A method of modal parameter estimation based on electromagnetic vibration exciter

The experimental modal test of the structure of the driving motor has always provided a major contribution to understand and control the vibration phenomena encountered in practice. The Hammer Test is a common method to obtain a mathematical model of the structure and to validate the theoretical model and Finite Element Method (FEM) model. However, the hammer or the vibration exciter will increase the test cost. In this paper, an electromagnetic vibration exciter is proposed to achieve the frequency response functions (FRF) and then the modal parameters can be extracted. The Finite-element analysis (FEA) and experiments of a 6p/36s PM motor have been conducted to verify the proposed method.