Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2006-09-05
2006-09-05
Fletcher, Marlon T. (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S811000, C318S599000, C318S801000, C318S808000, C363S041000, C363S098000
Reexamination Certificate
active
07102327
ABSTRACT:
A technique for reconstructing phase currents based on measurements of a DC bus current. Non-observable regions of DC bus current samples to reconstruct phase currents are reduced in size by using two phase space vector modulation. The non-observable regions can be further reduced by omitting deadtime insertions for switch actuations when output current is higher than a given threshold. Voltage command vectors in non-observable areas can be constructed by two time averaged vectors one of which is constructed to obtain an observable DC bus current reflecting motor phase current. The additive vectors have the same combined time average value as that of the voltage command vector in order to preserve volt-seconds. Current samples may also be averaged to provide a more accurate reconstruction of phase current. Current samples are time delayed to avoid transients for more accurate readings. When three phase PWM inverter modulation results in inability to determine the motor phase current from the DC bus measurement, the technique includes dynamically switching to two phase PWM modulation to reduce the time interval when the motor phase current is not determinable through the DC bus current measurement.
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Fletcher Marlon T.
International Rectifier Corporation
McCloud Renata
Ostrolenk Faber Gerb & Soffen, LLP
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