Patent ID: 6288475
Filing Date: 2001-09-11
Classification: H02N

Abstract:
An ultrasonic motor comprising:a stator-side elastic member having a rotationally symmetrical press-contact face;a rotor-side elastic member having a rotationally symmetrical press-contact face facing the press-contact face of the stator-side elastic member, the rotor-side elastic member being supported so as to be angularly displaceable about a rotation symmetry axis;a stator-side vibrating element for generating a rotational displacement wave of frequency Fs on the press-contact face of the stator-side elastic member;a rotor-side vibrating element for generating a rotational displacement wave of frequency Fr on the press-contact face of the rotor-side elastic member, the rotor-side elastic member being angularly displaced at a rotational speed proportional to a frequency difference .DELTA.F between the frequency Fs and the frequency Fr; anda rotary transformer for supplying drive power having a phase difference equivalent to N phases (N is an integer equal to or more than 2) to the rotor-side vibrating element which is angularly displaced together with the rotor-side elastic member, the rotary transformer including more than N transformer circuits concentrically arranged, N transformer circuits which are sequentially arranged inwardly from an outermost one being used as drive power transformer circuits.