Temperature measurement apparatus and method for motor winding

Abstract

The present invention relates to the technical field of motor temperature monitoring, and provides a temperature measurement apparatus and method for a motor winding. The temperature measurement apparatus comprises a motor housing, a thermally conductive structure, a fixation and adjustment structure, and a temperature measurement structure. The motor housing encloses an accommodating cavity, and is provided with a lead-out hole communicated with the accommodating cavity; the thermally conductive structure is located in the accommodating cavity and connected to the motor housing; the fixation and adjustment structure is connected to the outer surface of the motor housing; the temperature measurement structure comprises a temperature sensor, and the temperature sensor is connected to the fixation and adjustment structure; and the thermally conductive structure comprises a thermally conductive base, one end of the thermally conductive base is located between motor stator end windings, and a probe of the temperature sensor passes through the lead-out hole to be in contact with the thermally conductive base. The thermally conductive base is directly mounted in the motor housing, the thermally conductive base is used to extend between motor winding ends for heat transfer, and the temperature of the thermally conductive base is acquired by means of the temperature sensor, so as to accurately obtain the temperature of the motor winding ends.

Description

Motor winding temperature measuring device and temperature measuring method

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202410249404.8 and application date March 5, 2024, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present invention relates to the technical field of motor temperature monitoring, and in particular to a motor winding temperature measuring device and a temperature measuring method. Background Art

[0004] Motor winding temperature refers to the temperature of the motor's internal windings and is a key indicator of its operating status and safety. Motors generate significant heat during operation. Failure to dissipate this heat quickly can lead to excessive motor temperatures, potentially causing a range of faults, including insulation aging and winding burnout. Therefore, monitoring and controlling motor winding temperature is crucial for safe motor operation.

[0005] Currently, there are four main motor cooling methods: water cooling, forced air cooling, self-ventilation cooling, and natural cooling. When a fully enclosed motor is operating, in addition to the heat generated by the silicon steel magnetic conductive part and the effective part of the winding, a large amount of heat is also generated at the stator winding ends. Compared with open motors, the heat dissipation efficiency of the stator winding ends is greatly reduced, resulting in a large temperature gradient within the fully enclosed motor, with the winding end temperature much higher than the core temperature. Related technical solutions embed the temperature sensor probe into the stator core, and the winding temperature is transferred to the temperature detector through the core by heat conduction. However, due to the high temperature gradient between the stator core winding temperature and the stator end winding temperature, it is impossible to accurately detect the winding end temperature. Some solutions use the temperature difference method for conversion. The actual winding temperature changes dynamically due to the motor's operating speed, current, voltage, and torque, and the temperature gradient also changes dynamically, which also makes it impossible to accurately assess the motor winding end temperature. Summary of the Invention

[0006] The present invention provides a motor winding temperature measuring device and method to solve the problem of how to accurately obtain the motor winding temperature, while enabling online replacement detection, thereby improving the reliability and maintenance convenience of the motor.

[0007] An embodiment of the present invention provides a motor winding temperature measuring device, which includes a motor housing, which surrounds a housing cavity and has an outlet hole connected to the housing cavity; a heat-conducting structure, which is located in the housing cavity and connected to the motor housing; a fixed adjustment structure, which is connected to the outer surface of the motor housing; a temperature measuring structure, which includes a temperature sensor, and the temperature sensor is connected to the fixed adjustment structure; wherein the heat-conducting structure includes a heat-conducting seat, one end of the heat-conducting seat is located between the end windings of the motor stator, and the probe of the temperature sensor passes through the outlet hole and contacts the heat-conducting seat.

[0008] In some embodiments, the thermal seat includes a body and a thermal probe, the body is connected to the motor housing, and the body has a surrounding temperature measuring hole, and the thermal probe is located between the end windings of the motor stator.

[0009] In some embodiments, the heat-conducting structure further has a heat-conducting filling grease, the heat-conducting filling grease is located in the temperature measuring hole, and the heat-conducting filling grease wraps the probe of the temperature sensor.

[0010] In some embodiments, the probe of the temperature sensor has a limiting portion, a sealing ring is provided on one side of the limiting portion, a limiting end is provided in the temperature measuring hole, and the limiting portion and the limiting end are abutted via the sealing ring.

[0011] In some embodiments, a thermally conductive insulating material is filled between the end windings of the motor stator, and the thermally conductive insulating material is used to fix the thermal conductive probe.

[0012] In some embodiments, the fixed adjustment structure includes an adjustment bracket and a sensor mounting seat, the sensor mounting seat is fixed to the outer surface of the motor housing, and the temperature sensor is fixed on the adjustment bracket.

[0013] In some embodiments, the sensor mounting base has an adjustment screw hole, the adjustment bracket has an adjustment hole, and the size of the adjustment screw hole is smaller than the size of the adjustment hole.

[0014] An embodiment of the present invention also provides a method for measuring the temperature of a motor winding, which is used for the above-mentioned temperature measuring device. The temperature measurement method includes: passing the probe of the temperature sensor from the outside of the motor through the lead-out hole to contact the thermal seat; fixing the temperature sensor to the fixed adjustment structure; starting the motor, and obtaining the temperature of the thermal seat through the temperature sensor.

[0015] In some embodiments, the thermal seat includes a body and a thermal probe, the body has a temperature measuring hole formed by an enclosure, the thermal probe is located between the end windings of the motor stator, the probe of the temperature sensor has a limiting portion, and the temperature measuring hole has a limiting end; the step of passing the probe of the temperature sensor from the outside of the motor through the lead-out hole to contact the thermal seat includes: installing a sealing ring on one side of the probe limiting portion of the temperature sensor; extending the probe from the outside of the motor through the lead-out hole into the temperature measuring hole so that the limiting portion and the limiting end abut against each other through the sealing ring; starting the motor and obtaining the temperature of the thermal seat through the temperature sensor to obtain the temperature of the motor stator end winding includes: starting the motor, obtaining the temperature of the body through the temperature sensor, and then obtaining the temperature of the thermal probe to obtain the temperature of the motor stator end winding.

[0016] In some embodiments, the fixed adjustment structure includes an adjustment bracket having a probe hole; before installing the sealing ring on one side of the probe limit portion of the temperature sensor, passing the probe of the temperature sensor from the outside of the motor through the lead-out hole to contact the thermal seat also includes: aligning the probe hole of the adjustment bracket with the lead-out hole; fixing the temperature sensor to the fixed adjustment structure includes: fixing the temperature sensor to the adjustment bracket.

[0017] The present invention provides a motor winding temperature measuring device and a temperature measuring method. The temperature measuring device includes a motor housing, a heat-conducting structure, a fixed adjustment structure and a temperature measuring structure. The motor housing is surrounded to form an accommodating cavity and has an extraction hole connected to the accommodating cavity; the heat-conducting structure is located in the accommodating cavity and is connected to the motor housing; the fixed adjustment structure is connected to the outer surface of the motor housing; the temperature measuring structure includes a temperature sensor, and the temperature sensor is connected to the fixed adjustment structure; wherein the heat-conducting structure includes a heat-conducting seat, one end of the heat-conducting seat is located between the end windings of the motor stator, and a probe of the temperature sensor passes through the extraction hole and contacts the heat-conducting seat. By directly installing the thermal seat in the motor housing and extending one end of the thermal seat between the ends of the motor windings, the stability of the internal fixation of the thermal seat can be ensured to ensure the detection accuracy. The thermal seat directly obtains the temperature of the motor winding and realizes heat transfer on the thermal seat. By extending the temperature sensor into the motor housing and contacting it with the thermal seat, the temperature of the thermal seat is obtained through the temperature sensor, thereby obtaining the temperature of the motor winding ends. At the same time, in order to ensure the accuracy of the acquisition and the convenience of subsequent maintenance, a fixed adjustment structure is provided on the motor housing, and the temperature sensor can be fixed on the fixed adjustment structure. This can ensure the stability of the temperature sensor when obtaining the temperature in real time, and at the same time facilitate the replacement and maintenance of the temperature sensor, thereby improving maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG1 is a radial cross-sectional view of a motor winding temperature measuring device provided by an embodiment of the present invention;

[0019] FIG2 is a partial enlarged schematic diagram of part A in FIG1 ;

[0020] FIG3 is an axial cross-sectional view of a motor winding temperature measuring device provided by an embodiment of the present invention;

[0021] FIG4 is a partial enlarged schematic diagram of part B in FIG3 ;

[0022] FIG5 is a schematic structural diagram of an adjustment bracket in a temperature measurement device provided by an embodiment of the present invention;

[0023] FIG6 is a schematic structural diagram of a sensor mounting base in a temperature measurement device according to an embodiment of the present invention;

[0024] FIG7 is a flow chart of a method for measuring temperature of a motor winding provided by an embodiment of the present invention;

[0025] FIG8 is a flow chart of another method for measuring temperature of a motor winding provided by an embodiment of the present invention;

[0026] FIG9 is a flow chart of another method for measuring temperature of a motor winding provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] The various specific technical features described in the specific embodiments may be combined in any suitable manner, unless they are inconsistent. For example, different embodiments and technical solutions may be formed by combining different specific technical features. To avoid unnecessary repetition, the various possible combinations of the specific technical features in the present invention will not be described separately.

[0029] In the following description, the terms "first, second, ..." are used solely to distinguish different objects and do not imply any similarities or connections between the objects. It should be understood that the directional descriptions "above," "below," "outside," and "inside" refer to directions during normal use. The directions "left" and "right" refer to the left-right directions shown in the corresponding schematic diagrams, which may or may not be the left-right directions during normal use.

[0030] It should be noted that the terms "include," "comprises," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising that element. The term "connected," unless otherwise specified, includes both direct and indirect connections.

[0031] In a specific embodiment, the motor winding temperature measuring device is applicable to motors of any power type. For example, the temperature measuring device can be applied to high-power traction motors; for example, the temperature measuring device can also be applied to low-power ordinary motors. The motor winding temperature measuring device is also applicable to motors of any protection type. For example, the temperature measuring device can be applied to enclosed motors; for example, the temperature measuring device can also be applied to flameproof motors. For ease of explanation, the temperature measuring device is described below using the example of a high-power enclosed traction motor as an example. The temperature measurement method is implemented using the temperature measuring device.

[0032] In some embodiments, as shown in Figures 1 to 4, a temperature measurement device 100 includes a motor housing 110, a heat-conducting structure 120, a fixing and adjusting structure 130, and a temperature measurement structure 140. The motor housing 110 surrounds a receiving cavity 111 and has an outlet hole 112 communicating with the receiving cavity 111. The heat-conducting structure 120 is located within the receiving cavity 111 and connected to the motor housing 110.

[0033] Specifically, considering that fully enclosed traction motors have the advantages of high efficiency, high speed, large torque, and long life, they are widely used in transportation vehicles such as railway locomotives, electric vehicles, and electric boats. Therefore, the motor is the core power component of the transportation vehicle and requires high speed to provide traction power. The speed of the traction motor is generally above several thousand revolutions per minute, which is much higher than that of ordinary motors. Therefore, the heat generation of the fully enclosed traction motor is also much greater than that of ordinary motors. Therefore, it is necessary to accurately obtain the temperature of the motor stator end winding 150, that is, the maximum temperature that the motor winding insulation structure can withstand in actual use, reasonably set the motor application boundary, improve the service life of the insulation structure, and improve the reliability of the motor product.

[0034] Therefore, considering the internal structure of the motor, the temperature sensor 141 cannot directly penetrate between the motor stator end windings 150 to measure the temperature. An extraction hole 112 is provided on the motor housing 110. The size of the extraction hole 112 is not limited, as long as the probe 1411 of the temperature sensor 141 can pass through the extraction hole 112. A heat-conducting structure 120 is installed in the accommodating cavity 111 inside the motor housing 110. The heat-conducting structure 120 can be understood as any device or structure capable of efficient heat conduction. The heat-conducting structure 120 includes a heat-conducting seat 121. One end of the heat-conducting seat 121 is located between the motor stator end windings 150. The detailed installation steps are as follows: during the motor assembly process, after the motor stator is assembled, one end of the heat-conducting seat 121 is buried between the motor stator end windings 150. Considering that there is vibration during the operation of the motor, in order to prevent the heat-conducting seat 121 from shaking due to vibration, the heat-conducting seat 121 is fixed to the motor housing.

[0035] It should be emphasized here that the accuracy of the detection depends on preventing heat loss from the thermal base 121. Therefore, to minimize heat diffusion, the thermal base 121 illustratively includes a body 1211 and a thermal probe 1212. The body 1211 and the thermal probe 1212 are connected and can be an integrated structure. The body 1211 is fixed to the motor housing, and the thermal probe 1212 is embedded between the motor stator end windings 150. The body 1211 surrounds a temperature measuring hole 1214. The size of the temperature measuring hole 1214 is roughly the same as that of the lead-out hole 112, and it is sufficient to ensure that the probe 1411 of the temperature sensor 141 can extend into the temperature measuring hole 1214. At the same time, the depth of the temperature measuring hole 1214 is not limited, as long as the probe 1411 of the temperature sensor 141 can contact the bottom of the temperature measuring hole 1214. The contact here can be direct contact or indirect contact. The indirect contact can be contact between the two through a heat-conducting material. In order to facilitate the temperature sensor 141 to extend into the temperature measuring hole 1214, the main body 1211 is positioned by the installation key 1213 to ensure that the temperature measuring hole 1214 is aligned with the lead-out hole 112. Considering that the temperature sensor 141 obtains the temperature of the motor stator end winding 150 by obtaining the temperature of the thermal seat 121, in order to make the temperature gradient between the temperature of the thermal seat 121 and the motor stator end winding 150 as close to 0 as possible, the thermal probe 1212 is made of a high thermal conductivity elastic composite material, for example, thermal conductive composite glue. When the probe 1411 of the temperature sensor 141 is extended into the bottom of the temperature measuring hole 1214, it is ensured that the temperature gradient of the motor stator end winding 150 is close to 0 when the temperature is transferred to the probe 1411 of the temperature sensor 141.

[0036] Taking into account the problem of vibration during the operation of the motor, in order to avoid the reduction of the detection accuracy of the temperature sensor 141 due to vibration, the temperature measuring device 100 also includes a fixed adjustment structure 130. The fixed adjustment structure 130 is fixedly connected to the outer surface of the motor housing. Its function is to fix the temperature sensor 141 and prevent the temperature sensor 141 from shaking relative to the motor. The specific structural form of the fixed adjustment structure 130 is not limited, and it only needs to meet the requirements of fixing the temperature sensor 141. The fixed adjustment structure 130 can be a separate component or a part of the motor housing 110.

[0037] Exemplarily, the fixed adjustment structure 130 includes an adjustment bracket 131 and a sensor mounting base 132. The adjustment bracket 131 has an adjustment hole 1311, a probe hole 1312 and a fixing hole 1313. The sensor mounting base 132 is fixed to the outer surface of the motor housing 110. The probe 1411 of the temperature sensor 141 passes through the probe hole 1312 and the lead-out hole 112 to enter the temperature measuring hole 1214. The temperature sensor 141 is fixed to the adjustment bracket 131 by a bolt 133 passing through the fixing hole 1313 and being tightened with a fixing nut 136. The temperature sensor 141 on the adjustment bracket 131 is connected to the bracket by a bolt 133 passing through a spring washer 134, an adjustment washer 135, and an adjustment hole 1311 to be screwed into the adjustment screw hole 1321 to ensure that the probe hole 1312 is aligned with the lead-out hole 112, so that the adjustment bracket 131 and the temperature sensor 141 are fixed to the sensor mounting base 132, and thus fixed to the motor housing.

[0038] It should be emphasized here that this application takes into account that the temperature measuring structure 140 is easily damaged and requires timely maintenance. The thermal conductive seat 121 adopted in this solution is built into the motor, and the temperature sensor 141 is external to the motor. Therefore, the temperature sensor 141 and related components in the temperature measuring structure 140 can be replaced online. There is no need to park the vehicle in the maintenance area and disassemble the motor. The platform alone can meet the replacement needs, which improves the efficiency of maintenance and meets the needs of online replacement of high-response accuracy fully enclosed traction motor winding temperature measurement.

[0039] The present invention provides a motor winding temperature measuring device 100 and a temperature measuring method. The temperature measuring device 100 includes a motor housing 110, a heat-conducting structure 120, a fixed adjustment structure 130 and a temperature measuring structure 140. The motor housing 110 surrounds a receiving cavity 111 and has an outlet hole 112 connected to the receiving cavity 111; the heat-conducting structure 120 is located in the receiving cavity 111 and is connected to the motor housing 110; the fixed adjustment structure 130 is connected to the outer surface of the motor housing 110; the temperature measuring structure 140 includes a temperature sensor 141, and the temperature sensor 141 is connected to the fixed adjustment structure 130; wherein the heat-conducting structure 120 includes a heat-conducting seat 121, one end of the heat-conducting seat 121 is located between the end windings 150 of the motor stator, and a probe 1411 of the temperature sensor 141 passes through the outlet hole 112 and contacts the heat-conducting seat 121. By directly installing the thermal seat 121 in the motor housing 110 and extending one end of the thermal seat 121 between the ends of the motor windings, the stability of the internal fixation of the thermal seat 121 can be ensured to ensure the detection accuracy. The thermal seat 121 directly obtains the temperature of the motor windings and realizes heat transfer on the thermal seat 121. By extending the temperature sensor 141 into the motor housing 110 and contacting the thermal seat 121, the temperature of the thermal seat 121 is obtained by the temperature sensor 141, thereby obtaining the temperature of the motor winding ends. At the same time, in order to ensure the accuracy of the acquisition and the convenience of subsequent maintenance, a fixed adjustment structure 130 is provided on the motor housing, and the temperature sensor 141 can be fixed on the fixed adjustment structure 130. This can ensure the stability of the temperature sensor 141 when obtaining the temperature in real time, and at the same time facilitate the replacement and maintenance of the temperature sensor 141, thereby improving maintenance efficiency.

[0040] In some embodiments, as shown in FIG. 1 and FIG. 2 , the heat-conducting structure 120 further includes a heat-conducting filling grease 122 . The heat-conducting filling grease 122 is located in the temperature measuring hole 1214 and wraps the probe 1411 of the temperature sensor 141 . Specifically, considering that when the probe 1411 of the temperature sensor 141 is inserted into the temperature measuring hole 1214 to measure the temperature, there must be a gap between the probe 1411 of the temperature sensor 141 and the inner wall surface of the temperature measuring hole 1214, the probe 1411 of the temperature sensor 141 will inevitably drive air into the temperature measuring hole 1214 when it is inserted into the temperature measuring hole 1214. The flow of air may affect the detection accuracy of the probe 1411 of the temperature sensor 141. In order to avoid the interference of air flow, the thermal conductive structure 120 also has thermal conductive filling grease 122, and the thermal conductive filling grease 122 fills the temperature measuring hole 1214. When the probe 1411 of the temperature sensor 141 is inserted into the temperature measuring hole 1214, the probe 1411 is wrapped by the thermal conductive filling grease 122, thereby avoiding the influence of air. At the same time, the thermal conductive filling grease 122 can also better transfer the heat of the thermal seat 121 to the probe 1411.

[0041] In some embodiments, as shown in Figures 1 and 2, the probe 1411 of the temperature sensor 141 has a limiting portion 1412, a sealing ring 1413 is provided on one side of the limiting portion 1412, a limiting end 1215 is provided in the temperature measuring hole 1214, and the limiting portion 1412 and the limiting end 1215 are abutted through the sealing ring 1413. Specifically, considering that the probe 1411 of the temperature sensor 141 will inevitably drive air into the temperature measuring hole 1214 when it is inserted into the temperature measuring hole 1214, the flow of air may affect the detection accuracy of the probe 1411 of the temperature sensor 141. In order to avoid the interference of the air flow, the probe 1411 of the temperature sensor 141 has a limiting portion 1412, which is a convex structure. The temperature measuring hole 1214 has a limiting end 1215, and the limiting end 1215 cooperates with the limiting portion 1412. When the probe 1411 of the temperature sensor 141 is inserted into the temperature measuring hole 1214, the limiting portion 1412 and the limiting end 1215 abut and seal, which can prevent the air flow from entering the bottom of the temperature measuring hole 1214 and affecting the temperature detected by the probe 1411. At the same time, it can also prevent the probe 1411 of the temperature sensor 141 from colliding with the bottom of the temperature measuring hole 1214 during the rapid insertion process, causing damage to the probe 1411. In order to improve the sealing effect, a sealing ring 1413 is provided on one side of the limiting portion 1412, and the limiting portion 1412 is abutted against the limiting end 1215 through the sealing ring 1413. If there is thermal conductive filling grease 122 in the temperature measuring hole 1214, the limiting portion 1412 and the sealing ring 1413 can also be used to seal the thermal conductive filling grease 122 to prevent the loss of air from the thermal conductive filling grease 122 during operation, thereby ensuring the accuracy of the detection.

[0042] In some embodiments, as shown in FIG. 2 , a thermally conductive insulating material 151 is filled between the motor stator end windings 150 , and the thermally conductive insulating material 151 is used to fix the thermal conductive probe 1212 . Specifically, considering that the thermal conductive probe 1212 needs to be embedded between the motor stator end windings 150 to obtain the temperature, due to the gaps between the motor stator end windings 150, the thermal conductive probe 1212 may shake between the motor stator end windings 150. Especially when the motor is running at high speed, the vibration effect is more obvious. Under the action of vibration, the thermal conductive probe 1212 may have problems such as deviation and shaking, which may affect the transmission of the temperature of the thermal conductive probe 1212. In order to ensure the accuracy of the detection, the thermal conductive probe 1212 is embedded between the motor stator end windings 150 and fixed with a thermal conductive insulating material 151. The thermal conductive insulating material 151 can be an insulating material with good thermal conductivity, such as a silicone glass fiber composite material. The thermal conductive insulating material 151 is filled between the motor stator end windings 150, and the thermal conductive probe 1212 is embedded in the thermal conductive insulating material 151 between the motor stator end windings 150 for fixation.

[0043] In some embodiments, as shown in Figures 4, 5, and 6, the sensor mounting base 132 has an adjustment screw hole 1321, and the adjustment bracket 131 has an adjustment hole 1311. To ensure better alignment between the probe hole 1312 and the outlet hole 112, the adjustment bracket 131 can be moved. After the probe hole 1312 is aligned with the outlet hole 112, the adjustment bracket 131 is fixed. Therefore, to facilitate the movement and fixation of the adjustment bracket 131, the size of the adjustment screw hole 1321 is smaller than the size of the adjustment hole 1311. Exemplarily, the adjustment screw hole 1321 is M6, the diameter of the adjustment hole 1311 is 10 cm, the specification of the adjustment washer 135 can be D8, the specification of the bolt 12 is M6, and the specification of the spring washer is D6.

[0044] This embodiment also provides a method for measuring the temperature of a motor winding, as shown in FIG7 . This method is applicable to a temperature measuring device 100 as shown in any one of FIG1 to FIG6 . FIG7 is a flow chart of a method for measuring the temperature of a motor winding provided by an embodiment of the present invention. The flow of this method includes:

[0045] Step S100: insert the probe of the temperature sensor from the outside of the motor through the lead-out hole to contact the heat-conducting seat.

[0046] Specifically, after the motor is assembled, one end of the thermal base 121 is embedded between the motor stator end windings 150. The probe 1411 of the temperature sensor 141 is inserted from the outside of the motor through the lead-out hole 112 into the motor to contact the thermal base 121. This contact can be direct or indirect, with indirect contact being through a thermally conductive material.

[0047] Step S200: Fix the temperature sensor to the fixed adjustment structure.

[0048] Specifically, after the probe 1411 of the temperature sensor 141 is inserted into the contact point between the motor and the thermal seat 121, the temperature sensor 141 is fixed on the fixed adjustment structure 130. Since the temperature sensor 141 is external to the motor, the temperature sensor 141 and related components in the temperature measurement structure 140 can be replaced online. For example, if the temperature sensor 141 is damaged or the detection accuracy of the temperature sensor 141 decreases, the old sensor can be directly removed at the platform and a new sensor can be installed. There is no need to park the vehicle in the maintenance area and disassemble the motor. The platform alone can meet the replacement needs, thereby improving maintenance efficiency.

[0049] Step S300: start the motor and obtain the temperature of the heat conducting seat through the temperature sensor.

[0050] Specifically, after the temperature sensor 141 is fixed, the motor can be started. During the operation of the motor, the temperature of the motor stator end winding 150 is transferred to the temperature measuring structure 140 in a nearly zero-gradient manner through the heat-conducting structure 120. The temperature of the motor stator end winding 150 is transferred to the heat-conducting seat 121, and the heat-conducting seat 121 transfers the temperature to the probe 1411 of the temperature sensor 141, thereby accurately reflecting the temperature of the motor winding end, and realizing online high response accuracy and online maintenance of the maximum temperature of the fully enclosed traction motor winding.

[0051] In some embodiments, the thermal base 121 includes a body 1211 and a thermal probe 12121411. The body 1211 has a surrounding temperature measuring hole 1214. The thermal probe 12121411 is located between the motor stator end windings 150. The probe 1411 of the temperature sensor 141 has a limiting portion 1412. The temperature measuring hole 1214 has a limiting end 1215. As shown in FIG8, FIG8 is a flow chart of another motor winding temperature measurement method provided by an embodiment of the present invention. Based on FIG7, step S100 in FIG7 is to pass the probe of the temperature sensor from the outside of the motor through the lead-out hole to contact the thermal base, including:

[0052] Step S110: Install the sealing ring on one side of the probe limiting portion of the temperature sensor.

[0053] Specifically, considering that the probe 1411 of the temperature sensor 141 will inevitably drive air into the temperature measuring hole 1214 when it is extended into the temperature measuring hole 1214, the flow of air may affect the detection accuracy of the probe 1411 of the temperature sensor 141. In order to avoid the interference of air flow, the probe 1411 of the temperature sensor 141 has a limiting portion 1412, and the limiting portion 1412 is a raised structure. The sealing ring 1413 is installed on one side of the limiting portion 1412 of the probe 1411 of the temperature sensor 141.

[0054] In step S120 , the probe is inserted from the outside of the motor through the lead-out hole and into the temperature measuring hole, so that the limiting portion and the limiting end are in contact with each other through the sealing ring.

[0055] Specifically, after installing the sealing ring 1413, the probe 1411 of the temperature sensor 141 is extended from the outside of the motor through the lead-out hole 112 into the temperature measuring hole 1214. During the slow extension process, the limiting part 1412 and the limiting end 1215 are abutted and sealed through the sealing ring 1413. If there is thermal conductive filling grease 122 in the temperature measuring hole 1214, the limiting part 1412 and the sealing ring 1413 can also be used to seal the thermal conductive filling grease 122 to prevent the loss of air from the thermal conductive filling grease 122 during operation, thereby ensuring the accuracy of the detection.

[0056] Step S300 in FIG7 starts the motor, obtains the temperature of the thermal seat through the temperature sensor, and thus obtains the temperature of the motor stator end winding, which includes: step S310, starts the motor, obtains the temperature of the body through the temperature sensor, and then obtains the temperature of the thermal probe, thereby obtaining the temperature of the motor stator end winding.

[0057] Specifically, after the temperature sensor 141 is fixed, the temperature of the motor stator end winding 150 is transferred to the body 1211 of the thermal seat 121 in a manner with almost zero gradient through the thermal probe 12121411, and the body 1211 of the thermal seat 121 is transferred to the probe 1411 of the temperature sensor 141 in a manner with almost zero gradient, thereby accurately reflecting the temperature of the motor winding end.

[0058] In some embodiments, the fixed adjustment structure 130 includes an adjustment bracket 131, and the adjustment bracket 131 has a probe hole 1312, as shown in FIG9, which is a flow chart of another motor winding temperature measurement method provided by an embodiment of the present invention. Based on FIG8, before the sealing ring is installed on one side of the probe limit portion of the temperature sensor in step S110 in FIG9, step S100 further includes:

[0059] Step S130: aligning the probe hole of the adjustment bracket with the lead-out hole.

[0060] Specifically, in order to facilitate the detection of the temperature sensor 141, it is necessary to ensure that the probe hole 1312 is better aligned with the lead-out hole 112. Therefore, after the motor is installed, before the probe 1411 of the temperature sensor 141 is inserted from the outside of the motor through the lead-out hole 112 into the motor and contact the thermal seat 121, the adjustment bracket 131 is moved to align the probe hole 1312 with the lead-out hole 112.

[0061] Step S200 in FIG8 , fixing the temperature sensor to the fixed adjustment structure, includes: step S210 , fixing the temperature sensor to the adjustment bracket.

[0062] Specifically, after the probe 1411 of the temperature sensor 141 is extended into the temperature measuring hole 1214 of the motor, the temperature sensor 141 is fixed to the adjustment bracket 131 by means of a bolt 133 passing through the fixing hole 1313 and being tightened with the fixing nut 136. The temperature sensor 141 on the adjustment bracket 131 is connected to the bracket and is screwed into the adjustment screw hole 1321 using a bolt 133 through a spring washer 134, an adjusting washer 135, and an adjusting hole 1311 to ensure that the probe hole 1312 is aligned with the lead-out hole 112, so that the adjustment bracket 131 and the temperature sensor 141 are fixed on the sensor mounting base 132, and thus fixed on the housing of the motor.

[0063] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

1. A motor winding temperature measuring device, wherein: include: The motor housing surrounds and forms a receiving cavity and has an outlet hole communicating with the receiving cavity; a heat-conducting structure, located in the accommodating cavity and connected to the motor housing; A fixed adjustment structure connected to the outer surface of the motor housing; A temperature measuring structure, comprising a temperature sensor, wherein the temperature sensor is connected to the fixed adjustment structure; Wherein, the heat-conducting structure includes a heat-conducting seat, one end of which is located between the end windings of the motor stator, and the probe of the temperature sensor passes through the lead-out hole and contacts the heat-conducting seat.

2. The temperature measuring device according to claim 1, wherein: The thermal conductive seat includes a body and a thermal conductive probe. The body is connected to the motor housing and has a surrounding temperature measuring hole. The thermal conductive probe is located between the end windings of the motor stator.

3. The temperature measuring device according to claim 2, wherein: The heat-conducting structure further comprises heat-conducting filling grease, wherein the heat-conducting filling grease is located in the temperature measuring hole and wraps the probe of the temperature sensor.

4. The temperature measuring device according to claim 2, wherein: The probe of the temperature sensor has a limiting portion, a sealing ring is provided on one side of the limiting portion, a limiting end is provided in the temperature measuring hole, and the limiting portion and the limiting end are in contact with each other through the sealing ring.

5. The temperature measuring device according to claim 2, wherein: The space between the motor stator end windings is filled with heat-conducting insulating material, and the heat-conducting insulating material is used to fix the heat-conducting probe.

6. The temperature measuring device according to claim 1, wherein: The fixed adjustment structure includes an adjustment bracket and a sensor mounting seat. The sensor mounting seat is fixed to the outer surface of the motor housing, and the temperature sensor is fixed on the adjustment bracket.

7. The temperature measuring device according to claim 6, wherein: The sensor mounting seat has an adjusting screw hole, the adjusting bracket has an adjusting hole, and the size of the adjusting screw hole is smaller than the size of the adjusting hole.

8. A method for measuring the temperature of a motor winding, wherein: The temperature measurement method is used for the temperature measurement device according to any one of claims 1 to 7, and the temperature measurement method includes: Passing the probe of the temperature sensor from the outside of the motor through the lead-out hole to contact the heat-conducting seat; Fixing the temperature sensor to the fixed adjustment structure; The motor is started, and the temperature of the heat conducting seat is obtained through the temperature sensor.

9. The temperature measurement method according to claim 8, wherein: The thermal conductive seat includes a body and a thermal conductive probe, the body has a surrounding temperature measuring hole, the thermal conductive probe is located between the end windings of the motor stator, the probe of the temperature sensor has a limiting portion, and the temperature measuring hole has a limiting end; The step of passing the probe of the temperature sensor from the outside of the motor through the lead-out hole to contact the heat-conducting seat comprises: Installing a sealing ring on one side of the probe limiting portion of the temperature sensor; Insert the probe from the outside of the motor through the lead-out hole into the temperature measuring hole, so that the limiting portion abuts against the limiting end through the sealing ring; The starting motor obtains the temperature of the heat conducting seat by the temperature sensor, thereby obtaining the temperature of the motor stator end winding, which includes: The motor is started, and the temperature of the body is acquired through the temperature sensor, and then the temperature of the thermal conductivity probe is acquired, thereby obtaining the temperature of the stator end winding of the motor.

10. The temperature measurement method according to claim 9, wherein: The fixed adjustment structure includes an adjustment bracket, and the adjustment bracket has a probe hole; The step of passing the probe of the temperature sensor from the outside of the motor through the lead-out hole to contact the heat-conducting seat further comprises: Aligning the probe hole of the adjustment bracket with the lead-out hole; The fixing of the temperature sensor to the fixing adjustment structure comprises: Fix the temperature sensor to the adjustment bracket.

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