CN113433407A - Method and device for temperature rise test of suspension electromagnet - Google Patents
Method and device for temperature rise test of suspension electromagnet Download PDFInfo
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- CN113433407A CN113433407A CN202110694334.3A CN202110694334A CN113433407A CN 113433407 A CN113433407 A CN 113433407A CN 202110694334 A CN202110694334 A CN 202110694334A CN 113433407 A CN113433407 A CN 113433407A
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Abstract
The method comprises the steps of obtaining internal resistance of a magnetic pole and internal temperature of the magnetic pole in an initial state by determining a temperature rise test pressure environment under a preset pressure condition, determining internal resistance of the magnetic pole at the termination of the temperature rise test by combining preset internal temperature of the magnetic pole and a magnetic pole material, then adjusting input current of the suspension electromagnet, determining termination voltage corresponding to the internal resistance of the magnetic pole at the termination under different input currents, obtaining voltage change conditions of the suspension electromagnet at all time periods under different input currents, further obtaining temperature change conditions according to a first formula or a corresponding relation between the surface temperature of the magnetic pole and the internal temperature of the magnetic pole, stopping the test when the voltage reaches the termination voltage, obtaining test data of the temperature rise test, and facilitating subsequent study on temperature rise characteristics of the electromagnet.
Description
Technical Field
The application relates to the technical field of electromagnets, in particular to a method and a device for a temperature rise test of a suspension electromagnet.
Background
The suspension electromagnet of the normally-conducting high-speed magnetic suspension train generates heat seriously, and under the high-speed running state, the running wind is favorable for the heat dissipation of the electromagnet, but considering that the high-speed magnetic suspension train can run under the low-pressure vacuum environment in the future, the heat dissipation condition of the electromagnet is more severe. In order to research the heat dissipation optimization scheme of the suspension electromagnet, a temperature rise test needs to be performed on the suspension electromagnet, the temperature rise characteristic of the suspension electromagnet needs to be researched, and a basis is provided for the research of the operation of the magnetic suspension train under the low-voltage condition. However, the temperature rise characteristic of the suspension electromagnet under the low-voltage condition is less studied.
Therefore, a method for testing temperature rise of a floating electromagnet under a predetermined pressure is needed in the art.
Disclosure of Invention
The application provides a method for suspension electromagnet temperature rise test can realize the research to suspension electromagnet temperature rise characteristic under the pressure condition of predetermineeing. The application also provides a device corresponding to the method.
In a first aspect, the present application provides a temperature rise test method for a suspension electromagnet, including:
placing the suspension electromagnet under a preset pressure condition, and acquiring the internal resistance of the magnetic pole of the suspension electromagnet in an initial state and the internal temperature of the magnetic pole of the suspension electromagnet in the initial state;
determining the internal resistance of the magnetic pole at the termination of the temperature rise test of the suspension electromagnet through a first formula according to the preset internal temperature of the magnetic pole at the termination of the temperature rise test of the suspension electromagnet, the internal resistance of the magnetic pole at the initial state of the suspension electromagnet, the internal temperature of the magnetic pole at the initial state of the suspension electromagnet, the magnetic pole material, the internal resistance of the magnetic pole at the temperature rise test of the suspension electromagnet and the internal temperature of the magnetic pole at the corresponding temperature rise test of the suspension electromagnet;
adjusting the input current value of the test device, determining termination voltages corresponding to the internal resistance of the termination magnetic pole under different input currents, acquiring the voltage change condition of the suspension electromagnet at the whole time interval under different input currents, and acquiring the internal temperature change condition of the magnetic pole of the suspension electromagnet at the whole time interval according to a first formula, or acquiring the internal temperature change condition of the magnetic pole of the suspension electromagnet at the whole time interval according to the corresponding relation between the surface temperature of the magnetic pole and the internal temperature of the magnetic pole;
and when the voltage value of the suspension electromagnet reaches the termination voltage, stopping the test.
In some possible implementation manners, placing the levitation electromagnet under a preset pressure condition, obtaining an internal resistance of a magnetic pole in an initial state of the levitation electromagnet and an internal temperature of the magnetic pole in the initial state of the levitation electromagnet, including:
placing the suspension electromagnet under a preset pressure condition, and inputting a preset current to the suspension electromagnet through a test device;
acquiring a voltage value of the suspension electromagnet under a preset current, and determining the internal resistance of a magnetic pole of the suspension electromagnet in an initial state;
and acquiring the surface temperature of the suspension electromagnet through a temperature sensor, and determining the internal temperature of the magnetic pole of the suspension electromagnet in the initial state.
In some possible implementations, the preset current is a current below a preset threshold.
In some possible implementations, the surface temperature of the levitation electromagnet includes a surface temperature of a plurality of test points of the levitation electromagnet.
In some possible implementations, the first formula includes:
wherein, T2 is the preset internal temperature of the magnetic pole at the termination of the temperature rise test of the suspension electromagnet, R1 is the internal resistance of the magnetic pole at the initial state of the suspension electromagnet, T1 is the internal temperature of the magnetic pole at the initial state of the suspension electromagnet, K is the temperature coefficient of the magnetic pole material, and R2 is the internal resistance of the magnetic pole at the termination of the temperature rise test of the suspension electromagnet.
The second aspect, the application provides a device of suspension electromagnet temperature rise test, and the device includes vacuum chamber, airtight ring flange, temperature sensor, DC power supply cabinet, cable, current clamp, voltage sensor and data processing device:
the vacuum chamber is used for providing a preset pressure test condition for the suspension electromagnet, and the airtight flange plate is used for ensuring the airtightness of the test;
the temperature sensor is used for acquiring the surface temperature of the magnetic pole of the suspension electromagnet;
the direct-current power supply cabinet and the cable are used for providing an input current value for a test, and the current clamp is used for acquiring the current value of the cable;
the voltage sensor is used for acquiring voltage values of the suspension electromagnet under different input currents;
the data processing device is used for determining the internal resistance of the magnetic pole at the termination of the suspension electromagnet temperature-rise test through a first formula according to the preset termination temperature of the suspension electromagnet temperature-rise test, the internal magnetic pole temperature of the suspension electromagnet in the initial state and the magnetic pole material, wherein the first formula represents the corresponding relationship among the internal magnetic pole resistance of the suspension electromagnet in the initial state, the internal magnetic pole temperature of the suspension electromagnet in the initial state, the magnetic pole material, the internal magnetic pole temperature of the suspension electromagnet temperature-rise test and the internal magnetic pole temperature of the corresponding suspension electromagnet temperature-rise test; determining termination voltages corresponding to the internal resistances of the termination magnetic poles under different input currents; and acquiring the internal temperature change condition of the magnetic pole of the suspension electromagnet at the whole time according to the first formula, or acquiring the internal temperature change condition of the magnetic pole of the suspension electromagnet at the whole time according to the corresponding relation between the surface temperature of the magnetic pole and the internal temperature of the magnetic pole.
In some possible implementations, the data processing apparatus is further configured to:
determining the internal resistance of the magnetic pole of the initial state of the suspended electromagnet according to the preset current value and the voltage value of the suspended electromagnet under the preset current, which is acquired by the voltage sensor;
and determining the internal temperature of the magnetic pole of the initial state of the suspension electromagnet according to the surface temperature of the suspension electromagnet obtained by the temperature sensor.
In some possible implementations, the preset current is a current below a preset threshold.
In some possible implementations, the surface temperature of the levitation electromagnet includes a surface temperature of a plurality of test points of the levitation electromagnet.
In some possible implementations, the first formula includes:
wherein, T2 is the preset termination temperature of the temperature rise test of the suspension electromagnet, R1 is the internal resistance of the magnetic pole in the initial state of the suspension electromagnet, T1 is the internal temperature of the magnetic pole in the initial state of the suspension electromagnet, K is the temperature coefficient of the magnetic pole material, and R2 is the internal resistance of the magnetic pole in the termination of the temperature rise test of the suspension electromagnet.
The present application can further combine to provide more implementations on the basis of the implementations provided by the above aspects.
According to the technical scheme, the embodiment of the application has the following advantages:
the embodiment of the application provides a temperature rise test method for a suspension electromagnet, which comprises the steps of obtaining internal resistance of a magnetic pole and internal temperature of the magnetic pole in an initial state by determining a preset temperature rise test pressure environment, determining internal resistance of the magnetic pole for termination of the temperature rise test by combining preset internal temperature of the magnetic pole for termination with a magnetic pole material, then adjusting input current of the suspension electromagnet, determining termination voltage corresponding to the internal resistance of the magnetic pole for termination under different input currents, obtaining voltage change conditions of the suspension electromagnet at all time intervals under different input currents, further obtaining temperature change conditions according to a first formula or a corresponding relation between surface temperature of the magnetic pole and the internal temperature of the magnetic pole, and stopping the test when the voltage reaches the termination voltage. Therefore, test data of the temperature rise test are obtained, and subsequent study on the temperature rise characteristic of the electromagnet is facilitated.
Drawings
In order to more clearly illustrate the technical method of the embodiments of the present application, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without inventive labor.
Fig. 1 is a schematic structural diagram of a device for a temperature rise test of a suspension electromagnet according to an embodiment of the present application;
fig. 2 is a schematic flow chart of a method for a temperature rise test of a suspension electromagnet according to an embodiment of the present disclosure;
fig. 3 is a schematic view of an internal and external structure of a vacuum chamber in a temperature rise test of a suspension electromagnet according to an embodiment of the present application;
fig. 4 is a schematic distribution diagram of temperature test points in a temperature rise test of a suspension electromagnet according to an embodiment of the present application.
Detailed Description
The scheme in the embodiments provided in the present application will be described below with reference to the drawings in the present application.
The terms "first" and "second" in the embodiments of the present application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
Some technical terms referred to in the embodiments of the present application will be first described.
An electromagnet is a device that generates an electromagnetic field when energized. The electromagnet has a core wound with a winding, which is magnetic like a magnet when energized. The suspension electromagnet consists of an electric part and a mechanical part, wherein the magnetic pole of the electric part is a main heating part, and the mechanical part is a bearing structure of the electromagnet and is used for fixing the whole electromagnet and a tool. In some possible implementations, the levitation electromagnet comprises 12 levitation magnetic poles with a power supply cable of 6 square millimeters (mm)2) The magnetic pole is arranged on a U-shaped box of the suspension electromagnet bearing structure, the mounting interface of the suspension electromagnet is square holes on two sides, and the bottom of the U-shaped box is a plane and can fix the tool.
The temperature rise of the electromagnet means that the electromagnet works according to designed input parameters at a standard environment temperature, usually 20 ℃ (DEG C), the temperature of the electromagnet rises, and when the temperature fluctuation reaches balance, the temperature of the internal resistance rise of the electromagnet is the temperature rise of the electromagnet. The temperature rise of the electromagnet needs to be obtained, and the internal temperature of the electromagnet is generally difficult to obtain.
In view of the above, the present application provides a temperature-rise test method for a floating electromagnet, which can be performed by a temperature-rise test device for a floating electromagnet, as shown in fig. 1, comprising a vacuum chamber 101, an airtight flange 102, a temperature sensor 103, a dc power cabinet 104, a cable 105, a current clamp 106, a voltage sensor 107 and a data processing device 108.
Specifically, the suspension electromagnet is placed under a preset test condition, the internal resistance of the magnetic pole and the internal temperature of the magnetic pole in the initial state of the suspension electromagnet are obtained, the internal resistance of the magnetic pole in the termination state of the temperature rise test is determined according to the preset termination temperature and the magnetic pole material of the temperature rise test and by combining the internal resistance of the magnetic pole in the initial state and the internal temperature of the magnetic pole, then the input current value of the test device is adjusted, the termination voltages corresponding to the internal resistance of the termination magnetic pole under different input currents are determined, the voltage change conditions under different currents and the temperature change conditions are obtained, and when the voltage value reaches the termination voltage, the test is stopped, so that the data of the electromagnet temperature rise test in the whole time period are obtained, and the temperature rise test is convenient to study.
In order to facilitate understanding of the technical scheme of the present application, the temperature rise test method for the suspension electromagnet provided by the present application is described below with reference to fig. 2.
Referring to a flow chart of the temperature rise test method of the suspension electromagnet shown in fig. 2, the specific steps of the method are as follows.
S202: and (3) placing the suspension electromagnet under a preset pressure test condition, and obtaining the internal resistance of the magnetic pole of the suspension electromagnet in the initial state and the internal temperature of the magnetic pole of the suspension electromagnet in the initial state.
The test conditions of the preset pressure can be any pressure, such as: high pressure, low pressure or normal pressure. Wherein the pressure of the low pressure test condition is below a preset threshold. In some possible implementations, the levitation electromagnet is placed in a vacuum test chamber, and the pressure environment in the vacuum chamber 101 is set to be a low pressure environment, which may be 10 kilopascals (kPa), 20kPa, 30kPa, or 40kPa, for example. When the pressure is low to a certain degree, a vacuum environment is formed in the vacuum chamber 101.
The arrangement of the vacuum chamber 101 can be as shown in fig. 3, the chamber comprises an insulating tool for installing a suspension electromagnet, temperature measuring points are arranged on the surface of the suspension electromagnet, and the surface temperature of the suspension electromagnet is obtained through a patch type temperature sensor 103. Alternatively, the distribution of the temperature measurement points may be as shown in fig. 4, and may specifically include the pole gap position test point and the pole winding side test point. Correspondingly, table 1 shows the correspondence between the temperature sensor 103 channel and the test point.
TABLE 1 temperature sensor channel and test point correspondences
The temperature test points at different positions are selected, and temperature test points with marking properties, such as the highest temperature point and the maximum temperature change point, can be obtained in an experiment, so that the temperature change of the surface of the magnetic pole can be represented by the point at the position in the subsequent similar experiment, and the experiment is simplified.
Therefore, the internal temperature of the magnetic poles at different positions of the initial state of the suspension electromagnet can be obtained. Cables inside and outside the vacuum chamber 101 are transited through an airtight flange plate 102 to ensure airtightness inside the vacuum chamber 101.
The internal resistance of the magnetic pole in the initial state of the levitation electromagnet can be obtained in advance, and can also be obtained through the current clamp 106 and the voltage sensor 107.
In some possible implementations, a small current, for example, 5 amperes (amp, a), may be applied to the floating electromagnet through an external power supply cabinet, a voltage value at this time is obtained through a voltage sensor, an internal resistance value of the floating electromagnet at this time is obtained through calculation, and is used as an internal resistance value of the magnetic pole in an initial state, and a temperature at this time is recorded through a surface temperature sensor, so as to obtain an internal temperature of the magnetic pole in the initial state.
The magnetic pole internal temperature and the magnetic pole surface temperature have a corresponding relationship, and the corresponding relationship can be obtained in various ways. For example, in the present application, the internal temperature of the magnetic pole can be obtained through data processing of a temperature rise test, and meanwhile, the temperature sensor in the present application can obtain the surface temperature of the magnetic pole in the same time and current state, so that the corresponding relationship between the internal temperature of the magnetic pole and the surface temperature of the magnetic pole can be established.
S203: and determining the internal resistance of the magnetic pole of the suspension electromagnet temperature rise test through a first formula according to the preset termination temperature of the suspension electromagnet temperature rise test, the internal resistance of the magnetic pole of the suspension electromagnet in the initial state, the internal temperature of the magnetic pole of the suspension electromagnet in the initial state and the magnetic pole material.
The first formula represents the corresponding relation between the internal resistance of the magnetic pole in the initial state of the suspension electromagnet, the internal temperature of the magnetic pole in the initial state of the suspension electromagnet, the magnetic pole material, the internal resistance of the magnetic pole in the temperature rise test of the suspension electromagnet and the internal temperature of the magnetic pole in the temperature rise test of the corresponding suspension electromagnet.
In some possible implementations, the first formula may be as shown in formula (1):
wherein, T2 is the preset internal temperature of the magnetic pole at the termination of the temperature rise test of the suspension electromagnet, R1 is the internal resistance of the magnetic pole at the initial state of the suspension electromagnet, T1 is the internal temperature of the magnetic pole at the initial state of the suspension electromagnet, K is the temperature coefficient of the magnetic pole material, and R2 is the internal resistance of the magnetic pole at the termination of the temperature rise test of the suspension electromagnet.
For example, the maximum temperature T2 of the internal temperature of the magnetic pole may be set to 130 ℃, according to S1, the internal resistance R1 of the magnetic pole in the initial state of the levitation electromagnet is known, the internal temperature T1 of the magnetic pole in the initial state of the levitation electromagnet is known, and the temperature coefficient K of the magnetic pole material is known, so that the internal resistance R2 of the magnetic pole at the end of the temperature rise test of the levitation electromagnet can be calculated.
S204: and adjusting the input current value of the test device, determining the termination voltage corresponding to the internal resistance of the termination magnetic pole under different input currents, and acquiring the voltage change condition and the temperature change condition of the suspension electromagnet at the whole time under different input currents.
Specifically, the internal resistance of the magnetic pole of the suspension electromagnet under different input currents is determined according to the input current value and the voltage value of the suspension electromagnet through a resistance law.
The vacuum chamber 101 also comprises a power supply cable 105, and the other end of the cable 105 is connected with a direct current power supply cabinet 104 outside the vacuum chamber 101 and used for supplying power to the suspension electromagnet. The power supply cable 105 is provided with a current clamp 106 for acquiring a current value, and a voltage sensor 107 is connected to a power supply interface for acquiring a voltage value of the suspension electromagnet.
The vacuum chamber 101 may include a dc power supply cabinet 104, a voltage and current testing device, a collecting device, a data processing device 108 (which may be a laptop), a power supply, a sensor cable, an airtight connector, an airtight flange, a forklift, a crown block, and a power plug. Table 2 provides a specific distribution of equipment capable of performing the present experiment, as shown in table 2.
TABLE 2 test equipment table
And after the test device is connected and stabilized, adjusting the input current value of the test device, wherein the input current value of the test device can be adjusted by adjusting the output current value of the direct current power supply cabinet 104. Alternatively, the output current of the dc power cabinet 104 may be 5A.
And determining the corresponding termination voltage under the input current through ohm's law according to the output value of the direct-current power supply cabinet 104 and the calculated termination magnetic pole internal resistance, and stopping the test when the voltage value obtained by the voltage sensor 107 reaches the termination voltage.
The current clamp 106, the voltage sensor 107 and the temperature sensor 103 can be connected with an external collecting device, and the collecting device respectively collects the current value, the voltage value and the temperature of the suspension electromagnet at regular collecting periods. The acquisition period can be 1 second/time, and the acquisition of voltage, current and temperature can adopt a time synchronization acquisition mode.
The output current of the dc power supply cabinet 104 may also be 20A, 25A, 30A, etc., and the temperature threshold of the highest temperature point may be 120 ℃. Alternatively, the test conditions may be as shown in table 3.
Table 3 test conditions of temperature rise test of suspension electromagnet
In some possible implementations, the device further includes a thermal imaging camera for continuously observing the temperature change of the suspension electromagnet during the temperature rise test. The thermal imager can be compared with the temperature sensor 103, so that the temperature can be acquired more accurately. Wherein the thermal imager may be an infrared imager.
In the process of carrying out the tests, the initial temperature of each test is ensured to be consistent as much as possible.
In the test process, data such as current, voltage, surface temperature, time and the like are continuously acquired, and the voltage change condition of the suspension electromagnet in the whole period and the internal temperature change condition of the magnetic pole in the whole period are acquired.
In some possible implementations, the internal temperature of the magnetic pole can also be determined according to equation (1), and equation (1) can be converted into equation (2).
Wherein K is the temperature coefficient of the material. The temperature coefficient of the aluminum winding is 225.
Therefore, the internal temperature of the magnetic pole of the suspension electromagnet under different input currents can be obtained, and the internal temperature change condition of the magnetic pole in the whole time can be obtained.
In some possible implementations, the internal temperature of the magnetic pole can also be obtained by the correspondence between the internal temperature of the magnetic pole and the temperature of the surface of the magnetic pole.
S205: and when the voltage value of the suspension electromagnet reaches the termination voltage, stopping the test.
When the voltage value of the suspension electromagnet reaches the termination voltage, the test is stopped to protect the suspension electromagnet, and the suspension electromagnet is prevented from being burnt out.
Therefore, the corresponding relation among the voltage, the internal resistance, the surface temperature of the magnetic pole, the internal temperature of the magnetic pole and the time of the suspension electromagnet under different input currents can be obtained, and the temperature rise test data can be obtained.
Therefore, an experiment report can be compiled according to the experiment data.
In some possible implementations, the trial report may include the following information:
(1) testing basic information such as the type, the factory number, the manufacturer, the production date and the like of the sample piece electromagnet;
(2) collecting the obtained data of voltage, current, magnetic pole surface temperature, magnetic pole internal temperature and time;
(3) obtaining a current and electromagnet internal temperature change curve under different pressure environments according to test data;
(4) and obtaining the change curve of the internal temperature and the time of the electromagnet under different pressure environments according to the test data.
(5) According to the test data, obtaining a relation curve of the surface temperature of the magnetic pole of the electromagnet and the time under different pressure environments;
(6) according to the test data, obtaining a relation curve of the internal resistance of the magnetic pole of the electromagnet and the time under different pressure environments;
(7) according to the test data, obtaining a relation curve of the internal temperature and the time of the electromagnetic iron pole under different pressure environments;
(8) according to the test data, obtaining a relation curve of the power supply voltage of the electromagnet and the time under different pressure environments;
(9) and according to the test data, obtaining the corresponding relation between the internal temperature of the magnetic pole and the surface temperature of the magnetic pole, thereby establishing a prediction model of the internal temperature and the surface temperature of the magnetic pole. In this way, the internal temperature of the magnetic pole can be calibrated through the surface temperature.
The different pressure environments can be various low-pressure environments, various high-pressure environments, and both low-pressure environments and high-pressure environments.
In summary, the present application provides a temperature rise test method for a suspension electromagnet, the method includes placing the suspension electromagnet under a test condition of a preset pressure, obtaining internal resistance of a magnetic pole and internal temperature of the magnetic pole in an initial state, then combining the preset internal temperature of a termination magnetic pole, obtaining internal resistance of the termination magnetic pole, adjusting an input current value of the test, obtaining termination voltages under different input currents, then obtaining voltage variation conditions of the suspension electromagnet at all time periods under different input currents and variation conditions of the internal temperature of the magnetic pole, and stopping the test when the termination voltage is reached. Therefore, test data of the temperature rise test can be obtained, so that the temperature rise characteristic of the suspension electromagnet under the preset pressure condition can be researched, and the further development of the suspension electromagnet is facilitated.
Corresponding to the above method embodiment, the present application also provides a device for temperature rise test of a suspension electromagnet, referring to fig. 1, where the device 100 includes: vacuum chamber 101, airtight flange 102, temperature sensor 103, dc power cabinet 104, cable 105, current clamp 106, voltage sensor 107 and data processing device 108:
the vacuum chamber is used for providing a preset pressure test condition for the suspension electromagnet, and the airtight flange plate is used for ensuring the airtightness of the test;
the temperature sensor is used for acquiring the surface temperature of the magnetic pole of the suspension electromagnet;
the direct-current power supply cabinet and the cable are used for providing an input current value for a test, and the current clamp is used for acquiring the current value of the cable;
the voltage sensor is used for acquiring voltage values of the suspension electromagnet under different input currents;
the data processing device is used for determining the internal resistance of the magnetic pole at the termination of the suspension electromagnet temperature-rise test through a first formula according to the preset termination temperature of the suspension electromagnet temperature-rise test, the internal magnetic pole temperature of the suspension electromagnet in the initial state and the magnetic pole material, wherein the first formula represents the corresponding relationship among the internal magnetic pole resistance of the suspension electromagnet in the initial state, the internal magnetic pole temperature of the suspension electromagnet in the initial state, the magnetic pole material, the internal magnetic pole temperature of the suspension electromagnet temperature-rise test and the internal magnetic pole temperature of the corresponding suspension electromagnet temperature-rise test; determining termination voltages corresponding to the internal resistances of the termination magnetic poles under different input currents; and acquiring the internal temperature change condition of the magnetic pole of the suspension electromagnet at the whole time according to the first formula, or acquiring the internal temperature change condition of the magnetic pole of the suspension electromagnet at the whole time according to the corresponding relation between the surface temperature of the magnetic pole and the internal temperature of the magnetic pole.
In some possible implementations, the data processing apparatus is further configured to:
determining the internal resistance of the magnetic pole of the initial state of the suspended electromagnet according to the preset current value and the voltage value of the suspended electromagnet under the preset current, which is acquired by the voltage sensor;
and determining the internal temperature of the magnetic pole of the initial state of the suspension electromagnet according to the surface temperature of the suspension electromagnet obtained by the temperature sensor.
In some possible implementations, the preset current is a current below a preset threshold.
In some possible implementations, the surface temperature of the levitation electromagnet includes a surface temperature of a plurality of test points of the levitation electromagnet.
In some possible implementations, the first formula includes:
wherein, T2 is the preset termination temperature of the temperature rise test of the suspension electromagnet, R1 is the internal resistance of the magnetic pole in the initial state of the suspension electromagnet, T1 is the internal temperature of the magnetic pole in the initial state of the suspension electromagnet, K is the temperature coefficient of the magnetic pole material, and R2 is the internal resistance of the magnetic pole in the termination of the temperature rise test of the suspension electromagnet.
It should be noted that the above-described embodiments of the apparatus are merely schematic, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiments of the apparatus provided in the present application, the connection relationship between the modules indicates that there is a communication connection therebetween, and may be implemented as one or more communication buses or signal lines.
Through the above description of the embodiments, those skilled in the art will clearly understand that the present application can be implemented by software plus necessary general-purpose hardware, and certainly can also be implemented by special-purpose hardware including special-purpose integrated circuits, special-purpose CPUs, special-purpose memories, special-purpose components and the like. Generally, functions performed by computer programs can be easily implemented by corresponding hardware, and specific hardware structures for implementing the same functions may be various, such as analog circuits, digital circuits, or dedicated circuits. However, for the present application, the implementation of a software program is more preferable. Based on such understanding, the technical solutions of the present application may be substantially embodied in the form of a software product, which is stored in a readable storage medium, such as a floppy disk, a usb disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, an exercise device, or a network device) to execute the method according to the embodiments of the present application.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product.
Claims (10)
1. A method for a temperature rise test of a suspension electromagnet is characterized by comprising the following steps:
placing the suspension electromagnet under a preset pressure condition, and obtaining the internal resistance of the magnetic pole of the suspension electromagnet in the initial state and the internal temperature of the magnetic pole of the suspension electromagnet in the initial state;
determining the internal resistance of the magnetic pole at the termination of the suspension electromagnet temperature-rise test through a first formula according to the preset internal temperature of the magnetic pole at the termination of the suspension electromagnet temperature-rise test, the internal resistance of the magnetic pole at the initial state of the suspension electromagnet, the internal temperature of the magnetic pole at the initial state of the suspension electromagnet, the magnetic pole material, the internal resistance of the magnetic pole at the suspension electromagnet temperature-rise test and the internal temperature of the magnetic pole at the corresponding suspension electromagnet temperature-rise test;
adjusting the input current value of a test device, determining the termination voltage corresponding to the termination magnetic pole internal resistance under different input currents, acquiring the voltage change condition of the suspension electromagnet in the whole time period under different input currents, acquiring the magnetic pole internal temperature change condition of the suspension electromagnet in the whole time period according to the first formula, or acquiring the magnetic pole internal temperature change condition of the suspension electromagnet in the whole time period according to the corresponding relation between the magnetic pole surface temperature and the magnetic pole internal temperature;
and when the voltage value of the suspension electromagnet reaches the termination voltage, stopping the test.
2. The method according to claim 1, wherein the step of obtaining the internal resistance of the magnetic pole in the initial state of the levitation electromagnet and the internal temperature of the magnetic pole in the initial state of the levitation electromagnet by placing the levitation electromagnet under a preset pressure condition comprises:
placing the suspension electromagnet under a preset pressure condition, and inputting a preset current to the suspension electromagnet through a test device;
acquiring the voltage value of the suspension electromagnet under the preset current, and determining the internal resistance of the magnetic pole of the suspension electromagnet in the initial state;
and acquiring the surface temperature of the suspension electromagnet through a temperature sensor, and determining the internal temperature of the magnetic pole of the suspension electromagnet in the initial state.
3. The method of claim 2, wherein the preset pressure condition is a preset low pressure condition and the preset current is a current below a preset threshold.
4. The method of claim 2, wherein the surface temperature of the levitation electromagnet comprises a surface temperature of a plurality of test points of the levitation electromagnet.
5. The method of claim 1, wherein the first formula comprises:
the temperature control method comprises the steps of obtaining a temperature coefficient of a magnetic pole material, wherein T2 is the preset internal temperature of the magnetic pole at the termination of the temperature rise test of the suspension electromagnet, R1 is the internal resistance of the magnetic pole at the initial state of the suspension electromagnet, T1 is the internal temperature of the magnetic pole at the initial state of the suspension electromagnet, K is the temperature coefficient of the magnetic pole material, and R2 is the internal resistance of the magnetic pole at the termination of the temperature rise test of the suspension electromagnet.
6. The utility model provides a device of suspension electromagnet temperature rise test, a serial communication port, the device includes vacuum chamber, airtight ring flange, temperature sensor, DC power supply cabinet, cable, current clamp, voltage sensor and data processing device:
the vacuum chamber is used for providing conditions for the suspension electromagnet to perform a preset pressure test, and the airtight flange plate is used for ensuring the airtightness of the test;
the temperature sensor is used for acquiring the surface temperature of the magnetic pole of the suspension electromagnet;
the direct-current power supply cabinet and the cable are used for providing an input current value for a test, and the current clamp is used for acquiring the current value of the cable;
the voltage sensor is used for acquiring voltage values of the suspension electromagnet under different input currents;
the data processing device is used for determining the internal resistance of the magnetic pole of the suspension electromagnet temperature rise test through a first formula according to the preset termination temperature of the suspension electromagnet temperature rise test, the internal magnetic pole temperature of the suspension electromagnet in the initial state and the magnetic pole material, wherein the first formula represents the corresponding relationship among the internal magnetic pole temperature of the suspension electromagnet in the initial state, the magnetic pole material, the internal magnetic pole temperature of the suspension electromagnet temperature rise test and the corresponding internal magnetic pole temperature of the suspension electromagnet temperature rise test; determining termination voltages corresponding to the internal resistances of the termination magnetic poles under different input currents; and acquiring the internal temperature change condition of the magnetic pole of the suspension electromagnet in the whole time period according to the first formula, or acquiring the internal temperature change condition of the magnetic pole of the suspension electromagnet in the whole time period according to the corresponding relation between the surface temperature of the magnetic pole and the internal temperature of the magnetic pole.
7. The apparatus of claim 6, wherein the data processing apparatus is further configured to:
determining the internal resistance of the magnetic pole of the initial state of the suspended electromagnet according to a preset current value and the voltage value of the suspended electromagnet under the preset current, which is acquired by the voltage sensor;
and determining the internal temperature of the magnetic pole of the initial state of the suspension electromagnet according to the surface temperature of the suspension electromagnet obtained by the temperature sensor.
8. The apparatus of claim 7, wherein the predetermined current is a current below a predetermined threshold.
9. The apparatus of claim 7, wherein the surface temperature of the levitation electromagnet comprises a surface temperature of a plurality of test points of the levitation electromagnet.
10. The apparatus of claim 6, wherein the first formula comprises:
the temperature testing method comprises the steps of testing the temperature of the suspension electromagnet, wherein T2 is the preset termination temperature of the temperature rise test of the suspension electromagnet, R1 is the internal resistance of the magnetic pole of the suspension electromagnet in the initial state, T1 is the internal temperature of the magnetic pole of the suspension electromagnet in the initial state, K is the temperature coefficient of the magnetic pole material, and R2 is the internal resistance of the magnetic pole of the temperature rise test of the suspension electromagnet.
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