Variable frequency motor

Abstract

This utility model provides a variable frequency motor, which includes a main motor, a cooling housing, a cooling fan, a mounting plate, a fan motor, and at least one auxiliary plate. The cooling housing is connected to the main motor and includes an inner cavity, an air inlet, an air outlet, and a mounting port. The air outlet is connected to the heat-dissipating part of the main motor. The cooling fan is housed in the inner cavity of the cooling housing and guides cool air from the air inlet to the air outlet. The mounting plate has a first clearance opening corresponding to the mounting port and is connected to the cooling housing. The inner diameter of the first clearance opening is smaller than the inner diameter of the mounting port. The fan motor is connected to the cooling housing, and the output shaft of the fan motor is drivenly connected to the cooling fan. The auxiliary plate and the mounting plate are detachably connected and parallel to each other. The auxiliary plate has a second clearance opening corresponding to the first clearance opening, which is used to avoid the fan motor. This solution can meet various resonance avoidance requirements by replacing or removing the auxiliary plate.

Description

Technical Field

[0001] This application relates to the field of electric motor equipment technology, and in particular to a variable frequency motor. Background Technology

[0002] During the operation of variable frequency motors, especially at low speeds, the motor's self-heating capacity is prone to significant decrease, and the temperature rise of the windings can affect the safety and lifespan of the equipment. To address this challenge, the industry generally adopts an independently powered external cooling system for forced ventilation cooling. This external cooling system specifically uses an independent, low-power cooling motor to drive an external fan, which then provides air cooling for the main motor.

[0003] However, when the natural frequency of the external cooling system approaches the rotational excitation frequency (RPM) of the cooling motor, it will trigger a strong mechanical resonance phenomenon. This resonance phenomenon can lead to problems such as the cooling motor failing to work properly, abnormal vibration of the external fan structure, excessive noise, and bearing overload.

[0004] The determinacy of the natural frequency of an external cooling system is influenced by multiple coupling factors, such as the motor housing material, the rigidity of the fan bracket, the need to adapt to different power supply systems, and explosion-proof requirements. Currently, a customized solution strategy is adopted, that is, a separate adjustment scheme is set for each specific configuration (such as a 60Hz explosion-proof aluminum shell motor + a specific mounting bracket). For example, by adjusting the structural rigidity, adding counterweights, or modifying the installation method, the natural frequency of the external cooling system is made to avoid the motor's operating frequency range (usually requiring a speed separation margin of more than 20%). However, the customized solution strategy has the problem that every time the motor specifications or mounting structure is changed, the frequency avoidance design must be repeated. The customized solution cannot adapt to the flexible matching requirements of multiple component specifications, and frequent structural iterations drive up R&D and manufacturing costs.

[0005] Therefore, there is an urgent need for a vibration suppression solution with broad-spectrum adaptability to effectively avoid the resonance risk that may occur in external cooling systems of different specifications, and to reduce costs while meeting flexibility requirements. Utility Model Content

[0006] To address the aforementioned technical problems, this application provides a variable frequency motor.

[0007] This application provides a variable frequency motor, the variable frequency motor comprising:

[0008] The main motor is used to provide power output;

[0009] A cooling cover is connected to the main motor. The cooling cover includes an inner cavity, an air inlet, an air outlet, and a mounting port. The air outlet is connected to the heat dissipation part of the main motor.

[0010] A cooling fan is housed in the inner cavity of the cooling cover and can enter and exit the inner cavity through the mounting port. The cooling fan is used to guide cold air from the air inlet to the air outlet and blow the cold air towards the heat dissipation part of the main motor.

[0011] The mounting plate is connected to the outer surface of the cooling cover and has a first clearance opening. The first clearance opening and the mounting opening are connected in correspondence. The inner diameter of the first clearance opening is smaller than the inner diameter of the mounting opening.

[0012] A fan motor is connected to the outer surface of the cooling housing. The output shaft of the fan motor passes through the first clearance opening and the mounting opening and extends into the inner cavity of the cooling housing, and is connected to the cooling fan in a drive connection.

[0013] At least one additional plate is detachably connected to the outer surface of the mounting plate and is parallel to the mounting plate. The additional plate has a second clearance opening corresponding to the first clearance opening, the second clearance opening being used to avoid the fan motor.

[0014] In one alternative embodiment, the outer contour of the mounting plate and the outer contour of the additional plate are the same, and their outer contour dimensions are the same.

[0015] In an optional embodiment, the additional plate includes a first part and a second part that are separated from each other. The first part includes a first notch, and the second part includes a second notch. The first part is used to connect with one half of the mounting plate, and the second part is used to connect with the other half of the mounting plate. When both the first part and the second part are connected to the mounting plate, the first part and the second part abut to form a second clearance formed by the first notch and the second notch.

[0016] In one optional embodiment, the variable frequency motor further includes a plurality of first connectors, and the mounting plate includes a plurality of first mounting holes. The first connectors pass through the first mounting holes and are detachably connected to the cooling cover. The plurality of first mounting holes are distributed at intervals around the mounting opening.

[0017] In one optional embodiment, the additional plate includes a plurality of second mounting holes, which correspond to the first mounting holes, and the first connector passes through the second mounting holes and the first mounting holes in sequence before being connected to the cooling cover.

[0018] In one optional embodiment, the variable frequency motor further includes a plurality of second connectors, and the additional plate further includes a plurality of third mounting holes, which are spaced apart around the second clearance opening; the second connectors pass through the third mounting holes and are detachably connected to the mounting plate, and the orthographic projection of the third mounting holes toward the mounting plate is located within the range of the mounting opening and is spaced apart around the first clearance opening of the mounting plate.

[0019] In one optional embodiment, the variable frequency motor further includes a plurality of third connecting members, the fan motor includes a connecting flange, the inner diameter of the second clearance opening of the auxiliary plate is larger than the outer diameter of the connecting flange, the connecting flange is provided with a plurality of fourth mounting holes, and the third connecting members pass through the fourth mounting holes and are connected to the mounting plate.

[0020] In one alternative embodiment, the difference between the inner diameter of the second clearance opening of the auxiliary plate and the outer diameter of the connecting flange is 10-20 mm.

[0021] In one optional embodiment, the variable frequency motor further includes a cooler located in the inner cavity of the cooling housing and connected between the air inlet of the cooling housing and the guide inlet of the cooling fan; under the guidance of the cooling fan, the cold air flows through the air inlet of the cooling housing and the cooling fan to the air outlet.

[0022] In one optional embodiment, the variable frequency motor further includes a suction nozzle, which includes a suction inlet and a suction outlet. The suction nozzle and the cooler are detachably connected, and the suction inlet of the suction nozzle is connected to the cooling outlet of the cooler. The suction outlet of the suction nozzle is inserted into the guide inlet of the cooling fan with a clearance fit.

[0023] When using the technical solution provided in this application, the variable frequency motor provided by this application, by setting a detachable auxiliary plate, can have the auxiliary plate removed or replaced as needed, or auxiliary plates with different thicknesses and weights can be used to meet various resonance avoidance requirements. For example, when the resonance problem of the variable frequency motor mainly originates from a specific frequency, the user can select an auxiliary plate with a specific thickness and weight to specifically adjust the overall mass distribution of the variable frequency motor, thereby effectively suppressing the resonance phenomenon at that specific frequency. In this way, manufacturers can equip variable frequency motors with the same external dimensions with the same auxiliary plate, and each variable frequency motor can be equipped with multiple auxiliary plates, so that users can flexibly decide whether to use auxiliary plates and how many auxiliary plates to use in combination according to various resonance avoidance requirements. Attached Figure Description

[0024] Figure 1This is a three-dimensional schematic diagram of a portion of the structure of a variable frequency motor provided in an embodiment of this application;

[0025] Figure 2 This application is based on Figure 1 An exploded view of a portion of the structure of a variable frequency motor is provided.

[0026] Figure 3 This application is based on Figure 1 An exploded view of a portion of the structure of a variable frequency motor is provided.

[0027] List of reference numerals in the attached diagram:

[0028] 10-Cooling cover, 11-Mounting port, 12-First connection hole;

[0029] 20 - Cooling fan, 21 - Guide inlet.

[0030] 30 - Mounting plate, 31 - First clearance opening, 32 - First mounting hole, 33 - Second connecting hole;

[0031] 40 - Additional plate, 41 - Second clearance opening, 42 - Second mounting hole, 43 - Third mounting hole;

[0032] 50 - Fan motor, 51 - Connecting flange, 52 - Fourth mounting hole;

[0033] 60 - suction nozzle, 61 - adsorption inlet, 62 - adsorption outlet;

[0034] 71-First connector, 72-Second connector, 73-Third connector. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0036] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0037] Variable frequency motors (VFMs) are a general term for motors driven by frequency converters. These motors can achieve different speeds and torques under the drive of the frequency converter to adapt to varying load requirements. VFMs are prone to resonance. One reason for this resonance is that VFMs typically use forced ventilation cooling, with a cooling fan used to dissipate heat from the main motor. This cooling fan is driven by an independent cooling motor, and resonance may occur between the rotational frequency of the cooling motor and the natural frequency of the cooling system. The diverse application scenarios and configuration differences of VFMs make it difficult to use a unified approach to solve the resonance problem. This often results in a customized solution for each VFM, failing to meet the flexible matching requirements of various component specifications and increasing the production and installation costs of VFMs.

[0038] To solve the above-mentioned technical problems, this application provides a variable frequency motor, with reference to... Figures 1 to 3 The variable frequency motor includes a main motor, a cooling housing 10, a cooling fan 20, a mounting plate 30, a fan motor 50, and at least one auxiliary plate 40. The main motor provides power output. The cooling housing 10 is connected to the main motor and includes an inner cavity, an air inlet, an air outlet, and a mounting port 11. The air outlet is connected to the heat-dissipating part of the main motor. The cooling fan 20 is housed in the inner cavity of the cooling housing 10 and can enter and exit the inner cavity through the mounting port 11. The cooling fan 20 guides cold air from the air inlet to the air outlet and directs the cold air towards the heat-dissipating part of the main motor. The mounting plate 30 is connected to the outer surface of the cooling housing 10 and has a first clearance opening 31. 31 and mounting port 11 are connected to each other. The inner diameter of the first clearance port 31 is smaller than the inner diameter of the mounting port 11. The fan motor 50 is connected to the outer surface of the cooling cover 10. The output shaft of the fan motor 50 passes through the first clearance port 31 and the mounting port 11 and extends into the inner cavity of the cooling cover 10, and is connected to the cooling fan 20 in a transmission manner. The auxiliary plate 40 is detachably connected to the outer surface of the mounting plate 30 and is parallel to the mounting plate 30. The auxiliary plate 40 has a second clearance port 41 corresponding to the first clearance port 31. The second clearance port 41 is used to avoid the fan motor 50.

[0039] Based on the above technical solution, the variable frequency motor provided in this application, by providing a detachable auxiliary plate 40, allows for the removal or replacement of the auxiliary plate 40 with plates of different thicknesses and weights as needed, thereby meeting various resonance avoidance requirements. For example, when the resonance problem of the variable frequency motor mainly originates from a specific frequency, the user can select an auxiliary plate 40 with a specific thickness and weight to specifically adjust the overall mass distribution of the variable frequency motor, thereby effectively suppressing the resonance phenomenon at that specific frequency. In this way, manufacturers can equip variable frequency motors with the same external dimensions with the same auxiliary plate 40, and each variable frequency motor can be equipped with multiple auxiliary plates 40, allowing users to flexibly decide whether to use the auxiliary plate 40 and how many auxiliary plates 40 to use in combination, according to various resonance avoidance requirements.

[0040] In this application, the inner cavity formed by the cooling housing 10 for accommodating the cooling fan 20 is used as a reference. The side of each component facing the "inner cavity" is called the inner side or inner surface, and the side away from the "inner cavity" is called the outer side or outer surface. For example, the side of the mounting plate 30 away from the "inner cavity" is called the outer surface, and the auxiliary plate 40 is located on the side of the mounting plate 30 away from the "inner cavity". The auxiliary plate 40 and the outer surface of the mounting plate 30 are connected.

[0041] The main motor is not shown in the figure. The main motor is a component of the variable frequency motor used to provide power output for the equipment to be driven by external users.

[0042] The cooling housing 10 is a component connected and fixed together with the main motor. It is mainly used to house the cooling fan 20 and guide the cool air flow to the heat dissipation parts of the main motor. The cooling fan 20 rotates under the drive of the fan motor 50, effectively drawing cool air in from the air inlet of the cooling housing 10 and expelling it through the air outlet, while ensuring that the cool air can be blown to the key heat dissipation areas of the main motor.

[0043] Mounting plate 30 is a key component connecting cooling cover 10 and fan motor 50. The first clearance opening 31 on it is connected to the mounting opening 11 of cooling cover 10. By making the inner diameter of the first clearance opening 31 smaller than the inner diameter of the mounting opening 11, it is ensured that the output shaft of fan motor 50 can pass through smoothly, and the structural stability is increased. This ensures that fan motor 50 is reliably mounted on cooling cover 10 through mounting plate 30, that is, cooling cover 10 provides load-bearing force for fan motor 50.

[0044] The fan motor 50 is the power source that drives the cooling fan 20 to rotate. Its output shaft passes precisely through the corresponding openings in the mounting plate 30 and the cooling shroud 10, thus achieving a transmission connection with the cooling fan 20. This design ensures that the cooling fan 20 can operate stably and efficiently under the drive of the fan motor 50.

[0045] The design of at least one additional plate 40 solves the problem in the prior art where a single customized solution for a variable frequency motor cannot accommodate the flexible matching needs of multiple component specifications. These additional plates 40 are detachably connected to the mounting plate 30, facilitating not only installation and replacement but, more importantly, providing the variable frequency motor with additional possibilities for mass adjustment and resonance suppression. By selecting additional plates 40 of different thicknesses or weights, or by stacking multiple additional plates 40, users can flexibly adjust the overall mass distribution of the variable frequency motor, thereby effectively avoiding resonance.

[0046] For example, two additional plates 40 of different thicknesses can be provided for the variable frequency motor. Various weight combinations can be provided by arranging and combining these two additional plates 40. The additional plates 40 can be stacked and connected to the mounting plate 30 in a manner parallel to the mounting plate 30.

[0047] In one possible embodiment, reference Figures 1 to 3 The outer contours of the mounting plate 30 and the auxiliary plate 40 are identical, and their outer contour dimensions are the same. This design ensures that after the auxiliary plate 40 is installed on the mounting plate 30, the overall appearance is flat, improving aesthetics. Furthermore, the larger overlapping contact area between the mounting plate 30 and the auxiliary plate 40 helps improve the structural rigidity of the mounting plate 30 and avoids installation instability or increased vibration caused by inconsistent contours. Simultaneously, the identical outer contour dimensions facilitate the standardized production and replacement of the auxiliary plate 40, improving the maintenance efficiency of the variable frequency motor.

[0048] It should be clarified that the outer contour of the mounting plate 30 refers to the shape of its outer edge, and does not include the shape of the internal mounting opening 11. The outer contour of the auxiliary plate 40 refers to the shape of its outer edge, and does not include the shape of the internal first clearance opening 31.

[0049] In one example, the mounting plate 30 is annular, and the auxiliary plate 40 is annular. In another example, both the mounting plate 30 and the auxiliary plate 40 can be polygonal annular.

[0050] In one possible embodiment, reference Figure 3 The additional plate 40 can be an integral ring plate. That is, the additional plate 40 is an integrally formed plate, which can be a circular ring or a polygonal ring, and this application does not limit it.

[0051] In another possible embodiment, the additional plate 40 may include a first part and a second part that are separate from each other. The first part includes a first notch, and the second part includes a second notch. The first part is used to connect with one half of the mounting plate 30, and the second part is used to connect with the other half of the mounting plate 30. When both the first part and the second part are connected to the mounting plate 30, the first part and the second part abut to form a second clearance opening 41 composed of the first notch and the second notch. With this design, on the one hand, the installation and removal of the additional plate 40 are more convenient. Since the second clearance opening 41 is formed by the abutment of the first notch and the second notch, the size relationship between the inner diameter of the second clearance opening 41 and the outer diameter of the fan motor 50 is not involved. The additional plate 40 can be removed from the mounting plate 30 or added to the mounting plate 30 without disassembling the fan motor 50. On the other hand, the additional plate 40 is more flexible in structure and can be disassembled and combined according to actual needs. For example, when a certain side of the variable frequency motor has higher requirements for resonance suppression, the user can choose to install only the first or second part of the auxiliary plate 40 in that side to achieve targeted quality adjustment and resonance suppression. This design improves the flexibility and adaptability of the auxiliary plate 40, making the resonance suppression scheme for the variable frequency motor more refined and effective.

[0052] The auxiliary plate 40 may include a first part and a second part that are separate from each other. This can be understood as follows: a virtual plane perpendicular to the auxiliary plate 40 divides the auxiliary plate 40 into two parts, simultaneously dividing the second clearance opening 41 into two parts, thus obtaining the separate first part and second part. There is no direct connection between these two parts. When both parts are mounted on the mounting plate 30, the first part and the second part align, and the first notch and the second notch align, thereby forming the second clearance opening 41. The overall shape of the first part and the second part after alignment is the same as the overall shape of the integrally formed auxiliary plate 40.

[0053] The installation methods for mounting plate 30 and auxiliary plate 40 are described below:

[0054] In one possible embodiment, reference Figure 3The variable frequency motor also includes multiple first connecting members 71, and the mounting plate 30 includes multiple first mounting holes 32. The first connecting members 71 pass through the first mounting holes 32 and are detachably connected to the cooling cover 10. The multiple first mounting holes 32 are distributed at intervals around the mounting opening 11. Based on this technical solution, by distributing multiple first mounting holes 32 around the mounting opening 11 and connecting the first connecting members 71 to the cooling cover 10 after passing through the first mounting holes 32, the mounting plate 30 and the cooling cover 10 can be firmly connected, improving structural stability and reliability, and allowing the fan motor 50 to be stably supported by the cooling cover 10. At the same time, the design of multiple first mounting holes 32 also facilitates the positioning and fixing of the mounting plate 30 during the installation process, improving installation efficiency.

[0055] In one example, the first connector 71 may include a fastener with external threads such as a bolt or screw. The cooling housing 10 may have multiple threaded holes, and the first connector 71, after passing through the first mounting hole 32, can be threadedly connected to the threaded holes on the cooling housing 10. In another example, the first connector 71 may be a snap-fit ​​component. The cooling housing 10 may have a snap-fit ​​structure that mates with the snap-fit ​​component. The first connector 71, after passing through the first mounting hole 32, can be snap-fitted and fixed to the snap-fit ​​structure on the cooling housing 10. When using a snap-fit ​​structure, attention must be paid to the dimensional design to ensure that after the snap-fit ​​component and the cooling housing 10 are snap-fitted together, the mounting plate 30 and the cooling housing 10 are in tight contact to ensure connection stability and prevent the mounting plate 30 from becoming loose relative to the cooling housing 10.

[0056] Furthermore, in one implementation, reference is made to... Figure 2 and Figure 3 The auxiliary plate 40 may include multiple second mounting holes 42, which correspond to the first mounting holes 32. The first connector 71 passes through the second mounting holes 42 and the first mounting holes 32 in sequence and is then connected to the cooling cover 10. Based on this technical solution, the auxiliary plate 40 and the mounting plate 30 can be fixed to the cooling cover 10 together using the first connector 71, eliminating the need for separate fixing of the auxiliary plate 40, thus simplifying the installation steps and improving installation efficiency. Furthermore, since the auxiliary plate 40 and the mounting plate 30 are fixed to the cooling cover 10 through the same set of first connectors 71, the connection between the auxiliary plate 40, the mounting plate 30, and the cooling cover 10 is more stable, which helps to improve the stability and reliability of the overall structure.

[0057] Further reference Figure 3 The cooling cover 10 may be provided with a first connecting hole 12. The first connecting member 71 may include a bolt and a nut. After the bolt passes through the second mounting hole 42, the first mounting hole 32 and the first connecting hole 12 in sequence, it is threadedly connected to the nut, thereby connecting the auxiliary plate 40, the mounting plate 30 and the cooling cover 10 together.

[0058] Although the auxiliary plate 40 and the mounting plate 30 can be connected together by the first connector 71, the strength and stability may be poor.

[0059] Therefore, in one possible embodiment, reference Figure 3 The variable frequency motor may also include multiple second connectors 72, and the additional plate 40 may also include multiple third mounting holes 43, which are spaced apart around the second clearance opening 41. The second connectors 72 pass through the third mounting holes 43 and are detachably connected to the mounting plate 30. The orthographic projection of the third mounting holes 43 onto the mounting plate 30 is located within the range of the mounting opening 11, and they are spaced apart around the first clearance opening 31 of the mounting plate 30. Based on this technical solution, the additional plate 40 can be fixed to the mounting plate 30 using the second connectors 72. When the second connectors 72 and the first connectors 71 are used together, the connection strength and stability between the additional plate 40 and the mounting plate 30 can be further improved. Simultaneously, since the third mounting holes 43 are spaced apart around the second clearance opening 41 of the additional plate 40, and the orthographic projection of the third mounting holes 43 onto the mounting plate 30 is located within the range of the mounting opening 11, the additional plate 40, after being installed on the mounting plate 30, can increase the structural rigidity of the mounting plate 30, enabling the mounting plate 30 to more stably support the fan motor 50. In addition, the projection of the third mounting hole 43 toward the mounting plate 30 is within the range of the mounting opening 11, which also allows the auxiliary plate 40 to be positioned more accurately during installation, improving the convenience and accuracy of installation.

[0060] In one example, the second connector 72 may include a fastener with external threads, such as a bolt or screw. The mounting plate 30 may have multiple threaded holes, and the second connector 72, after passing through the third mounting hole 43, can be threadedly connected to the threaded holes on the mounting plate 30. In another example, the second connector 72 may be a snap-fit ​​component. The mounting plate 30 may have a snap-fit ​​structure that mates with the snap-fit ​​component. The second connector 72, after passing through the third mounting hole 43, can be snap-fitted and fixed to the snap-fit ​​structure on the cooling cover 10. When using a snap-fit ​​structure, attention must be paid to the dimensional design to ensure that after the snap-fit ​​component and the mounting plate 30 are snap-fitted together, the mounting plate 30 and the auxiliary plate 40 can be in close contact to ensure connection stability and prevent the auxiliary plate 40 from becoming loose relative to the mounting plate 30.

[0061] For instructions on installing fan motor 50, please refer to the following:

[0062] In one possible embodiment, reference Figure 3The variable frequency motor also includes multiple third connecting parts 73. The fan motor 50 includes a connecting flange 51. The inner diameter of the second clearance opening 41 of the auxiliary plate 40 is larger than the outer diameter of the connecting flange 51. The connecting flange 51 is provided with multiple fourth mounting holes 52. The third connecting parts 73 pass through the fourth mounting holes 52 and connect to the mounting plate 30. Based on this technical solution, the fan motor 50 and the mounting plate 30 can be directly connected and fixed together through the connecting flange 51. This connection method simplifies the installation steps and improves assembly efficiency. At the same time, since the connecting flange 51 is provided with multiple fourth mounting holes 52, the third connecting parts 73 can pass through the fourth mounting holes 52 and connect to the corresponding structure on the mounting plate 30. Therefore, the connection between the fan motor 50 and the mounting plate 30 is more stable, which is conducive to improving the stability and reliability of the overall structure. In addition, the inner diameter of the second clearance opening 41 of the auxiliary plate 40 is larger than the outer diameter of the connecting flange 51. This design ensures that the connecting flange 51 of the fan motor 50 can pass smoothly through the second clearance opening 41 of the auxiliary plate 40 and achieve a reliable connection with the mounting plate 30. At the same time, the auxiliary plate 40 will not interfere with the installation of the fan motor 50.

[0063] For example, refer to Figure 2 The mounting plate 30 is provided with a second connecting hole 33, and the third connecting member 73 includes a bolt and a nut. The bolt passes through the fourth mounting hole 52 and the second connecting hole 33 in sequence and is then threadedly connected to the nut, thereby connecting the fan motor 50 and the mounting plate 30 together.

[0064] In another possible embodiment, the fan motor 50 can be connected to the mounting plate 30 in other ways. For example, the fan motor 50 can be provided with a snap-fit ​​structure, and the mounting plate 30 can be provided with a slot that mates with the snap-fit ​​structure, thus fixing the fan motor 50 in place by snapping it into the slot. Alternatively, the fan motor 50 can be provided with a mounting post, and the mounting plate 30 can be provided with a mounting groove that mates with the mounting post, thus fixing the fan motor 50 in place by the engagement of the mounting post and the mounting groove. These installation methods can all achieve a reliable connection between the fan motor 50 and the mounting plate 30, while simplifying the installation steps and improving assembly efficiency.

[0065] In one embodiment, the difference between the inner diameter of the second clearance opening 41 of the auxiliary plate 40 and the outer diameter of the connecting flange 51 is 10-20 mm. For example, it can be 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, or 20 mm. By limiting the difference between the inner diameter of the second clearance opening 41 of the auxiliary plate 40 and the outer diameter of the connecting flange 51, the inner diameter of the second clearance opening 41 of the auxiliary plate 40 can be controlled within a suitable range while ensuring that the second clearance opening 41 can effectively avoid the connecting flange 51. This results in a larger overlapping contact area between the auxiliary plate 40 and the mounting plate 30, which is beneficial for the stable support of the fan motor 50.

[0066] Furthermore, a vibration damping pad can be installed between the connecting flange 51 of the fan motor 50 and the mounting plate 30. The vibration damping pad can effectively reduce the amplitude of vibrations generated by the fan motor 50 during operation transmitted to the mounting plate 30, thus reducing the occurrence of resonance. The vibration damping pad can be made of elastic materials such as rubber or silicone, providing good vibration damping and durability.

[0067] To enhance cooling, the variable frequency motor also includes a cooler located inside the cooling housing 10 and connected between the air inlet of the cooling housing 10 and the guide inlet 21 of the cooling fan 20. Guided by the cooling fan 20, cool air flows through the air inlet of the cooling housing 10 and the cooling fan 20 to the air outlet. Based on this technical solution, the cooler can further cool the natural cool air entering through the air inlet, and the cool air further cooled by the cooler can have a better cooling effect on the heat dissipation parts of the main motor.

[0068] Furthermore, to prevent fan vibration from being directly transmitted to the cooler, in one embodiment, refer to Figure 3 The variable frequency motor also includes a suction nozzle 60, which includes an adsorption inlet 61 and an adsorption outlet 62. The suction nozzle 60 is detachably connected to the cooler, and the adsorption inlet 61 of the suction nozzle 60 is connected to the cooling outlet of the cooler. The adsorption outlet 62 of the suction nozzle 60 is inserted into the guide inlet 21 of the cooling fan 20 with a clearance fit. Based on this technical solution, by making the adsorption outlet 62 of the suction nozzle 60 inserted into the guide inlet 21 of the cooling fan 20 with a clearance fit, the impact of fan vibration on the cooler can be effectively reduced, while ensuring that cold air can flow into the cooling fan 20, avoiding the situation where a large amount of cold air cannot enter the cooling fan 20. The adsorption inlet 61 of the suction nozzle 60 is connected to the cooling outlet of the cooler, ensuring that cold air can flow smoothly to the adsorption outlet 62. In addition, the detachable connection between the suction nozzle 60 and the cooler facilitates installation and disassembly, and also facilitates cleaning and maintenance of the suction nozzle 60.

[0069] In one example, the suction outlet 62 of the suction nozzle 60 can be inserted into the guide inlet 21 of the cooling fan 20 by a length of 2-5 mm. This design ensures that the cool air can smoothly enter the guide inlet 21 of the cooling fan 20, while avoiding interference with the operation of the cooling fan 20 due to excessive insertion length.

[0070] In one example, the cooling inlet of the cooler and the air inlet of the cooling casing 10 can be connected by a connecting pipe so that cold air can smoothly enter the cooler for cooling.

[0071] This application does not specifically limit the structure of the cooler. In one example, the cooler may include cooling pipes and cooling fins. Coolant is disposed inside the cooling pipes, and cooling fins are disposed on the outer wall of the cooling pipes. The cooling fins can increase the heat exchange area between the cooling pipes and the cold air, thereby improving the cooling efficiency.

[0072] This application does not specifically limit the structure of the cooling fan 20. In one possible embodiment, the cooling fan 20 may include fan blades and a fan shaft. One end of the fan shaft is connected to the output shaft of the fan motor 50, and the other end is fixedly connected to the fan blades. Driven by the fan motor 50, the fan shaft drives the fan blades to rotate, thereby realizing the introduction and exhaust of cool air. To improve the cooling effect, the shape, number, and arrangement of the fan blades can be designed according to actual needs.

[0073] In another possible embodiment, the blades of the cooling fan 20 are streamlined. The streamlined blade design allows the cooling fan 20 to more efficiently guide cool airflow to the heat-dissipating parts of the main motor during rotation, improving heat dissipation efficiency. At the same time, the streamlined blades also reduce air resistance, lowering the energy consumption of the fan motor 50.

[0074] In summary, the variable frequency motor provided in this application, through the adoption of a detachable add-on plate 40 design, not only improves the adaptability and flexibility of the variable frequency motor but also effectively solves the resonance problem, reducing production and maintenance costs. This design is not only suitable for variable frequency motors of various specifications but can also be widely applied to other mechanical equipment that requires avoiding resonance, possessing broad market prospects and application value.

[0075] It should be noted that, depending on the implementation needs, the various components / steps described in the embodiments of the present invention can be broken down into more components / steps, or two or more components / steps or parts of the operation of components / steps can be combined into new components / steps to achieve the purpose of the embodiments of the present invention.

[0076] The above embodiments are only used to illustrate the embodiments of the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the embodiments of the present invention. Therefore, all equivalent technical solutions also fall within the scope of the embodiments of the present invention, and the patent protection scope of the embodiments of the present invention should be defined by the claims.

Claims

1. A variable frequency motor characterized by, The variable frequency motor includes: The main motor is used to provide power output; A cooling cover (10) is connected to the main motor. The cooling cover (10) includes an inner cavity, an air inlet, an air outlet, and a mounting port (11). The air outlet is connected to the heat dissipation part of the main motor. A cooling fan (20) is housed in the inner cavity of the cooling cover (10) and can enter and exit the inner cavity through the mounting port (11). The cooling fan (20) is used to guide cold air from the air inlet to the air outlet and blow the cold air toward the heat dissipation part of the main motor. The mounting plate (30) is connected to the outer surface of the cooling cover (10) and has a first clearance opening (31). The first clearance opening (31) and the mounting opening (11) are connected in correspondence. The inner diameter of the first clearance opening (31) is smaller than the inner diameter of the mounting opening (11). A fan motor (50) is connected to the outer surface of the cooling cover (10). The output shaft of the fan motor (50) passes through the first clearance opening (31) and the mounting opening (11) and extends into the inner cavity of the cooling cover (10), and is connected to the cooling fan (20) in a transmission. At least one additional plate (40) is detachably connected to the outer surface of the mounting plate (30) and parallel to the mounting plate (30). The additional plate (40) has a second clearance opening (41) corresponding to the first clearance opening (31), and the second clearance opening (41) is used to avoid the fan motor (50).

2. The variable frequency electric motor of claim 1, wherein, The outer contour of the mounting plate (30) is the same as that of the auxiliary plate (40), and the outer contour dimensions are the same.

3. The variable frequency electric motor of claim 1, wherein, The additional plate (40) includes a first part and a second part that are separated from each other. The first part includes a first notch, and the second part includes a second notch. The first part is used to connect with one half of the mounting plate (30), and the second part is used to connect with the other half of the mounting plate (30). When both the first part and the second part are connected to the mounting plate (30), the first part and the second part abut and enclose to form a second clearance opening (41) composed of the first notch and the second notch.

4. The variable frequency motor according to claim 1, characterized in that, The variable frequency motor also includes a plurality of first connectors (71), and the mounting plate (30) includes a plurality of first mounting holes (32). The first connectors (71) pass through the first mounting holes (32) and are detachably connected to the cooling cover (10). The plurality of first mounting holes (32) are distributed at intervals around the mounting opening (11).

5. The variable frequency electric motor of claim 4, wherein, The additional plate (40) includes a plurality of second mounting holes (42), which correspond to the first mounting holes (32). The first connector (71) passes through the second mounting holes (42) and the first mounting holes (32) in sequence and is connected to the cooling cover (10).

6. The variable frequency electric motor of claim 1, wherein, The variable frequency motor also includes a plurality of second connectors (72), and the additional plate (40) also includes a plurality of third mounting holes (43), which are spaced apart around the second clearance opening (41); The second connector (72) passes through the third mounting hole (43) and is detachably connected to the mounting plate (30). The orthographic projection of the third mounting hole (43) toward the mounting plate (30) is located within the range of the mounting opening (11) and is distributed at intervals around the first clearance opening (31) of the mounting plate (30).

7. The variable frequency electric motor of claim 1, wherein, The variable frequency motor also includes multiple third connectors (73), the fan motor (50) includes a connecting flange (51), and the inner diameter of the second clearance opening (41) of the auxiliary plate (40) is larger than the outer diameter of the connecting flange (51). The connecting flange (51) is provided with a plurality of fourth mounting holes (52), and the third connector (73) passes through the fourth mounting holes (52) and is connected to the mounting plate (30).

8. The variable frequency electric motor of claim 7, wherein, The difference between the inner diameter of the second clearance opening (41) of the auxiliary plate (40) and the outer diameter of the connecting flange (51) is 10-20 mm.

9. The variable frequency electric motor of claim 1, wherein, The variable frequency motor also includes a cooler, which is located in the inner cavity of the cooling cover (10) and is connected between the air inlet of the cooling cover (10) and the guide inlet (21) of the cooling fan (20); Guided by the cooling fan (20), the cold air flows through the air inlet of the cooling cover (10) and the cooling fan (20) to the air outlet.

10. The variable frequency motor according to claim 9, characterized in that, The variable frequency motor also includes a suction nozzle (60), which includes an adsorption inlet (61) and an adsorption outlet (62). The suction nozzle (60) and the cooler are detachably connected, and the adsorption inlet (61) of the suction nozzle (60) is connected to the cooling outlet of the cooler. The adsorption outlet (62) of the suction nozzle (60) is inserted into the guide inlet (21) of the cooling fan (20) with a clearance fit.

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