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Variable frequency motor use temperature measuring method and device, computer and storage medium

A technology for temperature measurement and variable frequency motors, applied in devices, temperature measurement methods for variable frequency motors, computers and storage media, can solve problems such as long test time, increased heat generation, inter-turn breakdown, etc., and achieve short and accurate test time High performance and easy operation

Pending Publication Date: 2022-05-13
ZHUHAI GREE ELECTRIC ENTERPRISES +4
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AI Technical Summary

Problems solved by technology

However, the pulse power supply for frequency conversion technology has the characteristics of extremely steep rising edge, fast pulse voltage change speed, high repetition rate, and high frequency. These characteristics cause serious partial discharge on the enameled wire inside the frequency conversion motor, accompanied by loss and heat generation. Increase, wear, mechanical vibration, turn-to-turn breakdown and other phenomena lead to premature failure of the variable frequency motor
[0003] Studies have shown that the higher the load voltage of the variable frequency motor, the repetition rate of partial discharge of the internal corona-resistant enameled wire increases proportionally, so that the partial discharge inside the insulating material is strengthened, the strength and frequency of electron or charge impacting the insulating material increase, and the calorific value increases. , causing the frequency conversion motor to burn out due to excessive temperature
At present, although the temperature index test can be used to evaluate the maximum service temperature of the enameled wire, the principle of this method is to test the failure time of the enameled wire under at least 3 different aging temperatures, and extrapolate the enameled wire through three-point fitting analysis. The highest service temperature cannot test the service temperature of enameled wire at any voltage; on the other hand, the test time is longer, often half a year, so it is of great significance to study the test method of the maximum service temperature of corona-resistant enameled wire at any load voltage

Method used

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  • Variable frequency motor use temperature measuring method and device, computer and storage medium
  • Variable frequency motor use temperature measuring method and device, computer and storage medium
  • Variable frequency motor use temperature measuring method and device, computer and storage medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] In the example, such as figure 1 As shown, a method for measuring the temperature of a variable frequency motor is provided, which includes:

[0053] Step 110, acquiring a first load voltage.

[0054] In this embodiment, the first load voltage is a test voltage. In one round of testing, a voltage value is selected as the first load voltage for testing. Under the first load voltage, tests are performed multiple times. Subsequently, in the next round of testing, another voltage value is selected as the second load voltage and tested again.

[0055] Step 120: Perform a corona resistance test on the enameled wire based on the first load voltage, and measure the corona resistance time of the enameled wire at a plurality of different temperatures under the first load voltage.

[0056] Specifically, the enameled wire is a corona-resistant enameled wire. In this embodiment, the corona-resistant time of the enameled wire at different temperatures is measured under the first lo...

Embodiment 2

[0100] 1. Using corona-resistant enameled wire with a conductor of 0.60mm and a paint film thickness of 74±1um as raw materials, under the condition of a load voltage of 3.5kV, test its temperature at different temperatures (175°C, 155°C, 135°C, 115°C, ℃) The corona resistance time of the sample;

[0101] 2. Refer to the national standard corona resistance time data selection principle, arrange the corona resistance time from small to large, take the average value of the first value and the third value as the corona resistance time of the sample; the above corona resistance The corona resistance time of enameled wire at different temperatures is shown in Table 6:

[0102] Table 6: Corona resistance time of enameled wire at different temperatures

[0103]

[0104] Select the default fitting equation as:

[0105] t=Ae B / T

[0106] Take the logarithm based on e on both sides of the equation to get: Ln(t)=B×1 / T+Ln(A);

[0107] Take the reciprocal (1 / T) and logarithm (Ln(t)...

Embodiment 3

[0122] Adopt the test condition identical with embodiment two, change preset fitting equation into t=kT-n, repeat test step and obtain the fitting relation of T and U as:

[0123] Ln(t)=-2.166Ln(T)+11.368

[0124] t=e-2.166Ln(T)+11.368

[0125] =T-2.166×e11.368

[0126] =86508.67×T-2.166

[0127] Where k=86508.67, n=-2.166

[0128] The process of solving k and n in this embodiment is similar to the process of solving A and B in embodiment two, making Ln(t)>0, and solving T<190.25

[0129] Therefore, the maximum service temperature of the corona-resistant enameled wire of this specification solved by the fitting equation is about 190.25°C when the load voltage is 3.5kV.

[0130] In addition, keeping other conditions unchanged, both sides of the preset fitting equation t=AeB / T, t=kT-n, etc. can be taken as logarithms with any positive integer as the base, such as Log2(t), Log3(t) , Log4(t), Log5(t), Logn(t) (where n is an integer greater than 1), etc.

[0131] In addition,...

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Abstract

The invention provides a variable frequency motor use temperature measuring method and device, a computer and a storage medium. The method comprises the steps that first load voltage is acquired; carrying out corona resistance test on the enameled wire based on the first load voltage, and measuring corona resistance time of the enameled wire at multiple different temperatures under the first load voltage; fitting to obtain a function relationship between the temperature of the enameled wire and the corona-resistant time based on a plurality of corresponding relationships between different temperatures and the corona-resistant time; and calculating the highest use temperature of the enameled wire under the first load voltage based on the function relationship between the temperature of the enameled wire and the corona resistance time. Respectively testing the corona-resistant time of the enameled wire at different temperatures, and solving the highest use temperature of the enameled wire at the voltage by fitting a relation curve of the corona-resistant time and the temperature; the method is easy to operate, high in accuracy and short in testing time, and can be widely applied to corona-resistant materials of different specifications and varieties.

Description

technical field [0001] The invention relates to the technical field of variable frequency motor measurement, in particular to a method, device, computer and storage medium for measuring the operating temperature of a variable frequency motor. Background technique [0002] With the rapid development of electronic technology, variable frequency motors have been widely used in AC variable speed and new energy fields due to their advantages of high energy efficiency and strong controllability. However, the pulse power supply for frequency conversion technology has the characteristics of extremely steep rising edge, fast pulse voltage change speed, high repetition rate, and high frequency. These characteristics cause serious partial discharge on the enameled wire inside the frequency conversion motor, accompanied by loss and heat generation. Increase, wear, mechanical vibration, turn-to-turn breakdown and other phenomena lead to premature failure of the variable frequency motor. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12G01R31/34G01K13/00G06F17/15
CPCG01R31/1272G01R31/34G01K13/00G06F17/15
Inventor 徐乐马红杰张立彦于伟莉李明哲
Owner ZHUHAI GREE ELECTRIC ENTERPRISES
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