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Using two pieces of piezoelectric ceramics, a two-stage energy harvester for an application of micro Ultrasonic Electrical Discharge Machining (UEDM) is developed in this article. Ceramics in the first stage (PZT#1) plays the role of actuator driven with oscillation of high frequency and amplitude. In the second stage (PZT#2), the ceramics receives part of the power transmitted from the actuator in...
A wedge-type piezoelectric motor that can generate high-speed linear or rotary motion is developed. Such a new type of composite piezoelectric ceramic material is constructed with d33 contributing the longitudinal deformation and d15 contributing the shear deformation. Instead of using two individual ceramics to obtain the desired hybrid motion profile, this new approach has the advantage of only...
The stator design of a new type of spherical motor driven by piezoelectric actuators is developed. A curved piezoelectric actuator is designed to attach to the spherical surface. A series of the curved piezoelectric actuators is laid in a line around a spherical surface. By applying an appropriate voltage signal with phase difference on neighboring actuators, a traveling wave is generated on the hemispherical...
A spherical motor driven by piezoelectric actuators is developed. Each set of piezoelectric actuators are laid in a line around a spherical surface, which is designed to provide one degree-of-freedom motion. Applying appropriate voltage signal with phase difference on the neighboring actuators so that traveling wave is generated. All sets of a series of piezoelectric actuators are constructed mutually...
A curve-shape piezoelectric unimorph is used for energy harvest. Deformation of the unimorph will gain electricity via piezoelectric direct effect. In this study, a cantilever unimorph encountered with external force at various vibration frequencies to generate electricity and save into a storage circuitry is investigated. Modeling of the unimorph and storage circuitry is derived. The analytical computation...
By using the piezoelectric direct effect, piezoelectric energy harvesters hold the promise of providing an alternative power generating device. Also, ambient vibration is the focus to provide the amount of available mechanical energy resource that can be converted into electricity by piezoelectric ceramics. Design and analysis of the piezoelectric unimorph ceramic and electric converter as well as...
In this article, speed control for a platform driven by a wedge-type piezoelectric motor is investigated. Such a motion control system is subject to disturbance like friction, preload and operating temperature change, so that a predictive linear relation between the applied input voltage and the output platform velocity is difficult to keep. Especially, operating temperature change is an essential...
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