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AC motor equipment exception signal extraction method

A technology for equipment abnormality and signal extraction, applied in the direction of motor generator testing, etc., can solve problems such as affecting the accuracy of analysis, difficulty in extracting abnormal signals, etc., to achieve the effect of eliminating interference

Active Publication Date: 2007-09-26
SHANGHAI BAOSTEEL IND TECHNOLOGICAL SERVICE
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  • Abstract
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Problems solved by technology

[0004] However, the existing method has the following disadvantages: in the existing operation process, because the main component of the current signal is the 50Hz power frequency signal, and the abnormal signal contained in the current signal is extremely weak compared with it, so in the signal analysis It is very difficult to extract abnormal signals
In short, the 50Hz power frequency signal affects the accuracy of the analysis to a certain extent

Method used

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  • AC motor equipment exception signal extraction method
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  • AC motor equipment exception signal extraction method

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Embodiment Construction

[0022] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0023] Please refer to FIG. 3 and FIG. 4, which show a preferred embodiment of the present invention for extracting abnormal signals. First, the current sensor 401 is used to collect the motor current signal, and the voltage sensor 402 is used to collect the motor voltage signal, and the first step 301 is completed. The follower 403A is connected after the current sensor 401, and the follower 403B is connected after the voltage sensor 402. The input impedance of the follower is high and the output impedance is low, which plays the role of buffering, isolating, and improving the load capacity, and prevents the latter circuit from affecting the front. circuit is affected. An automatic gain control circuit 404A is connected after the follower 403A, and a phase shifter 405 and an automatic gain control circuit 404B are sequentially connected after ...

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Abstract

This invention discloses one alternating motor device abnormal signal extracting method and provides one method to extract device signal to eliminate work frequency signal noise interference, which comprises the following keys: collecting motor current signal and motor voltage signal from the motor; adjusting motor voltage signal or the phase to make them fit; adjusting the motor current signal and the range proportion to equal range value; removing the motor voltage signal from the motor current signal to output abnormal signals.

Description

technical field [0001] The invention relates to a method for analyzing abnormality of equipment, in particular to a method for analyzing abnormality of AC motor equipment. Background technique [0002] In the industrial field, AC motors are a major power source. In actual use, the motor and driving equipment may be in an abnormal working state, so it is necessary to know the working state of the motor at all times and diagnose the motor and its driving equipment. [0003] At present, the industry mainly adopts collecting the motor current and analyzing the abnormal signal of the equipment to grasp the working status of the motor and its driving equipment. The method for extracting abnormal signals in the prior art is shown in FIG. 1. First, a current signal 101 is sampled from a current sensor, and then converted into a digital signal 102 by A / D, and then the digital signal is analyzed and processed 103. For example, the The signal is subjected to FFT spectrum analysis, et...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/34
Inventor 万年红
Owner SHANGHAI BAOSTEEL IND TECHNOLOGICAL SERVICE