It uses a small electromagent coil to twist the rare earth magnet with a linkage or end effector attached. In the video it is being used for a micro-aircraft rudder.
The direction of the current will determine which direction it will rotate while the magnitude of current and the field strength of the rare earth magnet will determine the torque.
HyperPhysics has all the equations you could ever need to determine the required size and shape of the coil and magnet.
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