Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1988-06-02
1993-10-05
Shoop, Jr., William M.
Electricity: motive power systems
Induction motor systems
Primary circuit control
388811, 318807, 363 41, 363 98, H02P 540
Patent
active
052508900
ABSTRACT:
In an inverter control apparatus including a pulse width modulation inverter supplied with power from a d.c. power source to generate an a.c. output, a frequency control unit controlling the output frequency of the inverter, and a voltage control unit controlling the output voltage of the inverter, a frequency adjusting unit is provided to adjust the operating frequency of the inverter so that the product of voltage and time in each positive half cycle of the output voltage of the inverter becomes equal to that in the next adjacent negative half cycle of the output voltage of the inverter. When the inverter is used in an apparatus for controlling an induction motor, the frequency adjusting unit adjusts the output frequency of the inverter according to the result of detection of a ripple factor of an input voltage of the inverter, and a frequency adjusting-factor correcting unit corrects the frequency adjusting factor of the frequency adjusting unit according to at least one of the output of an induction-motor rotation frequency detector and the output of the voltage control unit.
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Miyake Wataru
Nakamura Kiyoshi
Nakata Kiyoshi
Suzuki Katsuaki
Tanamachi Tokunosuke
Cabeca John W.
Hitachi , Ltd.
Shoop Jr. William M.
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