Patent · US Active

Diagnostic system for unbalanced motor shafts for high speed compressor

US8771891B2 · kind B2 · utility

0Cited by

7References

2Claims

0Family size

Assignee

GM GLOBAL TECHNOLOGY OPERATIONS LLC · US

Inventors

Oliver Maier · Worms, DE
Bernd Peter Elgas · Gau-Algesheim, DE
Ulrich Dumke · Gerolzhofen, DE
Peter Willimowski · Darmstadt, DE

Key dates

Filing date	Aug 15, 2006
Grant date	Jul 8, 2014
Priority date	—
Expiry date	Jan 10, 2031

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P70/50
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A diagnostic system for determining whether a rotor shaft of a compressor is unbalanced. The compressor includes a displacement sensor that measures the displacement of the rotor shaft as it is rotating. The sensor dynamic frequency signal is sent to a bandpass filter that filters out an eigen-frequency frequency that is a function of shaft elasticity and rotor dynamics. The filtered frequency signal is then rectified by a rectifier to make the filtered frequency signal positive. The rectified signal is then passed through a low pass filter that converts the rectified signal to a DC signal. The DC signal is then sent to a controller that determines if the amplitude of the signal is above a predetermined threshold, which indicates a problem with the balance of the compressor.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.