车用电机控制器功能安全及主动短路分析

根据永磁同步电机的数学模型,求解了不同工况下永磁同步电机进入主动短路时的电流和转矩输出情况,揭示了主动短路电机输出与电机参数之间的数学关系,并通过仿真和实验进行了验证.从理论角度分析了主动短路作为安全关断方法的优缺点,提出了永磁同步电机主动短路状态下的电流计算公式,为电机控制器选择合适的功率器件提供了依据.

Analysis of Active Short Circuit of Permanent Magnet Synchronous Motor in Electric Vehicles

According to the mathematical model of permanent magnet synchronous motor, this paper uses the analytical method to obtain the current and torque equation of the permanent magnet synchronous motor under the active short circuit operation in different working conditions, and reveals the relationship between the motor output and motor parameters. The results are verified by simulations and experiments. The significance of this paper is that the advantages and disadvantages of using active short circuiting as a safety shut off path is analyzed theoretically, and the current calculation formula for permanent magnet synchronous motor under active short circuit condition is proposed, which provides a basis for the motor controller to select a suitable power device.