angle and number of turns of the second adjusting member 6, thereby improving the accuracy of air gap adjustment.

[0088] The second drive unit 10 can be mounted on the housing assembly 1, for example, the second drive unit 10 can be mounted on the second end cover 13.

[0089] The operation or shutdown of the second drive component 10 can be manually controlled by the operator based on the measurement results of the air gap, or it can be automatically controlled by the control system based on the measurement results of the air gap. The measurement of the air gap will be discussed in detail below and will not be repeated here.

[0090] The second driving component 10 can be a motor, electric motor, etc. The embodiments of this application do not impose any special limitations on the specific type, structure, etc. of the second driving component 10.

[0091] The second drive component 10 can be directly connected to the second adjustment component 6, or it can be indirectly connected through other transmission modules.

[0092] like Figure 12 As shown, the axial flux motor also includes a second transmission module 101. The second drive member 10 and the second adjustment member 6 are connected through the second transmission module 101, which can increase the flexibility of the setting position of the second drive member 10 and thus reduce the connection difficulty between the second drive member 10 and the second adjustment member 6.

[0093] The second transmission module 101 may include gears, worm gears, connecting rods, cams, etc. The specific structure of the second transmission module 101 is not specifically limited in the embodiments of this application.

[0094] In some embodiments, the second transmission module 101 includes at least a second gear, which is connected to the second drive member 10 and meshes with the second adjustment member 6. The second drive member 10 can drive the first gear to rotate, and the rotation of the first gear can drive the second adjustment member 6 meshing with it to rotate. Gear transmission can simplify the structure of the second transmission module 101 and reduce the space occupied by the second transmission module 101, which is beneficial to reducing the overall size of the axial flux motor.

[0095] In other embodiments, the second transmission module 101 includes at least a second worm gear, which is connected to the second drive member 10 and meshes with the second adjusting member 6. The second worm gear and the second adjusting member 6 form a worm gear structure. By adjusting the parameters of the second worm gear, the lead angle of the second worm gear is made smaller than the equivalent friction angle of the meshing surface of the second worm gear, so that the worm gear structure formed by the second worm gear and the second adjusting member 6 has a self-locking function. The worm gear structure with a self-locking function can limit the rotation of the second adjusting member 6 around the central axis 21, which can reduce the risk of air gap changes caused by the rotation of the second adjusting member 6 due to vibration or external force.

[0096] In some embodiments, the second transmission module 101 includes a second output shaft and a second brake. The second output shaft is connected to the second adjusting member 6. The second output shaft and the second adjusting member 6 can be directly connected, or they can be connected through the second transmission module 101 described in the above embodiments. The second brake can lock the second output shaft, giving the second driving member 10 a self-locking function. The second driving member 10 with the self-locking function can limit the rotation of the second adjusting member 6 around the central axis 21, reducing the risk of air gap changes caused by the rotation of the second adjusting member 6 due to vibration or external force.

[0097] Based on the axial flux motor in any of the above embodiments, Figure 13 for Figure 1 Exploded views of the axial flux motor in some other embodiments. Figure 14 for Figure 13A cross-sectional view of an axial flux motor in some embodiments. For example... Figure 13 and Figure 14 As shown, the stator 3 includes at least a first stator 31. In the axial direction X, the first stator 31 is located on one side of the rotor 4. The axial flux motor also includes a first Hall sensor 311. Along the axial direction X, the first Hall sensor 311 is mounted on the first stator 31, and the first Hall sensor 311 faces the rotor 4. The first Hall sensor 311 facing the rotor 4 means that in the axial direction X, the Hall element of the first Hall sensor 311 is located on the side of the first Hall sensor 311 facing the rotor 4. The first Hall sensor 311 is used to output a first Hall voltage.

[0098] Figure 15 for Figure 14 A schematic diagram of the detection principle of the first Hall sensor 311 in the diagram. (See diagram below.) Figure 15 As shown, the first Hall sensor 311 is connected to the positive and negative terminals of the power supply respectively. The power supply makes the Hall sensor 311 have a stable current. During the rotation of the rotor 4, the magnet of the rotor 4 will approach the first Hall sensor 311. The current originally flowing in the first Hall sensor 311 will be disturbed by the magnetic field of the magnet. The negatively charged electrons in the first Hall sensor 311 will be deflected to one side and the positively charged holes will be deflected to the other side. When the first Hall sensor 311 is perpendicular to the direction of the power supply current, the first Hall sensor 311 will establish a first Hall voltage V1.

[0099] V1 = R1 × (I × B / t), where R1 is the Hall effect coefficient of the Hall element of the first Hall sensor 311, I is the current flowing through the Hall sensor, i.e. the current output by the power supply, t is the thickness of the Hall element of the first Hall sensor 311, and B is the magnetic field strength passing through the Hall element of the first Hall sensor 311.

[0100] In this embodiment, when the rotor 4 rotates, the magnet of the rotor 4 periodically approaches, faces, and moves away from the first Hall sensor 311. When the magnet approaches the first Hall sensor 311, the detected first Hall voltage V1 continuously increases; when the magnet moves away from the first Hall sensor 311, the detected first Hall voltage V1 continuously decreases; and when the magnet faces the first Hall sensor 311, the detected first Hall voltage V1 is at its maximum. The waveform of the first Hall voltage V1 output by the first Hall sensor 311 is as follows: Figure 16 As shown, Figure 16The waveform of the first Hall voltage V1 is illustrated by a dotted line. Therefore, the distance between the rotor 4 and the first Hall sensor 311 in the axial direction X can be determined based on the maximum value of the first Hall voltage V1 output by the first Hall sensor 311. Then, the first air gap between the rotor 4 and the first stator 31 can be measured based on the distance between the Hall element on the first Hall sensor 311 and the first stator 31 in the axial direction X. This is then used to determine whether the first air gap needs to be adjusted. If the first air gap needs to be adjusted, the first adjusting member 5 and the second adjusting member 6 in the above embodiment push the first bearing 22, the shaft 2, the rotor 4 and the second bearing 23 to move along the axial direction X, thereby achieving automatic balancing of the air gap between the stator 3 and the rotor 4.

[0101] The air gap balancing method for axial flux motors is discussed in detail below.

[0102] The air gap balancing method provided in this application includes: S1: Rotate rotor 4 to generate a changing magnetic field. Before the axial flux motor is assembled, rotor 4 can be rotated manually. After the axial flux motor is assembled, the first stator 31 can be energized to rotate rotor 4.

[0103] S2: The first Hall sensor 311 in the changing magnetic field outputs the first Hall voltage and obtains the first maximum voltage value of the first Hall voltage.

[0104] S3: Determine the first peak voltage V based on the first maximum voltage value. 1max .

[0105] S4: Based on the first peak voltage V 1max The rotor 4 is driven to move along the axial direction X. The operation of driving the rotor 4 can be done manually or through a driving mechanism, as described in the above embodiments. The specific driving method of the rotor 4 will be discussed in detail below and will not be repeated here.

[0106] In this embodiment, based on the first peak voltage V 1max To determine whether the first air gap is within a preset value or range, it is convenient to detect and balance the air gap between the stator 3 and the rotor 4. Furthermore, by using a Hall sensor to detect the air gap in real time, the air gap during the operation of the axial flux motor can be monitored in real time. When the actual size of the air gap in the axial direction X deviates significantly from the preset value, the rotor 4 can be moved in the axial direction X to adjust the axial size of the air gap. This can improve the accuracy of the axial size of the air gap, thereby reducing the risks of power reduction, increased power consumption, increased temperature, and bearing damage caused by large air gap deviations.

[0107] The number of first Hall sensors 311 can be one or more.

[0108] When there is only one first Hall sensor 311, the first maximum voltage value is the first peak voltage V. 1max .

[0109] In this embodiment, the axial flux motor is equipped with a first Hall sensor 311, which can reduce the cost of the first Hall sensor 311.

[0110] When there are multiple first Hall sensors 311, the multiple first Hall sensors 311 are distributed at intervals along the circumferential direction of the first stator 31. At this time, the above step S3 includes: S31: Calculate the first average value based on the first maximum voltage value of each first Hall sensor 311. The first average value is the first peak voltage V. 1max .

[0111] In this embodiment, the axial flux motor is provided with a plurality of first Hall sensors 311 spaced apart along the circumferential direction of the first stator 31, and the first average value of the first maximum voltage is used as the first peak voltage V. 1max This can improve the detection accuracy and balancing accuracy of the first air gap.

[0112] In step S4 above, the first peak voltage V can be compared. 1max By comparing the voltage values, the rotor 4 is moved according to the difference between the two values ​​to adjust the difference to a preset range, thereby adjusting the first air gap. Alternatively, in step S4 above, the first peak voltage V can be used as the reference. 1max The actual size of the first air gap is determined directly, and then the actual first air gap is compared with the target first air gap. The rotor 4 is moved according to the relationship or difference between the two, thereby achieving the adjustment of the first air gap. The relevant air gap balancing methods are discussed below for these two cases.

[0113] In this embodiment, based on the first peak voltage V 1max The rotor 4 moves according to the difference between the comparison voltage values, and the first air gap can be directly adjusted according to the first Hall voltage output by the first Hall sensor 311, which simplifies the difficulty and steps of detecting and balancing the first air gap.

[0114] First, based on the first peak voltage V 1max By directly determining the actual size of the first air gap and then adjusting it, the detection accuracy and balancing accuracy of the first air gap can be improved.

[0115] According to the first peak voltage V 1max When moving rotor 4 according to the difference between the comparison voltage values, the above step S4 includes: S41: Obtain the first peak voltage V 1maxThe difference between the absolute value of the voltage and the comparison voltage value is used to drive the rotor 4 to move along the axial direction X.

[0116] The mechanism that drives rotor 4 to move along the axial direction X based on the difference includes: When the difference is greater than the preset value σ, compare it with the first peak voltage V. 1max The absolute value and the comparison voltage value; S411: First peak voltage V 1max When the absolute value is greater than the comparison voltage value, the drive rotor 4 moves away from the first stator 31 along the axial direction X.

[0117] S412: First peak voltage V 1max When the absolute value is less than the comparison voltage value, the drive rotor 4 moves along the axial direction X towards the first stator 31.

[0118] When the difference is less than the preset value σ, the first air gap is within the set standard range, which meets the usage requirements and does not require moving rotor 4.

[0119] The preset value σ can be flexibly set according to the specific accuracy of the axial flux motor. In this application embodiment, no special limitation is made on the specific value or range of the preset value σ.

[0120] In this embodiment, the need to move the rotor 4 is determined based on a preset value σ, so that the axial flux motor has an appropriate air gap balancing accuracy under different usage scenarios and usage precision.

[0121] The comparison voltage value can be a preset voltage value, such as a standard voltage value measured based on the air gap within a standard range. Alternatively, the comparison voltage value can be the Hall voltage value output by the Hall sensor on the other side of rotor 4.

[0122] In some embodiments, such as Figure 14 As shown, the axial flux motor includes a second stator 32 and a second Hall sensor 321 mounted on the second stator 32 and facing the rotor 4. After step S1 above, the air gap balancing method includes: S5: The second Hall sensor 321 outputs a second Hall voltage V2 within the changing magnetic field, and the second maximum voltage value of the second Hall voltage V2 is obtained. The detection principle of the second Hall sensor 321 can be referred to the relevant content of the first Hall sensor 311, and will not be repeated here. The waveform of the second Hall voltage V2 output by the second Hall sensor 321 is as follows: Figure 16 As shown, Figure 16 The waveform of the second Hall voltage V2 is illustrated by a dashed line.

[0123] S6: Determine the second peak voltage V based on the second maximum voltage value. 2max The second peak voltage V 2max For comparison of voltage values.

[0124] In this embodiment, step S5 can be after step S1 and before step S2, or after step S2 and before step S3, or after step S3 and before step S4. Similarly, step S6 can be after step S1 and before step S2, or after step S2 and before step S3, or after step S3 and before step S4. This embodiment does not impose any special restrictions on the order of step S5 with steps S2, S3, and S4, nor does it impose any special restrictions on the order of step S6 with steps S2, S3, and S4.

[0125] In this embodiment, when the first stator 31 and the second stator 32 are respectively provided on both sides of the rotor 4, the output voltage of the second Hall sensor 321 is used as the comparison voltage, which can realize the automatic balancing of the first air gap and the second air gap on both sides of the rotor 4, so that the first air gap between the rotor 4 and the first stator 31 and the second air gap between the rotor 4 and the second stator 32 are both kept within a preset range.

[0126] The number of second Hall sensors 321 can be one or more.

[0127] When there is only one second Hall sensor 321, the second maximum voltage value is the second peak voltage V. 2max .

[0128] In this embodiment, the axial flux motor is equipped with a second Hall sensor 321, which can reduce the cost of the second Hall sensor 321.

[0129] When there are multiple second Hall sensors 321, the multiple second Hall sensors 321 are distributed at intervals along the circumferential direction of the first stator 31. At this time, the above step S6 includes: S61: Calculate the second average value based on the second maximum voltage value of each second Hall sensor 321. The second average value is the second peak voltage V. 2max .

[0130] In this embodiment, the axial flux motor is provided with a plurality of second Hall sensors 321 spaced apart along the circumferential direction of the first stator 31, and the second average value of the second maximum voltage is used as the second peak voltage V. 2max This can improve the detection accuracy and balancing accuracy of the first and second air gaps.

[0131] First, based on the first peak voltage V 1max When directly determining the actual size of the first air gap and then adjusting the first air gap, step S4 above includes: S42: Based on the first peak voltage V 1maxConfirm the actual first air gap between rotor 4 and first stator 31.

[0132] S43: Drive the rotor to move along the axial direction X based on the difference between the actual first air gap and the target first air gap.

[0133] At this point, before step S2, the air gap balancing method also includes: S01: Select the calibration motor, which includes the calibration rotor, calibration stator, and calibration Hall sensor.

[0134] S02: Rotate the calibration rotor to generate a changing magnetic field.

[0135] S03: Select at least two calibration points along the axial direction X, and measure the calibration air gap and the calibration Hall voltage output by the calibration Hall sensor at each calibration point. The calibration air gap is the distance between the index stator / rotor and the calibration stator, and can be measured using a feeler gauge.

[0136] S04: Obtain the maximum calibration voltage value of the calibration Hall voltage corresponding to each calibration point.

[0137] S05: Determine the calibration peak voltage corresponding to each calibration point based on the calibration maximum voltage value corresponding to each calibration point.

[0138] S06: Construct a mathematical model between the peak voltage and the air gap based on the calibration peak voltage and calibration air gap corresponding to each calibration point. The mathematical model can be a table, curve, formula, etc. For example, construct a mapping table between the peak voltage and the air gap based on the calibration peak voltage and calibration air gap corresponding to each calibration point.

[0139] Step S42 above includes: S421: Convert the first peak voltage V 1max Compare the peak voltage with the peak voltage in the mapping table; the peak voltage V in the mapping table corresponds to the first peak voltage V. 1max The corresponding air gap is the actual first air gap.

[0140] In this embodiment, a mapping table between the peak voltage output by the Hall sensor and the air gap is first established. The actual first air gap can be directly obtained based on the first peak voltage of the first Hall sensor 311 through the mapping table, thereby reducing the measurement difficulty of the actual first air gap and improving the measurement accuracy of the actual first air gap.

[0141] Based on the air gap balancing method of the axial flux motor in any of the above embodiments, driving the rotor 4 to move along the axial direction X includes: S44: Rotate the first adjusting member 5 and the second adjusting member 6, and the first adjusting member 5 and the second adjusting member 6 push the rotating shaft 2 and the rotor 4 to move along the axial direction X.

[0142] The steps of rotating the first adjusting member 5 and the second adjusting member 6 can be performed manually by the operator or automatically controlled by the first driving member 8 and the second driving member 10 in the above embodiment.

[0143] Step S44 above includes: S441: The first driving component 8 drives the first adjusting component 5 to rotate.

[0144] S442: The second driving component 10 drives the second adjusting component 6 to rotate.

[0145] Steps S441 and S442 can be performed simultaneously, which facilitates the synchronous movement of the first adjusting member 5, the second adjusting member 6, the rotating shaft 2, and the rotor 4 along the axial direction X.

[0146] The axial flux motor may further include a control module, which is connected to the first Hall sensor 311, the second Hall sensor 321, the first drive element 8, and the second drive element 10 in the above embodiments. The connection method can be electrical or signal connection. The control module can control the first drive element 8 and the second drive element 10 to start or stop working based on the Hall voltage output by the first Hall sensor 311 and the second Hall sensor 321, and can also control the first drive element 8 and the second drive element 10 to work simultaneously and synchronously.

[0147] The first driving component 8 can directly drive the first adjusting component 5 to rotate, or it can drive the first adjusting component 5 to rotate through the transmission module. The second driving component 10 can directly drive the second adjusting component 6 to rotate, or it can drive the second adjusting component 6 to rotate through the transmission module.

[0148] For example, step S441 includes: S4411: The first driving component 8 drives the first transmission module 81 to rotate.

[0149] S4412: The first transmission module 81 drives the first adjusting component 5 to rotate.

[0150] Step S442 includes: S4421: The second driving component 10 drives the second transmission module 101 to rotate; S4421: The second transmission module 101 drives the second adjusting component 6 to rotate.

[0151] In summary, in the axial flux motor provided by this application, during assembly, after assembly, during use, and during debugging, the air gap between the stator 3 and the rotor 4 can be detected by a Hall sensor. For example, when the voltage difference between the Hall sensors on both sides of the rotor 4 is greater than a preset value, the first adjusting member 5 and the second adjusting member 6 can be rotated so that the first adjusting member 5 and the second adjusting member 6 move the same or similar distance in the axial direction X. For example, the first adjusting member 5 and the second adjusting member 6 can be rotated the same number of turns. Through the rotation of the first adjusting member 5 and the second adjusting member 6, the first bearing 22, the shaft 2, the rotor 4, and the second bearing 23 are pushed to move synchronously in the axial direction X, thereby making one of L1 and L2 larger and the other smaller, thereby realizing the adjustment of the air gap on both sides of the rotor 4 to improve the dimensional accuracy of the air gap.

[0152] After the air gap adjustment is completed, the rotation of the first adjusting member 5 and the second adjusting member 6 around the central axis 21 can be restricted by the first transmission module 81 and the second transmission module 101 with locking function, or by the first driving member 8 and the second driving member 10 with locking function, or by the first locking member 7 and the second locking member 9. This can reduce the risk of the first adjusting member 5 and the second adjusting member 6 rotating due to vibration or external force, thereby reducing the risk of changes in air gap and changes in the compression of elastic member 61 during the transportation and use of the axial flux motor.

[0153] The same or similar parts between the various embodiments in this specification can be referred to mutually. In particular, the device embodiments and terminal embodiments are basically similar to the method embodiments, so the description is relatively simple, and the relevant parts can be referred to the description in the method embodiments.

Claims

1. A method for air gap balancing of an axial flux motor, characterized in that, The axial flux motor includes a first stator, a rotor, and a first Hall sensor disposed on the first stator and facing the rotor; The air gap balancing method includes: Rotate the rotor to generate a changing magnetic field; The first Hall sensor in the changing magnetic field outputs a first Hall voltage, and the first maximum voltage value of the first Hall voltage is obtained; The first peak voltage is determined based on the first maximum voltage value; The rotor is driven to move axially along the axial flux motor according to the first peak voltage.

2. The air gap balancing method for an axial flux motor according to claim 1, characterized in that, Driving the rotor to move axially along the axial flux motor according to the first peak voltage includes: The difference between the absolute value of the first peak voltage and the comparison voltage value is obtained, and the rotor is driven to move along the axial direction based on the difference.

3. The air gap balancing method for an axial flux motor according to claim 2, characterized in that, Driving the rotor to move axially along the axial flux motor based on the difference includes: When the difference is greater than a preset value, the absolute value of the first peak voltage is compared with the comparison voltage value; When the absolute value of the first peak voltage is greater than the comparison voltage value, the rotor is driven to move away from the first stator along the axial direction; When the absolute value of the first peak voltage is less than the comparison voltage value, the rotor is driven to move closer to the first stator along the axial direction.

4. The air gap balancing method for an axial flux motor according to claim 3, characterized in that, The axial flux motor includes a second stator and a second Hall sensor disposed on the second stator and facing the rotor; After rotating the rotor, the air gap balancing method further includes: The second Hall sensor in the changing magnetic field outputs a second Hall voltage, and the second maximum voltage value of the second Hall voltage is obtained; The second peak voltage is determined based on the second maximum voltage value, and the second peak voltage is the comparison voltage value.

5. The air gap balancing method for an axial flux motor according to claim 4, characterized in that, The axial flux motor has a plurality of second Hall sensors, which are spaced apart along the circumferential direction of the first stator. Determining the second peak voltage based on the second maximum voltage value includes: A second average value is calculated based on the second maximum voltage value of each of the second Hall sensors, and the second average value is the second peak voltage.

6. The air gap balancing method for an axial flux motor according to claim 1, characterized in that, Driving the rotor to move along the axial direction according to the first peak voltage includes: The actual first air gap between the rotor and the first stator is confirmed based on the first peak voltage. The rotor is driven to move along the axial direction based on the difference between the actual first air gap and the target first air gap.

7. The air gap balancing method for an axial flux motor according to claim 6, characterized in that, Before the first Hall sensor outputs the first Hall voltage, the air gap balancing method further includes: A calibration motor is selected, the calibration motor including a calibration rotor, a calibration stator and a calibration Hall sensor; Rotate the calibrated rotor to generate a changing magnetic field; At least two calibration points are selected along the axial direction, and the calibration air gap corresponding to each calibration point and the calibration Hall voltage output by the calibration Hall sensor are measured. Obtain the maximum calibrated voltage value of the calibrated Hall voltage corresponding to each calibration point; The calibration peak voltage corresponding to each calibration point is determined based on the calibration maximum voltage value corresponding to each calibration point; A mapping table between peak voltage and air gap is constructed based on the calibration peak voltage and calibration air gap corresponding to each calibration point; Determining the actual first air gap between the rotor and the first stator based on the first peak voltage includes: The first peak voltage is compared with the peak voltage in the mapping table, and the air gap corresponding to the first peak voltage in the mapping table is the actual first air gap.

8. The air gap balancing method for an axial flux motor according to any one of claims 1 to 7, characterized in that, The axial flux motor has a plurality of first Hall sensors, which are spaced apart along the circumferential direction of the first stator. Determining the first peak voltage based on the first maximum voltage value includes: A first average value is calculated based on the first maximum voltage value of each of the first Hall sensors, and the first average value is the first peak voltage.

9. The air gap balancing method for an axial flux motor according to any one of claims 1 to 7, characterized in that, The axial flux motor further includes a first adjusting component, a rotating shaft, and a second adjusting component, with the rotor mounted on the rotating shaft; Driving the rotor to move along the axial direction includes: Rotating the first adjusting member and the second adjusting member causes the first adjusting member and the second adjusting member to push the rotating shaft and the rotor to move along the axial direction.

10. The air gap balancing method for an axial flux motor according to claim 9, characterized in that, The axial flux motor further includes a first driving element and a second driving element; Rotating the first adjusting member and the second adjusting member includes: The first driving member drives the first adjusting member to rotate, and the second driving member drives the second adjusting member to rotate.

11. An axial flux motor, characterized in that, The axial flux motor includes: A housing assembly on which a first stator is mounted; A rotating shaft on which a rotor is mounted, and a first bearing and a second bearing are respectively connected to both ends of the rotating shaft along its axial direction. A first Hall sensor, along the axial direction, is disposed on the first stator and faces the rotor, and is used to output a first Hall voltage; A first adjusting member is connected to the first bearing and is movably mounted on the housing assembly along the axial direction. A second adjusting member is movably mounted on the housing assembly along the axial direction. The first adjusting member and the second adjusting member are used to push the first bearing, the shaft, the rotor, and the second bearing along the axial direction according to a first maximum voltage value of the first Hall voltage.

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