Temperature measuring device and stator assembly

Abstract

The utility model relates to a temperature measuring device and a stator assembly. The temperature measuring device comprises a temperature sensor and a holder, the holder is provided with an axially extending insertion portion, the temperature sensor is fixed to the insertion portion, the insertion portion carries the temperature sensor to be inserted between two adjacent stator windings, and the temperature sensor is fixed to the holder. The temperature sensor is used for measuring the operating temperature of the stator winding. The retainer of the temperature measuring device is provided with the insertion part which extends axially, and the temperature sensor is fixed in the insertion part and is inserted into the gap of the stator winding along with the insertion part, so that the convenience of a sensor installation process and the stability after installation are improved, and the measurement accuracy of the sensor is also improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a temperature measuring device and a stator assembly. Background Art

[0002] There are currently two technical solutions for fixing temperature sensors in concentrated winding motors. One is to use adhesive to fix the sensor and the winding copper wire between two stator teeth. The other is to use a cable clamp to fix the cable and embed the sensor into the gap between two stator teeth.

[0003] However, as a chemical substance, adhesives have specific requirements for storage environment and a relatively short shelf life, which increases the complexity and cost of material management. Using adhesives to fix sensors will make the process more complicated. In addition, to prevent the adhesive from solidifying, special tools may be required and heat curing treatment may be required. This process is not only difficult to operate, but also difficult to monitor and inspect the fixing quality, which is not conducive to production efficiency and product quality assurance.

[0004] When using a cable clamp, the clamping force and position are uncontrollable, and the sensor is easily affected by the flow of oil and displaced, resulting in large fluctuations in temperature data between measurement points and poor stability. When the cable notch size is too large, a large gap may appear between the sensor and the winding copper wire, which not only affects the clamping stability, but may also cause a decrease in temperature measurement accuracy, making it impossible to ensure the precise temperature control performance of the equipment.

[0005] It can be seen that whether it is fixed by adhesive or cable clamp, there are disadvantages to varying degrees, which restrict the efficiency of sensor installation process and the improvement of detection accuracy, and are not conducive to achieving efficient and accurate temperature monitoring and control. Therefore, it is urgent to develop a new sensor fixing method to overcome the defects in related technologies. Utility Model Content

[0006] In order to overcome the problems existing in the related art, the present disclosure provides a temperature measuring device and a stator assembly.

[0007] According to a first aspect of an embodiment of the present disclosure, the present disclosure provides a temperature measuring device, which is applied to a stator assembly, and the temperature measuring device includes: a temperature sensor; and a retaining frame, wherein the retaining frame is provided with an axially extending insertion portion, the temperature sensor is fixed to the insertion portion, and the insertion portion carries the temperature sensor and is inserted between the stator windings of two adjacent stator assemblies for measuring the temperature of the stator windings during operation.

[0008] In some embodiments, a sensor groove is disposed in the head end of the insertion portion, and the inner contour of the sensor groove matches the outer contour of the temperature sensor to clamp and fix the temperature sensor.

[0009] In some embodiments, the thickness of the insert portion at the head end is greater than the spacing between two adjacent stator windings, so as to enable the insert portion to have an interference fit with the two adjacent stator windings and to enable the temperature sensor to fit tightly with the stator winding.

[0010] In some embodiments, the temperature measuring device also includes a cable, which is electrically connected to the temperature sensor, wherein a wiring groove is also provided in the insertion portion, and the wiring groove is connected to the sensor groove for fixing the cable located in the insertion portion.

[0011] In some embodiments, the retainer is The retaining frame further comprises a radial portion extending radially, wherein a limiting opening is provided at the connection between the insertion portion and the radial portion, the limiting opening allows the cable to pass through a side of the radial portion away from the insertion portion and enter the wiring groove, thereby securing the cable.

[0012] In some embodiments, the radial portion is provided with a socket, which is located on a side of the radial portion away from the insertion portion and is used to fix the cable.

[0013] In some embodiments, a fixing clip is provided on a side of the radial portion close to the insertion portion, and the fixing clip is used to be clamped on the winding bracket of the stator assembly to limit the radial position of the retaining frame.

[0014] In some embodiments, the fixing clip is provided with a fixing surface on a side surface facing away from the inserting portion, and the fixing surface is used to abut against a pushing pin of the busbar of the stator assembly to limit the axial position of the retaining frame.

[0015] In some embodiments, the exterior of the head end is provided with a chamfer.

[0016] In some embodiments, the temperature measurement device further includes a connector, and the connector is electrically connected to the temperature sensor through the cable.

[0017] In some embodiments, the temperature sensor is a negative temperature coefficient thermistor.

[0018] According to a first aspect of an embodiment of the present disclosure, the present disclosure provides a stator assembly, comprising: a stator core, the inner circumference of which is provided with a plurality of circumferentially spaced stator teeth; a stator winding, wound and fixed on the stator teeth; and a temperature measuring device as described in the first aspect, the temperature measuring device being used to measure the temperature of the stator winding during operation.

[0019] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: the retaining frame of the temperature measuring device has an axially extending insertion portion, the temperature sensor is fixed to the insertion portion, and is inserted into the gap of the stator winding along with the insertion portion, which not only improves the convenience of the sensor installation process and the stability after installation, but also improves the accuracy of the sensor measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0021] Figure 1 is a partial structural perspective view of a stator assembly with a temperature measuring device according to an exemplary embodiment;

[0022] Figure 2 yes Figure 1 A three-dimensional cross-sectional view of a stator assembly at a temperature measuring device;

[0023] Figure 3 is a cross-sectional view of a stator winding at a temperature measuring device according to an exemplary embodiment;

[0024] Figure 4 is a three-dimensional diagram of a temperature measuring device according to an exemplary embodiment;

[0025] Figure 5 yes Figure 4 A schematic diagram of the three-dimensional structure of the retaining frame in the temperature measuring device;

[0026] Figure 6 yes Figure 4 An enlarged schematic diagram of the cooperation between the insertion portion of the retainer and the temperature sensor at the head end;

[0027] Figure 7 yes Figure 6 A schematic diagram of the thickness of the insert portion carrying the temperature sensor at the head end and the gap between the stator windings;

[0028] Figure 8 It is a schematic diagram of the cooperation between the fixing clip of the retaining frame and the winding bracket according to an exemplary embodiment. DETAILED DESCRIPTION

[0029] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0030] In the present disclosure, unless otherwise specified, the axial direction A, radial direction R, and circumferential direction W are the axial direction A, radial direction R, and circumferential direction W of a designated subassembly, respectively.

[0031] In order to solve the above technical problems, the present disclosure provides a temperature measuring device 100, which is applied to a stator assembly. The temperature measuring device 100 is used to measure the temperature of the stator assembly 200 during operation.

[0032] like Figures 1 to 3 As shown, the stator assembly 200 at least includes a stator core 50, a winding support 60, a stator winding 70 and a bus 80. The inner circumference of the stator core 50 is provided with a plurality of stator teeth 51 spaced circumferentially W, and the stator winding 70 is wound and fixed on the stator teeth 51. The outer wall of the stator tooth 51 is provided with a winding support 60, which is used to provide stable support for the stator winding 70 and ensure the standardization and compactness of the layout of the stator winding 70. The bus 80 is located at one axial end of the stator winding 70 and is used to converge the lead wires in the plurality of stator windings 70. The stator winding 70 in the stator assembly 200 is energized to generate a rotating magnetic field. Therefore, when the stator assembly 200 is energized and operated, it is particularly important to monitor the temperature of the stator winding 70. The temperature measuring device 100 is used to measure the temperature of the stator winding 70 when it is energized and operated.

[0033] Specifically, Figure 4 As shown, the temperature measuring device 100 includes a connector 10, a cable 20, a temperature sensor 30 and a retaining frame 40. The cable 20 is connected between the temperature sensor 30 and the connector 10, and the signal in the temperature sensor 30 is transmitted to the connector 10 through the cable 20, and then transmitted to the controller of the motor by the connector 10.

[0034] The temperature sensor 30 and part of the cable 20 are installed in the retaining frame 40. Figure 5 As shown, the retainer 40 is generally The retainer 40 includes a radial portion 41 extending in the radial direction R and an insertion portion 42 extending in the axial direction A. The temperature sensor 30 is fixed to the insertion portion 42, and the insertion portion 42 carries the temperature sensor 30 and is inserted between the stator windings 70 of two adjacent stator assemblies 200, so as to measure the temperature of the stator windings 70 in real time and accurately during operation.

[0035] The retainer 40 is provided with an insertion portion 42 extending in the axial direction A, and the insertion portion 42 is used to fix and install the temperature sensor 30. Since the entire retainer 40 is made of hard material, the firmness and stability of the entire retainer 40 are ensured. When the temperature sensor 30 is embedded in the gap of the stator winding 70 along with the insertion portion 42, the firm insertion portion 42 can be easily inserted, which greatly improves the convenience of the installation operation and helps to reduce the process cost. At the same time, due to the hardness of the insertion portion 42, the temperature sensor 30 can remain stable between the stator winding 70 after being installed, and will not be displaced by factors such as oil flow, thereby effectively improving the accuracy and reliability of the temperature sensor 30 in measuring temperature in the working state.

[0036] like Figure 5 As shown, in this embodiment, the axial length of the insertion portion 42 can be set according to the axial length of the stator winding 70, ensuring that the insertion portion 42 carrying the temperature sensor 30 can accurately penetrate into the highest temperature point inside the stator winding 70, that is, the "central hot spot" of the stator winding 70, thereby achieving direct and accurate measurement of the working temperature of the stator winding 70, providing crucial data support for monitoring the operating status of the motor and fault warning.

[0037] In some embodiments, Figure 5 As shown, a sensor slot 421 is provided in the head end of the insertion portion 42. Figure 6 As shown, the inner contour of the sensor groove 421 matches the outer contour of the temperature sensor 30 . Preferably, the inner contour of the sensor groove 421 is smaller than the outer contour of the temperature sensor 30 , so that the sensor groove 421 is tightly clamped and fixed to the temperature sensor 30 .

[0038] This ensures that the temperature sensor 30 can be firmly fixed in the sensor slot 421 after installation and is not easily loosened or shifted due to factors such as vibration and oil impact, thereby ensuring that the temperature sensor 30 can always maintain an accurate measurement position during operation, effectively improving the accuracy and stability of temperature measurement.

[0039] In some embodiments, Figure 7As shown, the thickness of the insertion portion 42 at least at the head end is greater than the spacing between two adjacent stator windings 70. When the insertion portion 42 is inserted into the gap of the stator winding 70, it can form an interference fit relationship with the stator windings 70 on both sides, so that there is a certain pressure contact between the insertion portion 42 and the stator winding 70, which not only improves the stability of the insertion portion 42 in the stator winding 70, but also ensures that the insertion portion 42 and the temperature sensor 30 therein can fit tightly to the copper wire surface of the stator winding 70. In this way, the temperature sensor 30 can measure the temperature change of the stator winding 70 more directly and effectively, thereby improving the measurement accuracy. At the same time, the close fit also helps to reduce the air gap between the sensor and the winding, enhance the heat transfer efficiency, and further improve the sensitivity of temperature monitoring.

[0040] In some embodiments, Figure 5 and Figure 6 As shown, a chamfer 423 is provided on the outside of the head end of the insertion portion 42. The chamfer 423 allows the insertion portion 42 to be inserted into the gap between the stator windings 70 more smoothly and lightly, reduces the insertion resistance, and improves the installation efficiency. At the same time, the smooth transition characteristics of the chamfer 423 effectively avoid scratching or collision of the copper wire of the stator winding 70 during the insertion process, reduces the potential risk of damage, and is conducive to protecting the key components inside the motor and ensuring the long-term stable operation of the motor.

[0041] In some embodiments, Figure 5 As shown, a wiring groove 422 is also provided in the insertion portion 42, and the wiring groove 422 is connected to the sensor groove 421, providing a dedicated channel for the layout of the cable 20. Figure 6 As shown, the inner contour of the wiring groove 422 matches the size of the cable 20, forming a moderate interference fit, ensuring that the cable 20 can be firmly fixed in the wiring groove 422, which helps the cable 20 maintain a neat and orderly layout and avoid movement due to vibration and other reasons during the operation of the motor, thereby effectively preventing the movement of the cable 20 from interfering with the measurement of the temperature sensor 30, thereby ensuring the accuracy and stability of the temperature measurement.

[0042] like Figure 5 As shown, the sensor slot 421 and the wiring slot 422 at the insertion portion 42 are connected, which simplifies the connection path between the cable 20 and the temperature sensor 30. At the same time, the sensor slot 421 and the wiring slot 422 are both slot structures opened on the side, which is conducive to improving the installation efficiency and maintenance convenience of the temperature sensor 30 and the cable 20. In some other embodiments, the sensor slot 421 and the wiring slot 422 can also be opened on both sides, so that the temperature sensor 30 can simultaneously receive the temperature of the stator windings 70 on both sides.

[0043] In some embodiments, Figure 5As shown, a limiting opening 424 is provided at the connection between the insertion portion 42 and the radial portion 41. The limiting opening 424 allows the cable 20 to pass through the radial portion 41 on the side away from the insertion portion 42 and enter the wiring groove 422. At the same time, it can also play a role in fixing the cable 20 to prevent the cable 20 from being displaced during the wiring process.

[0044] Furthermore, in some embodiments, Figure 5 As shown, a holder 411 is also provided on a side of the radial portion 41 away from the insertion portion 42. Figure 4 and Figure 8 As shown, the holder 411 provides an additional fixing point for the cable 20 after it is led out of the wiring groove 422 of the insertion portion 42 , thereby ensuring that the cable 20 can maintain a stable and orderly layout on one side of the radial portion 41 .

[0045] Therefore, during the operation of the motor, the limit opening 424 or the holder 411 effectively prevents the cable 20 from moving unnecessarily due to external factors such as vibration and impact, ensuring that the cable 20 is neatly laid out and securely fixed, thereby avoiding interference of the movement of the cable 20 with the temperature measurement of the temperature sensor 30 and ensuring the accuracy and stability of the measurement results.

[0046] As can be seen from the above, the insertion portion 42 of the retainer 40 can carry the temperature sensor 30 and be inserted into a specific position in the stator winding 70, so as to measure the temperature of the stator winding 70 during operation. In some embodiments, such as Figures 1 to 3 As shown, the radial portion 41 of the retainer 40 is arranged outside the stator winding 70 in the axial direction, thereby constraining the axial position of the insertion portion 42, that is, limiting the degree of insertion of the insertion portion 42 into the stator winding 70, ensuring that it is always located near the central hot spot. When the motor is running, it is effectively prevented that the insertion portion 42 is excessively penetrated and deviates from the high temperature area of ​​the stator winding 70 due to factors such as vibration and oil flow, thereby ensuring that the temperature sensor 30 can always accurately and effectively capture the real temperature information of the stator winding 70.

[0047] Furthermore, if Figure 5 As shown, the radial portion 41 is provided with a fixing clip 412 on one side close to the insertion portion 42. Figure 8 As shown, the fixing clip 412 is used to buckle on the winding bracket 60 of the stator assembly 200, so as to limit the radial position of the retainer 40 and prevent the retainer 40 from moving in the radial direction. In this way, through the fixing clip 412 of the radial portion 41, even if it encounters various dynamic stresses during the operation of the motor, the retainer 40 can maintain a relatively stable radial position, ensuring that the insertion portion 42 of the retainer 40 will not deviate from the central hot spot area of ​​the stator winding 70 due to radial displacement, maintaining effective contact between the temperature sensor 30 and the hot spot of the stator winding 70, thereby ensuring the accuracy of temperature measurement.

[0048] In some embodiments, Figure 5 As shown, the fixing clip 412 is provided with a fixing surface 413 on a side facing away from the insertion portion 42. Figure 8 As shown, the fixing surface 413 is used to abut against the push pin 81 of the busbar 80 of the stator assembly 200 to limit the axial position of the retainer 40 and prevent the radial portion 41 of the retainer 40 from moving in the axial direction away from the stator winding 70. When the busbar 80 is installed, the push pin 81 of the busbar 80 abuts against the fixing surface 413 of the fixing clip 412, and under the action of the push pin 81 and the stator winding 70, the radial portion 41 of the retainer 40 is firmly fixed, thereby completely positioning and locking the retainer 40 in the axial direction.

[0049] In summary, the fixing clip 412 on the radial portion 41 is snapped onto the winding bracket 60 of the stator assembly 200, thereby limiting the radial position of the retainer 40. At the same time, the push pin 81 of the bus 80 and the stator assembly 200 act together on the radial portion 41, further ensuring the precise axial positioning of the retainer 40. This dual positioning mechanism ensures that during the operation of the motor, regardless of the direction of external force interference, the retainer 40 can maintain its initially set axial and radial positions, thereby ensuring that the temperature sensor 30 can always accurately capture the temperature changes of the central hot spot of the stator winding 70, greatly improving the accuracy and reliability of temperature monitoring.

[0050] In addition, the sensor slot 421 inside the holder 40 and the temperature sensor 30 are in an interference fit, so that the temperature sensor 30 can be firmly fixed in the slot after installation and is not easily dropped due to vibration or impact. At the same time, the wiring slot 422, the limit opening 424 and the holder 411 on the holder 40 effectively snap-fit ​​the cable 20, effectively preventing the cable 20 from separating from the holder 40 under external forces, ensuring a stable connection between the temperature sensor 30 and the cable 20, and further enhancing the stability and reliability of the entire temperature measurement device 100.

[0051] In some embodiments, the temperature sensor 30 is a thermistor, which is divided into a positive temperature coefficient thermistor PTC and a negative temperature coefficient thermistor NTC according to different temperature coefficients. The typical characteristic of thermistors is that they are sensitive to temperature and show different resistance values ​​at different temperatures. The positive temperature coefficient thermistor PTC has a greater resistance value when the temperature is higher, and the negative temperature coefficient thermistor NTC has a lower resistance value when the temperature is higher. They are both semiconductor devices. In this embodiment, it is a negative temperature coefficient thermistor NTC.

[0052] Based on the same inventive concept, the present disclosure provides a stator assembly 200. The specific manner of implementing the functions of the stator assembly 200 in the above embodiment has been described in detail in the embodiment of the temperature measurement device 100, and will not be elaborated here.

[0053] It is further understood that, although the operations are described in a specific order in the drawings in the embodiments of the present disclosure, it should not be understood as requiring the operations to be performed in the specific order shown or in a serial order, or requiring the execution of all the operations shown to obtain the desired results. In certain environments, multitasking and parallel processing may be advantageous.

[0054] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the utility model disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the following scope of rights.

[0055] It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the scope of the appended claims.

Claims

1. A temperature measuring device (100), characterized in that: Applied to a stator assembly, the temperature measuring device (100) comprises: a temperature sensor (30); and Cage (40), The retaining frame (40) is provided with an axially extending insertion portion (42), the temperature sensor (30) is fixed to the insertion portion (42), and the insertion portion (42) carries the temperature sensor (30) and is inserted between the stator windings (70) of two adjacent stator assemblies (200) for measuring the temperature of the stator windings (70) during operation.

2. The temperature measuring device (100) according to claim 1, characterized in that: A sensor groove (421) is provided in the head end of the insertion portion (42), and the inner contour of the sensor groove (421) matches the outer contour of the temperature sensor (30) so as to clamp and fix the temperature sensor (30).

3. The temperature measuring device (100) according to claim 2, characterized in that: The thickness of the insertion portion (42) at the head end is greater than the spacing between two adjacent stator windings (70), so as to enable the insertion portion (42) to be interference-fitted with the two adjacent stator windings (70) and to enable the temperature sensor (30) to fit tightly with the stator winding (70).

4. The temperature measuring device (100) according to claim 2, characterized in that: The temperature measuring device (100) further comprises a cable (20), wherein the cable (20) is electrically connected to the temperature sensor (30), wherein a wiring groove (422) is further provided in the insertion portion (42), wherein the wiring groove (422) is communicated with the sensor groove (421) and is used to fix the cable (20) located in the insertion portion (42).

5. The temperature measuring device (100) according to claim 4, characterized in that: The retaining frame (40) is The retainer (40) further comprises a radial portion (41) extending radially. A limiting opening (424) is provided at the connection between the insertion portion (42) and the radial portion (41), and the limiting opening (424) allows the cable (20) to pass through a side of the radial portion (41) away from the insertion portion (42) and enter the wiring groove (422), thereby securing the cable (20).

6. The temperature measuring device (100) according to claim 5, characterized in that: The radial portion (41) is provided with a clamping seat (411), and the clamping seat (411) is located on a side of the radial portion (41) away from the insertion portion (42), and is used to fix the cable (20).

7. The temperature measuring device (100) according to claim 5, characterized in that: The radial portion (41) is provided with a fixing clip (412) on a side surface close to the insertion portion (42); the fixing clip (412) is used to be clamped on the winding bracket (60) of the stator assembly (200) to limit the radial position of the retaining frame (40).

8. The temperature measuring device (100) according to claim 7, characterized in that: The fixing clamp (412) is provided with a fixing surface (413) on a side facing away from the insertion portion (42), and the fixing surface (413) is used to abut against a push pin (81) of the busbar (500) of the stator assembly (200) to limit the axial position of the retaining frame (40).

9. The temperature measuring device (100) according to claim 2, characterized in that: The outside of the head end is provided with a chamfer (423).

10. The temperature measuring device (100) according to claim 4, characterized in that: The temperature measurement device (100) further comprises a connector (10), wherein the connector (10) is electrically connected to the temperature sensor (30) via the cable (20).

11. The temperature measuring device (100) according to claim 1, characterized in that: The temperature sensor (30) is a negative temperature coefficient thermistor.

12. A stator assembly (200), characterized in that: include: A stator core (50), wherein the inner circumference of the stator core (50) is provided with a plurality of circumferentially spaced stator teeth (51); A stator winding (70) wound and fixed on the stator teeth (51); The temperature measuring device (100) according to any one of claims 1 to 11, wherein the temperature measuring device (100) is used to measure the temperature of the stator winding (70) during operation.

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