| 摘要 |
PURPOSE:To improve efficiency by using a longitudinal one-torsional composite piezoelectric vibrator, exciting half-wave torsional resonance and one-wavelength longitudinal resonance in the piezoelectric vibrator and turning a rotor. CONSTITUTION:A longitudinal one-torsional composite piezoelectric vibrator is composed by holding and unifying a connector 7 between a vibrator, in which a piezoelectric element 1 for exciting torsional vibrations is held and integrated by columnar ultrasonic vibrators 3, 4, and a vibrator, in which a piezoelectric element 2 for exciting longitudinal vibrations is put and unified by columnar ultrasonic vibrators 5, 6. The composite piezoelectric vibrator is formed so that the torsional half-wave resonance of the vibrators 1, 3, 4 and the longitudinal one wave resonance of the vibrator constructed by the whole are conformed. Consequently, only the vibrators 1, 3, 4 generate torsional half-wave resonance when AC voltage is applied to the piezoelectric element 1 and torsional half- wave resonance is excited, and the whole conducts longitudinal vibrations when AC voltage is applied to the piezoelectric element 2. A rotor 12 is pressure- welded to the end face of the vibrator 3 by employing the composite vibrator, thus rotating the rotor 12. |
