I've heard there are issues with series wound motors if the motor doesn't have interpoles (whatever those are). I think it has to do with the brushes being advanced. The soliton hasn't implemented it in their software, even though they have the hardware, I believe. I also remember Otmar (zilla) going through quite a process to get it working, but it wasn't at all simple. Even then, I'm not sure how practical it was.
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