| Vibration energy can be seen everywhere in the environment of daily life and is not limited by the natural environment.At the same time,it has the advantages of green environmental protection and renewable.Therefore,it is of great significance to convert the vibration energy widely present in the environment into electrical energy to power low-power electronic devices.With the emergence of giant magnetostrictive materials represented by iron gallium alloys,vibration energy collection and power generation technologies based on giant magnetostrictive materials have attracted attention from all walks of life.Although there are a large number of civil or industrial scenarios that can use rotational kinetic energy,there is little research on collecting energy from rotational motion.The characteristics of the power plant were studied.Based on the Villari effect of giant magnetostrictive materials,this paper proposes a research method for collecting vibration energy in a rotating environment and converting it into electrical energy.The overall structure design of the magnetostrictive vibration energy collection and power generation device using the thin sheet iron-gallium alloy as the core material of the device was determined.The core part of the device is a double cantilever beam system composed of iron gallium alloy and two elastic beams.A 60 W motor is selected to drive the device to rotate,and the speed range is set to 0-150 rpm.Then by comparing the permanent magnet and the energized coil,it is determined that the permanent magnet is selected to provide the bias magnetic field.Subsequently,the base material was analyzed using the finite element method.By comparing the natural frequencies of different base materials,it was found that beryllium copper as the base material had a lower natural frequency.According to Faraday's law of electromagnetic induction,1000 turns are selected considering the number of coil turns.Finally,the finite element software was used to simulate and analyze the typical cantilever beam structure,the double cantilever beam structure,and the addition of weights on the double cantilever beam.It was found that the form of adding the weights on the double cantilever beam structure had the lowest natural frequency.It proves the rationality of the designed structure.Then according to the mass-spring-damping beam dynamics theory,the relationship between the form of externally applied excitation and the deformation and stress of the material is analyzed.Through analysis,it is found that the device has the best power generation effect when the resonance frequency is close to the natural frequency of the cantilever.Subsequently,the iron-gallium alloy-electric conversion model was established to describe the electromechanical conversion process.Finally,the experimental prototype was fabricated.Four sets of comparative experiments are designed for the influence of bias magnetic field and counterweight in a certain speed range.The experimental results show that the bias magnetic field has a significant effect on the power generation effect of the device.When the bias magnetic field is placed up and down,and the number of up and down is four(the specific value of the magnetic field strength),the maximum voltage is generated.This method is a better bias condition,and the device has a better effect on the ability to collect rotary vibration.The free weights can generate a larger voltage than the fixed weights.When the optimal free weights are 5g,the vibration collector can generate a maximum voltage of 320 mV under the best bias magnetic field.Finally,the power of the device under load is analyzed experimentally.Under the optimal bias and weight conditions,when the external load is connected and the coil impedance is close,the output electric power reaches the maximum,the maximum value is 232?W. |
PDF Full Text Request