Outer rotor motor with composite cooling structure for hovercar

Abstract

The utility model discloses an outer rotor motor with a composite cooling structure for an aerocar. The outer rotor motor comprises an upper end cover, a rotor shell and a stator bracket provided with an oil cooling structure and an air cooling structure, the upper end cover is fixedly connected with the rotor shell, the upper end and the lower end of a rotating shaft fixedly connected with the upper end cover are rotationally connected with the stator support through first bearings, the bottom of the stator support is rotationally connected with the rotor shell through second bearings, the stator support is fixedly connected with the stator iron core, and the winding is wound in a tooth groove of the stator iron core. The inner wall of the rotor shell is fixedly connected with a permanent magnet; the outer rotor motor is subjected to heat dissipation through combination of an oil cooling structure and an air cooling structure. According to the utility model, an oil-cooling and air-cooling composite cooling structure is adopted, oil is utilized to carry out spray cooling on the iron core and the winding, and air formed by the paddles is utilized to cool the oil subjected to heat exchange in the stator bracket, so that the structural compactness is enhanced, and the weight and the volume of the motor are further reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to outer rotor motor technical field, concretely relates to a compound cooling structure's outer rotor motor for flying car. BACKGROUND

[0002] In recent years, due to the influence of bad weather, mountain landslide phenomenon often occurs, so that the masses in mountainous and plateau areas are affected by this, and ordinary rescue vehicles are difficult to play a rescue role in such places, and the electric flying car as a new type of traffic tool that can take off and land at any time and has smaller space requirement can solve this rescue problem.

[0003] The electric flying car drives the propeller to rotate at high speed through the motor, generates enough lift and can quickly vertically climb, which requires the motor to output high power for a short time, and the outer rotor motor has the characteristics of high torque density and high power density, and is therefore more used in the field of aircraft, and the heat dissipation problem is a key factor affecting the high power output of the outer rotor motor, and since the flying car has higher requirements for light weight, the volume of the motor is usually designed to be small, and the heat dissipation performance is poor, in addition, considering the characteristics of the outer rotor motor structure, the stator core is inside, so that the motor main heat source-iron core winding generates a large amount of heat, which accumulates in the motor, if the heat cannot be taken away from the motor in time, the motor will overheat, and in severe cases, the permanent magnet will demagnetize, affecting the power performance of the motor, and further affecting the safety of the flying car. Therefore, the application proposes an outer rotor motor with a compound cooling structure adopting air cooling and oil cooling. SUMMARY

[0004] The utility model discloses a kind of outer rotor motors of compound cooling structure for flying car, and the stator support with air cooling structure and oil cooling structure is set to solve the problem proposed in above background technology.

[0005] To achieve the above object, the utility model provides the following technical scheme:

[0006] An outer rotor motor of compound cooling structure for flying car, comprising an upper end cover, a rotor shell, and a stator support provided with an oil cooling structure and an air cooling structure;The upper end cover is fixedly connected with the rotor shell, and the upper and lower ends of the rotating shaft fixedly connected with the upper end cover are rotatably connected with the stator support through first bearings, and the bottom of the stator support is rotatably connected with the rotor shell through second bearings;The stator support is fixedly connected with a stator core, and a winding is wound in the tooth slot of the stator core;The inner wall of the rotor shell is fixedly connected with a permanent magnet;The outer rotor motor is cooled by the combination of the oil cooling structure and the air cooling structure.

[0007] Further, the stator support is a columnar structure, which is divided into an inner layer, a middle hollow layer and an outer layer, the inner layer is hollow, the rotating shaft extends into the inner layer and is connected to the inner layer; the middle hollow layer surrounds the inner layer, the inside of the middle hollow layer is hollow from top to bottom, forming a plurality of fan-shaped air outlets; the outer layer is a wall body of the stator support, the inside of the wall body is provided with an oil channel cavity, the outer circumferential surface of the wall body is provided with an oil injection port at the top, and the outer circumferential surface of the wall body extends outward at the bottom to form an oil collecting groove.

[0008] Further, the stator support is a columnar structure, which is divided into an inner layer, a middle hollow layer and an outer layer, the inner layer is hollow, the rotating shaft extends into the inner layer and is connected to the inner layer; the middle hollow layer surrounds the inner layer, the inside of the middle hollow layer is hollow from top to bottom, forming a plurality of fan-shaped air outlets; the outer layer is a wall body of the stator support, the inside of the wall body is provided with an oil channel cavity, the outer circumferential surface of the wall body is provided with an oil injection port at the top, and the outer circumferential surface of the wall body extends outward at the bottom to form an oil collecting groove.

[0009] Further, the stator support is a columnar structure, which is divided into an inner layer, a middle hollow layer and an outer layer, the inner layer is hollow, the rotating shaft extends into the inner layer and is connected to the inner layer; the middle hollow layer surrounds the inner layer, the inside of the middle hollow layer is hollow from top to bottom, forming a plurality of fan-shaped air outlets; the outer layer is a wall body of the stator support, the inside of the wall body is provided with an oil channel cavity, the outer circumferential surface of the wall body is provided with an oil injection port at the top, and the outer circumferential surface of the wall body extends outward at the bottom to form an oil collecting groove.

[0010] Further, the stator support is a columnar structure, which is divided into an inner layer, a middle hollow layer and an outer layer, the inner layer is hollow, the rotating shaft extends into the inner layer and is connected to the inner layer; the middle hollow layer surrounds the inner layer, the inside of the middle hollow layer is hollow from top to bottom, forming a plurality of fan-shaped air outlets; the outer layer is a wall body of the stator support, the inside of the wall body is provided with an oil channel cavity, the outer circumferential surface of the wall body is provided with an oil injection port at the top, and the outer circumferential surface of the wall body extends outward at the bottom to form an oil collecting groove.

[0011] Further, the stator support is a columnar structure, which is divided into an inner layer, a middle hollow layer and an outer layer, the inner layer is hollow, the rotating shaft extends into the inner layer and is connected to the inner layer; the middle hollow layer surrounds the inner layer, the inside of the middle hollow layer is hollow from top to bottom, forming a plurality of fan-shaped air outlets; the outer layer is a wall body of the stator support, the inside of the wall body is provided with an oil channel cavity, the outer circumferential surface of the wall body is provided with an oil injection port at the top, and the outer circumferential surface of the wall body extends outward at the bottom to form an oil collecting groove.

[0012] Further, the stator support is a columnar structure, which is divided into an inner layer, a middle hollow layer and an outer layer, the inner layer is hollow, the rotating shaft extends into the inner layer and is connected to the inner layer; the middle hollow layer surrounds the inner layer, the inside of the middle hollow layer is hollow from top to bottom, forming a plurality of fan-shaped air outlets; the outer layer is a wall body of the stator support, the inside of the wall body is provided with an oil channel cavity, the outer circumferential surface of the wall body is provided with an oil injection port at the top, and the outer circumferential surface of the wall body extends outward at the bottom to form an oil collecting groove.

[0013] Further, the stator support is a columnar structure, which is divided into an inner layer, a middle hollow layer and an outer layer, the inner layer is hollow, the rotating shaft extends into the inner layer and is connected to the inner layer; the middle hollow layer surrounds the inner layer, the inside of the middle hollow layer is hollow from top to bottom, forming a plurality of fan-shaped air outlets; the outer layer is a wall body of the stator support, the inside of the wall body is provided with an oil channel cavity, the outer circumferential surface of the wall body is provided with an oil injection port at the top, and the outer circumferential surface of the wall body extends outward at the bottom to form an oil collecting groove.

[0014] As a preferred scheme, the upper end cover is provided with a side air outlet, and the side air outlet is arranged on the side wall of the upper end cover.

[0015] As a preferred scheme, the oil collecting groove is in contact with the rotor shell through a sealing ring.

[0016] Compared with the prior art, the utility model has the advantages of:

[0017] The utility model discloses a stator support with air cooling structure and oil cooling structure, adopts oil cooling and air cooling composite cooling structure, utilizes oil to spray cooling to the iron core and winding, utilizes the air formed by the paddle to cool the oil that passes heat exchange in the stator support, also completes the cooling circulation of the motor inside, need not place radiator separately, improves the structure utilization rate, strengthens the compactness of structure, further reduces the motor weight and size, satisfies the requirement of light weight design, in addition, the stator support of air cooling structure and oil cooling structure proposed in the utility model can be designed on the basis of the original motor structure, need not add other structure, compared with the prior art cooling scheme, under the condition of improving the same cooling efficiency, the motor weight and size added by the utility model will be much smaller. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is whole structure schematic diagram of the utility model;

[0019] Figure 2 It is whole structure explosion drawing of the utility model;

[0020] Figure 3 It is internal section view of whole structure of the utility model;

[0021] Figure 4 It is upper half structure schematic diagram of the utility model stator support;

[0022] Figure 5 It is lower half structure schematic diagram of the utility model stator support;

[0023] Figure 6 It is outer oil channel cavity structure schematic diagram of the utility model stator support;

[0024] Figure 7 It is oil cooling route schematic diagram of the utility model;

[0025] Figure 8 It is air cooling route schematic diagram of the utility model;

[0026] In the drawing: 1, upper end cover;2, rotor shell;3, winding;4, stator core;5, permanent magnet;6, stator support;6-1, oil inlet;6-2, oil outlet;6-3, oil collecting groove;6-4, heat dissipation fin;6-5, inner layer;6-6, middle hollow layer;6-7, outer layer;7, rotating shaft;8, first bearing;9, oil pump;10, oil inlet;11, oil outlet;12, oil injection port;13, fan-shaped air inlet;14, fan-shaped air outlet;15, second bearing;16, side air outlet hole. DETAILED DESCRIPTION

[0027] The utility model will be described further in detail in combination with examples and drawings, but the implementation of the utility model is not limited to this.

[0028] Please refer to Figures 1-8 The embodiment provides a technical scheme:

[0029] A composite cooling structure's outer rotor motor for flying car, including upper end cover 1, rotor shell 2, and the stator support 6 that is equipped with oil cooling structure and air cooling structure;The upper end cover 1 is fixedly connected with the rotor shell 2, and the rotating shaft 7 fixedly connected with the upper end cover 1 is rotatably connected with the stator support 6 through the first bearing 8, the bottom of the stator support 6 is rotatably connected with the rotor shell 2 through the second bearing 15, the stator support 6 is fixedly connected with the stator core 4, and the winding 3 is wound in the tooth slot of the stator core 4, and the inner wall of the rotor shell 2 is fixedly connected with the permanent magnet;The outer rotor motor is cooled by the combination of oil cooling structure and air cooling structure.

[0030] The embodiment sets the stator support 6 with air cooling structure and oil cooling structure, adopts oil cooling and air cooling composite cooling structure, sprays the oil to the core and winding 3 for cooling, cools the oil in the stator support 6 by the wind formed by the paddle, and also completes the cooling circulation in the motor, without needing to additionally arrange a radiator, improves the structure utilization rate, enhances the structure compactness, further reduces the motor weight and volume, and meets the requirement of lightweight design;In addition, the stator support 6 with air cooling structure and oil cooling structure can be designed on the basis of the original motor structure, without needing to add other structures, compared with the existing cooling scheme, the motor weight and volume increased by the utility model will be much smaller under the condition of improving the same cooling efficiency.

[0031] The power generation principle of the embodiment is as follows: when the winding 3 coil is connected with current, a rotating magnetic field is generated, the permanent magnet 5 in the inner wall of the rotor shell 2 receives the rotating magnetic field and generates interaction force with the winding 3, since the stator core 4 wound with the winding 3 is fixed, the permanent magnet 5 is forced to rotate, then the rotor shell 2 fixedly connected with the permanent magnet 5 also rotates, and further drives the upper end cover 1 screw-connected with the rotor shell 2 to rotate, only the paddle is fixed on the upper end cover 1, and power output can be completed.

[0032] The specific structure of the stator support 6 with oil cooling structure and air cooling structure in the embodiment is as follows, as shown in Figures 4 to 6As shown: The stator support 6 is a columnar structure, divided into an inner layer 6-5, a middle hollow layer 6-6, and an outer layer 6-7. The inner layer 6-5 is hollow, through which the rotating shaft 7 extends and connects. The middle hollow layer 6-6 surrounds the inner layer 6-5, with hollow sections at the top and bottom forming several fan-shaped air outlets 14. The outer layer 6-7 is the wall of the stator support 6, with an oil channel cavity inside. An oil spray nozzle 12 is arranged around the top of the outer periphery, and an oil collection groove 6-3 extends outward from the bottom of the outer periphery. To ensure structural stability, the upper end of the rotating shaft 7 is fixedly connected to the upper end cover 1 via a coupling flange. When the upper end cover 1 rotates, the rotating shaft 7 rotates synchronously under the action of the coupling flange. The rotating shaft 7 and the stator support 6 are rotatably connected via two inner bearings (i.e., the first bearing 8). At the same time, a shoulder is provided inside the stator support 6, which limits the first bearing 8 and fixes the rotating shaft 7, so that the rotating shaft 7 supports the motor rotor. The rotor housing 2 is rotatably connected to the stator support 6 via the second bearing 15. In this embodiment, the outer layer 6-7 of the stator support 6 is set as a thin-walled oil passage cavity, which can directly eliminate the complex oil passage pipes used in the existing oil cooling structure and meet the requirements of lightweight design.

[0033] In this embodiment, as Figure 2 or Figure 3 As shown, an oil pump 9 is provided at the bottom of the inner layer 6-5 of the stator support 6. The oil inlet and outlet of the oil pump 9 are connected to the oil passage cavity of the outer layer 6-7 of the stator support 6 through the oil inlet channel 6-1 and the oil outlet channel 6-2. In this embodiment, the oil inlet channel 6-1 and the oil outlet channel 6-2 extend from the inside to the outside of the inner layer 6-5 of the stator support 6, pass through the middle hollow layer 6-6, and then connect to the oil passage cavity of the outer layer 6-7 of the stator support 6. The purpose is that when the oil passes through the middle hollow layer 6-6 in the oil outlet channel 6-2, some of the heat is transferred to the heat dissipation fins 6-4.

[0034] In this embodiment, as Figure 4 As shown, the stator support 6 has a hollowed-out layer 6-6 with heat dissipation fins 6-4. These fins are connected to the inner wall of the outer layer 6-7 and extend towards the inner layer 6-5 without contact. In this embodiment, the heat dissipation fins 6-4 are positioned between the inner layer 6-5 and the outer layer 6-7 of the stator support 6, directly contacting the outer layer 6-7 but not the inner layer 6-5. Since the outer layer 6-7 is an internal oil channel cavity, the oil flows from bottom to top within the cavity, allowing heat to be directly transferred to the heat dissipation fins 6-4. Under the air-cooling structure, the accumulated heat on the heat dissipation fins 6-4 is carried away. Furthermore, the extension of the heat dissipation fins 6-4 towards the inner layer 6-5 without contact serves two purposes: first, to prevent heat transfer to the inner layer 6-5 of the stator support 6; and second, to enhance airflow.

[0035] The oil-cooled structure and its heat exchange process in this embodiment are as follows: Figure 7 As shown,Figure 7 The oil flow route map in the oil cooling structure is as follows: the oil cooling structure comprises an oil inlet 10, an oil inlet channel 6-1, an oil injection port 12, an oil outlet channel 6-2, an oil outlet 11, an oil channel cavity of the outer layer 6-7 of the stator support 6, and an oil collecting groove 6-3. The oil is pumped into the oil inlet 10 by the oil pump 9, enters the oil channel cavity of the outer layer 6-7 of the stator support 6 through the oil inlet channel 6-1, gradually flows from the bottom end to the top end of the cavity, and is sprayed from the oil injection port 12 to the stator core 4 and the winding 3, thereby completing the contact heat exchange. The oil completing the contact heat exchange drops on the oil collecting groove 6-3 and is pumped back into the oil pump 9 under the influence of the pressure difference of the oil pump 9, thereby completing the oil circulation.

[0036] The air cooling structure and the heat exchange process thereof in the embodiment are as follows, as shown in Figure 8 , and Figure 8 The air flow route map in the air cooling structure is as follows: the air cooling structure comprises a fan-shaped air inlet 13 of the middle hollow layer 6-6 of the stator support 6, heat dissipation fins 6-4, and a fan-shaped air outlet 14. The blades fixed to the upper end cover 1 generate lift under the rotation of the upper end cover 1, the air generated by the rotation of the blades blows downward, and the rotation of the upper end cover 1 forms a pressure difference, thereby sucking the air from the fan-shaped air inlet 13 at the bottom of the middle hollow layer 6-6 into the motor, passing through the area where the heat dissipation fins 6-4 are located, and then discharging the air from the fan-shaped air outlet 14 at the top of the middle hollow layer 6-6, and discharging the heat from the side air outlet hole 16 of the upper end cover 1, thereby completing the air cooling heat dissipation.

[0037] In the embodiment, the heat dissipation fins 6-4 of the middle hollow layer 6-6 not only absorb the heat generated by the operation of the outer rotor motor, but also absorb the heat of the oil completing the heat exchange of the oil cooling structure. The air cooling structure of the embodiment not only cools and dissipates heat from the motor, but also cools the oil of the oil cooling structure, so that the two are functionally related. Compared with the existing oil cooling structure, the embodiment does not need to additionally arrange a radiator, thereby greatly improving the utilization rate and compactness of the structure.

[0038] To ensure that the heat in the embodiment is smoothly discharged, as shown in Figure 1 or Figure 3 The upper end cover 1 is provided with a side air outlet hole 16, and the side air outlet hole 16 is arranged around the side wall of the upper end cover 1. The side air outlet hole 16 arranged around the side wall of the upper end cover 1 in the embodiment generates centrifugal force when the upper end cover 1 rotates, so that the air moves along the path of the side air outlet hole 16 at a high speed and is then discharged from the side air outlet hole 16. The design of the centrifugal fan type of the upper end cover 1 further improves the heat dissipation efficiency of the embodiment.

[0039] To further ensure the sealing property of the embodiment, the oil collecting groove 6-3 and the rotor shell 2 are in contact through a sealing ring, thereby preventing oil leakage.

[0040] The above is the preferred embodiment of the present application, but the embodiment of the present application is not limited by the above, any change, modification, replacement, combination, simplification made without departing from the spirit and principles of the present application should be an equivalent replacement method, and all are included in the protection scope of the present application.

Claims

1. A hybrid cooling structure for an outer rotor electric machine for an air car, characterized by, The application relates to an outer rotor motor, which comprises an upper end cover, a rotor shell and a stator support provided with oil cooling structure and air cooling structure; the upper end cover is fixedly connected with the rotor shell; the upper and lower ends of a rotating shaft fixedly connected with the upper end cover are rotatably connected with the stator support through first bearings; the bottom of the stator support is rotatably connected with the rotor shell through second bearings; the stator support is fixedly connected with a stator core, windings are wound in tooth slots of the stator core, and permanent magnets are fixedly connected to the inner wall of the rotor shell; the outer rotor motor is cooled through the combination of the oil cooling structure and the air cooling structure.

2. The hybrid cooling structure outer rotor electric machine for air mobile according to claim 1, characterized in that, The stator support is in a columnar structure and is divided into an inner layer, an intermediate hollow layer and an outer layer; the inner layer is hollow, and the rotating shaft extends into the inner layer and is connected to the inner layer; the intermediate hollow layer surrounds the inner layer and is hollow in the inside; a plurality of fan-shaped air outlets are formed in the intermediate hollow layer; the outer layer is a wall body of the stator support, the inside of the wall body is provided with an oil channel cavity, the top of the outer periphery of the wall body is provided with an oil injection port, and the bottom of the outer periphery of the wall body extends outward to form an oil collecting groove.

3. The hybrid cooling structure outer rotor electric machine for air mobile according to claim 2, characterized in that, An oil pump is arranged at the bottom of the inner layer of the stator support; and the oil inlet and the oil outlet of the oil pump are connected to the oil channel cavity of the outer layer of the stator support through an oil inlet channel and an oil outlet channel.

4. The hybrid cooling structure outer rotor electric machine for air mobile according to claim 2, characterized in that, The intermediate hollow layer of the stator support is provided with heat dissipation fins, the heat dissipation fins are connected to the inner wall of the outer layer and extend towards the inner layer without contacting the inner layer.

5. The hybrid cooling structure outer rotor electric machine for air mobile according to claim 3, characterized in that, The oil cooling structure comprises an oil inlet, an oil inlet channel, an oil injection port, an oil outlet channel, an oil outlet, an oil channel cavity of the outer layer of the stator support and an oil collecting groove; oil is pumped into the oil inlet by the oil pump, enters the oil channel cavity of the outer layer of the stator support through the oil inlet channel, gradually flows from the bottom end to the top end of the cavity and is sprayed out of the oil injection port, and is sprayed on the stator core and the windings, thereby completing contact heat exchange.

6. The hybrid cooling structure outer rotor electric machine for air mobile according to claim 5, characterized in that, The oil droplets completing contact heat exchange fall on the oil collecting groove and are pumped back into the oil pump under the influence of the pressure difference of the oil pump, thereby completing oil circulation.

7. The hybrid cooling structure outer rotor electric machine for air mobile according to claim 4, characterized in that, The air cooling structure comprises fan-shaped air inlets, heat dissipation fins and fan-shaped air outlets of the intermediate hollow layer of the stator support; the blades fixed to the upper end cover generate lift under the rotation of the upper end cover; the air generated by the rotation of the blades blows downward; the rotation of the upper end cover forms a pressure difference, the air is sucked into the motor from the fan-shaped air inlets at the bottom of the intermediate hollow layer, passes through the area where the heat dissipation fins are located, is discharged from the fan-shaped air outlets at the top of the intermediate hollow layer and discharges heat from the side air outlets of the upper end cover, thereby completing air cooling and heat dissipation.

8. The hybrid cooling structure outer rotor electric machine for air mobile according to claim 4, characterized in that, The heat dissipation fins of the intermediate hollow layer not only absorb the heat generated by the operation of the outer rotor motor, but also absorb the heat of the oil completing heat exchange of the oil cooling structure.

9. The hybrid cooling structure outer rotor electric machine for air mobile according to claim 1, characterized in that, The upper end cover is provided with side air outlets, and the side air outlets are arranged on the side wall of the upper end cover.

10. The hybrid cooling structure outer rotor electric machine for air mobile according to claim 2, characterized in that, The oil collecting groove and the rotor shell are in contact through a sealing ring.

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