Patent ID: 6072265
Filing Date: 2000-06-06
Classification: H02N

Abstract:
A supply circuit for a traveling-wave piezo-electric motor comprising at least one rotor driven, by friction, by at least one stator energized by at least two piezo-electric elements linked respectively to the stator and to two electrodes supplied respectively with two alternating voltages (Vp, Va) of like amplitude and phase-shifted by approximately 90.degree. by means of a single alternating supply source and of a means intended for generating the two phase-shifted voltages,wherein the means intended for generating the two phase-shifted voltages consists of a capacitor (C) in series with one of said electrodes and whose value is chosen so that, for a given frequency of the voltage of the source, the amplitude of the voltage between the stator and the electrode of the piezo-electric element in series with the capacitor is substantially equal to the amplitude of the voltage of the source and that the phase shift of the currents in each piezo-electric element is approximately 90.degree..