Integral variable frequency motor

Abstract

This disclosure provides an integrated variable frequency motor, comprising: a motor, including a motor housing and a rotating shaft extending from the motor housing in the axial direction, the rotating shaft including a front end and a rear end, a cooling fan being disposed at the rear end of the rotating shaft, and a fan shroud being disposed outside the cooling fan; and a frequency converter, disposed on the radial side above the motor housing, the frequency converter including a frequency converter housing and at least one heat-generating electronic device, the bottom of the frequency converter housing being fixed to the top of the motor housing, the fan shroud including a top wall having multiple openings and an outer peripheral wall that together with the top wall defines a cavity, the cooling fan being housed in the cavity, a window being provided on the side of the outer peripheral wall opposite to the frequency converter, the window being disposed directly below the frequency converter housing and guiding the cooling airflow generated by the rotation of the cooling fan toward the frequency converter to cool at least one heat-generating electronic device, and a certain distance existing between the edge of the outer peripheral wall and the outer edge of the window near the edge of the outer peripheral wall.

Description

Technical Field

[0001] This disclosure relates to the field of motor technology, and more particularly to an integrated variable frequency motor with improved heat dissipation efficiency. Background Technology

[0002] In modern industrial automation, motors such as three-phase permanent magnet synchronous motors and asynchronous motors are widely used due to their high efficiency and precise control capabilities. When these motors are integrated with frequency converters to form a single variable frequency motor, wider speed control and higher energy efficiency can be achieved. However, this integration brings challenges in heat dissipation, especially in the area of ​​the frequency converter mounted above the motor housing. The power electronic devices in the frequency converter generate a large amount of heat during operation, which not only affects the motor's heat dissipation but may also lead to overheating of the entire system, thereby affecting the stability and lifespan of the equipment.

[0003] Currently, most integrated variable frequency motors on the market use air cooling for heat dissipation, meaning that a fan at the rear of the motor generates airflow to guide heat to the motor surface. However, in the inverter area, due to the large gap between the inverter and the motor housing, airflow cannot effectively reach the inverter, leading to heat accumulation. To solve this problem, inverter manufacturers usually design cooling fins at the bottom of the inverter or add an additional fan. However, this approach has the following drawbacks:

[0004] -Limitations in heat dissipation fin design: The effectiveness of heat dissipation fins is limited by the size of the gap between the inverter and the top of the motor housing, and their design often leads to airflow turbulence, affecting heat dissipation efficiency and potentially increasing noise.

[0005] - High cost of additional fans: While adding a fan to the inverter adapter plate can increase heat dissipation, it will significantly increase the overall cost of the integrated inverter motor.

[0006] - Poor ventilation design of the fan cover: In order to increase the ventilation area, some designs attempt to remove all the material above the fan on the fan cover. However, this will weaken the mechanical strength of the fan cover and affect its protective function. At the same time, removing too much material may also cause airflow turbulence and reduce the heat dissipation effect.

[0007] Therefore, existing heat dissipation solutions struggle to meet cooling requirements while simultaneously considering cost, shroud strength, and noise control, limiting the application and development of integrated variable frequency motors in industrial automation. Thus, an improved heat dissipation solution is urgently needed to enhance heat dissipation efficiency while maintaining equipment performance. Utility Model Content

[0008] To address the aforementioned issues, this disclosure proposes an integrated variable frequency motor with improved heat dissipation efficiency, particularly enhancing the heat dissipation efficiency of heat-generating electronic components in the inverter located above the motor.

[0009] According to one aspect of the present disclosure, an integrated variable frequency motor is provided, comprising: a motor, the motor including a motor housing and a rotating shaft extending from the motor housing in an axial direction, the rotating shaft including a front end and a rear end, a cooling fan being disposed at the rear end of the rotating shaft, and a fan shroud being disposed outside the cooling fan; and a frequency converter, the frequency converter being disposed on the radial side above the motor housing, the frequency converter including a frequency converter housing and at least one heat-generating electronic device disposed within the frequency converter housing, wherein the bottom of the frequency converter housing is opposite to and fixed together with the top of the motor housing, wherein the fan shroud includes a top wall having a plurality of openings and an outer peripheral wall that together with the top wall defines a cavity, the cooling fan being accommodated in the cavity, wherein a window is provided on the side of the outer peripheral wall opposite to the frequency converter, the window being disposed directly below the frequency converter housing and guiding the cooling airflow generated by the rotation of the cooling fan toward the frequency converter to cool at least one heat-generating electronic device, wherein there is a certain distance between the edge of the outer peripheral wall and the outer edge of the window near the edge of the outer peripheral wall.

[0010] By creating windows on the side of the motor's fan shroud opposite the inverter, airflow guidance is enhanced, and energy loss during transmission is reduced, thereby improving the overall system's heat dissipation performance. Specifically, because the windows are positioned directly below the inverter housing, the cooling airflow generated by the cooling fan is directly and effectively guided to the heat-generating electronic components of the inverter, accelerating heat dissipation and preventing performance degradation or damage to these components due to overheating. Furthermore, this arrangement also considers the mechanical strength of the fan shroud, avoiding structural weakening caused by removing all material from the top of the fan shroud. Therefore, by introducing windows, the heat dissipation of the inverter in the integrated unit can be effectively improved without increasing additional costs.

[0011] In embodiments of this disclosure, the inverter housing extends axially toward the rear end of the shaft beyond the window.

[0012] In embodiments of this disclosure, the window has a front outer edge near the front end and a rear outer edge away from the front end, and the end face of the inverter housing located at the rear end of the shaft is further away from the front end of the shaft in the axial direction of the motor housing than the rear outer edge of the window.

[0013] In this way, the inverter housing can completely cover the window, reducing the adverse effects of external environmental factors on the motor's cooling fan; for example, it enhances the dust protection of the fan cover. Furthermore, the extended portion of the inverter housing can also serve as physical isolation, preventing unnecessary short circuits or backflows in the airflow before it reaches the inverter, thereby improving the directionality and effectiveness of the airflow.

[0014] In embodiments of this disclosure, the window is shaped as an array of ventilation holes, the array of ventilation holes including a plurality of ventilation holes forming a mesh structure and an outer edge surrounding the mesh structure, wherein ribs are provided between adjacent ventilation holes in the plurality of ventilation holes.

[0015] In this way, the mesh-like window structure optimizes the distribution and direction of airflow, ensuring that the airflow generated by the cooling fan can evenly and effectively cover the heat-generating area of ​​the inverter. At the same time, compared to completely removing the material above the fan cover or removing large pieces of material above the fan cover, the design of the ribbed mesh-like window structure helps to enhance the structural strength of the fan cover and prevent the fan cover from deforming.

[0016] In embodiments of this disclosure, the shape of the mesh structure includes squares, rectangles, circles, or polygons.

[0017] In this way, by adopting regular shapes, it helps to simplify the manufacturing process and reduce production costs.

[0018] In embodiments of this disclosure, the mesh structure is square or rectangular in shape and the ventilation holes are square in shape. Multiple ventilation holes are arranged along the axial direction and in a direction perpendicular to the axial direction. The number of multiple ventilation holes depends on the opening ratio of the window on the side and the size of each ventilation hole.

[0019] By choosing squares or rectangles as the shape of the grid structure, a larger ventilation area can be provided within the same size, thereby improving heat exchange efficiency. Furthermore, this array arrangement maintains both ventilation efficiency and structural strength of the fan shroud.

[0020] In embodiments of this disclosure, the distance between the edge of the outer peripheral wall and the outer edge of the window near the edge of the outer peripheral wall is between 5 mm and 10 mm.

[0021] In this way, by setting the distance between the edge of the outer peripheral wall of the fan cover and the outer edge of the window near the outer peripheral wall between 5mm and 10mm, sufficient mechanical strength of the fan cover can be achieved, avoiding deformation of the fan cover due to too small a distance and a decrease in ventilation efficiency due to too large a distance.

[0022] In embodiments of this disclosure, in the direction perpendicular to the axial direction, the size of a single ventilation hole on the side accounts for 15% to 30% of the size of the side of the fan shroud, and the width of the rib is between 1 / 5 and 1 / 4 of the size of a single ventilation hole in the direction perpendicular to the axial direction.

[0023] In this way, the heat dissipation effect can be improved while ensuring the strength of the fan cover. Because if the ventilation holes are small and there are too many ventilation holes, the number of ribs between the ventilation holes will also increase, which will increase the risk of turbulence, reduce ventilation efficiency and increase noise. On the other hand, although the larger size can greatly improve the heat dissipation effect, it will weaken the structural integrity and mechanical strength of the fan cover.

[0024] In embodiments of this disclosure, the size of a single ventilation hole ranges from 15mm*15mm to 25mm*25mm.

[0025] In the embodiments of this disclosure, the size of a single ventilation hole is 15mm*15mm, and the multiple ventilation holes include 3 rows*5 columns of ventilation holes or 5 rows*5 columns of ventilation holes, or the size of a single ventilation hole is 25mm*25mm, and the multiple ventilation holes include 2 rows*3 columns of ventilation holes or 3 rows*3 columns of ventilation holes.

[0026] In the embodiments of this disclosure, the bottom of the inverter housing is fitted with a base plate that is spaced apart from the bottom surface of the inverter housing by a certain distance. An air inlet is provided on the base plate at a position opposite to the window, and wind baffles are provided on both sides of the air inlet. The wind baffles are symmetrically arranged about the axial direction.

[0027] In this manner, by arranging the air inlets, airflow passing through the fan shroud windows can be directly introduced into the bottom of the inverter, acting on the heat-generating electronic components that require cooling. This avoids airflow dispersion or ineffective flow along the way, improving the effective utilization rate of the cooling airflow. Furthermore, the symmetrically arranged baffles on both sides of the air inlets prevent irregular scattering or backflow of airflow before reaching the inverter, guiding the airflow smoothly along a predetermined path until it reaches the inverter's heat source. Additionally, the symmetrical baffle arrangement effectively prevents airflow short-circuiting, ensuring that the airflow enters the bottom of the inverter housing directly with the shortest distance, highest speed, and largest flow rate, thereby greatly improving heat exchange efficiency. Because a certain gap is maintained between the base plate and the bottom surface of the inverter housing, an additional escape path for hot airflow is provided. This allows the space between the base plate and the inverter housing to be used as an auxiliary heat dissipation area, further enhancing the inverter's cooling effect.

[0028] In embodiments of this disclosure, the bottom surface of the inverter housing is provided with a plurality of heat dissipation fins extending along the axial direction or a plurality of heat dissipation fins extending in a direction perpendicular to the axial direction.

[0029] In the embodiments of this disclosure, the outer surface of the motor housing is provided with a plurality of heat dissipation ribs extending along the axial direction. The plurality of heat dissipation ribs of the motor housing include a plurality of top heat dissipation ribs disposed on the top surface of the motor housing. The plurality of top heat dissipation ribs include a central heat dissipation rib and a first heat dissipation rib group and a second heat dissipation rib group on both sides of the central heat dissipation rib. Each heat dissipation rib in the first heat dissipation rib group and the second heat dissipation rib group has an arc-shaped end near the front end of the rotating shaft. The arc-shaped shape bends in the direction away from the central heat dissipation rib.

[0030] In this way, arc-shaped guide grooves can be formed between the heat dissipation fins on the top surface of the motor housing, thereby optimizing the heat dissipation path, enhancing the directional flow of air on the heat dissipation fins, increasing the airflow speed, and thus improving the heat dissipation efficiency.

[0031] In embodiments of this disclosure, cooling airflow guided from the window to the inverter forms a first air duct, which is equivalent to a first cylindrical ventilation pipe. The minimum gap between the motor housing and the inverter housing is set to increase the first effective energy of the first air duct.

[0032] Among them, the first effective energy: Q eff1 =Q1(1-η loss1 ), where Q eff1 Q1 refers to the first effective energy, Q1 refers to the first ventilation volume of the cooling airflow discharged from the window, and η refers to the first effective energy. loss1 It is the wind speed loss rate of the first air duct, among which,

[0033]

[0034] X1: The height of the first cylindrical ventilation duct along the direction in which the cooling airflow is guided from the window to the frequency converter, wherein the height of the first cylindrical ventilation duct is equal to the minimum gap between the motor housing and the frequency converter housing;

[0035] V x1 : The axial wind speed at the height of the first cylindrical ventilation duct at the distance from the window;

[0036] V 01 : Exit wind speed at the window;

[0037] ξ1: First drag coefficient;

[0038] D e1 : The equivalent diameter of the first cylindrical ventilation duct.

[0039] In this way, without causing mutual interference between the inverter and the motor during installation and affecting the installation, the minimum gap between the motor housing and the inverter housing is reduced. This reduces the energy loss of the cooling airflow generated by the cooling fan as it is guided to the inverter through the first air duct, thereby reducing airflow loss and increasing the effective energy reaching the inverter through the first air duct, thus enhancing the heat dissipation effect.

[0040] In the embodiments of this disclosure, a plurality of top heat dissipation fins extending axially are provided on the top surface of the motor housing. The cooling airflow generated by the rotation of the cooling fan flows through the gap between the fan cover and the motor housing and through the plurality of top heat dissipation fins. A portion of the cooling airflow flowing through the plurality of top heat dissipation fins flows to the frequency converter, thereby forming a second air duct. The second air duct is equivalent to a second cylindrical ventilation duct, wherein the second effective energy of the second air duct is: Q eff2 =Q2(1-η loss2 ), where Q eff2 Q2 refers to the second effective energy, Q2 refers to the second ventilation volume, which is a part of the cooling airflow, and η refers to the second effective energy. loss2 This is the wind speed loss rate of the second air duct, where,

[0041]

[0042] X2: The height of the second cylindrical ventilation duct along a portion of the cooling airflow from the top heat dissipation fins toward the inverter;

[0043] V x2 The second axial wind speed is located at the height of the second cylindrical ventilation duct from the top heat dissipation fins.

[0044] V 02 A portion of the cooling airflow originates from the outlet air velocity of multiple top heat dissipation fins;

[0045] ξ2: Second drag coefficient;

[0046] D e2 The equivalent diameter of the second cylindrical ventilation duct.

[0047] Where, X2 = H gap -H rib ,

[0048] Among them, H gap The distance from the bottom of the inverter housing to the bottom of the top heat dissipation fins;

[0049] H rib The height of the top heat dissipation fins

[0050] The second effective energy is increased by reducing the distance from the bottom of the inverter housing to the bottom of the top heat dissipation fin or by increasing the height of the top heat dissipation fin.

[0051] In this way, without causing mutual interference between the inverter and the motor during installation, the energy loss of the cooling airflow guided to the inverter through the second air duct can be reduced by decreasing the distance from the bottom of the inverter housing to the bottom of the top heat dissipation fins or increasing the height of the top heat dissipation fins. This reduces airflow loss and increases the effective energy reaching the inverter through the second air duct, thereby improving the heat dissipation effect.

[0052] In the embodiments of this disclosure, the height of the top heat dissipation fins ranges from 10mm to 20mm, and the center-to-center distance between adjacent top heat dissipation fins is 1.2 to 1.8 times the height.

[0053] In this way, a balance can be achieved between the height and number of heat dissipation fins, thereby achieving a better heat dissipation effect. This is because if the height of the heat dissipation fins is increased, the center-to-center spacing between the heat dissipation fins needs to be increased accordingly. Increasing the center-to-center spacing between the heat dissipation fins will reduce the number of heat dissipation fins and thus reduce the heat dissipation effect.

[0054] This disclosure achieves a high-efficiency, low-cost heat dissipation solution by optimizing the heat dissipation structure of an integrated variable frequency motor. Specifically, by setting windows on the side of the fan shroud, not only is the heat dissipation problem of the frequency converter solved, but the installation of an additional fan inside the frequency converter is also avoided, reducing the overall cost. Simultaneously, by adjusting the gap between the frequency converter housing and the motor housing and optimizing the design of the heat dissipation fins, the transmission efficiency of cooling airflow is further improved, energy loss is reduced, and the heat dissipation effect of the frequency converter is enhanced. Furthermore, the arc-shaped airflow guide design of the heat dissipation fins and the layout of the windows ensure smooth airflow and reduce noise. Attached Figure Description

[0055] The accompanying drawings, which are included to provide a further understanding of this disclosure and form part of this disclosure, illustrate exemplary embodiments of the present disclosure and are used to explain the disclosure, but do not constitute an undue limitation of the disclosure. In the drawings:

[0056] Figure 1A A cross-sectional view of an integrated variable frequency motor according to a first embodiment of the present disclosure is shown.

[0057] Figure 1B Another cross-sectional view of an integrated variable frequency motor according to a first embodiment of the present disclosure is shown.

[0058] Figure 2 A perspective view of the motor in an integrated variable frequency motor according to a first embodiment of the present disclosure is shown.

[0059] Figure 3A A schematic diagram of a first design of the fan cover of the motor in an integrated variable frequency motor according to a first embodiment of the present disclosure is shown.

[0060] Figure 3B A schematic diagram of a second design of the fan cover of the motor in an integrated variable frequency motor according to a first embodiment of the present disclosure is shown.

[0061] Figure 4 A schematic diagram showing the minimum clearance between the motor housing and the inverter housing of an integrated variable frequency motor according to a first embodiment of the present disclosure is shown.

[0062] Figure 5 A cross-sectional view of an integrated variable frequency motor according to a second embodiment of the present disclosure is shown.

[0063] Figure 6 A side view of an integrated variable frequency motor according to a second embodiment of the present disclosure is shown.

[0064] Figure 7 It shows Figure 6 An enlarged diagram of the area indicated by the circle.

[0065] Figure 8 A bottom view of the inverter of an integrated variable frequency motor according to a second embodiment of the present disclosure is shown.

[0066] Figure 9 A schematic diagram showing the minimum clearance between the motor housing and the inverter housing of an integrated variable frequency motor according to a second embodiment of the present disclosure is shown.

[0067] Explanation of icon numbers:

[0068] 101 Motor Housing

[0069] 102 Shaft

[0070] 102a Front end

[0071] 102b rear end

[0072] 103 Cooling Fan

[0073] 104 Fan Cover

[0074] 104a Top Wall

[0075] 104b peripheral wall

[0076] 1041 Window

[0077] 1041h ventilation hole

[0078] 1041a Anterior outer edge

[0079] 1041b Outer Edge

[0080] 1041r Ribs

[0081] 105, 203, 303 heat dissipation fins

[0082] 1050 Top Heat Dissipation Fins

[0083] 1051 Central heat dissipation fin

[0084] 1052 First heat dissipation fin group

[0085] 1053 Second heat dissipation fin group

[0086] 200, 300 frequency converters

[0087] 201,301 Inverter Housing

[0088] 202,302 Heating Electronic Devices

[0089] 304 base plate

[0090] 305 Air Inlet

[0091] 306 Windshield. Detailed Implementation

[0092] To enable those skilled in the art to better understand the present disclosure, the technical solutions of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present disclosure, and not all embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present disclosure.

[0093] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such signals can be interchanged where appropriate so that the embodiments of this disclosure described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, for example, including a series of steps or units or processes, methods, systems, products, or devices, not necessarily limited to those explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products, or devices.

[0094] As discussed in the background section, existing integrated variable frequency motors have the following problems: In order to dissipate heat from the inverter area, heat dissipation fins are usually designed at the bottom of the inverter or an additional fan is added, which leads to low heat dissipation efficiency, potential increase in noise, and high cost; and removing the material above the fan from the fan cover will weaken the mechanical strength of the fan, making it easy for the fan to deform and affecting its protective function. Moreover, removing too much material may also cause airflow turbulence and reduce the heat dissipation effect.

[0095] Therefore, the present disclosure proposes to improve the overall system's heat dissipation performance by creating a window on the side of the motor's fan shroud opposite the inverter. This enhances airflow guidance and reduces energy loss during transmission. Furthermore, this design also considers the mechanical strength of the fan shroud, avoiding structural weakening caused by excessive openings. Thus, by introducing a window and optimizing its layout and size, the present disclosure effectively improves the heat dissipation of the inverter in the integrated unit without incurring additional costs.

[0096] Figure 1A This is a cross-sectional view of an integrated variable frequency motor according to the first embodiment of this disclosure. (See figure) Figure 1A As shown, the integrated variable frequency motor 10 includes a motor 100 and a frequency converter 200 disposed and fixed above the motor 100, thereby forming an integrated variable frequency motor.

[0097] Specifically, the motor 100 may include a motor housing 101, a rotating shaft 102 extending from the motor housing 101 in the axial direction, a cooling fan 103, and a fan shroud 104 covering the cooling fan 103. For example... Figure 1A As shown, the rotating shaft 102 may include a front end 102a and a rear end 102b, wherein the front end 102a may be a drive end and is used to connect a load device or a power transmission mechanism, and the rear end 102b may be provided with a cooling fan 103. For example, multiple blades constituting the cooling fan 103 may be mounted on the rear end 102b, and the cooling fan 103 rotates as the rotating shaft 102 rotates to generate a cooling airflow to cool the inverter 200 (e.g., the heat-generating electronic components in the inverter), which will be described later, and to cool the motor 100 itself.

[0098] like Figure 1AAs shown, the frequency converter 200 can be disposed on the radial side of the motor housing 101 above the motor housing 101 and may include the frequency converter housing 201 and at least one heat-generating electronic device 202 disposed within the frequency converter housing 201. The motor housing 101 serves as the base of the integrated variable frequency motor 10, and the bottom of the frequency converter housing 201 is fixedly connected to the top of the motor housing 101. For example, a reliable mechanical and electrical connection is formed between the bottom of the frequency converter housing 201 and the motor housing 100 through fasteners and connectors. Since the mechanical and electrical connection between the bottom of the frequency converter housing 201 and the top of the motor housing 100 is not an improvement of the prior art in this disclosure, it will not be described in detail here. Those skilled in the art can easily realize the mechanical and electrical connection between the two based on the frequency converter and motor actually used.

[0099] The overall structure of the integrated variable frequency motor disclosed herein has been described above. The following describes in detail the construction of the specific components of the integrated variable frequency motor.

[0100] like Figure 1A and Figure 2 As shown, the outer surface of the motor housing 101 is provided with a plurality of heat dissipation ribs 105 extending along the axial direction. The plurality of heat dissipation ribs 105 include a plurality of top heat dissipation ribs 1050 disposed on the top surface of the motor housing 101. The plurality of top heat dissipation ribs 1050 may include a central heat dissipation rib 1051 and a first heat dissipation rib group 1052 and a second heat dissipation rib group 1053 on both sides of the central heat dissipation rib 1051. Each heat dissipation rib in the first heat dissipation rib group 1052 and the second heat dissipation rib group 1053 has an arc-shaped end near the front end 102a. The arc shape bends in a direction away from the central heat dissipation rib 1051, thereby forming an arc-shaped guide groove at the tail of each heat dissipation rib in the first heat dissipation rib group 1052 and the second heat dissipation rib group 1053, thereby increasing the airflow velocity flowing out from the guide groove between the heat dissipation ribs and enhancing heat dissipation.

[0101] like Figure 1A and Figure 1B As shown, the bottom surface of the inverter housing 201 may be provided with a plurality of heat dissipation fins 203 extending in a direction perpendicular to the axial direction. Although not shown, as an alternative embodiment, the plurality of heat dissipation fins 203 may extend in the axial direction on the bottom surface of the inverter housing 201. Thus, the inverter 200 can be cooled by heat exchange between the heat dissipation fins provided on the bottom surface of the inverter housing 201 and the airflow.

[0102] In an embodiment where multiple heat dissipation fins 203 extend axially along the bottom surface of the inverter housing 201, the multiple heat dissipation fins 203 can be aligned and aligned with multiple top heat dissipation fins 1050 to form a flow channel through which airflow passes, thereby enhancing heat dissipation.

[0103] like Figure 1A and Figure 2 As shown, according to the present disclosure, a window 1041 can be provided on the side of the fan cover 104 opposite to the inverter 200. The window 1041 can be located directly below the inverter housing 201 and guide the cooling airflow generated by the rotation of the cooling fan 103 to the inverter 200 to cool at least one heat-generating electronic device 202.

[0104] In detail, the fan cover 104 according to this disclosure may include a top wall 104a having a plurality of openings for allowing air to flow through, and an outer peripheral wall 104b that together with the top wall 104a defines a cavity, wherein a cooling fan 103 is housed in the cavity, and a window 1041 is formed on the side of the outer peripheral wall 104b opposite to the inverter 200.

[0105] The cooling airflow generated by the rotating cooling fan 103, besides being guided through window 1041 to the inverter 200 to cool at least one heat-generating electronic device 202, can also be used to cool the motor 100. Specifically, as... Figure 2 As shown, there is a gap between the outer peripheral wall 104b and the motor housing 101. Therefore, the rotation of the cooling fan 103 draws air in from the multiple openings of the top wall 104a of the fan cover 104, thereby generating a cooling airflow. The generated cooling airflow flows through the gap between the outer peripheral wall 104b and the motor housing 101 and passes through the heat dissipation fins 105 provided on the outer surface of the motor housing 101, and performs convective heat exchange with the surface of the motor 100, thereby carrying away the heat of the motor 100 and thus achieving cooling of the motor 100.

[0106] Further as Figure 1A and Figure 2 As shown, window 1041 can be shaped as an array of ventilation holes, which may include a plurality of ventilation holes 1041h forming a mesh structure and an outer edge surrounding the mesh structure, wherein ribs 1041r are provided between adjacent ventilation holes 1041h. The outer edge may include a front outer edge 1041a near the front end portion 102a of the pivot 102 and a rear outer edge 1041b away from the front end portion 102a of the pivot 102.

[0107] Although the accompanying drawings of embodiments of this disclosure show that window 1041 is shaped as an array of vents, window 1041 may include a single opening rather than a grid-like window in the form of an array of vents.

[0108] like Figure 1A and Figure 2As shown, the end face 201a of the inverter housing 201 located on the rear end 102b of the shaft 102 is further away from the front end 102a of the shaft 102 in the axial direction of the motor housing 101 than the rear outer edge 1041b of the window 1041. Therefore, the inverter housing 201 extends axially toward the rear end 102b of the shaft 102 beyond the window 1041, thus completely covering the window 1041. Furthermore, the total length and width of the window 1041 are greater than the length and width occupied by the heat-generating electronic components of the inverter 200, thereby enabling more effective cooling of the heat-generating electronic components.

[0109] like Figure 2 As shown, the shape of the grid structure of window 1041 is shown as rectangular, but this disclosure is not limited to this. As long as the heat dissipation of the frequency converter can be achieved so that the temperature of the frequency converter in the high-efficiency operating state is within a safe range and the mechanical strength of the fan cover is maintained to prevent deformation, the shape of the grid structure can also be designed as square, circle or polygon.

[0110] The inventors of this disclosure conducted experiments on ventilation hole arrays for windows of various shapes. The experiments showed that after the ventilation hole array of a circular window was cut, the gaps between the air ducts formed by the individual ventilation holes were irregular, causing airflow loss and turbulence. When the diameter of the ventilation hole array of a circular window and the side length of the ventilation hole array of a square window were the same, the ventilation area of ​​the ventilation hole array of the square window was larger and the heat dissipation effect was better. Compared to a rectangle within a square, a square has four sides of equal length and is more stable in strength. Therefore, it is preferable to design the ventilation hole array of the window as a square.

[0111] Furthermore, in their research on designing a ventilation hole array for heat dissipation of the frequency converter, the inventors of this disclosure discovered that a larger opening ratio of the ventilation hole array is not necessarily better. An excessively large opening ratio can cause fan shroud deformation, while an excessively small opening ratio will affect the heat dissipation effect of the frequency converter. Therefore, it is necessary to design an optimal ventilation hole array while ensuring effective heat dissipation of the frequency converter and the strength of the fan shroud. Specifically, the research found that the parameters affecting the lateral strength of the ventilation hole array with windows on the fan shroud include: the width of a single ventilation hole, the width of the ribs between ventilation holes, the distance from the first row of ventilation holes to the edge of the fan shroud, and the thickness of the fan shroud itself.

[0112] The width design of a single ventilation hole must take into account the overall airflow requirements. If the ventilation hole is too small, the number of ventilation holes needs to be increased, but this will cause turbulence problems; if the ventilation hole is too large, it will affect the strength of the fan shroud. According to research results, the width of a single ventilation hole is 15% to 30% of the width of the side of the fan shroud, which can achieve effective heat dissipation of the frequency converter while maintaining the strength of the fan shroud without deformation.

[0113] In addition, to ensure the strength of the side where the window is located, the width of the rib is between 1 / 5 and 1 / 4 of the width of a single ventilation hole. When the width of the ventilation hole increases, the width of the rib also needs to be increased accordingly to ensure strength.

[0114] Furthermore, since the mounting openings formed by the edges of the fan shroud's outer perimeter are typically large and prone to deformation, the distance between the edge of the fan shroud's outer perimeter and the front outer edge of the mesh structure needs to be considered. If the width of a single ventilation opening accounts for 15% of the side width, the distance must be at least 5mm to reduce fan shroud deformation. If the size of the ventilation opening increases, and the width of a single ventilation opening accounts for 30% of the side width, the distance must be at least 10mm to reduce fan shroud deformation.

[0115] Therefore, according to this disclosure, the distance between the edge of the outer peripheral wall and the front outer edge of the mesh structure can be set between 5 mm and 10 mm.

[0116] In addition, considering the material properties and molding process of the fan cover itself, the thickness of the fan cover is designed to be 1 to 1.5 mm.

[0117] Regarding the design of the ventilation hole array of the fan shroud window, the mesh structure disclosed herein can be configured such that multiple ventilation holes are arranged along the axial direction and perpendicular to the axial direction to ensure uniform airflow distribution. Furthermore, the number of ventilation holes depends on the opening ratio of the ventilation hole array on the side of the fan shroud 104 and the size of each individual ventilation hole.

[0118] Specifically, the following solutions are provided in this disclosure.

[0119] As the first design option, such as Figure 3A As shown, where Figure 3A A first design scheme for the ventilation hole array of the window 1041 of the fan cover 104 is shown. In the first design scheme, the overall thickness of the fan cover 104 is 1mm, the ventilation hole array of the window 1041 may include 6 ventilation holes, the size of a single ventilation hole is 25mm*25mm, and the width of the ribs between the ventilation holes is one-fifth of the width of a single ventilation hole, which is 5mm.

[0120] Based on the formula:

[0121] Wherein: S 孔 Total area of ​​openings = Area of ​​a single ventilation opening * Number of openings;

[0122] S 总 The side surface area of ​​fan shroud 104 is approximately 9375 mm². 2 Therefore, we can conclude that... Figure 3AThe ventilation hole array of window 1041 has an opening ratio of 40%, and the distance between the edge of the outer peripheral wall 104b and the front outer edge of the mesh structure is 8 mm.

[0123] As a variation of the first design, each ventilation hole measures 25mm x 25mm, and the ventilation hole array of window 1041 can include 3 rows x 3 columns of ventilation holes, resulting in an opening ratio of 60%. The distance between the edge of the outer peripheral wall 104b and the front outer edge of the mesh structure is 8mm. This design achieves better heat dissipation than the first design while maintaining acceptable strength of the fan shroud 104.

[0124] As a second design option, such as Figure 3B As shown, where Figure 3B A second design scheme for the ventilation hole array of the window 1041 of the fan cover 104 is shown. In the second design scheme, the overall thickness of the fan cover 104 is 1mm, and the ventilation hole array of the window 1041 may include 3 rows * 5 columns of ventilation holes, that is, 15 ventilation holes. The size of a single ventilation hole is 15mm * 15mm, and the width of the ribs between the ventilation holes is one-fifth of the width of a single ventilation opening, that is, 3mm.

[0125] Based on the above formula (1), we can obtain Figure 3B The ventilation hole array of the window has an opening ratio of 36%, of which the side area is approximately 9375 mm². 2 Additionally, as an example, the distance between the edge of the outer peripheral wall 104b and the front outer edge of the mesh structure is 5 mm.

[0126] In the second design, the area of ​​the ventilation hole array in window 1041 is smaller than that in the first design, and the size of each individual ventilation hole is smaller than that in the first design, thus reducing the risk of gas turbulence in the first design. Furthermore, since the ventilation hole array in the first design has a larger area and better heat dissipation, increasing the effective cross-sectional area of ​​the ventilation hole array will improve the heat dissipation effect.

[0127] As a variation of the second design, the size of a single ventilation hole is 15mm*15mm, and the ventilation hole array of the window can include 5 rows*5 columns of ventilation holes, resulting in an opening ratio of 60% according to formula (1). The rib width between the ventilation holes is one-fifth the width of a single ventilation opening, which is 3mm. The distance between the edge of the outer peripheral wall 104b and the front outer edge of the mesh structure is 5mm. This design can achieve better heat dissipation than the second design.

[0128] Furthermore, the inventors of this disclosure have also discovered that the minimum clearance Gmin between the motor housing 101 and the inverter housing 201 (e.g., Figure 4 (As shown) This affects the energy loss of airflow transmitted from the ventilation hole array of window 1041 to the frequency converter. That is, the larger the minimum gap Gmin between the motor housing 101 and the frequency converter housing 201, the greater the loss of airflow transmitted to the frequency converter, and the worse the heat dissipation effect. Therefore, in this disclosure, the minimum gap Gmin between the motor housing 101 and the frequency converter housing 201 is set such that the energy loss of the cooling airflow generated by the rotation of the cooling fan is reduced on the path guided to the frequency converter through window 1041, while maintaining that the motor housing 101 and the frequency converter housing 201 can be assembled together.

[0129] Specifically, such as Figure 1B As shown, the cooling airflow guided from window 1041 to inverter 200 forms a first air duct 40, which is equivalent to a first cylindrical ventilation duct. The minimum gap Gmin between the motor housing 101 and inverter housing 201 is set to increase the first effective energy of the cooling airflow generated by the rotation of cooling fan 103, which is then guided to inverter 200 through window 1041; that is, to increase the first effective energy of the first air duct 40.

[0130] Among them, the first effective energy: Q eff1 =Q1(1-η loss1 ), where Q eff1 Q1 refers to the first effective energy, Q1 refers to the first ventilation volume of the cooling airflow discharged from window 1041, and η refers to the first effective energy. loss1 This is the wind speed loss rate of the first air duct 40, where,

[0131]

[0132] X1: The height of the first cylindrical ventilation duct along the direction from window 1041 toward the inverter 200 along the cooling airflow, wherein the height of the first cylindrical ventilation duct is equal to the minimum gap Gmin between the motor housing 101 and the inverter housing 201.

[0133] V x1 The axial wind speed at the height of the first cylindrical ventilation duct, 1041 meters from the window;

[0134] V 01 : Outlet wind speed of window 1041;

[0135] ξ1: First drag coefficient;

[0136] D e1 : The equivalent diameter of the first cylindrical ventilation duct.

[0137] In this paper, the first drag coefficient ξ1 can take values ​​from 0.01 to 0.05.

[0138] As can be seen from the above formula, the smaller the minimum gap Gmin (equal to X1) between the motor housing 101 and the inverter housing 201, the smaller the energy loss, and thus the greater the first effective energy reaching the inverter through the first air duct 40. However, since the inverter and the motor need to be assembled as one unit, the setting of the minimum gap between the motor housing and the inverter housing also needs to consider whether the bottom of the inverter housing will interfere with the motor components, such as the end cover mounting bracket, the heat dissipation fins on the top surface of the motor housing, the fan cover, etc.; the installation gap requirements of the motor and inverter lead wire connectors; the dimensional tolerance of the motor frame outlet, the compression of the sealing gasket, etc.

[0139] Therefore, while meeting the assembly requirements of the frequency converter and motor, the minimum gap between the frequency converter housing and the motor housing can be reduced to between 6-10mm, thereby reducing energy loss and improving heat dissipation. As mentioned above, the cooling airflow generated by the rotation of the motor's cooling fan reaches the bottom of the frequency converter through the first air duct formed by the window. The reduced bottom gap decreases the energy loss of the cooling airflow and improves the heat dissipation effect.

[0140] Additionally, as described above, a plurality of top cooling fins 1050 extending axially are provided on the top surface of the motor housing 101. The cooling airflow generated by the rotation of the cooling fan 103 flows through the gap between the fan cover 104 and the motor housing 101 and passes through the plurality of top cooling fins 1050. A portion of the cooling airflow flowing through the plurality of top cooling fins 1050 flows to the frequency converter 200, thereby forming a second air duct 50 (e.g., Figure 1B As shown), the second air duct 50 is equivalent to a second cylindrical ventilation duct, wherein the second effective energy of the second air duct 50 is: Q eff2 =Q2(1-η loss2 ), where Q eff2 Q2 refers to the second effective energy, Q2 refers to the second ventilation volume, which is a part of the cooling airflow, and η refers to the second effective energy. loss2 This is the wind speed loss rate of the second air duct 50, where,

[0141]

[0142] X2: The height of the second cylindrical ventilation duct along a portion of the cooling airflow from the top heat dissipation fins toward the inverter;

[0143] V x2 The second axial wind speed is located at the height of the second cylindrical ventilation duct from the top heat dissipation fins.

[0144] V 02 A portion of the cooling airflow originates from the outlet air velocity of multiple top heat dissipation fins;

[0145] ξ2: Second drag coefficient;

[0146] D e2 The equivalent diameter of the second cylindrical ventilation duct.

[0147] Where, X2 = H gap -H rib ,

[0148] Among them, H gap The distance from the bottom of the inverter housing 201 to the bottom of the top heat dissipation fin 1050;

[0149] H rib The top heat dissipation fins are 1050mm high.

[0150] The second effective energy is increased by reducing the distance from the bottom of the inverter housing 201 to the bottom of the top heat dissipation fin 1050 or by increasing the height of the top heat dissipation fin 1050.

[0151] In this paper, the second drag coefficient ξ2 can take values ​​from 0.01 to 0.05.

[0152] Therefore, without causing mutual interference between the inverter and the motor during installation, the height of the top heat dissipation fins can be increased to reduce energy loss along the path of the cooling airflow from the top heat dissipation fins 1050 to the inverter 200, thereby reducing airflow loss and increasing the second effective energy of the second air duct 50, thus enhancing the heat dissipation effect.

[0153] In this disclosure, the height of the top heat dissipation fins of the motor is set between 10 and 20 mm to reduce energy loss, while the height of other heat dissipation fins on the sides of the motor is maintained at 6 to 8 mm to meet installation requirements. However, the height of the other heat dissipation fins on the sides of the motor is not limited to this; provided the installation requirements are met, the height of the other heat dissipation fins on the sides of the motor can be set higher to enhance heat dissipation. Furthermore, to avoid airflow short-circuiting, the center-to-center distance between adjacent top heat dissipation fins of the motor is 1.2 to 1.8 times their height. Preferably, the center-to-center distance between other adjacent heat dissipation fins of the motor can also be set to 1.2 to 1.8 times their fin height.

[0154] In one experimental example disclosed herein, the height of the top heat dissipation fins was designed to be 10.5 mm, the center-to-center distance between adjacent heat dissipation fins was 13 mm, and the number of top heat dissipation fins was 11. Simulation results showed that this experimental example achieved good heat dissipation performance. A larger height of the top heat dissipation fins results in a larger center-to-center distance, which may affect the number of heat dissipation fins and thus the heat dissipation effect. Therefore, a center-to-center distance between adjacent top heat dissipation fins that is 1.2 to 1.8 times their height can achieve a better heat dissipation effect.

[0155] Therefore, a balance needs to be struck between the height and number of heat dissipation fins to achieve better heat dissipation. Increasing the height of the fins requires increasing the center-to-center spacing between them, which reduces the number of fins needed and thus decreases the overall heat dissipation effect.

[0156] Figure 5 This is a cross-sectional view of an integrated variable frequency motor according to a second embodiment of the present disclosure. The external contour of the inverter in the integrated variable frequency motor of the second embodiment differs from the external contour of the inverter in the first embodiment of the present disclosure. This disclosure demonstrates an integrated variable frequency motor including inverters with different external contours to help those skilled in the art understand that the aspects of this disclosure concerning improvements to inverter heat dissipation in integrated variable frequency motors are applicable to various types and models of inverters. In the second embodiment, other aspects of improvements to inverter heat dissipation in integrated variable frequency motors are shown. These other improvements are described in detail below, and the technical improvements described above with respect to the first embodiment of the present disclosure are also applicable to the integrated variable frequency motor of the second embodiment, and will not be repeated here.

[0157] like Figure 5 As shown, the integrated variable frequency motor 20 includes a motor 100 and a frequency converter 300 disposed and fixed above the motor 100, thereby forming an integrated variable frequency motor 20 with the motor 100 and the frequency converter 300.

[0158] Similarly, the motor 100 may include a motor housing 101, a shaft 102 extending axially from the motor housing 101, a cooling fan 103, and a fan shroud 104 covering the cooling fan 103. The cooling fan 103 rotates with the shaft 102 to generate cooling airflow to cool the inverter 300 (e.g., the heat-generating electronic components in the inverter) and the motor 100 itself.

[0159] The frequency converter 300 may be disposed on the radial side of the motor housing 101 above the motor housing 101 and may include the frequency converter housing 301 and at least one heat-generating electronic device 302 disposed within the frequency converter housing 301.

[0160] like Figure 5 As shown, a window 1041 is provided on the side of the fan shroud 104 opposite to the inverter 300. The window 1041 is located directly below the inverter housing 301 and guides the cooling airflow generated by the rotation of the cooling fan 103 to the inverter 300 to cool at least one heat-generating electronic device 302. The structure, shape, and layout of the window 1041 in the second embodiment are the same as those in the first embodiment, and will not be described again here.

[0161] Furthermore, such as Figures 6 to 8As shown, in the second embodiment, a base plate 304, spaced apart from the bottom surface of the inverter housing 301, is fitted to the bottom of the inverter housing 301. An air inlet 305 is provided on the base plate 304 opposite to the window 1041. Baffles 306 are provided on both sides of the air inlet 305, symmetrically arranged about the axial direction. The air inlet 305, aligned with the window 1041, ensures that cooling airflow can directly and efficiently enter the inverter housing 301 for concentrated cooling of the heat source. Simultaneously, the baffles 306 on both sides of the air inlet 305 prevent unnecessary turbulence and energy loss during airflow entry, enhancing ventilation into the inverter housing 301. Furthermore, the gap between the base plate 304 and the bottom surface of the inverter housing 301 provides an additional escape path for hot airflow. The heat-carrying airflow can effectively diffuse out through this gap, further enhancing the inverter's cooling effect.

[0162] In addition, such as Figure 8 As shown, a heat dissipation fin 303 extending along the axial direction can be provided at the bottom of the inverter housing 301, directly opposite the air inlet 305. The cooling airflow entering through the air inlet 305 can also exchange heat with the heat dissipation fin 303, thereby enhancing the heat dissipation effect of the inverter.

[0163] In the second embodiment of this disclosure, while maintaining the ability of the motor housing 101 and the inverter housing 201 to be assembled together, the energy loss along the path of the cooling airflow generated by the cooling fan rotation, guided to the inverter through the window 1041, is reduced by decreasing the minimum gap between the motor housing 101 and the inverter housing 301, thereby increasing the first effective energy of the first air duct 40 and improving the heat dissipation effect on the heat-generating electronic components of the inverter. In the second embodiment of this disclosure, the minimum gap Gmin between the motor housing 101 and the inverter housing 301 is as follows: Figure 9 As indicated. Since the principle and method of increasing the first effective energy of the cooling airflow generated by the rotation of the cooling fan by reducing the minimum gap between the motor housing 101 and the inverter housing 301 to guide the cooling airflow to the inverter through the window 1041 are similar to those of the first embodiment, they will not be described again here.

[0164] In the second embodiment of this disclosure, while ensuring that the motor housing 101 and the inverter housing 201 can be assembled together, the energy loss of the second air duct 50 can be reduced by decreasing the distance from the bottom of the inverter housing 201 to the bottom of the top heat dissipation fin 1050 of the motor 100 or by increasing the height of the top heat dissipation fin, thereby increasing the second effective energy of the second air duct 50 and improving the heat dissipation effect on the heat-generating electronic components of the inverter. Since the principle and method of reducing the distance from the bottom of the inverter housing 201 to the bottom of the top heat dissipation fin or increasing the height of the top heat dissipation fin to reduce the energy loss of the second air duct 50 and increase the second effective energy of the second air duct 50 are similar to those in the first embodiment, they will not be repeated here.

[0165] Please note that while the implementation described herein provides a heat dissipation solution, in practical applications, certain parameters such as the size of the ventilation holes, the number and location of the heat dissipation fins, and the minimum clearance between the inverter and the motor housing may need to be adjusted according to specific installation constraints, performance requirements, etc.

[0166] The integrated variable frequency motor disclosed herein has at least the following advantages over the prior art: no additional fan is needed on the inverter adapter board, reducing the cost of the integrated unit; and the new fan cover improves the inverter's heat dissipation while also ensuring the strength of the fan cover itself.

[0167] In the above embodiments of this disclosure, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0168] In the several embodiments provided in this disclosure, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection between the units shown or discussed may be through some interfaces, and the indirect coupling or communication connection between units may be electrical or other forms.

[0169] The above are merely preferred embodiments of this disclosure. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this disclosure, and these improvements and modifications should also be considered within the scope of protection of this disclosure.

Claims

1. An integrated variable frequency motor, characterized in that, The integrated variable frequency motor includes: An electric motor (100) comprising a motor housing (101) and a rotating shaft (102) extending axially from the motor housing (101), the rotating shaft (102) comprising a front end and a rear end, the rear end of the rotating shaft (102) being provided with a cooling fan (103), the cooling fan (103) being provided with a fan cover (104); and A frequency converter (200) is disposed radially above the motor housing (101). The frequency converter (200) includes a frequency converter housing (201) and at least one heat-generating electronic device (202) disposed within the frequency converter housing (201). The bottom of the frequency converter housing (201) is opposite to and fixed together with the top of the motor housing (101). The fan shroud (104) includes a top wall (104a) with multiple openings and an outer peripheral wall (104b) that together with the top wall (104a) defines a cavity. The cooling fan (103) is housed in the cavity. A window (1041) is provided on the side of the outer peripheral wall (104b) opposite to the inverter (200). The window (1041) is located directly below the inverter housing (201) and guides the cooling airflow generated by the rotation of the cooling fan (103) toward the inverter (200) to cool the at least one heat-generating electronic device (202). There is a certain distance between the edge of the outer peripheral wall (104b) and the outer edge of the window (1041) near the edge of the outer peripheral wall (104b).

2. The integrated variable frequency motor according to claim 1, characterized in that, The inverter housing (201) extends along the axial direction toward the rear end of the shaft (102) beyond the window (1041).

3. The integrated variable frequency motor according to claim 1, characterized in that, The window (1041) has a front outer edge near the front end and a rear outer edge away from the front end. The end face (201a) of the inverter housing (201) located on the rear end of the shaft is further away from the front end of the shaft (102) in the axial direction of the motor housing (101) than the rear outer edge of the window (1041).

4. The integrated variable frequency motor according to claim 1, characterized in that, The window (1041) is shaped as an array of ventilation holes, the array of ventilation holes including a plurality of ventilation holes forming a grid structure and an outer edge surrounding the grid structure, wherein ribs are provided between adjacent ventilation holes in the plurality of ventilation holes.

5. The integrated variable frequency motor according to claim 4, characterized in that, The shape of the grid structure includes squares, rectangles, circles, or polygons.

6. The integrated variable frequency motor according to claim 5, characterized in that, The mesh structure is square or rectangular in shape and the ventilation holes are square in shape. The plurality of ventilation holes are arranged along the axial direction and in a direction perpendicular to the axial direction. The number of the plurality of ventilation holes depends on the opening ratio of the ventilation hole array on the side and the size of the individual ventilation holes.

7. The integrated variable frequency motor according to claim 1, characterized in that, The distance between the edge of the outer peripheral wall (104b) and the outer edge of the window (1041) near the edge of the outer peripheral wall (104b) is between 5mm and 10mm.

8. The integrated variable frequency motor according to claim 6, characterized in that, In the direction perpendicular to the axial direction, the size of a single ventilation hole on the side is 15% to 30% of the size of the side of the fan shroud (104), and the width of the rib is between 1 / 5 and 1 / 4 of the size of a single ventilation hole in the direction perpendicular to the axial direction.

9. The integrated variable frequency motor according to claim 6, characterized in that, The size range of a single ventilation hole is from 15mm*15mm to 25mm*25mm.

10. The integrated variable frequency motor according to claim 9, characterized in that, The size of a single ventilation hole is 15mm*15mm, and the plurality of ventilation holes includes 3 rows*5 columns of ventilation holes or 5 rows*5 columns of ventilation holes, or the size of a single ventilation hole is 25mm*25mm, and the plurality of ventilation holes includes 2 rows*3 columns of ventilation holes or 3 rows*3 columns of ventilation holes.

11. The integrated variable frequency motor according to claim 1, characterized in that, The bottom of the inverter housing (201) is fitted with a base plate that is spaced apart from the bottom surface of the inverter housing (201). An air inlet is provided on the base plate at a position opposite to the window (1041). Wind baffles are provided on both sides of the air inlet, and the wind baffles are symmetrically arranged about the axial direction.

12. The integrated variable frequency motor according to claim 11, characterized in that, The bottom surface of the inverter housing (201) is provided with a plurality of heat dissipation fins extending along the axial direction or a plurality of heat dissipation fins extending in a direction perpendicular to the axial direction.

13. The integrated variable frequency motor according to any one of claims 1-12, characterized in that, The outer surface of the motor housing (101) is provided with a plurality of heat dissipation ribs extending along the axial direction. The plurality of heat dissipation ribs of the motor housing (101) include a plurality of top heat dissipation ribs provided on the top surface of the motor housing (101). The plurality of top heat dissipation ribs include a central heat dissipation rib and a first heat dissipation rib group and a second heat dissipation rib group on both sides of the central heat dissipation rib. Each heat dissipation rib in the first heat dissipation rib group and the second heat dissipation rib group has an arc-shaped end near the front end of the rotating shaft (102). The arc-shaped shape is bent in a direction away from the central heat dissipation rib.

14. The integrated variable frequency motor according to any one of claims 1-12, characterized in that, The cooling airflow guided from the window (1041) to the frequency converter (200) forms a first air duct (40), which is equivalent to a first cylindrical ventilation duct. The minimum gap between the motor housing (101) and the frequency converter housing (201) is set to increase the first effective energy of the first air duct (40). Wherein, the first effective energy: Q eff1 =Q1(1-η loss1 ), where Q eff1 Q1 refers to the first effective energy, Q1 refers to the first ventilation volume of the cooling airflow discharged from the window (1041), and η refers to the first effective energy. loss1 It is the wind speed loss rate of the first air duct, where, X1: The height of the first cylindrical ventilation duct along the direction from the window (1041) to the inverter (200) along the cooling airflow, wherein the height of the first cylindrical ventilation duct is equal to the minimum gap between the motor housing (101) and the inverter housing (201); V x1 The axial wind speed at a distance of the window (1041) from the height of the first cylindrical ventilation duct; V 01 The outlet wind speed of the window (1041); ξ1: First drag coefficient; D e1 : The equivalent diameter of the first cylindrical ventilation duct.

15. The integrated variable frequency motor according to claim 14, characterized in that, The top surface of the motor housing (101) is provided with a plurality of top heat dissipation fins extending along the axial direction. The cooling airflow generated by the rotation of the cooling fan (103) flows through the plurality of top heat dissipation fins through the gap between the fan cover (104) and the motor housing (101). A portion of the cooling airflow flowing through the plurality of top heat dissipation fins flows to the frequency converter, thereby forming a second air duct (50). The second air duct (50) is equivalent to a second cylindrical ventilation duct. The second effective energy of the second air duct (50) is: Q eff2 =Q2(1-η loss2 ), where Q eff2 Q2 refers to the second effective energy, Q2 refers to the second ventilation volume of the portion of the cooling airflow, and η loss2 It is the wind speed loss rate of the second air duct (50), where, X2: The height of the second cylindrical ventilation duct in the direction from the top heat dissipation fins to the frequency converter along the portion of the cooling airflow; V x2 The second axial wind speed is located at the height of the second cylindrical ventilation duct from the top heat dissipation fin. V 02 The portion of the cooling airflow has an outlet velocity from the plurality of top heat dissipation fins; ξ2: Second drag coefficient; D e2 The equivalent diameter of the second cylindrical ventilation duct. Where, X2 = H gap -H rib , Among them, H gap The distance from the bottom of the inverter housing (201) to the bottom of the top heat dissipation fin; H rib The height of the top heat dissipation fins, The second effective energy is increased by reducing the distance from the bottom of the inverter housing (201) to the bottom of the top heat dissipation fin or by increasing the height of the top heat dissipation fin.

16. The integrated variable frequency motor according to claim 15, characterized in that, The height of the top heat dissipation ribs ranges from 10mm to 20mm, and the center-to-center distance between adjacent top heat dissipation ribs is 1.2 to 1.8 times the height.

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