Please take a minute to review and accept our Terms of Use.
Welcome to the PLECS User Forum, where you can ask questions and receive answers from other members of the community.

Many technical questions regarding PLECS are answered on the Technical Solutions page of our website. Tutorial videos, specific application examples, and pre-recorded webinars are available on our YouTube page. Please follow us on LinkedIn for the latest Plexim news.

4 Quadrant DC Drive

0 votes
42 views
Hello,

I am modelling a 4-Quadrant DC Drive. I managed to make it work for the First Quadrant. But the machine seems not to work in the third Quadrant. I will be glad if someone could help.

Thank you

Estelle
asked Apr 25 by Estelle (12 points)

1 Answer

0 votes
Estelle,

The immediate issue here is the controller, not the machine model.  The current and speed are not regulated as you are intended due to fundamental control implementation errors.  For example, due to the SR Flip-flop in the modulation path you end up with an effectively fixed duty cycle of 0.9 @ 5 kHz.  The settings for the Relay block are to toggle at +/-1 A but the current reference is restricted to 0-0.2A meaning the current cannot be regulated within that window.

I would recommend systematically reviewing your controller to ensure each portion behaves as expected.

Regards,

Bryan
answered Apr 26 by Bryan Lieblick (1,035 points)
...