磁控形状记忆合金振动发电机原理及建模方法研究

在能源日益缺乏的今天,环境中普遍存在的振动能量成为很多科技工作者新的能源资源。重点研究磁控形状记忆合金(magnetic controlled shape memory alloy,MSMA)振动发电机的建模问题。为了充分利用MSMA变形率大、易于控制、可逆效应输出感应电压大的特点,提出了利用MSMA的维拉利效应收集振动能量的发电机原理。通过分析MSMA马氏体相变特性和磁畴运动模式,利用吉布斯自由能函数,建立了MSMA振动发电机的数学模型,求出在磁场和振动力共同作用下振动发电机感应电动势与磁化强度和应变量的数学关系。分别分析了外加振动力、施加磁场、振动频率变化时对发电机输出电压的影响。仿真结果验证了利用MSMA合金制作微型振动发电机的可行性及数学模型的正确性。

Research on the Principle and Modeling of the MSMA vibration generator

Vibrational energy existing in environment has become a new energy resources for a lot of technology workers. This paper mainly study the modeling problem of vibration generator for Magnetic controlled shape memory alloy (MSMA). In order to make full use of MSMA"s good characteristics, such as large deformation rate, easy to control, reversible effect and large output induced voltage, firstly, paper proposed a generator principle by which villa effect of MSMA is used to collect vibrational energy. Secondly, a mathematical model of MSMA vibration generator is constructed by analyzing the MSMA marten site phase transformation characteristics and magnetic domain motion model and using Gibbs free energy function. Thirdly, a mathematical relationship is obtained between Vibration generator induction electromotive force and Magnetization and dependent variable, under the action of magnetic field and vibrations forces. Finally, the affect to output voltage of generator is analyzed when vibration, magnetic field, vibration frequency change. Simulation results demonstrate the feasibility of using MSMA and the correctness of the mathematical model for the micro vibration generator.