System and method for detecting fault in an AC machine
First Claim
1. A controller configured to detect a rotor fault condition, the controller having a processor programmed to:
- receive voltage and current data from an AC induction machine;
generate a current frequency spectrum from the current data;
identify rotor-fault related harmonics in the current frequency spectrum;
calculate a fault severity indicator using the voltage and current data, identified rotor-fault related harmonics, and motor specifications;
analyze the fault severity indicator to determine a possibility of rotor fault; and
generate an alert based on the possibility of rotor fault.
2 Assignments
0 Petitions
Accused Products
Abstract
A system and method for detecting a rotor fault condition in an AC induction machine is disclosed. The system includes a processor programmed to receive voltage and current data from an AC induction machine, generate a current frequency spectrum from the current data, and identify rotor-fault related harmonics in the current frequency spectrum. The processor is also programmed to calculate a fault severity indicator using the voltage and current data, identified rotor-fault related harmonics, and motor specifications, analyze the fault severity indicator to determine a possibility of rotor fault. The processor generates an alert based on the possibility of rotor fault.
-
Citations
20 Claims
-
1. A controller configured to detect a rotor fault condition, the controller having a processor programmed to:
-
receive voltage and current data from an AC induction machine; generate a current frequency spectrum from the current data; identify rotor-fault related harmonics in the current frequency spectrum; calculate a fault severity indicator using the voltage and current data, identified rotor-fault related harmonics, and motor specifications; analyze the fault severity indicator to determine a possibility of rotor fault; and generate an alert based on the possibility of rotor fault. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A method of detecting a rotor fault in an induction machine, the method comprising:
-
accessing current and voltage data during operation of an AC induction machine; performing a frequency spectrum analysis on the current data to generate a current frequency spectrum; generating a plurality of fault index samples from the current frequency spectrum over a period of operation of the AC induction machine; determining a rotor fault probability based on the plurality of fault index samples; and outputting a rotor fault indicator based on the determined rotor fault probability. - View Dependent Claims (11, 12, 13, 14, 15, 16)
-
-
17. A computer readable storage medium having stored thereon a computer program comprising instructions which, when executed by at least one processor, cause the at least one processor to:
-
receive a plurality of voltage and current measurements from a sensor system coupled to an AC induction motor; analyze the plurality of current measurements to identify rotor fault harmonics therein; calculate a plurality of fault severity indices based on the rotor fault harmonics; define a fault severity indicator from the plurality of fault severity indices; compare the fault severity indicator to a predetermined fault severity threshold; and output a fault possibility based on the comparison of the fault severity indicator to the predetermined fault severity threshold. - View Dependent Claims (18, 19, 20)
-
Specification