By Kenji Uchino
This reference unearths the main major applied sciences, strategies, and tendencies within the layout and alertness of actuator units for micromechatronic platforms. It addresses serious layout and production suggestions, in addition to demanding situations within the modeling and rules of electromechanical losses and warmth iteration in actuator units. observed through a CD-ROM demonstrating examples of finite-element modeling and formerly built and commercially on hand actuators, Micromechatronics offers perception into the way forward for this evolving box, and considers contemporary advancements in micropositioning expertise and displacement transducer, motor, and ultrasonic motor applications.
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Extra info for Micromechatronics Uchino
A brief introduction to this class of devices is given here. A more thorough description of the piezoelectric effect and electrostriction will be presented in the next chapter. 17 The piezoelectric response shows the characteristic linear strain versus field relation with a noticeable hysteresis, while the electrostrictive response exhibits no hysteresis and a non-linear relation between the induced strain and the applied electric field is apparent. Due to this non-linear behavior, a sophisticated drive circuit is generally needed for electrostrictive actuators.
Okada and T. Kurauchi: Macromolecules, 26, 6958 (1993). V. D. 6 (1996). J. D. Carlson and K. D. Weiss: US Patent 5,382,373 (1995). Y. lll, 55 (1991). The following review papers and books are recommended for further study: 32) K. Uchino: Piezoelectric/Electrostrictive Actuators, Morikita Publishing, Tokyo (1986). 33) K. Uchino: Ceramic Actuators: Principles & Applications, MRS Bull. 18(4), 42 (1993). 34) S. Ueha, Y. Tomikawa, M. Kurosawa and N. Nakamura: Ultrasonic Motors: Theory and Applications, Oxford Science Publ, Monographs in EE.
The inverse dielectric constant, 1/K, also shown in the figure, has a linear dependence on temperature over a broad range in the paraelectric region. 9) (T-TJ where % is the dielectric susceptibility, C is the Curie constant and T0 is the CurieWeiss temperature. 7. It is generally observed that T0 is slightly lower than the Curie temperature, Tc, which is the actual transition temperature for the material. 7 A general depiction of the temperature dependences of the spontaneous polarization, the dielectric constant, and the inverse dielectric constant for a ferroelectric material such as BaTiO3.
Micromechatronics Uchino by Kenji Uchino