To clarify, I don’t mean something like a car engine. I mean, something like I see electric arms that move, then when they get to the point where they need to stop, they stop instantly but then kind of wobble for a second. But then other motors don’t do this, and they just stop instantly without any wobble. I notice this with stuff like animatronic robots. Sometimes low-quality animatronics have the wobble that really takes away from the illusion of life.
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Most of these motors are step motors or motors with worm gears in them.
When the motor stops, the weight of what it holds(the arm and everything the arm holds) creates an impact that kicks on all the other motors freeplay(the loose between parts) necessary for the motors to work without burning themselves out.
The way to stop these wobbles is to program a deceleration in the movements or build those components with dampers or springs to absorb the shock. Both solutions are not necessary if the robot is still at an experimental phase, if it will not be used as a consumer product(as it could look cheap) or if it is not handling sensible objects.
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