Rotary-linear piezoelectric actuator using a single stator

We report a piezoelectric actuator having a single stator with rotary and linear motions (RLPA). The stator is fabricated as a single metallic cube with a through-hole. The surface of the inner circle of the hole generates elliptical motions at each natural frequency, transferring the energy to an output shaft, when AC voltages at the appropriate resonant frequency are applied to the piezoelectric elements. This study clarifies the principle of rotary and linear motions and uses finite element methods (FEM) to show how the elliptical motions are generated. Modal analysis illustrated the shapes of the vibration modes and the natural frequencies, and the shape of the stator was designed accordingly. A dynamic analysis of the stator showed the generation of elliptical motion in the directions of the rotary and linear motions. The prototype RLPA was successfully actuated at the resonant frequencies, consistent with the dynamic analysis. The speed of the rotary and linear motions was obtained.

[1]  K. Takemura,et al.  Design of a plate type multi-DOF ultrasonic motor and its self-oscillation driving circuit , 2004, IEEE/ASME Transactions on Mechatronics.

[2]  T. Funakubo,et al.  Ultrasonic Linear Motor Using Multilayer Piezoelectric Actuators , 1995 .

[3]  Shinji Sato,et al.  Design of a precision rotary-linear dual-axis positioning system with a surface encoder , 2005, International Symposium on Optomechatronic Technologies.

[4]  Guangjun Liu,et al.  On Development of a Rotary–Linear Actuator Using Piezoelectric Translators , 2006, IEEE/ASME Transactions on Mechatronics.

[5]  T. Zhou,et al.  Study of a Mini-Ultrasonic Motor with Square Metal Bar and Piezoelectric Plate Hybrid , 2006 .

[6]  Kenjiro Takemura,et al.  Design and control of an ultrasonic motor capable of generating multi-DOF motion , 2001 .

[7]  H. Wang,et al.  VIBRATIONAL MODES OF THICK CYLINDERS OF FINITE LENGTH , 1996 .

[8]  K. Watterson,et al.  Performance improvement of rectangular-plate linear ultrasonic motors using dual-frequency drive , 2004, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[9]  E. Gierczak,et al.  Double-Winding Rotary-Linear Induction Motor , 1987, IEEE Transactions on Energy Conversion.

[10]  Philippe Lutz,et al.  Design, development and experiments of a high stroke-precision 2DoF (linear-angular) microsystem , 2006, Proceedings 2006 IEEE International Conference on Robotics and Automation, 2006. ICRA 2006..

[11]  K. Nakamura,et al.  A piezoelectric micromotor using in-plane shearing of PZT elements , 2004, IEEE/ASME Transactions on Mechatronics.

[12]  S. Beeby,et al.  A novel multi-degree-of-freedom thick-film ultrasonic motor , 2002, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[13]  D. A. Henderson.  Simple Ceramic Motor . . . Inspiring Smaller Products , 2006 .

[14]  Nobuyuki Iwatsuki,et al.  Precision positioning with a rotary-linear motor driven by a pair of 2-D ultrasonic actuators , 1996, MHS'96 Proceedings of the Seventh International Symposium on Micro Machine and Human Science.