Device and method for measuring heat conductivity coefficient of motor bar based on infrared temperature imaging

Abstract

The invention relates to the technical field of heat conductivity coefficient measurement, and discloses a motor bar heat conductivity coefficient measurement device and method based on infrared temperature imaging. Comprising a support, supporting legs, a lower groove plate, a wire groove, a transmission belt, rollers, an upper groove plate, a transmission belt, a wire clamp, a transmission wheel, a motor shaft extension end, a wire end, an alternating-current low-speed motor, a protruding connector, a fixing bolt, a pulley block, a carrying platform, a fixing bolt, a pulley, a hole, a transmission wheel, a rolling bearing, a VIDEO interface, an I / O interface, an LENS interface, a DC 12V interface, a power indicator lamp, a network connection port and an infrared thermal imaging device. And an infrared detector. According to the invention, 360-degree omnibearing measurement of the temperature and the temperature change of the winding bar in a high-voltage motor test experiment is satisfied, and the heat conduction coefficient of the winding bar is calculated, and meanwhile, the heat conduction performance of different positions of the winding bar can be represented.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thermal conductivity measurement, in particular to a motor wire bar thermal conductivity measurement device and method based on infrared temperature imaging. BACKGROUND

[0002] When the motor is running, the motor stator part has a certain resistance, which will heat up when powered on, causing the temperature of the motor wire bar to rise, thereby affecting the motor running stability and insulation performance. Thermal conductivity is an important physical quantity to measure the heat conduction capacity of materials. Current thermal conductivity measurement mainly uses steady-state method and transient method.

[0003] In the steady-state method, the sample is first heated by a heat source to make the heating and heat dissipation process reach a balanced state, forming a stable temperature field inside the sample. According to the temperature gradient and heat transfer rate per unit area at this time, and combining Fourier's law, the thermal conductivity of the measured material can be calculated. In the transient method, the temperature distribution in the sample is a non-steady temperature field that changes with time. By monitoring the temperature change rate of the sample surface, the thermal diffusivity of the sample can be determined, and the thermal conductivity of the sample can be obtained.

[0004] In practical applications, the above two methods can only determine the thermal conductivity of the motor outer insulation material and the thermal conductivity of the motor wire bar winding. The comprehensive thermal conductivity of the motor wire bar winding and the motor insulation material cannot be well represented. At the same time, in practical applications, the thickness of the outer insulation layer of different parts of the motor wire bar is different, which will also cause the thermal conductivity of different parts to be different.

[0005] Therefore, in view of the above problems, a motor wire bar thermal conductivity measurement device and method based on infrared temperature imaging are needed. SUMMARY

[0006] The present application relates to the technical field of thermal conductivity measurement, in particular to a motor wire bar thermal conductivity measurement device and method based on infrared temperature imaging.

[0007] The present application is implemented as follows:

[0008] The application provides a motor wire rod heat conductivity coefficient measuring device based on infrared temperature imaging.

[0009] Further, the support feet are fixed with brackets through fastening bolts, the brackets are two, the included angles between the two brackets and the horizontal ground are both 60 degrees, the support feet are horizontal to the ground, and the included angle between the two brackets is 60 degrees.

[0010] The lower groove plate is arranged on the bracket and fixed through a fastening bolt, the wire groove is arranged behind the lower groove plate, the wire groove is arranged on the lower groove plate, the upper groove plate is arranged on the lower groove plate and fixed through a bolt, the upper groove plate and the lower groove plate are fixed with the low-speed alternating current motor through a locking screw, the transmission shaft of the low-speed alternating current motor is provided with a transmission wheel, the center positions of the low-speed alternating current motor and the transmission wheel are the same, the upper groove plate and the lower groove plate are provided with rolling bearings at the other end opposite to the low-speed alternating current motor, the rolling bearings are provided with transmission wheels, two groups of pulley blocks are arranged at the two ends of the wire groove, each group of pulley blocks is provided with two groups of pulleys arranged above and below and left and right, the pulley blocks arranged left and right are symmetrically distributed according to the central axis of the object carrying platform, and the pulley blocks arranged above and below are symmetrically distributed.

[0011] The transmission wheel and the rolling bearing are fixedly connected on the upper groove plate and the lower groove plate through fastening bolts, the center positions of the transmission wheel and the rolling bearing are the same, the transmission wheel and the transmission wheel have the same inner diameter and are provided with wheel grooves, the transmission belt is arranged in the wheel grooves of the transmission wheel and the transmission wheel, and the transmission is achieved through friction; the transmission belt passes through the pulley blocks arranged above and below the pulleys, and the distance between the pulleys is smaller than the outer diameter of the rollers.

[0012] Further, the object carrying platform is fixed on the upper groove plate and provided with pulleys through fastening bolts, the hole is arranged at the center position of the upper groove plate, and the infrared imaging device is arranged on the object carrying platform and fixed through a bolt. The protruding block is arranged on the object carrying platform, the protruding block is fixed with the measuring instrument through a bolt. The infrared thermal imaging device is fixed on the object carrying platform through a fixing bolt and moves with the object carrying platform. The infrared imaging device is a five lens optical MAG32 infrared thermal imager.

[0013] The transmission wheel is same in diameter with the outer diameter of the transmission wheel, the transmission belt is taut on the transmission wheel and the transmission wheel, the transmission belt is located outside the upper groove plate, the length of the transmission belt is matched with the circumferential length of the upper groove plate and the groove depth of the transmission wheel and the transmission wheel, so that the transmission belt is tensioned.

[0014] Further, the back side of the infrared thermal imaging device is adjacent to a VIDEO interface, an I / O interface, a LENS interface, a DC 12V interface and a power indicator light, the VIDEO interface is used for image data transmission, the I / O interface is used for data exchange with a host, the LENS interface is used for debugging of an infrared thermal imaging lens, the DC 12V interface is used for power connection, and the power indicator light is used for observing power-on condition, and the network connection port is used for network connection.

[0015] Further, the present application provides an infrared temperature imaging-based motor wire rod thermal conductivity coefficient measurement method, which is specifically executed according to the following steps:

[0016] S1: The data collected by the infrared thermal imaging device is calculated according to the Planck radiation law to obtain the energy distribution data of a black body at different temperatures, and the formula is as follows:

[0017]

[0018] Wherein, M(λ, T) is the spectral radiance of a black body with wavelength λ and temperature T; h is the Planck constant; c is the speed of light; and k is the Boltzmann constant.

[0019] S2: The temperature of the measuring wire rod is calculated, and the formula is as follows:

[0020] M(T) = σT 4

[0021] Wherein, M(T) is the total radiance of a black body with temperature T; and σ is the Stefan-Boltzmann constant.

[0022] S3: After the temperature of the measuring wire rod is calculated, the temperatures of different parts are calculated, and the thermal conductivity coefficient is further calculated; the heat flow through the material is measured, and then the thermal conductivity coefficient is calculated; and the formula is as follows:

[0023]

[0024] Wherein, k is the thermal conductivity coefficient; Q is the heat flow; L is the sample thickness; A is the sample cross-sectional area; and T2-T1 is the temperature difference between the two sides of the sample.

[0025] Further, the present application provides a computer storage medium, wherein the storage medium stores a computer program, and when the computer program in the storage medium runs, the above-mentioned infrared temperature imaging-based motor wire rod thermal conductivity coefficient measurement method is executed.

[0026] Compared with the prior art, the present application has the following advantages:

[0027] 1、The present application can obtain the specific value of the thermal conductivity of the line bar at different positions, meet the 360° omnibearing measurement of the line bar temperature and temperature change in the high-voltage motor test experiment, and calculate the thermal conductivity of the line bar, and also can characterize the thermal conductivity performance of the line bar at different positions

[0028] 2、Meanwhile, the frame composed of the support, the supporting leg, the lower groove plate and the upper groove plate can effectively support the stability of the whole device, the load platform is driven to perform the circular motion by the transmission belt of the alternating low-speed motor, and most of the components are connected by the fastening bolts, which is convenient for disassembly and assembly. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments, and understand that the following drawings only show some embodiments of the present application, and should not be regarded as limiting the scope, and for the ordinary skilled in the art, other related drawings can also be obtained according to these drawings without creative labor.

[0030] Figure 1 is the overall device diagram of the present application;

[0031] Figure 2 is the partial structure diagram of the present application;

[0032] Figure 3 is the partial structure diagram of the present application;

[0033] Figure 4 is the partial structure diagram of the present application;

[0034] In the figure, 1 is a support, 2 is a supporting leg, 3 is a lower groove plate, 4 is a wire slot, 5 is a transmission belt, 6 is a roller, 7 is an upper groove plate, 8 is a transmission belt, 9 is a wire clamp, 10 is a transmission wheel, 11 is a motor shaft extension end, 12 is a wire end, 13 is an alternating low-speed motor, 14 is a convex connection, 15 is a fixing bolt, 16 is a pulley, 17 is a load platform, 18 is a fixing bolt, 19 is a pulley, 20 is a hole, 21 is a transmission wheel, 22 is a rolling bearing, 23 is a VIDEO interface, 24 is an IO interface, 25 is a LENS interface, 26 is a DC 12 interface, 27 is a power indicator light, 28 is a network connection port, 29 is an infrared thermal imaging device, 30 is an infrared detector. DETAILED DESCRIPTION

[0035] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only for selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0036] Referring to Figures 1-4 The present application provides an infrared temperature imaging-based motor wire bar thermal conductivity coefficient measuring device,

[0037] The present application provides an infrared temperature imaging-based motor wire bar thermal conductivity coefficient measuring device. It comprises a support 1, a supporting leg 2, a lower groove plate 3, a wire groove 4, a transmission belt 5, a roller 6, an upper groove plate 7, a transmission belt 8, a wire clamp 9, a transmission wheel 10, a motor shaft extension end 11, a wire end 12, an alternating current low-speed motor 13, a protruding connection 14, a fixing bolt 15, a pulley block 16, a load platform 17, a fixing bolt 18, a pulley 19, a hole 20, a transmission wheel 21, a rolling bearing 22, a VIDEO interface 23, an I / O interface 24, a LENS interface 25, a DC 12V interface 26, a power indicator light 27, a network connection port 28, an infrared thermal imaging device 29, and an infrared detector 30.

[0038] In the present embodiment, the support 1 is fixed on the supporting leg 2 by a fastening bolt,

[0039] The support 1 is two, and the included angle between the two supports and the horizontal ground is 60°. The supporting leg 2 is horizontal to the ground, and the included angle between the two supports 1 is 60°.

[0040] The lower groove plate 3 is fixed on the bracket 1 by fastening bolts; the wire slot 4 is located behind the lower groove plate 3, the wire slot 4 is opened on the lower groove plate 3, the upper groove plate 7 is fixed on the lower groove plate 3 by bolts, the alternating current low-speed motor 13 is fixed on the upper groove plate 7 and the lower groove plate 3 by a fastening screw, the transmission wheel (10) is arranged on the transmission shaft of the alternating current low-speed motor 13, the center position of the alternating current low-speed motor 13 and the transmission wheel (10) is the same, the rolling bearing 22 is arranged on the other end of the upper groove plate 7 and the lower groove plate 3 opposite to the low-speed motor 13, the transmission wheel 21 is arranged on the rolling bearing 22, two groups of pulley blocks 16 are arranged at both ends of the wire slot 4, the pulley blocks 16 have two groups of pulleys in up and down and left and right, the pulley blocks on the left and right sides are symmetrically distributed according to the axis in the load platform 17, and the pulley blocks on the upper side and the lower side are symmetrically opposite to each other.

[0041] The transmission wheel 21 and the rolling bearing 22 are fixedly connected on the upper groove plate 7 and the lower groove plate 3 by fastening bolts, the center positions of the transmission wheel 21 and the rolling bearing 22 are the same; the transmission wheel 10 and the transmission wheel 21 have the same inner diameter size and are provided with wheel grooves, the transmission belt 8 is arranged in the wheel grooves of the transmission wheel 10 and the transmission wheel 21 and transmits power through friction; the transmission belt 5 passes through between the upper and lower pulley blocks of the pulley 19, and the distance between the pulleys 19 is smaller than the outer diameter of the roller 6.

[0042] In the embodiment, the load platform 17 is fixed on the upper groove plate 7, the pulley 19 is arranged on the load platform 17 by fastening bolts; the hole 20 is opened at the center position of the upper groove plate 7, and the infrared imaging device 29 is fixed on the load platform 17 by bolts. The protruding block 14 is arranged on the load platform 17, and the measuring instrument is fixed on the protruding block 14 by bolts. The infrared thermal imaging device 29 is fixed on the load platform 14 by fastening bolts and moves with the load platform 14. The infrared imaging device is a five ling optical MAG32 infrared thermal imager. After the connecting lines of the infrared thermal imaging device 29 are connected, the motor wire rod to be measured can be scanned at 360°, so that the temperature distribution diagram of the motor wire rod to be measured at different positions is obtained, and then the thermal conductivity coefficients of different parts are calculated by using calculation software.

[0043] The transmission wheel 10 and the transmission wheel 21 have the same outer diameter, the transmission belt 8 is taut on the transmission wheel 10 and the transmission wheel 21, the transmission belt 8 is located outside the upper groove plate 7, the length of the transmission belt 8 matches the circumferential length of the upper groove plate 7 and the depth of the wheel groove of the transmission wheel 10 and the transmission wheel 21, so that the transmission belt 8 is tensioned.

[0044] In this embodiment, the back side end of the infrared thermal imaging device 29 is adjacent to a VIDEO interface 23, an I / O interface 24, a LENS interface 25, a DC 12V interface 26 and a power indicator lamp 27, the VIDEO interface 23 is used for image data transmission, the I / O interface 24 is used for data exchange with the host, the LENS interface 25 is used for debugging the infrared thermal imaging lens, the DC 12V interface 26 is used for connecting the power supply, the power indicator lamp 27 is used for observing the power-on condition, and the network connection port 28 is used for connecting the network.

[0045] In this embodiment, the present application provides an infrared temperature imaging-based motor wire rod thermal conductivity measurement method, which is specifically executed according to the following steps:

[0046] S1: The data collected by the infrared thermal imaging device is calculated according to the Planck radiation law to obtain the energy distribution data of the black body at different temperatures, and the formula is as follows:

[0047]

[0048] Wherein, M(λ, T) is the spectral radiance of the black body with wavelength λ and temperature T; h is the Planck constant; c is the speed of light; k is the Boltzmann constant;

[0049] S2: Calculate the temperature of the measuring wire rod, as follows:

[0050] M(T)=σT 4

[0051] Wherein, M(T) is the total radiation of the black body with temperature T; σ is the Stefan-Boltzmann constant;

[0052] S3: After calculating the temperature of the measuring wire rod, the temperatures of different parts are calculated, and the thermal conductivity is further calculated; the heat flow through the material is measured, and then the thermal conductivity is calculated; as follows:

[0053]

[0054] Wherein, k is the thermal conductivity; Q is the heat flow; L is the sample thickness; A is the sample cross-sectional area, and T2-T1 is the temperature difference between the two sides of the sample.

[0055] In this embodiment, the present application provides a computer storage medium, the storage medium stores a computer program, when the computer program in the storage medium runs, the above-mentioned infrared temperature imaging-based motor wire rod thermal conductivity measurement method is executed.

[0056] The above merely describes the preferred embodiments of the present application and is not used to limit the present application. Various modifications and changes can be made by those skilled in the art to the present application without departing from the spirit and principle of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A device for measuring the thermal conductivity of motor rods based on infrared temperature imaging, characterized in that: The system includes a support foot (2), a bracket (1) fixed to the support foot (2) by fastening bolts, a lower groove plate (3) fixed to the bracket (1) by fastening bolts; a wire groove (4) is formed on the lower groove plate (3), an upper groove plate (7) is fixed to the lower groove plate (3) by bolts, an AC low-speed motor (13) is fixed to the upper groove plate (7) and the lower groove plate (3) by set screws, a transmission wheel (10) is provided on the transmission shaft of the AC low-speed motor (13), and a rolling shaft is provided on the upper groove plate (7) and the lower groove plate (3) at the opposite end to where the low-speed motor (13) is located. The rolling bearing (22) is provided with a transmission wheel (21), and two sets of pulleys (16) are provided at both ends of the groove (4); the transmission wheel (10) and the transmission wheel (21) have the same inner diameter and both have wheel grooves. A transmission belt (8) is provided in the wheel grooves of the transmission wheel (10) and the transmission wheel (21). A loading platform (17) is fixed on the upper groove plate (7), and a pulley (19) is provided on the loading platform (17) by fastening bolts; a hole (20) is opened at the center of the upper groove plate (7), and an infrared imaging device (29) is fixed on the loading platform (17) by bolts.

2. The device for measuring the thermal conductivity of motor rods based on infrared temperature imaging according to claim 1, characterized in that: The bracket (1) consists of two supports, each with an angle of 60° to the horizontal ground. The support leg (2) is horizontal to the ground, and the angle between the two supports (1) is 60°.

3. The device for measuring the thermal conductivity of motor rods based on infrared temperature imaging according to claim 2, characterized in that: The outer diameter of the drive wheel (10) and the drive wheel (21) is the same. The drive belt (8) is taut on the drive wheel (10) and the drive wheel (21). The drive belt (8) is located outside the upper groove plate (7). Its length matches the circumference of the upper groove plate (7) and the groove depth of the drive wheel (10) and the drive wheel (21), so that the drive belt (8) is taut.

4. The device for measuring the thermal conductivity of motor rods based on infrared temperature imaging according to claim 1, characterized in that: The transmission belt (5) passes between the upper and lower pulley groups of the pulleys (19), and the distance between the pulleys (19) is less than the outer diameter of the roller (6).

5. The device for measuring the thermal conductivity of motor rods based on infrared temperature imaging according to claim 1, characterized in that: A protrusion (14) is provided on the loading platform (17), and the protrusion (14) is used to fix the measuring instrument by bolts.

6. The device for measuring the thermal conductivity of motor rods based on infrared temperature imaging according to claim 1, characterized in that: The pulley block (16) has two sets of pulleys on the top and bottom and two sets on the left and right. The pulley blocks on the left and right sides are symmetrically distributed according to the central axis of the loading platform (17), and the pulley blocks on the top and bottom sides are symmetrical to each other.

7. The device for measuring the thermal conductivity of motor rods based on infrared temperature imaging according to claim 1, characterized in that: The infrared thermal imaging device (29) has a VIDEO interface (23), an I / O interface (24), a LENS interface (25), a DC 12V interface (26), and a power indicator (27) adjacent to each other on its back side. The VIDEO interface (23) is used for image data transmission, the I / O interface (24) is used for data exchange with the host, the LENS interface (25) is used for debugging the infrared thermal imaging lens, the DC 12V interface (26) is used to turn on the power, the power indicator (27) is used to observe the power-on status, and the network connection port (28) is used to connect to the network.

8. The device for measuring the thermal conductivity of motor rods based on infrared temperature imaging according to claim 1, characterized in that: The infrared thermal imaging device (29) is fixed to the loading platform (14) by fixing bolts and moves with the loading platform (14).

9. A method for measuring the thermal conductivity of motor rods based on infrared temperature imaging, characterized in that: Follow these steps: S1: Data collected by an infrared thermal imaging device is used to calculate the energy distribution of blackbody radiation at different temperatures using Planck's radiation law, as shown in the following formula: Where M(λ,T) is the spectral radiative exertimetry of a blackbody with wavelength λ and temperature T; h is Planck's constant; c is the speed of light; and k is Boltzmann's constant. S2: Calculate the temperature of the measuring rod as follows: M(T)=σT 4 Where M(T) is the total radiative output radiance of a blackbody at temperature T; σ is the Stefan-Boltzmann constant; S3: After calculating the temperature of the measuring rod, calculate the temperature of different parts, and then calculate the thermal conductivity; measure the heat flow through the material, and then calculate the thermal conductivity; as shown in the following formula: Where k is the thermal conductivity; Q is the heat flow rate; L is the sample thickness; A is the sample cross-sectional area; and T2-T1 is the temperature difference between the two sides of the sample.

10. A computer-storable medium, characterized in that: The storage medium stores a computer program. When the computer program in the storage medium runs, it executes the method for measuring the thermal conductivity of motor rods based on infrared temperature imaging as described in claim 9.

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