Methods, systems and apparatus for detecting abnormal...

Details Methods, systems and apparatus for detecting abnormal... Methods, systems and apparatus for detecting abnormal...

2011-07-12

2011-07-12

Nguyen, Ha Tran T (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

Reexamination Certificate

active

07977963

ABSTRACT:
Methods and apparatus are provided for determining whether one or more inverter sub-modules of an inverter module is operating properly. Amplitude of each stator current signal is regularly measured. For each current signal, a positive counter counts a number of consecutive times the amplitude of that current signal is less than a positive current threshold, while a negative counter counts a number of consecutive times the amplitude of that current signal is greater than a negative current threshold. If the positive counter or the negative counter exceeds a maximum count, it is determined that an inverter sub-module is operating abnormally.

REFERENCES:
patent: 6320349 (2001-11-01), Kaneko et al.
patent: 7525269 (2009-04-01), Patel et al.

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