Device and method for monitoring rotating motor

Abstract

The invention provides a rotating motor monitoring device, which is used for monitoring a rotating motor coved by a light-tight shell, and comprises: an observation window which is partially embedded in the shell and is light permeable but light-tight; a camera which is configured at the outer side of the observation window, receives radiant light generated on the inner side or transmitted by the observation window and generates image data; and an arithmetic device which is used for processing image data. The arithmetic device is provided with a reference image data storage unit for saving the image data of black-body radiation in a reference state in the shell as referent image data, and a temperature computing unit for computing the temperature of the inside of the shell by comparing the image data and the reference image data.

Description

technical field [0001] The present invention relates to a device and method for monitoring the temperature and the like in a housing of a rotating electrical machine covered with a housing that does not transmit light. Background technique [0002] Conventionally, as a method of monitoring abnormality in the temperature of a coil of a rotating electrical machine such as a motor, a method of estimating the temperature from the resistance value of the coil is known. In addition, a method of measuring temperature by installing a sensor such as a resistance temperature detector or a thermocouple near the coil is also known. [0003] In addition, for diagnosing the state of insulation of a stator of a rotating electric machine, the magnitude and frequency of partial discharge pulses generated on the stator are evaluated. Therefore, a method of detecting a partial discharge signal through a specific single-phase electrostatic coupling and a method of detecting a signal of a pulsa...

AI Technical Summary

Problems solved by technology

[0009] In the method of estimating temperature from the resistance value of the coil, although the average temperature of the entire coil can be estimated, local temperature rise cannot be detected

[0010] In addition, according to the method of measuring temperature by installing a sensor such as a resistance temperature detector or a thermocouple near the coil, although a local temperature can be detected, the temperature measurement position is limited to a specific point, so the abnormally high temperature may occur in other positions. It is not possible to detect the condition

In order to increase the temperature measurement position, the number of sensors is required, and there is a problem of cost increase

[0011] In addition, in the method of detecting a partial discharge signal through a specific single-phase electrostatic coupling of the stator, or the method of detecting a pulse current signal through a high-frequency converter, the influence of external noise is large, and real-time monitoring is difficult.

[0012] In addition, in the method of extracting the gas in the casing of the rotating electric machine and analyzing it with a macroscopic analysis device, it is difficult to perform real-time monitoring.

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