| 摘要 |
PURPOSE:To drive a mover efficiently, by making the amplitude values of current flowing into two mechanical arms, equal to each other, and by keeping the phase difference to be always 90 degrees. CONSTITUTION:With an ultrasonic wave motor driving circuit, the output of an oscillating circuit 7 for generating driving signals is divided into two: one is inputted to a variable amplifier 9 via a variable phase shifter 8, and the other is inputted to an amplifier 10 as it is. By the variable amplifier 9 and the amplifier 10, said respective driving signals are amplified up to an amplitude value necessary for driving an ultrasonic wave motor, and driving signal after being amplified is applied to two electrode groups of a piezoelectric unit 2 composing a driving unit, through resistance elements R1, R2 for detecting driving current. The driving unit is elastically oscillated according to the driving signals. As a result, an elastic traveling wave with an extremely reduced standing wave can be excited, and a mover can be efficiently driven. |
