Modal Analysis To Vehicle Drive Motor Based On Finite Element And Experimental Verification

The driving motor plays an important role in electric vehicle, which can crucially affect the dynamic performance, maneuverability and NVH ability of the vehicle. This thesis carries out the model analysis of the permanent magnet synchronous motor, which can support the design of driving motor, ensure the natural frequency of the motor escapes the area of the frequency of excitation force and enhance the design quality, efficiency and reliability of the motor.According to the performance demands of the drive motor, the motor is modeled by the Pro/E software considering the motor working principle and structure of permanent magnet synchronous motor, and the factors that affect the drive motor modal are analyzed.On the basis of simplified model, then the finite element modal analysis combined with element analysis software Workbench is carried out for the motor to calculate first ten natural frequency and mode shapes. The analysis showed that the natural frequency of the motor is far greater than the frequency of the motor excitation force, so the motor resonance is avoided.The motor modal analysis is completed by using the hammering method. The experiment involves motor mount, vibration point selection, selection of measuring point and data collection and analysis, then the test result is summarized and error is analyzed. The error between the result of finite element analysis and the test result is within3.5%, which shows that the finite element analysis is reliable.The research results not only verify the current drive motor scheme is reasonable and reliable, also provide the beneficial reference and guidance for the drive motor design and development.