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Coordinate parameter correction method applied to motor diagnosis process

A technology of parameter correction and coordinates, applied in the direction of motor generator testing, measuring electricity, measuring electrical variables, etc., can solve problems such as inaccurate evaluation results and inconsistency of different loads, and achieve continuous and high-accuracy diagnostic results

Pending Publication Date: 2021-08-03
XIAN TECH UNIV
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for correcting coordinate parameters in the process of motor diagnosis, which solves the problem that the traditional motor fault diagnosis method has inaccurate evaluation results at different powers and inconsistent problems at different loads

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  • Coordinate parameter correction method applied to motor diagnosis process

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Embodiment

[0022] The invention discloses a method for correcting coordinate parameters in the process of motor diagnosis. The method forms a new excitation function, and the calculation flow of its calibration standard parameters is as follows: figure 1 As shown, it specifically includes the following steps:

[0023] Step 1: Using the collected three-phase current signals, perform FFT transformation on each of the three phases, and extract the value I of the amplitude of the fundamental wave parameters a , I b and I c , in this example, I a , I b and I c The maximum value of the three values ​​is 6000, which is not equal to the actual current value, but the value basically satisfies a linear relationship with the actual current value;

[0024] Step 2: According to the set current sensor range, convert the corresponding actual current situation, that is, calculate the real current situation; take the 100A range as the minimum sensor range, assuming that the actual test range is A. I...

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Abstract

The invention relates to a coordinate parameter correction method applied to a motor diagnosis process. The method specifically comprises the following steps of: 1, carrying out FFT conversion on three phases through collected three-phase current signals, and extracting the values Ia, Ib and Ic of fundamental wave parameter amplitudes; 2, converting corresponding actual current conditions Iam, Ibm and Icm according to a set current sensor measuring range; 3, according to the Iam, Ibm and Icm, solving an average value I av, and meanwhile solving the maximum value Im in the Iam, Ibm and Icm ; 4, solving an average value Iv of the average value Iav and the maximum value Im; 5, performing section division by taking the Iam, Ibm, Icm and Iv as data sources of division sections; 6, dividing and calculating coordinate parameters of the Iam, the Ibm, the Icm and the Iv according to the sections; and 7, obtaining four coordinate reference parameters used as motor fault diagnosis evaluation standards. With the method provided by the invention adopted, the problem that a traditional motor fault diagnosis method is inaccurate in evaluation result at different powers and is not uniform at different loads can be solved.

Description

technical field [0001] The invention relates to the field of detection and diagnosis of electrical equipment, in particular to a method for correcting coordinate parameters in the process of motor diagnosis. Background technique [0002] Motors are widely used as basic end effectors in industrial production and people's daily life. Due to its large number and important status, whether it can operate normally and stably has become a major concern. [0003] At present, my country considers the high cost of downtime, long maintenance cycle and large impact on large-scale high-voltage motors. When leaving the factory, some temperature and vibration sensors are generally preset or pre-buried inside the motor, so as to realize online detection of the motor during operation. The purpose of real-time analysis of motor operating conditions is to monitor the heating and vibration conditions. For large motors, this method can only estimate the local temperature state of the motor, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/34
CPCG01R31/343
Inventor 高雅朱秦岭孙晋坤李波李小鹏
Owner XIAN TECH UNIV