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Two medium‐sized ultrasonic motors using the first‐order bending vibration (B 1 ) of a cylinder with two free–free ends have been developed in this study. The cylinder‐shaped stators are 10 mm in diameter and 25 mm in length. They are based on novel Pb(Mg 1/3 Nb 2/3 )O 3 –PbTiO 3 (PMN–PT) single crystal and conventional Pb(Zr,Ti)O 3 (PZT) ceramic. The stators of the motors were simulated by a finite element method. The main performances of the motors were measured. The results show that the PMN–PT‐crystal‐based motor with medium size overmatches the conventional PZT‐based motor with: wider exciting frequency; lower exciting voltage, and much larger mechanical output power. The largest revolution speed of the PMN–PT motor is 780 rpm and a maximum load of ∼0.008 N m.
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Luo et al. (2010) studied this question.
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