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Can anyone help? A search of the internet suggests that it is a "four quandrant chopper". What that is remains a mystery. NausicaaElec Senior Member near Grenoble. I know this is an old thread 4 years! It seems that the translation is indeed "4 quadrant chopper" with no "n" though [wikipedia in english, chopper electronics page] This is a power electronics device which is reversible in both current and voltage.
It means you can have both out voltage and out current positive or negative. It means that you outout voltage can be either higher or lower that input voltage, according to the duty cycle switch command you choose.
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Documentation Help Center. This drive features closed-loop speed control with four-quadrant operation. The speed control loop outputs the reference armature current of the machine. Using a PI current controller, the chopper duty cycle corresponding to the commanded armature current is derived.
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