【作者】 王利利；

【导师】 张京军；

【作者基本信息】 河北工程大学 ， 水利水电工程， 2009， 硕士

【摘要】 开关磁阻电机(Switched Reluctance Motor简称:SR电机)是双凸极的结构形式,磁路的高度非线性使得其精确模型很难建立;且由于SR电机由脉冲供电,电机气隙小,有显著变化的径向磁吸力,使壳体结构发生压缩形变而振动,引起SR电机较大的振动和噪声,限制了其应用范围。本文基于虚位移原理得出径向力数值解,并进一步研究了径向力所引起的振动响应,对SR电机振动和噪声的研究有重要的实际意义。基于有限元原理,本文利用ANSYS软件对SR电机二维电磁场进行分析和计算,并应用虚位移法求解非线性径向力,得出样机径向力与转子位置角和定子相电流的非线性关系曲线,在二维电磁场计算结果的基础上,利用Matlab/Simulink仿真软件建立仿真模型,实行电流斩波控制(CCC)进行动态仿真,仿真结果与理论分析一致,验证了有限元模型的准确性和仿真模型的有效性。从振动系统的运动方程出发,导出了从激振力到振动加速度的传递函数,结合由磁场有限元计算得到的径向力非线性模型进行振动仿真,对径向力及振动加速度波形进行频谱分析,从而可找到它们主要的谐波分量,避免与SR电机定子的固有频率接近而引起共振是降低SR电机振动和噪声的必要条件。更多还原

【Abstract】 The double saliency of the stator and the rotor poles of switched reluctance motor(SRM), as well as the highly saturated nature of the flux density induces the accurate model of SRM is difficult to be constructed. SRM is excited by the pulse and the gap of the motor is small. The remarkable variational radial force during the motor running makes the shelly structure distortion, which induces the serious vibration and acoustic noise of SRM. This paper obtains the exact numeric results of radial force and studies the vibration response caused by the radial force. The results are very helpful to the reseach of vibration and acoustic noise of SRM.In this dissertattion, 2D electromagnetic field of SRM is analysed and calculated by using ANSYS based on the finite element formulation. The non-linear static radial forces at different rotor positions and different phase current excitations are obtained according to the principle of virtual-work. The Matlab/Simulink software is employed to build the simulation model based on the results calculated by the finite element and the dynamic system simulation is done under Chopped Current Control (CCC). The results of simulation are corresponding with theoretical analysis, which validate the effective of the finite element model and simulatiton model.From motion equations, the transfer function from exciting force to the vibrative acceleration is derived. Vibration simulation is completed combining the non-linear model of the radial force obtained by the finite element calculation. The main harmonics components of radial force waveform are derived by the spectrum analysis. It is the primary condition of reducing vibration and acoustic noise to avoid the matching of main harmonics of the radial force with the natural frequencies of SRM.更多还原