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Electric motor diagnosis device

A technology for diagnosing devices and motors, which is used in motor generator testing, AC motor control, measuring devices, etc., can solve the problems of large number of wirings and unrealistic application.

Active Publication Date: 2017-09-12
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, applying the above premise to a motor control center that centrally manages hundreds to thousands of motors will lead to a large number of wiring, so the application is not realistic.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0033] Below, based on Figure 1 to Figure 7 The motor diagnostic device according to Embodiment 1 of the present invention will be described.

[0034] figure 1 It is a circuit diagram showing the configuration of the motor diagnostic device according to Embodiment 1 of the present invention, and is mainly used as a control center of an enclosed switchboard.

[0035] exist figure 1 In the main circuit 1 of the power source introduced from the power system, a circuit breaker 2 for wiring, an electromagnetic contactor 3, an instrument converter 4 for detecting the load current of the main circuit 1, and a circuit breaker for detecting the voltage of the main circuit 1 are provided. A transformer 5 for instrumentation is connected to a motor 6 as a load, and the motor 6 operates to drive a mechanical device 7 .

[0036] The motor diagnosis device 100 includes: a voltage detection circuit 8 connected to the meter transformer 5, a current detection circuit 9 connected to the met...

Embodiment approach 2

[0092] Next, based on Figure 8 A motor diagnostic device according to Embodiment 2 of the present invention will be described.

[0093] Figure 8 The flow chart showing the diagnostic processing of the second embodiment is the same as that of the first embodiment from step S1 to step S7, and thus description thereof will be omitted.

[0094] exist Figure 8 In step S8, the increase amount of the negative phase current Isn relative to the normal phase current Isp is compared with the threshold value δ2. In step S8, when the amount of increase of the negative phase current Isn relative to the normal phase current Isp is smaller than the threshold value δ2 (Yes), proceed to step S9.

[0095] In step S9, the evaluation value A=|Isn−Yn*Vsn| is compared with the threshold value δ1. When the evaluation value A is equal to or greater than the threshold value δ1 (Yes), it is determined that the winding is short-circuited, and when the evaluation value A is smaller than the thresho...

Embodiment approach 3

[0099] Next, a diagnosis device for a motor according to Embodiment 3 of the present invention will be described.

[0100] In Embodiments 1 and 2, one logic operation unit 10 is provided for each motor 6 , but in Embodiment 3, voltage and current signals are analyzed by one logic operation unit 10 for a plurality of motors to determine abnormality.

[0101] As a disadvantage of Embodiment 1, in the initial normal value storage, an abnormal value is stored for the first time in the case of a motor that has already failed. Therefore, by collectively processing the information of a plurality of motors, for example, in the case of the same motor, it is possible to determine whether it is normal or abnormal in the initial determination.

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PUM

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Abstract

Short-circuit diagnosis devices for electric motor stator windings have had a problem wherein because calculation parameters are influenced by load torque fluctuation, power imbalance, and contact failure, it is difficult to correctly and highly accurately detect a winding short-circuit. The present invention is provided with a logical operation unit (10) that receives the output of a current detection circuit (9) for detecting the current of an electric motor (6) and a voltage detection circuit (8) for detecting the voltage of the electric motor (6) and a display unit (13) and external output unit (15) for respectively providing an abnormality indication and external notification when the logical operation unit (10) detects an abnormality in the electric motor. Through voltage and current analysis of the electric motor, the logical operation unit (10) distinguishes power supply imbalance and identifies and detects a winding short circuit on the basis of reverse-phase current, reverse-phase voltage, positive-phase current, and reverse phase admittance even if a load torque varies while the electric motor is operating.

Description

technical field [0001] The present invention relates to a motor diagnostic device that monitors the state of a motor and protects the motor against an abnormal state. Background technique [0002] There are many motors in the factory, and the diagnosis of the equipment is judged by the maintenance department through the diagnosis of five senses. Especially for motors with high importance, the cost is high due to the need for periodic diagnosis. In addition, in the electric motor, when deterioration starts, the deterioration progresses rapidly. In the case of AC motors, gaps and damaged parts of the insulation caused by mechanical stress and thermal deterioration may cause layer shorts (layer shorts) due to discharge, etc., and sometimes cause sudden insulation breakdown. Therefore, once the motor If deterioration occurs, it will only advance the state of progress of deterioration. [0003] Therefore, interest in constant monitoring technology of electric motors is increas...

Claims

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Application Information

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IPC IPC(8): G01R31/34G01R31/02H02P23/00
CPCH02P23/00G01R31/343G01R29/16G01R31/346
Inventor 宫内俊彦金丸诚森贡月间满
Owner MITSUBISHI ELECTRIC CORP
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