Oil-cooled motor rotor magnetic steel or core sealing temperature measuring structure
By pre-embedding thermocouple temperature measuring heads on the rotor magnets or iron core of the oil-cooled motor and utilizing the tight contact design between the bushing and the oil seal, the problems of thermocouple wire breakage and oil seal failure are solved, achieving efficient and reliable temperature measurement of the rotor magnets or iron core, ensuring the stability of motor performance and cost savings.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WUXI WEIFU HIGH TECH CO LTD
- Filing Date
- 2025-06-10
- Publication Date
- 2026-07-14
AI Technical Summary
In existing technologies, temperature detection of the rotor magnets or iron core of oil-cooled motors is subject to the risk of thermocouple wire breakage and oil seal failure, making it difficult to achieve efficient and convenient temperature measurement.
The thermocouple temperature sensor is embedded in the rotor magnet or iron core and sleeved on the rotating shaft, making tight contact with the inside of the oil seal. A wiring hole is opened on the rotor end plate and a wiring groove is opened on the rotating shaft. The thermocouple wires pass through the wiring hole and are connected to the remote sensing temperature device through the wiring groove. They are fixed with oil-resistant sealant to form a contactless channel.
It achieves efficient and convenient wiring of thermocouple wires, avoids the risk of insulation damage and failure, ensures the sealing of the cooling cavity of the oil-cooled motor, realizes accurate real-time temperature measurement of rotor magnets or iron cores, reduces costs and improves the reliability and service life of the temperature measurement structure.
Smart Images
Figure CN224503132U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of new energy vehicle motor technology, and in particular to a sealed temperature measurement structure for an oil-cooled motor rotor magnet or iron core. 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 sealed temperature measurement structure for the rotor magnet or iron core of an oil-cooled motor to solve the problems existing in the prior art.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0006] A sealed temperature measuring structure for the rotor magnet or core of an oil-cooled motor includes an oil-cooled motor housing, a front cover and a rear cover mounted at both ends of the oil-cooled motor housing, a stator mounted inside the oil-cooled motor housing, and a rotor located inside the stator and sleeved on a rotating shaft. The rotating shaft is rotatably connected to the front cover and the rear cover. The sealed temperature measuring structure for the rotor magnet or core of the oil-cooled motor further includes:
[0007] A temperature measuring thermocouple, comprising a thermocouple temperature measuring head pre-embedded in the magnet or iron core of the rotor, and thermocouple wires for wiring;
[0008] A bushing, fitted onto the rotating shaft and located inside the oil seal on the front end cover, its outer circumference in close contact with the sealing lip at the center of the oil seal; and
[0009] A remote temperature sensing device is located on the outside of the oil-cooled motor housing and is mounted on the rotating shaft;
[0010] The rotor has a wiring hole on its end plate and a wiring groove on its shaft. The thermocouple wires pass through the wiring hole and are connected to the remote temperature sensing device through the wiring groove.
[0011] In one possible implementation, the bushing includes:
[0012] 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
[0013] 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.
[0014] In one possible implementation, the number of the wire slots corresponds to the number of the temperature-measuring thermocouples.
[0015] In one possible implementation, the thermocouple wires are fixed to the wiring groove by an oil-resistant sealant.
[0016] In one possible implementation, the remote temperature sensing device is connected to the rotating shaft via a temperature sensing flange.
[0017] In one possible implementation, the temperature sensing flange is interference-fitted with the rotating shaft.
[0018] In one possible implementation, the bushing is interference-fitted with the shaft.
[0019] In one possible implementation, the rotating shaft is rotatably connected to the front end cover and the rear end cover via a first bearing and a second bearing, respectively.
[0020] In one possible implementation, both the first bearing and the second bearing are interference-fitted with the shaft.
[0021] In one possible implementation, the number of the wiring holes corresponds to the number of the temperature-sensing thermocouples.
[0022] The beneficial effects of the technical solution provided by this utility model include at least the following:
[0023] In this technical solution, the thermocouple temperature sensor is embedded in the rotor's magnet or core. A bushing is fitted onto the shaft and located inside the oil seal on the front cover. The outer circumference of the bushing is in close contact with the sealing lip at the center of the oil seal. A wiring hole is provided on the rotor's end plate, and a wiring groove is provided on the shaft. The thermocouple wires pass through the wiring hole and connect to the remote temperature sensing device via the wiring groove. In this configuration, firstly, the wiring is more efficient and convenient, eliminating the risk of wire breakage and failure, reducing thermocouple wear, and saving costs. Secondly, the bushing design prevents direct contact between the wiring groove and the oil seal, thus avoiding oil leakage. The tight contact between the bushing and the sealing lip at the center of the oil seal ensures good sealing of the oil-cooled motor's cooling cavity, enabling accurate measurement of the rotor magnet or core temperature under various operating conditions, ensuring that the product performance is not excessive and meets requirements. Attached Figure Description
[0024] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.
[0025] Figure 1 This illustration shows an overall schematic diagram of a sealed temperature measuring structure for an oil-cooled motor rotor magnet or iron core provided in an exemplary embodiment of the present invention.
[0026] Figure 2 This illustration shows a cross-sectional schematic diagram of a sealed temperature measuring structure for an oil-cooled motor rotor magnet or iron core provided in an exemplary embodiment of the present invention.
[0027] Figure 3 This illustration shows a side view of a rotor of an oil-cooled motor rotor magnet or iron core sealed temperature measuring structure provided in an exemplary embodiment of the present invention.
[0028] Figure 4 A schematic diagram of the bushing structure of the sealing temperature measuring structure for the rotor magnet or iron core of an oil-cooled motor provided in an exemplary embodiment of the present invention is shown.
[0029] In the diagram: 1. Oil-cooled motor housing; 11. Front cover; 111. Oil seal; 12. Rear cover; 2. Stator; 3. Rotor; 31. Magnet; 32. End plate; 321. Wiring hole; 33. Iron core; 4. Shaft; 41. Wiring groove; 42. First bearing; 43. Second bearing; 5. Temperature measuring thermocouple; 51. Thermocouple temperature measuring head; 52. Thermocouple wire; 6. Bushing; 61. Slotted end; 611. Wire groove; 62. Connecting end; 7. Remote sensing temperature measuring device; 8. Temperature measuring flange. Detailed Implementation
[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0031] 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 of this utility model, while the terms "bottom surface," "top surface," "inner," and "outer" refer to directions towards or away from a specific component, respectively. 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "multiple" means two or more.
[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0033] Figure 1 This diagram shows an overall schematic of a sealed temperature measuring structure for an oil-cooled motor rotor magnet or iron core provided in an exemplary embodiment of the present invention. Figure 2 This diagram shows a cross-sectional view of a sealed temperature measuring structure for the rotor magnet or core of an oil-cooled motor, provided in an exemplary embodiment of the present invention. Figure 3 This illustration shows a side view of a rotor of an oil-cooled motor rotor magnet or iron core sealed temperature measuring structure provided in an exemplary embodiment of the present invention. The oil-cooled motor rotor magnet or iron core sealed temperature measuring 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 iron core sealed temperature measuring structure also includes a temperature measuring thermocouple 5, which includes a pre-embedded... The rotor 3 has a thermocouple temperature sensor 51 on the magnet 31 or iron core 33, 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 device 7, which is located outside the oil-cooled motor housing 1 and is mounted on the rotating shaft 4; wherein, the rotor 3 has a wiring hole 321 on the end plate 32, and the rotating shaft 4 has a wiring groove 41; the thermocouple wire 52 passes through the wiring hole 321 and is connected to the remote sensing temperature device 7 through the wiring groove 41.
[0034] 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.
[0035] In detail, Figure 4 The diagram shows a schematic of the structure of the bushing of the oil-cooled motor rotor magnet or iron core sealing temperature measurement structure provided in 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.
[0036] 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.
[0037] More specifically, the thermocouple wire 52 is fixed in the wiring trough 41 by oil-resistant sealant.
[0038] 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.
[0039] Specifically, see Figure 1 and Figure 2 The remote sensing temperature device 7 is connected to the rotating shaft 4 via the temperature sensing flange 8.
[0040] Further, see Figure 2 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.
[0041] 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.
[0042] 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.
[0043] Next, the working principle of a sealed temperature measuring structure for an oil-cooled motor rotor magnet or iron core involved in the embodiments of this utility model will be explained.
[0044] The thermocouple temperature measuring head 51 of the temperature measuring thermocouple 5 is pre-embedded on the magnet 31 or iron core 33 of the rotor 3 to directly sense the real-time temperature of the magnet 31 or iron core 33.
[0045] After the thermocouple wire 52 is led out from the wiring hole 321 of the rotor end plate 32, it is laid in a direction along the wiring groove 41 on the surface of the shaft 4.
[0046] The thermocouple wire 52 passes through the inner side of the first bearing 42, the inner side of the bushing 6, and the inner side of the temperature measuring flange 8 in sequence, and is finally connected to the remote temperature sensing device 7;
[0047] The outer periphery of the bushing 6 is tightly fitted with the sealing lip of the oil seal 111 to form a rotary sealing interface, preventing coolant from seeping into the wiring groove.
[0048] The wiring trough 41 and the mating channels of each component provide contactless rotation guidance for the thermocouple wire 52, ensuring the stability of dynamic signal transmission;
[0049] Through the above-mentioned path design, the thermocouple wire 52 transmits the temperature signal of the magnet 31 or iron core 33 to the remote sensing temperature device 7 in real time without the risk of damage. After signal processing, the temperature of the magnet 31 or iron core 33 of the rotor 3 is dynamically monitored under all working conditions.
[0050] In summary, in this technical solution, the thermocouple temperature sensor is embedded in the rotor's magnet or core. A bushing is fitted onto the shaft and located inside the oil seal on the front cover. The outer circumference of the bushing is in close contact with the sealing lip at the center of the oil seal. A wiring hole is provided on the rotor's end plate, and a wiring groove is provided on the shaft. The thermocouple wires pass through the wiring hole and connect to the remote temperature sensing device via the wiring groove. In this configuration, firstly, the wiring is more efficient and convenient, eliminating the risk of wire breakage and failure, reducing thermocouple wear, and saving costs. Secondly, the bushing design prevents direct contact between the wiring groove and the oil seal, thus avoiding oil leakage. The tight contact between the bushing and the sealing lip at the center of the oil seal ensures good sealing of the oil-cooled motor's cooling cavity, enabling accurate measurement of the rotor magnet or core's real-time temperature under various operating conditions, ensuring that the product performance is not excessive and meets requirements.
[0051] In the embodiments disclosed in this utility model, 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 utility model according to the specific circumstances.
[0052] The above description is only a preferred embodiment of the present utility model. 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 utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. A sealed temperature measuring structure for the rotor magnet or iron core of an oil-cooled motor, comprising 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), wherein the rotating shaft (4) is rotatably connected to the front end cover (11) and the rear end cover (12), characterized in that, The sealed temperature measuring structure for the oil-cooled motor rotor magnet or iron core also includes: The temperature measuring thermocouple (5) includes a thermocouple 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) is fitted onto 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 Remote sensing temperature device (7) is located on the outside of the oil-cooled motor housing (1) and is mounted on the rotating shaft (4); The rotor (3) has a wiring hole (321) on its end plate (32) and a wiring groove (41) on its shaft (4). The thermocouple wire (52) passes through the wiring hole (321) and is connected to the remote sensing temperature device (7) through the wiring groove (41).
2. The sealed temperature measurement structure for the rotor magnet or core of an oil-cooled motor according to claim 1, characterized in that, The bushing (6) includes: The slotted end (61), located at one end of the bushing (6) near the rotor (3), has a threading groove (611) on its outer periphery to facilitate the threading of the thermocouple wires (52); and The mating end (62) is located at the end where the sealing lip of the bushing (6) and the oil seal (111) are in close contact, and its outer circumference is smooth and without grooves.
3. The sealed temperature measurement structure for the rotor magnet or core of an oil-cooled motor according to claim 2, characterized in that, The number of the threading grooves (611) corresponds to the number of the temperature measuring thermocouples (5).
4. The sealed temperature measuring structure for the rotor magnet or core of an oil-cooled motor according to claim 1, characterized in that, The thermocouple wire (52) is fixed in the wiring groove (41) by oil-resistant sealant.
5. The sealed temperature measuring structure for the rotor magnet or core of an oil-cooled motor according to claim 1, characterized in that, The remote sensing temperature sensing device (7) is connected to the rotating shaft (4) via a temperature sensing flange (8).
6. The sealed temperature measuring structure for the rotor magnet or core of an oil-cooled motor according to claim 5, characterized in that, The temperature measuring flange (8) is interference-fitted with the rotating shaft (4).
7. The sealed temperature measuring structure for the rotor magnet or core of an oil-cooled motor according to claim 1, characterized in that, The bushing (6) is interference-fitted with the rotating shaft (4).
8. The sealed temperature measuring structure for the rotor magnet or core of an oil-cooled motor according to claim 1, characterized in that, The rotating shaft (4) is rotatably connected to the front end cover (11) and the rear end cover (12) via the first bearing (42) and the second bearing (43), respectively.
9. The sealed temperature measuring structure for the rotor magnet or core of an oil-cooled motor according to claim 8, characterized in that, Both the first bearing (42) and the second bearing (43) are interference-fitted with the rotating shaft (4).
10. The sealed temperature measuring structure for the rotor magnet or core of an oil-cooled motor according to claim 1, characterized in that, The number of wiring holes (321) corresponds to the number of temperature measuring thermocouples (5).