This just popped up on my Youtube suggested videos:
Interesting. Good idea, if it can actually keep close to a permanent magnet motor for efficiency. I could see it losing efficiency at lower power outputs, depending on how much energy is required for excitation. OTOH, higher RPMs wouldn't waste power doing field weakening, quite the opposite.
It's just like a PMSM motor inside and how it works, with the exception of using electromagnets inside the rotor.
While the various parts have been done before - synchronous(3-phase) motors, wireless excitation(as in brushless generators), separately excited, etc - this is the first I've seen of putting them all together. Thinking about it, I wonder why it hadn't been done long ago, since the technology was already there...
Welp, hopefully it means noticeably cheaper motors down the road, once others start mass producing them. Would be nice to get ebike motors at half the cost...
