Sealing temperature measurement method for rotor magnetic steel or iron core of oil-cooled motor

Abstract

The invention relates to an oil-cooled motor rotor magnetic steel or iron core sealing temperature measurement method, and relates to the field of new energy automobile motors. According to the technical scheme, the thermocouple temperature measuring head of the temperature measuring thermocouple is pre-embedded on the magnetic steel or the iron core of the rotor; a wiring hole is formed in an end plate of the rotor, and a thermocouple wire of the temperature thermocouple penetrates out of the wiring hole; a wiring groove is formed in the axial direction of the rotating shaft, and a shaft sleeve is installed between the oil seal and the rotating shaft; a thermocouple wire penetrating out of the wiring hole is directionally laid along the wiring groove, penetrates through the inner side of the shaft sleeve and then is connected with a remote sensing temperature measuring device, so that the remote sensing temperature measuring device obtains the real-time temperature of the magnetic steel or the iron core; the thermocouple wire in the wiring channel is fixed by using an oil-resistant sealant; when the rotating shaft drives the rotor to rotate, the periphery of the shaft sleeve is tightly attached to the sealing lip of the oil seal, and a rotating sealing interface is formed. Under the condition, the sealing of the cooling cavity of the oil-cooled motor is ensured, and meanwhile, the real-time temperature of the rotor magnetic steel or the iron core under each working condition is accurately measured.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicle motors, and in particular to a method for measuring the temperature of a magnetic steel or iron core seal of an oil-cooled motor rotor. Background Art

[0002] Amidst the booming new energy vehicle industry, the demand for motor miniaturization is growing stronger. To fit within the tight confines of a vehicle, motor size continues to shrink. Therefore, accurately measuring the stator and rotor temperatures of motors is crucial to ensuring that product performance meets requirements while meeting expectations. Temperature measurement of the rotor magnets or core is crucial within this critical area.

[0003] Currently, the most common method for detecting the temperature of the rotor magnet or core of an oil-cooled motor in new energy vehicles is remote temperature sensing. The thermocouple must pass through the magnet or core, end plate, and rotating shaft before finally connecting to the remote temperature sensing device. There are two common wiring methods: one is to route the wire inside a hollow shaft with a routing hole. This method requires threading the wire through the shaft hole, but the shaft hole is difficult to chamfer and has many sharp edges, which puts the thermocouple wire at risk of breaking and failing, and threading the wire is also difficult. The other method is to route the wire on the shaft surface with routing grooves. This method is more convenient and eliminates the risk of thermocouple wire breaking and failing, but it can damage the roundness of the shaft surface, leading to oil seal failure. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for measuring the temperature of the magnetic steel or core seal of an oil-cooled motor rotor to solve the problems existing in the above-mentioned prior art.

[0005] To achieve the above object, the technical solution adopted by the present invention is: A method for measuring the temperature of a magnetic steel or iron core seal of an oil-cooled motor rotor, the method comprising: The thermocouple temperature measuring head of the temperature measuring thermocouple is pre-buried on the magnetic steel or iron core of the rotor to directly sense the real-time temperature of the magnetic steel or iron core; A wiring hole is provided on the end plate of the rotor, and the thermocouple wire of the temperature measuring thermocouple is passed through the wiring hole; A wiring groove is provided along the axial direction of the rotating shaft, and a shaft sleeve 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 shaft sleeve; The thermocouple wire passing through the wiring hole is laid along the wiring groove in a direction, passed through the inner side of the sleeve and connected to the remote sensing temperature measurement device, so that the remote sensing temperature measurement device can obtain the real-time temperature of the magnetic steel or iron core; Fixing the thermocouple wires in the wiring trough with oil-resistant sealant; When the rotating shaft drives the rotor to rotate, the outer periphery of the shaft sleeve fits tightly with the sealing lip of the oil seal to form a rotating sealing interface, thereby preventing cooling oil from seeping into the wiring groove.

[0006] In a possible implementation, the sleeve includes: The slotted end is located at the end of the sleeve close to the rotor, and a threading groove is provided on its outer circumference to facilitate the threading of the thermocouple wire; and the butt end is located at the end of the sleeve that is in close contact with the sealing lip in the center of the oil seal, and its outer circumference is smooth and not slotted.

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

[0008] In a possible implementation, the remote sensing temperature measurement device is connected to the rotating shaft via a temperature measurement flange; The thermocouple wire passing through the wiring hole is laid directionally along the wiring groove, passes through the inner side of the shaft sleeve and the inner side of the temperature measuring flange in sequence, and is connected to the remote sensing temperature measuring device.

[0009] In a possible implementation, the temperature measuring flange and the rotating shaft are interference fit.

[0010] In a possible implementation, the rotating shaft is rotatably connected to the front end cover and the rear end cover of the oil-cooled motor housing through a first bearing and a second bearing respectively; The thermocouple wire passing through the wiring hole is laid directionally along the wiring groove, passes through the inner side of the first bearing, the inner side of the shaft sleeve, and the inner side of the temperature measuring flange in sequence, and is connected to the remote sensing temperature measurement device.

[0011] In a possible implementation, both the first bearing and the second bearing are interference fit with the rotating shaft.

[0012] In a possible implementation, the shaft sleeve and the rotating shaft are interference fit.

[0013] In a possible implementation, the number of the wiring holes corresponds to the number of the temperature measuring thermocouples.

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

[0015] The beneficial effects brought about by the technical solution provided by the present invention include at least: In this technical solution, the thermocouple temperature measuring head of the temperature measuring thermocouple is pre-buried on the magnetic steel or iron core of the rotor to directly sense the real-time temperature of the magnetic steel or iron core; a wiring hole is opened on the end plate of the rotor, and the thermocouple wire of the temperature measuring thermocouple is passed through the wiring hole; a wiring groove is opened along the axial direction of the rotating shaft, and a shaft sleeve is installed between the oil seal and the rotating shaft, so that the sealing lip in the center of the oil seal is in close contact with the outer periphery of the shaft sleeve; the thermocouple wire passing through the wiring hole is directionally laid along the wiring groove, passed through the inside of the shaft sleeve and connected to the remote sensing temperature measurement device, so that the remote sensing temperature measurement device can obtain the real-time temperature of the magnetic steel or iron core; the thermocouple wire in the wiring groove is fixed with oil-resistant sealant; when the rotating shaft drives the rotor to rotate, the outer periphery of the shaft sleeve is tightly fitted with the sealing lip of the oil seal to form a rotating sealing interface, thereby preventing cooling oil from seeping into the wiring groove. In this case, firstly, the thermocouple wire passes through the wiring hole and is connected to the remote temperature sensing device through the wiring groove, making the wiring more efficient and convenient without the risk of skin damage and failure; secondly, the setting of the shaft sleeve avoids direct contact between the wiring groove and the oil seal to cause oil leakage, and the close contact between the shaft sleeve and the sealing lip in the center of the oil seal ensures that the cooling cavity of the oil-cooled motor is well sealed, realizing accurate measurement of the real-time temperature of the rotor magnet or iron core under various working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0017] Figure 1 A flow chart of a method for measuring the temperature of a rotor magnetic steel or core seal of an oil-cooled motor provided by an exemplary embodiment of the present invention is shown.

[0018] Figure 2 An overall schematic diagram of a sealed temperature measurement structure of a rotor magnetic steel or core of an oil-cooled motor involved in a sealed temperature measurement method of a rotor magnetic steel or core of an oil-cooled motor provided by an exemplary embodiment of the present invention is shown.

[0019] Figure 3 A cross-sectional schematic diagram of a sealed temperature measurement structure of a rotor magnetic steel or core of an oil-cooled motor involved in a sealed temperature measurement method of a rotor magnetic steel or core of an oil-cooled motor provided by an exemplary embodiment of the present invention is shown.

[0020] Figure 4 A rotor side view of a sealed temperature measurement structure of a magnetic steel or core of an oil-cooled motor rotor involved in a sealed temperature measurement method of a magnetic steel or core of an oil-cooled motor rotor provided by an exemplary embodiment of the present invention is shown.

[0021] Figure 5 A shaft sleeve structure diagram of a sealed temperature measurement structure of an oil-cooled motor rotor magnetic steel or iron core involved in a sealed temperature measurement method of an oil-cooled motor rotor magnetic steel or iron core provided by an exemplary embodiment of the present invention is shown. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] Among them, the same parts are represented by the same figure marks. It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings of the present invention specification, and the words "bottom" and "top", "inside" and "outside" refer to directions toward or away from specific parts, respectively. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention specification, the meaning of "multiple" is two or more.

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

[0025] Figure 2 FIG2 shows an overall schematic diagram of an oil-cooled motor rotor magnetic steel sealed temperature measurement structure involved in a method for measuring the sealed temperature of an oil-cooled motor rotor magnetic steel or core provided by an exemplary embodiment of the present invention. Figure 3 A schematic cross-sectional view of a sealed temperature measurement structure of a magnetic steel or core of an oil-cooled motor rotor, provided in a sealed temperature measurement method of a magnetic steel or core of an oil-cooled motor rotor, is shown. Figure 4A side view of a rotor of an oil-cooled motor rotor magnetic steel or iron core sealed temperature measurement structure involved in a method for measuring the temperature of an oil-cooled motor rotor magnetic steel or iron core provided by an exemplary embodiment of the present invention is shown. The oil-cooled motor rotor magnetic steel or iron core sealed temperature measurement structure includes an oil-cooled motor housing 1, a front end cover 11 and a rear end cover 12 installed at both ends of the oil-cooled motor housing 1, a stator 2 installed in the oil-cooled motor housing 1, and a rotor 3 located on the inner side of the stator 2 and sleeved on the 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 magnetic steel or iron core sealed temperature measurement structure also includes: a temperature measuring thermocouple 5, which includes a thermocouple temperature measuring head 51 embedded in the magnet 31 or iron core 33 of the rotor 3, and a thermocouple wire 52 for wiring; a shaft sleeve 6, which is sleeved on the rotating shaft 4 and located inside the oil seal 111 on the front end cover 11, and its outer periphery is in close contact with the sealing lip at the center of the oil seal 111; and a remote temperature sensing device 7, which is located outside the oil-cooled motor housing 1 and is mounted on the rotating shaft 4; wherein, the end plate 32 of the rotor 3 is provided with a wiring hole 321, and the rotating shaft 4 is provided with a wiring groove 41; the thermocouple wire 52 extends through the wiring hole 321 and is connected to the remote temperature sensing device 7 through the wiring groove 41.

[0026] It's worth noting that remote temperature sensing devices monitor the temperature of rotating or high-speed moving parts. They operate via non-contact or indirect contact, relying on the use of thermocouples to acquire target temperature signals. They integrate slip ring assemblies or wireless communication modules (such as Bluetooth, RFID, and microwave transmission) to enable wired or wireless signal transmission. They also include a built-in signal conditioning and processing unit capable of filtering, amplifying, and performing algorithmic analysis on temperature data. The device is rigidly connected to the rotating shaft via a temperature-measuring flange. Its housing is oil-resistant and vibration-resistant, offering a high level of protection and suitability for high-temperature, high-humidity, and oil-contaminated environments. Working in conjunction with the shaft sleeve and wiring trough, it allows for contactless access to the thermocouple wires. While ensuring stable signal transmission, the sealed design prevents leakage from the oil cooling system, achieving a balance between precise monitoring of rotating component temperatures and system reliability.

[0027] In detail, Figure 5 A diagram showing the structure of a sleeve for measuring the temperature of an oil-cooled motor rotor magnet or core seal involved in a method for measuring the temperature of an oil-cooled motor rotor magnet or core seal provided by an exemplary embodiment of the present invention is shown. The sleeve 6 includes: a slotted end 61, which is located at the end of the sleeve 6 close to the rotor 3, and has a threading groove 611 on its outer periphery for facilitating the threading of the thermocouple wire 52; and a butt end 62, which is located at the end of the sleeve 6 that is 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 the embodiment of the present application, the oil-cooled motor housing 1, the front end cover 11 and the rear end cover 12 form a closed cavity, providing mechanical support for the stator 2 and the rotor 3. At the same time, the oil seal 111 of the front end cover 11 forms a rotating sealing interface of the oil cooling system to prevent leakage of cooling oil. The stator 2 and the rotor 3 are the core components of the motor. The magnet 31 or the iron core 33 of the rotor 3 is the temperature measurement target. The embedded thermocouple temperature measuring head 51 directly senses the real-time temperature of the magnet 31 or the iron core 33 to avoid indirect temperature measurement errors. The shaft sleeve 6 is sleeved on the rotating shaft 4 and fits tightly with the sealing lip of the oil seal 111 to form a rotating sealing barrier. The threading groove 611 of the slotted end 61 of the shaft sleeve 6 guides the threading of the thermocouple wire 52. The smooth outer periphery of the butt end 62 of the shaft sleeve 6 ensures the sealing reliability with the oil seal 111, isolates the path of the thermocouple wire 52 from the oil cooling cavity, and prevents oil leakage.

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

[0030] In the embodiment of the present application, the adhesive properties of the oil-resistant sealant can firmly fix the isolated thermocouple wire 52 in the wiring groove 41, offset the centrifugal force and vibration load during the rotation of the motor, prevent the thermocouple wire 52 from being worn, broken or having poor signal contact due to displacement, and ensure the stability of the temperature signal transmission; and the oil-resistant sealant fills the gap between the thermocouple wire 52 and the wiring groove 41 to form an oil-resistant sealing barrier, preventing the cooling oil of the oil cooling system from penetrating into the wiring area, avoiding the oil from corroding the insulation layer of the thermocouple wire 52 or causing the risk of oil leakage; in addition, the elastic buffering effect of the oil-resistant sealant can reduce the direct friction between the thermocouple wire 52 and the wall of the wiring groove 41, adapting to the high-speed rotation condition of the shaft, and at the same time its high-temperature resistance can match the high-temperature environment inside the motor, maintaining the fixation and sealing performance for a long time, thereby improving the reliability and service life of the temperature measurement structure.

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

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

[0033] Furthermore, the number of wire slots 611 corresponds to the number of temperature-measuring thermocouples 5. The number of wiring holes 321 corresponds to the number of temperature-measuring thermocouples 5. The temperature-measuring flange 8 has an interference fit with the rotating shaft 4. The sleeve 6 has an interference fit with the rotating shaft 4. The first bearing 42 and the second bearing 43 both have an interference fit with the rotating shaft 4.

[0034] In this embodiment, the number of wire slots 611 and wiring holes 321 corresponds to the number of thermocouples 5, enabling independent, one-to-one routing of the wires and preventing cross-wear and signal interference. Thermocouple flange 8, sleeve 6, first bearing 42, and second bearing 43 form an interference fit with shaft 4, forming a rigid mechanical connection. This ensures structural stability and reliable sealing during synchronous rotation, preventing looseness that could lead to oil leakage or signal transmission failure, and adapting to the high-speed vibration conditions of the motor.

[0035] Figure 1 A flow chart of a method for measuring the temperature of a rotor magnetic steel or core seal of an oil-cooled motor provided by an exemplary embodiment of the present invention is shown. The method for measuring the temperature of a rotor magnetic steel or core seal of an oil-cooled motor comprises: Step 101 : pre-embed the thermocouple temperature measuring head of the temperature measuring thermocouple on the magnetic steel or iron core of the rotor to directly sense the real-time temperature of the magnetic steel or iron core.

[0036] In the embodiments of this application, the thermocouple head is embedded in the rotor's magnetic steel or core. Through a precision embedding process, the head and the magnetic steel or core form an integrated structure, directly contacting the heating area of the magnetic steel or core. This avoids the temperature measurement delays and errors caused by traditional surface bonding or indirect conduction, ensuring that the thermocouple can capture the transient temperature changes of the magnetic steel or core during the electromagnetic conversion process in real time, providing a precise data source for motor thermal management.

[0037] Step 102: A wiring hole is formed in the end plate of the rotor, and the thermocouple wire of the temperature measuring thermocouple is passed through the wiring hole.

[0038] In this embodiment, wiring holes corresponding to the number of thermocouples are located in specific locations on the rotor endplate. These holes are positioned away from the magnetic steel or core mounting areas to ensure structural strength. When the thermocouple wires are threaded through the holes, a suitable amount of excess length is reserved to buffer the centrifugal force of rotation. The hole edges are chamfered to prevent wire breakage from friction, thus establishing a safe and reliable initial path for subsequent wire routing.

[0039] Step 103: A wiring groove is opened along the axial direction of the rotating shaft, and a shaft sleeve 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 shaft sleeve.

[0040] In this embodiment, a routing groove adapted to the wire diameter is milled or laser-machined along the shaft axis. The groove depth and width ensure that the wire does not protrude noticeably after insertion. A bushing is interference-fitted between the front cover oil seal and the shaft. The outer periphery of its butt end precisely mates with the oil seal lip, forming a dynamic sealing surface that isolates the oil cooling chamber from the wire path.

[0041] Step 104 : Directly lay the thermocouple wire passing through the wiring hole along the wiring groove, pass through the inner side of the sleeve, and connect it to a remote temperature sensing device, so that the remote temperature sensing device can obtain the real-time temperature of the magnetic steel or the iron core.

[0042] In this embodiment, the thermocouple wire, which passes through the wiring hole, is laid straight along the shaft wiring groove. The groove constrains the wire's trajectory, passing through the inside of the first bearing, the inside of the shaft sleeve, and the inside of the temperature measurement flange, ultimately connecting to the signal input of the remote temperature sensing device. This routing design eliminates contact interference as the wire rotates with the shaft, ensuring stable transmission of the temperature signal.

[0043] Step 105: Fix the thermocouple wires in the wiring trough with oil-resistant sealant.

[0044] In this embodiment, a heat-resistant, oil-resistant silicone or fluororubber sealant is used to evenly fill the gap between the wires and the wiring trough. Once the sealant solidifies, it forms an elastic seal. This sealant not only secures the wires to prevent displacement but also blocks the path for cooling oil to penetrate through the trough. It also cushions the mechanical impact of shaft vibration on the wires, extending the service life of the temperature measurement component.

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

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

[0047] To sum up, the technical solution pre-buries the thermocouple temperature measuring head of the temperature measuring thermocouple on the magnet or iron core of the rotor to directly sense the real-time temperature of the magnet or iron core; opens a wiring hole on the end plate of the rotor, and passes the thermocouple wire of the temperature measuring thermocouple through the wiring hole; opens a wiring groove along the axial direction of the rotating shaft, and installs a shaft sleeve between the oil seal and the rotating shaft, so that the sealing lip in the center of the oil seal is in close contact with the outer periphery of the shaft sleeve; lays the thermocouple wire passing through the wiring groove in a direction, passes through the inner side of the shaft sleeve, and connects it to the remote sensing temperature measuring device, so that the remote sensing temperature measuring device can obtain the real-time temperature of the magnet or iron core; uses oil-resistant sealant to fix the thermocouple wire in the wiring groove; when the rotating shaft drives the rotor to rotate, the outer periphery of the shaft sleeve is tightly fitted with the sealing lip of the oil seal to form a rotating sealing interface, thereby preventing cooling oil from seeping into the wiring groove. In this case, firstly, the thermocouple wire passes through the wiring hole and is connected to the remote temperature sensing device through the wiring groove, making the wiring more efficient and convenient without the risk of skin damage and failure; secondly, the setting of the shaft sleeve avoids direct contact between the wiring groove and the oil seal to cause oil leakage, and the close contact between the shaft sleeve and the sealing lip in the center of the oil seal ensures that the cooling cavity of the oil-cooled motor is well sealed, realizing accurate measurement of the real-time temperature of the rotor magnet or iron core under various working conditions.

[0048] In the embodiments disclosed herein, terms such as "installed," "connected," "connected," and "fixed" should be understood broadly. For example, "connected" may refer to a fixed connection, a detachable connection, or an integral connection; and "connected" may refer to a direct connection or an indirect connection via an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments disclosed herein based on specific circumstances.

[0049] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for measuring the temperature of the rotor magnet or core seal of an oil-cooled motor, characterized in that: The method comprises: The thermocouple temperature measuring head of the temperature measuring thermocouple is pre-buried on the magnetic steel or iron core of the rotor to directly sense the real-time temperature of the magnetic steel or iron core; A wiring hole is provided on the end plate of the rotor, and the thermocouple wire of the temperature measuring thermocouple is passed through the wiring hole; A wiring groove is provided along the axial direction of the rotating shaft, and a shaft sleeve 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 shaft sleeve; The thermocouple wire passing through the wiring hole is laid along the wiring groove in a direction, passed through the inner side of the sleeve and connected to the remote sensing temperature measurement device, so that the remote sensing temperature measurement device can obtain the real-time temperature of the magnetic steel or iron core; Fixing the thermocouple wires in the wiring trough with oil-resistant sealant; When the rotating shaft drives the rotor to rotate, the outer periphery of the shaft sleeve fits tightly with the sealing lip of the oil seal to form a rotating sealing interface, thereby preventing cooling oil from seeping into the wiring groove.

2. The oil-cooled motor rotor magnetic steel or core seal temperature measurement method according to claim 1 is characterized in that: The sleeve comprises: a slotted end, located at one end of the sleeve close to the rotor, with a threading groove on its outer circumference for facilitating threading of the thermocouple wire; and The butt end is located at the end where the shaft sleeve is in close contact with the sealing lip at the center of the oil seal, and its outer circumference is smooth and not grooved.

3. The oil-cooled motor rotor magnetic steel or core seal temperature measurement method according to claim 2, characterized in that: The number of the wire threading grooves corresponds to the number of the temperature measuring thermocouples.

4. The oil-cooled motor rotor magnetic steel or core seal temperature measurement method according to claim 1, characterized in that: The remote sensing temperature measuring device is connected to the rotating shaft via a temperature measuring flange; The thermocouple wire passing through the wiring hole is laid directionally along the wiring groove, passes through the inner side of the shaft sleeve and the inner side of the temperature measuring flange in sequence, and is connected to the remote sensing temperature measuring device.

5. The oil-cooled motor rotor magnetic steel or core seal temperature measurement method according to claim 4, characterized in that: The temperature measuring flange is interference fit with the rotating shaft.

6. The method for measuring temperature of the oil-cooled motor rotor magnetic steel or core seal according to claim 4, characterized in that: The rotating shaft is rotatably connected to the front end cover and the rear end cover of the oil-cooled motor housing through a first bearing and a second bearing respectively; The thermocouple wire passing through the wiring hole is laid directionally along the wiring groove, passes through the inner side of the first bearing, the inner side of the shaft sleeve, and the inner side of the temperature measuring flange in sequence, and is connected to the remote sensing temperature measurement device.

7. The method for measuring temperature of the oil-cooled motor rotor magnetic steel or core seal according to claim 6, characterized in that: The first bearing and the second bearing are both interference fit with the rotating shaft.

8. The method for measuring temperature of the oil-cooled motor rotor magnetic steel or core seal according to claim 1, characterized in that: The shaft sleeve is interference fit with the rotating shaft.

9. The method for measuring temperature of the oil-cooled motor rotor magnetic steel or core seal according to claim 1, characterized in that: The number of the wiring holes corresponds to the number of the temperature measuring thermocouples.

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

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