Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Electrical signal parameter measurement system
Reexamination Certificate
2007-09-25
2007-09-25
Barlow, John (Department: 2857)
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Electrical signal parameter measurement system
C702S038000, C702S076000, C324S522000, C324S701000
Reexamination Certificate
active
10525227
ABSTRACT:
The present invention relates to a method of diagnosing deterioration by comparing an index value which is obtained by dividing the relative harmonic content of each order of the current harmonics flowing into an electric motor and inverter by the total harmonic distortion of the current harmonics up to the predetermined order, with a criteria value which is obtained by multiplying a harmonic function of each order formed of the index value by a calculated value for diagnosis of each order found through calculation from the relative harmonic content of each order. In the method, the degrees of deterioration of the electric motor and inverter are distinguished from each other by weighting the criteria value, and the deteriorated part is determined by a specific harmonic order of the current harmonics.
REFERENCES:
patent: 5739698 (1998-04-01), Bowers et al.
patent: 11-083686 (1999-03-01), None
patent: 2002-189064 (2002-07-01), None
patent: 2003-075516 (2003-03-01), None
ATEC Co. Ltd.
Baker & Hostetler LLP
Barbee Manuel L
Barlow John
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