EV fundamentals #5: Field Weakening

In this video I go over the implementation of field weakening. It is needed to run permanent magnet motors above their base speed.
Simulator: github.com/Pet...
Thread about it: openinverter.o...
Finding Critical current: openinverter.o...
Finding flux linkage: openinverter.o...
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[@vika_papa]

Thank you very much for this video, I really lacked understanding of these settings. We are waiting for openivertor to configure itself automatically. Thank you

[@davefiddes]

Congratulations to you and Pete for getting to the bottom of this. The video is a very helpful summary of what you've been up to and is a lot easier to understand than the thread which was a bit much for my mechanical/software engineer brain to keep up with. Thanks.

[@EngineersFear]

Thanks, good to hear it makes things clearer

[@A2an]

A lot of work, but satisfying to see it works.😊👍

[@EngineersFear]

Yes, the first (set of) successful test drive(s) (in both Prius and Leaf based cars) was very thrilling!

[@bildmateria]

Big respect for this effort for sure! I followed progress of course in the forum and wondered how you can be sure the motor model behaves like a real motor. It worked in the end of course, but I assumed at some point you would need to spin a motor on the bench fast & with a load to provoke the error and tighten your think - deploy - test loop. Maybe this is something to ask Pete at some point!

[@EngineersFear]

Thanks!
After going back and forth between simulated and real car and Pete making adjustments, we could see the two converge. A test bench with two motors would fill in the gap but is quite an expensive and room-taking endeavour

[@mehmetcx]

Could you please teach us active short circuit, derating and limp pump mode?

[@EngineersFear]

Derating I could do, the other two I've never heard about. What's a limping pump and active short circuit?