Ultrasound motors, also known as piezoelectric motors, are quiet, high-torque motors driven by piezoelectric ceramics expanding and contracting under voltage. Unlike motors using electromagnetic force, they operate without coils or magnets, relying on friction. Consequently, they are compact, lightweight, usable in magnetic fields, and exhibit no play. Ideal as direct-drive motors for position control devices like positioning tables, conveyors, angular indexers, and robot arms, they are also suitable for MRI and semiconductor manufacturing equipment.