Axial flux electric machine and method for cooling an axial flux electric machine

Abstract

This invention provides an axial flux motor, comprising: a first rotor; a second rotor; a stator located between the first rotor and the second rotor; and a first end cover disposed outside the first rotor. The first rotor includes a first rotor magnet and a first support plate in direct contact with the first rotor magnet. The surface of the first support plate is rough. The first end cover includes: a first oil passage including a first plurality of oil injection holes; and a first oil pipe connected to the first oil passage and an external oil pump. Cooling oil enters the first oil passage from the external oil pump via the first oil pipe and is sprayed from the first plurality of oil injection holes in the first oil passage onto the surface of the first support plate. Furthermore, this invention provides a method for cooling the axial flux motor. This invention effectively solves the heat dissipation problem of the axial flux motor, 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 cooling 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 suffer from heat dissipation difficulties during high-power operation, leading to increased motor temperature and impacting motor performance and lifespan. Traditional cooling methods are ineffective. Therefore, a new cooling system and method are needed to address this issue. Summary of the Invention

[0004] 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.

[0005] In view of the deficiencies of the prior art, the object of the present invention is to provide an axial flux motor with good heat dissipation and a method for efficiently cooling the axial flux motor.

[0006] According to a first aspect of the present invention, an axial flux motor is provided, the axial flux motor comprising: a first rotor; a second rotor; a stator located between the first rotor and the second rotor; and a first end cover disposed outside the first rotor, wherein the first rotor includes a first rotor magnet and a first support plate in direct contact with the first rotor magnet, wherein the surface of the first support plate is rough, wherein the first end cover includes: a first oil passage including a first plurality of oil injection holes; and a first oil pipe connected to the first oil passage and an external oil pump, wherein cooling oil can enter the first oil passage from the external oil pump via the first oil pipe and be sprayed from the first plurality of oil injection holes in the first oil passage onto the surface of the first support plate.

[0007] According to one embodiment, the axial flux motor may further include: a second end cover disposed outside the second rotor, wherein the second rotor includes a second rotor magnet and a second support plate in direct contact with the second rotor magnet, wherein the surface of the second support plate is rough, wherein the second end cover includes: a second oil passage including a second plurality of oil injection holes; and a second oil pipe connected to the second oil passage and an external oil pump, wherein cooling oil can enter the second oil passage from the external oil pump via the second oil pipe and be sprayed from the second plurality of oil injection holes in the second oil passage onto the surface of the second support plate.

[0008] According to one embodiment, the surface of the first support plate and / or the surface of the second support plate may include one or more of the following: protrusions, recesses, or scraped surfaces.

[0009] According to one embodiment, the first oil passage and / or the second oil passage can be an annular oil passage or any other suitable shape. The first plurality of injection holes and / or the second plurality of injection holes can be uniformly or non-uniformly distributed in the annular oil passage.

[0010] According to one embodiment, the first plurality of oil injection holes can be further configured to spray cooling oil onto the surface of the first support plate when the temperature of the first rotor exceeds a threshold. The second plurality of oil injection holes can be further configured to spray cooling oil onto the surface of the second support plate when the temperature of the second rotor exceeds a threshold.

[0011] According to one embodiment, the first plurality of injection holes can be further configured to spray cooling oil onto the surface of the first support plate according to the vehicle speed. The second plurality of injection holes can be further configured to spray cooling oil onto the surface of the second support plate according to the vehicle speed.

[0012] According to one embodiment, the axial flux motor can be used as an electric drive for an electric vehicle.

[0013] According to a second aspect of the present invention, a method for cooling an axial flux motor is provided, the axial flux motor comprising: a first rotor; a second rotor; a stator located between the first rotor and the second rotor; and a first end cover disposed outside the first rotor, wherein the first rotor includes a first rotor magnet and a first support plate in direct contact with the first rotor magnet, wherein the method comprises: roughening the surface of the first support plate; arranging a first oil passage in the first end cover; providing a first plurality of oil injection holes in the first oil passage; connecting the first oil passage to an external oil pump via a first oil pipe; and supplying cooling oil from the external oil pump into the first oil passage via the first oil pipe, and causing the cooling oil to be sprayed from the first plurality of oil injection holes in the first oil passage onto the surface of the first support plate.

[0014] According to one embodiment, the axial flux motor may further include: a second end cover disposed outside the second rotor, wherein the second rotor includes a second rotor magnet and a second support plate in direct contact with the second rotor magnet, the method further including: roughening the surface of the second support plate; arranging a second oil passage in the second end cover; providing a second plurality of oil injection holes in the second oil passage; connecting the second oil passage to an external oil pump via a second oil pipe; and sending cooling oil from the external oil pump into the second oil passage via the second oil pipe, and spraying the cooling oil from the second plurality of oil injection holes in the second oil passage onto the surface of the second support plate.

[0015] According to one embodiment, the method may further include: spraying cooling oil onto the surface of the first support plate through the first plurality of oil injection holes when the temperature of the first rotor exceeds a threshold; and / or spraying cooling oil onto the surface of the second support plate through the second plurality of oil injection holes when the temperature of the second rotor exceeds a threshold.

[0016] According to one embodiment, the method may further include: spraying cooling oil onto the surface of the first support plate through the first plurality of oil injection holes according to the vehicle speed; and / or spraying cooling oil onto the surface of the second support plate through the second plurality of oil injection holes according to the vehicle speed.

[0017] According to a third aspect of the invention, a vehicle is provided that includes the axial flux motor of the invention.

[0018] 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.

[0019] 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

[0020] 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.

[0021] Figure 1 Block diagrams illustrating various components and / or systems implemented in an exemplary vehicle are provided.

[0022] Figure 2 A schematic diagram of a conventional axial flux motor is explained.

[0023] Figure 3 Another schematic diagram of a conventional axial flux motor is explained.

[0024] Figure 4 A schematic diagram of an axial flux motor according to an embodiment of the present invention has been described.

[0025] Figure 5 A flowchart illustrating a method for cooling an axial flux motor according to an embodiment of the present invention is provided.

[0026] Figure 6 A block diagram of an exemplary computing device according to an embodiment of the present invention has been described. Detailed Implementation

[0027] 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.

[0028] Figure 1 Block diagrams illustrating various components and / or systems implemented in the exemplary vehicle 100 are provided.

[0029] 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).

[0030] 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)).

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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).

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] As mentioned above, conventional axial flux motors experience temperature increases during high-power operation due to heat dissipation difficulties (especially for the rotor magnets, the main heat source), which affects motor performance and lifespan. Therefore, this application proposes a novel heat dissipation system and method to address this problem.

[0043] Figure 4 A schematic diagram of an axial flux motor 400 according to an embodiment of the present invention has been explained. It should be noted that... Figure 4For illustrative purposes only, actual axial flux motors may include those with a different magnetic flux ratio. Figure 4 The number of components described in the document may be more or less.

[0044] like Figure 4 As shown, the axial flux motor 400 may include a first rotor 420, a second rotor 440, and a stator 430 located between the first rotor 420 and the second rotor 440. The first rotor 420, the first stator 430, and the second rotor 440 can be connected by a rotating shaft ( Figure 4 (Not shown in the image) is used for connection. The axial flux motor 400 may further include a first end cover 410 disposed outside the first rotor 420, and a second end cover disposed outside the second rotor 440. Figure 4 (Not shown in the image).

[0045] The first rotor 420 may include a rotor magnet 422 and a support plate 425 in direct contact with the rotor magnet 422. The second rotor 440 may include a rotor magnet 442 and a support plate 445 in direct contact with the rotor magnet 442. The support plates 425 and 445 are generally used to support and fix the rotor magnets 422 and 442.

[0046] When an axial flux motor is operating, the rotor magnet is the primary heat source. To achieve more efficient cooling, in one embodiment, the support plates 425 and 445 can be made of a thermally conductive material, so that the cooling oil sprayed from the injection holes will first be sprayed onto the support plates 425 and 445, thereby cooling the rotor and its magnets. In one embodiment, to allow the cooling oil to remain on the surfaces of the support plates 425 and 445 for as long as possible to enhance the cooling effect, the surfaces of the support plates 425 and 445 can be roughened. Figure 4 (Represented by dots on the corresponding support plates). Here, the purpose of roughening is to improve surface adhesion and bonding strength. This treatment can increase the surface area available for bonding by changing the surface morphology (e.g., creating small depressions, pits, or protrusions). Methods for achieving surface roughening can include, for example, sandblasting, chemical etching, laser ablation, or mechanical grinding. In one embodiment, after roughening, the surfaces of support plates 425 and 445 may include one or more of the following: protrusions, depressions, or scraped surfaces.

[0047] The first end cap 410 may include an oil passage 416 for receiving and transporting cooling oil. Figure 4In the illustrated embodiment, the oil passage 416 may be an annular oil passage. However, the oil passage 416 may also be an oil passage of other suitable shapes (e.g., elliptical, square, rectangular, etc.). Multiple oil injection holes 412 may be provided in the oil passage 416, and these holes may be evenly or unevenly distributed within the oil passage 416. The first end cap 410 may also include an oil pipe 418 connected to the oil passage 416 and an external oil pump (not shown). Thus, cooling oil can enter the oil passage 416 from the external oil pump via the oil pipe 418 and be sprayed from the multiple oil injection holes 412 in the oil passage 416 along the injection direction 414 onto the surface of the support plate 425 of the rotor 420 to cool the rotor 420. 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 416 to spray cooling oil onto the surface of the support plate 425 via the plurality of oil injection holes 412 (e.g., for a predetermined time duration) to cool the rotor. In another embodiment, the plurality of oil injection holes 312 can be controlled to spray cooling oil onto the surface of the support plate 425 at predetermined time intervals (e.g., 1 second, 2 seconds, etc.). In yet another embodiment, cooling oil can be sprayed onto the surface of the support plate 425 according to the vehicle speed. For example, if the vehicle speed is high, it means that the motor 400 is operating at high speed, so cooling oil needs to be sprayed onto the surface of the support plate 425 to cool the rotor.

[0048] The second end cap can be constructed in a similar manner to the first end cap 410, and will not be described in detail here.

[0049] Figure 5 A flowchart illustrating a method 500 for cooling 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; a stator located between the first rotor and the second rotor; and a first end cover disposed outside the first rotor, wherein the first rotor includes a first rotor magnet and a first support plate in direct contact with the first rotor magnet.

[0050] At block 510, method 500 may include roughening the surface of the first support plate. Methods for roughening the surface may include, for example, sandblasting, chemical etching, laser ablation, or mechanical grinding. In one embodiment, after roughening, the surface of the first support plate may include one or more of the following: protrusions, recesses, or a scraped surface.

[0051] In block 520, method 500 may include arranging a first oil passage in the first end cap (e.g., as shown in reference). Figure 4 The oil passage shown is 416. This oil passage can be an annular oil passage or any other suitable shape.

[0052] In box 530, method 500 may include providing a first plurality of injection holes in a first oil passage (e.g., as shown in reference). Figure 4 (As shown in the oil injection hole 412). These multiple oil injection holes can be evenly or unevenly distributed in the first oil passage.

[0053] In box 540, method 500 may include via a first tubing (e.g., as referenced) Figure 4 The oil pipe 418 shown connects the first oil passage to the external oil pump.

[0054] In block 550, method 500 may include delivering cooling oil from an external oil pump into a first oil passage via a first oil pipe, and spraying the cooling oil from a first plurality of oil injection holes in the first oil passage onto the surface of a first support plate, thereby achieving rotor cooling.

[0055] In one embodiment, the axial flux motor may further include: a second end cover disposed outside the second rotor, wherein the second rotor includes a second rotor magnet and a second support plate in direct contact with the second rotor magnet, and the method 500 may further include: roughening the surface of the second support plate; arranging a second oil passage in the second end cover; providing a second plurality of oil injection holes in the second oil passage; connecting the second oil passage to an external oil pump via a second oil pipe; and sending cooling oil from the external oil pump into the second oil passage via the second oil pipe, and spraying the cooling oil from the second plurality of oil injection holes in the second oil passage onto the surface of the second support plate.

[0056] In one embodiment, method 500 may further include: when the temperature of the corresponding rotor exceeds a threshold, spraying cooling oil onto the surface of the support plate through the corresponding plurality of oil injection holes (e.g., for a predetermined time length).

[0057] In one embodiment, method 500 may further include: spraying cooling oil onto the surface of the support plate through corresponding plurality of oil injection holes according to the vehicle speed.

[0058] Reference above Figures 4-5 The axial flux motor and the method for cooling the axial flux motor according to the present invention are described in detail. By cleverly designing the cooling oil injection mechanism for the axial flux motor and / or providing a support plate with a rough surface, 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.

[0059] refer to Figure 6A computing device 600 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 600 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 600 or similar devices or systems.

[0060] The computing device 600 may include components that can be connected or communicated via one or more interfaces and a bus 602. For example, the computing device 600 may include a bus 602, one or more processors 604, one or more input devices 606, and one or more output devices 608. The one or more processors 604 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 606 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 608 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 600 may also include or be connected to a non-transient storage device 610. 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 610 may be detachable from an interface. The non-transient storage device 610 may have data / instructions / code for implementing the methods and steps described above. The computing device 600 may also include a communication device 612. The communication device 612 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.

[0061] When the computing device 600 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 600 can, for example, receive positioning data and sensor data indicating the vehicle's driving status. When the computing device 600 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.).

[0062] Furthermore, the non-transient storage device 610 may contain map information and software components, enabling the processor 604 to perform route guidance processing. Additionally, the output device 606 may include a display for showing a map, displaying vehicle location markers, and displaying images indicating the vehicle's driving status. The output device 606 may also include a speaker or headphone jack for audio guidance.

[0063] Bus 602 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 602 may also include Controller Area Network (CAN) bus or other architectures designed for automotive applications.

[0064] The computing device 600 may also include a working memory 614, which may be any type of working memory capable of storing instructions and / or data that are conducive to the operation of the processor 604, and may include, but is not limited to, random access memory and / or read-only memory devices.

[0065] Software components may reside in working memory 614, including but not limited to operating system 616, one or more application programs 618, drivers, and / or other data and code. Instructions for implementing the above methods and steps may be included in the one or more application programs 618, and the modules / units / components of the aforementioned various devices / servers / user equipment may be implemented by processor 604 reading and executing the instructions of the one or more application programs 618.

[0066] 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++).

[0067] 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 is located between the first rotor and the second rotor; as well as The first end cover is arranged on the outside of the first rotor. The first rotor includes a first rotor magnet and a first support plate that is in direct contact with the first rotor magnet, wherein the surface of the first support plate is rough. The first end cap includes: A first oil passage, the first oil passage including a first plurality of oil injection holes; as well as The first oil pipe is connected to the first oil passage and the external oil pump. Cooling oil can enter the first oil passage from the external oil pump via the first oil pipe, and be sprayed onto the surface of the first support plate from the first plurality of oil injection holes in the first oil passage.

2. The axial flux motor of claim 1, further comprising: The second end cap is located on the outside of the second rotor. The second rotor includes a second rotor magnet and a second support plate in direct contact with the second rotor magnet, wherein the surface of the second support plate is rough. The second end cap includes: A second oil passage, the second oil passage including a second plurality of oil injection holes; and The second oil pipe is connected to the second oil passage and the external oil pump. Cooling oil can enter the second oil passage from the external oil pump via the second oil pipe, and be sprayed onto the surface of the second support plate from the second plurality of oil injection holes in the second oil passage.

3. The axial flux motor as claimed in claim 1, wherein the surface of the first support plate includes one or more of the following: a protrusion, a recess, or a scraped surface.

4. The axial flux motor as claimed in claim 1, wherein the first oil passage is an annular oil passage, and the first plurality of oil injection holes are evenly distributed in the annular oil passage.

5. The axial flux motor of claim 1, wherein the first plurality of oil injection holes are further configured as follows: When the temperature of the first rotor exceeds the threshold, cooling oil is sprayed onto the surface of the first support plate.

6. The axial flux motor of claim 1, wherein the first plurality of oil injection holes are further configured as follows: Cooling oil is sprayed onto the surface of the first support plate according to the vehicle's speed.

7. The axial flux motor as claimed in claim 1, wherein the axial flux motor is used as an electric drive for an electric vehicle.

8. A method for cooling an axial flux motor, the axial flux motor comprising: First rotor; Second rotor; The stator is located between the first rotor and the second rotor; as well as The first end cover is arranged on the outside of the first rotor. The first rotor includes a first rotor magnet and a first support plate that is in direct contact with the first rotor magnet. The method includes: The surface of the first support plate is roughened. A first oil passage is arranged in the first end cap; A first plurality of injection holes are provided in the first oil passage; The first oil passage is connected to the external oil pump via the first oil pipe; and Cooling oil is pumped from the external oil pump into the first oil passage via the first oil pipe, and the cooling oil is sprayed from the first plurality of oil injection holes in the first oil passage onto the surface of the first support plate.

9. The method of claim 8, wherein the axial flux electric machine further comprises: A second end cap is disposed on the outside of the second rotor, wherein the second rotor includes a second rotor magnet and a second support plate that is in direct contact with the second rotor magnet. The method further includes: The surface of the second support plate is roughened. A second oil passage is arranged in the second end cap; A second plurality of injection holes are provided in the second oil passage; The second oil passage is connected to the external oil pump via a second oil pipe; and Cooling oil is pumped from the external oil pump into the second oil passage via the second oil pipe, and the cooling oil is sprayed from the second plurality of oil injection holes in the second oil passage onto the surface of the second support plate.

10. The method of claim 8, wherein the surface of the first support plate includes one or more of the following: a protrusion, a recess, or a scraped surface.

11. The method of claim 8, wherein the first oil passage is an annular oil passage, and the first plurality of injection holes are uniformly distributed in the annular oil passage.

12. The method of claim 8, further comprising: When the temperature of the first rotor exceeds the threshold, cooling oil is sprayed onto the surface of the first support plate through the first plurality of oil injection holes.

13. The method of claim 8, further comprising: Cooling oil is sprayed onto the surface of the first support plate through the first plurality of oil injection holes according to the vehicle speed.

14. The method of claim 8, wherein the axial flux motor is used as an electric drive for an electric vehicle.

15. A vehicle comprising an axial flux motor as claimed in any one of claims 1-7.

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