High-speed blower stator online fault diagnosis system and method

Abstract

The invention relates to a high-speed blower stator online fault diagnosis system. The system comprises a DSP circuit, an analog signal sampling circuit, a data storage circuit, an interface circuit, a power source conversion circuit and an information display circuit. With errors in a coefficient matrix and an observed quantity considered, the system adopts a recursive total least square algorithm to carry out online identification on three kinds of electrical parameters of the permanent magnet synchronous motor. During fault diagnosis, three kinds of parameters, namely stator resistance, stator inductance and permanent magnet flux linkage during initial operation and braking after the installation of the motor are recorded as normal values for reference; the actual value of the stator resistance in the normal operation process of the motor is continuously calculated, the actual value is compared with a normal reference value, and the state of a stator is detected in real time; and when a fault occurs, an alarm can be given, fault diagnosis is carried out by using an identification resistance value, and turn-to-turn disconnection and turn-to-turn short circuit are distinguished from each other. The system and method do not need an additional sensor, can be directly applied to an existing high-speed blower system so as to perform stator online fault diagnosis, and reduce the development cost of the system.

Description

technical field [0001] The invention relates to the field of electromechanical control, in particular to an online fault diagnosis system for a stator of a high-speed blower. Background technique [0002] Compared with the traditional blower, the magnetic levitation blower adopts the working method of magnetic bearing support and high-speed direct drive, which has the advantages of energy saving, high efficiency, low vibration and noise, convenient installation and maintenance, and no lubricating oil. It is used in sewage treatment, aquaculture, material gas transportation, etc. There are applications in many industries. [0003] The magnetic levitation high-speed blower is directly driven by a high-speed motor, and the speed is adjusted by a frequency converter. The active magnetic levitation bearing system is used to provide non-contact and wear-free suspension support for the internal rotating magnetic levitation bearing through controllable electromagnetic force. In act...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved in the present invention is: aiming at the problem that the existing permanent magnet synchronous motor stator fault diagnosis method relies on various external sensors and cannot specifically distinguish the fault of the stator winding due to the similar fault current characteristic frequency when the motor is running at high speed. A stator online fault diagnosis system based on parameter identification algorithm is proposed, which can monitor the running state of the motor stator by using the sensor of the high-speed blower controller, and can distinguish the open circuit fault and inter-turn open circuit fault of the stator winding

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