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Method for detecting a rotating stall fault in a compressor fed by an inverter

A rotating stall and compressor technology, applied in the direction of machines/engines, mechanical equipment, non-variable pumps, etc., can solve the problems of reducing strength and shortening the duration of surge

Active Publication Date: 2010-07-21
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent specification provides a method of operating an inverter-fed compressor that significantly reduces the duration and magnitude of the surge

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  • Method for detecting a rotating stall fault in a compressor fed by an inverter
  • Method for detecting a rotating stall fault in a compressor fed by an inverter
  • Method for detecting a rotating stall fault in a compressor fed by an inverter

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Embodiment Construction

[0014] exist figure 1 Among them, 2 represents a device for implementing the method of the present invention, 4 represents a load-side converter, 6 represents a field-oriented control device, 8 represents a three-phase AC motor, and 10 represents a device for detecting a and rotating speed The means for proportionalizing the signal ω, 12 denotes a compressor. The three-phase AC motor 8 is connected on its stator side to the output of a load-side converter 4 , which is also called an “inverter”. A compressor 12 and a device 10 for detecting a signal ω proportional to the rotational speed are mechanically connected to the rotor of the three-phase AC motor 8 . The load-side converter 4 is a component of a voltage source converter. The load-side converter 4 is connected to a voltage source DC link circuit through its DC voltage side, and a grid-side converter is also connected to the voltage source DC link circuit through its DC voltage side. For clarity, the voltage source con...

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Abstract

The invention relates to a method for detecting a rotating stall fault in a compressor (12) which is driven by means of a three-phase current motor (8) fed by an inverter. According to the invention, an instantaneous estimated value (m ) which is calculated from measured power converter output currents (iS1, iS2, iS3) and a measured rotational-speed-proportional signal (Omega) is compared with aninstantaneous setpoint value (m*) determined from a measured rotational-speed-proportional signal (Omega,Omega*) and a predetermined rotational-speed-proportional signal (Omega*), in such a way that in the case of inequality a signal (SRS) is generated which indicates that the rotating stall fault has occurred. In this way, it is possible for the rotating stall fault to be detected without pressure sensors and / or oscillation pickups in a compressor (12) which is driven with a three-phase current motor (8) fed by inverter.

Description

technical field [0001] The present invention relates to a method of identifying "rotating stall" faults in a compressor driven by an inverter-fed three-phase AC motor. Background technique [0002] The following faults may occur during the operation of the compressor, namely "Surge", "Stall" and "Rotating Stall". J.M.Sorokes published the article "Rotating Stall-An Overview of Dresser-Rand-Experience" (Rotating Stall-An Overview of Dresser-Rand-Experience) through Dresser-Rand Company, Houston, Texas in February 2003. Before the "stall" fault, a brief description of the above-mentioned faults is given. [0003] "Spinning stall" failures often precede "surge" failures. Both types of faults are acceptable to a certain extent, but because of the vibration phenomenon in the "rotating stall" fault, the "rotating stall" fault will cause material fatigue. To date, detection of "rotating stall" faults has only been carried out in large compressors by means of pressure sensors and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D27/02
CPCF04D27/0261F04D27/0292F04D27/001F05D2270/335Y02B30/70F04D25/06
Inventor 阿克塞尔·默滕斯格哈德·内泽尔
Owner SIEMENS AG