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Fault detection and fault location method for rotary rectifier of aviation three-stage synchronous motor

A technology of rotating rectifiers and synchronous motors, which is applied in the fields of instruments, electrical measurement, short-circuit testing, etc., can solve problems such as increasing costs, and achieve the effect of fault diagnosis and location.

Active Publication Date: 2020-04-03
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method needs to change the structure of the motor and increase the cost, especially for the motor whose structure has been determined, this method is no longer applicable

Method used

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  • Fault detection and fault location method for rotary rectifier of aviation three-stage synchronous motor
  • Fault detection and fault location method for rotary rectifier of aviation three-stage synchronous motor
  • Fault detection and fault location method for rotary rectifier of aviation three-stage synchronous motor

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Embodiment Construction

[0040] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0041] The concrete steps that embodiment comprises are as follows:

[0042] (1) For aviation brushless electric excitation synchronous motors (see figure 1 ), collect the stator side voltage and current of the main exciter in real time, and estimate the rotor current of the main exciter through the stator flux linkage (see figure 2 and image 3 ), the estimation formula is as follows:

[0043]

[0044] In the formula:

[0045]

[0046] u eαs , u eβs is the exciter stator voltage; i e alpha s i eβs is the exciter stator current; R es , L es is the stator resistance and inductance of the exciter; M esr is the stator-rotor mutual inductance; θ er is the rotor position; i ear i ebr i ecr is the exciter rotor current;

[0047] (2) Carry out harmonic analysis on the estimated three-phase rotor current to obtain the harmonic distortion rate

[0...

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Abstract

The invention relates to an aviation three-stage synchronous motor rotating rectifier fault detection and fault locating method, which is characterized by judging whether a rotating rectifier has fault through distortion rate residual errors of waveform, and if having fault, judging whether the fault is short circuit or open circuit or upper arm diode or lower arm diode fault through the sum valueof the maximum value and the minimum value of phase current of a three-phase rotor of a main exciter, and thus the method can realize a fault diagnosis and locating function. The beneficial effects are that the method can accurately judge whether the rotating rectifier has fault and can accurate locate which diode has short circuit or open circuit.

Description

technical field [0001] The invention belongs to the field of fault detection of a brushless electric excitation synchronous motor, and relates to a fault detection and fault location method for a rotary rectifier of an aviation three-stage synchronous motor. Background technique [0002] In the aviation brushless electric excitation synchronous motor, the exciter rectifies the output through the rotating rectifier to provide the excitation current for the main generator. Due to the higher speed and temperature, the rotating rectifier is more prone to failure than other parts, so the fault detection of the rotating rectifier is of great significance. Rotary rectifier faults can be divided into two types: short circuit and short circuit. In the case of a short circuit, the current flowing through the diode will increase sharply. If it is not protected, other normal devices will be further damaged; in the case of an open circuit, the excitation current will decrease, the torqu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/52G01R31/54G01R31/56
CPCG01R31/50
Inventor 魏志煌刘卫国庞基张赞焦宁飞王尧孙承浩
Owner NORTHWESTERN POLYTECHNICAL UNIV
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