关键词: 低地板车辆, 永磁电机, 噪声, 直接转矩控制, 空间矢量脉宽调制, 优化

Abstract: Aiming at the problems of excessive noise and poor sound quality of autonomy permanent magnet motor for low floor vehicle, the vibration and noise test and characteristic analysis of actual line running at medium and low speedwere carried out. The relationship between autonomy permanent magnet motor noise and autonomy traction system control was analyzed from IGBT switching frequency and control mode. The experimental test verified the feasibility of noise optimization control scheme. The results showed that the switching frequency of IGBT in autonomy traction system was low, and the noise component of 48 order electromagnetic force wave in direct torque control based on Bang-Bang control was a sharp sound. In the case of space vector pulse width modulation, IGBT switching frequency had a great influence on the electromagnetic noise of autonomy permanent magnet motor and vehicle interior. In the case of direct torque control based on Bang-Bang control, the influence of IGBT switching frequency on the electromagnetic noise of autonomy permanent magnet motor and vehicle interior was small. The noise level of autonomy permanent magnet motor could be improved by using space vector pulse width modulation and appropriate IGBT switching frequency, which could provide guidance for improving the sound quality of autonomy traction system of low floor vehicles.

Key words: low floor vehicle, permanent magnet motor, noise, direct torque control(DTC),space vector pulse width modulation(SVPWM), optimization