Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1993-10-04
1996-07-02
Cabeca, John W.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318811, H02P 534
Patent
active
055325696
ABSTRACT:
An electric railway vehicle control system including a converter for converting a single-phase a.c. voltage to a d.c. voltage, a PWM inverter for inverting the d.c. output of the converter to a variable voltage, variable frequency a.c. voltage, and a three-phase induction motor supplied with the a.c. output voltage of the inverter to drive electric railway vehicles. The control system further includes a unit for controlling the output voltage of the inverter in a variable voltage, variable frequency mode for changing the output voltage substantially relative to a change in the output frequency thereof and in a constant voltage, variable frequency control mode for fixing the output voltage to a substantially constant value, and a unit for detecting a rectification ripple in a frequency band including a frequency double the frequency of the single-phase a.c. voltage included in the d.c. input voltage to the inverter.
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Miyake Wataru
Nakamura Kiyoshi
Nakata Kiyoshi
Suzuki Katsuaki
Tanamachi Tokunosuke
Cabeca John W.
Hitachi , Ltd.
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