I had translated 'impeller' with 'ventilator' and concentrated on the thing on the lower part, which is indeed something fixed - hence I overlooked the rotating rake in the top part.
I find a cyclone without moving parts to be a convincing concept. Though they either have good reasons for their own concept or just want to be different: Ball-bearings in an environment whose raison d'être is mainly to be dusty doesn't really convince me.
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