Linear stepping ultrasonic motor

A linear stepping ultrasonic motor, based on vibrators alternative driving and slider grooves positioning, is proposed in this paper. The step-by-step movements can be obtained by exciting two vibrators of stator by turns. The motor is capable of bi-direction stepping movements without accumulative position errors driven by an open-loop control circuit, which provides single-phase sinusoidal signal via a switch unit to the vibrators. Its step displacement is 1 mm. The speed without load in one step is 7.69 ∼ 8.33 mm/s, and the blocking force is 0.12 ∼ 0.35 N in operating frequency 30 kHz and operation voltage 300 Vpp.