Oil ring of oil-cooled motor and preparation method thereof

Abstract

The invention discloses an oil ring of an oil cooling motor and a preparation method thereof, the oil cooling motor comprises a shell, a stator and a rotor, the stator and the rotor are arranged in the shell, the stator comprises a stator iron core and an end winding, the oil ring is located at two ends of the stator iron core, N nozzles are distributed on the oil ring, one end of each nozzle is communicated with an oil cavity of the oil ring, and the other end of each nozzle faces the end winding, the nozzle is used for spraying cooling oil to the end winding, the value of N is determined based on the proportion of a sector formed by spraying the cooling oil by the nozzle on the middle circumference of the end winding, the middle circumference of the end winding takes the rotating shaft of the rotor as the circle center, and the radius of the middle circumference of the end winding is between the inner diameter and the outer diameter of the end winding.

Description

Technical Field

[0001] The present application relates to the technical field of motor cooling, and in particular to an oil ring of an oil-cooled motor and a preparation method thereof. Background Art

[0002] The operation of the drive motor will generate a lot of heat. If the motor is in a high temperature and high speed state for a long time, there will be risks such as motor insulation failure and magnetic steel demagnetization, which will affect the normal use of the motor. The cooling methods of the motor mainly include natural cooling, air cooling, water cooling and oil cooling.

[0003] At present, contact oil cooling is the most effective cooling method in current motor cooling technology. Its cooling medium is in direct contact with the heat-generating components inside the motor, which can significantly reduce the heat dissipation thermal resistance of high-heat-generating components such as motor windings, and has extremely high heat dissipation efficiency. The housing of the contact oil-cooled motor is provided with a stator and a rotor. The stator includes a stator core and end windings arranged at both ends of the stator core. Oil rings are arranged at both ends of the stator core, and multiple nozzles are distributed on the oil rings. One end of the nozzle is connected to the oil cavity of the oil ring, and the other end of the nozzle faces the end winding. The cooling oil is sprayed onto the end winding through the oil ring nozzle, so that the cooling oil is in direct contact with high-heat-generating components such as the end winding to take away the heat.

[0004] In the prior art, the number of oil ring nozzles is determined based on human experience, and the number of nozzles is not adjusted specifically for end windings of different sizes. Too many oil ring nozzles may cause waste of cooling oil and increase costs. Too few oil ring nozzles may also cause uneven coverage of cooling oil on end windings of different sizes, making it difficult to achieve the expected cooling effect. Summary of the invention

[0005] In order to solve the above technical problems, the present application determines the minimum number of nozzles installed on the oil ring by calculating the proportion of the fan formed by the oil ring nozzle spraying cooling oil on the middle circumference of the end winding. The middle circumference of the end winding takes the rotor as the center, and the radius of the middle circumference of the end winding is between the inner diameter and the outer diameter of the end winding. It is hoped that the middle circumference can be completely covered with cooling oil without overlapping by using the minimum number of nozzles, thereby taking into account the use efficiency of the cooling oil and the cooling effect of the end winding, thereby reducing costs.

[0006] The embodiments of the present application disclose the following technical solutions:

[0007] The present application provides an oil ring of an oil-cooled motor, characterized in that the oil-cooled motor comprises a housing, a stator and a rotor arranged in the housing, the stator comprises a stator core and an end winding, the oil ring is located at both ends of the stator core, N nozzles are distributed on the oil ring, one end of the nozzle is connected to the oil cavity of the oil ring, the other end of the nozzle faces the end winding, and the nozzle is used to spray cooling oil to the end winding;

[0008] The value of N is determined based on the proportion of the fan formed by the nozzle spraying cooling oil on the middle circumference of the end winding. The middle circumference has the rotor shaft as the center and the radius as the target radius. The value of the target radius is between the inner diameter and the outer diameter of the end winding.

[0009] Optionally, the target radius is an average value of an inner diameter and an outer diameter of the end winding.

[0010] Optionally, the oil ring is on the inner side of the end winding.

[0011] Optionally, the oil ring is outside the end winding.

[0012] Optionally, a cooling oil flow channel is provided inside the shell, and the cooling oil flow channel is connected to the oil ring. The oil-cooled motor also includes a water jacket, and a cooling water flow channel is provided between the water jacket and the shell. The cooling water in the cooling water flow channel is used to cool the cooling oil in the cooling oil flow channel and the stator. The cooling water flow channel is located between the cooling oil flow channel and the shell.

[0013] Optionally, the cooling water flow channel and the cooling oil flow channel have the same size, and the cooling water flow channel and the cooling oil flow channel are located at the same radial position.

[0014] Optionally, a cooling oil flow channel is provided inside the shell, the cooling oil flow channel is connected to the oil ring, a throttle ring is provided in the cooling oil flow channel, and the throttle ring is used to control the cooling oil flow in the oil ring.

[0015] The present application provides a method for preparing an oil ring provided in an oil-cooled motor, wherein the oil-cooled motor comprises a housing, a stator and a rotor provided in the housing, wherein the stator comprises a stator core and end windings, and the method comprises:

[0016] Obtaining the inner diameter and outer diameter of the end winding, wherein the inner diameter and outer diameter of the end winding are used to configure the oil ring of the oil-cooled motor;

[0017] Determine the middle circumference of the end winding according to the inner diameter and the outer diameter of the end winding, wherein the middle circumference takes the rotating shaft of the rotor as the center and the radius is the target radius, and the value of the target radius is between the inner diameter and the outer diameter of the end winding;

[0018] determining the radius of the oil ring according to the position of the oil ring configuration;

[0019] Determining the angle of the fan formed by the nozzle of the oil ring spraying cooling oil, the cooling oil sprayed by the nozzle covers the middle circumference without overlapping;

[0020] Determining the proportion of the fan formed by the nozzle spraying cooling oil on the middle circumference according to the target radius, the radius of the oil ring and the angle of the fan formed by the nozzle spraying cooling oil;

[0021] Determine the number of the nozzles according to the proportion of the fan surface formed by the cooling oil sprayed by the nozzles on the middle circumference;

[0022] The oil ring of the oil-cooled motor is prepared according to the number of the nozzles, and the oil ring is used to be arranged at both ends of the stator core.

[0023] Optionally, when the target radius is the average of the inner diameter and the outer diameter of the end winding, the number of the nozzles is determined by the following formula:

[0024]

[0025] R1 is the average value of the inner diameter and the outer diameter of the end winding, R2 is the radius of the oil ring, and θ is the angle of the fan formed by the nozzle spraying cooling oil.

[0026] The present application provides a preparation device for an oil ring in an oil-cooled motor, characterized in that the oil-cooled motor comprises a housing, a stator and a rotor arranged in the housing, the stator comprises a stator core and end windings, and the device comprises an acquisition unit, a determination unit, and a preparation unit:

[0027] The acquisition unit is used to acquire the inner diameter and the outer diameter of the end winding, and the inner diameter and the outer diameter of the end winding are used to configure the oil ring of the oil-cooled motor;

[0028] The determining unit is used to determine the middle circumference of the end winding according to the inner diameter and the outer diameter of the end winding, wherein the middle circumference has the rotating shaft of the rotor as the center and the radius is the target radius, and the value of the target radius is between the inner diameter and the outer diameter of the end winding;

[0029] The determination unit is further used to determine the radius of the oil ring according to the position where the oil ring is configured;

[0030] The determination unit is further used to determine the angle of the fan formed by the cooling oil sprayed by the nozzle of the oil ring, and the cooling oil sprayed by the nozzle covers the middle circumference without overlapping;

[0031] The determination unit is further used to determine the proportion of the fan formed by the nozzle spraying cooling oil on the middle circumference according to the target radius, the radius of the oil ring and the angle of the fan formed by the nozzle spraying cooling oil;

[0032] The determining unit is further used to determine the number of the nozzles according to the proportion of the fan surface formed by the cooling oil sprayed by the nozzles on the middle circumference;

[0033] The preparation unit is used to prepare the oil ring of the oil-cooled motor according to the number of the nozzles, and the oil ring is used to be arranged at both ends of the stator core.

[0034] It can be seen from the above technical solutions that the present application has the following beneficial effects:

[0035] The present application determines the minimum number of nozzles installed on the oil ring by calculating the proportion of the fan formed by the oil ring nozzle spraying cooling oil on the middle circumference of the end winding. The middle circumference of the end winding takes the rotor as the center, and the radius of the middle circumference of the end winding is between the inner diameter and the outer diameter of the end winding. It is hoped that the middle circumference can be completely covered with cooling oil without overlapping by the minimum number of nozzles. If the radius of the middle circumference is equal to the inner diameter of the end winding, it is easy to cause the overlapping area of ​​the end winding covered by the cooling oil to be too large, resulting in waste of cooling oil. If the radius of the middle circumference is equal to the outer diameter of the end winding, it is easy to cause the gap area of ​​the end winding not covered by the cooling oil to be too large, resulting in uneven cooling of the end winding. In order to balance these two states, the radius of the middle circumference adopted in the present application is between the inner diameter and the outer diameter of the end winding, so that the overlapping part and the gap part of the cooling oil sprayed by the oil ring nozzle on the end winding can be balanced, and during the rotation of the rotor, the gap part of the end winding not covered by the cooling oil will also be covered by the cooling oil due to rotation. The number of nozzles installed on the oil ring is determined based on the proportion of the fan-shaped surface formed by the oil ring nozzle spraying cooling oil on the middle circumference of the end winding, which is the minimum number of nozzles to maintain the balance between the overlapping part and the gap part of the cooling oil sprayed by the oil ring nozzle on the end winding. In addition, because the radius of the middle circumference is determined based on the inner diameter and outer diameter of the end winding, the minimum number of nozzles suitable for the end windings of different sizes can be dynamically calculated, eliminating the influence of human experience, taking into account the use efficiency of the cooling oil and the cooling effect of the end winding, and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0037] Figure 1 This is a schematic diagram of an oil ring nozzle oil injection scheme in an embodiment of the present application;

[0038] Figure 2 This is a schematic diagram of an oil-water mixed cooling solution in an embodiment of the present application;

[0039] Figure 3 This is a schematic diagram of an oil-water heat exchanger built into a motor housing in an embodiment of the present application;

[0040] Figure 4 This is a schematic diagram of the structure of an oil ring and an oil ring nozzle in an embodiment of the present application;

[0041] Figure 5 Schematic diagram of a device for preparing an oil ring in an oil-cooled motor in an embodiment of the present application.

[0042] Explanation of the accompanying drawings: stator core 1, rotor 2, housing 3, water jacket 4, oil ring 5, oil ring nozzle 6, cooling oil flow channel 7, oil-water heat exchanger 8, cooling water flow channel 9, end winding 101, cooling oil inlet 801, cooling water inlet 901, cooling water outlet 902. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0044] This embodiment discloses an oil ring for an oil-cooled motor, which can achieve both the efficiency of cooling oil and the cooling effect of the end winding with a minimum number of oil ring nozzles, thereby reducing costs. Figures 2 to 4 As shown, the motor of this example mainly includes a stator core 1, a rotor 2, a housing 3, a water jacket 4, an oil ring 5, an oil ring nozzle 6, a cooling oil flow channel 7, an oil-water heat exchanger 8, a cooling water flow channel 9, an end winding 101, a cooling oil inlet 801, a cooling water inlet 901, and a cooling water outlet 902. Figure 1-4As shown, the oil ring 5 of the oil-cooled motor in the present application is located at both ends of the stator core, and N oil ring nozzles 6 are distributed on the oil ring 5. One end of the oil ring nozzle 6 is connected to the oil cavity of the oil ring 5, and the other end of the oil ring nozzle 6 faces the end winding 101. The oil ring nozzle 6 is used to spray cooling oil to the end winding 101. The number N of the oil ring nozzles 6 is determined based on the proportion of the fan formed by the oil ring nozzle 6 spraying cooling oil on the middle circumference of the end winding 101. The middle circumference of the end winding 101 takes the rotor 2 as the center, and the radius of the middle circumference of the end winding 101 is between the inner diameter and the outer diameter of the end winding 101. The following, combined with the accompanying drawings, focuses on the technical improvements made by the present application to balance the use efficiency of cooling oil and the cooling effect of the end winding with the minimum number of nozzles to reduce costs.

[0045] Figure 1 This is a schematic diagram of an oil ring nozzle spraying scheme in an embodiment of the present application, wherein R1 refers to the radius of the middle circumference of the end winding 101, R2 is the radius of the oil ring 5, and θ refers to the angle of the fan formed by the oil ring nozzle spraying cooling oil. In the present application, the radius R1 of the middle circumference of the end winding is between the inner diameter and the outer diameter of the end winding, and it is hoped that the middle circumference can be completely covered with cooling oil without overlapping by the minimum number of nozzles. If the radius R1 of the middle circumference is equal to the inner diameter of the end winding, the overlapping area of ​​the cooling oil sprayed by the oil ring nozzle on the end winding is too large, which is easy to cause waste of cooling oil. If the radius R1 of the middle circumference is equal to the outer diameter of the end winding, the gap area of ​​the cooling oil sprayed by the oil ring nozzle on the end winding is too large, which is easy to cause uneven cooling of the end winding. In order to balance these two states, the radius R1 of the middle circle adopted in the present application is between the inner diameter and the outer diameter of the end winding, so that the overlapped part and the gapped part of the cooling oil sprayed by the oil ring nozzle on the end winding can be balanced, and during the rotation of the rotor, the gapped part of the end winding not covered by the cooling oil will also be covered by the cooling oil due to the rotation. On the premise that the fan-shaped surface formed by the oil ring nozzle spraying cooling oil covers the middle circle of the end winding without overlapping, the number of nozzles installed on the oil ring determined based on the proportion of the fan-shaped surface formed by the oil ring nozzle spraying cooling oil on the middle circle of the end winding is the minimum number of nozzles to maintain the overlapped part and the gapped part of the cooling oil sprayed by the oil ring nozzle on the end winding balanced. Because the radius of the middle circle is determined based on the inner diameter and the outer diameter of the end winding, the minimum number of nozzles that are compatible with the end winding of different sizes can be dynamically calculated, eliminating the influence of human experience, and taking into account the use efficiency of the cooling oil and the cooling effect of the end winding, reducing costs.

[0046] In one possible implementation, the radius of the middle circle of the end winding in the present application can be the average value of the inner diameter and the outer diameter of the end winding. When the radius of the middle circle of the end winding is taken as the average value of the inner diameter and the outer diameter of the end winding, the minimum number of nozzles required for the oil ring nozzle to spray cooling oil to cover the middle circle without overlapping is determined. At this time, the overlapping part and the gap part of the fan formed by the oil ring nozzle spraying cooling oil on the end winding are roughly equal, thereby avoiding the waste of cooling oil due to the excessive overlapping area of ​​the end winding covered by the cooling oil and the uneven cooling of the end winding due to the excessive gap area of ​​the end winding not covered by the cooling oil. In addition, during the rotation of the rotor, the gap part of the end winding not covered by the cooling oil will also be covered by the cooling oil due to rotation. When the radius of the middle circle of the end winding is taken as the average value of the inner diameter and the outer diameter of the end winding, the overlapping part and the gap part of the fan formed by the oil ring nozzle spraying cooling oil on the end winding are roughly equal. In this case, the most uniform end winding cooling oil effect can be achieved with the least cooling oil, and the number of nozzles used is also the least. In this way, the cooling oil utilization efficiency and the cooling effect of the end winding are taken into account to the greatest extent, thereby reducing costs.

[0047] When the radius of the middle circumference of the end winding is taken as the average value of the inner diameter and the outer diameter of the end winding, the number of nozzles can be quickly determined according to Formula 1:

[0048]

[0049] R1 represents the average value of the inner and outer diameters of the end winding;

[0050] R2 represents the radius of the oil ring;

[0051] θ represents the angle of the fan formed by the cooling oil sprayed by the oil ring nozzle;

[0052] N represents the number of oil ring nozzles.

[0053] The oil rings 5 ​​of the oil-cooled motor in the present application are located at both ends of the stator core 1. There are two oil rings 5 ​​configured at both ends of the stator core 1. Figure 4 As shown, two oil rings 5 ​​are arranged at both ends of the stator core 1. The oil rings 5 ​​are provided with nozzles 6 for spraying cooling oil to the end windings 101 at both ends of the stator core 1 to cool the end windings 101. The positions of the oil rings 5 ​​inside and outside the end windings 101 are not limited.

[0054] In a possible implementation, the oil ring 5 may be located inside the end winding 101. When the oil ring 5 is located inside the end winding 101, the oil ring nozzle 6 sprays cooling oil from the inside to the outside of the end winding. On the premise that the oil ring nozzle 6 sprays cooling oil outward to cover the middle circumference of the end winding 101 without overlapping, the radius R1 of the middle circumference of the end winding is between the inner diameter and the outer diameter of the end winding. The number of oil ring nozzles 6 is determined based on the proportion of the fan formed by the oil ring nozzle 6 spraying cooling oil on the end winding 101. This is the minimum number of nozzles to maintain the balance between the overlapping part and the gap part of the oil ring nozzle 6 spraying cooling oil on the end winding. This can effectively avoid the problem of cooling oil waste caused by the excessively large overlapping area of ​​the end winding covered by the cooling oil and the uneven cooling of the end winding caused by the excessively large gap area of ​​the end winding not covered by the cooling oil. Determining the minimum number of nozzles to achieve a balanced effect also saves costs.

[0055] In a possible implementation, the oil ring 5 may be located outside the end winding 101. When the oil ring 5 is located outside the end winding 101, the oil ring nozzle 6 sprays cooling oil from the outside to the inside of the end winding 101. On the premise that the oil ring nozzle 6 sprays cooling oil inward to cover the middle circumference of the end winding 101 without overlapping, the radius R1 of the middle circumference of the end winding is between the inner diameter and the outer diameter of the end winding. The number of oil ring nozzles 6 is determined based on the proportion of the fan formed by the oil ring nozzle 6 spraying cooling oil on the end winding. The minimum number of nozzles is to maintain the balance between the overlapping part and the gap part of the oil ring nozzle 6 spraying cooling oil on the end winding. This can effectively avoid the problem of cooling oil waste caused by the excessively large overlapping part of the end winding covered by the cooling oil and the uneven cooling of the end winding caused by the excessively large gap part of the end winding not covered by the cooling oil. Determining the minimum number of nozzles to achieve a balanced effect also saves costs.

[0056] The oil-cooled motor in the present application may include a cooling water flow channel for cooling the cooling oil in the cooling oil flow channel, such as Figure 2As shown in Figure (c), there is a cooling water flow channel 9 on the water jacket 4. As shown in Figure (b), the water jacket 4 is located on the inner side of the motor housing 3. A cooling water inlet 901 and a cooling water outlet 902 are provided on the motor housing 3. The position of the cooling water flow channel 9 is not limited. The position of the cooling water flow channel 9 can be located on the inner side and the outer side of the cooling oil flow channel 7 in Figure (a). A built-in oil-water heat exchanger 8 is provided inside the motor housing 3. At the same time, an oil inlet 801 of the built-in oil-water heat exchanger 8 is also provided on the motor housing 3; the cooling oil passes through the cooling oil on the motor housing 3. The oil inlet 801 enters the built-in oil-water heat exchanger 8, and a cooling oil flow channel 7 is arranged inside the built-in oil-water heat exchanger 8. The cooling oil first exchanges heat with the cooling water through the built-in oil-water heat exchanger 8 integrated on the motor housing 3. After passing through the built-in oil-water heat exchanger 8 of the motor housing 3, the cooling oil enters the oil ring 5. A plurality of oil ring nozzles 6 are arranged on the oil ring 5. The sizes of the nozzles 6 can be equal, and can also be adjusted accordingly according to the temperature distribution of the end winding 101. The cooling oil is directly sprayed on the end winding 101 around the oil ring nozzle 6 to cool it.

[0057] In a possible implementation, the cooling water channel 9 can be located between the cooling oil channel 7 and the motor housing 3, that is, located outside the cooling oil channel 7 and inside the motor housing 3. When the cooling water channel 9 is located outside the cooling oil channel 7 and inside the motor housing, the cooling water in the cooling water channel 9 can also cool down the cooling oil in the cooling oil channel 7. Figure 3 As shown, the cooling oil in the cooling oil flow channel 7 of the built-in oil-water heat exchanger 8 exchanges heat with the cooling water in the cooling water flow channel 9 to achieve the transfer of heat from the motor. The cooling oil flow channel 7 of the built-in oil-water heat exchanger 8 can have various forms, such as the S-shaped flow channel in the present embodiment, and also includes parallel flow channels, spiral flow channels, etc. The present application eliminates the external oil-water heat exchanger of the traditional oil-cooled motor, and integrates the heat exchange device on the motor body. The cooling water flow channel 9 is located on the outside of the cooling oil flow channel 7, and the cooling oil flow channel 7 is located on the outside of the stator core 1. The cooling water in the cooling water flow channel 9 can cool the cooling oil in the cooling oil flow channel 7 while also cooling the stator core 1, thereby improving the level of motor integration while also meeting the cooling needs of the motor.

[0058] In a possible implementation, the size of the cooling water flow channel 9 in the present application can be the same as the size of the cooling oil flow channel 7, and the cooling water flow channel 9 and the cooling oil flow channel 7 are located at the same radial position, such as Figure 2As shown in Figure (a), when the cooling water channel 9 and the cooling oil channel 7 are located at the same radial position and have the same size, the cooling water in the cooling water channel 9 can also cool the cooling oil in the cooling oil channel 7. The cooling water channel 9 built into the motor housing 3 has the same size as the cooling oil channel 7 built into the motor housing 3 and is located at the same radial position, which can also meet the cooling needs of the motor while improving the integration level of the motor.

[0059] In one possible implementation, a throttling ring is provided in the cooling oil flow channel 7 of the present application for controlling the cooling oil flow in the oil ring 5, so as to achieve precise distribution of the cooling oil flow in the oil ring 5 and effectively control the speed at which the oil ring nozzle 6 sprays the cooling oil, thereby preventing the waste of cooling oil or insufficient cooling of the end winding 101 due to too fast or too slow spraying of the cooling oil.

[0060] The embodiment of the present application provides a method for preparing an oil ring provided in an oil-cooled motor, the method specifically comprising the following steps:

[0061] S101: Acquire the inner diameter and outer diameter of the end winding, where the inner diameter and outer diameter of the end winding are used to configure the oil ring of the oil-cooled motor;

[0062] S102: determining a middle circumference of the end winding according to the inner diameter and the outer diameter of the end winding, wherein the middle circumference has the rotating shaft of the rotor as the center and a radius as a target radius, and the value of the target radius is between the inner diameter and the outer diameter of the end winding;

[0063] S103: determining the radius of the oil ring according to the position of the oil ring configuration;

[0064] S104 determines the angle of the fan formed by the nozzle of the oil ring spraying cooling oil, and the cooling oil sprayed by the nozzle covers the middle circumference without overlapping;

[0065] S105: determining a proportion of the fan formed by the nozzle spraying cooling oil on the middle circumference according to the target radius, the radius of the oil ring and the angle of the fan formed by the nozzle spraying cooling oil;

[0066] S106: Determine the number of the nozzles according to the proportion of the fan surface formed by the nozzles spraying cooling oil on the middle circumference;

[0067] S107: preparing the oil ring of the oil-cooled motor according to the number of the nozzles, wherein the oil ring is used to be arranged at both ends of the stator core.

[0068] It can be seen that the embodiment of the present application provides a method for preparing an oil ring set in an oil-cooled motor. The radius of the middle circle used in the present application is between the inner diameter and the outer diameter of the end winding, which can achieve the balance between the overlapping part and the gap part of the cooling oil sprayed by the oil ring nozzle on the end winding, and during the rotation of the rotor, the gap part of the end winding not covered by the cooling oil will also be covered by the cooling oil due to rotation. The number of nozzles installed on the oil ring, which is determined based on the proportion of the fan formed by the oil ring nozzle spraying cooling oil on the middle circle of the end winding, is the minimum number of nozzles that maintains the balance between the overlapping part and the gap part of the cooling oil sprayed by the oil ring nozzle on the end winding. Moreover, because the radius of the middle circle is determined based on the inner diameter and the outer diameter of the end winding, it is possible to dynamically calculate the minimum number of nozzles that are compatible with the end windings of different sizes, eliminating the influence of human experience and reducing costs.

[0069] In a possible implementation, when the target radius is the average value of the inner diameter and the outer diameter of the end winding, the number of the nozzles is determined by the above formula 1. When the radius of the middle circumference of the end winding is the average value of the inner diameter and the outer diameter of the end winding, the overlapped part and the gap part of the fan formed by the oil ring nozzle spraying the cooling oil on the end winding are roughly equal. In this case, the most uniform cooling oil effect of the end winding can be achieved with the least cooling oil, and the number of nozzles used is also the least. In this way, the use efficiency of the cooling oil and the cooling effect of the end winding can be taken into account to the greatest extent, thereby reducing costs.

[0070] Exemplary devices:

[0071] See also Figure 5 , Figure 5 for Figure 5 This is a schematic diagram of a device for preparing an oil ring in an oil-cooled motor in an embodiment of the present application, comprising: an acquisition unit 501, a determination unit 502, and a preparation unit 503:

[0072] An acquisition unit 501 is used to acquire the inner diameter and the outer diameter of the end winding, where the inner diameter and the outer diameter of the end winding are used to configure the oil ring of the oil-cooled motor;

[0073] A determination unit 502 is used to determine the middle circumference of the end winding according to the inner diameter and the outer diameter of the end winding, wherein the middle circumference has the rotation axis of the rotor as the center and the radius is a target radius, and the value of the target radius is between the inner diameter and the outer diameter of the end winding;

[0074] The determination unit 502 is further used to determine the radius of the oil ring according to the position of the oil ring configuration;

[0075] The determination unit 502 is further used to determine the angle of the fan formed by the cooling oil sprayed by the nozzle of the oil ring, and the cooling oil sprayed by the nozzle covers the middle circumference without overlapping;

[0076] The determination unit 502 is further used to determine the proportion of the fan formed by the nozzle spraying cooling oil on the middle circumference according to the target radius, the radius of the oil ring and the angle of the fan formed by the nozzle spraying cooling oil;

[0077] The determination unit 502 is further used to determine the number of the nozzles according to the proportion of the fan formed by the nozzles spraying cooling oil on the middle circumference;

[0078] The preparation unit 503 is used to prepare the oil ring of the oil-cooled motor according to the number of the nozzles, and the oil ring is used to be arranged at both ends of the stator core.

[0079] It can be seen that the present application determines the minimum number of nozzles installed on the oil ring by calculating the proportion of the fan formed by the oil ring nozzle spraying cooling oil on the middle circumference of the end winding. The middle circumference of the end winding takes the rotor as the center, and the radius of the middle circumference of the end winding is between the inner diameter and the outer diameter of the end winding. It is hoped that the middle circumference can be completely covered with cooling oil without overlapping by the minimum number of nozzles. If the radius of the middle circumference is equal to the inner diameter of the end winding, it is easy to cause the overlapping area of ​​the end winding covered by the cooling oil to be too large, resulting in waste of cooling oil. If the radius of the middle circumference is equal to the outer diameter of the end winding, it is easy to cause the gap area of ​​the end winding not covered by the cooling oil to be too large, resulting in uneven cooling of the end winding. In order to balance these two states, the radius of the middle circumference adopted in the present application is between the inner diameter and the outer diameter of the end winding, so that the overlapping part and the gap part of the cooling oil sprayed by the oil ring nozzle on the end winding can be balanced, and during the rotation of the rotor, the gap part of the end winding not covered by the cooling oil will also be covered by the cooling oil due to rotation. The number of nozzles installed on the oil ring, which is determined based on the proportion of the fan-shaped surface formed by the oil ring nozzle spraying cooling oil on the middle circumference of the end winding, is the minimum number of nozzles to maintain a balance between the overlapping part and the gap part of the cooling oil sprayed by the oil ring nozzle on the end winding. In addition, because the radius of the middle circumference is determined based on the inner diameter and outer diameter of the end winding, the minimum number of nozzles that are compatible with the end windings of different sizes can be dynamically calculated, eliminating the influence of human experience and reducing costs.

[0080] The device embodiments described above are merely illustrative, wherein the modules described as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical modules, i.e., they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Those of ordinary skill in the art may understand and implement it without creative work.

[0081] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those of ordinary skill in the art, various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present application shall be included in the scope of protection of the claims of the present application.

Claims

1. An oil ring for an oil-cooled motor, characterized in that: The oil-cooled motor comprises a housing, a stator and a rotor arranged in the housing, the stator comprises a stator core and an end winding, the oil ring is located at both ends of the stator core, N nozzles are distributed on the oil ring, one end of the nozzle is connected to the oil cavity of the oil ring, the other end of the nozzle faces the end winding, and the nozzle is used to spray cooling oil to the end winding; The value of N is determined based on the proportion of the fan formed by the nozzle spraying cooling oil on the middle circumference of the end winding. The middle circumference has the rotor shaft as the center and the radius as the target radius. The value of the target radius is between the inner diameter and the outer diameter of the end winding.

2. The oil ring of the oil-cooled motor according to claim 1, characterized in that: The target radius is an average of the inner diameter and the outer diameter of the end winding.

3. The oil ring of the oil-cooled motor according to claim 1, characterized in that: The oil ring is inside the end winding.

4. The oil ring of the oil-cooled motor according to claim 1, characterized in that: The oil ring is outside the end winding.

5. The oil ring of the oil-cooled motor according to claim 1, characterized in that: A cooling oil flow channel is provided inside the shell, and the cooling oil flow channel is connected to the oil ring. The oil-cooled motor also includes a water jacket, and a cooling water flow channel is provided between the water jacket and the shell. The cooling water in the cooling water flow channel is used to cool the cooling oil in the cooling oil flow channel and the stator. The cooling water flow channel is located between the cooling oil flow channel and the shell.

6. The oil ring of the oil-cooled motor according to claim 5, characterized in that: The cooling water flow channel and the cooling oil flow channel have the same size, and are located at the same radial position as the cooling oil flow channel.

7. The oil ring of the oil-cooled motor according to claim 1, characterized in that: A cooling oil flow channel is arranged inside the shell, the cooling oil flow channel is connected to the oil ring, a throttle ring is arranged in the cooling oil flow channel, and the throttle ring is used to control the flow rate of cooling oil in the oil ring.

8. A method for preparing an oil ring in an oil-cooled motor, characterized in that: The oil-cooled motor comprises a housing, a stator and a rotor arranged in the housing, the stator comprises a stator core and end windings, and the method comprises: Obtaining the inner diameter and outer diameter of the end winding, wherein the inner diameter and outer diameter of the end winding are used to configure the oil ring of the oil-cooled motor; Determine the middle circumference of the end winding according to the inner diameter and the outer diameter of the end winding, wherein the middle circumference takes the rotating shaft of the rotor as the center and the radius is the target radius, and the value of the target radius is between the inner diameter and the outer diameter of the end winding; determining the radius of the oil ring according to the position of the oil ring configuration; Determining the angle of the fan formed by the nozzle of the oil ring spraying cooling oil, the cooling oil sprayed by the nozzle covers the middle circumference without overlapping; Determining the proportion of the fan formed by the nozzle spraying cooling oil on the middle circumference according to the target radius, the radius of the oil ring and the angle of the fan formed by the nozzle spraying cooling oil; Determine the number of the nozzles according to the proportion of the fan surface formed by the nozzles spraying cooling oil on the middle circumference; The oil ring of the oil-cooled motor is prepared according to the number of the nozzles, and the oil ring is used to be arranged at both ends of the stator core.

9. The method according to claim 8, characterized in that When the target radius is the average of the inner diameter and the outer diameter of the end winding, the number of nozzles is determined by the following formula: R1 is the average value of the inner diameter and the outer diameter of the end winding, R2 is the radius of the oil ring, and θ is the angle of the fan formed by the nozzle spraying cooling oil.

10. A device for preparing an oil ring in an oil-cooled motor, characterized in that: The oil-cooled motor comprises a housing, a stator and a rotor arranged in the housing, the stator comprises a stator core and end windings, and the device comprises an acquisition unit, a determination unit, and a preparation unit: The acquisition unit is used to acquire the inner diameter and the outer diameter of the end winding, and the inner diameter and the outer diameter of the end winding are used to configure the oil ring of the oil-cooled motor; The determining unit is used to determine the middle circumference of the end winding according to the inner diameter and the outer diameter of the end winding, wherein the middle circumference has the rotating shaft of the rotor as the center and the radius is the target radius, and the value of the target radius is between the inner diameter and the outer diameter of the end winding; The determination unit is further used to determine the radius of the oil ring according to the position where the oil ring is configured; The determination unit is further used to determine the angle of the fan formed by the cooling oil sprayed by the nozzle of the oil ring, and the cooling oil sprayed by the nozzle covers the middle circumference without overlapping; The determination unit is further used to determine the proportion of the fan formed by the nozzle spraying cooling oil on the middle circumference according to the target radius, the radius of the oil ring and the angle of the fan formed by the nozzle spraying cooling oil; The determining unit is further used to determine the number of the nozzles according to the proportion of the fan surface formed by the cooling oil sprayed by the nozzles on the middle circumference; The preparation unit is used to prepare the oil ring of the oil-cooled motor according to the number of the nozzles, and the oil ring is used to be arranged at both ends of the stator core.

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