Quote:
Originally Posted by Lizard
Not sure about magnet strength and drag and how it affects torque.
But what I've read is, that Lehner motors have very little magnet drag. They don't have iron cores (not sure what that is in english, it's called "Luftspule" in German, direct translation would be "air-coil"), so that thing about the iron core causing this seems to make sense.
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Googled a bit and I think those are called ironless motors or coreless (if it's brushed). They run smoother than conventional iron cored motors and have less hysteresis losses.