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Short-time excitation temperature rise equivalent test method adapting to nonlinear heat dissipation condition

An equivalent test and non-linear technology, applied in the field of effective test, can solve the problems of precision drop and achieve the effect of improving precision, simple calculation process and small error

Active Publication Date: 2020-01-07
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the accuracy of the existing short-time load excitation equivalent test method for motor temperature rise is reduced under the influence of nonlinear heat dissipation conditions, and to provide a short-time excitation temperature rise equivalent test method that adapts to nonlinear heat dissipation conditions method

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  • Short-time excitation temperature rise equivalent test method adapting to nonlinear heat dissipation condition
  • Short-time excitation temperature rise equivalent test method adapting to nonlinear heat dissipation condition
  • Short-time excitation temperature rise equivalent test method adapting to nonlinear heat dissipation condition

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specific Embodiment approach 1

[0027] Specific implementation mode 1: This implementation mode records a short-time excitation temperature rise equivalent test method adapted to nonlinear heat dissipation conditions, and the steps of the method are as follows:

[0028] Step 1: This method requires two short-time tests of the motor with different loading levels. For the convenience of expression, the one with a smaller loading level is recorded as test 1, and the one with a larger loading level is recorded as test 2. The loading level of test 2 is It is k times of test 1, 1

[0029] First, the motor works for a short time under the loading condition of test 1, so that the motor starts from the initial time t under the load condition of test 1 0 start working till t 1 time, followed by t 1 Remove the load at all times, so that the motor is cooled under the same cooling conditions as when it was loaded (referring to natural cooling, air cooling, etc., the state remains unchanged), and record the tempera...

Embodiment 1

[0037] Embodiment 1 records a short-term excitation temperature rise equivalent test method adapted to nonlinear heat dissipation conditions, which is a first-order heat transfer relationship, and the heating surface of the heating element directly contacts the air, so it is most seriously affected by natural convection. Among them, the natural convection heat transfer coefficient α has a nonlinear relationship with the temperature rise ΔT, and the expression is about:

[0038] The specific test steps are as follows:

[0039]Step 1: This embodiment requires two short-term tests of the motor with different loading levels. For the convenience of expression, the one with a smaller loading level is recorded as Test 1, the loading power is 100W, and the one with a larger loading level is recorded as Test 1 2. The loading power is 200W, and the loading degree of test 2 is twice that of test 1, k=2;

[0040] First, the motor works for a short time under the loading condition of Te...

Embodiment 2

[0047] Embodiment 2 records a short-time excitation temperature rise equivalent test method adapted to nonlinear heat dissipation conditions, which is a third-order heat transfer relationship, the heat of the heating element is transferred to other objects, and the heat dissipation surface of the outermost object directly contacts the air , the temperature rise test point is the heat dissipation surface of the outermost object. The heat dissipation surface is affected by natural convection, and its natural convection heat transfer coefficient α has a nonlinear relationship with the temperature rise ΔT, and its expression is approximately: The specific test steps are as follows:

[0048] Step 1: This method requires two short-term tests of the motor with different loading levels. For the convenience of expression, the one with a smaller loading level is recorded as Test 1, the loading power is 100W, and the one with a larger loading level is recorded as Test 2. , the loading ...

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Abstract

The invention, which belongs to the technical field of motor testing, discloses a short-time excitation temperature rise equivalent test method adapting to a nonlinear heat dissipation condition. Themethod comprises the following steps that a motor works for short time under a loading working condition of a test I and thus the motor works from a starting time t0 to a t1 time under the load condition of the test I, the load is removed at the t1 time, the motor is cooled under the same cooling condition in loading, data TR1(t) of the temperature rise of the motor with the time change in the testing during the whole short-time loading testing process, wherein the temperature rise is the difference between a tested motor component temperature and an environment temperature; the motor works for short time under the loading condition of a test II, the test process is the same as the short-time work of the motor under the loading condition of the test I, data TR2 (t) of the temperature riseof the motor with the time change in the test are recorded during the whole short-time loading test process; and then data operation is carried out. According to the invention, the motor can be in a natural cooling state for long time as long as the motor is excited within short time, so that the energy consumption is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of motor testing, and in particular relates to a short-time excitation temperature rise equivalent testing method adapted to nonlinear heat dissipation conditions. 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 maintain it in the expected test state. After the temperature is stable, the temperature rise value of the motor can be obtained through the temperature sensor or the thermal state resi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/34
CPCG01R31/343
Inventor 王宝超刘承军胡建辉李勇江善林王骞尚静
Owner HARBIN INST OF TECH
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