15-12-2012, 01:05 PM
Ultrasonic Motor
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ABSTRACT
Ultrasonic motors are special cateogry of electrical to mechanical transducers . these are non electromagnetic type unlike conventional motors like dc motor ,ac motor , stepper motor and servo motor etc . such motors have a very specialised application area which require compact design (about 1cm²) low speed and high torque . due to slow speed and high torque ,ultrasonic motors are used in direct drive mechanism reducing number of working parts and vibration .ultrasonic motors are mostly used in digital camera auto focus mechanism.ultrasonic motors run on high frequency supply (about 50Mhz). such motors are employed at places where electromagnetic noise can affect device’s operation.