Fault detection for bearings
First Claim
1. A fault detection system for predicting bearing failure, in a system having an electric machine with a bearing-supported shaft, the fault detection system comprising:
- a position sensor configured to sense positions of the shaft as the shaft rotates; and
a controller configured to;
receive position data from the position sensor, the position data indicating a plurality of sensed positions of the shaft;
determine at least one of a position profile and a velocity profile over time for the shaft, based upon the received position data;
determine a frequency profile for the at least one of the position profile and the velocity profile;
identify a frequency peak in the frequency profile including identifying a frequency band in the frequency profile; and
identify an expected bearing failure based upon;
at least one of comparing the frequency peak with one or more solutions to a characteristic failure frequency equation for a bearing supporting the shaft, and comparing the frequency peak with one or more predetermined failure mode frequencies;
determining that the frequency peak exhibits an amplitude exceeding a predetermined failure mode amplitude; and
determining that the frequency peak is within the frequency band.
1 Assignment
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Accused Products
Abstract
A fault detection system is disclosed for predicting bearing failure in a system with a bearing-supported shaft. A position sensor may sense a position of the shaft as the shaft rotates. A controller may receive, from the position sensor, position data indicating a plurality of sensed positions of the shaft. The controller may determine a position or velocity profile for the shaft based upon the received position data and may determine a frequency profile based upon the position or velocity profile. The controller may identify a characteristic of the frequency profile, and identify an expected bearing failure based upon the identified characteristic.
7 Citations
16 Claims
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1. A fault detection system for predicting bearing failure, in a system having an electric machine with a bearing-supported shaft, the fault detection system comprising:
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a position sensor configured to sense positions of the shaft as the shaft rotates; and a controller configured to; receive position data from the position sensor, the position data indicating a plurality of sensed positions of the shaft; determine at least one of a position profile and a velocity profile over time for the shaft, based upon the received position data; determine a frequency profile for the at least one of the position profile and the velocity profile; identify a frequency peak in the frequency profile including identifying a frequency band in the frequency profile; and identify an expected bearing failure based upon; at least one of comparing the frequency peak with one or more solutions to a characteristic failure frequency equation for a bearing supporting the shaft, and comparing the frequency peak with one or more predetermined failure mode frequencies; determining that the frequency peak exhibits an amplitude exceeding a predetermined failure mode amplitude; and determining that the frequency peak is within the frequency band. - View Dependent Claims (2)
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3. A fault detection system for predicting bearing failure, in a system having a bearing-supported shaft, the fault detection system comprising:
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a position sensor configured to sense positions of the shaft as the shaft rotates; and a controller configured to; receive position data from the position sensor, the position data indicating a plurality of sensed positions of the shaft; determine at least one of a position profile and a velocity profile over time for the shaft, based upon the received position data; determine a frequency profile for at least one of the position profile and the velocity profile; identify a frequency peak in the frequency profile and one or more characteristics of the frequency profile across a frequency band; and identify an expected bearing failure based upon the identified frequency peak and the one or more characteristics of the frequency profile across the frequency band. - View Dependent Claims (4, 5, 6, 7, 8)
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9. A fault detection system for predicting bearing failure, in a system having a bearing-supported shaft, the fault detection system comprising:
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a position sensor configured to sense positions of the shaft as the shaft rotates; and a controller configured to; receive position data from the position sensor, the position data indicating a plurality of sensed positions of the shaft; determine a frequency profile based upon the received position data; identify a first characteristic of the frequency profile across a frequency band of the frequency profile; and identify an expected bearing failure based upon the identified first characteristic within the frequency band. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification