Abstract: Aiming at problem of powertrain torsion vibration of electric vehicle, the inherent characteristics of the driveline, the torque characteristics of the motor and the response of the powertrain were analyzed and studied. An electromechanical coupling simulation method was proposed, considering both the dynamic characteristics of motor and driveline. First of all, the powertrain torsion vibration model was established, inherent characteristic was simulated and tested by experimental data. Then vector control model of permanent magnet synchronous motor (PMSM) was established, and torque characteristic was analyzed. Finally, sensitivity analysis of motor parameters was conducted by establishing electromechanical coupling model of motor and driveline. The results indicate that motor parameters considering torque ripple effect the powertrain vibration characteristics, it has a linear proportion at the low frequency realm, and has nonlinear even inverse proportion at the higher frequency realm.
Key words: electric vehicles; power train; torsional vibration; permanent magnet synchronous motor(PMSM); torque ripple