Abstract
Power extraction from ambient vibrations is currently needed or the technology, and the amount of energy in ambient vibration is low and is sufficient to operate small devices. In the present article a methodology is proposed to extract the maximum amount of power from these sources. This paper includes the method to increase the output voltage in a vibration energy harvesting device. The vibration amplitude depends on stiffness, mass damping, vibrating source amplitude and frequency. Various methods are developed to increase the voltage output from these devices. An induced voltage can be further increased by changing the initial relative position between the magnet and coil. Magnetic flux density is found to be maximum in the vicinity of the coil. When the top magnet side matches with the coil centre, then the induced voltage is found to be maximum as compared to other relative positions between the coil and magnet. The multi-magnet arrangement has been used to enhance the total output of the device by keeping appropriate relative position of magnet with respect to the coil. A theoretical and experiment investigation is conducted on these methods, and a theoretical simulation is carried out using a FEA tool, and the experimental results closely match with the theoretical results. Four magnet coils have been considered in this study which gives the maximum output of 1.937 V, 1.426 V, 2.01 V and 2.27 V at 14 Hz frequency. With the help of a multi-magnet arrangement, maximum 7.64 V and 11.44 mW is reached. It observed that the multi-magnet arrangement is the best and gives the maximum voltage output as compared to other methods.
Highlights
All over the world, day by day the energy becomes more expensive and is found to be rarer and rarer
In the vibration energy harvesting device, the 3 mm displacement is given to the magnet within the frequency spectrum of 0 to 16 Hz to generate the energy in the form of voltage
The Vibration energy harvesting (VEH) device arrangement is simulated in the ANSOFT Maxwell software which is set to 2D DESIGN
Summary
Day by day the energy becomes more expensive and is found to be rarer and rarer. VOLTAGE ENHANCING USING MULTI-MAGNETIC ARRANGEMENT FOR LOW FREQUENCY VIBRATIONAL ENERGY HARVESTING. General energy harvesting devices taken into consideration are mechanical motion rectifiers [16,17,18,19], piezoelectric shock absorbers [20, 21] and electromagnetic regenerative shock absorbers [15, 22,23,24]. The VEH devices have one major limitation of low efficiency resulting in the low-voltage generation at a low frequency [26, 27]. Different devices and sensors require a higher voltage power source [28] which the VEH device does not provide. The second part of this paper covers the use of multi-magnet arrangement to enhance a voltage generated in the VEH device
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