Fundamental study on the miniture CS-USM by hydrothermally synthesized lead zirconate titanate polycrystalline film transducer for medical applications

A CS-USM (Coiled stator Ultra-Sound Motor) was developed for the purpose of application to medical equipments. The CS-USM is composed of the acoustic waveguide, coiled stator, rotor and transducer, they are possible to miniaturize since the simple structure. However, it is difficult to fabricate smaller CS-USM than our current CS-USM using piezoelectric ceramic transducer. Therefore, we tried to develop the smaller CS-USM by using hydrothermally synthesized lead zirconate titanate polycrystalline film instead of piezoelectric ceramic transducer. In this paper, we describe the measurement of revolution speed of fabricated dual-transducers-type CS-USM.