Standing-wave vibration motor

摘要

A highly-efficient standing-wave vibration motor is disclosed in which the rotating direction can be maintained when the driving frequency is in the vicinity of the resonant frequencies. Driving signals are applied to the motor via an inductance element. The inductance of the element is determined so that the phase difference between a phase of a bending vibration and a phase of a longitudinal vibration with respect to currents in relation to the respective driving voltages does not exceed pi .