We investigated the efficiency of the storage device based on the piezoelectric generator (PEG) in the form bimorph, which is a circular plate with inertial mass; the active material is a PMN-0,33PT relaxor. The plate is fixed along the contour in the body of the device, which performs vertical harmonic oscillations with a given amplitude and frequency. Our studies based on finite element modeling and numerical calculation in the ANSYS package. A notable feature of relaxors is a significant dependence of their properties on temperature, so in this paper, we studied the relation on operating temperature and the magnitude of the active load of the resonant frequencies, output voltages and electric power of the device with oscillations at these frequencies. Based on performed calculations we have established the values of the active resistances of the external electric circuit for different temperature ranges at which the device is most effective.
Keywords: energy storage, relaxor ferroelectric, PEG
This paper considers modeling of piezoelectric generator, which is an element of the devices of energy storage. The piezoelectric generator is a cylindrical coordinate with the attached proof mass. The device frame makes the vertical harmonic vibrations with the given amplitude and frequency. By developed models directly calculated in packages ANSYS and ACELAN, the dependence of the natural frequencies and the output voltage on the geometrical dimensions, material combinations. We numerically studied two cases: vibrations at the resonance frequency and vibrations in the low frequency region at the frequency which is much smaller frequency of the first resonance. In addition, we investigate simplified accounting model of the proof mass.
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