We're in kind of a bind at work and looking for easiest / cheapest way to load an AC generator (Synchronous permanent magnet machine).
We have access to a big 300A Mosfet module along with it's industrial gate driver.
I was wondering if I could rectify the output 3-phase voltage with big diodes such as these ones and then chop the power with the MOSFET into some power resistors.
The big question being : do I need some inductors (this?) to smooth out the current ? The motor main field inductance is > to 10µH.
And we're looking to chop around 100A @400VDC. The goal being of course to make the load vary form 0 to xx 40kW.
So to sum up our interrogations :
- Does this work? :-)
- Do I really need an inductor?
Down below is a crude schematic.