Electric motor diagnosing device

A diagnostic device and motor technology, applied in the direction of motor generator testing, measuring devices, measuring electricity, etc., can solve the problems of unrealistic application, large number of wiring, etc., and achieve the effect of high-precision short-circuit faults

Pending Publication Date: 2020-11-13
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, applying the above premise to a motor control center that centrally manages hundreds to thousands of motors will result in a large number of wiring, so the application is not realistic

Method used

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  • Electric motor diagnosing device
  • Electric motor diagnosing device
  • Electric motor diagnosing device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0027] Below, refer to Figure 1 to Figure 5 The motor diagnosis device according to Embodiment 1 will be described.

[0028] figure 1 It is a circuit configuration diagram showing the motor diagnosis device according to Embodiment 1, and is mainly used as a control center of an enclosed switchboard. In the figure, a circuit breaker 2 for wiring, an electromagnetic contactor 3 , an instrument converter 4 for detecting a load current of the main circuit 1 , etc. are provided in a main circuit 1 of a power source introduced from a power system. In addition, a motor 5 is connected as a load, and the mechanical device 6 is driven by the motor 5 .

[0029] The motor diagnosis device 100 includes a current detection circuit 7 connected to the meter inverter 4, an arithmetic processing unit 10, a storage device 11, a setting circuit 12, a display unit 13, a drive circuit 14, an external output unit 15, and a communication circuit 16. .

[0030] The current detection circuit 7 con...

Embodiment approach 2

[0081] Below, refer to Figure 6 to Figure 9 A diagnostic device for a motor according to Embodiment 2 will be described.

[0082] Figure 6 It is a circuit configuration diagram showing a diagnostic device for a motor according to Embodiment 2. It is different from Embodiment 1 in that an instrument transformer 8 for detecting the voltage of the main circuit 1 is provided in the main circuit 1 , and an instrument transformer 8 is provided in the motor. The diagnostic device 100 is provided with a voltage detection circuit 9 connected to a meter transformer 8 . Other configurations are the same as those of Embodiment 1.

[0083] The voltage detection circuit 9 detects the line-to-line voltage of the main circuit 1 of the power supply connected to the motor, converts it into a predetermined signal such as the phase voltage of the motor 5 to detect the voltage of the motor, and outputs it to the arithmetic processing unit 10 and the storage device 11 .

[0084] The arithmeti...

Embodiment approach 3

[0112] In Embodiments 1 and 2, the calculation is repeated multiple times (predetermined number of times) and averaged to obtain the initial reverse-phase current value Isn0 before making the winding short-circuit determination. Type and each specification to generate a corresponding table of voltage unbalance rate and reverse current, so as to keep the initial reverse current value Isn0.

[0113] Figure 10 It is a figure which shows the correspondence relationship between the voltage unbalance rate and the reverse current in a tabular form. First, the method of creating this table will be described. Prepare a row for the sequence Vun(n) and a row for the voltage unbalance rate Vunbal. If the preset threshold δ2 for the voltage unbalance rate Vunbal is set to 1%, then the sequence Vun(0), Vun(1), Vun(2), ..., Vun(7), The voltage unbalance rate Vunbal (%) corresponding to Vun(8) and Vun(9) is 0≤Vunbal≤0.1, 0.1

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Abstract

An electric motor diagnosing device is provided with a current detecting circuit (7) for detecting the current of the electric motor (5), and an arithmetic processing unit (10) into which an output ofthe current detecting circuit (7) is input and which determines a winding short circuit failure of the electric motor (5), wherein the arithmetic processing unit (10) includes an operating state determining portion (41) for determining an operating state of the electric motor (5), and an initial negative phase sequence current analyzing portion (31) for analyzing an initial negative phase sequence current in a normal state, and is configured to determine a winding short circuit of the electric motor using a difference from the initial negative phase sequence current of the negative phase sequence current calculated from the current of the electric motor during operation as an evaluation value, and therefore, since a negative phase admittance is not calculated, short circuit failure of a stator winding of the electric motor can be detected with a high degree of accuracy.

Description

technical field [0001] The present application relates to a diagnostic device for electric motors. Background technique [0002] There are multiple motors in the factory, and the diagnosis of the equipment is judged by the maintenance organization through the diagnosis of five senses. For a motor with a particularly high degree of importance, periodic diagnosis is required, which increases the cost. In addition, in electric motors, gaps or damaged parts of the insulators caused by mechanical stress and thermal deterioration may cause interlayer short circuits (layer short) due to discharge or the like, which may cause sudden insulation breakdown. Therefore, once the deterioration of the electric motor starts , will only advance the state of deterioration progress. [0003] Therefore, interest in continuous monitoring techniques for electric motors is increasing. However, the continuous monitoring of electric motors often presupposes the installation of measuring equipment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/34G01R31/72
CPCG01R31/343G01R31/52G01R19/02G01R19/16571G01R31/34G01R19/16566G01R19/003
Inventor 宫内俊彦金丸诚
Owner MITSUBISHI ELECTRIC CORP
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