Oil-cooled motor rotor magnetic steel or core sealing temperature measuring method

Abstract

The application relates to a kind of oil-cooled motor rotor magnetic steel or core sealing temperature measuring methods, and relates to the field of new energy automobile motor.The technical scheme pre-burys the thermocouple temperature measuring head of temperature measuring thermocouple on the magnetic steel or core of rotor;Line hole is opened to the end plate of rotor, and the thermocouple wire of temperature measuring thermocouple is worn out from line hole;Line groove is opened along the axial direction of rotating shaft, and shaft sleeve is installed between oil seal and rotating shaft;Thermocouple wire worn out from line hole is directionally laid along line groove, and after passing through from the inside of shaft sleeve, it is connected with remote sensing temperature measuring device, so that remote sensing temperature measuring device obtains the real-time temperature of magnetic steel or core;Thermocouple wire in line groove is fixed by using oil-resistant sealant;When rotating shaft drives rotor to rotate, the sealing lip of shaft sleeve periphery and oil seal is closely combined, and rotating sealing interface is formed.Under this condition, while ensuring the sealing of oil-cooled motor cooling cavity, the real-time temperature of rotor magnetic steel or core under various working conditions is accurately measured.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle motor technology, and in particular to a method for sealing and measuring the temperature of oil-cooled motor rotor magnets or iron cores. Background Technology

[0002] Against the backdrop of the booming development of the new energy vehicle industry, the demand for miniaturized motors is becoming increasingly strong. To fit within the cramped space of a car, motor dimensions need to be continuously reduced. Therefore, accurately measuring the stator and rotor temperatures of the motor to ensure that product performance is neither excessive nor insufficient is crucial. Among these factors, temperature measurement of the rotor magnets or iron core is of paramount importance.

[0003] Currently, the most common method for detecting the temperature of the rotor magnets or iron cores in oil-cooled motors of new energy vehicles is remote temperature sensing. Thermocouples need to pass through the magnets or iron cores, end plates, and shafts before finally connecting to the remote temperature sensing device. There are usually two wiring methods: one is to run the wires inside a hollow shaft with wiring holes. This method requires threading the wires through the shaft holes, but the shaft holes are not easy to chamfer, resulting in many sharp edges, which poses a risk of thermocouple wire damage and failure, and threading the wires is also relatively difficult. The other method is to run the wires on the shaft surface with wiring grooves. This method is more convenient and does not pose a risk of thermocouple wire damage and failure, but it will damage the roundness of the shaft surface, which may lead to oil seal failure. Summary of the Invention

[0004] The purpose of this invention is to provide a method for sealing and measuring the temperature of the rotor magnet or core of an oil-cooled motor, so as to solve the problems existing in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A method for sealing and measuring the temperature of the rotor magnet or core of an oil-cooled motor, the method comprising: The thermocouple probe of the thermocouple is pre-embedded in the magnet or iron core of the rotor to directly sense the real-time temperature of the magnet or iron core. A wiring hole is made in the end plate of the rotor, and the thermocouple wire of the temperature measuring thermocouple is passed out through the wiring hole; A wiring groove is opened along the axial direction of the rotating shaft, and a bushing is installed between the oil seal and the rotating shaft so that the sealing lip at the center of the oil seal is in close contact with the outer periphery of the bushing. The thermocouple wires that pass through the wiring hole are laid in a specific direction along the wiring groove, pass through the inside of the bushing, and are connected to the remote temperature sensing device so that the remote temperature sensing device can obtain the real-time temperature of the magnet or iron core. The thermocouple wires inside the wiring trough are fixed using oil-resistant sealant; When the rotating shaft drives the rotor to rotate, the outer circumference of the bushing fits tightly with the sealing lip of the oil seal to form a rotating sealing interface, preventing the cooling oil from seeping into the wiring groove.

[0006] In one possible implementation, the bushing includes: The slotted end is located at one end of the bushing close to the rotor, and its outer periphery has a threading groove to facilitate the threading of the thermocouple wires; and the mating end is located at one end of the bushing that is in close contact with the sealing lip of the center of the oil seal, and its outer periphery is smooth and not slotted.

[0007] In one possible implementation, the number of the wire slots corresponds to the number of the temperature-measuring thermocouples.

[0008] In one possible implementation, the remote temperature sensing device is connected to the rotating shaft via a temperature sensing flange; The thermocouple wires passing through the wiring hole are laid oriented along the wiring groove, passing through the inside of the bushing and the inside of the temperature measuring flange in sequence, and then connected to the remote temperature sensing device.

[0009] In one possible implementation, the temperature sensing flange is interference-fitted with the rotating shaft.

[0010] In one possible implementation, the rotating shaft is rotatably connected to the front and rear covers of the oil-cooled motor housing via a first bearing and a second bearing, respectively. The thermocouple wires passing through the wiring hole are laid oriented along the wiring groove, passing sequentially through the inner side of the first bearing, the inner side of the bushing, and the inner side of the temperature measuring flange before connecting to the remote temperature sensing device.

[0011] In one possible implementation, both the first bearing and the second bearing are interference-fitted with the shaft.

[0012] In one possible implementation, the bushing is interference-fitted with the shaft.

[0013] In one possible implementation, the number of the wiring holes corresponds to the number of the temperature-sensing thermocouples.

[0014] In one possible implementation, the rotor is sleeved on the shaft, and the rotor is located in a closed cavity formed by the oil-cooled motor housing, the front cover, and the rear cover, with the stator located outside the rotor.

[0015] The beneficial effects of the technical solution provided by this invention include at least the following: This technical solution embeds the thermocouple sensor head of the temperature-sensing thermocouple into the magnet or iron core of the rotor, directly sensing the real-time temperature of the magnet or iron core. A wiring hole is made in the end plate of the rotor, through which the thermocouple wires of the temperature-sensing thermocouple are passed. A wiring groove is made along the axial direction of the shaft, and a bushing is installed between the oil seal and the shaft, ensuring tight contact between the sealing lip of the oil seal and the outer circumference of the bushing. The thermocouple wires passing through the wiring hole are laid oriented along the wiring groove, passing through the inside of the bushing and connecting to a remote temperature sensing device, allowing the remote temperature sensing device to obtain the real-time temperature of the magnet or iron core. Oil-resistant sealant is used to fix the thermocouple wires in the wiring groove. When the shaft drives the rotor to rotate, the outer circumference of the bushing and the sealing lip of the oil seal are tightly fitted, forming a rotating sealing interface to prevent coolant from seeping into the wiring groove. In this case, firstly, the thermocouple wires pass through the wiring hole and are connected to the remote temperature sensing device through the wiring groove, making the wiring more efficient, convenient, and without the risk of damage or failure; secondly, the bushing design avoids direct contact between the wiring groove and the oil seal, which could lead to oil leakage. The tight contact between the bushing and the sealing lip at the center of the oil seal ensures good sealing of the cooling cavity of the oil-cooled motor, enabling accurate measurement of the real-time temperature of the rotor magnet or iron core under various operating conditions. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0017] Figure 1 A flowchart of a sealing temperature measurement method for oil-cooled motor rotor magnets or iron cores provided by an exemplary embodiment of the present invention is shown.

[0018] Figure 2 This diagram illustrates the overall structure of the oil-cooled motor rotor magnet or iron core sealing temperature measurement method provided in an exemplary embodiment of the present invention.

[0019] Figure 3 This diagram shows a cross-sectional view of the oil-cooled motor rotor magnet or iron core sealing temperature measurement structure involved in the oil-cooled motor rotor magnet or iron core sealing temperature measurement method provided by an exemplary embodiment of the present invention.

[0020] Figure 4 The diagram shows a rotor side view of the oil-cooled motor rotor magnet or iron core sealing temperature measurement structure involved in the oil-cooled motor rotor magnet or iron core sealing temperature measurement method provided by an exemplary embodiment of the present invention.

[0021] Figure 5 The diagram shows a shaft sleeve structure of the oil-cooled motor rotor magnet or iron core sealing temperature measurement structure involved in the oil-cooled motor rotor magnet or iron core sealing temperature measurement method provided by an exemplary embodiment of the present invention. Detailed Implementation

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

[0023] In this specification, identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, while the terms "bottom surface," "top surface," "inner," and "outer" refer to directions towards or away from a specific component. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this specification, "multiple" means two or more.

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Figure 2 This diagram illustrates the overall structure of the oil-cooled motor rotor magnet sealing temperature measurement method provided in an exemplary embodiment of the present invention. Figure 3 This diagram shows a cross-sectional view of the oil-cooled motor rotor magnet or iron core sealing temperature measurement structure involved in the oil-cooled motor rotor magnet or iron core sealing temperature measurement method provided in an exemplary embodiment of the present invention. Figure 4This illustration shows a rotor side view of the oil-cooled motor rotor magnet or core sealing temperature measurement structure involved in the oil-cooled motor rotor magnet or core sealing temperature measurement method provided by an exemplary embodiment of the present invention. The oil-cooled motor rotor magnet or core sealing temperature measurement structure includes an oil-cooled motor housing 1, a front end cover 11 and a rear end cover 12 mounted at both ends of the oil-cooled motor housing 1, a stator 2 mounted inside the oil-cooled motor housing 1, and a rotor 3 located inside the stator 2 and sleeved on a rotating shaft 4. The rotating shaft 4 is rotatably connected to the front end cover 11 and the rear end cover 12. The oil-cooled motor rotor magnet or core sealing temperature measurement structure also includes a temperature-measuring thermocouple. 5, which includes a thermocouple temperature measuring head 51 pre-embedded in the magnet 31 or iron core 33 of the rotor 3, and a thermocouple wire 52 for wiring; a bushing 6, which is sleeved on the rotating shaft 4 and located inside the oil seal 111 on the front end cover 11, with its outer periphery in close contact with the sealing lip at the center of the oil seal 111; and a remote sensing temperature sensing device 7, which is located outside the oil-cooled motor housing 1 and is mounted on the rotating shaft 4; wherein, a wiring hole 321 is opened on the end plate 32 of the rotor 3, and a wiring groove 41 is opened on the rotating shaft 4; the thermocouple wire 52 passes through the wiring hole 321 and is connected to the remote sensing temperature sensing device 7 through the wiring groove 41.

[0026] It is worth mentioning that the remote sensing temperature monitoring device is designed for monitoring the temperature of rotating or high-speed moving parts. It can operate through non-contact or indirect contact methods, and its core principle is to use thermocouples to collect target temperature signals. It integrates slip ring components or wireless communication modules (such as Bluetooth, RFID, and microwave transmission) to achieve wired or wireless signal transmission. It has a built-in signal conditioning and processing unit for filtering, amplifying, and algorithm analysis of temperature data. The device is rigidly connected to the rotating shaft via a temperature sensing flange. Its housing is oil-resistant, vibration-resistant, and has a high protection level, making it suitable for high-temperature, high-humidity, and oily environments. Working in conjunction with the bushing and wiring channels, it allows the thermocouple wires to be connected through a contactless channel. While ensuring stable signal transmission, the sealed design prevents leakage from the oil cooling system, achieving a balance between accurate temperature monitoring of rotating parts and system reliability.

[0027] In detail, Figure 5 The diagram shows a bushing structure of the oil-cooled motor rotor magnet or iron core sealing temperature measurement structure involved in the oil-cooled motor rotor magnet or iron core sealing temperature measurement method provided by an exemplary embodiment of the present invention. The bushing 6 includes: a slotted end 61, which is located at one end of the bushing 6 close to the rotor 3, and has a threading groove 611 on its outer periphery to facilitate the threading of the thermocouple wire 52; and a mating end 62, which is located at one end of the bushing 6 in close contact with the sealing lip at the center of the oil seal 111, and has a smooth outer periphery without slots.

[0028] In this embodiment, the oil-cooled motor housing 1, together with the front cover 11 and the rear cover 12, forms a closed cavity, providing mechanical support for the stator 2 and rotor 3. Simultaneously, the oil seal 111 of the front cover 11 forms a rotary sealing interface for the oil-cooling system, preventing cooling oil leakage. The stator 2 and rotor 3 are the core components of the motor. The magnet 31 or iron core 33 of the rotor 3 serves as the temperature measurement target. The pre-embedded thermocouple temperature sensor 51 directly senses the real-time temperature of the magnet 31 or iron core 33, avoiding indirect temperature measurement errors. The bushing 6 is fitted onto the rotating shaft 4 and tightly fits the sealing lip of the oil seal 111, forming a rotary sealing barrier. The slot 611 of the grooved end 61 of the bushing 6 guides the thermocouple wire 52 through the groove. The smooth outer circumference of the mating end 62 of the bushing 6 ensures reliable sealing with the oil seal 111, isolating the path of the thermocouple wire 52 from the oil-cooling cavity and preventing oil leakage.

[0029] More specifically, the thermocouple wire 52 is fixed in the wiring groove 41 by oil-resistant sealant.

[0030] In this embodiment, the adhesive properties of the oil-resistant sealant firmly fix the thermocouple wire 52 within the wiring groove 41, offsetting the centrifugal force and vibration load during motor rotation. This prevents the thermocouple wire 52 from wearing, breaking, or experiencing poor signal contact due to displacement, ensuring the stability of temperature signal transmission. Furthermore, the oil-resistant sealant fills the gap between the thermocouple wire 52 and the wiring groove 41, forming an oil-resistant sealing barrier. This prevents the cooling oil from the oil-cooling system from seeping into the wiring area, avoiding oil corrosion of the thermocouple wire 52's insulation layer or the risk of oil leakage. In addition, the elastic buffering effect of the oil-resistant sealant reduces direct friction between the thermocouple wire 52 and the wall of the wiring groove 41, adapting to high-speed shaft rotation conditions. Simultaneously, its high-temperature resistance matches the high-temperature environment inside the motor, maintaining long-term fixation and sealing performance, thereby improving the reliability and service life of the temperature measurement structure.

[0031] Specifically, see Figure 2 and Figure 3 The remote sensing temperature device 7 is connected to the rotating shaft 4 via the temperature sensing flange 8.

[0032] Further, see Figure 3 The rotating shaft 4 is rotatably connected to the front cover 11 and the rear cover 12 via the first bearing 42 and the second bearing 43, respectively.

[0033] Furthermore, the number of wire grooves 611 corresponds to the number of temperature-sensing thermocouples 5. The number of wiring holes 321 corresponds to the number of temperature-sensing thermocouples 5. The temperature-sensing flange 8 is interference-fitted with the rotating shaft 4. The bushing 6 is interference-fitted with the rotating shaft 4. The first bearing 42 and the second bearing 43 are both interference-fitted with the rotating shaft 4.

[0034] In this embodiment, the number of wire grooves 611 and wire holes 321 corresponds to the number of temperature-sensing thermocouples 5, enabling one-to-one independent wiring of the wires and avoiding cross-wear and signal interference. The temperature-sensing flange 8, bushing 6, first bearing 42, and second bearing 43 are interference-fitted with the rotating shaft 4 to form a rigid mechanical connection, ensuring structural stability and reliable sealing during synchronous rotation, preventing loosening that could lead to oil leakage or signal transmission failure, and adapting to high-speed vibration conditions of the motor.

[0035] Figure 1 A flowchart illustrating an exemplary embodiment of the present invention is shown, illustrating a method for measuring the sealing temperature of an oil-cooled motor rotor magnet or core, comprising: Step 101: The thermocouple temperature sensor is pre-embedded in the magnet or iron core of the rotor to directly sense the real-time temperature of the magnet or iron core.

[0036] In this embodiment, the thermocouple temperature sensor is pre-embedded in the rotor's magnet or iron core. A precision embedding process integrates the temperature sensor with the magnet or iron core, directly contacting the heating area of ​​the magnet or iron core. This avoids the measurement delays and errors associated with traditional surface bonding or indirect conduction, ensuring the thermocouple can capture transient temperature changes in the magnet or iron core during electromagnetic conversion in real time, providing a precise data source for motor thermal management.

[0037] Step 102: Make wiring holes in the end plate of the rotor and pass the thermocouple wires of the temperature measuring thermocouple through the wiring holes.

[0038] In this embodiment, wiring holes corresponding to the number of thermocouples are opened at specific locations on the rotor end plate. The holes are positioned away from the areas where magnets or iron cores are installed to ensure the structural strength of the end plate. When the thermocouple wires are passed through the wiring holes, an appropriate redundant length is reserved to buffer the centrifugal force of rotation. At the same time, the edges of the holes are chamfered to prevent the wires from being damaged by friction, thus establishing a safe and reliable initial channel for subsequent wire laying.

[0039] Step 103: A wiring groove is opened along the axial direction of the rotating shaft, and a bushing is installed between the oil seal and the rotating shaft so that the sealing lip at the center of the oil seal is in close contact with the outer periphery of the bushing.

[0040] In this embodiment, a routing groove adapted to the diameter of the wire is milled or laser-machined along the axis of the rotating shaft. The depth and width of the groove ensure that the wire does not protrude significantly after being embedded. A bushing is interference-fitted between the front end cover oil seal and the rotating shaft. The outer circumference of its mating end is precisely matched with the sealing lip of the oil seal to form a dynamic sealing surface, isolating the oil cooling cavity from the wire path.

[0041] Step 104: The thermocouple wires passing through the wiring hole are laid oriented along the wiring groove, pass through the inside of the bushing, and are connected to the remote temperature sensing device, so that the remote temperature sensing device can obtain the real-time temperature of the magnet or iron core.

[0042] In this embodiment, the thermocouple wires exiting the wiring hole are laid in a straight line along the shaft wiring groove. The groove constrains the wire's movement trajectory, and the wires sequentially pass through the inner side of the first bearing, the inner side of the bushing, and the inner side of the temperature sensing flange, finally connecting to the signal input terminal of the remote temperature sensing device. This path design ensures that the wires do not experience contact interference as the shaft rotates, guaranteeing stable transmission of the temperature signal.

[0043] Step 105: Use oil-resistant sealant to fix the thermocouple wires in the wiring groove.

[0044] In this embodiment, a high-temperature resistant and oil-corrosion-resistant silicone or fluororubber sealant is selected to uniformly fill the gap between the wire and the wiring groove. After the sealant cures, it forms an elastic sealing layer. The sealant not only fixes the wire to prevent displacement, but also blocks the path of cooling oil seeping along the groove, while buffering the mechanical impact of shaft vibration on the wire and extending the service life of the temperature sensing component.

[0045] Step 106: When the rotating shaft drives the rotor to rotate, the outer circumference of the bushing is tightly fitted with the sealing lip of the oil seal to form a rotating sealing interface, preventing the cooling oil from seeping into the wiring groove.

[0046] In this embodiment, when the shaft drives the rotor to rotate at high speed, a dynamic contact interface is formed between the outer periphery of the bushing and the sealing lip of the oil seal. The elastic deformation of the lip ensures that it remains in close contact with the surface of the bushing, and the hydrodynamic pressure effect generated by the rotation of the shaft further enhances the sealing effect. This design concentrates the sealing function of the oil cooling system on the mating surface between the bushing and the oil seal, completely isolating the wire path from the oil and eliminating the risk of oil leakage.

[0047] In summary, this technical solution embeds the thermocouple sensor head of the temperature-sensing thermocouple into the magnet or iron core of the rotor, directly sensing the real-time temperature of the magnet or iron core; wiring holes are opened on the end plate of the rotor, and the thermocouple wires of the temperature-sensing thermocouple are passed through the wiring holes; a wiring groove is opened along the axial direction of the shaft, and a bushing is installed between the oil seal and the shaft, so that the sealing lip at the center of the oil seal is in close contact with the outer circumference of the bushing; the thermocouple wires passing through the wiring holes are laid oriented along the wiring groove, pass through the inside of the bushing, and are connected to the remote temperature sensing device, so that the remote temperature sensing device can obtain the real-time temperature of the magnet or iron core; the thermocouple wires in the wiring groove are fixed with oil-resistant sealant; when the shaft drives the rotor to rotate, the outer circumference of the bushing and the sealing lip of the oil seal are tightly fitted to form a rotating sealing interface, preventing the cooling oil from seeping into the wiring groove. In this case, firstly, the thermocouple wires pass through the wiring hole and are connected to the remote temperature sensing device through the wiring groove, making the wiring more efficient, convenient, and without the risk of damage or failure; secondly, the bushing design avoids direct contact between the wiring groove and the oil seal, which could lead to oil leakage. The tight contact between the bushing and the sealing lip at the center of the oil seal ensures good sealing of the cooling cavity of the oil-cooled motor, enabling accurate measurement of the real-time temperature of the rotor magnet or iron core under various operating conditions.

[0048] In the embodiments disclosed in this invention, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments disclosed in this invention according to the specific circumstances.

[0049] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for sealing and measuring the temperature of the rotor magnet or core of an oil-cooled motor, characterized in that, The method includes: The thermocouple probe of the thermocouple is pre-embedded in the magnet or iron core of the rotor to directly sense the real-time temperature of the magnet or iron core. A wiring hole is made in the end plate of the rotor, and the thermocouple wire of the temperature measuring thermocouple is passed out through the wiring hole; A wiring groove is opened along the axial direction of the rotating shaft, and a bushing is installed between the oil seal and the rotating shaft so that the sealing lip at the center of the oil seal is in close contact with the outer periphery of the bushing. The thermocouple wires that pass through the wiring hole are laid in a specific direction along the wiring groove, pass through the inside of the bushing, and are connected to the remote temperature sensing device so that the remote temperature sensing device can obtain the real-time temperature of the magnet or iron core. The thermocouple wires inside the wiring trough are fixed using oil-resistant sealant; When the rotating shaft drives the rotor to rotate, the outer periphery of the bushing fits tightly with the sealing lip of the oil seal to form a rotating sealing interface, preventing the cooling oil from seeping into the wiring groove. The bushing includes: The slotted end, located at one end of the bushing near the rotor, has a threading groove on its outer periphery to facilitate the passage of the thermocouple wires; and The mating end is located at the end where the sealing lip of the bushing and the center of the oil seal are in close contact, and its outer circumference is smooth and without grooves.

2. The method for sealing and measuring the temperature of the rotor magnet or core of an oil-cooled motor according to claim 1, characterized in that, The number of the wire slots corresponds to the number of the temperature measuring thermocouples.

3. The method for sealing and measuring the temperature of the rotor magnet or core of an oil-cooled motor according to claim 1, characterized in that, The remote temperature sensing device is connected to the rotating shaft via a temperature sensing flange; The thermocouple wires passing through the wiring hole are laid oriented along the wiring groove, passing through the inside of the bushing and the inside of the temperature measuring flange in sequence, and then connected to the remote temperature sensing device.

4. The method for sealing and measuring the temperature of the rotor magnet or core of an oil-cooled motor according to claim 3, characterized in that, The temperature measuring flange is interference-fitted with the rotating shaft.

5. The method for sealing and measuring the temperature of the rotor magnet or core of an oil-cooled motor according to claim 3, characterized in that, The rotating shaft is rotatably connected to the front and rear covers of the oil-cooled motor housing via a first bearing and a second bearing, respectively. The thermocouple wires passing through the wiring hole are laid oriented along the wiring groove, passing sequentially through the inner side of the first bearing, the inner side of the bushing, and the inner side of the temperature measuring flange before connecting to the remote temperature sensing device.

6. The method for sealing and measuring the temperature of the rotor magnet or core of an oil-cooled motor according to claim 5, characterized in that, Both the first bearing and the second bearing are interference-fitted with the shaft.

7. The method for sealing and measuring the temperature of the rotor magnet or core of an oil-cooled motor according to claim 1, characterized in that, The bushing is interference-fitted with the rotating shaft.

8. The method for sealing and measuring the temperature of the rotor magnet or core of an oil-cooled motor according to claim 1, characterized in that, The number of wiring holes corresponds to the number of temperature measuring thermocouples.

9. The method for sealing and measuring the temperature of the rotor magnet or core of an oil-cooled motor according to claim 1, characterized in that, The rotor is sleeved on the rotating shaft, and the rotor is located in a closed cavity formed by the oil-cooled motor housing, the front end cover and the rear end cover, while the stator is located outside the rotor.

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