This paper presents a method of establishing simplified equivalent circuit model of traveling wave ultrasonic motor by using 1/2 wavelength stator with the similar vibration characteristics. Combined with the vibratio...This paper presents a method of establishing simplified equivalent circuit model of traveling wave ultrasonic motor by using 1/2 wavelength stator with the similar vibration characteristics. Combined with the vibration mode characteristics of the composite stator, the method utilizes Hamilton principle to obtain precise solution of the simplified equivalent circuit. The model shows the mechanism of ultrasonic motor, considering the influence of non-axisymmetric vibration mode, tooth outline, anisotropy of PZT (Piezoelectric ceramic), etc. With this method, various electric parameters corresponding to different vibration modes, such as static capacitance, dynamic capacitance, dynamic inductance, dynamic resistance, equivalent input impedance, etc., can be solved. Experiments show good agreement with theoretical results.展开更多
On the basis of apparent elasticity method, we derived the equivalent circuit of coupling vibration of a short column and discussed its frequency equation and the effects of the load impedance on the resonant frequenc...On the basis of apparent elasticity method, we derived the equivalent circuit of coupling vibration of a short column and discussed its frequency equation and the effects of the load impedance on the resonant frequency of the short column. By the equivalent circuit, we calculated the input mechanical impedance of the longitudinally-excited short column and the curves of the apparent vibration velocity ratio versus the geometrical dimensions of the column. It shows that the equivalent circuit method is a simple and convenient one to analyze and calculate the coupling vibration of the short column.展开更多
文摘This paper presents a method of establishing simplified equivalent circuit model of traveling wave ultrasonic motor by using 1/2 wavelength stator with the similar vibration characteristics. Combined with the vibration mode characteristics of the composite stator, the method utilizes Hamilton principle to obtain precise solution of the simplified equivalent circuit. The model shows the mechanism of ultrasonic motor, considering the influence of non-axisymmetric vibration mode, tooth outline, anisotropy of PZT (Piezoelectric ceramic), etc. With this method, various electric parameters corresponding to different vibration modes, such as static capacitance, dynamic capacitance, dynamic inductance, dynamic resistance, equivalent input impedance, etc., can be solved. Experiments show good agreement with theoretical results.
文摘On the basis of apparent elasticity method, we derived the equivalent circuit of coupling vibration of a short column and discussed its frequency equation and the effects of the load impedance on the resonant frequency of the short column. By the equivalent circuit, we calculated the input mechanical impedance of the longitudinally-excited short column and the curves of the apparent vibration velocity ratio versus the geometrical dimensions of the column. It shows that the equivalent circuit method is a simple and convenient one to analyze and calculate the coupling vibration of the short column.
