| Thermoacoustic power generation technology is a kind of thermal power generationtechnology, which has the advantages of high reliability, low production cost, high thermalefficiency, heat source widely and environmental protection. It is a kind of emergingtechnology to solve the energy problem and environmental problem nowsday.Thermoacoustic power generation system is made up of thermoacoustic engine subsystemand linear generator subsystem. At present the research of linear generator for thetechnology has just started internationally.According to the requirements of high frequency and small stroke in thethermoacoustic system, transverse flux linear generator is proposed and specific theoreticalanalysis is proceeded. It is verified by simulation and experiment. The specific researchcontent as follow:(1) According to the power source characteristic of thermoacoustic system, transverseflux linear generator is proposed. After analysing the structure and working principle ofthis generator, the expressions of induced electromotive force and electromagnetic force isdeduced.The detent force is analyzed by using the energy method. It is concluded thatduring a certain range of mover displacement, the size of detent force is proportional tomover displacement, the direction is opposite. So the detent force has be neutral and can beused for compensating the spring force.(2) A30W transverse flux linear generator is designed. The3D model of thegenerator is built by using the finite element simulation software Ansoft Maxwell andelectromagnetic analysis are accomplished. The impact of opening lightening holes in themover on performance is analysed.The impact of the structure parameters such as thewidth of air gap, the thickness and the axial length of permanent magnet on detent force isalso analysed.(3) Bonding force characteristic of the generator, a forced vibration model isestablished and the motion characteristic is analyzed. The analysis results show that in order to make the generator working at mechanical resonance state, a compensationcapacitor need to be inserted into the load circuit, to make the circuit part resonance andthe electromagnetic force and the mover speed reverse phase. The impact of mechanicalresonance and load resistance on efficiency and output electric power is also analysed. Theresults show that efficiency is not related to mechanical resonance and have maximum inthe condition of proper load resistance. Output electric power can be improved in themechanical resonance and also have maximum in the condition of proper load resistance.(4) The prototype is manufactured and experimental platform is built. The detentforce and no-load electromotive force of the prototype is tested. The results show thattheoretical analysis is correctness. |
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