Temperature measurement sensor for stator winding
By incorporating a housing and temperature-sensing element into the stator winding temperature sensor, optimizing cable layout, and using high-temperature resistant materials and protective measures, the problems of high cable cost and signal distortion in existing temperature sensors have been solved, achieving higher temperature measurement accuracy and reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-23
- Publication Date
- 2026-03-03
AI Technical Summary
Existing temperature sensors require long cables, which leads to high cable costs and makes them prone to signal distortion and malfunctions, affecting the accuracy of temperature measurement.
Design a stator winding temperature sensor, which uses multiple temperature sensing elements installed inside the housing. The cable extends perpendicularly to the first side of the housing, with the extension position being 4/5 of the distance from the first end. The temperature sensing elements sense the temperature and transmit the signal through the cable. The cable extends from a specific position on the longest side of the housing to reduce its length. The housing is protected by phenolic resin laminate and alkyd high-resistivity insulating varnish. The cable uses high-temperature resistant silicone wire and is protected by heat shrinking. The temperature sensing elements are ceramic platinum resistance elements.
It reduces cable length, lowers cable costs, avoids signal distortion and malfunctions, and improves the accuracy and reliability of temperature measurement.
Smart Images
Figure CN223966170U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of temperature sensor technology, and in particular to a stator winding temperature sensor. Background Technology
[0002] A resistance temperature detector (RTD) is a type of temperature sensor that measures temperature by utilizing the property that the resistance of a metal conductor changes with temperature. For iron core temperature measurement, it can accurately measure the temperature of the iron core, which is crucial for monitoring the operation of electrical equipment.
[0003] Specific parts of the stator of large generator sets, such as the coil layers, stator core, and finger pressure plate, are usually designed and equipped with a certain number of temperature sensors to monitor temperature changes in these parts, thereby achieving the purpose of monitoring whether the entire unit is in a normal and reliable operating state.
[0004] like Figure 4 As shown, existing temperature sensors typically have cables extending from one end of the sensor. Due to limited space within the stator windings, the connection between the sensor and cable cannot be bent arbitrarily. The cable needs to connect to the terminal box and can only exit from the end that bypasses the stator windings. Longer windings exceed 3 meters in length, requiring even longer cables to pass through them. This not only increases cable costs but also necessitates more adapters. Longer cables and more adapters can easily lead to signal distortion, inaccurate temperature measurements, and increased susceptibility to malfunctions during operation. Therefore, improvements to existing temperature sensors are necessary. Utility Model Content
[0005] The main purpose of this application is to propose a stator winding temperature sensor, which aims to solve the problem that existing temperature sensors require long cables, resulting in high cable costs.
[0006] To achieve the above objectives, the stator winding temperature sensor proposed in this application includes: a housing, a plurality of temperature sensing elements disposed inside the housing, wires connecting the plurality of temperature sensing elements to a cable, the cable extending perpendicularly to a first side of the housing, the first side being the longest side of the housing;
[0007] The distance from the point where the cable extends to the first end of the housing is equal to 4 / 5 of the distance from the first side.
[0008] Optionally, the outer casing includes a housing and a cover. A receiving groove is provided on the housing corresponding to the temperature sensing element. The temperature sensing element is installed in the receiving groove. The cover is disposed outside the receiving groove. The cover and the housing are connected by adhesive sealing.
[0009] Optionally, the outer shell is a rectangular structure made of phenolic resin laminate.
[0010] Optionally, the outer side of the housing is provided with an alkyd-type high-resistivity insulating varnish.
[0011] Optionally, the cable is a high-temperature resistant silicone wire.
[0012] Optionally, a silicone heat shrink tubing is fitted around the connection between the cable and the wire of the temperature sensing element.
[0013] Optionally, two temperature sensing elements are provided.
[0014] Optionally, the temperature sensing element is a ceramic platinum resistance element.
[0015] Optionally, one of the temperature sensing elements is located near the first end inside the housing, and the other temperature sensing element is located near the second end inside the housing, with the cable extending out between the two temperature sensing elements.
[0016] Optionally, the two temperature sensing elements are arranged side by side near the first end inside the housing.
[0017] This application's technical solution involves setting up an outer casing with multiple temperature-sensing elements inside. The wires connecting these elements are cabled, extending perpendicularly from the first side of the casing, which is the longest side. The distance from the cable's extension point to the first end of the casing is equal to 4 / 5 of the length of the first side. The temperature-sensing elements detect the stator winding temperature and convert the temperature signal into an electrical signal. The wires transmit this electrical signal via cable to an external measuring device (such as a temperature acquisition module). The cable extends from a specific position on the longest side of the casing (4 / 5 of the distance from the first end), allowing it to pass through the ventilation slot in the middle of the stator core and connect to the terminal box. This design facilitates the placement of temperature measurement points, reduces cable length, avoids signal distortion caused by poor contact at the adapters, thus preventing inaccurate temperature measurements and reducing the likelihood of malfunctions, resulting in higher measurement accuracy. Attached Figure Description
[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0019] Figure 1 This is a schematic diagram of the structure of the first embodiment of the stator winding temperature sensor of this application;
[0020] Figure 2 This is a schematic diagram of the structure of the second embodiment of the stator winding temperature sensor of this application;
[0021] Figure 3 This is a schematic diagram showing the state of the stator winding temperature sensor installed on the stator winding in this application;
[0022] Figure 4 This is a schematic diagram of the state in which the temperature sensor is installed on the stator winding in the prior art.
[0023] Explanation of icon numbers:
[0024] 1. Housing; 2. Temperature sensing element; 201. Wire; 3. Cable; 4. Heat shrink tubing; 5. Iron core; 501. Ventilation slot; 6. Terminal box.
[0025] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.
[0027] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.
[0028] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0029] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.
[0030] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.
[0031] like Figure 4 As shown, existing temperature sensors typically have cables extending from one end of the sensor. Due to limited space within the stator windings, the connection between the sensor and cable cannot be bent arbitrarily. The cable needs to connect to the terminal box and can only exit from the end that bypasses the stator windings. Longer windings exceed 3 meters in length, requiring even longer cables to pass through them. This not only increases cable costs but also necessitates more adapters. Longer cables and more adapters can easily lead to signal distortion, inaccurate temperature measurements, and increased susceptibility to malfunctions during operation. Therefore, improvements to existing temperature sensors are necessary.
[0032] In view of this, this application proposes a stator winding temperature sensor.
[0033] In the embodiments of this application, reference is made to Figures 1 to 3The aforementioned stator winding temperature sensor includes: a housing 1, with multiple temperature sensing elements 2 disposed inside the housing 1, and wires 201 of the multiple temperature sensing elements 2 connected to cables 3. The cables 3 extend perpendicularly to a first side of the housing 1, which is the longest side of the housing 1. The distance from the point where the cables 3 extend to the first end of the housing 1 is equal to 4 / 5 of the distance of the first side. The temperature sensing elements 2 sense the temperature of the stator winding and convert the temperature signal into an electrical signal. The wires transmit the electrical signal to an external measuring device (such as a temperature acquisition module) through the cables 3. The cables 3 extend from a specific position on the longest side of the housing 1 (4 / 5 of the distance from the first end), allowing the cables 3 to pass through the ventilation slot 501 in the middle of the stator core 5 and connect to the terminal box 6. The housing 1 protects the temperature sensing elements 2 from mechanical damage and electromagnetic interference. The optimized position of the cables 3 (4 / 5 of the distance) makes the sensor more compatible with the spatial layout of the winding slots.
[0034] In this embodiment, the outer shell 1 includes a shell and a cover. A receiving groove is provided on the shell corresponding to the temperature sensing element 2. The temperature sensing element 2 is installed in the receiving groove. The cover is provided on the outside of the receiving groove. The cover and the shell are connected by adhesive sealing. The temperature sensing element 2 is installed in the receiving groove of the shell. The cover is fixed by adhesive sealing to form a closed cavity, which prevents external impurities from entering and plays a role in protecting the temperature sensing element 2 and ensuring long-term stable operation.
[0035] In this embodiment, reference Figure 1 The outer shell 1 is a long rectangular structure made of phenolic resin laminate. Phenolic resin has high insulation strength (breakdown voltage ≥15kV / mm), high temperature resistance (long-term working temperature ≤130℃) and high mechanical strength (bending strength ≥100MPa), making it suitable for the high temperature and high pressure environment inside the motor. The long strip structure fits the narrow space of the stator winding slot, increasing the contact area with the winding and improving the temperature measurement sensitivity.
[0036] In this embodiment, an alkyd high-resistance insulating varnish is provided on the outer side of the housing 1. The alkyd high-resistance insulating varnish is coated on the surface of the housing 1 to form an insulating protective layer, reducing the risk of leakage between the housing 1 and the winding. It can effectively reduce the discharge damage of high voltage to the main insulation of the stator coil, improve the reliability of the temperature sensor, slow down the aging of the housing 1, extend the life of the sensor, and reduce maintenance costs.
[0037] In this embodiment, cable 3 is a high-temperature resistant silicone wire; the silicone wire has a temperature range of -60℃ to 200℃, an insulation resistance of ≥10^11Ω·cm, and is flexible and easy to bend, making it suitable for wiring in confined spaces; the low-impedance wire reduces signal transmission loss and ensures temperature measurement accuracy.
[0038] In this embodiment, a silicone heat shrink tubing 4 is fitted on the outside of the connection between the cable 3 and the wire of the temperature sensing element 2; after heating, the silicone heat shrink tubing 4 shrinks and tightly wraps the joint, forming a mechanical protection and electrical insulation layer; the heat shrink tubing 4 can absorb the stress generated by the vibration of the wire, prevent the solder joint or crimp joint from breaking, completely wrap the joint, prevent moisture and oil from penetrating, and avoid the joint from oxidizing.
[0039] In this embodiment, reference Figure 1 There are two temperature sensing elements 2; the two temperature sensing elements 2 can simultaneously measure the temperature of the same area or different areas of the stator winding, and the signal is transmitted to the external device through the same cable 3; the two elements can serve as backups for each other, and if one element fails, the other element can still work, improving the reliability of the system. The two elements provide richer temperature distribution information, which is superior to single-point measurement of a single element.
[0040] In this embodiment, the temperature sensing element 2 is a ceramic platinum resistance element; the ceramic encapsulation protects the platinum resistance wire, preventing mechanical damage and chemical corrosion, ensuring resistance stability, and measuring range of -200℃ to 650℃, which is suitable for the normal operating temperature of the motor stator. In addition, the ceramic encapsulation is vibration-resistant and shock-resistant, making it suitable for the harsh working conditions of high-speed motor rotation.
[0041] In the first embodiment of this application, reference is made to Figure 1 One of the temperature sensing elements 2 is located near the first end inside the outer casing 1, and the other temperature sensing element 2 is located near the second end inside the outer casing 1. The cable 3 extends out from the middle of the two temperature sensing elements 2. By comparing the temperature difference between the two elements, it can be determined whether there is local overheating in the winding, and the winding temperature gradient can be monitored to locate the hot spot area.
[0042] In the second embodiment of this application, reference is made to Figure 2 Two temperature sensing elements 2 are arranged side by side near the first end inside the outer casing 1. Compared with the first embodiment, the two temperature sensing elements 2 are relatively close to each other, so as to serve as backups for each other. If one element fails, the temperature point measured by the other element is closest to the original temperature measuring point, so as to accurately monitor the object being measured.
[0043] refer to Figure 3 The temperature sensor is installed at the designated temperature measurement position on the winding, and the cable 3 passes through the ventilation slot 501 of the iron core 5 and is finally connected to the terminal box 6.
[0044] This application's technical solution involves setting up an outer casing with multiple temperature-sensing elements inside. The wires connecting these elements are cabled, extending perpendicularly from the first side of the casing, which is the longest side. The distance from the cable's extension point to the first end of the casing is equal to 4 / 5 of the length of the first side. The temperature-sensing elements detect the stator winding temperature and convert the temperature signal into an electrical signal. The wires transmit this electrical signal via cable to an external measuring device (such as a temperature acquisition module). The cable extends from a specific position on the longest side of the casing (4 / 5 of the distance from the first end), allowing it to pass through the ventilation slot in the middle of the stator core and connect to the terminal box. This design facilitates the placement of temperature measurement points, reduces cable length, avoids signal distortion caused by poor contact at the adapters, thus preventing inaccurate temperature measurements and reducing the likelihood of malfunctions, resulting in higher measurement accuracy.
[0045] The above description is merely an optional embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the inventive concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.
Claims
1. A stator winding temperature measurement sensor, characterized by, The utility model relates to a temperature sensor, comprising: a housing, a plurality of temperature sensing elements are arranged in the housing, a plurality of the temperature sensing elements are connected by a wire cable, the cable extends out of a first side of the housing, and the first side is the longest side of the housing; the distance from the position where the cable extends out to the first end of the housing is equal to 4 / 5 of the length of the first side.
2. The stator winding temperature measurement sensor of claim 1, wherein, The housing comprises a shell and a cover, the shell is provided with a receiving groove corresponding to the temperature sensing element, the temperature sensing element is installed in the receiving groove, and the cover is arranged outside the receiving groove.
3. The stator winding temperature measurement sensor of claim 1, wherein, The housing is a long square structure made of phenolic resin laminated board.
4. The stator winding temperature measurement sensor of claim 3, wherein, An alcohol acid type high-resistance insulating paint is arranged on the outer side of the housing.
5. The stator winding temperature measurement sensor of claim 1, wherein, The cable is a high-temperature resistant silica gel wire.
6. The stator winding temperature measurement sensor of claim 1, wherein, A silica gel heat shrink tube is arranged outside the connection between the cable and the wire of the temperature sensing element.
7. The stator winding temperature measurement sensor of claim 1, wherein, The temperature sensing element is provided with two.
8. The stator winding temperature measurement sensor of claim 7, wherein, The temperature sensing element is a ceramic platinum resistance element.
9. The stator winding temperature measurement sensor of claim 7, wherein, One of the temperature sensing elements is arranged near the first end in the housing, and the other temperature sensing element is arranged near the second end in the housing.
10. The stator winding temperature measurement sensor of claim 7 wherein, The two temperature sensing elements are arranged side by side near the first end in the housing.