MODES OF OPERATION OF PIEZOELECTRIC MOTOR

A piezoelectric motor (1) including a rotor (3), a stator (2) including a piezoelectric material having axial polarization, the stator (2) including at least three pairs of electrodes (5, 6) and a common electrode on a base end face thereof, and slabs (4) affixed to the stator (2) at spacings between the electrodes (5, 6), characterised in that the electrodes (5, 6) include a first set of electrodes B and a second set of electrodes R, the electrodes (B, R) receiving electrical driving signals from a controller (29) and being isolated from one another, and the controller (29) has a mode of operation wherein the B electrodes and the R electrodes receive phase shifted sinusoidal electrical signals creating three standing waves under tips of the slabs (4).