Patent ID: 8018124

Claim:
A piezoelectric motor comprising: a rotor; a tube stator comprising a piezoelectric material having axial polarization, said stator comprising at least three pairs of electrodes spaced from one another on a top end face thereof and a common electrode on a base end face thereof; and slabs affixed to said stator at spacings between said electrodes, wherein said rotor is pressed towards said slabs by a pre-load force; wherein when a positive charge is applied to a first of said electrodes and a negative charge is applied to a second of said electrodes and an electric common port is applied to said common electrode, D 33 piezoelectric phenomenon is created which causes an area under the first of said electrodes to move in one direction with respect to the base end face and an area under the second of said electrodes to move in a direction opposite to that of the first of said electrodes, thereby causing the spacings between the electrodes to bend and said slabs to tilt, thus applying a frictional pushing side force against said rotor to cause said rotor to rotate, and wherein a voltage is greater at one of the electrodes than the other, thereby lifting and rotating said slabs as well as increasing a contact force between said slabs and said rotor.