Research On Vibration Generator Technology For Wave Energy Collection

In recent years,China's marine economy has developed rapidly.In recent years,in order to monitor the changes over the seas,several buoys have been placed along the coastal areas and isolated islands.Traditional battery supply,new wind power generation facilities and photovoltaic power generation have not been fully completed to solve the problem of continuous power supply,bringing lots of problems to real-time monitoring and site communication.Therefore,based on electromagnetic generator technology and wave vibration characteristics,this paper studies wave power generation technology to meet the power demand of such distributed buoy equipment.Firstly,the structure of the wave power generator is designed.By comparing and analyzing the advantages and disadvantages of various pick-up mechanisms,a two-degree-of-freedom pick-up mechanism utilizing compression spring and single pendulum is proposed to convert the linear motion of wave vibration into the rotational motion of the wave generator mover,avoiding the loss of mechanical energy caused by reciprocating linear motion inertia.Since the wave energy effects on the buoy is displacement vibration,the torque cannot be directly applied to the mover.To prevent the electromagnetic torque,the electromagnetic wave generator is designed using the ironless core structure.The finite element analysis software comsol is used to analyze the magnetic field distribution of the wave generator and the magnetic flux in the coil.Passing through analyzing the variation of the magnetic field distribution under different air gaps,and according to the actual processing and assembly precision,the air gap of the electromagnetic structure of the wave generator is determined.Secondly,according to the dynamic characteristics and the principle of electromagnetic induction,the electromechanical coupling characteristics of the wave power generation device are analyzed.The Lagrange equation is used to establish a two-degree-of-freedom mathematical model of the power generation.The dynamic characteristics of the coil and the pendulum under the displacement vibration excitation are described.Based on the model,the simulation program is used to calculate the system response under the sinusoidal wave vibration excitation.Consistent with the calculation results of the commercial simulation software,indicating the correctness of the proposed model.Combining the motion parameters of the mover and the coil,the magnetic induction intensity distribution and the flux change in the coil is calculated under the excitation of the sinusoidal wave vibration.The output electromotive force,the frequency characteristics and conversion efficiency of the system is also calculated based on the electromagnetic induction model and output characteristics.Finally,a prototype of the wave power plant is fabricated for experimental testing and analysis.The prototype of the generator is fabricated using aluminum alloy,Nd Fe B permanent magnet,enameled wire,etc.,and placed in a buoy model for testing.The phase change relationship among every coil is initially tested in the laboratory,and then the power processing circuit is designed and fabricated based on the manostat.Analyzing the simulated vibration characteristics of wave energy,the power generation device is tested in the laboratory.Under the action of amplitude 20 cm and frequency 2Hz wave,the effective value and average power of the generator output electromotive force are 9.17 V and 467 m W,respectively,which can meet the buoy sensor and The power supply requirements of the signal transceiver.