考虑磁致伸缩效应的偏转式发电机的振动特性研究

为了提高风能利用率,解决现有开关磁阻发电机转子旋转的单一性问题,提出一种新型可偏转双定子开关磁阻式风力发电机。首先,基于电磁-固体力学模块,建立定子结构磁固耦合数值模型,对电磁场、磁通密度、磁致伸缩密度进行了理论分析。其次,采用有限元平台对发电机进行了直观建模,基于力学理论建立考虑磁致伸缩效应的电磁-固体力学基本方程。最后,通过有限元法对发电机内、外双定子以及转子自转、偏转进行磁固耦合仿真,得到应力分布及对应的振动位移。仿真结果表明:磁致伸缩效应下的振动位移属纳米级别且所受应力较小,对发电机运行影响可忽略不计。磁固耦合的分析方法可为分析电机振动、进一步优化发电机参数提供理论参考。

Study on vibration characteristics of deflection generator considering magnetostrictive effect

In order to improve the utilization of wind energy and solve the problem of single rotor rotation of existing switched reluctance generators, a new type of deflectable dual stator Switched Reluctance Wind generator is proposed. Firstly, based on the electromagnetic-solid mechanics module, the electromagnetic field, flux density and magnetostrictive density of stator structure are analyzed theoretically by establishing the magneto-solid coupling numerical model. Secondly, the finite element platform is used to model the generator intuitively. based on the theory of mechanics, the basic equation of electromagnetic solid mechanics considering magnetostrictive effect is established. Finally, the finite element method is used to simulate the internal and external stators of the generator and the rotation and deflection of the rotor. The stress distribution and the corresponding vibration displacement are obtained. The simulation results show that: The vibration displacement under magnetostrictive effect belongs to nanometer level and the stress is small, so the influence on generator operation can be neglected. The analysis method of magneto-solid coupling provides theoretical reference in analyzing motor vibration and further optimizing generator parameters.