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Anomaly assessment device, anomaly assessment method, and anomaly assessment system

An abnormal diagnosis and abnormal technology, applied in the direction of automatic disconnection emergency protection devices, control systems, measuring devices, etc.

Active Publication Date: 2020-06-05
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, motors are often operated in high-pressure environments such as high temperature, high load, corrosion, and wear, so there is a high possibility of sudden failure

Method used

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  • Anomaly assessment device, anomaly assessment method, and anomaly assessment system
  • Anomaly assessment device, anomaly assessment method, and anomaly assessment system
  • Anomaly assessment device, anomaly assessment method, and anomaly assessment system

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Experimental program
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Effect test

Embodiment approach 2

[0062] In Embodiment 2, the current waveform acquired from the data acquisition unit 100 in Embodiment 1 is coordinate-converted to perform frequency analysis as d-axis current and q-axis current in the dq-axis coordinate system.

[0063] Figure 13 It is a schematic configuration diagram of the dq axis analysis unit. The dq axis analysis unit 1500 includes a dq axis coordinate conversion unit 1501 , a dq axis current frequency analysis unit 1502 , a dq axis current spectrum averaging unit 1503 , a dq axis sideband wave extraction unit 1504 , and a dq axis spectrum intensity calculation unit 1505 . Here, the d-axis represents the direction of the magnetic flux of the motor 3, and the q-axis represents the direction perpendicular to the d-axis. The d-axis current is a magnetic flux component current, and the q-axis current is a torque component current. Figure 14 is a graph showing the q-axis spectrum waveform of the motor. The vertical axis represents spectral intensity, a...

Embodiment approach 3

[0067] refer to Figure 15 An abnormality diagnosis system according to Embodiment 3 for carrying out the invention will be described. Figure 15 It is a schematic configuration diagram showing an example of an abnormality diagnosis system. In this embodiment, the same reference numerals as those described in Embodiment 1 represent the same or corresponding parts. The abnormality diagnosis system 500 has an abnormality diagnosis device 200 , a monitoring device 300 , and a power conversion device 400 .

[0068] In Embodiment 1, an example was shown in which the abnormality diagnosis device 10 connected to the motor 3 acquires data, processes them, and outputs a display and an alarm when the abnormality is diagnosed. The power conversion device 400 connected to the motor 3 reads data, and the abnormality diagnosis device 200 acquires the read data to diagnose the presence or absence of an abnormality. Based on the diagnosis result, the monitoring device 300 outputs a display ...

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Abstract

The purpose of the present invention is to provide an anomaly assessment device, an anomaly assessment method, and an anomaly assessment system that are capable of assessing whether there is an anomaly even in an electric motor driven by a power conversion device. The anomaly assessment device is provided with: a data acquisition unit that acquires the drive frequency and the electric current waveform of the electric motor; an operation pattern storage unit that stores a combination of the drive frequency and the electric current value of the electric current waveform, which are acquired at the same time by the data acquisition unit; a data determination unit that determines whether the drive frequency and the electric current value of the electric current waveform, which are acquired by the data acquisition unit at the same time in an object to be assessed, match the combination stored in the operation pattern storage unit; an analysis unit that extracts a side band by frequency-analyzing the electric current waveform determined to match the combination by the data determination unit, and calculates the spectral intensity of the side band; and an anomaly assessment unit that assesses that an anomaly is present when the spectral intensity of the side band is equal to or higher than a threshold value.

Description

technical field [0001] The present invention relates to abnormality diagnosis of a motor driven by a power conversion device. Background technique [0002] Electric motors are key components that drive production line equipment and mechanical equipment in industrial factories, and require constant and stable operation continuity. However, motors are often operated in high-pressure environments such as high temperature, high load, corrosion, and wear, so there is a high possibility of sudden failure. In order to avoid such sudden failures, continuous monitoring techniques of electric motors are strongly desired. In recent years, as this continuous monitoring technology, an abnormality diagnosis device for diagnosing an abnormality of a motor by measuring a current loaded on the motor has been developed. For example, in Patent Document 1, in a motor driven by a commercial power supply, the load current is measured and frequency analyzed, and the abnormal The presence or abs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/34H02H7/08H02P29/024
CPCH02H7/08H02P29/024G01R31/343G01R23/16H02H3/52H02P29/0241H02P29/027
Inventor 金丸诚大久保拓哉佐野壮太佐竹彰寺岛觉
Owner MITSUBISHI ELECTRIC CORP