Piezoelectric generator of mechanical vibrations, and piezoelectric motors based on the generator

A piezoelectric motor, comprising:

• a support;
• a stator extending from the support and defining a rotational axis;
• a piezoelectric generator rigidly coupled to the stator, comprising a piezoelectric ring having upper and lower plane surfaces and a first quality factor (Q-factor), a sound-wave conducting gasket acoustically coupled to the upper plane surface, a metal resonator ring acoustically coupled to the conducting gasket, the metal resonator ring having a second Q-factor substantially greater than the first Q-factor, and one or more bent elastic pushers extending from a periphery of the metal resonator ring;
• and
• a rotor rotatably and mechanically coupled to the stator, said rotor having a rotor inner circumferential surface,
• wherein an external diameter of the conducting gasket is less than half of an external diameter of the metal resonator ring, wherein said piezoelectric ring, said conducting gasket, and said metal resonator ring are concentrically aligned with respect to the rotational axis, wherein said bent elastic pushers contact the rotor inner circumferential surface of the rotor, and wherein the stator and the support are acoustically isolated from the piezoelectric generator.

A piezoelectric motor, comprising:

• a support;
• a stator extending from the support and defining a rotational axis;
• a first piezoelectric generator rigidly coupled to the stator and having one or more first bent elastic pushers extending radially with respect to said rotational axis;
• an output shaft rotatably and mechanically coupled to the stator;
• a second piezoelectric generator rigidly coupled to the output shaft and having one or more second bent elastic pushers extending radially with respect to said rotational axis,
• a frictional coupler rotatably and mechanically coupled to the output shaft, said coupler having an upper inner circumferential surface and a lower inner circumferential surface,
• wherein each of said first and said second piezoelectric generators comprise a piezoelectric ring having upper and lower plane surfaces and a first quality factor (Q-factor), a sound-wave conducting gasket acoustically coupled to the upper plane surface, and a metal resonator ring acoustically coupled to the conducting gasket and having a second Q-factor substantially greater than the first Q-factor, an external diameter of the conducting gasket being less than half of an external diameter of the metal resonator ring,
• wherein said piezoelectric ring, said conducting gasket, and said metal resonator ring in each of said first and second piezoelectric generators are concentrically aligned with respect to the rotational axis, and wherein the stator and the support are acoustically isolated from the first and second piezoelectric generators.