Superimposing-type longitudinal vibration modal rotary piezoelectric motor

The invention relates to a superimposing-type longitudinal vibration modal piezoelectric motor, and belongs to the technical field of piezoelectric driving. The superimposing-type longitudinal vibration modal piezoelectric motor includes studs, a rear cover plate, piezoelectric ceramic wafers, an electrode plate, a modal converter, lower end springs, a conic rotor, upper end springs and nuts. A stator assembly of the rotary piezoelectric motor is composed of the rear cover plate, the piezoelectric ceramic wafers, the electrode plate and the modal converter; and the conic rotor is a rotor partof the rotary piezoelectric motor. A positive pressure pretightening force adjusting mechanism of the piezoelectric motor rotor and the stator assembly is composed of the upper springs, the lower springs and the nuts. According to the superimposing-type longitudinal vibration modal rotary piezoelectric motor, the modal converter is driven to be oblique by superimposing longitudinal vibration modalof two groups of the piez