A motor stator and aircraft for a single spiral waterway

Abstract

The present invention discloses a motor stator with a single spiral water channel, comprising a stator body, a stator jacket and a petal washer; the stator jacket is sleeved on the stator body, and a spiral flow channel for cooling liquid to flow is arranged between the stator jacket and the stator body; the petal washer is arranged on the outer ring of the stator jacket, and the petal washer expands outward after being matched with the stator jacket, so that the outer wall surface of the petal washer is closely matched with the inner ring of the iron core. The present invention adopts a spiral flow channel to dissipate heat from the motor, and the heat dissipation capacity is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of motors, and in particular to a motor stator and an aircraft for a single spiral waterway. Background Art

[0002] Outer rotor brushless motors have high torque, high speed, low power consumption and low noise. Therefore, electric aircraft usually use outer rotor brushless motors. Compared with aircraft powered by thermal engines, electric aircraft have low noise, are more concealed during military reconnaissance, and have higher survivability and mission success rate. Electric aircraft can be used in military reconnaissance, environmental monitoring, disaster relief and other fields.

[0003] The existing outer rotor brushless motor has the following problems:

[0004] 1. The power density of motors is getting higher and higher, and the heat dissipation problem is becoming more and more serious;

[0005] 2. For outer rotor brushless motors, there are designs that use liquid cooling cavities inside the motors for heat dissipation, but the liquid cooling cavities are integrated with the stators;

[0006] 3. The liquid-cooled cavity stator is designed as an integrated body. The inner wall of the iron core coil, the only heat source of the motor, is in contact with the outer wall of the stator. Due to the process requirements of motor assembly, there must be a certain gap between the diameter of the stator outer wall and the diameter of the iron core inner wall. This gap directly increases the thermal resistance of the heat transfer between the two walls, seriously affecting the heat transfer effect.

[0007] 4. The current solution is a large cavity to accommodate the circulating coolant. The cavity volume is large, the internal flow is turbulent, which increases the flow resistance, and the coolant circulation is slower in some parts, which easily leads to the local high temperature of the stator.

[0008] 5. In order to fill the gap between the stator outer ring wall and the core inner ring wall, you can apply thermal grease with high thermal conductivity. However, after processing, the inner and outer wall diameters are fixed. If you want to apply more grease, the gap should be larger. If the gap is small, the applied grease will be scraped off by the inner surface of the core when the core is installed, affecting the heat dissipation effect. Summary of the invention

[0009] The problem to be solved by the present invention is to provide a motor stator and an aircraft with a single spiral water channel, which adopts the spiral flow channel to dissipate heat from the motor, and the heat dissipation capacity is greatly improved.

[0010] The technical solution provided by the present invention for solving the above-mentioned problems is: a motor stator with a single spiral water channel, comprising a stator body, a stator jacket and a petal gasket; the stator jacket is sleeved on the stator body, and a spiral flow channel for the circulation of coolant is arranged between the stator jacket and the stator body; the petal gasket is arranged on the outer ring of the stator jacket, and the petal gasket expands outward after being matched with the stator jacket, so that the outer wall surface of the petal gasket is tightly matched with the inner ring of the iron core.

[0011] Preferably, the spiral flow channel is arranged on the outer circumferential surface of the stator body.

[0012] Preferably, a water inlet pipe and a water outlet pipe are provided on the stator body, the water inlet pipe is communicated with the upper part of the spiral flow channel, and the water outlet pipe is communicated with the lower part of the spiral flow channel.

[0013] Preferably, a low-resistance guide joint is installed at the transition section between the water inlet pipe and the spiral flow channel.

[0014] Preferably, an outer ring of the stator housing is provided with an external thread, and an inner ring of the petal gasket is provided with an internal thread matching the external thread.

[0015] Preferably, threaded hole 1 is provided on the upper and lower parts of the stator casing, threaded hole 2 is provided on the upper and lower parts of the stator body at positions corresponding to the threaded hole 1, and the threaded hole 1 and the threaded hole 2 are connected by bolts.

[0016] Preferably, the first threaded hole is provided with a groove, and the second threaded hole is provided with a boss matching with the groove.

[0017] Preferably, four pressing blocks for pressing the iron core are arranged on the top of the stator casing, and are used to press the top end surface of the iron core to limit the position of the iron core in the axial direction.

[0018] Preferably, an annularly arranged sealing rubber ring is provided on the upper and lower parts of the contact surface between the stator casing and the stator body.

[0019] Another object of the present invention is to disclose an aircraft, which includes a motor stator of a single spiral water channel as described in any one of the above items.

[0020] Compared with the prior art, the advantages of the present invention are:

[0021] 1.Compared with conventional solutions, liquid cooling greatly improves heat dissipation capacity.

[0022] 2. Compared with the conventional liquid-cooled stator design, the spiral flow channel makes the resistance of liquid flow lower. Under the same liquid cooling pump drive, the coolant flow rate is faster, and the surface area of ​​the coolant and the heat dissipation surface of the stator body is also increased, significantly increasing the heat transfer capacity. The conventional solution is that the coolant enters from the bottom, which easily makes the temperature of the area near the top of the core higher. In this solution, the coolant first enters the spiral flow channel from the top, making the temperature difference between the top and the bottom of the core smaller.

[0023] 3. With the stator jacket design, the wall of the stator jacket does not need to be made very thick, because the stator main structure has already ensured the strength of the entire liquid cooling structure. Thinner wall thickness means that the heat transferred from the iron core as a heat source to the stator body is faster and the thermal resistance is lower.

[0024] 4. Compared with the conventional one-piece cavity without any flow channel features, the stator body can significantly enhance the ability of the motor stator to withstand axial and radial loads during operation. This is particularly important for motors used in aircraft. It reduces deformation during operation and increases reliability and life. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0026] Figure 1 is an exploded schematic diagram of the present invention;

[0027] Figure 2 It is a schematic diagram of the three-dimensional structure of the stator body of the present invention;

[0028] Figure 3 is a front view of the stator body of the present invention;

[0029] Figure 4 yes Figure 3 AA section view;

[0030] Figure 5 It is a front view of the present invention;

[0031] Figure 6 yes Figure 5 CC cross-sectional view.

[0032] The accompanying drawings are marked with: 1. iron core, 2. petal gasket, 3. low-resistance guide joint, 4. pressure block, 5. external thread, 6. boss, 7. threaded hole one, 8. groove, 9. threaded hole two, 10. spiral flow channel, 11. stator casing, 12. water inlet pipe, 13. water outlet pipe, 14. stator body, 15. transition section. DETAILED DESCRIPTION

[0033] The following will describe the implementation methods of the present invention in detail with reference to the accompanying drawings and embodiments, so that the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0034] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the definition of "first" and "second" features can explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0036] In the present invention, unless otherwise specified and limited, the terms "assemble", "connect", 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 also be a mechanical connection; it can be directly connected, or it can be connected through an intermediate medium, or the two elements can be internally connected. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] The specific implementation example of the present invention is Figure 1-6 As shown, a motor stator with a single spiral water channel includes a stator body 14, a stator jacket 11 and a petal gasket 2; the stator jacket 11 is sleeved on the stator body 14, and a spiral flow channel 10 for cooling liquid to flow is arranged between the stator jacket 11 and the stator body 14; the petal gasket 2 is arranged on the outer ring of the stator jacket 11, and the petal gasket 2 expands outward after matching with the stator jacket 11, so that the outer wall surface of the petal gasket 2 is tightly matched with the inner ring of the iron core 1.

[0038] In this embodiment, the spiral flow channel 10 is arranged on the outer circumferential surface of the stator body 14 .

[0039] In this embodiment, a water inlet pipe 12 and a water outlet pipe 13 are provided on the stator body 14 . The water inlet pipe 12 is communicated with the upper portion of the spiral flow channel 10 , and the water outlet pipe 13 is communicated with the lower portion of the spiral flow channel 10 .

[0040] Specifically, the coolant enters from the water inlet pipe and passes directly to the top of the stator body, and then is guided to the spiral flow channel through a transitional straight pipe, and flows along the spiral flow channel to the bottom of the stator body. When it reaches the end of the spiral flow channel, it transitions to the water outlet pipe and flows out.

[0041] Among them, the water inlet pipe and the water outlet pipe are both provided with standard-specification threads for fixing external joints.

[0042] In this embodiment, a low-resistance guide joint 3 is installed at the transition section 15 between the water inlet pipe 12 and the spiral flow channel 10. The function of the low-resistance guide joint is to seal the transition area between the water inlet pipe and the spiral flow channel. The low-resistance guide joint has an arc groove design, so that the coolant can have a rounded transition when flowing through this area, which significantly reduces the flow resistance.

[0043] In this embodiment, an outer ring of the stator housing 11 is provided with an external thread 5 , and an inner ring of the petal gasket 2 is provided with an internal thread matching the external thread 5 .

[0044] In this embodiment, the upper and lower parts of the stator housing 11 are provided with threaded holes 7, and the upper and lower parts of the stator body 14 are provided with threaded holes 9 at positions corresponding to the threaded holes 7, and the threaded holes 7 and 9 are connected by bolts.

[0045] In this embodiment, the threaded hole 1 7 is provided with a groove 8, and the threaded hole 2 9 is provided with a boss 6 that matches the groove 8. Positioning and circumferential force transmission are performed through the boss and the groove.

[0046] In this embodiment, four pressing blocks 4 for pressing the iron core 1 are arranged on the top of the stator housing 11, and are used to press the top end surface of the iron core 1 to limit the position of the iron core 1 in the axial direction.

[0047] In this embodiment, an annular sealing rubber ring is provided on the upper and lower parts of the contact surface between the stator housing 11 and the stator body 14 .

[0048] Among them, air-cooled heat dissipation fins are integrated inside the stator body to assist in increasing the heat dissipation capacity while water cooling.

[0049] It should be noted that the coolant in the present invention may be not only pure water but also other commonly used coolants in industry, or even oil.

[0050] Among them, a temperature-controlled cooling fan can be integrated at the bottom of the motor stator body to enhance the air cooling and heat dissipation capabilities and cope with the situation where the liquid cooling fails.

[0051] Specifically, the installation process of the present invention is that the stator jacket is first transferred to the stator body, the petal washer is inserted into the inner ring of the core, and the outer ring of the petal washer and the contact surface with the core are pre-coated with thermal conductive silicone grease in advance. The petal washer itself is an ultra-thin wall part, and has four cuts for its own deformation margin for contraction and expansion. The external thread of the stator jacket is pre-coated with a certain amount of thermal conductive silicone grease, and then the core and petal washer assembly are screwed into the stator body and the external assembly according to the threaded engagement. As the threads are continuously screwed in, the petal washer will be pushed outward by the stator assembly, so that the outer wall of the petal washer is strongly pressed against the inner ring of the core until all the threads are screwed in. The petal washer is tightly and securely filled between the stator jacket and the core, and the gaps between them are evenly filled with high-performance thermal conductive silicone grease. In this way, the heat transfer thermal resistance of the multi-layer heat transfer interface is greatly reduced, and the heat transfer effect from the heating element to the coolant is significantly improved.

[0052] This embodiment also discloses an aircraft, which includes a motor stator of a single spiral water channel as described in any one of the above items.

[0053] The above description is only for the best embodiment of the present invention, but it should not be understood as limiting the claims. The present invention is not limited to the above embodiments, and its specific structure is allowed to be changed. All changes made within the scope of protection of the independent claims of the present invention are within the scope of protection of the present invention.

Claims

1. A motor stator with a single spiral water channel, comprising a stator body (14), characterized in that: It also includes a stator jacket (11) and a petal washer (2); the stator jacket (11) is sleeved on the stator body (14), and a spiral flow channel (10) for cooling liquid to flow is provided between the stator jacket (11) and the stator body (14); the petal washer (2) is provided on the outer ring of the stator jacket (11), and the petal washer (2) expands outwards after being matched with the stator jacket (11), so that the outer wall surface of the petal washer (2) is tightly matched with the inner ring of the iron core (1); The outer ring of the stator housing (11) is provided with an external thread (5), and the inner ring of the petal gasket (2) is provided with an internal thread matching the external thread (5); The external thread (5) of the stator housing (11) is pre-coated with a certain amount of thermal conductive silicone grease.

2. The motor stator of a single spiral water channel according to claim 1, characterized in that: The spiral flow channel (10) is arranged on the outer circumferential surface of the stator body (14).

3. The motor stator of a single spiral water channel according to claim 2, characterized in that: The stator body (14) is provided with a water inlet pipe (12) and a water outlet pipe (13); the water inlet pipe (12) is in communication with the upper portion of the spiral flow channel (10), and the water outlet pipe (13) is in communication with the lower portion of the spiral flow channel (10).

4. The motor stator of a single spiral water channel according to claim 3, characterized in that: A low-resistance guide joint (3) is installed at the transition section (15) between the water inlet pipe (12) and the spiral flow channel (10).

5. The motor stator of a single spiral water channel according to claim 1, characterized in that: The upper and lower parts of the stator housing (11) are both provided with threaded holes (7), and the upper and lower parts of the stator body (14) are provided with threaded holes (9) at positions corresponding to the threaded holes (7), and the threaded holes (7) and (9) are connected by bolts.

6. The motor stator of a single spiral water channel according to claim 5, characterized in that: The first threaded hole (7) is provided with a groove (8), and the second threaded hole (9) is provided with a boss (6) that matches the groove (8).

7. The motor stator of a single spiral water channel according to claim 1, characterized in that: Four pressing blocks (4) for pressing the iron core (1) are arranged on the top of the stator casing (11) and are used to press the top end surface of the iron core (1) so as to limit the position of the iron core (1) in the axial direction.

8. The motor stator of a single spiral water channel according to claim 1, characterized in that: The upper and lower parts of the contact surface between the stator casing (11) and the stator body (14) are both provided with an annularly arranged sealing rubber ring.

9. An aircraft, characterized in that: The aircraft comprises a motor stator of a single spiral water channel as described in any one of claims 1-8.

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