Motor with high torque density
By using a combined design of a casing, heat dissipation fins and solid-liquid phase change material made of aluminum alloy in the motor, the weight and volume increase caused by motor heat dissipation is solved, and high torque density and efficient heat dissipation are achieved to meet aviation Lightweight and high power density requirements for aerospace.
Patent Information
- Application Number
- CN202420744891.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-11
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-04-11
AI Technical Summary
The existing motors have increased weight and volume due to heat dissipation inefficiency under high power limit conditions, which cannot meet the requirements of lightweight and high power density in aerospace.
Using a motor case made of aluminum alloy, a plurality of through holes passing through the axially and circumferentially spaced heat fins are provided to form a closed housing cavity and filled with solid-liquid phase change material to absorb and store heat, and pass through The heat dissipation fins release heat to avoid excessive internal temperature, and at the same time, they use epoxy potting materials and control units to improve heat transfer efficiency.
It effectively improves the heat dissipation efficiency of the motor, avoids the increase in weight and volume, enhances the structural strength and reliability of the motor, and improves the practicality suitable for different environments.
Smart Images
Figure CN222301545U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of motors, and in particular to a motor with high torque density. Background Art
[0002] In recent years, with the increase in motor power, the heat dissipation of the motor has a direct impact on the performance of the motor, especially when the aerospace motor is running in high-power extreme conditions such as starting and acceleration. The temperature difference between the highest temperature zone of the winding and the motor casing is very different, which can easily lead to serious failures such as motor burning. The heat dissipation of the motor is mainly through air cooling or water cooling of the casing. In order to solve the above-mentioned motor heat dissipation problem, major motor manufacturers have carried out design optimization from multiple aspects such as increasing the size of the motor, increasing the blowing area, increasing the flow of the water pump, multi-physical field coupling structure design and its control method optimization. However, this will undoubtedly lead to a significant increase in the weight and volume of the motor and an increase in the cost directly caused by the attached heat dissipation and cooling system, and ultimately reduce its power density, which does not meet the lightweight and high power density requirements of aerospace. Utility Model Content
[0003] The technical problem to be solved by the present application is that heat dissipation leads to an increase in the weight and volume of the motor. In order to overcome the defects of the above-mentioned prior art, the present application provides a motor with a small size, increased heat transfer efficiency inside the motor casing, and a high torque density that allows fast heat dissipation.
[0004] The present application provides a motor with high torque density, which includes a motor housing, a front end cover and a rear end cover all made of aluminum alloy, the front end cover and the rear end cover are respectively detachably connected to the two ends of the motor housing, a plurality of heat dissipation fins are integrally provided on the outer peripheral wall of the motor housing along the circumferential direction, the motor housing is provided with a plurality of through holes penetrating along the axial direction, the plurality of through holes are arranged at intervals along the circumferential direction, the through holes and the front end cover and the rear end cover together form a closed accommodating cavity, and the accommodating cavity is filled with solid-liquid phase change material.
[0005] Compared with the prior art, the motor with high torque density disclosed in the present application has the following advantages: a accommodating cavity is provided and a solid-liquid phase change material is filled in the accommodating cavity, the solid-liquid phase change material can absorb and store the dissipated heat, that is, the instantaneous high temperature generated by the start-up or acceleration of the motor is absorbed and stored by the solid-liquid phase change material, and then the heat is released to the outside of the motor through the heat dissipation fins on the motor casing to prevent the temperature inside the motor from being too high, thereby avoiding an increase in the weight and volume of the motor, and effectively increasing the heat transfer efficiency inside the motor casing, thereby improving the heat dissipation efficiency of the motor. At the same time, the front cover and the rear cover are detachably connected to the two ends of the motor casing, that is, the solid-liquid phase change material in the accommodating cavity is convenient to add or replace. By replacing different types of solid-liquid phase change materials, the motor can be adapted to different usage environments, thereby improving practicality.
[0006] In a possible implementation, the solid-liquid phase change material is low melting point paraffin or hot melt adhesive material.
[0007] Compared with the prior art, the above technical solution can stably absorb and store the heat emitted by the motor, thereby improving the heat transfer effect inside the motor casing.
[0008] In a possible implementation manner, the circumferential width of the heat dissipation fins gradually decreases from the inside to the outside.
[0009] Compared with the prior art, the above technical solution can enhance the structural strength of the heat dissipation fins and improve the heat dissipation effect of the heat dissipation fins.
[0010] In a possible implementation, it also includes a stator assembly, which is fixed in the motor housing and is potted with an epoxy potting material, wherein the epoxy potting material includes paraffin, halloysite composite phase change material and aluminum powder.
[0011] Compared with the prior art, the above technical solution can improve the structural stability of the stator assembly and enhance the heat transfer effect inside the motor casing.
[0012] In a possible implementation manner, the rear end cover is provided with a plurality of heat dissipation holes connected to the interior of the motor casing.
[0013] Compared with the prior art, the above technical solution can further improve the heat dissipation effect of the motor.
[0014] In a possible embodiment, it also includes a control unit, which includes a circuit control board and a heat sink, wherein the circuit control board is fixed on the rear end cover and electrically connected to the lead-out wire head of the stator assembly, and the heat sink is used for heat dissipation of the circuit control board and is attached to the rear end cover.
[0015] Compared with the prior art, the above technical solution can integrate the control unit on the motor, and the heat sink can quickly transfer the heat to the motor casing, which is beneficial to the heat dissipation of the control unit.
[0016] In a possible implementation manner, the control unit further includes a cover shell, the cover shell is fixedly connected to the rear end cover, and the cover shell is arranged to cover the outer sides of the circuit control board and the heat dissipation plate.
[0017] Compared with the prior art, the above technical solution can be used to prevent dust and water from entering the control unit, thereby improving the operational reliability of the control unit.
[0018] In a possible embodiment, it also includes a rotor assembly rotatably disposed in the stator assembly, the rotor assembly including a rotating shaft, a rotor support, a rotor core and a permanent magnet, the rotating shaft being rotatably connected between the front end cover and the rear end cover via a bearing, the rotor support being integrally connected to the rotating shaft, the rotor core being fixedly connected to the rotor support, and the permanent magnet being connected to the rotor core and axially aligned with the stator assembly.
[0019] Compared with the prior art, the above technical solution can improve the operating reliability of the motor.
[0020] In a possible implementation manner, the rear end cover is recessed inwardly, and a resolver sensor is arranged in the recess.
[0021] Compared with the prior art, the above technical solution can reduce the axial size and improve the integration of the motor.
[0022] In a possible implementation manner, the front end cover and / or the rear end cover is provided with reinforcing ribs.
[0023] Compared with the prior art, the above technical solution can improve the structural strength of the motor casing and improve reliability. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 It is a schematic diagram of a three-dimensional structure of a motor with high torque density;
[0025] Figure 2 is a cross-sectional view of a motor with high torque density;
[0026] Figure 3 It is a structural diagram of the motor casing;
[0027] Figure 4 It is a structural diagram of the front end;
[0028] Figure 5 is a schematic diagram of the structure of the rear end cover;
[0029] Description of reference numerals:
[0030] 1. Motor housing; 11. Through hole; 2. Front cover; 3. Rear cover; 31. Heat dissipation hole; 32. Depression; 4. Heat dissipation fins; 5. Accommodating cavity; 6. Control unit; 61. Circuit control board; 62. Heat dissipation plate; 63. Cover; 7. Stator assembly; 8. Rotor assembly; 9. Rotary sensor; 10. Reinforcement ribs. DETAILED DESCRIPTION
[0031] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.
[0032] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.
[0033] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0034] At present, in order to solve the problem of motor heat dissipation, major motor manufacturers in the market have optimized their designs from multiple aspects, such as increasing the size of the motor, increasing the blowing area, increasing the flow of the water pump, and optimizing the multi-physics field coupling structure design and its control method. However, this will undoubtedly lead to a substantial increase in the weight and volume of the motor and an increase in the cost directly caused by the attached heat dissipation and cooling system, and ultimately reduce its power density, which does not meet the lightweight and high power density requirements of aerospace. The present application provides a motor with a high torque density that not only ensures a small motor size, but also increases the heat transfer efficiency inside the motor casing, allowing for fast heat dissipation.
[0035] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.
[0036] See also Figure 1-2As shown, an embodiment of the present application discloses a motor with high torque density, which includes a motor casing 1, a front end cover 2, a rear end cover 3, a stator assembly 7, a rotor assembly 8 and a control unit 6, wherein the motor casing 1, the front end cover 2 and the rear end cover 3 are all made of aluminum alloy, and the front end cover 2 and the rear end cover 3 are respectively detachably connected to the front and rear ends of the motor casing 1, the stator assembly 7 is fixedly arranged in the motor casing 1, and the rotor assembly 8 is rotatably arranged in the motor casing 1, and the rotor assembly 8 is axially aligned with the stator assembly 7, and the control unit 6 is fixedly arranged on the rear end cover 3 and electrically connected to the stator assembly 7.
[0037] Please continue to see Figure 2 In order to improve the heat dissipation effect of the motor, a plurality of heat dissipation fins 4 are integrally provided on the outer peripheral wall of the motor housing 1 along the circumferential direction, and a through hole 11 penetrating along the axial direction is provided on the motor housing 1. The through hole 11 and the front cover 2 and the rear cover 3 together form a closed accommodating cavity 5, that is, both ends of the through hole 11 are blocked by the front cover 2 and the rear cover 3, and the accommodating cavity 5 is filled with a solid-liquid phase change material. The solid-liquid phase change material is a prior art, that is, the solid-liquid phase change material can be used to absorb and store heat.
[0038] It can be known that by setting up the accommodating cavity 5 and filling the accommodating cavity 5 with solid-liquid phase change material, the solid-liquid phase change material absorbs and stores the heat emitted by the motor, that is, the instantaneous high temperature generated by the start-up or acceleration of the motor is absorbed and stored by the solid-liquid phase change material, and then the heat is released to the outside of the motor through the heat dissipation fins 4 on the motor casing 1 to prevent the temperature inside the motor from being too high, thereby avoiding the increase in the weight and volume of the motor, and effectively increasing the heat transfer efficiency inside the motor casing 1, and improving the heat dissipation efficiency of the motor. At the same time, the front cover 2 and the rear cover 3 are detachably connected to the two ends of the motor casing 1, that is, the solid-liquid phase change material in the accommodating cavity 5 is convenient to add or replace. By replacing different types of solid-liquid phase change materials, the motor can be adapted to different usage environments to improve practicality.
[0039] See also Figure 3 In this embodiment, the number of the through holes 11 is several, and the several through holes 11 form multiple groups of through holes 11. The multiple groups of through holes 11 are evenly distributed along the circumferential direction, and screw holes are provided between two adjacent groups of through holes 11, thereby making the heat absorption of the motor uniform and reducing the weight of the motor housing 1.
[0040] In this embodiment, the solid-liquid phase change material is paraffin or hot melt adhesive material with a low melting point, which can stably absorb and store the heat emitted by the motor and improve the heat transfer effect inside the motor housing 1.
[0041] See also Figure 3In this embodiment, the circumferential width of the heat dissipation fins 4 gradually decreases from the inside to the outside, thereby enhancing the structural strength of the heat dissipation fins 4 and improving the heat dissipation effect of the heat dissipation fins 4.
[0042] In this embodiment, the stator assembly 7 is potted with an epoxy potting material, wherein the epoxy potting material includes paraffin, halloysite composite phase change material and aluminum powder, thereby enhancing the heat transfer effect inside the motor housing 1.
[0043] See also Figure 5 In this embodiment, the rear end cover 3 is provided with a plurality of heat dissipation holes 31 connected to the interior of the motor housing 1, thereby further improving the heat dissipation effect of the motor.
[0044] See also Figure 2 In this embodiment, the control unit 6 includes a circuit control board 61, a heat sink 62 and a cover shell 63. The circuit control board 61 is fixed on the rear end cover 3 and is electrically connected to the lead-out wire head of the stator assembly 7. The heat sink 62 is used for heat dissipation of the circuit control board 61 and is attached to the rear end cover 3. The cover shell 63 is fixedly connected to the rear end cover 3, and the cover shell 63 covers the outer sides of the circuit control board 61 and the heat sink 62.
[0045] In this embodiment, the rotor assembly 8 includes a rotating shaft, a rotor bracket, a rotor core and a permanent magnet. The rotating shaft is rotatably connected between the front cover 2 and the rear cover 3 through a bearing, the rotor bracket is integrally connected to the rotating shaft, the rotor core is fixedly connected to the rotor bracket, and the permanent magnet is connected to the rotor core and is axially aligned with the stator assembly 7.
[0046] In this embodiment, the rear end cover 3 is provided with an inward recess 32 , and a resolver sensor 9 is provided in the recess 32 .
[0047] In this embodiment, a reinforcing rib 10 is provided on the front end cover 2 .
[0048] In the description of the embodiments of the present application, it should be noted that in the description of the present application, terms such as "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description, and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present application.
[0049] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "in the present embodiment", "specific example", or "some examples" etc. means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
[0050] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.
Claims
1. A motor with high torque density, comprising a motor housing (1), a front end cover (2) and a rear end cover (3) all made of aluminum alloy, wherein the front end cover (2) and the rear end cover (3) are detachably connected to both ends of the motor housing (1), and characterized in that: A plurality of heat dissipation fins (4) are integrally provided on the outer peripheral wall of the motor housing (1) along the circumferential direction. The motor housing (1) is provided with a plurality of through holes (11) penetrating along the axial direction. The plurality of through holes (11) are arranged at intervals along the circumferential direction. The through holes (11) and the front end cover (2) and the rear end cover (3) together form a closed accommodating cavity (5). The accommodating cavity (5) is filled with a solid-liquid phase change material.
2. The motor with high torque density according to claim 1, characterized in that The solid-liquid phase change material is paraffin or hot melt adhesive material with a low melting point.
3. The motor with high torque density according to claim 1, characterized in that The circumferential width of the heat dissipation fins (4) gradually decreases from the inside to the outside.
4. The motor with high torque density according to claim 3, characterized in that: It also includes a stator component (7), which is fixed in the motor housing (1) and is potted with an epoxy potting material.
5. The motor with high torque density according to claim 4, characterized in that: The rear end cover (3) is provided with a plurality of heat dissipation holes (31) which are in communication with the interior of the motor housing (1).
6. The electric machine with high torque density according to claim 5, characterized in that: It also includes a control unit (6), the control unit (6) including a circuit control board (61) and a heat sink (62), the circuit control board (61) being fixed on the rear end cover (3) and being electrically connected to the lead-out terminal of the stator assembly (7), the heat sink (62) being used for heat dissipation of the circuit control board (61) and being attached to the rear end cover (3).
7. The electric machine with high torque density according to claim 6, characterized in that: The control unit (6) further comprises a cover shell (63), wherein the cover shell (63) is fixedly connected to the rear end cover (3), and the cover shell (63) is arranged to cover the outer sides of the circuit control board (61) and the heat dissipation plate (62).
8. The motor with high torque density according to claim 4, characterized in that It also includes a rotor assembly (8) rotatably arranged in the stator assembly (7), the rotor assembly (8) including a rotating shaft, a rotor support, a rotor core and a permanent magnet, the rotating shaft is rotatably connected between the front end cover (2) and the rear end cover (3) via a bearing, the rotor support is integrally connected to the rotating shaft, the rotor core is fixedly connected to the rotor support, and the permanent magnet is connected to the rotor core and is axially aligned with the stator assembly (7).
9. The electric machine with high torque density according to claim 8, characterized in that The rear end cover (3) is arranged to be recessed inwardly (32), and a rotary sensor (9) is arranged in the recess (32).
10. The electric machine with high torque density according to claim 1, characterized in that The front end cover (2) and / or the rear end cover (3) are provided with reinforcing ribs (10).