Integrated direct-drive permanent magnet motor for fan

Abstract

The application discloses an integrated direct-drive permanent magnet motor for a fan and relates to the related technical field of the direct-drive permanent magnet motor, which comprises a motor shell, a front cover and a rear cover arranged on the two sides of the motor shell respectively and the following parts: a rotating shaft which is rotatably installed in the middle of the motor shell and is fixedly installed with a rotor thereon, a stator which is fixedly installed on the inner wall of the motor shell and is used in cooperation with the rotor, an air gap which is left between the rotor and the stator, and a plurality of ventilation holes which are formed in the rear cover; and a heat dissipation assembly which is arranged on the rotating shaft and comprises an outer heat dissipation fan which is fixedly installed on the rotating shaft, an air guide cover which is fixedly installed on the rear cover and is rotatably connected with the rotating shaft, and an auxiliary heat dissipation unit which is arranged on the air guide cover; the motor can be more comprehensively and effectively cooled by the internal and external combined heat dissipation mode, so that the stability and reliability of the motor during long-time operation can be ensured.

Description

Technical Field

[0001] This invention relates to the technical field of direct-drive permanent magnet motors, specifically a direct-drive permanent magnet motor for integrated fans. Background Technology

[0002] Direct-drive permanent magnet motors are a type of motor that uses permanent magnets in the motor rotor and achieves energy conversion through direct drive. They are widely used in new energy, industrial transmission and other fields. Under the background of the "dual carbon" goal, the combination of energy-saving concept and power generation technology presents a diversified development trend. On the one hand, it is to maximize the efficiency of the generator itself. On the other hand, it is to achieve energy-saving generators and comprehensive energy utilization at the generator set level in the power generation system.

[0003] Existing direct-drive permanent magnet motor cooling designs mostly rely on traditional air cooling or passive cooling through heat dissipation fins on the surface of the casing. Under high load and long-term operation conditions, heat is difficult to dissipate quickly, resulting in low heat dissipation efficiency. This leads to a continuous increase in the internal temperature of the motor, which can cause demagnetization of the permanent magnets and a decrease in the insulation performance of the windings, seriously affecting the motor's operational stability and service life. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an integrated direct-drive permanent magnet motor for wind turbines.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: This invention relates to an integrated direct-drive permanent magnet motor for fans, comprising a motor housing and a front cover and a rear cover respectively disposed on both sides of the motor housing, and further comprising: Rotary shaft: The rotating shaft is rotatably installed in the middle of the motor housing, and a rotor is fixedly installed on it. A stator that works with the rotor is fixedly installed on the inner wall of the motor housing relative to the rotor position. An air gap is left between the rotor and the stator. Several ventilation holes are opened on the rear cover. Heat dissipation assembly: The heat dissipation assembly is mounted on the rotating shaft and includes an external heat dissipation fan fixedly mounted on the rotating shaft, an air guide shroud fixedly mounted on the rear cover and rotatably connected to the rotating shaft, and an auxiliary heat dissipation unit mounted on the air guide shroud. Air duct assembly: The air duct assembly is installed inside the motor housing and is used in conjunction with the heat dissipation assembly. Multiple heat dissipation fins are fixedly installed on the outer surface of the motor housing.

[0006] As a preferred embodiment of the present invention, the heat dissipation assembly further includes a mounting plate fixedly mounted on the rear cover. The mounting plate has a plurality of air guide holes, which are arranged in front of the gap between two adjacent heat dissipation fins. The air guide shroud has a plurality of through holes, and each through hole is provided with a bimetallic strip for blocking the through hole. The air guide shroud is horn-shaped and the opening faces the rotor side.

[0007] As a preferred embodiment of the present invention, the bimetallic sheet is composed of an inner metal sheet and an outer metal sheet bonded together, wherein the coefficient of thermal expansion of the inner metal sheet is greater than that of the outer metal sheet, and the inner metal sheet is in contact with the outer surface of the air guide shroud.

[0008] As a preferred embodiment of the present invention, the auxiliary heat dissipation unit includes a liquid storage ring rotatably mounted on a rotating shaft, a connecting plate rotatably mounted on the liquid storage ring and the other end of the connecting plate being fixedly connected to an air guide shroud, an inner heat dissipation fan fixedly mounted on the liquid storage ring and a plurality of fan blades fixedly mounted on the inner heat dissipation fan, the liquid storage ring having an inner conical surface, a thermal expansion sleeve fixedly mounted on the rotating shaft opposite the inner conical surface, the outer surface of the thermal expansion sleeve being an outer conical surface used to cooperate with the inner conical surface, and a gap being left between the outer conical surface and the inner conical surface.

[0009] As a preferred embodiment of the present invention, a heat dissipation groove is provided inside the fan blade, and a liquid storage chamber is provided inside the liquid storage ring and the liquid storage chamber is connected to the heat dissipation groove. The heat dissipation groove extends from the root of the fan blade to the tip of the fan blade. A condensation groove is connected to the side of the heat dissipation groove near the tip of the fan blade. A one-way valve is provided between the condensation groove and the liquid storage chamber, so that the liquid in the condensation groove can only flow from the side of the condensation groove to the side of the liquid storage chamber.

[0010] As a preferred embodiment of the present invention, the width of the heat dissipation groove gradually increases from the root of the fan blade towards the tip of the fan blade.

[0011] As a preferred embodiment of the present invention, the air duct assembly includes a plurality of heat dissipation holes opened on the front cover, the plurality of heat dissipation holes being evenly distributed in an array along the circumference, a conical guide plate being fixedly installed inside the front cover, the guide plate having a conical surface on the side near the rotor, and a first guide groove being opened on the stator core yoke to guide cooling air to flow along the first guide groove, forming a forced convection channel inside the stator core.

[0012] As a preferred embodiment of the present invention, a second guide groove is formed between the protruding ridges on the outer wall of the rotor core. The centrifugal force generated by the rotation of the rotor is used to force the heat inside the rotor core out through the air in the second guide groove.

[0013] As a preferred embodiment of the present invention, the width of both the first guide groove and the second guide groove gradually decreases from the rear cover side to the front cover side.

[0014] As a preferred embodiment of the present invention, protective filters are provided at both the ventilation holes and the heat dissipation holes to prevent external dust, moisture, etc. from entering the motor.

[0015] The beneficial effects of this invention are: 1. This integrated fan uses a direct-drive permanent magnet motor. By setting up a heat dissipation component, when the temperature inside the motor is too high, the inner metal plate will bend towards the outer metal plate, releasing the obstruction of the through hole. Part of the airflow generated by the external cooling fan carries away the heat from the surface of the motor housing through the motor housing and cooling fins, while the other part of the airflow enters the motor through the through hole. The airflow flows directly through the main heat source for direct heat dissipation, resulting in high heat dissipation efficiency. Furthermore, as the temperature inside the motor increases, the degree of bending of the inner metal plate increases, and the exposed area of ​​the through hole increases accordingly, thereby increasing the amount of cooling air entering the motor, accelerating the heat dissipation efficiency inside the motor, and improving the cooling rate of the motor.

[0016] 2. This integrated fan uses a direct-drive permanent magnet motor. By setting up an auxiliary heat dissipation unit, when the temperature inside the motor rises, the thermal expansion sleeve expands due to heat, increasing its diameter. Its outer conical surface tightly fits against the inner conical surface of the liquid storage ring, generating a huge frictional force. When the shaft rotates, the frictional force between the inner and outer conical surfaces drives the internal cooling fan to rotate. The rotation of the internal cooling fan directly outputs the air entering the motor to the main heat source inside the motor, directly dissipating and cooling the main heat source inside the motor. This combination of internal and external heat dissipation can more comprehensively and effectively reduce the temperature of the motor, ensuring the stability and reliability of the motor during long-term operation.

[0017] 3. This integrated fan uses a direct-drive permanent magnet motor. By incorporating a heat dissipation tank, a liquid storage ring, a condensation tank, and a one-way valve, the internal cooling fan rotates, driving the liquid storage ring and fan blades to rotate as well. Under centrifugal force, the coolant in the liquid storage ring is pumped into the heat dissipation tank within the fan blades, absorbing heat and cooling the blades. The heated coolant accumulates at the tip of the fan blades and, under pressure difference, enters the condensation tank. It then flows back to the liquid storage chamber through the one-way valve for further cooling, completing the cycle. This allows the coolant in the liquid storage chamber to absorb heat and cool the fan blades, enhancing convective heat exchange between the hot air inside the motor and the fan blades during rotation, thus increasing the heat exchange rate between the fan blades and the hot air inside the motor during rotation.

[0018] 4. This integrated fan uses a direct-drive permanent magnet motor. By setting a first guide groove and a second guide groove, the high-speed rotating rotor in the air gap will form a viscous laminar flow, hindering heat transfer. By opening the second guide groove, the centrifugal force generated by the rotor rotation is used to accelerate the heat exchange rate between the air in the air gap. The stator core yoke has a first guide groove to guide the cooling air to flow along the first guide groove, forming a forced convection channel inside the stator core, improving the heat dissipation effect. 5. This integrated fan uses a direct-drive permanent magnet motor. By setting up heat dissipation holes and a deflector plate, air enters from one end of the air inlet, flows through the inside of the motor (air gap, winding ends, etc.), and is discharged from the heat dissipation holes at the other end. This forms a clear, complete cooling path that runs through the entire length of the motor, which can maximize the use of cooling air to remove internal heat. At the same time, the axial airflow helps to make the temperature distribution of the motor along the axial length more uniform, avoiding local overheating. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the integrated direct-drive permanent magnet motor for the fan of the present invention. Figure 2 This is a schematic diagram of the cross-sectional structure of the motor housing of the integrated direct-drive permanent magnet motor for fans according to the present invention; Figure 3 This is a schematic diagram of the external cooling fan structure of the direct-drive permanent magnet motor for the integrated fan of the present invention; Figure 4 This is a schematic diagram of the stator structure of the integrated direct-drive permanent magnet motor for fans of the present invention; Figure 5 This is a schematic diagram of the rotor structure of the integrated direct-drive permanent magnet motor for wind turbines of the present invention; Figure 6 This is a schematic diagram of the liquid storage ring structure of the integrated direct-drive permanent magnet motor for fans according to the present invention; Figure 7 yes Figure 5 Enlarged schematic diagram of the structure at point A in the middle; Figure 8 This is a schematic diagram of the thermal expansion sleeve structure of the integrated direct-drive permanent magnet motor for fans of the present invention; Figure 9 This is a schematic diagram of the liquid storage chamber structure of the integrated fan direct-drive permanent magnet motor of the present invention.

[0020] In the diagram: 1. Motor housing; 2. Front cover; 3. Rear cover; 4. Shaft; 5. Rotor; 6. Stator; 7. Ventilation hole; 8. Heat dissipation assembly; 81. External cooling fan; 82. Air guide shroud; 83. Auxiliary heat dissipation unit; 831. Liquid storage ring; 832. Internal cooling fan; 833. Fan blade; 834. Inner conical surface; 835. Thermal expansion sleeve; 836. Outer conical surface; 837. Heat dissipation groove; 838. Condensation groove; 839. One-way valve; 8310. Liquid storage chamber; 84. Mounting plate; 85. Guide hole; 86. Through hole; 87. Bimetallic strip; 871. Outer metal strip; 872. Inner metal strip; 9. Air duct assembly; 91. Heat dissipation hole; 92. Air guide plate; 93. First guide groove; 94. Second guide groove; 10. Heat dissipation fins; 11. Air gap. Detailed Implementation

[0021] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0022] Example: Figures 1 to 9 As shown, the integrated direct-drive permanent magnet motor for fans of the present invention includes a motor housing 1 and a front cover 2 and a rear cover 3 respectively disposed on both sides of the motor housing 1, and further includes: Rotating shaft 4: Rotating shaft 4 is rotatably installed in the middle of motor housing 1, and rotor 5 is fixedly installed on it. Stator 6, which works with rotor 5, is fixedly installed on the inner wall of motor housing 1 relative to rotor 5. An air gap 11 is left between rotor 5 and stator 6. Several ventilation holes 7 are opened on the rear cover 3. Heat dissipation component 8: Heat dissipation component 8 is disposed on the rotating shaft 4, and includes an external heat dissipation fan 81 fixedly mounted on the rotating shaft 4, an air guide shroud 82 fixedly mounted on the rear cover 3 and rotatably connected to the rotating shaft 4, and an auxiliary heat dissipation unit 83 disposed on the air guide shroud 82. Air duct assembly 9: The air duct assembly 9 is set inside the motor housing 1 and is used in conjunction with the heat dissipation assembly 8. Multiple heat dissipation fins 10 are fixedly installed on the outer surface of the motor housing 1. The heat dissipation assembly 8 also includes a mounting plate 84 fixedly installed on the rear cover 3. Several guide holes 85 are opened on the mounting plate 84. The guide holes 85 are arranged in front of the gap between two adjacent heat dissipation fins 10. Several through holes 86 are opened on the air guide shroud 82. Each through hole 86 is provided with a bimetallic strip 87 for blocking the through hole 86. The air guide shroud 82 is horn-shaped and the opening faces the rotor 5.

[0023] Specifically, when the motor is working, the rotating shaft 4 drives the external cooling fan 81 to rotate as well. The external cooling fan 81 rotates, drawing in outside air through the ventilation hole 7 and then blowing air onto the heat dissipation fins 10 on the motor housing 1 through the air guide shroud 82 and the air guide hole 85 to cool them down. This accelerates the air circulation around the heat dissipation fins 10, improves the heat dissipation effect of the heat dissipation fins 10, and allows the heat dissipation fins 10 to dissipate the heat generated by the motor in a timely manner. At the same time, blowing air onto the heat dissipation fins 10 can prevent dust from the external environment from adhering to the heat dissipation fins 10 and affecting the heat dissipation effect of the heat dissipation fins 10.

[0024] Among them, such as Figure 5 and Figure 7 As shown, the bimetallic strip 87 is composed of an inner metal strip 872 and an outer metal strip 871 bonded together. The coefficient of thermal expansion of the inner metal strip 872 is greater than that of the outer metal strip 871, and the inner metal strip 872 is in contact with the outer surface of the air guide shroud 82.

[0025] When the temperature inside the motor is within the normal range, the bimetallic strip 87 keeps the through hole 86 sealed, ensuring the stability of the rotor 5 and stator 6. When the temperature inside the motor is too high, because the expansion coefficient of the inner metal strip 872 is greater than that of the outer metal strip 871, the inner metal strip 872 will bend towards the outer metal strip 871 and release the obstruction of the through hole 86. Part of the airflow generated by the external cooling fan 81 carries away the heat on the surface of the motor housing 1 through the motor housing 1 and the cooling fins 10, while the other part of the airflow enters the motor through the through hole 86. The airflow flows directly through the main heat source (stator 6 winding, iron core, and near the permanent magnet of rotor 5) for direct heat dissipation, resulting in high heat dissipation efficiency. As the temperature inside the motor increases, the degree of bending of the inner metal strip 872 increases, and the exposed area of ​​the through hole 86 increases accordingly, thereby increasing the amount of cooling air entering the motor, accelerating the heat dissipation efficiency inside the motor, and improving the cooling rate of the motor.

[0026] Among them, such as Figure 2 , Figure 4 , Figure 6 , Figure 8 and Figure 9 As shown, the auxiliary heat dissipation unit 83 includes a liquid storage ring 831 rotatably mounted on a rotating shaft 4. A connecting plate is rotatably mounted on the liquid storage ring 831, and the other end of the connecting plate is fixedly connected to the air guide shroud 82. An inner heat dissipation fan 832 is fixedly mounted on the liquid storage ring 831, and several fan blades 833 are fixedly mounted on the inner heat dissipation fan 832. The liquid storage ring 831 has an inner conical surface 834. A thermal expansion sleeve 835 is fixedly mounted on the rotating shaft 4 at the position opposite to the inner conical surface 834. The outer surface of the thermal expansion sleeve 835 is set as an outer conical surface 836 that cooperates with the inner conical surface 834. A gap is left between the outer conical surface 836 and the inner conical surface 834.

[0027] Specifically, both the outer conical surface 836 and the inner conical surface 834 have friction surfaces. When the temperature inside the motor is within the normal range, due to the gap between the outer conical surface 836 and the inner conical surface 834, the rotation of the shaft 4 will drive the thermal expansion sleeve 835 to rotate, while the inner conical surface 834 will not rotate. When the temperature inside the motor rises, the thermal expansion sleeve 835 expands due to heat, increasing its diameter. Its outer conical surface 836 and the inner conical surface 834 of the liquid storage ring 831 are tightly fitted together, generating a huge frictional force. This causes the rotation of the shaft 4 to drive the internal cooling fan 832 to rotate through the frictional force between the inner conical surface 834 and the outer conical surface 836. The rotation of the internal cooling fan 832 directly outputs the air entering the motor to the main heat source inside the motor (stator 6 winding, iron core, and near the permanent magnet of rotor 5), directly cooling the main heat source inside the motor. This combination of internal and external cooling can more comprehensively and effectively reduce the temperature of the motor, ensuring the stability and reliability of the motor during long-term operation.

[0028] Among them, such as Figure 9 As shown, a heat dissipation groove 837 is provided inside the fan blade 833, and a liquid storage chamber 8310 is provided inside the liquid storage ring 831, and the liquid storage chamber 8310 is connected to the heat dissipation groove 837. The heat dissipation groove 837 extends from the root of the fan blade 833 to the tip of the fan blade 833. A condensation groove 838 is connected to the side of the heat dissipation groove 837 near the tip of the fan blade 833. A one-way valve 839 is provided between the condensation groove 838 and the liquid storage chamber 8310, so that the liquid in the condensation groove 838 can only flow from the side of the condensation groove 838 to the side of the liquid storage chamber 8310.

[0029] Specifically, when the internal cooling fan 832 rotates, it drives the coolant storage ring 831 and fan blades 833 to rotate as well. Under the action of centrifugal force, the coolant in the storage ring 831 is pumped into the heat dissipation groove 837 in the fan blades 833, performing heat absorption and cooling on the fan blades 833. The heated coolant accumulates at the tip of the fan blades 833 and enters the condensation tank 838 under the action of pressure difference. Then, it flows back to the storage chamber 8310 through the one-way valve 839 for cooling, completing the cycle. (If the motor speed is too high, the centrifugal force on the coolant is too large, and the coolant is not enough to flow back under the action of pressure difference, the linear velocity at the tip of the fan blades 833 also increases due to the increase in motor speed.) The tip region absorbs a large amount of heat, causing the coolant there to vaporize and generate a steam flow. Because the steam density is low, the force it experiences in the centrifugal field is much smaller than that of the liquid. Therefore, it moves towards the root of the fan blade 833 in the low-pressure central region. In the relatively low-temperature area at the root of the fan blade 833, the steam condenses into liquid upon encountering the cold wall surface. The condensed liquid is then fed back into the heat dissipation tank 837 under the action of centrifugal force, completing the circulation. Thus, the coolant in the liquid storage chamber 8310 can absorb heat and cool the fan blade 833, thereby enhancing the convective heat transfer between the hot air inside the motor and the fan blade 833 during rotation and increasing the heat exchange rate between the fan blade 833 and the hot air inside the motor during rotation.

[0030] Among them, such as Figure 9 As shown, the width of the heat dissipation slot 837 gradually increases from the root of the fan blade 833 to the tip of the fan blade 833. The linear velocity of the tip area of ​​the fan blade 833 is the highest, and it comes into contact with more hot air, so the heat dissipation demand may be greater. Increasing the channel volume can accommodate more coolant for heat exchange in this area.

[0031] Among them, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the air duct assembly 9 includes several heat dissipation holes 91 opened on the front cover 2. The several heat dissipation holes 91 are evenly distributed in an array along the circumference. A conical air guide plate 92 is fixedly installed inside the front cover 2. The air guide plate 92 has a conical surface on the side near the rotor 5. A first guide groove 93 is opened on the yoke of the stator core 6 to guide the cooling air to flow along the first guide groove 93, forming a forced convection channel inside the stator core 6.

[0032] Specifically, air enters through the ventilation hole 7 at one end of the motor, flows through the motor interior (air gap 11, winding ends, etc.), and exits through the heat dissipation hole 91 at the other end. This forms a clear, complete cooling path that runs through the entire length of the motor, maximizing the use of cooling air to remove internal heat. At the same time, the axial airflow helps to make the temperature distribution of the motor along its axial length more uniform, avoiding local overheating. By setting the guide plate 92, the exhaust air can be guided, allowing the air to be smoothly discharged through the heat dissipation hole 91, preventing air accumulation from affecting the heat dissipation effect on the motor.

[0033] Among them, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, a second guide groove 94 is opened between the protruding ridges on the outer wall of the rotor 5 iron core. The groove depth is 1 / 4 to 1 / 3 of the radial thickness of the rotor 5 iron core. Using the centrifugal force generated by the rotation of the rotor 5, the heat inside the rotor 5 iron core is forcibly thrown out through the air in the second guide groove 94.

[0034] Specifically, the high-speed rotating rotor 5 in the air gap 11 will form a viscous laminar flow, which hinders heat transfer. By opening the second guide groove 94, the centrifugal force generated by the rotation of the rotor 5 is used to accelerate the heat exchange rate between the air in the air gap 11 and improve the heat dissipation effect.

[0035] Among them, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the width of the first guide groove 93 and the second guide groove 94 gradually decreases from the rear cover 3 side to the front cover 2 side, which can accelerate the gas flowing through the first guide groove 93 and the second guide groove 94 and improve the heat dissipation effect.

[0036] Protective filters are installed at both the ventilation hole 7 and the heat dissipation hole 91 to prevent external dust, moisture, and other contaminants from entering the motor and to ensure a stable working environment for the motor.

[0037] Specifically, when the temperature inside the motor rises, a portion of the airflow generated by the external cooling fan 81 enters the motor through the through-hole 86 to cool the motor interior. The internal cooling fan 832 rotates with the shaft 4 to further improve the heat dissipation efficiency inside the motor. When the motor is working, the rotating shaft 4 drives the external cooling fan 81 to rotate as well. The external cooling fan 81 rotates and draws in outside air through the ventilation hole 7. The air is then blown onto the heat dissipation fins 10 on the motor housing 1 through the air guide shroud 82 and the air guide hole 85 to cool down the air. This accelerates the air circulation around the heat dissipation fins 10 and improves the heat dissipation effect of the heat dissipation fins 10. This allows the heat dissipation fins 10 to dissipate the heat generated by the motor in a timely manner. At the same time, blowing air onto the heat dissipation fins 10 can prevent dust from the outside environment from adhering to the heat dissipation fins 10. When the temperature inside the motor is within the normal range, the bimetallic strip 87 keeps the through hole 86 sealed. Since there is a gap between the outer conical surface 836 and the inner conical surface 834, when the rotating shaft 4 rotates, it will drive the thermal expansion sleeve 835 to rotate as well, while the inner conical surface 834 will not rotate. When the temperature inside the motor is too high, because the expansion coefficient of the inner metal sheet 872 is greater than that of the outer metal sheet 871, the inner metal sheet 872 will bend towards the outer metal sheet 871, thus removing the obstruction to the through hole 86. Part of the airflow generated by the external cooling fan 81 carries away the heat from the surface of the motor housing 1 through the motor housing 1 and the cooling fins 10, while the other part of the airflow enters the motor through the through hole 86. The airflow directly flows through the main heat sources (stator 6 winding, iron core, and the vicinity of the rotor 5 permanent magnet) for direct heat dissipation, resulting in high heat dissipation efficiency. Furthermore, as the temperature inside the motor increases... As the rotor 5 increases in height, the inner metal sheet 872 bends more, and the exposed area of ​​the through hole 86 increases accordingly. This increases the amount of cooling air entering the motor and accelerates the heat dissipation efficiency inside the motor. At the same time, through the first guide groove 93 and the second guide groove 94, the centrifugal force generated by the rotation of the rotor 5 accelerates the heat exchange rate between the air in the air gap 11 and improves the heat dissipation effect. The stator 6 core yoke is provided with a first guide groove 93 to guide the cooling air to flow along the first guide groove 93, forming a forced convection channel inside the stator 6 core and improving the heat dissipation effect inside the motor. Meanwhile, the thermal expansion sleeve 835 expands due to heat, increasing its diameter. Its outer conical surface 836 fits tightly against the inner conical surface 834 of the liquid storage ring 831, generating a huge frictional force. When the rotating shaft 4 rotates, the frictional force between the inner conical surface 834 and the outer conical surface 836 drives the inner cooling fan 832 to rotate. The rotation of the inner cooling fan 832 directly outputs the air entering the motor to the main heat source inside the motor, directly cooling the main heat source inside the motor. The heat generated inside the motor is also discharged through the heat dissipation hole 91. This combination of internal and external heat dissipation can more comprehensively and effectively reduce the temperature of the motor, ensuring the stability and reliability of the motor during long-term operation. Simultaneously, when the internal cooling fan 832 rotates, it drives the liquid storage ring 831 and fan blades 833 to rotate as well. Under the action of centrifugal force, the coolant in the liquid storage ring 831 is pumped into the heat dissipation groove 837 in the fan blades 833 to absorb heat and cool the fan blades 833. The heated coolant accumulates at the tip of the fan blades 833 and enters the condensation tank 838 under the action of pressure difference. Then, it flows back to the liquid storage chamber 8310 through the one-way valve 839 for cooling, completing the cycle. (If the motor speed is too high, the centrifugal force on the coolant is too large, and the coolant is not enough to flow back under the action of pressure difference, the linear velocity at the tip of the fan blades 833 also increases due to the increase in motor speed, causing the blades to...) The tip region absorbs a large amount of heat, causing the coolant there to vaporize and generate a steam flow. Because the steam density is low, the force it experiences in the centrifugal field is much smaller than that of the liquid. Therefore, it moves towards the root of the fan blade 833 in the low-pressure central region. In the relatively low-temperature area at the root of the fan blade 833, the steam condenses into liquid upon encountering the cold wall surface. The condensed liquid is then fed back into the heat dissipation tank 837 under the action of centrifugal force, completing the cycle. Thus, the coolant in the liquid storage chamber 8310 can absorb heat and cool the fan blade 833, thereby enhancing the convective heat transfer between the hot air inside the motor and the fan blade 833 during rotation and increasing the heat exchange rate between the fan blade 833 and the hot air inside the motor during rotation.

[0038] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention 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 substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A direct-drive permanent magnet motor for an integrated fan, comprising a motor housing (1) and a front cover (2) and a rear cover (3) respectively disposed on both sides of the motor housing (1), characterized in that, Also includes: Rotary shaft (4): The rotating shaft (4) is rotatably installed in the middle of the motor housing (1), and a rotor (5) is fixedly installed on it. A stator (6) that works with the rotor (5) is fixedly installed on the inner wall of the motor housing (1) relative to the rotor (5). An air gap (11) is left between the rotor (5) and the stator (6). Several ventilation holes (7) are opened on the rear cover (3). Heat dissipation assembly (8): The heat dissipation assembly (8) is set on the rotating shaft (4), and includes an external heat dissipation fan (81) fixedly installed on the rotating shaft (4), a wind guide shroud (82) fixedly installed on the rear cover (3) and rotatably connected to the rotating shaft (4), and an auxiliary heat dissipation unit (83) set on the wind guide shroud (82). Air duct assembly (9): The air duct assembly (9) is set inside the motor housing (1) and used in conjunction with the heat dissipation assembly (8). Multiple heat dissipation fins (10) are fixedly installed on the outer surface of the motor housing (1).

2. The integrated direct-drive permanent magnet motor for fans according to claim 1, characterized in that, The heat dissipation assembly (8) also includes a mounting plate (84) fixedly mounted on the rear cover (3). The mounting plate (84) has several flow guide holes (85). The flow guide holes (85) are arranged in the gap between two adjacent heat dissipation fins (10). The air guide shroud (82) has several through holes (86). Each through hole (86) is provided with a bimetallic strip (87) for blocking the through hole (86). The air guide shroud (82) is horn-shaped and the opening faces the rotor (5).

3. The integrated direct-drive permanent magnet motor for fans according to claim 2, characterized in that, The bimetallic sheet (87) consists of an inner metal sheet (872) and an outer metal sheet (871) bonded together. The coefficient of thermal expansion of the inner metal sheet (872) is greater than that of the outer metal sheet (871), and the inner metal sheet (872) is attached to the outer surface of the air guide shroud (82).

4. The integrated direct-drive permanent magnet motor for fans according to claim 2, characterized in that, The auxiliary heat dissipation unit (83) includes a liquid storage ring (831) rotatably mounted on a rotating shaft (4). A connecting plate is rotatably mounted on the liquid storage ring (831), and the other end of the connecting plate is fixedly connected to the air guide shroud (82). An inner heat dissipation fan (832) is fixedly mounted on the liquid storage ring (831), and several fan blades (833) are fixedly mounted on the inner heat dissipation fan (832). The liquid storage ring (831) has an inner conical surface (834). A thermal expansion sleeve (835) is fixedly mounted on the rotating shaft (4) directly opposite the inner conical surface (834). The outer surface of the thermal expansion sleeve (835) is set as an outer conical surface (836) that cooperates with the inner conical surface (834). A gap is left between the outer conical surface (836) and the inner conical surface (834).

5. The integrated direct-drive permanent magnet motor for fans according to claim 4, characterized in that, The fan blade (833) has a heat dissipation groove (837) inside. The liquid storage ring (831) has a liquid storage chamber (8310) inside and the liquid storage chamber (8310) is connected to the heat dissipation groove (837). The heat dissipation groove (837) extends from the root of the fan blade (833) to the tip of the fan blade (833). The side of the heat dissipation groove (837) near the tip of the fan blade (833) is connected to a condensation groove (838). A one-way valve (839) is provided between the condensation groove (838) and the liquid storage chamber (8310) so that the liquid in the condensation groove (838) can only flow from the side of the condensation groove (838) to the side of the liquid storage chamber (8310).

6. The integrated direct-drive permanent magnet motor for fans according to claim 5, characterized in that, The width of the heat dissipation groove (837) gradually increases from the root of the fan blade (833) toward the tip of the fan blade (833).

7. The integrated direct-drive permanent magnet motor for fans according to claim 1, characterized in that, The air duct assembly (9) includes several heat dissipation holes (91) opened on the front cover (2). The several heat dissipation holes (91) are evenly distributed in an array along the circumference. A conical guide plate (92) is fixedly installed inside the front cover (2). The guide plate (92) has a conical surface on the side near the rotor (5). The stator (6) core yoke is provided with a first guide groove (93) to guide the cooling air to flow along the first guide groove (93) to form a forced convection channel inside the stator (6) core.

8. The integrated direct-drive permanent magnet motor for fans according to claim 7, characterized in that, A second guide groove (94) is opened between the protruding ridges on the outer wall of the rotor (5) core. The centrifugal force generated by the rotation of the rotor (5) is used to force the heat inside the rotor (5) core out through the air in the second guide groove (94).

9. The integrated direct-drive permanent magnet motor for fans according to claim 8, characterized in that, The width of the stator (6) guide groove and the rotor (5) guide groove gradually decreases from the rear cover (3) side to the front cover (2) side.

10. The integrated direct-drive permanent magnet motor for fans according to claim 7, characterized in that, Protective filters are provided at the ventilation holes (7) and heat dissipation holes (91) to prevent external dust and moisture from entering the motor.

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