Nanometer insulation bearing high-voltage permanent magnet motor

Abstract

The application provides a nano-insulated bearing high-voltage permanent magnet motor, and relates to the technical field of permanent magnet motors.The application comprises a motor shell, a rolling bearing, an oil injection mechanism, an elastic member and a passive abutting mechanism.The inside of the motor shell is provided with a stator which is coaxially provided with a rotating shaft extending to the outside of the motor shell.The rolling bearing is embedded in the bearing chamber and is sleeved with a nano-insulated bearing sleeve.The oil injection mechanism comprises a nozzle, a flow pipe, a first oil pump and an oil tank.The elastic member is installed between the nozzle and the guide part, and the elastic member makes the nozzle have a tendency to move into the guide part.The nozzle is provided with a first injection channel and a second injection channel, both of which are connected with the flow pipe.The injection port of the first injection channel faces the gap between the rolling ball and the inner ring shaft, and the injection port of the second injection channel faces the passive abutting mechanism.The application can solve the problem that the rotor and the rolling bearing are easily damaged.

Description

Technical Field

[0001] This invention relates to the field of permanent magnet motor technology, and in particular to a high-voltage permanent magnet motor with nano-insulated bearings. Background Technology

[0002] High-voltage permanent magnet motors are electric motors powered by high-voltage electricity and widely used in industrial and energy sectors. The main characteristic of this type of motor is the use of permanent magnets to generate a magnetic field, thereby achieving efficient conversion of electrical energy into mechanical energy. Compared to traditional motors, high-voltage permanent magnet motors have higher power density and energy efficiency, and can typically output greater power in a smaller size and weight.

[0003] A high-voltage permanent magnet motor typically consists of a stator, rotor, rolling bearings, and a rotating shaft. The stator is composed of windings that generate a rotating magnetic field when energized; the rotor contains permanent magnets and rotates under the influence of the stator's magnetic field. This type of motor can operate at high speeds and loads, making it suitable for applications requiring high efficiency and reliability, such as power systems, rail transportation, and large machinery. The rotating shaft is coaxially connected to the rotor and extends out of the motor housing via rolling bearings.

[0004] Through long-term practice, the applicant discovered that after prolonged use, the rotor and rolling bearings of the high-voltage permanent magnet motor are prone to damage. Summary of the Invention

[0005] To address the issue of easy damage between the rotor and rolling bearings, this application provides a high-voltage permanent magnet motor with nano-insulated bearings.

[0006] This application provides a high-voltage permanent magnet motor with nano-insulated bearings, employing the following technical solution:

[0007] A high-voltage permanent magnet motor with nano-insulated bearings includes: a motor housing, a stator rotatably disposed inside the motor housing, and a rotating shaft extending partially to the outside of the motor housing coaxially at one end of the stator; a rolling bearing including an inner ring shaft, an outer ring shaft, and balls, the outer ring shaft being coaxially disposed around the inner ring shaft, multiple balls rotatably disposed between the inner and outer ring shafts, a bearing chamber being provided on the side wall of the motor housing, the outer ring shaft being embedded in the bearing chamber, and a nano-insulated bearing sleeve being fitted onto the outer ring shaft, the rotating shaft passing through the inner ring shaft and having an interference fit with the inner ring of the inner ring shaft; and an oil injection mechanism including a nozzle. The system comprises a flow pipe, a first oil pump, and an oil storage tank. An axial oil supply channel is provided within the rotating shaft, and the flow pipe is disposed within the oil supply channel. The oil storage tank is located on one side of the motor housing. The first oil pump is mounted on the oil storage tank, and its inlet end is connected to the interior of the oil storage tank. One end of the flow pipe is rotatably connected to the outlet end of the first oil pump, and the other end extends into the oil supply channel. The rotating shaft is provided with a guide portion, which has a guide cavity communicating with the oil supply channel. The guide portion is perpendicular to the rotating shaft, and at least two sets are arranged circumferentially on the rotating shaft. The nozzle is movable... A flexible element is installed within the guide section and connected to the other end of the flow pipe; an elastic element is installed between the nozzle and the guide section, the elastic element causing the nozzle to tend to move into the guide section. When the first oil pump starts and the rotating shaft rotates, the nozzle is partially pushed out of the guide section under the combined action of the impact force of the cooling oil entering the nozzle and the centrifugal force of the rotating shaft. When the first oil pump is turned off and the rotating shaft stops rotating, the nozzle retracts into the guide section under the elastic force of the elastic element; a passive abutment mechanism is provided with an end cap inside the motor housing near the rolling bearing, through which the rotating shaft passes. The nozzle is rotatably fitted with the end cap, and the guide portion is located inside the end cap. The nozzle has a first spray channel and a second spray channel, both of which are connected to a flow pipe. The spray nozzle of the first spray channel faces the gap between the ball and the inner ring shaft after the nozzle moves out of the guide portion. The spray nozzle of the second spray channel faces the passive abutment mechanism after the nozzle moves out of the guide portion. Under the action of the cooling oil sprayed from the second spray channel, the passive abutment mechanism applies a thrust toward the outer ring shaft to the nano-insulated bearing sleeve, so that the nano-insulated bearing sleeve is pressed against the outer ring shaft.

[0008] Preferably, the nozzle further comprises a drainage channel having a first end and a second end. The first end of the drainage channel is connected to both the first and second spray channels, and the second end is connected to a flow pipe. The inner diameter of the drainage channel gradually decreases from the first end to the second end. The spray nozzles of the first and second spray channels face opposite directions. Both the first and second spray channels are arc-shaped and curved towards opposite sides. The inner diameter of the first spray channel gradually increases from the end near the drainage channel to the spray nozzle, and the inner diameter of the second spray channel gradually decreases from the end near the drainage channel to the spray nozzle.

[0009] Preferably, the connection between the first jet channel and the drainage channel is configured as a first connecting portion, and the connection between the second jet channel and the drainage channel is configured as a second connecting portion. Both the first connecting portion and the second connecting portion are located within the projection of the cross-section of the drainage channel, wherein the inner diameter of the first connecting portion is larger than the inner diameter of the second connecting portion.

[0010] Preferably, the elastic element includes a compression spring, the portion of the flow tube connected to the nozzle is a telescopic tube section, and the compression spring is sleeved on the outside of the telescopic tube section; the inner wall of the guide cavity is provided with a stepped surface, one end of the compression spring is connected to the stepped surface, and the other end is connected to the end of the nozzle.

[0011] Preferably, the passive abutment mechanism includes a pressure-bearing component, a rotating component, and an abutment component. The rotating component is movably disposed on the inner wall of the end cap. The pressure-bearing component and the abutment component are respectively disposed at both ends of the rotating component. When the nozzle is partially pushed out from the guide portion under the combined action of the impact force of the cooling oil entering the nozzle and the centrifugal force of the rotating shaft, the cooling oil sprayed from the spray port of the second spray channel will directly spray onto the pressure-bearing component and apply an impact force to the pressure-bearing component. This will drive the rotating component to rotate and cause the abutment component to abut against the nano-insulated bearing sleeve, so that the nano-insulated bearing sleeve is pressed tightly against the outer ring shaft after being subjected to force.

[0012] Preferably, the pressure-bearing component includes a first annular plate and a first spring. The first annular plate is connected to the inner wall of the end cap via the first spring. Along the axial direction of the rotation axis, the annular surface of the first annular plate is always directly opposite the injection port of the second injection channel that has moved out of the guide portion. The abutment component includes a second annular plate and a second spring. The second annular plate is connected to the inner wall of the end cap via the second spring. Along the axial direction of the rotation axis, the annular surface of the second annular plate is always in contact with the side surface of the nano-insulated bearing sleeve. The rotation assembly... The component includes an L-shaped rod, a first abutting ball, and a second abutting ball. The bent part of the L-shaped rod is rotatably connected to the inner wall of the end cap. The first abutting ball is located at one end of the L-shaped rod and is used to slide against the surface of the first annular plate away from the nozzle. The second abutting ball is located at the other end of the L-shaped rod and is used to slide against the surface of the second annular plate away from the nano-insulated bearing sleeve. When the first annular plate is impacted by cooling oil, it pushes the first abutting ball, driving the L-shaped rod to rotate under force, so that the second abutting ball pushes the second annular plate to abut against the side of the nano-insulated bearing sleeve.

[0013] Preferably, both the first spring and the second spring have telescopic rods in their inner rings. The telescopic direction of the two telescopic rods is parallel to the axial direction of the rotating shaft, and one end of the telescopic rod is connected to the inner sidewall of the end cover, while the other end is connected to the first annular plate and the second annular plate.

[0014] Preferably, the lowest end of the end cap is provided with an outflow pipe, and a recycling tank is provided on one side of the motor housing. The end of the outflow pipe away from the end cap opens toward the upper end of the recycling tank.

[0015] Preferably, the recovery tank is equipped with a filter screen plate, which divides the recovery tank into an upper storage chamber and a lower storage chamber. The metal powder in the cooling oil is held in the upper storage chamber by the blocking effect of the filter screen plate. A return pipe is connected between the oil storage tank and the lower storage chamber. A second oil pump is provided on the return pipe. The second oil pump is used to pump the cooling oil in the lower storage chamber into the oil storage tank.

[0016] Preferably, the portion of the rotating shaft located outside the motor housing is coaxially provided with a circular oil baffle plate. The outer diameter of the circular oil baffle plate is larger than the outer diameter of the rolling bearing, and the gap between the circular oil baffle plate and the motor housing is located directly above the upper opening of the recycling tank.

[0017] The present invention has the following advantages and beneficial effects:

[0018] The selection of rolling bearings and their combination with nano-insulated bearing sleeves significantly improves the insulation performance of the motor. The outer ring shaft is embedded in the bearing housing of the motor housing and fitted with a nano-insulated bearing sleeve, effectively isolating current and reducing discharge phenomena caused by current passing through the bearing. This configuration not only reduces the risk of current damage to internal motor components but also improves the overall efficiency of the motor by reducing frictional losses. Simultaneously, the excellent high-temperature resistance of the nano-insulating material further ensures the stability of the motor in high-temperature environments.

[0019] The oil injection mechanism provides the necessary cooling solution for the motor. The mechanism includes a nozzle, a flow pipe, a first oil pump, and an oil reservoir. Through the oil supply channel, cooling oil is guided from the reservoir to the bearing area. During motor operation, the first oil pump delivers cooling oil to the nozzle, ensuring that the oil effectively covers the bearing and carries away excess heat. This mechanism significantly reduces the bearing temperature, thereby preventing material performance degradation and wear caused by high temperatures and enhancing bearing reliability.

[0020] The nozzle's design incorporates an elastic element, allowing it to flexibly respond to the impact force of the cooling oil and the centrifugal force of the rotating shaft during operation, automatically adjusting its position and spraying cooling oil. This dynamic spraying design ensures a timely supply of cooling oil, keeping the bearing in a consistently well-cooled environment during operation. When the motor stops, the elastic element causes the nozzle to retract to the guide section, preventing cooling oil leakage and waste, while also reducing the possibility of nozzle contamination and ensuring efficient resource utilization.

[0021] Furthermore, the innovative design of the passive contact mechanism enhances the functionality of the cooling system. An end cover is installed within the motor housing, and the rotating shaft rotatably engages with the end cover, allowing the first and second spray channels of the nozzle to effectively spray cooling oil into the gap between the balls and the inner ring shaft. This design not only directly cools the bearing but also applies a thrust towards the outer ring shaft through a portion of the sprayed cooling oil, ensuring tight contact between the insulating sleeve and the outer ring shaft. Thus, the spraying of cooling oil not only provides cooling but also enhances the tight fit between the rolling bearing and the nano-insulated bearing sleeve through physical contact, effectively delaying further widening of the gap. This allows the rolling bearing to maintain good insulation performance for a longer period while reducing the possibility of current flowing through the bearing. Ultimately, this solves the problem of damage easily occurring between the rotor and the rolling bearing. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 These are schematic diagrams of the structure of some embodiments of this application;

[0024] Figure 2 These are partial cross-sectional views of some embodiments of this application;

[0025] Figure 3 yes Figure 2 Enlarged view of part A in the image;

[0026] Figure 4 This is a partial schematic diagram used to show the nozzle.

[0027] The diagram is marked as follows:

[0028] 1. Motor housing; 11. Stator; 12. Rotating shaft; 121. Guide section; 122. Guide cavity; 123. Stepped surface; 124. Circular oil baffle; 13. End cap; 131. Outlet pipe; 14. Recovery tank; 141. Filter screen; 2. Rolling bearing; 21. Inner ring shaft; 22. Outer ring shaft; 23. Ball bearing; 3. Nano-insulated bearing sleeve; 4. Oil injection mechanism; 41. Nozzle; 411. First injection channel; 412. Second injection channel; 413. Drainage Cavity; 414, First connecting part; 415, Second connecting part; 42, Flow pipe; 43, First oil pump; 44, Oil storage tank; 441, Return pipe; 442, Second oil pump; 5, Elastic element; 6, Passive abutment mechanism; 7, Pressure-bearing assembly; 71, First annular plate; 72, First spring; 8, Rotating assembly; 81, L-shaped rod; 82, First abutment ball; 83, Second abutment ball; 9, Abutment assembly; 91, Second annular plate; 92, Second spring; 10, Telescopic rod. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0030] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0031] Among related technologies, high-voltage permanent magnet motors are widely used in industrial and energy fields, favored for their ability to output greater power in a smaller size and weight. The core technology of these motors lies in using permanent magnets to generate a stable magnetic field, thereby efficiently converting electrical energy into mechanical energy. The structure of a high-voltage permanent magnet motor mainly includes a stator, a rotor, and permanent magnets. The stator consists of windings that generate a rotating magnetic field when energized, while the rotor, embedded with permanent magnets, relies on the magnetic field generated by the stator to achieve rotational motion. This design enables high-voltage permanent magnet motors to operate stably under high speed and high load conditions, and they are widely used in power systems, rail transportation, and large-scale machinery.

[0032] However, through long-term practice, the applicant discovered that the damage between the rotor and bearings of the high-voltage permanent magnet motor became increasingly significant after prolonged operation. This problem mainly stems from the high shaft voltage under the working environment and conditions. Specifically, the presence of shaft voltage leads to shaft current between the rotor and bearings, which in turn triggers a discharge phenomenon. This discharge not only increases frictional losses but also causes a sharp rise in temperature between the rotor and bearings, ultimately leading to overheating and damage to the bearings.

[0033] High temperatures have multifaceted effects on bearings. First, prolonged exposure to high temperatures can alter the physical properties of bearing materials, leading to a decrease in their strength and wear resistance. Second, increased temperature accelerates the deterioration of lubricating oil, reducing its lubricating effect and further increasing friction and wear. Furthermore, overheated bearings can cause lubricating oil evaporation and leakage, creating a more severe cycle and ultimately leading to bearing failure.

[0034] Furthermore, the applicant observed that metal powder is generated during long-term operation of the bearing, and this powder gradually accumulates and forms gaps due to the contact force between the bearing balls and the outer ring. As operating time increases, these gaps widen, making it easier for metal powder to enter between the nano-insulated bearing sleeve and the bearing. This not only further exacerbates wear but also significantly reduces the insulation performance of the nano-insulated bearing sleeve, allowing current to pass through more easily and potentially damaging internal components of the motor.

[0035] In summary, the current background technology of high-voltage permanent magnet motors has several significant drawbacks:

[0036] High temperature-induced bearing damage: Due to the effect of shaft voltage, bearings are prone to overheating, which affects their performance and lifespan.

[0037] Accumulation of metal powder: Metal powder generated during long-term operation can enter between the bearing and the nano-insulated bearing sleeve, causing wear and gaps, which in turn affects the insulation performance.

[0038] Reduced insulation performance: Due to the intrusion of metal powder and bearing damage, the insulation performance of nano-insulated bearing sleeves may be significantly reduced, increasing the risk of motor failure.

[0039] Therefore, current high-voltage permanent magnet motors face the dual challenges of insufficient high-temperature resistance of bearings and reduced insulation performance in their design and application. Optimization of bearing structure, materials, and cooling systems is urgently needed to improve their overall performance and reliability. The discovery of this technical problem provides direction for subsequent improvements and lays the foundation for the design of new high-voltage permanent magnet motors. Technological innovations addressing these issues will help improve motor efficiency, extend service life, and ensure reliable operation of high-voltage permanent magnet motors in various applications.

[0040] Based on this, this application provides a high-voltage permanent magnet motor with nano-insulated bearings. Please refer to... Figures 1-4 The nano-insulated bearing high-voltage permanent magnet motor includes a motor housing 1, a rolling bearing 2, an oil injection mechanism 4, an elastic element 5, and a passive contact mechanism 6; wherein, a stator 11 is rotatably provided inside the motor housing 1, and a rotating shaft 12 extending partially to the outside of the motor housing 1 is coaxially provided at one end of the stator 11.

[0041] Meanwhile, the rolling bearing 2 includes an inner ring shaft 21, an outer ring shaft 22, and balls 23. The outer ring shaft 22 is coaxially arranged around the inner ring shaft 21. Multiple balls 23 are rotatably arranged between the inner ring shaft 21 and the outer ring shaft 22. A bearing chamber is provided on the side wall of the motor housing 1. The outer ring shaft 22 is embedded in the bearing chamber and is fitted with a nano-insulated bearing sleeve 3. The rotating shaft 12 passes through the inner ring shaft 21 and is interference-fitted with the inner ring of the inner ring shaft 21.

[0042] Furthermore, the fuel injection mechanism 4 includes a nozzle 41, a flow pipe 42, a first fuel pump 43, and a fuel tank 44. An axial fuel supply chamber is provided within the rotating shaft 12, and the flow pipe 42 is disposed within the fuel supply chamber. The fuel tank 44 is located on one side of the motor housing 1. The first fuel pump 43 is mounted on the fuel tank 44, and its inlet end is connected to the interior of the fuel tank 44. One end of the flow pipe 42 is rotatably connected to the outlet end of the first fuel pump 43, and the other end extends into the fuel supply chamber. For example, a connecting pipe is provided at the outlet end of the first fuel pump 43. The flow pipe 42 is straight, and one end of the flow pipe 42 is coaxial with the connecting pipe, and they are rotatably connected via a rotary joint. Furthermore, the rotating shaft 12 is provided with a guide portion 121, which has a guide cavity 122 that communicates with the oil supply channel. The guide portion 121 is perpendicular to the rotating shaft 12 and at least two sets are arranged in the circumference of the rotating shaft 12. The nozzle 41 is movably installed in the guide portion 121 and communicates with the other end of the flow pipe 42.

[0043] Meanwhile, the elastic element 5 is installed between the nozzle 41 and the guide portion 121. The elastic element 5 makes the nozzle 41 tend to move into the guide portion 121. When the first oil pump 43 starts and the rotating shaft 12 rotates, the nozzle 41 is partially pushed out of the guide portion 121 under the combined action of the impact force of the cooling oil entering the nozzle 41 and the centrifugal force when the rotating shaft 12 rotates. When the first oil pump 43 is turned off and the rotating shaft 12 stops rotating, the nozzle 41 retracts into the guide portion 121 under the elastic force of the elastic element 5.

[0044] For example, an end cover 13 is provided inside the motor housing 1 and near the rolling bearing 2. The rotating shaft 12 passes through the end cover 13 and is rotatably engaged with the end cover 13. The guide part 121 is located inside the end cover 13. The nozzle 41 has a first spray channel 411 and a second spray channel 412. Both the first spray channel 411 and the second spray channel 412 are connected to the flow pipe 42. After the nozzle 41 moves out of the guide part 121, the spray nozzle of the first spray channel 411 faces the gap between the ball 23 and the inner ring shaft 21. After the nozzle 41 moves out of the guide part 121, the spray nozzle of the second spray channel 412 faces the passive abutment mechanism 6. Under the action of the cooling oil sprayed from the second spray channel 412, the passive abutment mechanism 6 applies a thrust toward the outer ring shaft 22 to the nano-insulated bearing sleeve 3 so that the nano-insulated bearing sleeve 3 is pressed against the outer ring shaft 22. For example, the bend in the flow pipe 42 where it enters the guide portion 121 from the rotating shaft 12 is a smooth transition bend, which can greatly reduce the flow resistance of the cooling oil when it flows into the nozzle 41.

[0045] Based on this, firstly, the motor's structural design includes the motor housing 1, stator 11, and rotating shaft 12, ensuring efficient operation of the motor within a compact space. The coaxial design of the rotating shaft 12 allows the motor to maintain good balance and stability while outputting power. This design provides space for subsequent cooling and lubrication systems, enabling effective thermal management, thereby reducing bearing temperature and extending their service life.

[0046] Secondly, the selection of the rolling bearing 2 and its combination with the nano-insulated bearing sleeve 3 significantly improves the insulation performance of the motor. The outer ring shaft 22 is embedded in the bearing chamber of the motor housing 1 and fitted with the nano-insulated bearing sleeve 3, effectively isolating the current and reducing discharge phenomena caused by current passing through the bearing. This configuration not only reduces the risk of damage to the internal components of the motor by current, but also improves the overall efficiency of the motor by reducing frictional losses. At the same time, the nano-insulating material has excellent high-temperature resistance, further ensuring the stability of the motor in high-temperature environments.

[0047] The oil injection mechanism 4 provides the necessary cooling solution for the motor. The oil injection mechanism 4 includes a nozzle 41, a flow pipe 42, a first oil pump 43, and an oil reservoir 44. By providing an oil supply channel, cooling oil is guided from the oil reservoir 44 to the bearing area. During motor operation, the first oil pump 43 delivers cooling oil to the nozzle 41, ensuring that the cooling oil effectively covers the bearing and carries away excess heat. This mechanism significantly reduces the bearing temperature, thereby preventing material performance degradation and wear caused by high temperatures and enhancing the reliability of the bearing.

[0048] The nozzle 41 is designed in conjunction with the elastic element 5, allowing it to flexibly respond to the impact force of the cooling oil and the centrifugal force of the rotating shaft 12 during operation, automatically adjusting its position and spraying cooling oil. This dynamic oil spraying design ensures timely supply of cooling oil, keeping the bearing in a good cooling environment during operation. When the motor stops, the elastic element 5 causes the nozzle 41 to retract to the guide portion 121, preventing cooling oil leakage and waste, while reducing the possibility of nozzle 41 becoming contaminated, ensuring efficient resource utilization.

[0049] Furthermore, the innovative design of the passive contact mechanism 6 enhances the functionality of the cooling system. An end cap 13 is provided within the motor housing 1, and the rotating shaft 12 rotatably engages with the end cap 13, enabling the first spray channel 411 and the second spray channel 412 of the nozzle 41 to effectively spray cooling oil into the gap between the ball bearing 23 and the inner ring shaft 21. This design not only directly cools the bearing but also applies a thrust towards the outer ring shaft 22 through a portion of the sprayed cooling oil, ensuring close contact between the insulating sleeve and the outer ring shaft 22. Thus, the spraying of cooling oil not only provides cooling but also enhances the tight fit between the rolling bearing 2 and the nano-insulated bearing sleeve 3 through physical contact, effectively delaying further widening of the gap. This allows the rolling bearing 2 to maintain good insulation performance for a long period while reducing the possibility of current flowing through the bearing.

[0050] In summary, the nano-insulated bearing high-voltage permanent magnet motor proposed in this invention solves the operational challenges of high-voltage permanent magnet motors under high-temperature and high-load environments through comprehensive optimization of its structure and function. This motor not only improves overall efficiency and stability but also extends its service life and reduces maintenance costs. Innovations in the cooling system, lubrication system, and insulation design significantly enhance the motor's operational safety and reliability, enabling it to exhibit superior performance in complex industrial applications. This technological advancement not only drives the development of the motor field but also provides important reference and guidance for the future design of high-voltage permanent magnet motors.

[0051] In some implementations, such as Figures 2-4 As shown, the nozzle 41 also has a drainage channel 413, which has a first end and a second end. The first end of the drainage channel 413 is connected to both the first spray channel 411 and the second spray channel 412, and the second end is connected to the flow pipe 42. The inner diameter of the drainage channel 413 gradually decreases from the first end to the second end. For example, the spray nozzles of the first spray channel 411 and the second spray channel 412 face opposite directions, and both the first spray channel 411 and the second spray channel 412 are arc-shaped and curved towards their opposite sides. Further, the inner diameter of the first spray channel 411 gradually increases from the end near the drainage channel 413 to the spray nozzle of the first spray channel 411, and the inner diameter of the second spray channel 412 gradually decreases from the end near the drainage channel 413 to the spray nozzle of the second spray channel 412.

[0052] This design allows the cooling oil in the guide channel 413 to be adequately guided and flowed before being sprayed, ensuring that the cooling oil enters the first spray channel 411 and the second spray channel 412 at an appropriate flow rate and pressure. The gradually decreasing inner diameter of the guide channel 413 helps to create a certain acceleration effect when the cooling oil flows through it, thereby increasing the kinetic energy during spraying and enhancing the effect of the nozzle 41 in spraying cooling oil.

[0053] In addition, the arc-shaped design of the first injection channel 411 and the second injection channel 412 makes the cooling oil more uniform during the injection process, reduces the problem of uneven cooling caused by local injection, and ensures that most of the cooling oil can reach the high-temperature core area, that is, the gap between the ball 23 and the inner ring shaft 21, so that it can be cooled in time, reducing material fatigue and damage caused by overheating.

[0054] It is worth noting that the inner diameter of the first injection channel 411 gradually increases from one end near the drainage channel 413 to the injection port. This design helps to appropriately reduce the flow rate of the cooling oil and increase its flow rate before injection, thereby enhancing the coverage area of ​​the cooling oil in the gap between the ball bearing 23 and the inner ring shaft 21 and improving the cooling effect. Meanwhile, the inner diameter of the second injection channel 412 gradually decreases, creating a converging effect at the injection port. This combination of structures allows the cooling oil to be injected onto the passive contact mechanism 6 at a higher speed and pressure. This results in a greater impact force from the injected cooling oil, thereby enhancing the tight fit between the outer ring shaft 22 of the rolling bearing 2 and the nano-insulated bearing sleeve 3 through physical contact, effectively preventing further widening of the gap. Furthermore, this structure also has the advantage of allowing for a larger flow rate and lower velocity in the first injection channel 411, preventing excessive impact force from damaging the gap between the ball bearing 23 and the inner ring shaft 21. Increasing the flow rate of the second injection channel 412 is to provide a sufficiently large impact force to cause the passive contact mechanism 6 to move without needing to consider damage. Therefore, achieving the flow rate requirements of both cooling oils on the same nozzle 41 is more conducive to spatial arrangement and suitable for the relatively small space inside the permanent magnet motor.

[0055] In some implementations, such as Figures 2-4 As shown, the connection between the first injection channel 411 and the drainage channel 413 is configured as a first connecting portion 414, and the connection between the second injection channel 412 and the drainage channel 413 is configured as a second connecting portion 415. Both the first connecting portion 414 and the second connecting portion 415 are located within the projection of the cross-section of the drainage channel 413. For example, the inner diameter of the first connecting portion 414 is larger than the inner diameter of the second connecting portion 415.

[0056] Based on this, firstly, the inner diameter of the first connecting part 414 is larger than the inner diameter of the second connecting part 415. This design allows the cooling oil to flow at a reduced velocity and increase in volume when flowing into the first injection channel 411, thereby effectively expanding the coverage area of ​​the cooling oil in the gap between the ball bearing 23 and the inner ring shaft 21. This improvement enhances the cooling effect, ensuring sufficient cooling for the bearing and reducing the risk of wear due to overheating. On the other hand, the smaller inner diameter of the second connecting part creates a converging effect at the injection port, allowing the cooling oil to be sprayed at a higher speed and pressure to the passive contact mechanism 6 after entering the second injection channel 412. This impact not only improves the spray efficiency of the cooling oil but also enhances the tight fit between the outer ring shaft 22 of the rolling bearing 2 and the nano-insulated bearing sleeve 3 through physical contact, effectively preventing further expansion of the gap. This design combination enables the entire cooling system to play a more efficient cooling and insulation role in the high-voltage permanent magnet motor, thereby improving the reliability and service life of the motor.

[0057] In some implementations, such as Figures 2-4 As shown, the elastic element 5 includes a compression spring. The portion of the flow pipe 42 connected to the nozzle 41 is a telescopic tube section, and the compression spring is sleeved on the outside of the telescopic tube section. For example, the inner wall of the guide cavity 122 is provided with a stepped surface 123, one end of the compression spring is connected to the stepped surface 123, and the other end is connected to the end of the nozzle 41.

[0058] Based on this, the compression spring ensures that the nozzle 41 maintains stable pressure and position during cooling oil injection. When the first oil pump 43 starts and the rotating shaft 12 rotates, the combined effect of the cooling oil flow and centrifugal force partially extends the nozzle 41. This process is regulated by the compression spring, ensuring that the nozzle 41 can smoothly and accurately aim at the target area during injection. Simultaneously, by providing a telescopic section on the flow pipe 42, the range of motion of the nozzle 41 is expanded, allowing it to flexibly adapt to the dynamic changes of the rotating shaft 12 during injection and adaptively extend within the guide portion 121 while maintaining communication with the flow pipe 42. This design not only improves the flexibility and coverage of the injection but also ensures that the cooling oil is evenly sprayed onto all key parts of the rolling bearing 2, effectively improving the cooling effect.

[0059] Furthermore, the connection design between the stepped surface 123 of the guide cavity 122 and the compression spring further enhances the stability of the system. When the nozzle 41 moves under the action of the elastic element 5, the stepped surface 123 effectively limits the range of motion of the nozzle 41, preventing it from deviating excessively from the preset position and ensuring spray accuracy and consistency. This structural optimization allows the cooling oil to form a relatively stable flow state during the spraying process.

[0060] For example, the guide portion 121 is provided with an anti-detachment flange (not shown in the figure) at the opening edge of the guide cavity 122, and the outer side wall of the nozzle 41 is provided with an anti-detachment protrusion (not shown in the figure) that abuts against the anti-detachment flange, thereby preventing the nozzle 41 from completely detaching from the guide portion 121 and improving the connection stability between the two.

[0061] In some implementations, reference is made to Figures 2-4 The passive contact mechanism 6 includes a pressure-bearing component 7, a rotating component 8, and a contact component 9. The rotating component 8 is movably disposed on the inner wall of the end cover 13. The pressure-bearing component 7 and the contact component 9 are respectively disposed at both ends of the rotating component 8. When the nozzle 41 is partially pushed out from the guide part 121 under the combined action of the impact force of the cooling oil entering the nozzle 41 and the centrifugal force when the rotating shaft 12 rotates, the cooling oil sprayed from the spray port of the second spray channel 412 will directly spray onto the pressure-bearing component 7 and apply an impact force to the pressure-bearing component 7. This will drive the rotating component 8 to rotate and drive the contact component 9 to abut against the nano-insulated bearing sleeve 3, so that the nano-insulated bearing sleeve 3 is pressed against the outer ring shaft 22 after being subjected to force.

[0062] For example, the pressure-bearing component 7 includes a first annular plate 71 and a first spring 72. The first annular plate 71 is connected to the inner wall of the end cap 13 via the first spring 72. Along the axial direction of the rotation shaft 12, the annular surface of the first annular plate 71 is always directly opposite the injection port of the second injection channel 412 of the removal guide portion 121. Meanwhile, the abutment component 9 includes a second annular plate 91 and a second spring 92. The second annular plate 91 is connected to the inner wall of the end cap 13 via the second spring 92. Along the axial direction of the rotation shaft 12, the annular surface of the second annular plate 91 is always in contact with the side surface of the nano-insulated bearing sleeve 3.

[0063] Furthermore, the rotating assembly 8 includes an L-shaped rod 81, a first abutting ball 82, and a second abutting ball 83. The bent portion of the L-shaped rod 81 is rotatably connected to the inner wall of the end cap 13. The first abutting ball 82 is located at one end of the L-shaped rod 81 and is used to slide against the surface of the first annular plate 71 away from the nozzle 41. The second abutting ball 83 is located at the other end of the L-shaped rod 81 and is used to slide against the surface of the second annular plate 91 away from the nano-insulated bearing sleeve 3. When the first annular plate 71 is impacted by cooling oil, it pushes the first abutting ball 82, driving the L-shaped rod 81 to rotate under force, so that the second abutting ball 83 pushes the second annular plate 91 to abut against the side of the nano-insulated bearing sleeve 3. For example, the L-shaped rod can also be configured as a V-shape; the specific shape can be determined according to the on-site installation conditions. It is worth noting that the nozzle 41 is configured as a high-pressure nozzle 41, which makes the impact force of the cooling oil ejected from the second chamber greater than the centrifugal force. This makes the cooling oil ejected from the second chamber less susceptible to the influence of centrifugal force and thus less likely to deviate.

[0064] Based on this, firstly, the pressure-bearing component 7 is composed of a first annular plate 71 and a first spring 72. The first spring 72 is connected to the inner wall of the end cap 13 to form a flexible support structure. The annular surface of the first annular plate 71 is always aligned with the injection port of the second injection channel 412. This design ensures that each time the cooling oil from the second injection channel 412 is injected, the injected cooling oil can effectively and directly impact the first annular plate 71, thereby transmitting the impact force to the pressure-bearing component 7.

[0065] When the cooling oil is sprayed out through the second injection channel 412, its impact force and the centrifugal force of the rotating shaft 12 work together to drive the pressure-bearing component 7 to move. After being impacted by the cooling oil, the first annular plate 71 pushes the first abutting ball 82, causing the L-shaped rod 81 in the rotating component 8 to rotate. The movement of the L-shaped rod 81 will further drive the second abutting ball 83, thereby applying force to the second annular plate 91. The second annular plate 91 is connected to the inner wall of the end cap 13 through the second spring 92 and is always in contact with the side of the nano-insulated bearing sleeve 3. This movement mechanism ensures that the nano-insulated bearing sleeve 3 can tightly abut against the outer ring shaft 22 after being subjected to force, reducing the risk of insulation performance degradation due to gaps.

[0066] Through this design, the cooling oil not only serves a cooling function but also enhances the mobility and reliability of the rotating component 8 through direct physical contact. The impact force generated by the spraying of the cooling oil allows each component to respond quickly, thereby achieving instant adjustment and tightening of the nano-insulated bearing sleeve 3. In practical applications of high-voltage permanent magnet motors, especially under high load and high speed conditions, this dynamic adjustment mechanism can effectively prevent the widening of the gap between the rolling bearing 2 and the nano-insulated bearing sleeve 3 caused by thermal expansion and prolonged operation.

[0067] Furthermore, the L-shaped rod 81 structure of the rotating component 8 makes the force transmission between the pressure component 7 and the contact component 9 more efficient, reducing energy loss. In addition, this design can accommodate the minute movements that the bearing may generate during operation, thereby maintaining tight contact between the nano-insulated bearing sleeve 3 and the outer ring shaft 22, ensuring that the insulation performance is not compromised. This combination not only improves the operating efficiency of the motor but also enhances its stability and reliability under complex operating conditions.

[0068] In some implementations, reference is made to Figures 3-4Both the first spring 72 and the second spring 92 have telescopic rods 10 in their inner rings. The telescopic direction of the two telescopic rods 10 is parallel to the axial direction of the rotating shaft 12, and one end of the telescopic rod 10 is connected to the inner sidewall of the end cover 13, while the other end is connected to the first annular plate 71 and the second annular plate 91. This arrangement significantly improves the operational stability of the first annular plate 71 and the second annular plate 91 along the axial direction of the rotating shaft 12 by incorporating telescopic rods 10 in the inner rings of the first spring 72 and the second annular plate 92. The design of the telescopic rods 10, with their telescopic direction parallel to the axial direction of the rotating shaft 12, effectively prevents radial displacement between the first annular plate 71 and the second annular plate 91, ensuring that the first annular plate 71 remains aligned with the injection port of the second injection channel 412, and that the second annular plate 91 remains in contact with the side of the nano-insulated bearing sleeve 3.

[0069] In some implementations, such as Figure 1 , 2 As shown, the lowest end of the end cap 13 is provided with an outflow pipe 131, and a recovery tank 14 is provided on one side of the motor housing 1. The end of the outflow pipe 131 away from the end cap 13 opens towards the upper opening of the recovery tank 14. This arrangement allows the sprayed cooling oil to flow quickly out through the outflow pipe 131 to the recovery tank 14, avoiding the retention and potential contamination of cooling oil inside the motor housing 1. This design not only effectively prevents the accumulation of cooling oil but also reduces the risk of failure caused by oil buildup, ensuring the reliability of the motor during long-term operation. Furthermore, the opening of the outflow pipe 131 away from the end cap 13 towards the upper opening of the recovery tank 14 forms an effective return system, promoting the recycling of cooling oil. Through this design, a closed loop is formed in the processes of spraying, recovery, and reuse of cooling oil, which helps reduce energy consumption and minimize the waste of cooling oil.

[0070] In some implementations, combined with Figure 1 , 2 The recovery tank 14 is equipped with a filter screen 141, which divides the recovery tank 14 into an upper storage chamber and a lower storage chamber. Metal powder in the cooling oil is held in the upper storage chamber by the filter screen 141. For example, a return pipe 441 connects the oil storage tank 44 and the lower storage chamber. A second oil pump 442 is installed on the return pipe 441 to pump the cooling oil from the lower storage chamber into the oil storage tank 44. Based on this, the filter screen 141 effectively blocks and collects metal powder and impurities in the cooling oil during the recovery process. This design not only prevents metal powder from circulating in the cooling oil, avoiding further wear on the internal components of the motor, but also ensures the purity of the cooling oil, thereby improving the cooling effect and the service life of the rolling bearing 2.

[0071] The upper storage chamber is designed to allow collected metal powder to deposit there, preventing it from re-entering the cooling system and reducing the risk of malfunctions caused by impurities. Simultaneously, the return pipe 441 between the lower storage chamber and the oil tank 44, along with the use of the second oil pump 442, allows the cooling oil in the lower storage chamber to be quickly extracted and pumped back to the oil tank 44, achieving efficient circulation of the cooling oil. This closed-loop system not only improves the efficiency of cooling oil use but also reduces cooling oil consumption, thereby reducing operating costs.

[0072] This multi-layered cooling oil management system ensures stable temperature control and efficient heat dissipation during long-term operation, guaranteeing the motor's safety and reliability. Furthermore, the system facilitates motor maintenance, allowing operators to easily monitor and manage the cooling oil's condition, thereby further improving the overall performance and lifespan of the equipment.

[0073] In some implementations, reference is made to Figure 1 , 2 A circular oil baffle 124 is coaxially mounted on the portion of the rotating shaft 12 located outside the motor housing 1. The outer diameter of the circular oil baffle 124 is larger than the outer diameter of the rolling bearing 2, and the gap between the circular oil baffle 124 and the motor housing 1 is located directly above the upper opening of the recovery tank 14. With this configuration, during operation, after the cooling oil is sprayed into the gap between the ball bearing 23 and the inner ring shaft 21 through the spray nozzle of the first spray channel 411, it is highly likely to leak out from the side outside the motor housing 1. The presence of the circular oil baffle 124 guides the unused cooling oil back to the recovery tank 14, preventing waste. This design effectively reduces cooling oil loss, improves motor operating efficiency, and creates conditions for the recycling of cooling oil. Simultaneously, the circular oil baffle 124 also acts as a physical isolation, protecting other components of the motor from the impact of splashing cooling oil, thereby reducing potential failure risks. Overall, this design not only optimizes the performance of the cooling system but also improves the reliability and safety of the motor, ensuring stable operation under high pressure and high load conditions.

[0074] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A nanometer insulated bearing high-voltage permanent magnet motor, characterized in that, The utility model relates to a kind of motor and its oil injection mechanism, including: Motor housing (1), the inside rotation of the motor housing (1) is equipped with stator (11), and one end of the stator (11) is coaxially equipped with rotating shaft (12) extending to the outside of the motor housing (1); Rolling bearing (2), including inner ring shaft (21), outer ring shaft (22) and ball (23), the outer ring shaft (22) is coaxially arranged on the periphery of the inner ring shaft (21), the ball (23) is rotatably arranged between the inner ring shaft (21) and outer ring shaft (22), the sidewall of the motor housing (1) is provided with bearing chamber, the outer ring shaft (22) is embedded in the bearing chamber, and the outer ring shaft (22) is sleeved with nano insulation bearing sleeve (3), the rotating shaft (12) passes through the inner ring shaft (21) and is in interference fit with the inner ring of the inner ring shaft (21); Oil injection mechanism (4), including nozzle (41), flow pipe (42), first oil pump (43) and oil tank (44), the rotating shaft (12) is axially provided with oil supply channel, the flow pipe (42) is arranged in the oil supply channel, the oil tank (44) is arranged on one side of the motor housing (1), the first oil pump (43) is mounted on the oil tank (44), and the pump inlet end of the first oil pump (43) is communicated with the inside of the oil tank (44), one end of the flow pipe (42) is rotatably communicated with the pump outlet end of the first oil pump (43), and the other end extends into the oil supply channel, the rotating shaft (12) is provided with guide part (121), the guide part (121) has guide inner cavity (122) communicated with the oil supply channel, the guide part (121) is perpendicular to the rotating shaft (12) and is arranged in the circumferential direction of the rotating shaft (12) at least two groups, the nozzle (41) is movably installed in the guide part (121) and communicated with the other end of the flow pipe (42); Elastic member (5) is installed between nozzle (41) and guide part (121), the elastic member (5) makes the nozzle (41) have the tendency of moving into the guide part (121), when the first oil pump (43) is started and the rotating shaft (12) rotates, the nozzle (41) is partially pushed out from the guide part (121) under the double action of the impact force of cooling oil entering the nozzle (41) and the centrifugal force when the rotating shaft (12) rotates, when the first oil pump (43) is closed and the rotating shaft (12) stops rotating, the nozzle (41) is retreated into the guide part (121) under the action of the elastic force of the elastic member (5). The passive abutting mechanism (6) is provided in the motor housing (1) and close to the rolling bearing (2), an end cover (13) is provided close to the rolling bearing (2), the rotating shaft (12) passes through the end cover (13) and is in rotation fit with the end cover (13), the guide part (121) is located in the end cover (13), the nozzle (41) has a first spraying channel (411) and a second spraying channel (412), the first spraying channel (411) and the second spraying channel (412) are both communicated with the flow pipe (42), the spraying port of the first spraying channel (411) is directed to the gap between the ball (23) and the inner ring shaft (21) after the nozzle (41) moves out of the guide part (121), the spraying port of the second spraying channel (412) is directed to the passive abutting mechanism (6) after the nozzle (41) moves out of the guide part (121), the passive abutting mechanism (6) applies a pushing force to the nano-insulating bearing sleeve (3) towards the outer ring shaft (22) under the action of the cooling oil sprayed by the second spraying channel (412), so that the nano-insulating bearing sleeve (3) is abutted to the outer ring shaft (22).

2. A nanometer insulated bearing high-voltage permanent magnet motor according to claim 1, characterized in that, The nozzle (41) further has a drainage channel (413), the drainage channel (413) has a first end and a second end, the first end of the drainage channel (413) is communicated with the first spraying channel (411) and the second spraying channel (412) at the same time, the second end is communicated with the flow pipe (42), and the inner diameter of the drainage channel (413) gradually decreases from the first end to the second end; The spraying ports of the first spraying channel (411) and the second spraying channel (412) are respectively directed to opposite directions, the first spraying channel (411) and the second spraying channel (412) are both arc-shaped and curved to opposite sides, wherein, The inner diameter of the first spraying channel (411) gradually increases from one end close to the drainage channel (413) to the spraying port of the first spraying channel (411), and the inner diameter of the second spraying channel (412) gradually decreases from one end close to the drainage channel (413) to the spraying port of the second spraying channel (412).

3. A nano-insulation bearing high-voltage permanent magnet motor according to claim 2, characterized in that, The communication part of the first spraying channel (411) and the drainage channel (413) is configured as a first communication part (414), the communication part of the second spraying channel (412) and the drainage channel (413) is configured as a second communication part (415), and the first communication part (414) and the second communication part (415) are both located in the projection of the cross section of the drainage channel (413), wherein, The inner diameter of the first communication part (414) is greater than the inner diameter of the second communication part (415).

4. A nanometer insulated bearing high-voltage permanent magnet motor according to claim 1, characterized in that, The elastic member (5) includes a compression spring, the part of the flow pipe (42) connected with the nozzle (41) is a telescopic pipe segment, and the compression spring is sleeved outside the telescopic pipe segment; The inner side wall of the guide inner cavity (122) is provided with a stepped surface (123), one end of the compression spring is connected with the stepped surface (123), and the other end is connected with the end part of the nozzle (41).

5. A nano-insulation bearing high voltage permanent magnet motor according to claim 2, characterized in that, The passive abutting mechanism (6) comprises a pressure receiving component (7), a rotating component (8) and an abutting component (9), the rotating component (8) is movably arranged on the inner wall of the end cover (13), the pressure receiving component (7) and the abutting component (9) are respectively arranged on both ends of the rotating component (8), wherein, When the nozzle (41) is partially pushed out from the guide part (121) under the double actions of the impact force of the cooling oil into the nozzle (41) and the centrifugal force of the rotating shaft (12), the cooling oil sprayed from the spraying port of the second spraying channel (412) will directly spray on the pressure receiving component (7) and apply an impact force to the pressure receiving component (7), and then drive the rotating component (8) to rotate and drive the abutting component (9) to abut on the nano-insulating bearing sleeve (3), so that the nano-insulating bearing sleeve (3) is tightly abutted on the outer ring shaft (22) under the force.

6. A nano-insulation bearing high voltage permanent magnet motor according to claim 5, characterized in that, The pressure receiving component (7) comprises a first annular plate (71) and a first spring (72), the first annular plate (71) is connected with the inner wall of the end cover (13) through the first spring (72), and the annular plate surface of the first annular plate (71) is always opposite to the spraying port of the second spraying channel (412) moving out of the guide part (121) along the axis direction of the rotating shaft (12); The abutting component (9) comprises a second annular plate (91) and a second spring (92), the second annular plate (91) is connected with the inner wall of the end cover (13) through the second spring (92), and the annular plate surface of the second annular plate (91) is always fitted with the side surface of the nano-insulating bearing sleeve (3) along the axis direction of the rotating shaft (12); The rotating component (8) comprises an L-shaped rod (81), a first abutting ball (82) and a second abutting ball (83), the bending part of the L-shaped rod (81) is rotationally connected with the inner wall of the end cover (13), the first abutting ball (82) is arranged at one end of the L-shaped rod (81) and is used for slidingly abutting with the plate surface of the first annular plate (71) away from the nozzle (41), and the second abutting ball (83) is arranged at the other end of the L-shaped rod (81) and is used for slidingly abutting with the plate surface of the second annular plate (91) away from the nano-insulating bearing sleeve (3), wherein, After the first annular plate (71) is impacted by the cooling oil, the first abutting ball (82) is pushed to drive the L-shaped rod (81) to rotate under the force, so that the second abutting ball (83) pushes the second annular plate (91) to abut on the side surface of the nano-insulating bearing sleeve (3).

7. A nano-insulation bearing high voltage permanent magnet motor according to claim 6, characterized in that, The inner rings of the first spring (72) and the second spring (92) are respectively provided with an expansion rod (10), the expansion directions of the two expansion rods (10) are parallel to the axis direction of the rotating shaft (12), and one end of the expansion rod (10) is connected with the inner wall of the end cover (13) and the other end is connected with the first annular plate (71) and the second annular plate (91).

8. A nanosealed high voltage permanent magnet electric machine according to any of claims 1-7, characterized in that, The lowest end of the end cover (13) is provided with an outflow pipe (131), one side of the motor shell (1) is provided with a recovery tank (14), and the outflow pipe (131) is open at one end away from the end cover (13) and faces the upper end opening of the recovery tank (14).

9. A nano-insulation bearing high voltage permanent magnet motor according to claim 8, characterized in that, The recovery tank (14) is provided with a residue filter plate (141), which divides the recovery tank (14) into an upper storage cavity and a lower storage cavity, and the metal powder in the cooling oil stays in the upper storage cavity under the blocking action of the residue filter plate (141). The oil storage tank (44) and the lower storage cavity are communicated through a backflow pipe (441), the backflow pipe (441) is provided with a second oil pump (442), and the second oil pump (442) is used for pumping the cooling oil in the lower storage cavity into the oil storage tank (44).

10. A nano-insulation bearing high voltage permanent magnet motor according to claim 8, characterized in that, The part of the rotating shaft (12) outside the motor shell (1) is coaxially provided with a circular oil baffle (124), the outer diameter of the circular oil baffle (124) is greater than the outer diameter of the rolling bearing (2), and the gap between the circular oil baffle (124) and the motor shell (1) is located directly above the upper end opening of the recovery tank (14).

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