| 摘要 |
PROBLEM TO BE SOLVED: To solve such a problem that since a piezoelectric motor drives a rotating body by bringing a protrusion into contact with the side face of the rotating body, the current flowing to a piezoelectric element is distorted by the reaction force at the time of contact.SOLUTION: The piezoelectric motor includes a rotating body, a piezoelectric actuator having a protrusion coming into contact with the rotating body, and rotating the rotating body by motion of the protrusion when driving a piezoelectric element, and a drive circuit for driving the piezoelectric element. The drive circuit includes a driving signal generation unit for outputting a driving signal of a predetermined frequency, a current detection unit for detecting a current flowing to the piezoelectric element, an extraction unit for extracting a harmonic component of the current, and a correction unit for correcting the driving signal on the basis of the harmonic component and applying the driving signal thus corrected to the piezoelectric element. |
