Motor end cover and motor

Abstract

The utility model provides a kind of motor end cover and motor, motor includes output shaft, stator on the output shaft and the winding being set in the stator, the motor further includes bearing on output shaft, the inner end face of the motor end cover has towards motor, the inner end face is recessed and forms bearing groove towards the side away from the motor, the motor end cover is set in the stator end, the winding is adjacent the motor end cover setting, it is characterized by: the motor end cover is equipped with heat dissipation flow channel and is located the radial outer side of the bearing groove, the projection of the heat dissipation flow channel along axial direction and the projection of the winding along axial direction form overlapping region. By being equipped with heat dissipation flow channel in motor end cover and making the projection of the flow channel body along axial direction and the projection of the winding along axial direction exist overlapping region, to winding and bearing can be realized sufficient heat dissipation, ensure that motor can still maintain stable temperature when high load operation.

Description

Technical Field

[0001] This utility model relates to the field of motor structure, and in particular to a motor end cover and a motor. Background Technology

[0002] With the continuous increase in motor power density, the internal heat generation of motors has increased dramatically. Insufficient effective heat dissipation space leads to excessively high internal temperatures, shortening the lifespan of insulation materials, reducing operating efficiency, and even causing motor failure. The importance of motor heat dissipation lies in effectively maintaining the motor temperature rise within a reasonable range, improving motor efficiency, and ensuring safe and stable operation. Statistics show that 30% to 40% of permanent magnet motor failures are caused by excessive temperature rise. Therefore, adopting an efficient and reliable heat dissipation system to prevent heat accumulation in critical motor components is of great significance to the motor's lifespan, efficiency, and operational safety.

[0003] However, existing motors face a heat dissipation bottleneck. The windings and bearings of existing motors have poor heat dissipation, which seriously affects the lifespan and function of the motors.

[0004] In view of this, it is necessary to propose a new technical solution to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a motor end cover and a motor to solve the problem of poor heat dissipation of windings and bearings in existing motors.

[0006] To achieve the above objectives, this utility model provides a motor end cover. The motor includes an output shaft, a stator located on the output shaft, and a winding disposed within the stator. The motor also includes a bearing on the output shaft. The motor end cover has an inner end face facing the motor, and the inner end face is recessed to form a bearing groove on the side away from the motor. The motor end cover is disposed at the end of the stator, and the winding is disposed adjacent to the motor end cover. The motor end cover has a heat dissipation channel located radially outside the bearing groove, and the axial projection of the heat dissipation channel overlaps with the axial projection of the winding.

[0007] As a further improvement of this utility model, the length of the overlapping area in the radial direction accounts for 20%-80% of the length of the projection of the winding in the radial direction.

[0008] As a further improvement of this utility model, the length of the overlapping area in the radial direction accounts for 30%-70% of the length of the projection of the winding in the radial direction.

[0009] As a further improvement of this utility model, the heat dissipation channel is a single channel, which is coaxially arranged with the bearing groove.

[0010] As a further improvement of this utility model, the number of heat dissipation channels is multiple and arranged in a circular array.

[0011] As a further improvement of this utility model, the heat dissipation channel is bent in both the radial and circumferential directions.

[0012] As a further improvement of this utility model, the projection surface of the heat dissipation channel along the axial direction is one of Z-shaped, U-shaped, or labyrinth-shaped.

[0013] This utility model also provides an electric motor, which includes an output shaft, a bearing located on the output shaft, a stator disposed outside the output shaft, and a winding disposed within the stator. The electric motor also includes the motor end cover as described above.

[0014] As a further improvement of this utility model, the heat dissipation channel is provided with a channel inlet and a channel outlet, and the channel inlet and the channel outlet are connected to the water inlet channel and the water outlet channel on the motor body.

[0015] As a further improvement of this utility model, the motor body includes a motor housing or a stator.

[0016] As a further improvement of this utility model, the motor also includes an external liquid cooling component, which is disposed outside the motor and connected to the inlet and outlet of the heat dissipation channel.

[0017] As a further improvement of this utility model, the motor end cover is disposed at the front end and / or rear end of the motor.

[0018] As a further improvement of this utility model, the motor also includes a heat-conducting connector, which thermally connects the motor end cover and the winding.

[0019] As a further improvement of this utility model, the thermally conductive connector is a potting compound, which thermally connects the winding and the motor end cover.

[0020] The beneficial effect of this utility model is that by setting a heat dissipation channel inside the motor end cover and making the projection of the channel body along the axial direction overlap with the projection of the winding along the axial direction, sufficient heat dissipation of the winding and bearing can be achieved. Attached Figure Description

[0021] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the structure of the motor of this utility model; Figure 2This is a three-dimensional structural diagram of the motor of this utility model; Figure 3 This is a three-dimensional structural diagram of the motor end cover of this utility model; Figure 4 This is a cross-sectional schematic diagram of the motor end cover with a labyrinth-shaped heat dissipation channel according to this utility model. Figure 5 This is a cross-sectional schematic diagram of the motor end cover with a U-shaped heat dissipation channel according to this utility model. Figure 6 This is a cross-sectional schematic diagram of the O-shaped heat dissipation channel of the motor end cover of this utility model. Figure 7 This is a three-dimensional structural diagram of the motor housing according to Embodiment 4 of this utility model; Figure 8 This is a cross-sectional structural diagram of the motor housing according to Embodiment 4 of this utility model; Figure 9 This is a schematic diagram of the internal flow channel of the motor housing and the heat dissipation flow channel inside the motor end cover, according to Embodiment 4 of this utility model. Figure 10 yes Figure 2 Schematic diagram of the cross-sectional structure of AA; Figure 11 yes Figure 10 A magnified structural diagram of region B in the middle; Figure 12 This is a schematic diagram of the heat spreader plate of the motor of this utility model. Detailed Implementation

[0022] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0025] like Figures 1 to 12 As shown, the motor 100 of this utility model embodiment includes a motor end cover 2, an output shaft 9, a bearing 10 located on the output shaft, a rotor and a stator 7 sleeved on the output shaft 9, and a winding 3 disposed in the stator 7. The motor end cover 2 has an inner end face 22 facing the motor, and the inner end face 22 is recessed on the side away from the motor 100 to form a bearing groove 23.

[0026] The motor 100 can be a motor with a housing 1 or a motor without a housing. In this embodiment, the motor 100 has a housing 1.

[0027] The motor end cover 2 is disposed at the front end and / or rear end of the motor 100. When disposed at the front end, it is called the front end cover, and when disposed at the rear end, it is called the rear end cover.

[0028] In one embodiment, the motor end cover 2 is provided with heat dissipation channels 21. Each heat dissipation channel 21 includes a channel inlet 211, a channel outlet 212, and a channel body 213. The channel body 213 is located radially inside the channel inlet 211 and the channel outlet 212. The axial projection of the heat dissipation channel 21 overlaps with the axial projection of the winding 3 to dissipate heat from the winding 3. The larger the overlap area, the better the heat dissipation effect on the winding 3. Here, the axial projection refers to the orthographic projection along the axial direction. Different heat dissipation effects can be achieved by varying the proportion of the axial projection of the overlap area relative to the radial projection of the winding 3.

[0029] In one embodiment, the motor end cover 2 has an inner end face 22 facing the motor 100. The inner end face 22 is recessed on the side away from the motor 100 to form a bearing groove 23. The bearing groove 23 is used to accommodate the bearing 10. The flow channel body 213 approaches the bearing groove 23 radially to dissipate heat from the bearing 10 in the bearing groove 23, thereby removing the mechanical losses generated by the bearing 10, reducing the temperature of the bearing 10, reducing wear and oxidation of the bearing 10, and extending its service life; maintaining the temperature of the lubricating oil of the bearing 10, reducing the wear of the bearing 10, and improving equipment efficiency; improving the stability and reliability of the equipment, and preventing equipment failure due to the bearing 10. The winding 3 is located close to the motor end cover 2, and the axial projection of the heat dissipation flow channel 21 in the motor end cover overlaps with the axial projection of the winding 3. Therefore, the heat dissipation flow channel 21 of the motor end cover 2 can achieve cooling of the winding 3.

[0030] The motor 100 can have a motor end cover 2 at one end and a regular end cover at the other end, or it can have a motor end cover 2 at both ends.

[0031] In this embodiment, the flow channel inlet 211 and the flow channel outlet 212 are exposed axially toward the housing 1. In other embodiments, the flow channel inlet 211 and the flow channel outlet 212 may also be exposed radially on the side wall of the motor end cover 2. The flow channel is provided in the housing 1 to realize the entry and exit of the coolant in the heat dissipation flow channel 21 in the motor end cover 2.

[0032] In other embodiments, if the motor 100 is a casingless motor, the flow channel inlet 211 and flow channel outlet 212 are exposed axially toward the stator, and the flow channel is provided in the stator to realize the entry and exit of coolant in the heat dissipation flow channel 21 in the motor end cover 2.

[0033] In one embodiment, the motor 100 further includes an external liquid cooling component, which is disposed outside the motor 100 and connected to the inlet 211 and outlet 212 of the heat dissipation channel 21, so as to realize independent circulation of coolant in the heat dissipation channel 21, that is, the heat dissipation channel in the end cover may not be connected to the channel in the motor housing.

[0034] In one embodiment, the number of heat dissipation channels 21 on each motor end cover 2 is one or more.

[0035] like Figure 6 As shown, when there is only one heat dissipation channel 21, the channel body 213 is O-shaped, and the radial cross-section of the channel body 213 is coaxially arranged with the bearing groove 23. It should be noted that the channel body 213 only needs to be generally O-shaped in axial cross-section, and this embodiment does not require the channel body 213 to be a standard annular shape.

[0036] When there are multiple heat dissipation channels 21, the multiple heat dissipation channels 21 are arranged in a circumferential array. Each heat dissipation channel 21 is bent in both the radial and circumferential directions.

[0037] like Figures 3 to 5 As shown, the projection surface of the heat dissipation channel along the axial direction is one of Z-shaped, U-shaped, or labyrinth-shaped. This arrangement can increase the length of each channel body 213, allowing the coolant to have a longer flow path. On the other hand, it can also increase the proportion of the radial length of the overlapping area to the radial length of the axial projection of the winding 3, thereby improving the heat dissipation effect on the winding 3.

[0038] For motor end caps 2 with different numbers of heat dissipation channels 21 and for motor 100 with housing 1 having motor end caps 2 at one or both ends, this utility model provides the following four embodiments: Example 1: In this embodiment, the motor end cover 2 has a heat dissipation channel 21, and the motor 100 is provided with the motor end cover 2 at only one end, which can be a front end cover or a rear end cover.

[0039] The motor end cover 2 has one heat dissipation channel 21. The housing 1 has an inlet and an outlet, and the housing 1 also has an inlet channel and an outlet channel. The inlet channel connects the inlet to the channel inlet 211 of the motor end cover 2, and the outlet channel connects the outlet to the channel outlet 212 of the motor end cover 2. The inlet channel and the outlet channel can be connected to the channels inside the motor, or they can be set independently.

[0040] Coolant enters the inlet channel from the inlet and flows into the channel body 213 from the channel inlet 211 to dissipate heat from the winding 3 and bearing 10. Then it flows into the outlet channel through the channel outlet 212 and is discharged from the outlet.

[0041] Example 2: In this embodiment, the motor end cover 2 has multiple heat dissipation channels 21, and the motor 100 is provided with the motor end cover 2 at only one end, which is either a front end cover or a rear end cover.

[0042] The motor end cover 2 has multiple heat dissipation channels 21 arranged in a circular array. The housing 1 also has multiple series channels. The housing 1 has an inlet and an outlet. The series channels connect multiple heat dissipation channels 21 in series. The inlet channel connects the inlet of one heat dissipation channel 21 to its inlet 211, and the outlet channel connects the outlet of another heat dissipation channel 21 to its outlet 212. In this embodiment, each heat dissipation channel 21 is U-shaped to connect the inlet 211 and outlet 212 of two adjacent heat dissipation channels 21. The heat dissipation channels 21 can be configured to be relatively short along the axial direction, mainly for connecting the heat dissipation channels 21, or they can be configured to be relatively long, cooling other components within the housing 1 along the axial direction. The series channels are radially adjacent to the windings 3, and the series channels can also achieve the effect of cooling the windings 3.

[0043] The coolant enters the inlet channel from the inlet and flows into the channel body 213 from the channel inlet 211. Then it enters the series channel and the adjacent heat dissipation channel 21 in sequence to dissipate heat from the winding 3 and the bearing 10. Finally, it flows into the outlet channel through the channel outlet 212 of a heat dissipation channel 21 and is discharged from the outlet.

[0044] Example 3: In this embodiment, the motor end cover 2 has a heat dissipation channel 21, and the motor 100 is provided with motor end covers 2 at both ends. The motor end cover 2 includes a front end cover and a rear end cover.

[0045] The housing 1 is provided with an inlet channel, an outlet channel and a connecting channel along the circumferential direction. The housing 1 is provided with an inlet and an outlet. The connecting channel is used to connect the inlet 211 of the heat dissipation channel 21 at one end and the outlet 212 of the heat dissipation channel 21 at the other end. The outlet channel is used to connect the outlet and the outlet 212 of the heat dissipation channel 21 at one end. The inlet channel is used to connect the inlet and the inlet 211 of the heat dissipation channel 21 at the other end.

[0046] Coolant enters the inlet channel from the inlet and flows into the channel body 213 from the channel inlet 211 of the heat dissipation channel 21 at one end. Then it flows out from the channel outlet 212 of the heat dissipation channel 21 at that end, flows into the channel body 213 at the other end after passing through the connecting channel. The coolant in the channel bodies 213 at both ends dissipates heat from the winding 3 and the bearing 10. Then it flows into the outlet channel from the channel outlet 212 at the other end and is discharged from the outlet.

[0047] Example 4: like Figures 7 to 9 As shown, in this embodiment, the number of heat dissipation channels 21 on the motor end cover 2 is multiple and arranged in a circular array, and the motor 100 is provided with motor end covers 2 at both ends, the motor end cover 2 including a front end cover and a rear end cover.

[0048] The housing 1 is provided with an inlet channel 11 and an outlet channel 12 along the circumference, and a plurality of connecting channels 13 are arranged at intervals along the circumference. The heat dissipation channels 21 at both ends are connected in series through the connecting channels. The housing 1 is provided with an inlet 14 and an outlet 15. The outlet channel 12 is used to connect the outlet 15 and the outlet 212 of one heat dissipation channel 21 at one end. The inlet channel 11 is used to connect the inlet 14 and the inlet 211 of one heat dissipation channel 21 at the other end.

[0049] Coolant enters the inlet channel 11 through the inlet 14 and flows into the channel body 213 from the channel inlet 211 of the heat dissipation channel 21 at one end. It then sequentially enters the connecting channel 13 and the heat dissipation channel 21 at the other end to dissipate heat from the windings 3 and bearings 10. Finally, it flows into the outlet channel 12 through the channel outlet 212 of the heat dissipation channel 21 at the other end and is discharged from the outlet 15. In this embodiment, the motor end caps 2 at both ends can dissipate heat from the windings 3 on both sides. Simultaneously, multiple connecting channels 13 can dissipate heat from the housing 1 and other structures within the housing 1. Furthermore, optimizing the channel layout and flow rate can significantly reduce the temperature rise at the ends of the windings 3, ensuring that the motor 100 maintains a stable temperature even under high load operation.

[0050] like Figures 10 to 12 As shown, in order to achieve better heat dissipation for winding 3, a heat-conducting connector 4 is also provided in this embodiment. The heat-conducting connector 4 is made of heat-conducting material and heat-conductingly connects the motor end cover 2 and winding 3.

[0051] The heat-conducting connector 4 contacts the housing 1 and the motor end cover 2. The axial projection of the heat dissipation channel 21 overlaps with the axial projection of the heat-conducting connector 4. By setting the heat-conducting connector 4 and making it directly contact the housing 1 and the motor end cover 2, better heat conduction is achieved, resulting in better heat dissipation for the winding 3.

[0052] The thermally conductive connector 4 can be a first connector 41 made of potting compound or a second connector 42 made of other thermally conductive materials, or both can be used. The thermally conductive connector 4 establishes a heat conduction path between the winding and the motor end cover and motor housing. Specifically, the first connector 41 can seal the motor end cover, motor housing, and winding together with potting compound. The second connector 42 is embedded or partially embedded within the first connector 41.

[0053] The second connector 42 includes a first heat dissipation section 421 in contact with the winding 3, a second heat dissipation section 422 in contact with the housing 1, and a connecting section 423 for connecting the first heat dissipation section 421 and the second heat dissipation section 422. Multiple first heat dissipation sections 421 and second heat dissipation sections 422 are arranged alternately. The second connector 42 is a heat spreader or a heat pipe. By setting the second connector 42, better heat exchange between the winding 3 and the housing 1 can be achieved, and heat dissipation of the winding 3 can be realized. In this embodiment, the phase change cooling principle inside the second connector 42 is used to quickly and efficiently transfer the heat generated by the winding 3 during operation to the inner wall of the housing 1, and then a large amount of heat is carried away by the cooling medium flowing inside the housing 1, achieving a highly efficient heat dissipation effect.

[0054] To verify the effectiveness of this invention, a simulation experiment was conducted on a motor 100 with a housing 1 using general fluid heat transfer software in this embodiment. In the simulation experiment of this invention, the coolant was industrial hydraulic oil, the cooling flow rate was uniformly 17.5 L / min, and the total loss of the motor 100 was 2400 W.

[0055] In this embodiment, the temperature rise reduction experiment of the winding 3 is carried out using the motor end cover 2 of the O-type flow channel body 213. Here, the motor end cover 2 is the front cover. Except for the comparison, all are provided with heat dissipation flow channels 21 and heat-conducting connectors 4. The motor end cover 3 is the front cover. The ratio of the radial length of the overlapping area to the radial length of the projection of the winding is referred to as the radial ratio of the overlapping area. The results are as follows:

[0056] The following is a graph showing the relationship between the radial proportion of the overlapping area and the temperature rise / fall of the winding, compiled based on simulation test results:

[0057] Since the radial proportion of the overlapping area is positively correlated with the percentage reduction in winding temperature rise, a radial proportion greater than 20% has a good cooling effect. At this point, the percentage reduction in winding temperature rise can effectively extend the motor life and improve operational stability. However, a radial proportion of the overlapping area greater than 80% has a certain impact on structural rigidity and will cause a decrease in the strength of the motor end cover 2. Therefore, it is preferable to control the radial proportion of the overlapping area between 20% and 80%.

[0058] Taking into account both the percentage reduction in temperature rise and the strength of the motor end cover 2, it is advisable to further control the radial proportion of the overlapping area within 30%-70%. Understandably, controlling the radial proportion of the overlapping area to 40%, 50%, or 60% provides better heat dissipation and structural strength for the motor end cover.

[0059] Experiments were conducted on different embodiments. In the comparative example, only a heat-conducting connector was provided inside the motor end cover, without a heat dissipation channel. Except for the control example, all embodiments were provided with both heat dissipation channels and heat-conducting connectors, and the radial proportion of the overlapping area was 50%. The temperature rise reduction experiments under different embodiments are as follows:

[0060] The experimental data above show that: 1. By setting a heat dissipation channel 21 inside the motor end cover 2, and ensuring that the axial projection of the channel body 213 overlaps with the axial projection of the winding 3, sufficient heat dissipation of the winding 3 and bearings can be achieved; 2. When heat dissipation channels are set in both the front and rear end covers of the motor, the heat dissipation effect on the winding 3 and bearings is better; 3. The heat dissipation effect of the motor end cover with a Z-shaped channel body is better than that of the motor end cover with a U-shaped or O-shaped channel body; 4. The setting of the heat-conducting connector can also achieve the effect of heat dissipation of the windings; 5. The combined use of heat dissipation channels and heat-conducting connectors can more effectively dissipate heat from the windings 3 and bearings, ensuring that the motor 100 can maintain a stable temperature even under high load operation.

[0061] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A motor end cover, the motor including an output shaft, a stator located on the output shaft, and a winding disposed within the stator, the motor further including a bearing on the output shaft, the motor end cover having an inner end face facing the motor, the inner end face being recessed to form a bearing groove on the side away from the motor, the motor end cover being disposed at the end of the stator, and the winding being disposed adjacent to the motor end cover, characterized in that: The motor end cover is provided with a heat dissipation channel located radially outside the bearing groove, and the axial projection of the heat dissipation channel overlaps with the axial projection of the winding.

2. The motor endshield of claim 1, wherein: The radial length of the overlapping region is between 20% and 80% of the radial length of the projection of the winding.

3. The motor end bell of claim 1, wherein: The radial length of the overlapping region accounts for 30%-70% of the radial length of the projection of the winding.

4. The motor end bell of claim 1, wherein: There is one heat dissipation channel, which is coaxially arranged with the bearing groove.

5. The motor end bell of claim 1, wherein: The number of heat dissipation channels is multiple and arranged in a circular array.

6. The motor endshield of claim 1, wherein: The heat dissipation channels are arranged with bends in both the radial and circumferential directions.

7. The motor endshield of claim 6, wherein: The projection surface of the heat dissipation channel along the axial direction is one of Z-shaped, U-shaped, or labyrinth-shaped.

8. An electric machine characterized by: The motor includes an output shaft, a bearing located on the output shaft, a stator disposed outside the output shaft, and a winding disposed within the stator. The motor also includes a motor end cover as described in any one of claims 1-7.

9. The electric machine of claim 8, wherein: The heat dissipation channel is provided with a channel inlet and a channel outlet, and the channel inlet and the channel outlet are connected to the water inlet channel and the water outlet channel on the motor body.

10. The electric machine of claim 9, wherein: The motor body includes a motor housing or a stator.

11. The electric machine of claim 8, wherein: The motor also includes an external liquid cooling component, which is disposed outside the motor and connected to the inlet and outlet of the heat dissipation channel.

12. The electric machine of claim 8, wherein: The motor end cap is located at the front end and / or rear end of the motor.

13. The electric machine of claim 8, wherein: The motor also includes a heat-conducting connector, which thermally connects the motor end cover to the winding.

14. The electric machine of claim 13, wherein: The thermally conductive connector is a potting compound, which thermally connects the winding to the motor end cover.

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