Structural Design And Characteristics Of Magnetic Shape Memory Alloy Vibration Generator

In the environment, common vibrational energy is a new energy resources discovered byenergy researchers in recent years. Through certain techniques, mechanical vibration isconverted into electrical energy. These techniques include electromagnetic inductiontechnology, piezoelectric technology, and using the certain characteristics of smart materials.In recent years, as a new intelligent material, magnetic controlled shape memory alloy(MSMA) have advantages of larger deformation rate, easy to control, large induction voltagewith reversible effect compared with other intelligent material, so it attract the attention ofresearchers quickly.In this paper, the basic structure framework of the MSMA vibration generator is builtbased on the basic characteristics of the magnetic controlled shape memory alloy (MSMA).This structure is mainly composed of magnetic circuit and measuring element. Andappropriate component materials and the related sensors are selected according to theperformance requirements of each component for more effective to reach the expected aim.Then through the analysis of the martensitic variants and magnetic field characteristics inMSMA, the working principle of the power generation using the MSMA is proposed. Andcombining with the thermodynamic principle of Gibbs free energy function, the mathematicalmodel of the MSMA vibration generator is establish, which is the mathematical relationshipabout the output induced voltage and input vibration stress. The established mathematicalmodel is simulated using MATLAB, and the influences of amplitude and frequency of inputvibration stress on the output inductive voltage of the generator are observed respectively inorder to put forward effective measures for improving the output response of generator.Finally, testing platform is built by virtual instrument and the human-computerinteraction interface is established, which are convenient for observing the output response ofthe generator according to the needs of user. Test results are consistent with the MATLABsimulation results, and this way is more convenient to operate by user and its output resultsare more intuitive. The filtering effect of the generator is also tested when the output signal is disturbed. The simulation results show the feasibility of the micro-vibration generator made ofMSMA and the correctness of the mathematical model. This lay a good foundation for thefuture development of MSMAvibration generator.