The invention discloses an electric vehicle permanent magnet synchronous motor back electromotive force suppression method and system, and relates to the technical field of electric vehicles, the method comprises the following steps: if an electric vehicle is in a motor high-speed power failure or fault high-speed trailer state and the current rotating speed of the motor is greater than a preset rotating speed, adjusting the exciting current and the torque current according to the voltage of the bus capacitor, and controlling the on-off of a switching device in the three-phase bridge circuit,so that the voltage of the bus capacitor is within a preset voltage range until the current rotating speed of the motor is not greater than the preset rotating speed. According to the back electromotive force suppression method and system for the permanent magnet synchronous motor of the electric vehicle, the bus capacitor and a switching device in a three-phase bridge circuit are protected against damage, meanwhile, the whole vehicle has enough time, the vehicle speed is reduced to zero through a braking system, the motor efficiency cannot be reduced, the motor cannot be overheated, and the maintenance cost cannot be increased.
本发明公开了一种电动车永磁同步电机反电动势抑制方法及系统,涉及电动车技术领域,该方法包括以下步骤:若电动车处于电机高速掉电或故障高速拖车状态,且电机的当前转速大于预设转速,则根据母线电容的电压调节励磁电流和转矩电流,控制三相桥式电路中的开关器件的通断,使母线电容的电压在预设的电压范围内,直至电机的当前转速不大于预设转速。本发明中的电动车永磁同步电机反电动势抑制方法及系统,在保护母线电容和三相桥式电路中的开关器件不受损坏的同时,使整车有足够的时间利用制动系统将车速降为零,不会降低电机效率,不会导致电机过热,也不会增加维护成本。
Electric vehicle permanent magnet synchronous motor back electromotive force suppression method and system
一种电动车永磁同步电机反电动势抑制方法及系统
2021-03-02
Patent
Electronic Resource
Chinese
IPC: | B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen |
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