Tilted finned outer rotor motor and stratospheric airship

Abstract

The application provides a slanting fin outer rotor motor, which comprises an inner stator assembly, an outer rotor assembly, a motor controller, an inner stator fixing device and an outer rotor supporting device; the outer rotor assembly comprises an outer rotor, a permanent magnet block arranged on the inner surface of the outer rotor, a first cover plate and a second cover plate, the first cover plate and the second cover plate are respectively fixed at the two ends of the outer rotor along the axial direction, the outer rotor, the first cover plate and the second cover plate form a cavity and surround the inner stator assembly; the first cover plate is connected with the outer rotor supporting device; the outer surface of the outer rotor is arranged in the shape of a slanting fin, or the outer rotor assembly further comprises a slanting fin, and the slanting fin is fixed on the outer surface of the outer rotor; the inner stator fixing device is connected with the inner stator assembly; when the outer rotor rotates, the outer surface of the outer rotor in the shape of a slanting fin or the slanting fin rotates with the outer rotor and forms a first airflow in a fixed direction; the motor controller is arranged downstream of the first airflow.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of heat dissipation, in particular to the heat dissipation of the motor of a stratosphere airship. BACKGROUND

[0002] When the stratosphere airship flies in the stratosphere environment, the air flow heat dissipation effect is poor due to the thin air, and the heat dissipation of the motor of the propulsion system is a problem to be solved.

[0003] The traditional motor heat dissipation method usually needs to increase a fan and an air duct to improve the air flow heat dissipation efficiency, but thus increases the weight and energy consumption, and enhances the complexity of the system.

[0004] The currently researched stratosphere airship propulsion motor mostly adopts the permanent magnet inner rotor mode, and the heat of the inner rotor permanent magnet of this motor is difficult to be dissipated in the closed motor stator cavity after being heated, causing the temperature of the inner rotor to be very high. If the temperature exceeds the maximum working temperature of the permanent magnet, the permanent magnet is easy to demagnetize at high temperature. The occurrence of this situation will make the stratosphere airship propulsion system completely lose the propulsion power.

[0005] The content of the background section merely represents the technology known to the inventor, and does not necessarily represent the prior art in the field. SUMMARY

[0006] The present application is to develop the motor of the propulsion system of the stratosphere airship, solve the heat dissipation problem of the motor body of the stratosphere airship in the stratosphere environment, improve the demagnetization temperature critical point of the rotor permanent magnet, and solve the heat dissipation problem of the motor controller.

[0007] The present application provides a slant type heat dissipation fin outer rotor motor, which comprises an inner stator assembly, an outer rotor assembly, a motor controller, an inner stator fixing device and an outer rotor supporting device.

[0008] The outer rotor assembly comprises an outer rotor, a permanent magnet block arranged on the inner surface of the outer rotor, a first cover plate and a second cover plate, the first cover plate and the second cover plate are respectively fixed at the two ends of the outer rotor in the axial direction, the outer rotor, the first cover plate and the second cover plate form a cavity and surround the inner stator assembly; the first cover plate is connected with the outer rotor supporting device; the outer surface of the outer rotor is arranged in the shape of a slant type heat dissipation fin, or the outer rotor assembly further comprises a slant type heat dissipation fin, and the heat dissipation fin is fixed on the outer surface of the outer rotor.

[0009] The inner stator fixing device is connected with the inner stator assembly;

[0010] When the outer rotor rotates, the outer surface of the outer rotor in the shape of a slant type heat dissipation fin or the slant type heat dissipation fin rotates with the outer rotor, and forms a first airflow in a fixed direction;

[0011] The motor controller is arranged downstream of the first airflow.

[0012] The inclined fin shape of the outer rotor outer surface or the inclined fin can increase the flow rate of the cold air on the surface of the fin as the outer rotor rotates, and carry away more heat; at the same time, a first airflow is formed in the process of rotation, and the first airflow can cool the motor controller placed downstream of the first airflow.

[0013] Further, the inner stator assembly includes an inner stator and an inner stator tooth slot winding arranged on the inner stator.

[0014] Further, the inner stator fixing device includes an inner stator shaft fixing support frame, an inner stator shaft, and an inner stator shaft bearing. The inner stator shaft passes through the center of the second cover plate and connects the inner stator shaft fixing support frame and the inner stator assembly. The inner stator shaft bearing is arranged on the inner stator shaft and fixed on the second cover plate.

[0015] Further, the inner stator shaft bearing adopts a radial thrust bearing. The radial thrust bearing can simultaneously bear a relatively large range of radial force and axial force, and is suitable for airship motors that require axial force. The inner ring of the inner stator shaft bearing is fixedly connected with the inner stator shaft, and the outer ring is fixedly connected with the outlet fan. When the motor rotates, the inner ring of the inner stator shaft bearing is fixed with the inner stator shaft, and the outer ring of the inner stator shaft bearing rotates with the second cover plate.

[0016] Further, the outer rotor support device includes an outer rotor shaft fixing support frame, an outer rotor shaft, and an outer rotor shaft bearing. The outer rotor shaft is fixed at the center of the first cover plate, connects the first cover plate and the outer rotor shaft fixing support frame, and the outer rotor shaft bearing is arranged on the outer rotor shaft and fixed on the outer rotor shaft fixing support frame.

[0017] Further, the outer rotor shaft bearing adopts a radial thrust bearing. The radial thrust bearing can simultaneously bear a relatively large range of radial force and axial force, and is suitable for airship motors that require axial force. The inner ring of the outer rotor shaft bearing is fixedly connected with the outer rotor shaft, and the outer ring is fixedly connected with the outer rotor shaft fixing support frame. When the motor rotates, the inner ring of the outer rotor shaft bearing rotates with the first cover plate, and the outer ring of the outer rotor shaft bearing is fixed with the outer rotor shaft fixing support frame.

[0018] Further, the first cover plate and the outer rotor shaft are integrally formed.

[0019] Further, the first cover plate and the second cover plate are both fans with paddles, the first cover plate and the second cover plate rotate with the outer rotor to form a second airflow in a fixed direction, the airflow enters the chamber from the first cover plate and is discharged from the chamber through the second cover plate. The cover plates at both ends of the outer rotor are arranged in the form of fans with paddles, the first cover plate and the second cover plate rotate with the outer rotor of the motor, the first cover plate sucks in cold air, the cold air enters the chamber formed by the outer rotor, the first cover plate and the second cover plate, cools the inner stator, the tooth slot winding of the inner stator and the permanent magnet block in the chamber, and the cold air becomes hot air after heat exchange, and the hot air is discharged from the chamber through the second cover plate. In this way, the air in the outer rotor cavity is forced to flow, which plays a role in ventilation and heat dissipation.

[0020] Further, the first airflow direction and the second airflow direction are consistent. The directions of the first airflow and the second airflow are consistent, and the motor controller is subjected to forced convection cooling on the outer surface.

[0021] Further, the first cover plate includes outer circle paddles, middle circle reinforcing ribs and inner circle paddles, and the middle circle reinforcing ribs are arranged between the outer circle paddles and the inner circle paddles. The middle circle reinforcing ribs are used to enhance the mechanical strength and rigidity of the first cover plate.

[0022] Further, the second cover plate includes outer circle paddles, middle circle reinforcing ribs, inner circle paddles, inner circle reinforcing ribs and a shaft hole, the shaft hole is arranged at the center of the second cover plate, the inner circle reinforcing ribs are arranged between the inner circle paddles and the shaft hole, and the middle circle reinforcing ribs are arranged between the outer circle paddles and the inner circle paddles. The inner circle reinforcing ribs and the middle circle reinforcing ribs are used to enhance the mechanical strength and rigidity of the second cover plate.

[0023] Further, the permanent magnet block adopts a neodymium iron boron permanent magnet block or a samarium cobalt permanent magnet block.

[0024] Further, the permanent magnet block adopts a samarium cobalt permanent magnet block. The maximum magnetic energy product of the neodymium iron boron permanent magnet block is 260BH max / (kj / m 2 ), and the highest working temperature is 150℃. Although the maximum magnetic energy product of the samarium cobalt permanent magnet block is 200BH max / (kj / m 2 ), the highest working temperature is 300℃, so that the motor can work in a more severe thermal environment.

[0025] Further, the shape of the inclined heat dissipation fin on the outer surface of the outer rotor and the inclined heat dissipation fin both include two or more blades, and the angle between the blades and the rotation axis of the outer rotor is 45° or more and less than 90°, or more than 270° and less than 315°.

[0026] The angle between the blade and the outer rotor rotation axis is 45 degrees or more and less than 90 degrees according to the right-hand rule, the right thumb points to the direction of the first airflow, and the other fingers of the right hand point to the direction of the blade rotation.

[0027] Further, the angle between the blade and the outer rotor rotation axis is 60 degrees or 300 degrees.

[0028] Further, the blade adopts a turbine blade.

[0029] The application also provides a stratosphere airship comprising the inclined fin outer rotor motor.

[0030] The application has the following advantages:

[0031] The application adopts the outer rotor mode of the permanent magnet motor, and the rotor is used as the outer rotor to facilitate the heat dissipation of the permanent magnet block.

[0032] 1. The inclined fin is arranged on the outer surface of the motor outer rotor or the outer surface of the motor outer rotor is directly processed into the shape of the inclined fin, the outer radiation area of the outer rotor is increased, and the heat can be better radiated to the outside.

[0033] 2. With the rotation of the outer rotor, the inclined fin shape and the inclined fin form an air flow during the rotation of the outer rotor, increase the cold air flow rate of the fin surface, and carry away more heat.

[0034] 3. The inclined fin shape and the inclined fin form an air flow during the rotation of the outer rotor, and cool the motor controller placed downstream of the air flow.

[0035] 4. The samarium-cobalt permanent magnet block has a maximum working temperature of 300 DEG C, so that the motor can work in a more severe environment, and the demagnetization of the permanent magnet block is prevented.

[0036] 5. The first cover plate and the second cover plate are arranged as fans with blades, and the stator, the stator tooth slot winding and the permanent magnet block in the cooling chamber are cooled.

[0037] 6. The second airflow formed by the first cover plate and the second cover plate cools the motor controller. BRIEF DESCRIPTION OF DRAWINGS

[0038] The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and are intended to provide a further understanding of the application, and are made a part of the specification. The drawings are not to scale.

[0039] In the drawings:

[0040] Figure 1 is a schematic diagram of the outer rotor motor structure of Example 1;

[0041] Figure 2 is a schematic diagram of the outer rotor 7 structure of Example 1;

[0042] Figure 3 is a schematic diagram of the first cover plate structure of Example 1;

[0043] Figure 4 is a schematic diagram of the second cover plate structure of Example 1;

[0044] Figure 5 is a schematic diagram of the outer rotor motor structure of Example 2;

[0045] Figure 6 is a schematic diagram of the outer rotor 7 and inclined fin 13 structure of Example 2;

[0046] Wherein, 1 - inner stator shaft fixed support frame, 2 - inner stator shaft, 3 - inner stator shaft bearing, 4 - second cover plate, 5 - inner stator tooth slot winding, 6 - permanent magnet block, 7 - outer rotor, 8 - outer rotor shaft fixed support frame, 9 - outer rotor shaft, 10 - outer rotor shaft bearing, 11 - first cover plate, 12 - inner stator, 13 - inclined fin, 131 - blade, 132 - blade, 14 - motor controller, 15 - outer ring fan blade, 16 - shaft hole, 17 - middle ring reinforcing rib, 18 - inner ring fan blade, 19 - inner ring reinforcing rib, 20 - outer ring fan blade, 21 - middle ring reinforcing rib, 22 - inner ring fan blade, W1 - cold air of the second air flow, W2 - hot air of the second air flow, W3 - first air flow, a - angle between the blade of the outer rotor outer surface shape of the inclined fin and the rotation axis of the outer rotor, b - angle between the blade of the inclined fin and the rotation axis of the outer rotor. DETAILED DESCRIPTION

[0047] Hereinafter, only certain exemplary embodiments are described simply. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present application. Therefore, the drawings and the description are considered to be exemplary in nature rather than limiting.

[0048] In the description of the present application, it is to be understood by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can be explicitly or implicitly included one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0049] In the description of the present application, it is to be understood that the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected or can communicate with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0050] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings, it should be understood that the preferred embodiments described herein are only for the purpose of illustrating and explaining the present application, and are not intended to limit the present application.

[0051] Example 1:

[0052] This embodiment shows a slanted fin outer rotor motor, which comprises an inner stator assembly, an outer rotor assembly, an inner stator fixing device, an outer rotor supporting device and a motor controller.

[0053] As Figure 1 described, the inner stator assembly comprises an inner stator 12 and an inner stator tooth slot winding 5 fixed on the inner stator.

[0054] As Figure 1 shown, the outer rotor assembly comprises a permanent magnet block 6, an outer rotor 7, a first cover plate 11 and a second cover plate 4, the first cover plate 11 and the second cover plate 4 form a cavity and surround the inner stator 12 and the inner stator tooth slot winding 5. The outer surface of the outer rotor 7 is in the shape of a slanted fin, as Figure 2As shown, the outer surface of the outer rotor 7 in the shape of a slanted fin includes a plurality of blades 131, which are turbine blades, and the angle a between the blades 131 and the rotation axis of the outer rotor is greater than 45° and less than 90°, preferably 60°. The fins 13 rotate to form a first airflow W3, according to the right-hand rule, the right thumb points to the direction of the first airflow W3, and the other fingers of the right hand point to the rotation direction of the blades 131. The motor controller 14 is arranged downstream of the first airflow W3. The permanent magnet block 6 can be a neodymium iron boron permanent magnet block or a samarium cobalt permanent magnet block, preferably a samarium cobalt permanent magnet block, and the maximum working temperature of the samarium cobalt permanent magnet block is 300℃.

[0055] As a preferred embodiment, as shown in Figure 3 As shown, the first cover plate 11 is a fan with paddles, and the specific structure includes outer ring paddles 20, middle ring reinforcing ribs 21, and inner ring paddles 22. The middle ring reinforcing ribs 21 are arranged between the outer ring paddles 20 and the inner ring paddles 22 to enhance the mechanical strength and rigidity of the first cover plate 11. As shown in Figure 4 As shown, the second cover plate 4 is a fan with paddles, and the specific structure includes outer ring paddles 15, middle ring reinforcing ribs 17, inner ring paddles 18, inner ring reinforcing ribs 19, and a shaft hole 16. The shaft hole 16 is arranged at the center of the second cover plate 4, the inner stator shaft 2 of the inner stator fixing device passes through the shaft hole 16 to fix the inner stator 12, and the outer ring of the inner stator shaft bearing 3 on the inner stator shaft 2 is fixed with the shaft hole 16. The inner ring reinforcing ribs 19 are arranged between the inner ring paddles 18 and the shaft hole 16, the middle ring reinforcing ribs 17 are arranged between the outer ring paddles 15 and the inner ring paddles 18, and the inner ring reinforcing ribs 19 and the middle ring reinforcing ribs 17 are both used to enhance the mechanical strength and rigidity of the second cover plate 4.

[0056] As shown in Figure 1 The inner stator fixing device is used to fix the inner stator assembly, and includes an inner stator shaft fixing support frame 1, an inner stator shaft 2, and an inner stator shaft bearing 3. The inner stator shaft 2 passes through the shaft hole 16 at the center of the second cover plate 4, and connects the inner stator shaft fixing support frame 1 and the inner stator 12. The inner stator shaft bearing 3 is a radial thrust bearing, the inner ring of the inner stator shaft bearing 3 is fixed on the inner stator shaft 2, and the outer ring of the inner stator shaft bearing 3 is fixed with the shaft hole 16 of the second cover plate 4.

[0057] As shown in Figure 1 The outer rotor support device is used to support the rotation of the outer rotor assembly, and includes an outer rotor shaft fixing support frame 8, an outer rotor shaft 9, and an outer rotor shaft bearing 10. The outer rotor shaft 9 is fixed at the center of the first cover plate 11, and connects the first cover plate 11 and the outer rotor shaft fixing support frame 8. The outer rotor shaft 9 and the first cover plate 11 can be integrally formed or detachably connected. The outer rotor shaft bearing 10 is a radial thrust bearing, the inner ring of the outer rotor shaft bearing 10 is fixed on the outer rotor shaft 9, and the outer ring of the outer rotor shaft bearing 10 is fixed on the outer rotor shaft fixing support frame 8.

[0058] Under the control of the motor controller 14, the permanent magnet block 6 and the inner stator tooth slot winding 5 interact, the inner stator 12 is fixed under the action of the inner stator shaft 2 and the inner stator shaft fixed support frame 1, the outer rotor 7 rotates around the inner stator 12, and drives the outer surface of the outer rotor 7 in the shape of a slanted fin, the first cover plate 11, the second cover plate 4 and the outer rotor shaft 9 to rotate. Heat is generated in the process of rotation of the outer rotor 7, the permanent magnet block 6 transmits heat to the outer rotor 7, and the fin-shaped outer surface of the outer rotor 7 radiates heat to the outer space. Due to the shape of the slanted fin, a first airflow W3 is formed in the process of rotation, which accelerates the dissipation of heat and cools the motor controller 14 at the same time. At the same time, the first cover plate 11 absorbs cold air W1 in the process of rotation, the cold air W1 enters the cavity formed by the outer rotor 7, the first cover plate 11 and the second cover plate 4, cools the permanent magnet block 6, the inner stator 12 and the inner stator tooth slot winding 5, and forms hot air W2 after heat exchange; the hot air W2 is discharged from the cavity by the second cover plate 4, and the cold air W1 and the hot air W2 form a second airflow with strong exhaust cooling, which is consistent with the direction of the first airflow W3, and the second airflow cools the motor controller 14 at the same time. Through the above-mentioned way, the adaptability of the motor to work continuously in the stratosphere environment is significantly improved, and the demagnetization loss phenomenon caused by high heat of the permanent magnet block in the motor working in the stratosphere environment is eliminated.

[0059] Example 2:

[0060] This embodiment shows a slanted fin outer rotor motor, the structure of example 2 is basically the same as that of example 1, the difference is that: as shown in Figure 5 and Figure 6 the outer surface of the outer rotor 7 is a cylindrical surface, the outer rotor assembly further includes a fin 13 fixed on the outer surface of the outer rotor 7, the fin 13 includes a plurality of blades 132, the blades 132 are turbine blades, the blades 132 increase the area of the outer surface of the outer rotor 7, and the angle between the blades 132 and the rotation axis of the outer rotor 7 is β, β is greater than 270° and less than 315°, preferably 300°. The fin 13 rotates to form a first airflow W3, according to the left-hand rule, the left thumb points to the direction of the first airflow W3, and the other fingers of the left hand point to the rotation direction of the blades 132. The permanent magnet block 6 generates heat in the process of rotation, the heat is transmitted to the fin 13 through the outer rotor 7, and the fin 13 radiates heat to the outer space through the blades 132. The first airflow W3 cools the motor controller 14 downstream of the first airflow W3.

[0061] Example 3:

[0062] This embodiment shows a stratospheric airship, the stratospheric airship includes the slanted fin outer rotor motor of example 1 or example 2.

[0063] It should be pointed out finally that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent replacements to some technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An inclined fin outer rotor motor characterized by, The oblique fin outer rotor motor is a stratosphere airship motor, comprising an inner stator assembly, an outer rotor assembly, a motor controller, an inner stator fixing device and an outer rotor supporting device. The outer rotor assembly comprises an outer rotor, a permanent magnet block arranged on the inner surface of the outer rotor, a first cover plate and a second cover plate, the first cover plate and the second cover plate are respectively fixed at the two ends of the outer rotor in the axial direction, the outer rotor, the first cover plate and the second cover plate form a cavity and surround the inner stator assembly; the first cover plate is connected with the outer rotor supporting device; the outer surface of the outer rotor is arranged in the shape of an oblique fin, or the outer rotor assembly further comprises an oblique fin, the fin is fixed on the outer surface of the outer rotor; the shape of the oblique fin on the outer surface of the outer rotor and the oblique fin both comprise two or more blades, the angle between the blade and the outer rotor rotation axis is 45° or more and less than 90° or more than 270° and less than 315°; the blade adopts a turbine blade; The inner stator fixing device is connected with the inner stator assembly. The inner stator fixing device comprises an inner stator shaft fixing support frame, an inner stator shaft and an inner stator shaft bearing, the inner stator shaft passes through the center of the second cover plate and is connected with the inner stator shaft fixing support frame and the inner stator assembly, the inner stator shaft bearing is arranged on the inner stator shaft and is fixed on the second cover plate; The first cover plate and the second cover plate are both fans with blades, the first cover plate and the second cover plate rotate with the outer rotor to form a second airflow in a fixed direction, the airflow enters the cavity from the first cover plate and is discharged from the cavity through the second cover plate; The first cover plate comprises an outer ring blade, a middle ring reinforcing rib and an inner ring blade; the middle ring reinforcing rib is arranged between the outer ring blade and the inner ring blade; The second cover plate comprises an outer ring blade, a middle ring reinforcing rib, an inner ring blade, an inner ring reinforcing rib and a shaft hole; the shaft hole is arranged at the center of the second cover plate; the inner ring reinforcing rib is arranged between the inner ring blade and the shaft hole, and the middle ring reinforcing rib is arranged between the outer ring blade and the inner ring blade; The outer ring of the inner stator shaft bearing is fixed with the shaft hole of the second cover plate; The outer rotor supporting device comprises an outer rotor shaft fixing support frame, an outer rotor shaft and an outer rotor shaft bearing, the outer rotor shaft is fixed at the center of the first cover plate, connected with the first cover plate and the outer rotor shaft fixing support frame, and the outer rotor shaft bearing is arranged on the outer rotor shaft and fixed on the outer rotor shaft fixing support frame; When the outer rotor rotates, the outer surface of the outer rotor in the shape of the oblique fin or the oblique fin rotates with the outer rotor and forms a first airflow in a fixed direction; the direction of the first airflow is consistent with the direction of the second airflow; The motor controller is arranged downstream of the first airflow.

2. The inclined fin outer rotor motor according to claim 1, characterized by The inner stator assembly comprises an inner stator and an inner stator tooth slot winding arranged on the inner stator.

3. The inclined fin outer rotor motor according to claim 1, characterized by The inner stator shaft bearing adopts a radial thrust bearing.

4. The inclined fin outer rotor motor according to claim 1, characterized by The outer rotor shaft bearing adopts a radial thrust bearing.

5. The inclined fin outer rotor motor according to claim 1, characterized by The first cover plate and the outer rotor shaft are integrally formed.

6. The inclined fin outer rotor motor according to claim 1, characterized by The permanent magnet block adopts a neodymium iron boron permanent magnet block or a samarium cobalt permanent magnet block.

7. The inclined fin outer rotor motor according to claim 1, characterized by The angle between the blade and the outer rotor rotation axis is 60° or 300°.

8. A stratospheric airship, characterized by, The oblique fin outer rotor motor of any one of claims 1-7 is included.

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