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Determination method for power frequency operating electrical parameters of three-phase asynchronous motor

A three-phase asynchronous, method-determined technology, applied in the direction of motor generator testing, measuring electricity, measuring electrical variables, etc., can solve problems such as quantitative calculations and non-linear relationships that cannot be explained, so as to reduce computational complexity and improve accuracy , The effect of ensuring accuracy

Active Publication Date: 2019-11-01
WEIFANG UNIVERSITY
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Problems solved by technology

The literature (Zeng Lingquan. Electric Motor Science [M], second edition, China Electric Power Press, 2014) qualitatively pointed out that the rated load rate of three-phase asynchronous motors has a nonlinear relationship with the power factor, but it did not explain the specific nonlinear relationship. Quantitative calculation based on this

Method used

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  • Determination method for power frequency operating electrical parameters of three-phase asynchronous motor
  • Determination method for power frequency operating electrical parameters of three-phase asynchronous motor
  • Determination method for power frequency operating electrical parameters of three-phase asynchronous motor

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Experimental program
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Embodiment

[0028] Embodiment: Randomly select 4 three-phase asynchronous motors in an industrial park to measure and analyze the actual operation data on the spot (the field measurement data is shown in Table 7), to verify the feasibility and effectiveness of the method proposed by the present invention.

[0029] Table 1 shows the measured data of the power frequency operation electrical parameters of the No. 1 motor in the industrial park under different load rates.

[0030] Table 1 The measured data of motor No. 1 in the industrial park

[0031]

[0032] The data in Table 1 were fitted using the least square method 4th degree polynomial fitting, and the fitting curve was obtained in the appendix figure 1 , the fitted function expression is:

[0033]

[0034] Where: P 1 Indicates the active power of motor No. 1, I 1 Indicates one-phase current of No. 1 motor. According to formula (5), the corresponding active power and power factor electrical parameters are calculated by using t...

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Abstract

The invention discloses a determination method for power frequency operating electrical parameters of a three-phase asynchronous motor. The method comprises the steps of measuring a one-phase currentvalue I of a three-phase asynchronous motor and the value of active power P corresponding to the current value I under a plurality of different load rate groups; building a function of the active power P using the current value I as an independent variable, and determining a specific value of the parameter by using a least squares polynomial fitting mode. According to the function relation betweenthe acquired current value I and the corresponding active power P, the corresponding active power P can be acquired and a power factor can be determined by only measuring the one-phase current valueI of the three-phase asynchronous motor under any load rate. The determination method has the beneficial effect that the power frequency operating electrical parameters such as the active power and the power factor under the same condition can be acquired by only measuring the one-phase current value of the three-phase asynchronous motor; compared with the traditional measurement mode, the determination method is simple to operate and low in cost.

Description

technical field [0001] The invention belongs to the technical field of motors, and relates to a method for determining electrical parameters of a three-phase asynchronous motor operating at power frequency. Background technique [0002] my country's industrial enterprises consume a huge amount of electricity. According to data released by the National Energy Administration, industrial electricity consumption in 2018 reached 4,645.6 billion kwh. In industrial enterprises, three-phase asynchronous motors are the electrical equipment with the largest power consumption, and most of them operate at power frequency. Therefore, real-time monitoring of the active power, power factor, three-phase voltage, Current and other parameters, to achieve power energy analysis and production scheduling, to achieve power saving has significant economic benefits. More and more companies have begun to establish a digital energy supervision platform to realize online measurement and intelligent s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/34
CPCG01R31/343
Inventor 季涛张雪原林凯
Owner WEIFANG UNIVERSITY
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