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Comment by cosmotron

19 hours ago

They're pretty cool. They can be good in situations where you don't want any backlash and lots of torque. I believe they're very popular as actuators in robotics.

The cycloid you may not know you already have could often be found mounted under the chassis of vans and pickup trucks to compactly turn the takeup reel for the cable that lowers and raises the spare tire stowed underneath the vehicle.

The reel holds fast its position naturally when the cable is at any length, and allows a heavy truck tire to be lifted manually using the light-duty hand crank.

Notice in the Github animation that the visible rotor has nine lobes and the stator has 10 stations, this can be confirmed if you take a screenshot.