Introduce a piezoelectric energy generator (PEG) with support device excited by the magnetic coupling force between rotating magnets fixed on a rotator and nickel plate fixed on a piezo-beam. The influence of magnetic force (number of the magnets), rotating speed and the work condition of the piezo-beam (with support device or free condition) on energy generation of the PEG was investigated experimentally. The research results show that there are several optimal rotating speeds for the PEG to achieve peak voltage at speed range of 0 to 1200r/min. Under the distance of rotating magnets and the piezo-beam is given, the peak voltages rise with the increasing of rotating magnets number and rotating speed.The maximum peek voltages from the PEG with 2/3/4 rotating magnets fixed on the rotator are 14.4/18.6/20.2V respectively and optimal rotating speeds are 660/456/348r/min. The support device makes optimal rotating speeds move backward, exerts great influence on the rising phases of the peak voltages, prevents piezo-beam from deforming excessively and improve the reliability of PEG.
To meet the demand of rotating mechanism for self-powered monitoring system, piezoelectric energy generator (PEG) excited by the magnetic coupling force between rotating magnets fixed on a rotator and those fixed on piezo-beam was presented. The influence of magnetic force (number and configuration of the magnets) and rotating speed on energy generation of the PEG was investigated experimentally. The research results show that there are several optimal rotating speeds for the PEG to achieve peak voltage at speed range of 0 to 1390r/min. Under a given number of magnets fixed on the end of the piezo-beam, the peak voltages rise with the increasing of rotating magnets number and rotating speed. At 636r/min, the achieved peek voltages from the PEG with 1/2/4 rotating magnets are 12.1/15.2/20.0V respectively. Besides, the configuration modes of rotating magnets and the fixed magnets (repulsion, attraction, or repulsion-attraction) exert great influence on the peak voltage and the relative optimal rotating speeds. Taking a PEG with 2 rotating magnets for example, the 4th peek voltages and the relative optimal rotating speeds for the PEG under exciting mode of repulsion/attraction//repulsion-attraction are 12.6/15.0/16.4 V and 552/528/492 r/min respectively.
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