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Method and device for monitoring bearing failure of power generator

A generator bearing and fault monitoring technology, applied in the direction of mechanical bearing testing, etc., can solve the problems of difficult measurement, unsatisfactory effect, and inability to accurately reflect the bearing operation status, and achieve the effect of accurate, effective and monitoring.

Active Publication Date: 2012-05-30
SHANGHAI DONGHAO TEST TECH
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Problems solved by technology

However, although wind turbines are rotating machinery, their low-speed and heavy-load characteristics are significantly different from ordinary rotating machinery. Vibration and shock are no longer the main characteristics of their operating failures. Therefore, acceleration and speed sensors are used to detect It is very difficult to measure and analyze bearing faults, and the results are not ideal, or the monitoring results cannot accurately reflect the operating conditions of the bearings

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  • Method and device for monitoring bearing failure of power generator
  • Method and device for monitoring bearing failure of power generator
  • Method and device for monitoring bearing failure of power generator

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Embodiment Construction

[0020] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0021] Generally speaking, for generators, such as wind turbines, the position (radial and axial) between the stator and the rotor is fixed by bearings. The generator speed is low and the mass of the rotor is large, so low speed and heavy load are the main factors. Operating characteristics, this operating characteristic determines that the characteristics of vibration and shock signals must be insensitive, while the displacement signal, that is, the relative position change between the rotor and the stator, is the most sensitive and direct characteristic parameter.

[0022] The present invention uses an eddy current sensor to measure the relative position between the rotor and the stator, and the eddy current sensor outputs two parameters of dynamic voltage and static voltage, and the dynamic voltage represents the position caused by pitting a...

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Abstract

The invention relates to a method for monitoring bearing failure of a power generator. The method comprises providing a power generator including a rotor and a stator; installing a measuring member on one of the rotor and stator while installing an eddy current sensor on the other, with the measuring member and the eddy current sensor opposite to each other during rotor rotation process; allowing the eddy current sensor to generate different eddy current output signals according to its distance with the measuring member; and monitoring position relation between the rotor and stator according to the output signals so as to determine running state of the bearing. The invention also provides a monitoring device for realizing the above method. The invention can effectively and precisely monitor running state of the bearing of the power generator.

Description

【Technical field】 [0001] The invention relates to a method and device for monitoring faults of generator bearings. 【Background technique】 [0002] The generator is composed of stator, rotor, bearing and other main components. It is a rotating mechanical equipment. The bearing (especially the front bearing) is a vulnerable part. It is necessary to use certain monitoring methods to grasp the state of the bearing during operation, so as to ensure the generator set. safe operation. [0003] At present, the industry generally adopts the vibration measurement method of the acceleration (or speed) sensor commonly used in ordinary rotating machinery to identify the bearing fault of the wind turbine. However, although wind turbines are rotating machinery, their low-speed and heavy-load characteristics are significantly different from ordinary rotating machinery. Vibration and shock are no longer the main characteristics of their operating failures. Therefore, acceleration and speed ...

Claims

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Application Information

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IPC IPC(8): G01M13/04
Inventor 王忠实
Owner SHANGHAI DONGHAO TEST TECH
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