CN118572953A - Motor and aircraft - Google Patents

Abstract

The present invention discloses a motor and an aircraft, wherein the motor comprises: a rotor assembly, wherein the rotor assembly comprises a rotor housing, wherein the rotor housing has an installation cavity; a stator bracket, wherein at least a portion of the stator bracket is arranged in the installation cavity, wherein the stator bracket has a heat dissipation duct extending along the axial direction of the rotor assembly and penetrating the stator bracket; and a stator assembly, wherein the stator assembly is arranged in the installation cavity and sleeved outside the stator bracket, wherein the stator assembly is relatively fixed to the stator bracket and relatively rotates with the rotor assembly, wherein the stator assembly comprises a stator core, wherein a heat dissipation oil channel is defined between the inner peripheral wall of the stator core and the outer peripheral wall of the stator bracket. According to the motor of the present invention, the stator assembly and the stator bracket can not only directly contact and transfer heat to remove the heat of the stator assembly, but also can transfer heat of the stator assembly through cooling oil. At the same time, the heat of the stator assembly can also be directly removed through the flow of cooling oil, thereby increasing the heat dissipation mode of the stator assembly, thereby improving the heat dissipation efficiency of the stator assembly.

Description

Motors and aircraft

Technical Field

The present invention relates to the technical field of motors, and in particular to a motor and an aircraft.

Background Art

In the prior art, heat is conducted through contact between the windings in the stator assembly and the stator core, and between the stator core and the stator bracket. The heat conduction effect is affected by the matching state of the contact surface, the thermal resistance is large, and the heat dissipation method of the stator assembly is single. Therefore, this cooling method has low heat dissipation efficiency.

Summary of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a motor, which reduces the thermal resistance between the stator support and the stator assembly, and also increases the heat dissipation mode of the stator assembly, thereby improving the heat dissipation efficiency of the stator assembly.

The present invention also provides an aircraft, comprising the above-mentioned motor.

According to an embodiment of the present invention, the motor includes: a rotor assembly, the rotor assembly includes a rotor housing, and the rotor housing has an installation cavity; a stator bracket, at least a portion of the stator bracket is arranged in the installation cavity, and the stator bracket has a heat dissipation duct extending along the axial direction of the rotor assembly and penetrating the stator bracket; a stator assembly, the stator assembly is arranged in the installation cavity and is sleeved outside the stator bracket, the stator assembly is relatively fixed to the stator bracket and relatively rotates with the rotor assembly, the stator assembly includes a stator core, and a heat dissipation oil channel is defined between the inner circumferential wall of the stator core and the outer circumferential wall of the stator bracket.

According to the motor of the embodiment of the present invention, the stator bracket has a heat dissipation duct extending along the axial direction of the rotor assembly and penetrating the stator bracket, the stator assembly is arranged in the installation cavity and sleeved outside the stator bracket, the stator assembly includes a stator core, and a heat dissipation oil channel is defined between the inner peripheral wall of the stator core and the outer peripheral wall of the stator bracket. The airflow flows in the heat dissipation duct, and the cooling oil flows in the heat dissipation oil channel, so that the heat of the stator assembly can be taken away not only by direct contact heat transfer between the stator assembly and the stator bracket, but also by heat transfer of the cooling oil, thereby reducing the thermal resistance between the stator bracket and the stator assembly. At the same time, the heat of the stator assembly can also be directly taken away by the flow of cooling oil, thereby increasing the heat dissipation method of the stator assembly, thereby improving the heat dissipation efficiency of the stator assembly.

In some embodiments of the present invention, the inner circumferential wall of the stator core has a plurality of grooves spaced apart along the circumferential direction of the stator core, the grooves extend along the axial direction of the stator core, and the inner walls of the plurality of grooves and the outer circumferential wall of the stator bracket respectively jointly form a plurality of the heat dissipation oil channels.

In some embodiments of the present invention, a plurality of stator teeth spaced apart along the circumferential direction of the stator core are provided on the outer peripheral wall of the stator core, and the plurality of grooves are respectively arranged opposite to the plurality of stator teeth along the radial direction of the stator core.

In some embodiments of the present invention, the plurality of stator teeth are arranged in one-to-one correspondence with the plurality of grooves.

In some embodiments of the present invention, the stator bracket has an oil inlet channel and a connecting hole, the oil inlet channel has an oil inlet port located on the stator bracket, and the connecting hole connects the oil inlet channel and the heat dissipation oil channel.

In some embodiments of the present invention, the outer peripheral wall of the stator support has an annular groove extending along the circumferential direction of the stator support, the connecting hole is located on the bottom wall of the annular groove, and the annular groove is connected to the plurality of heat dissipation oil channels.

In some embodiments of the present invention, the oil inlet channel extends along the axial direction of the stator bracket, the oil inlet is provided on one of the axial end faces of the stator bracket, and the connecting hole extends along the radial direction of the stator bracket.

In some embodiments of the present invention, the stator support has an oil outlet channel and an oil outlet connected to the oil outlet channel, the oil outlet channel has an inlet located on the outer peripheral wall of the stator support, and the inlet is located on one side of the axial direction of the stator core.

In some embodiments of the present invention, the oil outlet passage extends along the axial direction of the stator bracket, and the oil outlet is provided on one of the axial end surfaces of the stator bracket.

In some embodiments of the present invention, the motor further comprises: an oil injection ring, wherein the oil injection ring is provided at least at one end of the stator core in the axial direction, the oil injection ring is sleeved on the stator bracket, one end of the oil injection ring in the axial direction is abutted against the stator core, and the other end is abutted against the rotor housing or a stop portion on the outer peripheral wall of the stator bracket, an oil injection channel connected to the heat dissipation oil channel is defined between the oil injection ring and the stator bracket, an oil injection hole connected to the oil injection channel is provided on the oil injection ring, and the oil injection hole penetrates the oil injection ring in the thickness direction of the oil injection ring.

In some embodiments of the present invention, the oil injection holes are multiple and spaced apart along the circumferential direction of the oil injection ring.

In some embodiments of the present invention, the rotor assembly also includes a rotating shaft, which is disposed in the mounting cavity and connected to the rotor housing, the stator bracket is disposed outside the rotating shaft and rotates relative to the rotating shaft, and the heat dissipation duct is located radially outside the rotating shaft and is spaced apart from the rotating shaft.

In some embodiments of the present invention, the stator bracket includes: a mounting portion, which is sleeved outside the rotating shaft and rotates relative to the rotating shaft; a bracket body, which is sleeved outside the mounting portion and spaced apart from the mounting portion, and the heat dissipation duct is defined between the inner circumferential wall of the bracket body and the outer circumferential wall of the mounting portion; and a connecting portion, which is used to connect the mounting portion and the bracket body.

In some embodiments of the present invention, a bearing is provided between the stator bracket and the rotating shaft.

In some embodiments of the present invention, the rotor housing includes a first end cover, a shell body and a second end cover, the first end cover and the second end cover are respectively arranged at the two ends of the shell body in the axial direction, and are respectively connected to the two ends of the shell body in the axial direction, and the installation cavity is formed between the first end cover, the shell body and the second end cover.

In some embodiments of the present invention, an air outlet duct is provided in the first end cover, the air outlet duct is connected to the heat dissipation duct, the air outlet duct is provided with fan blades, the fan blades are fixedly connected to the first end cover, and the fan blades are used to drive the air flow from the heat dissipation duct to the air outlet duct.

In some embodiments of the present invention, the fan blades extend in a radial direction of the first end cover, and the fan blades are a plurality of blades spaced apart in a circumferential direction of the first end cover.

In some embodiments of the present invention, an oil seal is provided between the first end cover and the outer peripheral wall of the stator bracket; and/or, an oil seal is provided between the second end cover and the outer peripheral wall of the stator bracket; and/or, a bearing is provided between the second end cover and the stator bracket.

In some embodiments of the present invention, the heat dissipation duct is annular and extends along the circumferential direction of the stator bracket, and a plurality of heat dissipation ribs spaced apart along the circumferential direction of the stator bracket are provided on the outer peripheral wall of the heat dissipation duct, and the heat dissipation ribs extend along the axial direction of the stator bracket.

An aircraft according to an embodiment of the present invention includes the above-mentioned motor.

According to the aircraft of the embodiment of the present invention, by setting the above-mentioned motor, the stator bracket has a heat dissipation duct extending along the axial direction of the rotor assembly and penetrating the stator bracket, the stator assembly is arranged in the installation cavity and sleeved outside the stator bracket, the stator assembly includes a stator core, and a heat dissipation oil channel is defined between the inner peripheral wall of the stator core and the outer peripheral wall of the stator bracket. The airflow flows in the heat dissipation duct, and the cooling oil flows in the heat dissipation oil channel, so that the stator assembly and the stator bracket can not only take away the heat of the stator assembly through direct contact heat transfer, but also take away the heat of the stator assembly through heat transfer of the cooling oil, thereby reducing the thermal resistance between the stator bracket and the stator assembly. At the same time, the heat of the stator assembly can also be directly taken away by the flow of cooling oil, thereby increasing the heat dissipation method of the stator assembly, thereby improving the heat dissipation efficiency of the stator assembly.

Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and/or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

FIG1 is a cross-sectional view of a motor according to an embodiment of the present invention;

FIG2 is a perspective view of a stator bracket of a motor according to an embodiment of the present invention;

FIG3 is a perspective view of a stator bracket of a motor according to an embodiment of the present invention from another perspective;

4 is a perspective view of a stator assembly of a motor according to an embodiment of the present invention;

FIG. 5 is a front view of a stator assembly of a motor according to an embodiment of the present invention.

Reference numerals:

10. Motor;

1. rotor assembly; 11. rotor housing; 111. first end cover; 112. housing body; 113. second end cover; 114. mounting cavity; 115. air outlet duct; 12. rotating shaft;

2. stator bracket; 21. cooling air duct; 22. cooling oil channel; 23. oil inlet channel; 231. oil inlet hole; 24. annular groove; 241. connecting hole; 25. oil outlet channel; 251. oil outlet hole; 252. inlet; 26. mounting part; 27. bracket body; 28. connecting part; 29. cooling rib;

3. stator assembly; 31. stator core; 32. stator winding; 33. groove; 34. stator teeth;

4. Oil injection ring;

5. Bearings;

6. Oil seal.

DETAILED DESCRIPTION

Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

The vertical take-off motors used in existing vertical take-off and landing aircraft are mostly air-cooled, and their continuous power is relatively small. In order to improve the power density of the vertical take-off motor, the present invention provides a novel oil-air mixed cooling vertical take-off motor.

The following describes a motor 10 according to an embodiment of the present invention with reference to FIGS. 1 to 5 .

As shown in FIG. 1 to FIG. 5 , a motor 10 according to an embodiment of the present invention includes: a rotor assembly 1 , a stator support 2 and a stator assembly 3 .

Specifically, referring to Figures 1 to 3, the rotor assembly 1 includes a rotor housing 11, which has an installation cavity 114; at least a portion of the stator bracket 2 is disposed in the installation cavity 114, and the stator bracket 2 has a heat dissipation duct 21 extending along the axial direction of the rotor assembly 1 and penetrating the stator bracket 2; the stator assembly 3 is disposed in the installation cavity 114 and is sleeved on the outside of the stator bracket 2; the stator assembly 3 is relatively fixed to the stator bracket 2 and rotates relatively to the rotor assembly 1.

Among them, it should be noted that the stator assembly 3 is arranged in the installation cavity 114, the stator assembly 3 and the stator bracket 2 are fixed, and the rotor assembly 1 can rotate along the axis of the rotor assembly 1, thereby forming an outer rotor motor 10. The outer rotor motor 10 has the advantages of good heat dissipation performance, simple structure, high output power, large torque, fast response speed and strong adaptability. It has good applicability for some applications that require high performance and high efficiency, such as flying cars.

The stator assembly 3 is sleeved outside the stator bracket 2 and is interference fit with the stator bracket 2, so that the stator assembly 3 can be fixed to the stator bracket 2, thereby improving the installation stability of the stator assembly 3. At the same time, the heat transfer efficiency between the stator bracket 2 and the stator assembly 3 can also be improved, and the airflow exchanges heat with the stator bracket 2 through the heat dissipation duct 21, thereby taking away the heat generated by the stator assembly 3, so that the motor 10 can work normally.

In addition, since the stator assembly 3 is arranged in the installation cavity 114 and is sleeved on the outside of the stator bracket 2, and the heat dissipation duct 21 extends along the axial direction of the rotor assembly 1 and passes through the stator bracket 2, the stator assembly 3 is separated from the heat dissipation duct 21, thereby avoiding the airflow from contacting the stator assembly 3, and also avoiding water and dust from contacting the stator assembly 3, thereby improving the waterproof and dustproof performance of the motor 10 and increasing the service life of the motor 10.

Further, as shown in FIG. 1 , FIG. 4 and FIG. 5 , the stator assembly 3 includes a stator core 31, and a heat dissipation oil channel 22 is defined between the inner peripheral wall of the stator core 31 and the outer peripheral wall of the stator bracket 2. It can be understood that the heat generated by the stator assembly 3 during operation is taken away by the flow of cooling oil in the heat dissipation oil channel 22, thereby further improving the heat dissipation efficiency of the stator assembly 3. At the same time, the heat generated by the stator assembly 3 during operation can be transferred to the stator bracket 2 through the cooling oil through the flow of cooling oil in the heat dissipation oil channel 22, and then the heat is taken away by the flow of airflow in the heat dissipation air channel 21.

Thus, the air flows in the heat dissipation air channel 21 and the cooling oil flows in the heat dissipation oil channel 22, so that the heat of the stator assembly 3 can be taken away by direct contact heat transfer between the stator assembly 3 and the stator bracket 2, and the heat of the stator assembly 3 can be taken away by heat transfer of the cooling oil, and the heat of the stator assembly 3 can also be taken away directly by the flow of the cooling oil. Compared with the case where the heat of the stator assembly is taken away only by contact heat transfer between the stator assembly and the stator bracket, the thermal resistance between the stator bracket 2 and the stator assembly 3 is reduced, and the heat dissipation mode of the stator assembly 3 is also increased, thereby improving the heat dissipation efficiency of the stator assembly 3, thereby better ensuring the operation of the motor 10.

According to the motor 10 of the embodiment of the present invention, the stator bracket 2 has a heat dissipation duct 21 extending along the axial direction of the rotor assembly 1 and penetrating the stator bracket 2, the stator assembly 3 is arranged in the installation cavity 114 and sleeved outside the stator bracket 2, and the stator assembly 3 includes a stator core 31, and a heat dissipation oil channel 22 is defined between the inner peripheral wall of the stator core 31 and the outer peripheral wall of the stator bracket 2. The airflow flows in the heat dissipation duct 21, and the cooling oil flows in the heat dissipation oil channel 22, so that the stator assembly 3 and the stator bracket 2 can not only take away the heat of the stator assembly 3 through direct contact heat transfer, but also take away the heat of the stator assembly 3 through heat transfer of the cooling oil, thereby reducing the thermal resistance between the stator bracket 2 and the stator assembly 3. At the same time, the heat of the stator assembly 3 can also be directly taken away by the flow of cooling oil, thereby increasing the heat dissipation mode of the stator assembly 3, thereby improving the heat dissipation efficiency of the stator assembly 3.

In some embodiments of the present invention, as shown in Figures 1, 4 and 5, the inner circumferential wall of the stator core 31 has a plurality of grooves 33 spaced apart along the circumferential direction of the stator core 31, and the grooves 33 extend along the axial direction of the stator core 31. The inner walls of the plurality of grooves 33 and the outer circumferential wall of the stator bracket 2 respectively form a plurality of heat dissipation oil passages 22 together.

It can be understood that, since the stator support 2 and the stator core 31 are in an interference fit, by providing a groove 33 on the inner circumferential wall of the stator core 31, the groove 33 extends along the axial direction of the stator core 31, so that the cooling oil can flow smoothly along the axial direction of the stator core 31, thereby improving the heat dissipation efficiency. At the same time, the provision of multiple heat dissipation oil passages 22 allows the cooling oil to flow in multiple heat dissipation oil passages 22 at the same time, thereby further improving the heat transfer efficiency between the cooling oil, the stator assembly 3 and the stator support 2, thereby improving the heat dissipation efficiency. In addition, the multiple grooves 33 are spaced apart along the circumferential direction of the stator core 31, so that the multiple heat dissipation oil passages 22 are spaced apart along the circumferential direction of the stator core 31, thereby improving the heat transfer uniformity between the cooling oil, the stator assembly 3 and the stator support 2, thereby further improving the heat dissipation efficiency.

Furthermore, as shown in Figures 1, 4 and 5, the two ends of the groove 33 along the stator core 31 are open, so as to facilitate the cooling oil to flow to the two ends of the stator core 31 in the axial direction. Since the two ends of the stator core 31 in the axial direction generate more heat, the cooling oil flows to the two ends of the stator core 31 in the axial direction, thereby improving the heat dissipation effect of the two ends of the stator core 31 in the axial direction.

In some embodiments of the present invention, as shown in Figures 4 and 5, a plurality of stator teeth 34 spaced apart along the circumferential direction of the stator core 31 are provided on the outer peripheral wall of the stator core 31, and a plurality of grooves 33 are respectively arranged opposite to the plurality of stator teeth 34 along the radial direction of the stator core 31.

It can be understood that the stator teeth 34 extend in the axial direction of the stator core 31, and the stator assembly 3 further includes a stator winding 32, each of which is wound with a stator winding 32, and the stator winding 32 generates a large amount of heat when the stator assembly 3 is in operation. Therefore, the plurality of grooves 33 are respectively arranged relative to the plurality of stator teeth 34 in the radial direction of the stator core 31, so that the plurality of heat dissipation oil passages 22 are respectively arranged relative to the plurality of stator teeth 34 in the radial direction of the stator core 31, so that the cooling oil can better transfer heat with the stator winding 32, thereby improving the heat dissipation efficiency of the stator assembly 3.

In some embodiments of the present invention, as shown in FIG4 and FIG5 , a plurality of stator teeth 34 are arranged in a one-to-one correspondence with a plurality of grooves 33. Thus, a plurality of heat dissipation oil passages 22 are arranged in a one-to-one correspondence with a plurality of stator teeth 34, so that the cooling oil can better transfer heat with the stator winding 32, thereby improving the heat dissipation efficiency of the stator assembly 3.

In some embodiments of the present invention, as shown in FIGS. 1 to 3 , the stator support 2 has an oil inlet channel 23 and a connecting hole 241, the oil inlet channel 23 has an oil inlet port located on the stator support 2, and the connecting hole 241 connects the oil inlet channel 23 and the heat dissipation oil channel 22. It can be understood that the oil inlet port is connected to the oil tank, and the cooling oil can enter from the oil inlet port, flow to the connecting hole 241 through the oil inlet channel 23, and then enter the heat dissipation oil channel 22, thereby realizing the heat dissipation and heat conduction functions of the cooling oil.

In addition, the cooling oil in the oil inlet channel 23 can exchange heat with the airflow in the stator bracket 2 and the heat dissipation duct 21, thereby reducing the temperature of the cooling oil, thereby further improving the heat transfer efficiency between the stator assembly 3 and further improving the heat dissipation efficiency.

In some embodiments of the present invention, as shown in FIGS. 1 to 3 , the outer peripheral wall of the stator support 2 is provided with an annular groove 24 extending in the circumferential direction of the stator support 2, the communicating hole 241 is located on the bottom wall of the annular groove 24, and the annular groove 24 is communicated with a plurality of heat dissipation oil passages 22. It can be understood that, since the plurality of heat dissipation oil passages 22 are arranged at intervals in the circumferential direction of the stator support 2, the arrangement of the annular groove 24 allows the cooling oil to uniformly enter the plurality of heat dissipation oil passages 22 simultaneously in the circumferential direction of the stator support 2, thereby improving the heat dissipation uniformity of the stator assembly 3, and further improving the heat dissipation efficiency.

In some embodiments of the present invention, as shown in FIGS. 1 to 3 , the oil inlet channel 23 extends along the axial direction of the stator bracket 2, the oil inlet port is provided on one of the axial end faces of the stator bracket 2, and the connecting hole 241 extends along the radial direction of the stator bracket 2. It can be understood that, since the heat dissipation air duct 21 extends along the axial direction of the stator bracket 2, and the oil inlet channel 23 extends along the axial direction of the stator bracket 2, the cooling oil in the oil inlet channel 23 and the air flow in the heat dissipation air duct 21 can fully exchange heat, thereby further reducing the temperature of the cooling oil, thereby further improving the heat transfer efficiency with the stator assembly 3, and thereby further improving the heat dissipation efficiency.

In some embodiments of the present invention, as shown in Figures 1 to 3, the stator support 2 has an oil outlet channel 25 and an oil outlet connected to the oil outlet channel 25, and the oil outlet channel 25 has an inlet 252 located on the outer peripheral wall of the stator support 2, and the inlet 252 is located on one side of the axial direction of the stator core 31.

It can be understood that the inlet 252 is located on one side of the stator core 31 in the axial direction, so that the cooling oil can flow back to the inlet 252 and flow from the oil outlet channel 25 to the oil outlet. The oil outlet is connected to the oil tank, so that the cooling oil can flow back to the oil tank, thereby realizing the recycling of the cooling oil.

Further, as shown in FIGS. 1 to 3 , the stator support 2 has an oil inlet channel 23 and a connecting hole 241. The oil inlet channel 23 has an oil inlet port located on the stator support 2. The connecting hole 241 connects the oil inlet channel 23 and the heat dissipation oil channel 22. The oil inlet channel 23 and the oil outlet channel 25 are arranged relative to each other in the radial direction of the stator support 2, so that the oil inlet channel 23 and the oil outlet channel 25 are farthest apart, so that the heat exchange between the cooling oil in the oil inlet channel 23 and the cooling oil in the oil outlet channel 25 can be reduced, thereby ensuring the heat dissipation effect.

In addition, the outer peripheral wall of the stator support 2 has an annular groove 24 extending in the circumferential direction of the stator support 2, and the connecting hole 241 is located on the bottom wall of the annular groove 24, and the annular groove 24 is connected to a plurality of heat dissipation oil channels 22. Therefore, the flow path of the cooling oil in the motor 10 is:

The cooling oil flows from the oil tank into the oil inlet channel 23 through the oil inlet, then into the annular groove 24 through the connecting hole 241, and then into the plurality of heat dissipation oil channels 22 through the annular groove 24, thereby achieving heat dissipation of the stator assembly 3, and then flows to the oil outlet channel 25 through the inlet 252, and finally flows back to the oil tank from the oil outlet, thereby achieving the recycling of the cooling oil.

In some embodiments of the present invention, as shown in FIGS. 1 to 3 , the oil outlet channel 25 extends along the axial direction of the stator support 2, and the oil outlet is provided on one of the axial end faces of the stator support 2. It is understandable that, since the inlet 252 is located on one side of the axial direction of the stator core 31, and the oil outlet channel 25 extends along the axial direction of the stator support 2, it is convenient for the axis of the inlet 252 to coincide with the axis of the oil outlet channel 25, thereby facilitating the processing and formation of the oil outlet channel 25. At the same time, it is also convenient for the cooling oil to flow in the oil outlet channel 25.

Furthermore, as shown in FIGS. 1-3 , the oil outlet and the oil inlet are located on the same axial end face of the stator bracket 2 , thereby facilitating production personnel to simultaneously process the oil inlet and the oil outlet on one axial end face of the stator bracket 2 , thereby improving production and processing efficiency.

In some embodiments of the present invention, as shown in FIG1 , the motor 10 further includes: an oil injection ring 4, at least one end of the stator core 31 in the axial direction is provided with the oil injection ring 4, the oil injection ring 4 is sleeved on the stator bracket 2, one end of the oil injection ring 4 in the axial direction abuts against the stator core 31, and the other end abuts against the abutment portion on the outer peripheral wall of the rotor housing 11 or the stator bracket 2. Thus, the oil injection ring 4 can be fixed in the installation cavity 114, thereby improving the installation stability of the oil injection ring 4.

Among them, in the present invention, both ends of the stator core 31 in the axial direction are provided with an oil injection ring 4, one end of the oil injection ring 4 in the axial direction is abutted against the stator core 31, and the other end is abutted against the rotor housing 11; however, the present invention is not limited to this, and an oil injection ring 4 can also be provided at one end of the stator core 31 in the axial direction, and at the same time, one end of the oil injection ring 4 in the axial direction can be abutted against the stator core 31, and the other end can be abutted against the abutment portion on the outer peripheral wall of the stator bracket 2.

Further, as shown in FIG1 , an oil injection channel connected to the heat dissipation oil channel 22 is defined between the oil injection ring 4 and the stator bracket 2 , and an oil injection hole connected to the oil injection channel is provided on the oil injection ring 4 , and the oil injection hole penetrates the oil injection ring 4 in the thickness direction of the oil injection ring 4 .

It can be understood that the cooling oil flows from the heat dissipation oil channel 22 to the oil injection channel, and then flows from the oil injection hole to at least one end of the stator core 31 in the axial direction, and the two ends of the stator core 31 in the axial direction are areas with more severe heat generation. Therefore, it is possible to directly spray cooling oil on at least one end of the stator core 31 in the axial direction to cool and dissipate heat, thereby achieving focused cooling and dissipation of the area with more severe heat generation in the stator core 31, thereby improving the heat dissipation efficiency.

In some embodiments of the present invention, the oil injection holes are multiple and spaced apart along the circumferential direction of the oil injection ring 4. Thus, the cooling oil can be uniformly sprayed onto the stator core 31 along the circumferential direction of the stator core 31, thereby improving the uniformity of heat dissipation and further improving the heat dissipation efficiency.

In some embodiments of the present invention, as shown in Figures 1-3, the rotor assembly 1 also includes a rotating shaft 12, which is disposed in the installation cavity 114 and connected to the rotor housing 11, the stator bracket 2 is sleeved outside the rotating shaft 12 and rotates relative to the rotating shaft 12, and the heat dissipation duct 21 is located radially outside the rotating shaft 12 and is spaced apart from the rotating shaft 12.

It is understandable that the rotating shaft 12 can drive the rotor housing 11 to rotate, thereby realizing the rotation of the rotor assembly 1, thereby realizing the normal operation and outward output torque of the motor 10. The heat dissipation duct 21 is located radially outside the rotating shaft 12 and is spaced from the rotating shaft 12, thereby avoiding installation interference of the rotating shaft 12 and avoiding the rotating shaft 12 from blocking the heat dissipation duct 21, ensuring that the airflow can pass through the heat dissipation duct 21, thereby ensuring the heat dissipation effect.

In some embodiments of the present invention, as shown in FIGS. 1 to 3 , the stator bracket 2 includes: a mounting portion 26, a bracket body 27, and a connecting portion 28. The mounting portion 26 is sleeved outside the rotating shaft 12 and rotates relative to the rotating shaft 12; the bracket body 27 is sleeved outside the mounting portion 26 and is spaced apart from the mounting portion 26, and a heat dissipation duct 21 is defined between the inner peripheral wall of the bracket body 27 and the outer peripheral wall of the mounting portion 26.

It is understandable that the mounting portion 26 is sleeved outside the rotating shaft 12 and rotates relative to the rotating shaft 12, which can limit the movement of the rotating shaft 12 along the radial direction of the mounting portion 26, thereby improving the installation stability of the rotating shaft 12, and can also avoid interfering with the rotation of the rotating shaft 12, thereby ensuring the stable operation of the rotating shaft 12. The inner peripheral wall of the bracket body 27 and the outer peripheral wall of the mounting portion 26 define a heat dissipation duct 21, thereby ensuring that the airflow passes smoothly through the heat dissipation duct 21, thereby ensuring the heat dissipation effect.

Further, as shown in Fig. 2, the connection portion 28 is used to connect the mounting portion 26 and the bracket body 27. The connection portion 28 extends in the radial direction of the mounting portion 26. One end of the connection portion 28 is connected to the outer peripheral wall of the mounting portion 26, and the other end is connected to the inner peripheral wall of the bracket body 27. Thus, the connection reliability of the mounting portion 26 and the bracket body 27 is improved, so that the mounting portion 26 and the bracket body 27 can be formed as a whole, thereby improving the overall structural strength of the stator bracket 2.

In some embodiments of the present invention, as shown in FIG1 , a bearing 5 is provided between the stator bracket 2 and the rotating shaft 12. The bearing 5 is sleeved on the rotating shaft 12, thereby realizing a rotatable connection between the stator bracket 2 and the rotating shaft 12, that is, when the rotating shaft 12 rotates, the stator bracket 2 is fixed, and relative movement between the stator bracket 2 and the rotating shaft 12 can be avoided, so that the rotating shaft 12 is stably installed, thereby realizing normal operation of the motor 10.

Further, as shown in Fig. 1, the bearings 5 are multiple and spaced apart along the axis direction of the rotating shaft 12, so as to further stabilize the installation of the rotating shaft 12 and stably and reliably rotate the rotating shaft 12. For example, in the example shown in Fig. 1, there are two bearings 5, but the present invention is not limited thereto, and there may be more bearings 5, such as 3, 4, 5 or 6.

In addition, the stator bracket 2 includes a mounting portion 26 . The mounting portion 26 is sleeved outside the rotating shaft 12 and rotates relative to the rotating shaft 12 . The bearing 5 is disposed between the mounting portion 26 and the rotating shaft 12 .

In some embodiments of the present invention, as shown in FIG1 , the rotor housing 11 includes a first end cover 111, a shell body 112, and a second end cover 113. The first end cover 111 and the second end cover 113 are respectively disposed at two ends of the shell body 112 in the axial direction, and are respectively connected to two ends of the shell body 112 in the axial direction. A mounting cavity 114 is formed between the first end cover 111, the shell body 112, and the second end cover 113. It should be noted that the first end cover 111 and the second end cover 113 are respectively connected to two ends of the shell body 112 in the axial direction by fasteners such as screws, thereby improving the connection reliability between the first end cover 111 and the second end cover 113 and the two ends of the shell body 112 in the axial direction.

It can be understood that the rotor housing 11 is formed by connecting the first end cover 111, the shell body 112 and the second end cover 113, so that it is easy to disassemble and repair the stator assembly 3 in the installation cavity 114, making installation and maintenance convenient. Among them, at least part of one end of the second end cover 113 is open, so that the end of the stator bracket 2 away from the first end cover 111 is convenient for connecting the oil tank and the air inlet.

In some embodiments of the present invention, as shown in Figure 1, an air outlet duct 115 is provided in the first end cover 111, and the air outlet duct 115 is connected to the heat dissipation duct 21. Fan blades (not shown in the figure) are provided in the air outlet duct 115, and the fan blades are fixedly connected to the first end cover 111. The fan blades are used to drive the air flow from the heat dissipation duct 21 to the air outlet duct 115.

It can be understood that the fan blades are fixedly connected to the first end cover 111, and the rotor assembly 1 can rotate along the axis of the rotor assembly 1, that is, the rotor housing 11 can rotate along the axis of the rotor housing 11, that is, the first end cover 111 can rotate along the axis of the first end cover 111. Therefore, the rotation of the first end cover 111 drives the rotation of the fan blades, thereby driving the airflow to enter from the heat dissipation duct 21 and then flow out from the air outlet duct 115, thereby improving the efficiency of the airflow flow, thereby further improving the heat dissipation efficiency.

At the same time, since the rotation of the fan blades can be achieved by rotating the first end cover 111, there is no need to set up an additional driving mechanism, which simplifies the structure and saves energy input.

In some embodiments of the present invention, the fan blades extend in the radial direction of the first end cover 111, and the fan blades are multiple and spaced apart in the circumferential direction of the first end cover 111. Thus, the multiple fan blades can jointly drive the flow of airflow, thereby further improving the efficiency of the airflow, thereby further improving the heat dissipation efficiency.

In some embodiments of the present invention, as shown in FIG. 1 , an oil seal 6 is provided between the first end cover 111 and the outer peripheral wall of the stator bracket 2; thereby, leakage of cooling oil from the first end cover 111 can be avoided, and contact between liquid and air and the stator assembly 3 can also be avoided, thereby improving the sealing performance and increasing the service life of the motor 10.

In some embodiments of the present invention, as shown in FIG. 1 , an oil seal 6 is provided between the second end cover 113 and the outer peripheral wall of the stator bracket 2; thereby, leakage of cooling oil from the second end cover 113 can be avoided, and contact between liquid and air and the stator assembly 3 can also be avoided, thereby improving the sealing performance and increasing the service life of the motor 10.

In some embodiments of the present invention, as shown in FIG1 , a bearing 5 is provided between the second end cover 113 and the stator bracket 2. Thus, the rotor housing 11 can be prevented from driving the stator bracket 2 to rotate when rotating, thereby achieving relative rotation between the rotor assembly 1 and the stator bracket 2, thereby ensuring the normal operation of the motor 10.

In some embodiments of the present invention, as shown in FIGS. 1 to 3 , the heat dissipation duct 21 is annular and extends in the circumferential direction of the stator bracket 2. A plurality of heat dissipation ribs 29 spaced apart in the circumferential direction of the stator bracket 2 are provided on the outer peripheral wall of the heat dissipation duct 21, and the heat dissipation ribs 29 extend in the axial direction of the stator bracket 2. It is understandable that the heat dissipation ribs 29 are provided in the heat dissipation duct 21, so that the contact area between the airflow and the stator bracket 2 can be increased, thereby further improving the heat dissipation efficiency.

The following describes an aircraft according to an embodiment of the present invention.

The aircraft according to the embodiment of the present invention includes the above-mentioned motor 10.

According to the aircraft of the embodiment of the present invention, by setting the above-mentioned motor 10, the stator bracket 2 has a heat dissipation duct 21 extending along the axial direction of the rotor assembly 1 and penetrating the stator bracket 2, the stator assembly 3 is arranged in the installation cavity 114 and sleeved outside the stator bracket 2, and the stator assembly 3 includes a stator core 31, and a heat dissipation oil channel 22 is defined between the inner peripheral wall of the stator core 31 and the outer peripheral wall of the stator bracket 2. The airflow flows in the heat dissipation duct 21, and the cooling oil flows in the heat dissipation oil channel 22, so that the stator assembly 3 and the stator bracket 2 can not only take away the heat of the stator assembly 3 through direct contact heat transfer, but also take away the heat of the stator assembly 3 through heat transfer of the cooling oil, thereby reducing the thermal resistance between the stator bracket 2 and the stator assembly 3. At the same time, the heat of the stator assembly 3 can also be directly taken away by the flow of cooling oil, thereby increasing the heat dissipation mode of the stator assembly 3, thereby improving the heat dissipation efficiency of the stator assembly 3.

In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims (20)

1. A motor, comprising: A rotor assembly, the rotor assembly comprising a rotor housing, wherein the rotor housing has a mounting cavity; A stator bracket, at least a portion of which is disposed in the mounting cavity, and the stator bracket has a heat dissipation duct extending along the axial direction of the rotor assembly and penetrating the stator bracket; A stator assembly is arranged in the installation cavity and sleeved outside the stator bracket. The stator assembly is relatively fixed to the stator bracket and relatively rotates with the rotor assembly. The stator assembly includes a stator core. A heat dissipation oil channel is defined between the inner circumferential wall of the stator core and the outer circumferential wall of the stator bracket. 2. The motor according to claim 1 is characterized in that the inner circumferential wall of the stator core has a plurality of grooves spaced apart along the circumferential direction of the stator core, the grooves extend along the axial direction of the stator core, and the inner walls of the plurality of grooves and the outer circumferential wall of the stator bracket respectively jointly form a plurality of the heat dissipation oil channels. 3. The motor according to claim 2 is characterized in that a plurality of stator teeth spaced apart along the circumferential direction of the stator core are provided on the outer peripheral wall of the stator core, and the plurality of grooves are respectively arranged opposite to the plurality of stator teeth along the radial direction of the stator core. 4 . The motor according to claim 3 , wherein the plurality of stator teeth and the plurality of grooves are arranged in one-to-one correspondence. 5. The motor according to claim 2 is characterized in that the stator bracket has an oil inlet channel and a connecting hole, the oil inlet channel has an oil inlet port located on the stator bracket, and the connecting hole connects the oil inlet channel and the heat dissipation oil channel. 6. The motor according to claim 5 is characterized in that an annular groove extending along the circumferential direction of the stator bracket is provided on the outer peripheral wall of the stator bracket, the connecting hole is located on the bottom wall of the annular groove, and the annular groove is connected to the plurality of heat dissipation oil passages. 7. The motor according to claim 5 is characterized in that the oil inlet channel extends along the axial direction of the stator bracket, the oil inlet is arranged on one of the axial end faces of the stator bracket, and the connecting hole extends along the radial direction of the stator bracket. 8. The motor according to claim 1 is characterized in that the stator bracket has an oil outlet channel and an oil outlet connected to the oil outlet channel, the oil outlet channel has an inlet located on the outer peripheral wall of the stator bracket, and the inlet is located on one side of the axial direction of the stator core. 9 . The motor according to claim 8 , wherein the oil outlet passage extends along the axial direction of the stator bracket, and the oil outlet is arranged on one of the axial end faces of the stator bracket. 10. The motor according to claim 1, further comprising: An oil injection ring is provided at least at one end of the stator core in the axial direction, and the oil injection ring is sleeved on the stator bracket. One end of the oil injection ring in the axial direction abuts against the stator core, and the other end abuts against the rotor housing or a stop portion on the outer peripheral wall of the stator bracket. An oil injection channel connected to the heat dissipation oil channel is defined between the oil injection ring and the stator bracket. An oil injection hole connected to the oil injection channel is provided on the oil injection ring, and the oil injection hole penetrates the oil injection ring in the thickness direction of the oil injection ring. 11 . The motor according to claim 10 , wherein the oil injection holes are multiple and spaced apart along the circumferential direction of the oil injection ring. 12. The motor according to claim 1 is characterized in that the rotor assembly also includes a rotating shaft, the rotating shaft is arranged in the installation cavity and connected to the rotor housing, the stator bracket is sleeved outside the rotating shaft and rotates relative to the rotating shaft, and the heat dissipation duct is located radially outside the rotating shaft and is spaced apart from the rotating shaft. 13. The motor according to claim 12, characterized in that the stator bracket comprises: A mounting portion, the mounting portion is sleeved outside the rotating shaft and rotates relative to the rotating shaft; A bracket body, wherein the bracket body is sleeved outside the mounting portion and spaced apart from the mounting portion, and the heat dissipation duct is defined between the inner peripheral wall of the bracket body and the outer peripheral wall of the mounting portion; A connecting portion, wherein the connecting portion is used to connect the mounting portion and the bracket body. 14. The motor according to claim 12, characterized in that a bearing is provided between the stator bracket and the rotating shaft. 15. The motor according to claim 1 is characterized in that the rotor housing includes a first end cover, a shell body and a second end cover, the first end cover and the second end cover are respectively arranged at the two ends of the shell body in the axial direction, and are respectively connected to the two ends of the shell body in the axial direction, and the installation cavity is formed between the first end cover, the shell body and the second end cover. 16. The motor according to claim 15 is characterized in that an air outlet duct is provided in the first end cover, the air outlet duct is communicated with the heat dissipation duct, the air outlet duct is provided with fan blades, the fan blades are fixedly connected to the first end cover, and the fan blades are used to drive the air flow from the heat dissipation duct to the air outlet duct. 17 . The motor according to claim 16 , wherein the fan blades extend in a radial direction of the first end cover, and the fan blades are a plurality of blades spaced apart in a circumferential direction of the first end cover. 18. The motor according to claim 15, characterized in that an oil seal is provided between the first end cover and the outer peripheral wall of the stator bracket; And/or, an oil seal is provided between the second end cover and the outer peripheral wall of the stator support; And/or, a bearing is provided between the second end cover and the stator bracket. 19. The motor according to claim 1 is characterized in that the heat dissipation duct is annular and extends along the circumferential direction of the stator bracket, and a plurality of heat dissipation ribs spaced apart along the circumferential direction of the stator bracket are provided on the outer peripheral wall of the heat dissipation duct, and the heat dissipation ribs extend along the axial direction of the stator bracket. 20. An aircraft, characterized by comprising the electric motor according to any one of claims 1-19.