Axial flux electric machine and method for axial flux electric machine

Abstract

This invention provides an axial flux motor, comprising: a first rotor; a second rotor; and a stator located between the first rotor and the second rotor; wherein the first rotor includes a first set of magnets, and the second rotor includes a second set of magnets, wherein the surfaces of the first set of magnets and the second set of magnets are roughened to make the surfaces rough. Furthermore, this invention also provides a method for using the axial flux motor. Through this invention, the heat dissipation problem of the axial flux motor can be effectively solved, thereby significantly improving the heat dissipation efficiency of the axial flux motor, reducing the operating temperature of the axial flux motor, and extending the service life of the axial flux motor.

Description

Technical Field

[0001] This invention relates to electric motors, and more particularly, to axial flux motors and methods for using axial flux motors. Background Technology

[0002] Currently, most OEMs use radial flux motors (RFM) in the electric drive systems of new energy vehicles. However, RFM technology has encountered bottlenecks in improving power density, torque density, and volume density. An innovative approach is to utilize axial flux motors (AFM) to address this issue.

[0003] Compared to RFM (Radio Frequency Modulation), AFM (Automotive Frequency Modulation) offers many advantages for electric vehicle design. For example, AFM can alter the design of the powertrain, move the motor from the axle to inside the wheel, provide greater torque, and reduce weight. However, existing AFMs cause high temperatures at the rotor containing magnets during high-power operation. This high temperature can lead to a decrease in motor performance (power) or demagnetization of the magnets, resulting in motor failure and consequently, vehicle malfunction. Traditional cooling technologies are also ineffective.

[0004] Accordingly, there is a need in the art for improved techniques to address the heat dissipation problem of AFM. Summary of the Invention

[0005] This summary is provided to introduce, in a simplified form, some concepts that will be further described in the following detailed description. This summary is not intended to identify key or essential features of the claimed subject matter, nor is it intended to help determine the scope of the claimed subject matter.

[0006] In view of the deficiencies of the prior art, the purpose of the present invention is to provide an axial flux motor with good heat dissipation.

[0007] According to a first aspect of the present invention, an axial flux motor is provided, which may include: a first rotor; a second rotor; and a stator located between the first rotor and the second rotor, wherein the first rotor includes a first set of magnets, the second rotor includes a second set of magnets, and the surfaces of the first set of magnets and the second set of magnets are roughened to make the surfaces rough.

[0008] According to one embodiment, the first group of magnets may include a plurality of first magnets spaced apart from each other, each of the plurality of first magnets comprising a segmented magnet made in a segmented manner. Furthermore, the second group of magnets may include a plurality of second magnets spaced apart from each other, each of the plurality of second magnets comprising a segmented magnet made in a segmented manner.

[0009] According to one embodiment, the axial flux motor may further include: a first end cover disposed outside a first rotor, wherein each segmented magnet in the first group of magnets includes a plurality of segments divided in a first direction facing the first end cover, wherein only the surface of the segment closest to the first end cover among the plurality of segments is rough. Furthermore, the axial flux motor may further include: a second end cover disposed outside a second rotor, wherein each segmented magnet in the second group of magnets includes a plurality of segments divided in a direction facing the second end cover, wherein only the surface of the segment closest to the second end cover among the plurality of segments is rough.

[0010] According to one embodiment, a rough surface may include one or more of the following: protrusions, depressions, or a scraped surface.

[0011] According to one embodiment, each segmented magnet in the first group of magnets may include multiple segments divided in a second direction parallel to the upper and lower bottom edges of the surface of the segmented magnet, wherein adjacent segments have different lengths in a first direction facing the first end cap. Each segmented magnet in the second group of magnets may include multiple segments divided in a direction parallel to the upper and lower bottom edges of the surface of the segmented magnet, wherein adjacent segments have different lengths in the direction facing the second end cap.

[0012] According to one embodiment, the plurality of segments may include a first group of segments and a second group of segments, the first group of segments including a plurality of segments each having a first length in a first direction, and the second group of segments including a plurality of segments each having a second length in the first direction, wherein each of the first group of segments and each of the second group of segments are arranged alternately.

[0013] According to one embodiment, the first length may be longer than the second length.

[0014] According to one embodiment, the first length may be longer than the second length by a certain length, such as 0.1 mm, 0.2 mm, or some other suitable length.

[0015] According to one embodiment, each segmented magnet in the first group of magnets may include multiple segments divided in a third direction perpendicular to the upper and lower bottom edges of the surface of the segmented magnet, wherein adjacent segments have different lengths in a first direction facing the first end cap. Each segmented magnet in the second group of magnets may include multiple segments divided in a direction perpendicular to the upper and lower bottom edges of the surface of the segmented magnet, wherein adjacent segments have different lengths in the direction facing the second end cap.

[0016] According to one embodiment, the axial flux motor may further include: a first end cover disposed outside a first rotor; and a second end cover disposed outside a second rotor, wherein each of the first end cover and the second end cover includes: an oil passage including a plurality of oil injection holes; and an oil pipe connected to the oil passage and an external oil pump, wherein cooling oil can enter the oil passage from the external oil pump via the oil pipe and be sprayed onto the rotor surface from the oil injection holes in the oil passage.

[0017] According to one embodiment, the oil passage can be an annular oil passage, and the plurality of injection holes can be uniformly or non-uniformly distributed in the annular oil passage.

[0018] According to one embodiment, the axial flux motor can be used as an electric drive for an electric vehicle.

[0019] According to a second aspect of the invention, a method for an axial flux motor is provided, the axial flux motor comprising: a first rotor; a second rotor; and a stator located between the first rotor and the second rotor, wherein the method may comprise providing a first set of magnets in the first rotor; providing a second set of magnets in the second rotor; and roughening the surfaces of the first set of magnets and the second set of magnets such that the surfaces are rough.

[0020] According to a third aspect of the invention, a vehicle is provided that includes the axial flux motor of the invention.

[0021] The technology provided by this invention can effectively solve the heat dissipation problem of axial flux motors, thereby significantly improving the heat dissipation efficiency of axial flux motors, reducing the operating temperature of axial flux motors, and extending the service life of axial flux motors.

[0022] These and other features and advantages will become apparent from the following detailed description and with reference to the accompanying drawings. It should be understood that the foregoing general description and the following detailed description are illustrative only and do not limit the scope of the claims. Attached Figure Description

[0023] To gain a more detailed understanding of the manner in which the features of the present invention are described above, reference can be made to various embodiments to provide a more specific description of the above-briefly summarized aspects, some of which are illustrated in the accompanying drawings. However, it should be noted that the drawings illustrate only certain typical aspects of the invention and should not be considered as limiting its scope, as this description may allow for other equivalent and effective aspects.

[0024] Figure 1 Block diagrams illustrating various components and / or systems implemented in an exemplary vehicle are provided.

[0025] Figure 2 A schematic diagram of a conventional axial flux motor is explained.

[0026] Figure 3 Another schematic diagram of a conventional axial flux motor is explained.

[0027] Figure 4 A schematic diagram of a rotor magnet according to an embodiment of the present invention has been described.

[0028] Figure 5 A schematic diagram of a segmented magnet according to an embodiment of the present invention has been described.

[0029] Figure 6 A schematic diagram of a segmented magnet according to an embodiment of the present invention has been described.

[0030] Figure 7 A schematic diagram of a segmented magnet according to an embodiment of the present invention has been described.

[0031] Figure 8 A schematic diagram of an axial flux motor according to an embodiment of the present invention has been described.

[0032] Figure 9 A flowchart illustrating a method for an axial flux motor according to an embodiment of the present invention is provided.

[0033] Figure 10 A block diagram of an exemplary computing device according to an embodiment of the present invention has been described. Detailed Implementation

[0034] In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the exemplary embodiments described. However, it will be apparent to those skilled in the art that the described embodiments can be practiced without some or all of these specific details. In other exemplary embodiments, well-known structures or processing steps have not been described in detail to avoid unnecessarily obscuring the concepts of this disclosure.

[0035] Figure 1 Block diagrams illustrating various components and / or systems implemented in the exemplary vehicle 100 are provided.

[0036] Vehicle 100 may include one or more cameras 135. A camera may include a camera sensor and mounting assembly. Different mounting assemblies may be used for different cameras on vehicle 100. For example, a front camera may be mounted in the front bumper, in the stalk of a rearview mirror assembly, or in other front areas of vehicle 100. A rear camera may be mounted in the rear bumper / fender, on the rear windshield, in the trunk, or in other rear areas of the vehicle. Side mirrors may be mounted on the sides of vehicle 100, such as integrated into mirror assemblies or door assemblies. Cameras can provide object detection and distance estimation (especially for objects of known size and / or shape) and may also provide information about rotational motion relative to the vehicle's axes (such as during cornering). When used in conjunction with other sensors, cameras can be calibrated using other systems (such as by using LiDAR, distance sensors, etc.) to verify travel distance and angular orientation. Cameras can similarly be used to verify and calibrate other systems to verify that distance measurements are correct and also to verify that object detection is performed accurately so that objects are mapped to the correct position relative to the vehicle by LiDAR and other systems accordingly. Similarly, when combined with, for example, an accelerometer, the time of impact with a road hazard can be estimated (e.g., the time elapsed before hitting a pothole).

[0037] In one embodiment, the accelerometer, gyroscope, and magnetometer 140 can be used to provide and / or verify motion and orientation information. The accelerometer and gyroscope can be used to monitor wheel and drivetrain performance. In one embodiment, the accelerometer can also be used to verify the actual collision time of road hazards (such as potholes) relative to the predicted time, based on existing braking and acceleration models and steering models. In one embodiment, the gyroscope and magnetometer can be used to measure the vehicle's rotational state and orientation relative to magnetic north, respectively, and to measure and calibrate estimates and / or models of turning radius at current speeds and / or maneuverability metrics at current speeds (especially when used in conjunction with measurements from other external and internal sensors (such as other sensors 145, such as speed sensors, and / or odometer measurements)).

[0038] The LiDAR 150 subsystem uses pulsed lasers to measure distances to objects. While cameras can be used for object detection, the LiDAR 150 provides a more definitive means of detecting the distance (and orientation) of objects, especially those of unknown size and shape. LiDAR 150 measurements can also be used to estimate travel speed, vector direction, relative positioning, and braking distance by providing accurate distance measurements and incremental distance measurements.

[0039] Memory 160 may be used in conjunction with processor 110 and / or digital signal processor (DSP) 120, and may include flash memory, RAM, ROM, disk drives, or flash memory cards or other memory devices, or various combinations thereof. In one embodiment, memory 160 may contain instructions for implementing the various methods described throughout this specification. In one embodiment, memory may contain instructions for operating and calibrating sensors, receiving maps, weather, vehicle (both vehicle 100 and surrounding vehicles) and other data, and determining driving parameters (such as relative positioning, absolute positioning, braking distance, acceleration and turning radius at current speed and / or maneuverability at current speed, inter-vehicle distance, turn initiation / timing and execution, and initiation / timing of driving operations) using various internal and external sensor measurements and the received data and measurements.

[0040] In one embodiment, the power and drive system (generator, battery pack, transmission, engine) and related systems 175 and 155 (brakes, actuators, throttle control, steering, and electrical) may be controlled by processors and / or hardware or software, or by the vehicle operator, or by some combination thereof. System 155 (brakes, actuators, throttle control, steering, and electrical, etc.) and the power and drive or other systems 175 may be utilized in conjunction with performance and operating parameters to enable the autonomous (and manual, with regard to warnings and emergency override / brake / stop) safe and accurate driving and operation of vehicle 100, such as safely, efficiently, and effectively merging into traffic, parking, accelerating, and otherwise operating vehicle 100. In one embodiment, inputs from various sensor systems (such as camera 135, accelerometer, gyroscope and magnetometer 140, LIDAR 150, GNSS receiver 170, radar 153, inputs from (a few) wireless transceivers 130 and / or other sensors 145 or various combinations thereof, message transmission and / or measurements) can be used by processor 110 and / or DSP 120 or other processing systems to control power and drive system 175 and system (brake, actuator, throttle control, steering and electrical) 155.

[0041] Global Navigation Satellite System (GNSS) receivers can be used to determine positioning relative to the ground (absolute positioning) and, when used in conjunction with other information such as measurement and / or mapping data from other objects, can be used to determine positioning relative to other objects (such as relative to other vehicles and / or relative to the road surface).

[0042] In one embodiment, the GNSS receiver 170 may support one or more GNSS constellations and other satellite-based navigation systems. For example, in one embodiment, the GNSS receiver 170 may support global navigation satellite systems such as the Global Positioning System (GPS), the Russian Global Navigation Satellite System (GLONASS), Galileo, and / or BeiDou, or any combination thereof. In one embodiment, the GNSS receiver 170 may support regional navigation satellite systems (such as NAVIC or QZSS, or combinations thereof) and various augmentation systems (e.g., satellite-based augmentation systems (SBAS) or terrestrial-based augmentation systems (GBAS)), such as satellite-integrated Doppler orbit charts and radio positioning (DORIS) or wide-area augmentation systems (WAAS) or European Geostationary Navigation Coverage Service (EGNOS) or multi-function satellite augmentation systems (MSAS) or local augmentation systems (LAAS). In one embodiment, the GNSS receiver 130 and antenna 132 may support multiple frequency bands and sub-bands, such as GPS L1, L2 and L5 bands, Galileo E1, E5 and E6 bands, Compass (BeiDou) B1, B3 and B2 bands, GLONASS G1, G2 and G3 bands, and QZSS L1C, L2C and L5-Q bands.

[0043] GNSS receiver 170 can be used to determine position and relative position that can be used for positioning and navigation, and to calibrate other sensors when appropriate, such as for determining the distance between two points in time under clear sky conditions and using distance data to calibrate other sensors (such as odometers and / or LiDAR). In one embodiment, GNSS-based relative position based on, for example, Doppler and / or pseudorange measurements shared between vehicles can be used to determine a highly accurate distance between two vehicles, and when combined with vehicle information (such as shape and model information and GNSS antenna position), can be used to calibrate, validate, and / or influence the confidence level associated with information from LiDAR, cameras, radar, sonar, and other distance estimation techniques. GNSS Doppler measurements can also be used to determine the linear and rotational motion of a vehicle or a vehicle relative to another vehicle, and can be used in conjunction with gyroscopes and / or magnetometers and other sensor systems to maintain the calibration of those systems based on the measured position data. Relative GNSS positioning data can also be combined with high-confidence absolute position from roadside equipment (also known as roadside units or RSUs) to determine the high-confidence absolute position of the vehicle. Furthermore, during severe weather conditions that may obscure LiDAR and / or camera-based data sources, relative GNSS positioning data can be used to avoid other vehicles and remain in lanes or other assigned road areas. For example, using an RSU equipped with a GNSS receiver and V2X capabilities, GNSS measurement data can be provided to the vehicle, which, when provided in conjunction with the RSU's absolute position, can be used to navigate the vehicle relative to a map, thereby keeping the vehicle in its lane and / or on the road despite the lack of visibility.

[0044] Radio detection and ranging (radar 153) uses transmitted radio waves reflected from an object. The reflected radio waves are analyzed based on the time required for the reflection to arrive and other signal characteristics of the reflected waves to determine the location of nearby objects. Radar 153 can be used to detect the location of nearby vehicles, roadside objects (signs, other vehicles, pedestrians, etc.), and can generally detect objects even in ambiguous weather conditions such as snow, rain, or hail. Thus, radar 153 can be used to supplement the LIDAR 150 system and camera 135 by providing ranging and distance measurements and information when vision-based systems typically fail. Furthermore, radar 153 can be used to calibrate and / or perform sanity checks on other systems (such as LIDAR 150 and camera 135). Ranging measurements from radar 153 can be used to determine / measure braking distance, acceleration, handling at current speed, and / or turning radius and / or handling metrics at current speed. In some systems, ground-penetrating radar can also be used to track road surfaces via radar reflection markings on the road surface or terrain features such as ditches.

[0045] Figure 2 A schematic diagram of a conventional axial flux motor 200 has been explained. It should be noted that... Figure 2 For illustrative purposes only, actual axial flux motors may include those with a different magnetic flux ratio. Figure 2 The number of components described in the document may be more or less.

[0046] like Figure 2 As shown, the axial flux motor 200 can be, for example, a dual-rotor, single-stator axial flux motor, and may include a first rotor 220, a second rotor 250, and a stator 240 located between the first rotor 220 and the second rotor 250. Furthermore, the axial flux motor 200 may also include a housing 230, a first end cover 210 disposed outside the first rotor 220, and a second end cover 260 disposed outside the second rotor 250. Thus, the first rotor 220, the second rotor 250, and the stator 240 can be arranged within the cavity formed by the first end cover 210, the second end cover 260, and the housing 230.

[0047] Figure 3 A schematic diagram of a conventional axial flux motor 300 is provided. Note that... Figure 3 For illustrative purposes only, actual axial flux motors may include those with a different magnetic flux ratio. Figure 3 The number of components described in the document may be more or less.

[0048] like Figure 3 As shown, the axial flux motor 300 can be, for example, a dual-rotor, single-stator axial flux motor, and may include a first rotor 310, a second rotor 320, and a stator 330 located between the first rotor 310 and the second rotor 320. The stator 330 carries a plurality of coils 332. The first rotor 310 and the second rotor 320 carry magnets 312 and 322 facing each other, which may include permanent magnets, which can be made of any suitable material (including but not limited to alloy permanent magnet materials, ferrite permanent magnet materials, rare earth permanent magnet materials, etc.). Two adjacent magnets in the same rotor may be separated by a gap 314. When the coils 332 are energized, the first rotor 310 and the second rotor 320 will rotate about the rotation axis 340 due to electromagnetic induction.

[0049] As mentioned above, conventional axial flux motors, when operating at high power, suffer from a lack of heat dissipation mechanisms (especially for the magnets, which are the primary heat source), leading to increased motor temperature and impacting motor performance and lifespan. To address this technical problem, this invention proposes an improved magnet structure: roughening the originally smooth magnet surface to allow the cooling oil (or coolant) to remain on the magnet surface for as long as possible when sprayed onto it, thereby enhancing the cooling effect.

[0050] Figure 4 A schematic diagram of a rotor magnet 400 according to an embodiment of the present invention is illustrated. The rotor magnet 400 may be included in a first rotor and / or a second rotor. In one embodiment, the rotor magnet 400 may include a plurality of magnets. For example, in Figure 4 The rotor magnet 400 shown may include 24 individually spaced magnets. It should be noted that... Figure 4 The number of magnets shown is merely exemplary and not limiting; the rotor magnet 400 may include more or fewer magnets as needed.

[0051] exist Figure 4 In the example shown, the surface 450 of the rotor magnet 400 (e.g., the surface facing the corresponding end cap) may be roughened. The purpose of this roughening is to improve surface adhesion and bonding, allowing the cooling oil to remain on the magnet surface for as long as possible when sprayed from the end cap, thereby further improving the cooling effect. The following... Figures 5 to 7 Several embodiments for roughening the surface 450 of the rotor magnet 400 are described in detail below.

[0052] In one embodiment, the rotor magnet may include a plurality of magnets, each of which may be a trapezoidal magnet having a trapezoidal cross-section, and includes segmented magnets made in a segmented manner. It should be noted that the invention is not limited to trapezoidal magnets, but may include magnets of any other shape (e.g., cuboid magnets, etc.). For ease of explanation, the direction parallel to the axis of rotation and pointing from the rotor surface toward the end cap is defined below as the first direction (e.g., Figure 5 The first direction 520 shown is defined as the direction parallel to the upper and lower base edges of the surface of the trapezoidal magnet, and the second direction is defined as the direction (e.g., Figure 6 The second direction 620 shown in the figure), and the direction perpendicular to the top and bottom edges of the surface of the trapezoidal magnet are defined as the third direction (e.g., Figure 7 The third party shown is 720).

[0053] Figure 5 A schematic diagram of a segmented magnet 500 according to an embodiment of the present invention is explained. Figure 5 In the example shown, the segmented magnet 500 may include multiple segments divided in the first direction 520 (e.g., Figure 5 The diagram shows five segments (though other numbers of segments are possible). In one embodiment, only the surface 550 of the segment closest to (i.e., facing) the end cap (e.g., the first end cap 810) is roughened. This can be achieved, for example, by processes such as sandblasting, chemical etching, laser ablation, or mechanical grinding. In one embodiment, after roughening, the rotor magnet surface 550 may include one or more of the following: protrusions, recesses, or a scraped surface. Thus, when viewed from the end cap toward the rotor magnet surface 550, the rotor magnet surface 550 will be rough, allowing the cooling oil sprayed from the end cap to remain on the rotor magnet surface 550 for as long as possible, thereby enhancing the cooling effect.

[0054] Figure 6 A schematic diagram of a segmented magnet 600 according to an embodiment of the present invention has been described. Figure 6 As shown, the segmented magnet 600 may include multiple segments divided in the second direction 620 (e.g., Figure 6 The diagram shows 10 segments (other numbers of segments are possible), where adjacent segments can have different lengths in the first direction. For example, the segmented magnet 600 may include a first group of segments and a second group of segments. The first group of segments may include multiple segments each having a first length in the first direction, and the second group of segments may include multiple segments each having a second length in the first direction. The first length may be longer than the second length, and each segment in the first group and each segment in the second group may be arranged alternately. In one example, the first length may be larger than the second length by a specific value, such as 0.1 mm, 0.2 mm, etc. Thus, when viewed from the end cover towards the rotor magnet surface 650, the rotor magnet surface 650 will be rough, thereby prolonging the time the cooling oil remains on the rotor magnet surface 650 when it is sprayed from the end cover, enhancing the cooling effect. Furthermore, preferably, the side of the multiple segments facing the end cover may also be roughened, as described above for... Figure 5 As illustrated in the embodiments shown, the cooling effect can be further enhanced.

[0055] Figure 7 A schematic diagram of a segmented magnet 700 according to an embodiment of the present invention has been described. Figure 7 As shown, the segmented magnet 700 may include multiple segments divided on a third direction 720 (e.g., Figure 7The 12 segments shown (and other possible numbers of segments) can have different lengths for adjacent segments in the first direction. For example, the segmented magnet 700 may include a first group of segments and a second group of segments. The first group of segments may include multiple segments each having a first length in the first direction, and the second group of segments may include multiple segments each having a second length in the first direction. The first length may be longer than the second length, and each segment in the first group and each segment in the second group may be arranged alternately. In one example, the first length may be larger than the second length by a specific value, such as 0.1 mm, 0.2 mm, etc. Thus, when viewed from the end cover toward the rotor magnet surface 750, the rotor magnet surface 750 will be rough, thereby prolonging the time the cooling oil remains on the rotor magnet surface 750 when it is sprayed from the end cover, enhancing the cooling effect. Furthermore, preferably, the side of the multiple segments facing the end cover may also be roughened, as described above for... Figure 5 As illustrated in the embodiments shown, the cooling effect can be further enhanced.

[0056] Figure 8 A schematic diagram of an axial flux motor 800 according to an embodiment of the present invention has been explained. It should be noted that... Figure 8 For illustrative purposes only, actual axial flux motors may include those with a different magnetic flux ratio. Figure 8 The number of components described in the document may be more or less.

[0057] like Figure 8 As shown, the axial flux motor 800 may include a first rotor 820, a second rotor 840, and a stator 830 located between the first rotor 820 and the second rotor 840. The first rotor 820, the stator 830, and the second rotor 840 can be connected by a rotating shaft ( Figure 8 (Not shown in the image) is used for connection. The axial flux motor 800 may further include a first end cover 810 disposed outside the first rotor 820, and a second end cover disposed outside the second rotor 840. Figure 8 (Not shown in the diagram). The first rotor 820 and / or the second rotor 840 may each carry the rotor magnet of the present invention (e.g., Figures 4-7 (The rotor magnet shown)

[0058] The first end cap 810 may include an oil passage 816 for receiving and transporting cooling oil. Figure 8In the illustrated embodiment, the oil passage 816 can be an annular oil passage. However, the oil passage 816 can also be an oil passage of other suitable shapes (e.g., elliptical, square, rectangular, etc.). Multiple oil injection holes 812 can be provided in the oil passage 816, and these multiple oil injection holes 812 can be uniformly or non-uniformly distributed in the oil passage 816. The first end cap 810 may also include an oil pipe 818 connected to the oil passage 816 and an external oil pump (not shown). Thus, cooling oil can enter the oil passage 816 from the external oil pump via the oil pipe 818 and be sprayed from the multiple oil injection holes 812 in the oil passage 816 along the injection direction 814 onto the rotor surface (e.g., rotor magnet) to cool the rotor. In one embodiment, a temperature sensor can be used to detect the temperature of the rotor surface, and when the rotor surface temperature exceeds a threshold, an external oil pump can be controlled to deliver cooling oil to the oil passage 816 to spray cooling oil onto the rotor surface (e.g., the rotor magnet) via the plurality of oil injection holes 812 (e.g., for a predetermined time duration) to cool the rotor surface. In another embodiment, the plurality of oil injection holes 812 can be controlled to spray cooling oil onto the rotor surface (e.g., the rotor magnet) at predetermined time intervals (e.g., 1 second, 2 seconds, etc.). In yet another embodiment, cooling oil can be sprayed onto the rotor surface according to the vehicle speed. For example, if the vehicle speed is high, it means that the motor 800 is operating at high speed, so cooling oil needs to be sprayed onto the rotor surface to cool it.

[0059] The second end cap can be constructed in a similar manner to the first end cap 810, and will not be described in detail here.

[0060] Figure 9 A flowchart illustrating a method 900 for an axial flux motor according to an embodiment of the present invention is provided. The axial flux motor may include: a first rotor; a second rotor; and a stator located between the first rotor and the second rotor, wherein the first rotor, the stator, and the second rotor may be connected by a shaft.

[0061] In block 910, method 900 may include providing a first set of magnets (e.g., rotor magnet 400) in a first rotor.

[0062] In block 920, method 900 may include providing a second set of magnets (e.g., rotor magnet 400) in a second rotor.

[0063] In block 930, method 900 may include roughening (450) the surfaces of the first set of magnets and the second set of magnets to make the surfaces rough. In one embodiment, the roughened surface can be achieved by referring to the above-described methods respectively. Figures 5-7 The segmented magnet described is implemented through design.

[0064] In one embodiment, the first group of magnets may include a plurality of first magnets spaced apart from each other, each of the plurality of first magnets including a segmented magnet made in a segmented manner (e.g., segmented magnets 500, 600, 700). The second group of magnets may include a plurality of second magnets spaced apart from each other, each of the plurality of second magnets including a segmented magnet made in a segmented manner (e.g., segmented magnets 500, 600, 700).

[0065] Reference above Figures 4-9 The present invention describes in detail the rotor magnet design of the axial flux motor and the method for using the axial flux motor. By cleverly designing the rotor magnet and / or the cooling oil injection mechanism for the axial flux motor, the heat dissipation problem of the axial flux motor is effectively solved, thereby significantly improving the heat dissipation efficiency of the axial flux motor, reducing the operating temperature of the axial flux motor, and extending the service life of the axial flux motor.

[0066] refer to Figure 10 A computing device 1000 will now be described as an example of a hardware device (e.g., user equipment, cloud server, vehicle control unit, etc.) applicable to various aspects of the present invention. The computing device 1000 can be any machine configured to perform processing and / or computation, and can be, but is not limited to, a workstation, server, desktop computer, laptop computer, tablet computer, personal digital processor, smartphone, vehicle computer, or any combination thereof. The various methods / apparatus / servers / user equipment described above can be implemented wholly or at least partially by the computing device 1000 or similar devices or systems.

[0067] The computing device 1000 may include components that can be connected or communicated via one or more interfaces and a bus 1002. For example, the computing device 1000 may include a bus 1002, one or more processors 1004, one or more input devices 1006, and one or more output devices 1008. The one or more processors 1004 may be any type of processor and may include, but are not limited to, one or more general-purpose processors and / or one or more dedicated processors (e.g., specialized processing chips). The input device 1006 may be any type of device capable of inputting information to the computing device and may include, but is not limited to, a mouse, keyboard, touchscreen, microphone, and / or remote controller. The output device 1008 may be any type of device capable of presenting information and may include, but is not limited to, a monitor, speaker, video / audio output terminal, vibrator, and / or printer. The computing device 1000 may also include or be connected to a non-transient storage device 1010. The non-transient storage device can be any non-transient storage device capable of data storage, and may include, but is not limited to, disk drives, optical storage devices, solid-state storage, floppy disks, hard disks, magnetic tapes or any other magnetic media, optical discs or any other optical media, ROM (read-only memory), RAM (random access memory), cache memory, and / or any memory chip or cassette tape, and / or any other medium from which a computer can read data, instructions, and / or code. The non-transient storage device 1010 may be detachable from an interface. The non-transient storage device 1010 may have data / instructions / code for implementing the methods and steps described above. The computing device 1000 may also include a communication device 1012. The communication device 1012 can be any type of device or system capable of communicating with internal devices and / or with a network, and may include, but is not limited to, modems, network cards, infrared communication devices, wireless communication devices and / or chipsets, such as Bluetooth devices, IEEE 1302.11 devices, WiFi devices, WiMax devices, cellular communication devices and / or similar devices.

[0068] When the computing device 1000 is used as an in-vehicle device, it can also be connected to external devices (e.g., a GPS receiver, sensors for sensing different environmental data such as accelerometers, wheel speed sensors, gyroscopes, etc.). In this way, the computing device 1000 can, for example, receive positioning data and sensor data indicating the vehicle's driving status. When the computing device 1000 is used as an in-vehicle device, it can also be connected to other devices used to control the vehicle's driving and operation (e.g., engine system, windshield wipers, anti-lock braking system, headlight control system, etc.).

[0069] Furthermore, the non-transient storage device 1010 may contain map information and software components, enabling the processor 1004 to perform route guidance processing. Additionally, the output device 1006 may include a display for showing a map, displaying vehicle location markers, and displaying images indicating the vehicle's driving status. The output device 1006 may also include a speaker or headphone jack for audio guidance.

[0070] Bus 1002 may include, but is not limited to, Industry Standard Architecture (ISA) bus, Microchannel Architecture (MCA) bus, Enhanced ISA (EISA) bus, Video Electronics Standards Association (VESA) local bus, and PCI bus. In particular, for automotive devices, bus 1002 may also include Controller Area Network (CAN) bus or other architectures designed for automotive applications.

[0071] The computing device 1000 may also include a working memory 1014, which may be any type of working memory capable of storing instructions and / or data that are conducive to the operation of the processor 1004, and may include, but is not limited to, random access memory and / or read-only memory devices.

[0072] Software components may reside in working memory 1014, including but not limited to operating system 1016, one or more application programs 1018, drivers, and / or other data and code. Instructions for implementing the above methods and steps may be contained in the one or more application programs 1018, and the modules / units / components of the aforementioned various devices / servers / user equipment may be implemented by processor 1004 reading and executing the instructions of the one or more application programs 1018.

[0073] It should also be recognized that variations can be made to suit specific needs. For example, custom hardware and / or specific components may be used, and implementation may take place in hardware, software, firmware, middleware, microcode, hardware description language, or any combination thereof. Furthermore, connectivity with other computing devices, such as network input / output devices, may be employed. For example, some or all of the disclosed methods and apparatus may be implemented using the logic and algorithms according to the invention via programmable hardware (e.g., programmable logic circuits including field-programmable gate arrays (FPGAs) and / or programmable logic arrays (PLAs)) that uses assembly language or hardware programming languages ​​(e.g., Verilog, VHDL, C++).

[0074] Although various aspects of the invention have been described so far with reference to the accompanying drawings, the methods, systems, and apparatus described above are merely examples, and the scope of the invention is not limited to these aspects but is defined only by the appended claims and their equivalents. Various components may be omitted or replaced by equivalent components. Furthermore, the steps may be performed in a different order than that described in the invention. Moreover, various components can be combined in various ways. Importantly, as technology advances, many of the components described may be replaced by equivalent components that appear later.

Claims

1. An axial flux motor, the axial flux motor comprising: First rotor; Second rotor; The stator located between the first rotor and the second rotor, The first rotor includes a first set of magnets, and the second rotor includes a second set of magnets. The surfaces of the first group of magnets and the second group of magnets are roughened to make the surfaces rough.

2. The axial flux motor of claim 1, wherein the first group of magnets comprises a plurality of first magnets spaced apart from each other, each of the plurality of first magnets comprising a segmented magnet made in a segmented manner.

3. The axial flux motor of claim 2, further comprising: The first end cover is arranged on the outside of the first rotor. The segmented magnet comprises a plurality of segments divided in a first direction facing the first end cap, wherein only the surface of the segment closest to the first end cap among the plurality of segments is rough.

4. The axial flux motor of claim 3, wherein the rough surface includes one or more of the following: a protrusion, a recess, or a scraped surface.

5. The axial flux machine of claim 2, further comprising: The first end cover is arranged on the outside of the first rotor. The segmented magnet comprises multiple segments divided in a second direction parallel to the upper and lower bottom edges of the surface of the segmented magnet, wherein two adjacent segments have different lengths in a first direction facing the first end cap.

6. The axial flux motor of claim 5, wherein the plurality of segments include a first group segment and a second group segment, the first group segment including a plurality of segments each having a first length in the first direction, the second group segment including a plurality of segments each having a second length in the first direction, wherein each of the first group segment and each of the second group segment are arranged alternately.

7. The axial flux motor of claim 6, wherein the first length is greater than the second length.

8. The axial flux motor as claimed in claim 7, wherein the first length is 0.1 mm longer than the second length.

9. The axial flux machine of claim 2, further comprising: The first end cover is arranged on the outside of the first rotor. The segmented magnet comprises multiple segments divided in a third direction perpendicular to the upper and lower bottom edges of the surface of the segmented magnet, wherein two adjacent segments have different lengths in a first direction facing the first end cap.

10. The axial flux motor of claim 9, wherein the plurality of segments include a first group segment and a second group segment, the first group segment including a plurality of segments each having a first length in the first direction, the second group segment including a plurality of segments each having a second length in the first direction, wherein each of the first group segment and each of the second group segment are arranged alternately.

11. The axial flux motor of claim 1, wherein the axial flux motor further comprises: A first end cap disposed on the outside of the first rotor; as well as The second end cap is located on the outside of the second rotor. Each of the first end cap and the second end cap includes: Oil passage, the oil passage including multiple oil injection holes; as well as The oil pipes connected to the oil passage and the external oil pump, Cooling oil can enter the oil passage from the external oil pump via the oil pipe, and be sprayed onto the rotor surface from the oil injection hole in the oil passage.

12. The axial flux motor as claimed in claim 11, wherein the oil passage is an annular oil passage, and the plurality of oil injection holes are evenly distributed in the annular oil passage.

13. The axial flux motor of claim 1, wherein the axial flux motor is used as an electric drive for an electric vehicle.

14. A method for an axial flux motor, wherein the axial flux motor comprises: First rotor; Second rotor; The stator is located between the first rotor and the second rotor; The method includes: A first set of magnets is provided in the first rotor; A second set of magnets is provided in the second rotor; and The surfaces of the first group of magnets and the second group of magnets are roughened to make the surfaces rough.

15. A vehicle comprising an axial flux motor as claimed in any one of claims 1-13.

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