A high power ultrasonic linear motor using a longitudinal and bending hybrid bolt-clamped langevin type transducer

A hybrid transducer type ultrasonic linear motor using the I st longitudina l and the 2nd bending vibration modes of a bolt-clamped Langevin type trans ducer has been proposed and studied for accomplishing high mechanical outpu t. The longitudinal vibration generates the mechanical driving force and th e bending vibration controls the frictional force. To obtain large vibratio n amplitude and large mechanical output, a method of tuning the longitudina l resonance frequency to the bending one was investigated using finite elem ent simulations, and demonstrated experimentally. To avoid magnetic interac tion, we employed phosphor bronze for the bolt of the transducer. The proto type motor achieved the no-load velocity of 0.47 m/s and the maximum output mechanical force of 92 N.