Ultrasonic motor driven apparatus.

摘要

Motor-driven apparatus comprising drivable surface-contact means (6,106) engageable with a surface over which the apparatus is to be moved; at least one motor (3,4; 103,104) arranged to drive the surface-contact means (6,106) so as to move the apparatus over the surface in a desired direction or directions; a driving circuit (71) carried by the apparatus and arranged to output drive signals to the or each motor (3,4; 103,104) so as to control movement of the apparatus over the surface characterised in that the or each motor is an ultrasonic motor, the driving circuit (71) being arranged to receive radio control signals from a remote location. <IMAGE>