Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2006-10-31
2011-10-11
Rosenau, Derek (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S400020, C318S400260
Reexamination Certificate
active
08035334
ABSTRACT:
A voltage-command correction unit provided between an electric-power conversion unit and a voltage-command calculation unit provides a predetermined current range including the zero level for the detected output current, and, at a first clock time when the output current enters from outside to inside of the current range, sets a zero cross timing of the output current as a clock time for switching the polarity of the correction voltage that corrects the AC voltage command calculated and output by the voltage-command calculation unit based on the first clock time and the frequency, thereby making a configuration capable of correcting the AC voltage command with the correction voltage with the same polarity as the polarity of the output current around the zero cross point of the output current.
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Kimpara Yoshihiko
Kobayashi Takahiko
Yoshimura Manabu
Mitsubishi Electric Corporation
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Rosenau Derek
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