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An equivalent test method for motor temperature rise with multiple load excitations

A technology of equivalent testing and temperature rise, applied in the direction of motor generator testing, etc., can solve the problems of difficult temperature rise test method and high energy consumption, avoid the risk of motor damage, simplify the calculation process, and reduce the risk of high temperature damage Effect

Active Publication Date: 2021-03-23
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of high difficulty and high energy consumption in the existing motor temperature rise test method, and to provide an equivalent test method for motor temperature rise with multiple load excitations, specifically a method that utilizes multiple load short The test method to restore the temperature rise value and the dynamic process of temperature rise under the continuous excitation state of the motor load from the test data under the constant excitation state

Method used

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  • An equivalent test method for motor temperature rise with multiple load excitations
  • An equivalent test method for motor temperature rise with multiple load excitations
  • An equivalent test method for motor temperature rise with multiple load excitations

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specific Embodiment approach 1

[0025] Specific implementation mode 1: This implementation mode records an equivalent test method for motor temperature rise with multiple load excitations, and the steps of the method are as follows:

[0026] Step 1: Multiple load short-time excitation of the motor: make the motor perform multiple short-time load excitations under the expected test conditions, and the motor cools freely between multiple short-time load excitations; during this process, the temperature of the motor There are rising and falling fluctuations when the load is excited, but it is not necessary to achieve a stable temperature rise, and finally remove the load to cool the motor; the range of temperature rise during the test is more than 1% of the rated temperature rise; during the working process of the motor, Ambient temperature T E The data that changes with time is denoted as T E (t), the temperature T of motor components (such as windings, casings, cores, end covers, bearings) M The data that c...

Embodiment 1

[0033]Indirect test experiment of motor temperature rise under two load excitations. load excitation signal such as figure 2 As shown, "1" in the figure means loading, and "0" means unloading. by figure 2 Excite the motor with the load shown, record the temperature value T of the motor part (winding) measured by the temperature sensor throughout the process M (t). During the test, the ambient temperature is considered to be basically constant, approximately a constant value, T E (t)=T M (t 0 ). Calculate the temperature rise data T of the motor during this process R (t)=T M (t)-T E (t)=T M (t)-T M (t 0 ), the data such as figure 1 The circle marks the curve shown in the middle. By formula (1)

[0034]

[0035] Calculate the data T' of the continuous excitation state of the load R (t), such as figure 1 The middle triangle marks the curve. In addition, the temperature rise curve of the motor under the condition of rated load is obtained by the conventional...

Embodiment 2

[0037] Indirect test experiment of motor temperature rise under three load excitations. load excitation signal such as Figure 4 As shown, "1" in the figure means loading, and "0" means unloading. by Figure 4 Excite the motor with the load shown, record the temperature value T of the motor parts during the whole process M (t). During the test, the ambient temperature is considered to be basically constant, approximately a constant value, T E (t)=T M (t 0 ). Calculate the temperature rise data T of the motor during this process R (t)=T M (t)-T E (t)=T M (t)-T M (t 0 ), the data such as image 3 The circle marks the curve shown in the middle. The data T′ of the load continuous excitation state is calculated by the formula (1) R (t), such as image 3 The middle triangle marks the curve. In addition, the temperature rise curve of the motor under the condition of rated load is obtained by the conventional method as follows: image 3 The middle diamond marks the c...

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Abstract

A motor temperature rise equivalence test method of multiple load excitation belongs to the motor test technology field. The invention is a test method of using test data under a motor multiple load short-time excitation state to restore temperature-rise data under a continuous excitation state of a motor load. The method has advantages that the test data under the motor multiple load short-time excitation state is used to indirectly acquire the temperature-rise data under the continuous excitation state of the motor load, and during a test process, a motor temperature rise is lower than a temperature rise value of load continuous excitation so that a high temperature motor damage risk is reduced; a motor only needs short time excitation so that the motor can be in a natural cooling statein a long time and energy consumption can be effectively reduced; a calculation process is simple and operation is easy; and prior knowledge of a motor model, a loss model, a system correlation attribute and the like do not need to be used, and an order of a heat transfer function and a specific parameter do not need to be acquired.

Description

technical field [0001] The invention belongs to the technical field of motor temperature rise testing, and relates to an equivalent test method for motor temperature rise with multiple load excitations, in particular to a method for restoring the continuous excitation state of motor loads by using test data in the short-term excitation state of multiple loads of the motor The test method of temperature rise data. Background technique [0002] The temperature rise of the motor affects the reliability and service life of the insulation in the motor, and is closely related to the safety and reliability of the motor and its application equipment. Therefore, it is of great significance to accurately obtain the temperature rise of specific load working conditions such as motor rating and overload to verify the rationality and reliability of the motor design. [0003] At present, the method of temperature rise test for a specific working state is to continuously load the motor and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/34
CPCG01R31/34
Inventor 王宝超王骞赵猛李勇尚静江善林刘承军胡建辉赵博
Owner HARBIN INST OF TECH
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