This invention relates to a non-contacted supersonic motor including a stator, a rotor, a reversible drive circuit and a rotation speed following control device, in which, the stator is a ring post, the outside of which is set with ring piezoelectric ceramic plates and electrodes, in which, the reversible drive circuit includes a DC supply, a square wave generator, a frequency dividing phase shifter, a power amplified circuit and a transformer boosting circuit, in which, the rotation control device includes a control signal interface circuit, a controller and a motor vibration test circuit, which includes an integral phase shift circuit, a proportion amplified circuit, a subtraction circuit and a discriminating circuit.