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Asynchronous motor fault detection method based on observer

A technology for fault detection of asynchronous motors, applied in the control of generators, motor control, motor generator control, etc., can solve problems such as insufficient timeliness of fault detection, reduce maintenance time and costs, reduce unexpected changes, and prevent aggravation Effect

Inactive Publication Date: 2020-12-15
DALIAN MARITIME UNIVERSITY
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  • Application Information

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Problems solved by technology

[0003] At this stage, the asynchronous motor fault we want to study can be detected by comparing the observed value of the sliding mode observer with the actual value, but the fault can only be detected after the fault occurs about 0.1s, which has a certain lack of timeliness for fault detection

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  • Asynchronous motor fault detection method based on observer
  • Asynchronous motor fault detection method based on observer
  • Asynchronous motor fault detection method based on observer

Examples

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Embodiment 1

[0061] 1. When the asynchronous motor is running normally, the error curve between the actual value and the observed value of the rotor current (here, irq is used to illustrate) is as follows figure 2 . It can be seen from the error curve that the error value curve is close to 0, indicating that the asynchronous motor is in a normal working state.

[0062] 2. When a short-circuit fault occurs between turns of the stator winding of an asynchronous motor, the error curve between the actual value and the observed value of the rotor current (here irq is used for illustration) is as follows: image 3 . When the fault is added at 0.5s, it can be seen from the error curve of the actual value of the rotor current and the observed value that the curve is stable near 0, and the curve fluctuates at 0.5s, so it can be seen that the asynchronous motor has a fault at 0.5s , so that the fault detection of the asynchronous motor is realized by the sliding mode observer.

[0063] 3. When t...

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Abstract

The invention provides an asynchronous motor fault detection method based on an observer, and the method comprises the following steps: simplifying a mathematic model of an asynchronous motor throughcoordinate transformation, giving the mathematic model of the asynchronous motor under a static two-phase and rotating orthogonal coordinate system, and giving an asynchronous motor model after statorvoltage orientation; detecting the fault of the asynchronous motor; building a vector control asynchronous motor simulation model through MATALN / SIMULINK, wherein the the vector control asynchronousmotor simulation model comprises a power supply module, an inversion part, a vector control module and an asynchronous motor. and carrying out residual error comparison on a rotor current observationvalue output by the sliding mode observer and an actual value, so that fault detection of the system is realized. According to the method, whether the motor breaks down or not can be detected as soonas possible through comparison of the observed value and the actual value of the sliding mode observer, further aggravation of the fault can be prevented, and the maintenance time and cost of the motor fault are reduced.

Description

technical field [0001] The invention relates to the technical field of motor fault detection, in particular to an observer-based asynchronous motor fault detection method. Background technique [0002] The failure of the stator winding and the rotor winding is one of the main reasons for the failure of the induction motor. Real-time monitoring of the motor operation status can not only improve the reliability of the motor operation, but also avoid unnecessary economic losses. Therefore, timely and effectively detect the induction motor winding Failure is entirely necessary. Firstly, the fault characteristics of the induction motor stator winding and rotor winding are analyzed, and the fault modeling is carried out. Then, a robust observer design method is proposed by using the state space mathematical model of the d-q coordinate system of the induction motor. The method not only has good robustness to unknown input disturbance, but also has high sensitivity to winding fault...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/13H02P21/14H02P21/00H02P29/024
CPCH02P21/0007H02P21/13H02P21/14H02P29/024
Inventor 付友朱瑜
Owner DALIAN MARITIME UNIVERSITY
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