Digital frequency / phase control device for driving ultrasonic motor

摘要

In the present invention, a ring-shaped metal body having a concavo-convex shape is fixed and a predetermined number of piezoelectric ceramic elements are fixed on the back surface of the stator metal body, and then an annular metal body having the same size as the stator metal body When an AC voltage of the same magnitude and a different phase is supplied to adjacent piezoelectric ceramic elements of the piezoelectric ceramic elements, the upper and lower vibrations generated in the respective piezoelectric ceramic elements are referred to as traveling waves The ultrasonic motor driving frequency / phase control device for driving the ultrasonic motor in which the frictional force is applied in a direction opposite to the traveling wave direction, and the rotating force is generated due to the rotation of the rotor metal body in close contact with the upper surface of the stator metal body In particular, a square wave signal of a specific frequency and a A phase difference signal for outputting a square wave signal as a first output signal and a square wave signal as a second output signal by phase delaying the square wave signal according to data according to a phase difference, And a control unit for inputting a square wave signal of a specific frequency and data on a phase difference of a predetermined magnitude to the phase difference signal generating unit to control the phase difference and signal size of the two signals applied to the ultrasonic motor, To a driving digital frequency / phase control apparatus.