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A motor fault diagnosis system and method based on current and phase identification

A fault diagnosis system and phase identification technology, applied in the direction of motor generator testing, measuring electricity, measuring electrical variables, etc., can solve the problem of reducing judgment reliability, robustness and suppressing interference, misjudgment and failure, and stall current drift. and other problems, to ensure the effectiveness of comparison, high accuracy, and improve reliability.

Active Publication Date: 2022-06-24
爱科赛智能科技(浙江)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The scheme mainly has the following problems: first, the aging of the motor and the difference in the working environment lead to the drift of the locked rotor current; Judgmental reliability, robustness, and ability to reject disturbances

Method used

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  • A motor fault diagnosis system and method based on current and phase identification
  • A motor fault diagnosis system and method based on current and phase identification
  • A motor fault diagnosis system and method based on current and phase identification

Examples

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Embodiment

[0043] Example: Figure 4 Shown is the T-shaped equivalent circuit diagram of the AC motor, and the relevant parameters in the figure are explained as follows: is the stator copper loss resistance, is the stator leakage flux reactance, is the iron loss resistance, main flux reactance, is the converted rotor copper loss resistance, is the converted rotor leakage flux reactance, is the slip rate, The mechanical load on the rotor shaft is converted to the resistance in the circuit, Enter the voltage vector for the motor stator, Enter the current vector for the motor stator, is the motor back EMF vector.

[0044] On the one hand, when the motor starts normally, it accelerates from a standstill until it reaches a stable speed . Correspondingly, its slip rate 1 from standstill, gradually decreasing until stable slip is reached . and relationship is . in: is the synchronous speed of the motor. Depend on Figure 4 It can be seen that during normal...

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PUM

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Abstract

The invention discloses a motor fault diagnosis system and method based on current and phase identification. The system includes an isolated voltage transformer VT, a voltage signal conditioning circuit, an isolated current transformer CT, a sampling resistor R, a current signal conditioning circuit and a main control chip; the method detects whether the AC motor starts to be blocked by judging the phase relationship between the voltage and current in the starting phase change. When a stall occurs during the running phase, the motor slip rate changes approximately from a stable value to 1 step by step. At this time, the motor current increases sharply and the phase between voltage and current jumps rapidly to a new phase value. Therefore, the present invention can quickly and accurately diagnose whether the motor is stalled or not by detecting the relationship between the motor current and the phase and time of the voltage and current, and improve the safety of the operation of the AC motor.

Description

technical field [0001] The invention relates to the field of AC motor fault handling, in particular to a motor fault diagnosis system and method based on current and phase identification. Background technique [0002] As a power source, motors are widely used in all walks of life, such as various machine tools, electric vehicles, high-speed rail locomotives, factory power equipment, water supply and drainage equipment, elevators, electric fans, air conditioners, etc. Due to the complex working conditions of the motor application and the imperfect protection measures, the rotor of the motor is often blocked, for example, the transmission mechanism on the rotor of the motor is locked, or the speed change gear is blocked due to foreign objects or failures, and the elevator drive chain is stuck. Dead, the belt of the conveyor is stuck, the fluid medium of the pump is frozen or the sediment is blocked, etc. Once the locked rotor occurs, the current of the motor rises sharply, wh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/34G06F17/14
CPCG01R31/343G06F17/14
Inventor 彭志辉李峰平黄继宝冮建华黄波
Owner 爱科赛智能科技(浙江)有限公司
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