Air-cooled motor

Abstract

The utility model discloses an air-cooled motor, which comprises a casing, a stator and a rotor which are positioned in the casing, and a rotating shaft positioned in the rotor, a front end cover and a rear end cover are arranged at two axial ends of the rotating shaft, and the front end cover, the rear end cover and the casing are enclosed to form a motor casing. A cooling fan is arranged on the side, located on the front end cover, of the rotating shaft, a plurality of stator cooling channels are formed in the axial direction of the stator, a plurality of rotor cooling channels are formed in the axial direction of the rotor, a plurality of machine shell cooling channels are formed in the axial direction of the machine shell, a first air inlet is formed in the front end cover, and a second air inlet is formed in the rear end cover. A first air inlet is formed in the motor shell, a second air inlet is formed in the rear end cover, and under the action of the cooling fan, gas entering from the first air inlet flows through the motor shell cooling channel and flows out of the motor shell, and gas entering from the second air inlet flows through the rotor cooling channel and the stator cooling channel and then flows out of the motor shell. According to the air-cooled motor provided by the utility model, the motor can effectively dissipate heat through a bidirectional ventilation structure, and the noise of the motor is reduced.

Description

Technical Field

[0001] This utility model relates to the field of motors, specifically an air-cooled motor. Background Technology

[0002] During motor operation, heat is inevitably generated due to various losses. To ensure the motor can operate normally and reach its design life, heat dissipation needs to be considered during motor design. Existing air-cooled motor ventilation structures suffer from problems such as unreasonable structural design, low space utilization, low heat dissipation efficiency, high noise, and high cost.

[0003] Therefore, a new technical solution is needed to solve the above-mentioned technical problems. Utility Model Content

[0004] The main objective of this invention is to provide an air-cooled motor with high heat dissipation efficiency, uniform heat dissipation temperature distribution, low noise, and high space utilization.

[0005] This utility model proposes an air-cooled motor, which includes a housing, a stator and a rotor located within the housing, and a rotating shaft located within the rotor. A front end cover and a rear end cover are provided at both ends of the rotating shaft along its axial direction. The front end cover and the rear end cover, together with the housing, form a motor housing. A cooling fan is provided on one side of the rotating shaft near the front end cover. Multiple stator cooling channels are provided along the axial direction of the stator, multiple rotor cooling channels are provided along the axial direction of the rotor, and multiple housing cooling channels are provided along the axial direction of the housing. A first air inlet is provided on the front end cover, and a second air inlet is provided on the rear end cover. Under the action of the cooling fan, gas entering through the first air inlet flows through the housing cooling channels and exits the motor housing, and gas entering through the second air inlet flows through the rotor cooling channels and the stator cooling channels before exiting the motor housing.

[0006] In one specific embodiment, a plurality of first air outlets are provided on the radial outer wall of the rear end cover and / or the housing near the rear end cover. The first air outlets correspond to the positions of the housing cooling channels. Gas entering through the first air inlet flows through the housing cooling channels and then flows out of the motor housing through the first air outlets.

[0007] In one specific embodiment, the radial sidewall of the housing near the front cover is provided with a plurality of second air outlets. The gas entering through the second air inlet flows through the stator cooling channel and the rotor cooling channel and then flows out of the motor housing through the second air outlet.

[0008] In one specific embodiment, the second air outlet and the housing cooling channel are staggered in the circumferential direction of the housing.

[0009] In one specific embodiment, the housing includes an inner wall and an outer wall, and a plurality of ribs are provided along the axial direction of the housing. The ribs connect the inner wall and the outer wall along the axial direction, and a cooling channel is formed between two adjacent ribs.

[0010] In one specific embodiment, the housing cooling channel has an air inlet, the size of which along the circumference of the housing is smaller than the size of the housing cooling channel along the circumference of the housing.

[0011] In one specific embodiment, the cooling fan includes a support plate and a first fan blade and a second fan blade located on both sides of the support plate. The support plate is connected to the rotating shaft. The first fan blade is disposed facing the front end cover, and the second fan blade is disposed away from the front end cover.

[0012] In one specific embodiment, the edge of the second fan blade is provided with a guide hub, which guides the gas flowing through the stator cooling channel and the rotor cooling channel to flow out along the second air outlet.

[0013] In one specific embodiment, the distance between the upper edge of the first air inlet away from the rotating shaft and the rotating shaft is 1 / 4 to 1 / 3 of the radial length of the front end cover.

[0014] In one specific embodiment, the air-cooled motor is an asynchronous motor.

[0015] The air-cooled motor proposed in this invention achieves bidirectional ventilation by setting axial cooling channels on the casing and on the stator and rotor. This effectively improves the motor's heat convection capacity, enhances its heat dissipation, and alleviates the problem of large temperature differences between the front and rear ends. Furthermore, bidirectional ventilation is achieved using only a single cooling fan. The ingenious design of the cooling fan, along with the casing, front cover, and rear cover, forms two independent, open cooling channels. This high utilization rate of the cooling fan effectively reduces its outer diameter and lowers the noise level during motor operation. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a cross-sectional view of the cooling structure in the air-cooled motor in this embodiment of the present invention;

[0018] Figure 2 This is a cross-sectional view of the air-cooled motor in the embodiment of this utility model from perspective II;

[0019] Figure 3 This is a cross-sectional view of the air-cooled motor from the KK perspective in an embodiment of this utility model;

[0020] Figure 4 In this embodiment of the utility model, the air-cooled motor is Figure 2 A cross-sectional view from JJ's perspective;

[0021] Figure 5 In this embodiment of the utility model, the air-cooled motor is Figure 2 A cross-sectional view from the HH perspective.

[0022] Explanation of icon numbers:

[0023] label name label name 100 air-cooled motor 201 Stator cooling channel 10 chassis 301 Rotor cooling channel 20 stator 501 First air inlet 30 rotor 601 First air outlet 40 pivot 602 Second air inlet 50 Front cover 1011 Second air outlet 60 rear cover 1012 air inlet 70 Cooling fan 1013 Inner wall 701 support plate 1014 outer wall 702 First blade 1015 tendons 703 Second fan blade 202 winding 704 Guide hub 302 guide bar 101 Chassis cooling channel 303 end ring

[0024] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0025] The technical solutions of the present utility model 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 utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0027] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] Existing motor ventilation structures generally include unidirectional and bidirectional ventilation. Existing unidirectional motor ventilation structures have the following technical problems: 1. After the air enters the motor and is heated at the front end, the temperature difference between the air and the motor decreases when it reaches the rear end of the air duct, reducing the heat dissipation efficiency and resulting in a large temperature difference between the two ends of the motor. In severe cases, this may lead to premature failure due to thermal stress fatigue; 2. Due to the long air duct, a sufficiently large air pressure is required to drive the air to flow along the air duct inside the motor. This often results in a relatively large outer diameter of the fan blades, which leads to higher motor noise.

[0030] The existing bidirectional ventilation structure of motors has the following technical problems: 1. The air inlet is often located in the middle of the motor, with radial air inlets on the circumference. This structure can easily reduce the strength of the casing and often requires additional reinforcing ribs to ensure the reliability of the motor; 2. Since the motor takes in air radially, the rotor and stator laminations must be divided into units of equal or unequal thickness in the axial direction to ensure that the gas can flow fully through the stator and rotor. This structure will increase the length of the stator and rotor and reduce the axial space utilization rate; 3. The air outlet is located at the drive end and the non-drive end of the motor, requiring two independent fans to complete the gas circulation.

[0031] Combination Figures 1-5 As shown, Figure 1 This is a cross-sectional view of the motor structure in an embodiment of this utility model. Figure 2 This is a cross-sectional view of the motor from perspective II in an embodiment of this utility model. Figure 3 This is a cross-sectional view of the motor from the KK perspective in an embodiment of the present invention. Specifically, the KK perspective of the motor is the perspective of the motor rotated by a certain angle along the circumference of the motor. Figure 1 The part above the rotating shaft is the motor's second-view perspective. Figure 1 The portion above the rotating shaft is the KK view of the motor, which facilitates the demonstration of the motor's bidirectional ventilation structure. Figure 2 The middle view is from angle II of the motor, which facilitates the demonstration of the structure of the motor cooling duct B. Figure 3 The middle view is from the KK perspective of the motor, which makes it easy to show the structure of the motor cooling air duct A; Figure 4 In the embodiments of this utility model, the motor is in Figure 2A cross-sectional view from JJ's perspective; Figure 5 In the embodiments of this utility model, the motor is in Figure 2 A cross-sectional view from the HH perspective. Figure 4 and Figure 5 It facilitates the display of the casing structure.

[0032] This utility model embodiment proposes an air-cooled motor 100, which includes a housing 10, a stator 20 and a rotor 30 located within the housing, and a rotating shaft 40 located within the rotor 30. A front end cover 50 and a rear end cover 60 are provided at both ends of the rotating shaft 40 along its axial direction. The front end cover 50 and the rear end cover 60, together with the housing 10, form a motor housing. A cooling fan 70 is provided on one side of the rotating shaft 40 near the front end cover 50. The stator 20 has multiple stator cooling channels 201 along its axial direction, and the rotor 30's shaft... Multiple rotor cooling channels 301 are provided, and multiple housing cooling channels 101 are provided axially in the housing 10. Multiple first air inlets 501 are provided on the front end cover 50, and multiple second air inlets 602 are provided on the rear end cover. Under the action of the cooling fan 70, gas enters from the first air inlets 501, flows through the housing cooling channels 101, and exits outside the motor housing. Gas also enters from the second air inlets 602, flows through the rotor cooling channels 301 and the stator cooling channels 201, and exits outside the motor housing. Understandably, in this embodiment, the driving end of the motor is the front end, and the non-driving end is the rear end. In other embodiments, the non-driving end of the motor can also be the front end, and the driving end the rear end. Understandably, the front end cover 50 is a support component for the front bearing of the motor, and a bearing chamber is formed at the center of the front end cover to install the front bearing. The rear end cover 60 is a support component for the rear bearing of the motor, and a bearing chamber is also formed at the center of the rear end cover 60 to install the rear bearing. In a specific embodiment, the air-cooled motor can be an asynchronous motor.

[0033] Understandably, the number of stator cooling channels 201, rotor cooling channels 301, and housing cooling channels 101 is not limited and can be the same or different. At the same time, the shape of each cooling channel can be a round hole or a hole of other shapes designed according to the electromagnetic scheme.

[0034] Among them, combined Figure 3 As shown, the rear cover has multiple first air outlets 601, which correspond to the positions of the housing cooling channels 101. The gas entering from the first air inlet 501 flows through the multiple housing cooling channels 101 and then flows out of the motor housing through the corresponding first air outlets 601.

[0035] In other embodiments, the first air outlet 601 can also be provided on the housing. Specifically, the first air outlet 601 is provided on the outer wall of the housing cooling channel near the rear end cover 60. In this case, the gas entering from the first air inlet 501 flows through multiple axial housing cooling channels 101 and then flows out of the motor housing through the radial first air outlet. Understandably, the first air outlet on the housing 10 and the first air outlet on the rear end cover 601 can coexist.

[0036] Combination Figure 4-5 As shown, the housing 10 includes an inner wall 1013 and an outer wall 1014. Multiple ribs 1015 are also provided axially along the housing 10. These ribs 1015 connect and support the inner wall 1013 and the outer wall 1014 along the axial direction. Two adjacent ribs 1015, together with the inner wall 1013 and the outer wall 1014, form a housing cooling channel 101. The housing cooling channel 101 has an air inlet 1012. Gas entering from the first air inlet 501 enters the housing cooling channel 101 through the air inlet 1012. The dimension of the air inlet 1012 along the circumference of the motor is smaller than the dimension of the housing cooling channel 101 along the circumference of the motor. This design increases the airflow area of ​​the housing cooling channel 101, reducing the air velocity at the first air outlet 601. This reduces the noise during motor 100 operation.

[0037] Combination Figure 2 As shown, the housing 10 has multiple second air outlets 1011 on its radial sidewall near the front end cover 50. Specifically, the second air outlets 1011 penetrate the radial sidewall of the housing 10. Gas entering from the second air inlet 1011 flows through the axial stator cooling channel 201 and rotor cooling channel 301 and then exits the motor housing through the penetrating second air outlets 602. Specifically, the multiple second air outlets 1011 are located on the radial sidewall of the housing on the side of the cooling fan support plate 701 facing the rear end cover 60.

[0038] Combination Figure 4-5 As shown, multiple second air outlets 1011 and multiple housing cooling channels 101 are staggered in the circumferential direction of the housing. The housing cooling channels 101 are arranged to extend through the housing 10 along the axial direction, while the second air outlets 1011 are arranged to extend through the housing 10 radially.

[0039] Combination Figure 1-3As shown in the embodiment of this utility model, the cooling fan 70 includes a support plate 701 and a first fan blade 702 and a second fan blade 703 located on both sides of the support plate 701. One side of the support plate 701 is connected to the rotating shaft 40 and rotates with the rotating shaft 40. The other side of the support plate 701 supports each other with the inner wall 1013 of the housing, thus blocking the bidirectional airflow. Specifically, the first fan blade 702 is positioned towards the front cover 50, and the second fan blade 703 is positioned away from the front cover 50, that is, towards the internal space of the motor 100. When the motor 100 is running, the cooling fan 70 rotates together with the rotating shaft. The cooling fan 70 is a driving component for the airflow along the bidirectional cooling duct.

[0040] The second fan blade 703 has a guide hub 704 on its edge, which guides the gas flowing through the stator cooling channel 201 and the rotor cooling channel 301 to flow out along the second air outlet 1011.

[0041] The ventilation principle of the bidirectional cooling air duct is explained in detail below.

[0042] A two-way cooling duct refers to a cooling channel with two opposing flow directions along the motor's axial direction, such as... Figure 2 The cooling duct A shown has a second blade 703 of the cooling fan 70 positioned within the space enclosed by the support plate 701, the housing 10, and the rear end cover 60. When the motor 100 is running, the cooling fan 70 rotates with the rotor. Under the action of the second blade 703, a pressure difference is created inside the motor, driving the gas to enter the motor from the second air inlet 602 located on the rear end cover 60. Inside the motor, the gas is divided; a portion flows over the surface of the stator windings at the rear end cover 60 and enters the stator cooling channel 201. The airflow from the guide hub 704 of the cooling fan flows into the second fan blade 703. A portion of the airflow passes over the surface of the rotor guide bar 302 and end ring 303 at the rear end cover 60 and enters the rotor cooling channel 301. After being guided by the guide hub 704 of the cooling fan 70, the airflow flows into the second fan blade 703. Driven by the second fan blade 703, the incoming airflow flows out from the second air outlet 1011. It is worth noting that the airflow direction of the cooling air duct A is axial, and the airflow direction is radial.

[0043] like Figure 3 The cooling duct B shown has a first blade 702 of the cooling fan 70 located within the cavity enclosed by the front cover 50 and the support plate 701. When the motor is running, the cooling fan 70 rotates with the rotor, and under the action of the first blade 702, a pressure difference is formed at the front cover 50. This pressure difference drives the gas to enter the motor from the first air inlet 501 located on the front cover 50, and then, driven by the first blade 702, enters the air inlet 1012 on the housing 10, thus entering the housing cooling channel 101. The gas then flows through the housing cooling channel 101 and exits the motor housing from the second air outlet 1011 located on the rear cover 60.

[0044] The aforementioned cooling air ducts A and B work together to achieve bidirectional ventilation for the motor, effectively improving its heat convection capacity, enhancing its heat dissipation, mitigating the large temperature difference between the front and rear ends, and resulting in a more uniform temperature distribution at both ends of the motor. Simultaneously, a single cooling fan 70 achieves bidirectional ventilation. The cooling fan's ingenious structural design utilizes the first blade 702 and the second blade 703 to form two independent, open heat dissipation channels with the housing 10, front cover 50, and rear cover 60. This means that a complex blade design is unnecessary to create two independent, open heat dissipation channels with the housing 10, front cover 50, and rear cover 60. The high utilization rate of the cooling fan 70 effectively reduces the outer diameter of the first blade 702 and the second blade 703, lowering the noise level during motor operation. This ensures that the motor's temperature rise meets design requirements, thereby reducing noise during motor operation.

[0045] In a specific embodiment, the number and shape of the first air inlets 501 provided on the front cover 50 need to be configured according to the structural scheme, and their position is required to be as close as possible to the bearing in order to better balance the heat dissipation of the drive end bearing and improve the reliability of operation. Specifically, the distance between the upper edge of the first air inlet 501 away from the rotating shaft 40 and the rotating shaft 40 is 1 / 4 to 1 / 3 of the radial length of the front cover 50.

[0046] In a specific embodiment, the rear end cover 60 is simultaneously provided with a second air inlet 602 of cooling air duct A and a first air outlet 601 of cooling air duct B, and the arrangement of the first air outlets 601 of cooling air duct B corresponds one-to-one with the cooling channels 101 of the housing. The number and shape of the second air inlets 602 of cooling air duct A need to be configured according to the structural scheme, and their positions should be as close as possible to the bearing to achieve better heat dissipation of the bearing and improve operational reliability. Specifically, the distance between the upper edge of the second air inlet 602 away from the rotating shaft and the rotating shaft 40 can be 1 / 4 to 1 / 3 of the radial length of the rear end cover 60.

[0047] The air-cooled motor in this embodiment of the invention is preferably an asynchronous motor, which allows for an open cooling duct design.

[0048] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

Claims

1. An air-cooled motor, comprising a casing, a stator and a rotor located in the casing, a rotating shaft located in the rotor, a front end cover and a rear end cover located at the axial ends of the rotating shaft, and the front end cover and the rear end cover and the casing enclosing a motor housing, characterized in that: the rotating shaft is provided with a cooling fan on one side of the front end cover, the stator is provided with a plurality of stator cooling channels in the axial direction, the rotor is provided with a plurality of rotor cooling channels in the axial direction, the casing is provided with a plurality of casing cooling channels in the axial direction, the front end cover is provided with a first air inlet, and the rear end cover is provided with a second air inlet, under the action of the cooling fan, the gas entering through the first air inlet flows through the casing cooling channels and flows out of the motor housing, and the gas entering through the second air inlet flows through the rotor cooling channels and the stator cooling channels and then flows out of the motor housing. The rear end cover and / or the radial outer wall of the casing near the rear end cover is provided with a plurality of first air outlets corresponding to the positions of the casing cooling channels, and the gas entering through the first air inlet flows through the casing cooling channels and then flows out of the motor housing through the first air outlets.

2. The air-cooled electric machine of claim 1, wherein, The radial side wall of the casing near the front end cover is provided with a plurality of second air outlets, and the gas entering through the second air inlet flows through the stator cooling channels and the rotor cooling channels and then flows out of the motor housing through the second air outlets.

3. The air-cooled electric machine of claim 1, wherein, The second air outlets and the casing cooling channels are staggered in the circumferential direction of the casing.

4. The air-cooled electric machine of claim 3, wherein, The casing comprises an inner wall and an outer wall, and is further provided with a plurality of ribs in the axial direction, the ribs connecting the inner wall and the outer wall in the axial direction, and the casing cooling channels being formed between adjacent two ribs.

5. The air-cooled electric machine of claim 1, wherein, The casing cooling channel has an air inlet, and the size of the air inlet in the circumferential direction of the casing is smaller than the size of the casing cooling channel in the circumferential direction of the casing.

6. The air-cooled electric machine of claim 5, wherein, The cooling fan comprises a support plate and first and second fan blades located on both sides of the support plate, the support plate is connected with the rotating shaft, the first fan blade is arranged towards the front end cover, and the second fan blade is arranged away from the front end cover.

7. The air-cooled electric machine of claim 3, wherein, The edge of the second fan blade is provided with a guide hub, and the guide hub guides the gas flowing through the stator cooling channels and the rotor cooling channels to flow out along the second air outlets.

8. The air-cooled electric machine of claim 7, wherein, The distance between the upper edge of the first air inlet away from the rotating shaft and the rotating shaft is 1 / 4-1 / 3 of the radial length of the front end cover.

9. The air-cooled electric machine of claim 1, wherein, The air-cooled motor is an asynchronous motor.

10. The air-cooled electric machine of claim 1, wherein, ​

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