Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1992-08-11
1993-09-21
Shoop, Jr., William M.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318825, H02P 540
Patent
active
052472370
ABSTRACT:
An object of the invention is to provide a control device of an induction motor where an inverter circuit can be protected from overcurrent by stable current limitation operation not only at steady operation but also at rapid acceleration/deceleration or at regenerative braking. A current component calculation circuit calculates a first current component from primary current detected by a current detector and output frequency. A correction frequency calculation circuit calculates a frequency correction value using a current limit value and the first current component according to prescribed function calculation. A subtractor subtracts the frequency correction value from a primary frequency command value. A voltage component calculation circuit calculates a primary voltage component command value according to the subtracted output. A primary voltage command calculation circuit calculates a primary voltage command value of the induction motor from the subtracted output and the primary voltage component command value and outputs it to a voltage conversion circuit.
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Imanaka Akira
Koyama Masato
Cabeca John W.
Mitsubishi Denki & Kabushiki Kaisha
Shoop Jr. William M.
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