Experimental Verification of the Simulation Models
In Chap. 4 the results from the parameter optimization for each architecture were discussed in detail. As a basic outcome, the optimum values of certain geometrical parameters were identified which yield either in a maximum output power or in a maximum ou
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Experimental Verification of the Simulation Models
5.1 Introduction In Chap. 4 the results from the parameter optimization for each architecture were discussed in detail. As a basic outcome, the optimum values of certain geometrical parameters were identified which yield either in a maximum output power or in a maximum output voltage. At the end of Chap. 4 the performance limits have been compared and architectures which perform best with respect to the output power and the output voltage became apparent. However, especially for the quantitative comparison of the architectures, it is of great importance to verify the simulation models to ensure that the supposed advantage or disadvantage does not result from inaccuracies in the simulation model. This chapter is concerned with the experimental verification of the simulation models. The most critical source of error in the simulation is the transduction factor. This is because it is calculated in different ways dependent on the architecture class. In order to investigate the transduction factor experimentally a measurement setup has been developed and built up as illustrated in Fig. 5.1. The measurement setup includes a lab shaker on which the oscillating components of the electromagnetic coupling architectures (magnets and if existent the back iron components) are mounted. The shaker is installed in a fixing stage which also contains a xyz adjustment unit. With this xyz adjustment unit a coil can be positioned relative to the oscillating components. Together with an acceleration sensor, a controller unit and an amplifier the shaker is operated in a closed loop, which allows controlling the vibration amplitude (pure z–direction). In case of a vibration at a given amplitude and frequency the open circuit emf amplitude "O is measured at different zero crossing positions of the magnet relative to the coil (illustrated for the example of architecture A VI in Fig. 5.2). Because the peak velocity of the oscillation ZOP (defined by the amplitude and frequency of the vibration) becomes maximal at the zero crossing point the transduction factor is simply given by the quotient of the emf amplitude and the peak velocity (2.21). However, the transduction factor will
D. Spreemann and Y. Manoli, Electromagnetic Vibration Energy Harvesting Devices, Springer Series in Advanced Microelectronics 35, DOI 10.1007/978-94-007-2944-5 5, © Springer ScienceCBusiness Media B.V. 2012
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5 Experimental Verification of the Simulation Models
Fig. 5.1 (a) Measurement set up for the experimental verification of the simulation models. Several test devices of the electromagnetic coupling architectures (in the figure A I is pictured) are mounted on a lab shaker. The shaker oscillates with controlled amplitude in z–direction. The induced voltage is measured with an oscilloscope. Therewith the transduction factor can be derived and compared to the simulation results. Exemplarily a test device of A IV is shown in (b) and a test device of A VI in (c)
not be equal over a large displacement range
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