Electronics > Projects, Designs, and Technical Stuff
100+kW Motor Controller
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NiHaoMike:
A quick explanation of how the motor windings can be used as the inductor for a boost converter:
http://techno-fandom.org/~hobbit/cars/boost-hack/
max_torque:
Any idea what the EMC performance of the inverter is?  I assume you have software control of the igbt gate drive so can vary the dv/dt to optimise the loss / thermal performance against the EMC one?


(and well done getting this far btw, making an inverter really isn't very difficult, but to make one that is robust, affordable, quiet, has good software and a nice interface, well that's a whole extra level of work!  As someone who's take a hybrid vehicle inverter from concept to OE production i can tell you the last bits are much harder than the first bit......  ;-) )
uer166:

--- Quote from: Psi on May 01, 2019, 12:40:56 pm ---I guess my line of thinking was...
If you dead short the 3 motor windings you will get the best braking action and a massive current flow through the short.

--- End quote ---

Not 100% true AFAIK, the curve for rpm-vs-shorted-phase-currents is non-linear since with increasing motor speed the current gets more and more out of phase of the voltage due to winding inductance. At some point it's so out of phase it's close to 0. It's also why a 3-phase short can be a default fail-safe in a motor that spins at higher rpm to the point where back EMF>>battery voltage (possible through field weakening).
marcos_:

--- Quote from: max_torque on May 01, 2019, 07:48:48 pm ---Any idea what the EMC performance of the inverter is?  I assume you have software control of the igbt gate drive so can vary the dv/dt to optimise the loss / thermal performance against the EMC one?

--- End quote ---

Why would you assume we have a software-controlled dynamic gate driver?

The only drive I know with that feature is tesla high performance rear drive unit, I imagine its gone now that they use SiC. They used it to manage overshoot vs switching losses, I don't see it driven by EMC.
marcos_:
I think this log is of interest for the eevblog audience:
https://hackaday.io/project/164932-axiom-100kw-motor-controller/log/162657-block-diagram-explained

And don't forget the pretty pics and scope captures of the main description
https://hackaday.io/project/164932-axiom-100kw-motor-controller/details

Cheers
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