By Dirk Spreemann
Electromagnetic vibration transducers are obvious as a good way of harvesting ambient strength for the provision of sensor tracking structures. assorted electromagnetic coupling architectures were hired yet no finished comparability with appreciate to their output functionality has been performed prior to now. Electromagnetic Vibration strength Harvesting Devices introduces an optimization method that's utilized to figure out optimum dimensions of the elements (magnet, coil and again iron). 8 diverse typically utilized coupling architectures are investigated. the implications exhibit that right dimensions are of serious importance for maximizing the potency of the power conversion. A comparability yields the architectures with the simplest output functionality power which will be ideally hired in purposes. A prototype improvement is used to illustrate how the optimization calculations could be built-in into the design–flow. Electromagnetic Vibration strength Harvesting Devices pursuits the clothier of electromagnetic vibration transducers who needs to have a better in-depth figuring out for maximizing the output functionality.
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Additional resources for Electromagnetic Vibration Energy Harvesting Devices: Architectures, Design, Modeling and Optimization
Architecture A V is quite similar to A IV. The only difference is the ring–magnet instead of the cylindrical magnet and the central pole core is therefore made of ferromagnetic material. 2 “Magnet Across Coil” Architectures Whenever the centre axis of magnet and coil is orthogonal to the oscillation direction the architecture is included in the “Magnet across coil” class. 1). In architecture A VI two rectangular magnets oscillate across a cylindrical coil. To increase the magnetic flux gradient in the coil the magnets are polarized in opposite direction.
Here the resting position is directly given by the maximum inner displacement of the magnet. Another “Magnet in–line coil” architecture without back iron is A III, where two opposite polarized magnets oscillate inside a coil. The gap between the magnets is defined by a spacer and cannot be reduced arbitrarily due to the repulsive force of the magnets. Because the arrangement is symmetrical the resting position is in the middle of the coil. Architecture A IV is the first architecture with back iron.
Thus from the theoretical point of view the theory of developing vibration transducers is similar to the development of passive vibration isolators . However for vibration transducers it is assumed that the energy conversion as well as the mass of the transducer has no effect on the vibration source. This assumption is fulfilled as long as the mass of the transducer is much smaller than the mass of the vibration source. A commonly used linear single degree of freedom mechanical model of a vibration transducer is shown in Fig.