Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2006-09-12
2006-09-12
Fletcher, Marlon (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S727000, C318S807000, C318S503000
Reexamination Certificate
active
07106024
ABSTRACT:
A method and apparatus for use with a controller that supplies voltages to an induction machine via supply lines, the voltages including a fundamental voltage component and an injected voltage component, the line voltages also including harmonic voltage components where the harmonic voltage components include at least a high frequency first harmonic component having a frequency substantially equal to the sum of the fundamental component frequency and the injected component frequencies, the method for identifying the high frequency first harmonic component and comprising the steps of sensing the line voltages, identifying a zero sequence voltage component of the line voltages, rectifying the zero sequence voltage component to generate a rectified signal and using the rectified signal to identify the high frequency first harmonic component.
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Harbaugh Mark Melvin
Royak Semyon
Fletcher Marlon
McCloud Renata
Quarles & Brady LLP
Rockwell Automation Technologies Inc.
Walbrun William R.
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