Axial flux motor

Abstract

The invention discloses an axial magnetic flux motor, which comprises a shell and a power module, and is characterized in that a mounting groove is formed in the shell; the power module is arranged in the mounting groove, the power module comprises a stator and a rotor, the rotor and the stator are arranged oppositely in the axial direction and can rotate relative to the stator, and an air gap is formed between the rotor and the stator; the shell forms a liquid cooling cavity at one axial end of the power module, and the air gap and the liquid cooling cavity are positioned on two sides of the stator; the axial magnetic flux motor is provided with a connecting air duct and an axial air duct, the connecting air duct is close to the liquid cooling cavity, and the axial air duct communicates with the connecting air duct and the air gap. Under the combined heat exchange action of an air cooling form and a water cooling form, the power module can be effectively cooled in time, a fan does not need to be used, a relatively complex air duct structure does not need to be arranged, and the overall structure compactness and form simplification of the axial flux motor are facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of axial flux motors, and in particular to an axial flux motor. Background Art

[0002] For example, permanent magnet synchronous motors, such as axial flux motors, generally generate heat during continuous operation due to eddy current loss, hysteresis loss, air friction loss, etc. This heat can easily cause the temperature of the rotor permanent magnet to increase, resulting in a decrease in the magnetic properties of the permanent magnet, affecting the continuous torque of the motor. Summary of the invention

[0003] The main purpose of the present invention is to provide an axial flux motor, aiming to solve the problem that the traditional axial flux motor is prone to generate heat during continuous operation, resulting in a decrease in motor performance.

[0004] To achieve the above object, the present invention provides an axial flux motor, comprising:

[0005] a housing formed with a mounting groove; and

[0006] A power module is arranged in the installation groove, the power module comprises a stator and a rotor, the rotor is arranged opposite to the stator along the axial direction and is rotatable relative to the stator, and an air gap is formed between the rotor and the stator;

[0007] Wherein, the housing is formed with a liquid cooling cavity at one axial end of the power module, and the air gap and the liquid cooling cavity are located on both sides of the stator;

[0008] The axial flux motor is provided with a connecting air duct and an axial air duct, the connecting air duct is close to the liquid cooling cavity, and the axial air duct communicates with the connecting air duct and the air gap.

[0009] Optionally, at least a partial air duct section of the connecting air duct is axially embedded in the liquid cooling cavity, so that the orthographic projection of the connecting air duct in the radial direction at least partially overlaps with the orthographic projection of the liquid cooling cavity in the same radial direction.

[0010] Optionally, the embedding depth of the connecting air duct in the liquid cooling cavity is not greater than the axial height of the liquid cooling cavity; and / or,

[0011] The radial dimension of the connecting air duct is not greater than the radial dimension of the liquid cooling cavity.

[0012] Optionally, the shell is provided with a convex hump on the cavity wall at one end of the liquid cooling cavity close to the mounting groove, and a plurality of the convex hump are dispersedly arranged in the liquid cooling cavity, and at least one connecting air duct is formed inside each of the convex hump.

[0013] Optionally, the convex hull is partially open;

[0014] The axial flux motor further comprises a cover plate, a plurality of which are provided corresponding to each of the convex humps, and each of the cover plate sealing covers is provided at the opening of the corresponding convex hump.

[0015] Optionally, the housing includes an end cover arranged axially opposite to the stator, and a side cover extending axially from the periphery of the end cover, the end cover and the side cover jointly define the mounting groove, the end cover is provided with the liquid cooling cavity, and the end cover is provided with the connecting air duct on a side of the liquid cooling cavity close to the mounting groove;

[0016] The end cover is axially penetrated with a plug hole communicating with the connecting air duct and the mounting groove;

[0017] The axial flux motor further comprises a tube body, a section of which is inserted and fixed in the insertion hole, and another section of which is elongated and extends toward the air gap. The tube body defines at least a partial air duct section of the axial air duct.

[0018] Optionally, the tube body includes a first tube section inserted and fixed in the insertion hole, and a second tube section exposed outside the insertion hole; wherein,

[0019] The outer peripheral side wall of the first pipe section and / or the hole wall of the insertion hole are provided with a detachable connection structure; and / or,

[0020] The axial flux motor further includes glue filled between the outer peripheral side wall of the first pipe segment and the hole wall of the insertion hole; and / or,

[0021] The end portion and / or the outer peripheral side wall of the second pipe section is provided with an operating structure for connecting and cooperating with an external tool; and / or,

[0022] The outer peripheral side wall of the second pipe section is provided with a rotation-stopping protrusion and / or a rotation-stopping recess for rotation-stopping connection with the curing glue filled in the installation groove; and / or,

[0023] The tube body is made of non-metallic material; and / or,

[0024] The end of the tube body extending into the installation groove extends to not exceed the stator setting.

[0025] Optionally, the stator comprises an iron core and a plurality of windings, the iron core comprises a yoke and a plurality of teeth protruding from one axial end of the yoke, and the plurality of windings are wound around the plurality of teeth in a one-to-one correspondence;

[0026] The inner wall of the winding is spaced apart from the outer peripheral side wall of the corresponding tooth portion, and the axial air duct is at least partially formed at the space.

[0027] Optionally, the shell is further provided with a first branch air duct extending from one end of the liquid cooling cavity facing away from the power module, and second branch air ducts are respectively opened axially on both radial sides of the liquid cooling cavity, and the second branch air ducts are respectively connected to the connecting air duct and the first branch air duct;

[0028] The liquid cooling chamber is connected to the first branch air duct and the second branch air duct respectively for heat exchange.

[0029] Optionally, two shells are provided, and the two shells are detachably connected at the notches of the two mounting slots; and / or,

[0030] In the power module, two stators are provided at two axial ends of the rotor or two rotors are provided at two axial ends of the stator to form two air gaps.

[0031] In the technical solution provided by the present invention, the installation cavity formed by the shell can well accommodate and protect the power module; when the rotor rotates relative to the stator, it is easy to generate a large amount of heat in the air gap. The present application forms an annular air-cooling flow path by connecting the air gap, two axial air ducts and the connecting air duct in sequence, so that under the drive of, for example, the pressure difference formed by the rotation of the rotor, the hot air formed in the air gap will automatically flow along an axial air duct to the connecting air duct; and because one axial end of the liquid-cooling cavity is connected to the connecting air duct for heat exchange, it helps to cool the hot air flowing through the connecting air duct to obtain cold air with a lower temperature. The cold air is continuously pushed by the upstream hot air and flows along the other axial air duct to the air gap, cooling the stator and rotor in the air gap, and helping to prevent the rotor from being damaged by high temperature; in addition, because the other axial end of the liquid-cooling cavity can also be directly connected to the adjacent stator or rotor for heat exchange, it helps to directly cool the adjacent stator or rotor. Under the combined heat exchange of air cooling and water cooling, the present application can effectively cool down the power module in a timely manner without the aid of air-discharging devices such as fans, and does not require the setting of relatively complex air duct structures. This helps to make the overall structure of the axial flux motor compact and simple in form, thereby improving the reliability of the entire machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0033] Figure 1 A three-dimensional schematic diagram of an embodiment of the axial flux motor provided by the present invention;

[0034] Figure 2 for Figure 1 A three-dimensional schematic diagram of the central axial flux motor after removing the second shell monomer;

[0035] Figure 3 for Figure 2 A three-dimensional schematic diagram of the central axial flux motor with the cover plate and part of the tube removed;

[0036] Figure 4 for Figure 2 A three-dimensional schematic diagram of the central axial flux motor with the housing removed;

[0037] Figure 5 for Figure 1 A schematic diagram of the axial cross section of the medium axial flux motor;

[0038] Figure 6 for Figure 5 A schematic diagram of the enlarged structure at A in the middle;

[0039] Figure 7 for Figure 1 A schematic cross-sectional view of a medium axial flux motor cut along a radial direction where a connecting air duct is located;

[0040] Figure 8 for Figure 7 A schematic diagram of the enlarged structure at B in the middle;

[0041] Fig. 9 for Figure 2 A three-dimensional schematic diagram of the middle tube body at one viewing angle;

[0042] Fig.10 for Figure 2 A three-dimensional schematic diagram of the middle tube body from another perspective.

[0043] Description of Figure Numbers:

[0044] 100 shell; 101 mounting groove; 110 first shell monomer; 111 end cover; 111a groove; 111b first step surface; 112 side cover; 113 inlet; 114 outlet; 115 cone; 116 convex bump; 116a first plug hole; 116b second plug hole; 117 boss; 117a second step surface; 118 rib; 119 cover plate; 120 second shell monomer; 121 avoidance hole; 200 stator; 210 core; 211 yoke; 212 tooth; 213 slot; 220 winding; 300 rotor; 401 first tube body; 402 second tube body; 410 first pipe section; 411 detachable connection structure; 420 second pipe section; 421 operating structure; 422 anti-rotation recess; X1 air gap; X2 axial inner air duct; X3 axial outer air duct; X4 connecting air duct; Y liquid cooling chamber.

[0045] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0048] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0049] See also Figures 1 to 10 The present application provides an axial flux motor, and specifically, the axial flux motor includes a housing 100 and a power module. The housing 100 is formed with a mounting groove 101; the power module is arranged in the mounting groove 101, and the power module includes a stator 200 and a rotor 300, the rotor 300 is arranged opposite to the stator 200 along the axial direction, and can be rotatably arranged relative to the stator 200, and an air gap X1 is formed between the rotor 300 and the stator 200; wherein the housing 100 is formed with a liquid cooling cavity Y at one axial end of the power module, and the air gap and the liquid cooling cavity Y are located on both sides of the stator; the axial flux motor is provided with a connecting air duct X4 and an axial air duct, the connecting air duct X4 is close to the liquid cooling cavity, and the axial air duct connects the connecting air duct X4 and the air gap X1.

[0050] In the technical solution provided by the present application, the installation cavity formed by the shell 100 can well accommodate and protect the power module; when the rotor 300 rotates relative to the stator 200, it is easy to generate a large amount of heat at the air gap X1. The present application forms an annular air-cooling flow path by sequentially connecting the air gap X1, two axial air ducts and the connecting air duct X4, so that, driven by the pressure difference formed by the rotation of the rotor 300, the hot air formed at the air gap X1 will automatically flow along an axial air duct to the connecting air duct X4; and because one axial end of the liquid-cooling cavity Y is connected to the Connecting the air duct X4 for heat exchange connection helps to cool down the hot air flowing through the connecting air duct X4, obtaining cold air with a lower temperature. The cold air is continuously pushed by the upstream hot air and flows along another axial air duct to the air gap X1, cooling down the stator 200 and the rotor 300 at the air gap X1, helping to prevent the rotor 300 from being damaged by high temperature. In addition, since the other axial end of the liquid cooling chamber Y can also be directly connected to the adjacent stator 200 or rotor 300 for heat exchange, it helps to directly cool down the adjacent stator 200 or rotor 300. Under the combined heat exchange of air cooling and water cooling, the present application can effectively cool down the power module in a timely manner without the aid of an air drive device such as a fan, and does not require a relatively complex air duct structure, which helps to make the overall structure of the axial flux motor compact and simplified, and improve the reliability of the whole machine.

[0051] In the present application, for ease of understanding, the axial flux motor as a whole and its components have uniform axial, radial and circumferential directions.

[0052] The housing 100 has a mounting groove 101 recessed at one axial end. The mounting groove 101 is not limited in the formation method. For example, the housing 100 may include an end cover 111 and a side cover 112 extending axially from the periphery of the end cover 111. The end cover 111 and the side cover 112 together define the mounting groove 101. The end cover 111 and the side cover 112 may be integrally formed; or the end cover 111 and the side cover 112 may be separately formed and then detachably or non-detachably connected.

[0053] The shape and size of the mounting groove 101 should be roughly matched with the overall shape and size of the power module accommodated in the mounting groove 101. For example, the groove depth (i.e., the axial size) of the mounting groove 101 should not be less than the overall axial size of the stator 200 and the rotor 300. In order to make the overall shape of the axial flux motor regular and beautiful, the end cover 111 is generally set to be circular or quasi-circular, and the side cover 112 extends along the circumferential direction of the end cover 111, so that the end cover 111 and the side cover 112 are generally cylindrical as a whole.

[0054] In addition, the specific form of the power module received by the installation slot 101 is also not limited, according to actual needs:

[0055] The power module may include a stator 200 and a rotor 300. In one embodiment, the stator 200 may be arranged closer to the bottom of the mounting slot 101 (that is, closer to the liquid cooling chamber Y), and the rotor 300 may be arranged closer to the notch of the mounting slot 101. Or in another embodiment, the rotor 300 may be arranged closer to the bottom of the mounting slot 101 (that is, closer to the liquid cooling chamber Y), and the stator 200 may be arranged closer to the notch of the mounting slot 101. When the stator 200 and the rotor 300 are both arranged as one, it can be understood that an air gap X1 is formed at the opposite interval between the stator 200 and the rotor 300.

[0056] Alternatively, the power module can also be Figures 1 to 10 As shown, it specifically includes two stators 200 and a rotor 300. The two stators 200 are arranged at the two axial ends of the rotor 300, so at least one stator 200 is arranged close to the bottom of the installation slot 101 (that is, closer to the liquid cooling chamber Y). Two air gaps X1 can be formed between the two stators 200 and the rotor 300. According to actual needs, the two air gaps X1 may be axially connected or not axially connected.

[0057] Alternatively, the power module may also specifically include a stator 200 and two rotors 300. The two rotors 300 are disposed at the two axial ends of the stator 200, so at least one rotor 300 is disposed close to the bottom of the mounting slot 101 (i.e., closer to the liquid cooling chamber Y). Two air gaps X1 are also formed between the two rotors 300 and the stator 200. According to actual needs, the two air gaps X1 may or may not be axially conductive.

[0058] One or two of the above-mentioned stators 200 and rotors 300 are coaxially installed. Therefore, for the axial flux motor, an axial hole is provided along its central axis, which makes the shape of the stator 200, the rotor 300 and the housing 100 (for example, the end cover 111) roughly annular. Of course, since the main improvement of the present application is not in the power module itself, its specific installation method, the power drive method of the rotor 300, etc. can refer to the prior art and will not be described in detail here.

[0059] The liquid cooling chamber Y is formed on the housing 100 and is located at one axial end of the power module:

[0060] Specifically, when the housing 100 includes the end cover 111 and the side cover 112 as described above, the end cover 111 is roughly annular due to the above-mentioned axial hole, that is, the end cover 111 roughly reserves an annular space for the liquid cooling cavity Y to form. Based on this, the formation method of the liquid cooling cavity Y in the annular space is not limited: for example, the liquid cooling cavity Y can be set as one, and the liquid cooling cavity Y is set to cover almost the entire annular space or cover a local area of ​​the annular space according to actual needs. Or for example, the liquid cooling cavity Y can be set as at least two, and all or some of the liquid cooling cavities Y can be selectively connected or disconnected. The arrangement of each liquid cooling cavity Y on the end cover 111 can be various. For example, when each liquid cooling cavity Y extends in an elongated shape along the radial direction of the axial flux motor, each liquid cooling cavity Y can be radially arranged along the periphery of the central axis of the axial flux motor. Alternatively, when each liquid cooling cavity Y extends in an elongated shape along the circumferential direction of the axial flux motor, each liquid cooling cavity Y can be arranged concentrically and in multiple circles along the outer circumference of the central axis of the axial flux motor.

[0061] The liquid cooling chamber Y is used to connect the cooling liquid. Specifically, if the temperature of the hot air generated at the air gap X1 is the first temperature and the temperature of the cooling liquid in the liquid cooling chamber Y is the second temperature in the continuous operation state, the second temperature is at least lower than the first temperature, so as to achieve the purpose of cooling the first temperature. Since hot air will continue to be generated at the air gap X1 in the continuous operation state, in order to meet the real-time heat dissipation requirements of the power module, the temperature of the cooling liquid in the liquid cooling chamber Y needs to be maintained at the second temperature or lower than the second temperature for as long as possible. To this end:

[0062] In one embodiment, the axial flux motor may further include a refrigeration device. The refrigeration device acts in the liquid cooling cavity Y to cool and cool the coolant in the liquid cooling cavity Y in real time or periodically. At this time, the coolant in the liquid cooling cavity Y may be in a non-flowing state or in a flowing state. The refrigeration device may be, but is not limited to, one or more of a mechanical compression refrigeration device, an absorption refrigeration device, a semiconductor refrigeration device, and the like.

[0063] Or in another scheme, Figures 1 to 4 As shown, the outer wall of the housing 100 is provided with an inlet 113 and an outlet 114 connected to the liquid cooling chamber Y. The axial flux motor may further include an external water source and a pump body. Driven by the pump body, the external water source connects the coolant having a temperature not higher than the second temperature into the liquid cooling chamber Y through the inlet 113, flows through the entire liquid cooling chamber Y, and finally connects the liquid cooling chamber Y through the outlet 114 and returns to the external water source. At this time, the coolant in the liquid cooling chamber Y is in a continuous flow state.

[0064] The inlet 113 and the outlet 114 are generally independently and spaced apart at any position on the housing 100. Specifically, the inlet 113 and / or the outlet 114 may be provided at the axial end wall of the liquid cooling cavity Y, or at the radial outer wall of the liquid cooling cavity Y. For example Figure 2 As shown, the inlet 113 and the outlet 114 are both opened at the radial outer wall of the liquid cooling cavity Y.

[0065] In a further solution, the housing 100 may be provided with at least two ribs 118 dispersedly protruding in the liquid cooling chamber Y, and each rib 118 is arranged between the inlet 113 and the outlet 114, so that the liquid path flowing from the inlet 113 to the outlet 114 extends circuitously. Figures 2 to 4 As shown, when the inlet 113 and the outlet 114 are both opened at the radial outer wall of the liquid cooling cavity Y as described above, the provision of each rib 118 helps to extend the total path length of the liquid path from the inlet 113 to the outlet 114 as much as possible within the limited annular space, which on the one hand helps to stabilize the flow velocity of the coolant in the liquid cooling cavity Y; on the other hand, it helps to extend the total flow time of the coolant in the liquid cooling cavity Y, so that the coolant in the liquid cooling cavity Y can fully exchange heat with the power module and the annular air-cooling flow path.

[0066] It should be noted that, except for the inlet 113 and the outlet 114, other parts of the liquid cooling chamber Y need to be kept as closed as possible to prevent the coolant contained therein from leaking out, resulting in the coolant being unable to directly exchange heat with the power module and the annular air-cooling flow path.

[0067] The housing 100 is provided with a connecting air duct X4 at a position close to the liquid cooling chamber Y. The connecting air duct X4 may be provided at an axial end of the housing 100 close to the power module, and / or at an axial end of the housing 100 away from the power module. The following takes the housing 100 having a connecting air duct X4 at least at an axial end of the liquid cooling chamber Y close to the power module as an example:

[0068] The specific setting of the connecting air duct X4 can be the same as the above-mentioned liquid cooling chamber Y. Specifically, the shell 100 roughly reserves an annular space for the connecting air duct X4 to be formed. Based on this, the formation method of the connecting air duct X4 in the annular space is not limited: for example, the connecting air duct X4 can be set to one, and the connecting air duct X4 is set to cover almost the entire annular space or cover a local area of ​​the annular space according to actual needs. Or for example, the connecting air duct X4 can be set to at least two, and all or some of the connecting air ducts X4 can be selectively connected or disconnected. The arrangement of each connecting air duct X4 on the end cover 111 can be various. For example, when each connecting air duct X4 extends in an elongated shape along the radial direction of the axial flux motor, each connecting air duct X4 can be radially arranged along the periphery of the central axis of the axial flux motor. Alternatively, when each connecting air duct X4 extends in an elongated shape along the circumferential direction of the axial flux motor, each connecting air duct X4 can be concentrically and multi-circularly arranged along the outer circumference of the central axis of the axial flux motor.

[0069] It can be understood that one of the purposes of setting up the liquid cooling chamber Y is to at least be used to connect the connecting air duct X4 for heat exchange. On this basis, the heat exchange connection between the liquid cooling chamber Y and the connecting air duct X4 can be a contact heat exchange abutment or a non-contact heat exchange connection. Among them, the contact heat exchange abutment is, for example, to set the shell wall between the liquid cooling chamber Y and the connecting air duct X4 on the shell 100 to be at least partially made of heat conductive material. For example, the non-contact heat exchange connection achieves temperature neutralization of hot and cold air by means of heat radiation.

[0070] Based on this, to a certain extent, the larger the layout area of ​​the connecting air duct X4 in the annular space, the greater the gas flow rate will be, and then the heat exchange efficiency between the gas at the connecting air duct X4 and the liquid cooling chamber Y will be higher, and the heat exchange effect on the power module will be better.

[0071] Among them, when the connecting air duct X4 and the liquid cooling chamber Y are both set as one: if the connecting air duct X4 is defined to have a first orthographic projection area in the axial direction, and the liquid cooling chamber Y is defined to have a second orthographic projection area in the axial direction, then the overlapping area of ​​the first orthographic projection area and the second orthographic projection area is increased as much as possible. Specifically, the first orthographic projection area can be completely within the second orthographic projection area, so that the liquid cooling chamber Y can fully exchange heat with the airflow in the connecting air duct X4.

[0072] Of course, when the connecting air duct X4 and the liquid cooling chamber Y are respectively set to at least two, each connecting air duct X4 and each liquid cooling chamber Y are set to correspond one to one in the axial direction as much as possible. It should be noted that the one-to-one correspondence is not limited to the correspondence in quantity. According to actual needs, the connecting air duct X4 and the liquid cooling chamber Y can be set to the same number; or the same liquid cooling chamber Y can be connected to at least two connecting air ducts X4 for heat exchange; or the same connecting air duct X4 can be connected to at least two liquid cooling chambers Y for heat exchange. Among them, the connecting air duct X4 and the liquid cooling chamber Y correspondingly set in the axial direction can also be set as described above, so that the first orthographic projection area and the second orthographic projection area overlap as much as possible; or the first orthographic projection area is completely within the second orthographic projection area.

[0073] However, it is understandable that, in the present application, the second main purpose of the liquid cooling chamber Y can also be to connect with the stator 200 or the rotor 300 at an adjacent position for heat exchange. Since the connecting air duct X4 is arranged at one end of the liquid cooling chamber Y close to the power module, in order to achieve the above purpose, in actual application, the above first orthographic projection area can be appropriately reduced, so that the above second orthographic projection area, except for the overlapping area with the first orthographic projection area, can be directly connected with the power module for heat exchange in a contact or non-contact manner. Specifically, Figures 2 to 4 In the structure shown, the connecting air duct X4 does not cover the entire axial end surface of the liquid cooling chamber Y, but a plurality of connecting air ducts X4 are provided, and each connecting air duct X4 is substantially elongated and extends along the radial direction, and each connecting air duct X4 is correspondingly connected to two axial air ducts. Each connecting air duct X4 is not directly connected to each other.

[0074] In order to make the area of ​​the second orthographic projection area other than the overlapping area with the first orthographic projection area, that is, the area where the liquid cooling chamber Y is directly connected to the power module for heat exchange sufficiently close to the power module, in one embodiment, at least a partial air duct section of the connecting air duct X4 is axially embedded in the liquid cooling chamber Y, so that the orthographic projection of the connecting air duct X4 in the radial direction at least partially overlaps with the orthographic projection of the liquid cooling chamber Y in the same radial direction. Furthermore, the connecting air duct X4 can be completely embedded in the liquid cooling chamber Y in the axial direction, so that the orthographic projection of the connecting air duct X4 in the radial direction completely falls within the orthographic projection of the liquid cooling chamber Y in the same radial direction. In this way, compared with the axial end surface of the connecting air duct X4 close to the power module, the axial end surface of the liquid cooling chamber Y close to the power module can be fully in contact with the power module for heat exchange, which is particularly suitable for application scenarios when the stator 200 of the power module is closer to the liquid cooling chamber Y than the rotor 300.

[0075] In addition, by axially embedding at least a partial air duct section of the connecting air duct X4 into the liquid cooling chamber Y as described above, not only the axial end surface but also at least a portion of the radial side surfaces of the connecting air duct X4 can be in heat exchange contact with the liquid cooling chamber Y, which helps to fully increase the heat exchange area between the connecting air duct X4 and the liquid cooling chamber Y within the limited setting space of the liquid cooling chamber Y and the connecting air duct X4.

[0076] Next, in one embodiment, the embedding depth of the connecting air duct X4 in the liquid cooling cavity Y is not greater than the axial height of the liquid cooling cavity Y. In this way, the connecting air duct X4 will not occupy the entire axial space of the liquid cooling cavity Y. That is, the connecting air duct X4 will not block the liquid cooling cavity Y in the axial direction, so that sufficient space can be reserved between the connecting air duct X4 and the axial end cavity wall of the liquid cooling cavity Y for the coolant in the liquid cooling cavity Y to be distributed or circulated.

[0077] And / or in one embodiment, the radial dimension of the connecting air duct X4 is not greater than the radial dimension of the liquid cooling cavity Y. In this way, a single connecting air duct X4 will not occupy the entire radial space of the liquid cooling cavity Y. That is, the connecting air duct X4 will not block the liquid cooling cavity Y in the radial direction, so that sufficient space can be reserved between the connecting air duct X4 and the radial side cavity wall of the liquid cooling cavity Y for the coolant in the liquid cooling cavity Y to be distributed or circulated.

[0078] In view of the arrangement of an axial hole penetrating the central axis of the axial flux motor mentioned above, the housing 100 (specifically, the end cover 111) forms a truncated cone 115 on the periphery of the axial hole. The truncated cone 115 can strengthen the structural strength of the axial hole on the one hand, and it is easier to form the above-mentioned groove 111a structure on the other hand. If the outer peripheral side wall of the truncated cone 115 defines the first inner groove wall of the groove 111a, the second inner groove wall is radially opposite to the first inner groove wall. Then in practical application, the shell structure forming the connecting air duct X4 (specifically, the convex hump 116 in the following embodiment) can extend radially from the first inner groove wall of the groove 111a to the second inner groove wall connected to the groove 111a; or can extend radially from the first inner groove wall of the groove 111a to form a certain interval with the second inner groove wall of the groove 111a; or can extend radially from the second inner groove wall of the groove 111a to form a certain interval with the first inner groove wall of the groove 111a; or can be radially arranged between the first inner groove wall and the second inner groove wall. The shell structure forming the connecting air duct X4 may be integrally formed with the end cover 111, or may be detachably or non-detachably connected after being separately formed.

[0079] In view of the above description of the shell 100, it can be understood that when the molding technology is sufficiently supported, the shell 100 can be specifically manifested as being composed of a shell monomer. At this time, the liquid cooling chamber Y and the connecting air duct X4 can both be directly and independently molded from the shell monomer. However, in order to reduce the difficulty of molding, specifically, the shell 100 can be provided to include at least two shell monomers spliced ​​in sequence along the axial direction, and each shell monomer can be independently processed and molded. Therefore, the specific structural shapes of each shell monomer can be set to be the same or at least partially different according to actual needs. Among them, the specific structural form can be but is not limited to one or more of shape, size, material, etc.

[0080] The number of shell monomers can be set according to actual needs. However, it can be understood that if the number of shell monomers is large, the processing difficulty of a single shell monomer can be simplified, but it may easily increase the structural complexity of the whole machine, resulting in, for example, complex processing technology, inconvenient disassembly and assembly of the whole machine, and it is easy to increase the size of the whole machine to a certain extent; on the contrary, if the number of shell monomers is small, it is easy to increase the processing difficulty of a single shell monomer, but it can simplify the disassembly and assembly of the whole machine to a certain extent. Therefore, in actual application, the number of shell monomers needs to be maintained within a reasonable range, for example, it can be two or three.

[0081] When the housing 100 includes at least two shell monomers as described above, at least one of the shell monomers can be individually molded into a liquid cooling cavity Y or a connecting air duct X4. For example, when the housing 100 includes two shell monomers, one of the shell monomers can be individually molded into a liquid cooling cavity Y, and the other shell monomer can be individually molded into a connecting air duct X4; or one of the shell monomers can be individually molded into a liquid cooling cavity Y, and together with the other shell monomer, they can enclose and define the connecting air duct X4; or one of the shell monomers can be individually molded into a connecting air duct X4, and together with the other shell monomer, they can enclose and define the liquid cooling cavity Y.

[0082] Alternatively, when the housing 100 includes at least two shell monomers as described above, each shell monomer may jointly enclose and define the liquid cooling cavity Y and / or the connecting air duct X4. For example, when the housing 100 includes three shell monomers, the shell monomer located in the middle may enclose and define the liquid cooling cavity Y with one of the remaining two shell monomers, and enclose and define the connecting air duct X4 with the other of the remaining two shell monomers. Alternatively, a shell monomer located on both sides may enclose and define the liquid cooling cavity Y with the shell monomer located in the middle, and enclose and define the connecting air duct X4 with the remaining other shell monomer.

[0083] Specifically, the housing 100 forms the above-mentioned liquid cooling chamber Y in the following manner: Figures 1 to 4 , the housing 100 may include a first housing monomer 110 and a second housing monomer 120 .

[0084] One axial end of the first shell monomer 110 is recessed to form the above-mentioned mounting groove 101, and the other axial end is recessed to form a groove 111a. Specifically, the first shell monomer 110 may include the end cover 111 and the side cover 112 as described above, and the end cover 111 and the side cover 112 together enclose the mounting groove 101. The end cover 111 alone, or the side cover 112 is extended in the reverse direction and together with the end cover 111, encloses and defines the groove 111a.

[0085] The second shell monomer 120 is covered at the notch of the first groove section to enclose and define the liquid cooling chamber Y together with the first groove section. Specifically, the second shell monomer 120 can be directly covered on the axial end surface of the first shell monomer 110. Or when the first shell monomer 110 is expanded near the notch of the groove 111a to form a first step surface 111b, the axial end surface of the second shell monomer 120 can be supported on the first step surface 111b, and the axial end surface of the second shell monomer 120 and the axial end surface of the first shell monomer 110 located on the peripheral side of the groove 111a are substantially flush.

[0086] In order to achieve a sealed connection between the second shell monomer 120 and the first shell monomer 110, the side surface of the second shell monomer 120 and the side groove wall of the groove 111a at the location are directly or indirectly sealed and abutted. The above-mentioned sealed connection can be achieved through size design, such as a certain degree of interference fit connection; or can be achieved through an external structure, such as a sealing ring or other structural connection.

[0087] In addition, further, in one embodiment, the first shell monomer 110 is provided with at least two bosses 117 dispersedly protruding from the bottom wall of the groove 111a, and the second shell monomer 120 is supported on the end of each boss 117. In view of the above, it can be known that the second shell monomer 120 is connected to the first shell monomer 110 through the first step surface 111b on the circumferential side, and the design of the boss 117 can axially support the second shell monomer 120 in the middle, which helps to increase the axial support area of ​​the first shell monomer 110 and the second shell monomer 120, so that the shape of the liquid cooling cavity Y formed by the two shell monomers is more stable.

[0088] Further, when the stator 200 is located between the rotor 300 and the first shell monomer 110, the above-mentioned bosses 117 can not only be used to support the second shell monomer 120, but also can be reused to provide sufficient space and strength to achieve a stable connection between the stator 200, the first shell monomer 110 and the second shell monomer 120. Specifically, the axial flux motor also includes a plurality of connectors, each connector is correspondingly arranged at each boss 117, and sequentially connects the second shell monomer 120, the first shell monomer 110 and the stator 200. The specific structure of the connector is not limited, for example, it can be but not limited to: when one or more threaded holes are opened at corresponding positions of the stator 200, the boss 117 and the second shell monomer 120, the connector can be specifically set as a screw connector, which is screwed with each threaded hole one by one. Alternatively, when one or more pin holes are provided at corresponding positions of the boss 117 and the second shell monomer 120, and the stator 200 is provided with a pin shaft protruding at the corresponding pin hole, the connecting member can be specifically configured as a nut or a clamping ring structure to be connected and fixed to the shaft section of each pin shaft extending out of the pin hole.

[0089] Based on this, in practical applications, the second shell monomer 120 can be directly supported on the entire axial end surface of each boss 117, or supported on a partial axial end surface of each boss 117. When the second shell monomer 120 is directly supported on a partial axial end surface of each boss 117, as shown in FIG. Figures 2 to 4 As shown, the outer circumference of the boss 117 is convexly formed with a second step surface 117a, and the second shell monomer 120 is provided with an avoidance hole 121 corresponding to each boss 117. The second shell monomer 120 is supported on the second step surface 117a, and the avoidance hole 121 allows the boss 117 to extend out of the second step surface 117a. At least part of the boss 117 extends outward from the second shell monomer 120 and can be exposed on the outer wall of the entire axial flux motor, which is convenient for operating the connecting member to achieve the purpose of connecting and fixing the stator 200, the first shell monomer 110 and the second shell monomer 120.

[0090] It should be noted that, when the boss 117 and the rib 118 are provided at the same time in an embodiment, the rib 118 may be formed by extending from the side wall of at least one boss 117, or the rib 118 may be formed by extending from the side groove wall at any position of the first groove section. The extension direction of the rib 118 may be radial, circumferential, tangential, etc. The rib 118 may be in a straight line shape, or in an arc shape formed by one or more bends.

[0091] Specifically, the shell 100 forms the above-mentioned connecting air duct X4 in which at least a partial air duct section is embedded in the liquid cooling chamber Y, for example: Figures 1 to 4The housing 100 is provided with a convex bump 116 on one end of the liquid cooling cavity Y near the mounting groove 101. A plurality of convex bumps 116 are dispersedly provided in the liquid cooling cavity Y, and at least one connecting air duct X4 is formed inside each convex bump 116. When the housing 100 includes the first shell monomer 110 and the second shell monomer 120 as described above, the convex bump 116 can be convexly provided at the bottom wall of the groove 111a, and can be spaced as far as possible from the boss 117, the rib 118 and other structures. At this time, the convex bump 116 can be provided in plurality, and each convex bump 116 can be extended in an elongated shape along a radial direction of the housing 100.

[0092] Furthermore, the convex hump 116 is partially opened; the axial flux motor further comprises a cover plate 119, and a plurality of cover plates 119 are provided corresponding to each convex hump 116, and each cover plate 119 sealing cover is provided at the opening of the corresponding convex hump 116. Specifically, the opening of the convex hump 116 can be formed in the groove 111a, and at any position of the convex hump 116, for example, at the position of the convex hump 116 facing the notch of the groove 111a, or at the position of the convex hump 116 facing any side groove wall of the groove 111a, etc. Of course, the opening of the convex hump 116 can also be formed outside the groove 111a, for example, an opening is provided at the groove bottom of the mounting groove 101 corresponding to the convex hump 116. The size and shape of the opening of the convex hump 116 are not limited. The cover plate 119 is adapted to the size and shape of the opening, and the cover plate 119 and the opening can be sealed and connected detachably or non-detachably to prevent the coolant in the liquid cooling chamber Y from entering the connecting air duct X4.

[0093] In view of one or more of the above embodiments, regarding the setting of the axial air duct:

[0094] It can be understood that the axial air duct is formed by the axial flux motor, so there is no restriction on the specific opening position thereof, according to actual needs:

[0095] The axial air duct can be directly opened at the housing 100. For example, when the housing 100 includes the end cover 111 and the side cover 112 as described above, and the end cover 111 defines the liquid cooling chamber Y and the connecting air duct X4, if the radial thickness of the side cover 112 is sufficient, a channel can be directly opened axially at the side cover 112, one port of the channel is connected to the connecting air duct X4, and the other port of the channel is connected to the mounting groove 101, and the channel constitutes the axial air duct. At this time, the port connecting the axial air duct and the mounting groove 101 can be arranged sufficiently close to and as close to the air gap X1 as possible, and the plane where the port is located can be approximately perpendicular to the air gap X1, or inclined at a certain angle relative to the air gap X1 to form an oblique opening.

[0096] Under the premise of not affecting the normal operation of the power module, the axial air duct can also be directly opened at the power module. For example, when the stator 200 is closer to the liquid cooling chamber Y and the connecting air duct X4 relative to the rotor 300, a channel can be directly opened axially at the stator 200, one port of the channel is connected to the connecting air duct X4, and the other port of the channel is connected to the air gap X1, and the channel constitutes the axial air duct. At this time, specifically, if the stator 200 includes an iron core 210 and a plurality of windings 220, the iron core 210 includes a yoke 211 and a plurality of teeth 212 protruding from one axial end of the yoke 211, and the plurality of windings 220 are wound one by one at the plurality of teeth 212, and a slot 213 is defined between each two adjacent teeth 212, the axial air duct can pass through the teeth 212 via the yoke 211, or be opened at the slot 213 via the yoke 211. The axial air duct may be provided on the outer side of the winding 220 or on the inner side of the winding 220 .

[0097] Of course, the axial air duct can also be directly opened in other components of the axial flux motor except the housing 100 and the power module.

[0098] It should be noted that, according to actual needs, the axial air duct can also be opened in one or more of the above-mentioned shell 100, power module and other components without limitation. For example, when the power module is accommodated in the installation groove 101, and the power module does not completely occupy the entire space in the installation groove 101, a certain vacant space may be formed on the radial inner side and / or radial outer side of the power module. At this time, the vacant space can be fully utilized and directly used as a local air duct section of the axial air duct, and then a hole-like structure connecting the vacant space and the connecting air duct X4 is opened in the shell 100 to form the remaining air duct section of the axial air duct.

[0099] Specifically, as described above, when the stator 200 includes an iron core 210 and a plurality of windings 220, the iron core 210 includes a yoke 211 and a plurality of teeth 212 protruding from one axial end of the yoke 211, and the plurality of windings 220 are wound around the plurality of teeth 212 in a one-to-one correspondence:

[0100] Among them, a slot 213 is defined between every two adjacent teeth 212. Then, the slot 213 and the corresponding side slot wall of the mounting slot 101 can jointly enclose the above-mentioned vacant space of sufficient size. At this time, the vacant space formed between the slot 213 and the corresponding side slot wall of the mounting slot 101 can be fully utilized to form a partial air duct section of the axial air duct.

[0101] Among them, for example, the winding 220 formed by winding the copper wire around the tooth portion 212 for multiple turns has a radial size larger than the corresponding yoke 211, and the inner circle area of ​​the winding 220 is at least partially formed on the radial outside and / or radial outside of the yoke 211, the inner circle area formed on the radial outside and / or radial outside of the yoke 211 constitutes the above-mentioned vacant space, which can be used to form a partial air duct section of the axial air duct.

[0102] Alternatively, for example, the winding 220 formed by winding the copper wire around the tooth portion 212 for multiple turns has a radial size larger than the corresponding tooth portion 212, so that a point gap is formed between the inner wall of the winding 220 and the outer peripheral side wall of the corresponding tooth portion 212. The gap defines the above-mentioned vacant space, which can be used to form a local air duct section of the axial air duct.

[0103] In order to fully reduce the occupation of the above-mentioned vacant space, for example, in one embodiment, when the winding 220 has a lead wire. The lead wire is also a three-phase lead wire. The above-mentioned vacant space can be avoided as much as possible by reasonably setting the routing area of ​​the lead wire in the mounting groove 101. Specifically, if the stator 200 is defined as having a third orthographic projection along the axial direction, the maximum radial range of the third orthographic projection may be defined by the yoke 211, or may be defined by the winding 220. The above-mentioned vacant space is basically located outside the maximum radial range of the third orthographic projection. Therefore, the routing area of ​​the lead wire is set so that the orthographic projection along the axial direction does not exceed the third orthographic projection, so that the routing area of ​​the lead wire does not occupy the space for opening the axial air duct, and the overall structure is made more compact and reasonable.

[0104] In view of the above, in actual application, when the power module is assembled in the installation slot 101, curing glue will be poured on the circumference of the stator 200, for example. The curing glue may occupy the above-mentioned vacant space, making it inconvenient to directly open the axial air duct. And the curing glue may also cause the local air duct section of the opened axial air duct to be blocked. Therefore, in order to improve the structural quality of the axial air duct, please combine Figures 9 and 10 In one embodiment, the end cover 111 is provided with a plug hole connecting the air duct X4 and the mounting groove 101 along the axial direction; the axial flux motor also includes a tube body, one section of the tube body is inserted and fixed in the plug hole, and the other section is elongated in the direction of the air gap X1, and the tube body defines at least a partial air duct section of the axial air duct. With the arrangement of the tube body, the axial air duct can be effectively and relatively easily formed in the poured curing glue.

[0105] Specifically, the pipe body includes a first pipe section 410 inserted and fixed in the insertion hole, and a second pipe section 420 exposed outside the insertion hole.

[0106] The first pipe section 410 is mainly used for inserting and connecting the jack. In one application, the outer diameter of the first pipe section 410 and the inner diameter of the jack can be reasonably set so that the first pipe section 410 and the jack can be directly interference-connected. Or in another application, the outer peripheral side wall of the first pipe section 410 and / or the hole wall of the jack are provided with a detachable connection structure 411. The first pipe section 410 and the jack can be connected via the detachable connection structure 411. The detachable connection structure 411 may include but is not limited to threaded holes and screw connections, snap fasteners and buckle holes, magnetic suction parts, adhesive parts, etc.

[0107] Furthermore, in order to strengthen the connection strength between the first pipe segment 410 and the plug hole, the axial flux motor may also include glue filled between the outer peripheral side wall of the first pipe segment 410 and the hole wall of the plug hole. On the one hand, the glue can increase the connection strength between the first pipe segment 410 and the plug hole alone or on the basis of the detachable connection structure 411; on the other hand, the glue can fill the assembly gap that may exist between the first pipe segment 410 and the plug hole, and to a certain extent prevent the curing glue injected on the circumference of the stator 200 from entering the plug hole or the pipe mouth of the first pipe segment 410, resulting in the axial air duct being blocked.

[0108] There is no limit to the insertion depth between the first pipe section 410 and the jack. The first pipe section 410 can be completely inserted into the entire jack, so that the pipe mouth of the first pipe section 410 is substantially flush with the hole of the jack, or slightly extends outward from the hole of the jack. In this case, the first pipe section 410 directly defines the entire axial air duct. Alternatively, the first pipe section 410 can be inserted into a partial hole section of the jack, so that the pipe mouth of the first pipe section 410 is located in the jack. In this case, the jack and the first pipe section 410 jointly define the entire axial air duct.

[0109] The second pipe section 420 is mainly arranged in the installation groove 101, and the pipe opening of the second pipe section 420 is sufficiently close to the air gap X1, which helps to maintain the conduction of the axial air duct when the curing glue is poured.

[0110] When the first pipe segment 410 is detachably connected to the socket as described above, further, the end and / or the outer peripheral side wall of the second pipe segment 420 is provided with an operating structure 421 for connecting and cooperating with an external tool. The operating structure 421 is compatible with the detachable connection structure 411 and the external tool. For example, when the detachable connection structure 411 is an internal thread set in the socket and an external thread set in the first pipe segment 410, if the external tool is a slotted, cross or hexagonal screwdriver, etc., the operating structure 421 is a slotted, cross slot or hexagonal structure set at the end of the second pipe segment 420. The provision of the operating structure 421 helps to match the external tool, so that the detachable connection of the first pipe segment 410 in the socket can be more easily achieved with the help of the external tool.

[0111] In addition, the outer peripheral side wall of the second pipe section 420 is provided with a rotation-stopping protrusion and / or a rotation-stopping recess 422 for rotation-stopping connection with the curing glue filled in the mounting groove 101. Since the curing glue is in liquid or semi-solid state during the pouring process, it has a certain fluidity. When the outer peripheral side wall of the second pipe section 420 is provided with a rotation-stopping protrusion and / or a rotation-stopping recess 422, the curing glue will flow to cover the entire outer peripheral side wall of the second pipe section 420, and adapt the rotation-stopping protrusion to form the rotation-stopping recess 422, and / or adapt the rotation-stopping recess 422 to form the rotation-stopping protrusion. After the curing glue is cured, the cooperation of the rotation-stopping protrusion and the rotation-stopping recess 422 helps to strengthen the connection strength between the tube body and the curing glue, and prevents the tube body from rotating relative to each other, resulting in looseness, noise, etc.

[0112] The tube body mentioned above is generally made of non-metallic material, which helps to avoid interference of the metal material with the magnetic field of the axial flux motor.

[0113] Furthermore, one end of the tube body extending into the mounting groove 101 extends to not exceed the setting of the stator 200. Take the stator 200 closer to the liquid cooling chamber Y and the connecting air duct X4 as an example: if the pipe mouth of the second pipe section 420 is a straight opening, that is, an opening extending roughly along the axial end surface of the stator 200, the distance between the pipe mouth of the second pipe section 420 and the rotor 300 is set to be not less than the distance between the stator 200 and the rotor 300, so as to avoid the second pipe section 420 from blocking the air gap X1 to a certain extent. If the pipe mouth of the second pipe section 420 is an inclined opening, and the pipe mouth of the second pipe mouth is inclined toward the air gap X1, the cross-sectional area of ​​the pipe mouth of the second pipe section 420 can be set to be not less than the width of the air gap X1, which also helps the hot air at the air gap X1 to flow to the axial air duct with a larger flow rate.

[0114] In view of the above, for ease of understanding, in the following embodiments, the axial air duct arranged at the radial inner side of the power module is defined as the axial inner air duct X2, the tube body forming the axial inner air duct X2 is defined as the first tube body 401, and the plug hole plugged and connected with the first tube segment 410 of the first tube body 401 is defined as the first plug hole 116a. In addition, the axial air duct arranged at the radial outer side of the power module is defined as the axial outer air duct X3, the tube body forming the axial outer air duct X3 is defined as the second tube body 402, and the plug hole plugged and connected with the first tube segment 410 of the second tube body 402 is defined as the second plug hole 116b.

[0115] Please combine Figures 5 to 8When the connecting air duct X4 defined by the convex bump 116 extends radially, a first plug hole 116a may be opened at the radial inner end of the shell 100 corresponding to the convex bump 116, and each first plug hole 116a may be corresponding to each first tube body 401 for insertion and installation; a second plug hole 116b may be opened at the radial outer end of the shell 100 corresponding to the convex bump 116, and each second plug hole 116b may be corresponding to each second tube body 402 for insertion and installation.

[0116] In view of the above, please first combine Figures 5 to 8 When the rotor 300 continues to rotate and generates hot air at the air gap X1, a pressure difference is formed due to the gradual increase in the linear velocity of the rotor 300 from its axis to its outer edge. The pressure difference can drive the hot air at the air gap X1 to gradually flow toward the axial outer air duct X3, and flow to the connecting air duct X4 through the circumferential outer air duct, and the hot air at the connecting air duct X4 is cooled by the liquid cooling chamber Y. Then the cooled gas returns to the air gap X1 through the axial inner air duct X2, thereby forming an annular air cooling flow path.

[0117] It should be noted that since the connecting air duct X4 extends radially, Figure 6 The radial inner air duct and the radial outer air duct in the same axial section shown are respectively connected to two connecting air ducts X4, and the two connecting air ducts X4 are not necessarily connected. Figure 6 What is shown is the partial flow path section of two annular air-cooled flow paths. Figure 8 What is shown is an axial cross section cut along the radial direction of one of the connecting air ducts X4. The connecting air duct X4, the axial outer air duct X3, the axial inner air duct X2 and the air gap X1 together constitute a complete annular air cooling flow path.

[0118] Except for the connection with the connecting air duct X4 and the connection with the air gap X1, each axial inner air duct X2 can be independent of each other or can be interconnected. The same applies to each axial outer air duct X3. Among them, when each axial inner air duct X2 is independent of each other, and each axial outer air duct X3 is independent of each other, each axial inner air duct X2 and each axial outer air duct X3 are arranged at intervals along the central axis of the axial flux motor. At this time, each axial inner air duct X2 and each axial outer air duct X3 can be arranged one by one in the radial direction, for example Figure 3 As shown; or each axial inner air duct X2 and each axial outer air duct X3 are arranged at a certain angle in the radial direction.

[0119] The first tube body 401 and the second tube body 402 can be respectively made of relatively standard tubes with a roughly circular cross-sectional shape. Alternatively, according to actual needs, the first tube body 401 and the second tube body 402 can be set to have other cross-sectional shapes suitable for the installation environment, such as elliptical, polygonal or suitable special shapes, so as to make full use of the environment and expand the cross-sectional area as much as possible.

[0120] In addition, it should be noted that, in view of one or more of the above embodiments, if two housings 100 are provided, and the two housings 100 are detachably connected at the notches of the two mounting grooves 101, the two mounting grooves 101 can be enclosed together to form a substantially closed space for accommodating the power module. And / or if, as described above, two rotors 300 or stators 200 are provided, and two air gaps X1 are formed:

[0121] According to actual needs, each housing 100 may adopt the above configuration. That is, each housing 100 may be provided with a liquid cooling cavity Y and / or a connecting air duct X4, so as to form a Japanese-shaped or Chinese-shaped annular air cooling flow path composed of two connecting air ducts X4, two extended axial air ducts, and one or two air gaps X1.

[0122] Alternatively, only one housing 100 adopts the above configuration. That is, only one housing 100 is provided with a liquid cooling cavity Y and a connecting air duct X4. The other housing 100 may not be provided with a liquid cooling cavity Y and a connecting air duct X4, or may be provided with a liquid cooling cavity Y or a connecting air duct X4 according to actual needs.

[0123] When two air gaps X1 are formed and the two shells 100 are respectively set as the liquid cooling chamber Y and the connecting air duct X4, the annular air cooling flow path formed by the shell 100, the stator 200 and the rotor 300 at one end and the annular air cooling flow path formed by the shell 100, the stator 200 and the rotor 300 at the other end can be connected through the axial air duct, or they can not be connected without restriction.

[0124] In addition, based on any of the above embodiments, in a further solution, the housing 100 is further provided with a first branch air duct extending from one end of the liquid cooling chamber Y facing away from the power module, and second branch air ducts are respectively opened axially on both radial sides of the liquid cooling chamber Y, and the second branch air ducts are respectively connected to the connecting air duct X4 and the first branch air duct; the liquid cooling chamber Y is respectively connected to the first branch air duct and the second branch air duct for heat exchange. It can be understood that the connecting air duct X4, the first branch air duct and the two second branch air ducts can be jointly enclosed in the periphery of the liquid cooling chamber Y, so as to fully expand the heat exchange area between the annular air cooling flow path and the liquid cooling chamber Y.

[0125] Specifically, with the help of Figures 5 and 6As shown, when the rotor 300 continues to rotate and generates hot air at the air gap X1, a pressure difference is formed due to the gradual increase in the linear velocity of the rotor 300 from its axis to its outer edge. The pressure difference can drive the hot air at the air gap X1 to gradually flow toward the axial outer air duct X3. At this time, part of the hot air flows directly into the connecting air duct X4, and the other part flows through the radially inner second branch air duct, the first branch air duct, and the radially outer second branch air duct in turn. The hot air from both parts can fully exchange heat with the liquid cooling chamber Y, and quickly cool down to obtain cold air. The cold air then converges at the downstream of the connecting air duct X4, or directly converges in the axial outer air duct X3, and returns to the air gap X1, thereby forming an annular air-cooling flow path.

[0126] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An axial flux motor, characterized in that: include: A housing formed with a mounting groove; as well as, A power module is arranged in the installation groove, the power module comprises a stator and a rotor, the rotor is arranged opposite to the stator along the axial direction and is rotatable relative to the stator, and an air gap is formed between the rotor and the stator; Wherein, the housing is formed with a liquid cooling cavity at one axial end of the power module, and the air gap and the liquid cooling cavity are located on both sides of the stator; The axial flux motor is provided with a connecting air duct and an axial air duct, the connecting air duct is close to the liquid cooling cavity, and the axial air duct communicates with the connecting air duct and the air gap.

2. The axial flux motor according to claim 1, characterized in that: At least a partial air duct section of the connecting air duct is embedded in the liquid cooling cavity along the axial direction, so that the orthographic projection of the connecting air duct in the radial direction at least partially overlaps with the orthographic projection of the liquid cooling cavity in the same radial direction.

3. The axial flux motor according to claim 2, characterized in that: The embedding depth of the connecting air duct in the liquid cooling cavity is not greater than the axial height of the liquid cooling cavity; and / or, The radial dimension of the connecting air duct is not greater than the radial dimension of the liquid cooling cavity.

4. The axial flux motor according to claim 2, characterized in that: The shell body is provided with a convex bump on one end of the liquid cooling cavity near the mounting groove, and a plurality of the convex bumps are dispersedly arranged in the liquid cooling cavity, and at least one connecting air duct is formed inside each of the convex bumps.

5. The axial flux motor according to claim 4, characterized in that: The convex hull is partially open; The axial flux motor further comprises a cover plate, a plurality of which are provided corresponding to each of the convex humps, and each of the cover plate sealing covers is provided at the opening of the corresponding convex hump.

6. The axial flux motor according to claim 1, characterized in that: The housing comprises an end cover arranged axially opposite to the stator, and a side cover extending axially from the periphery of the end cover, the end cover and the side cover jointly define the mounting groove, the end cover is provided with the liquid cooling cavity, and the end cover is provided with the connecting air duct on a side of the liquid cooling cavity close to the mounting groove; The end cover is axially penetrated with a plug hole communicating with the connecting air duct and the mounting groove; The axial flux motor further comprises a tube body, a section of which is inserted and fixed in the insertion hole, and another section of which is elongated and extends toward the air gap. The tube body defines at least a partial air duct section of the axial air duct.

7. The axial flux motor according to claim 6, characterized in that: The pipe body includes a first pipe section inserted and fixed in the insertion hole, and a second pipe section exposed outside the insertion hole; wherein, The outer peripheral side wall of the first pipe section and / or the hole wall of the insertion hole are provided with a detachable connection structure; and / or, The axial flux motor further includes glue filled between the outer peripheral side wall of the first pipe segment and the hole wall of the insertion hole; and / or, The end portion and / or the outer peripheral side wall of the second pipe section is provided with an operating structure for connecting and cooperating with an external tool; and / or, The outer peripheral side wall of the second pipe section is provided with a rotation-stopping protrusion and / or a rotation-stopping recess for rotation-stopping connection with the curing glue filled in the installation groove; and / or, The tube body is made of non-metallic material; and / or, The end of the tube body extending into the installation groove extends to not exceed the stator setting.

8. The axial flux motor according to claim 1, characterized in that: The stator comprises an iron core and a plurality of windings, wherein the iron core comprises a yoke and a plurality of teeth protruding from one axial end of the yoke, and the plurality of windings are wound around the plurality of teeth in a one-to-one correspondence; The inner wall of the winding is spaced apart from the outer peripheral side wall of the corresponding tooth portion, and the axial air duct is at least partially formed at the space.

9. The axial flux motor according to claim 1, characterized in that: The shell is also provided with a first branch air duct extending from one end of the liquid cooling cavity facing away from the power module, and second branch air ducts are respectively opened along the axial direction on both radial sides of the liquid cooling cavity, and the second branch air ducts are respectively connected to the connecting air duct and the first branch air duct; The liquid cooling chamber is connected to the first branch air duct and the second branch air duct respectively for heat exchange.

10. The axial flux motor according to any one of claims 1 to 9, characterized in that: The housing is provided with two, and the two housings are detachably connected at the notches of the two mounting slots; and / or, In the power module, two stators are provided at two axial ends of the rotor or two rotors are provided at two axial ends of the stator to form two air gaps.

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