制动装置能量泄放尖峰电压的研究

Research on Over Voltage of Braking Device

大转动惯量电机实现快速停车需要制动装置配合,直流母线电缆的寄生电感与制动装置直流支撑电容匹配不合理时,容易在直流支撑电容上产生尖峰电压,严重影响制动装置对母线电压的准确调节。针对一种大功率瞬时耗能的制动装置,在考虑电路杂散参数基础上,利用拉普拉斯变换建立系统运算电路模型,通过电路暂态过程分析,推导出直流支撑电容电压振幅的表达式。改变电路中影响电压振幅的参数,进行仿真和实验,验证了理论分析和仿真计算的正确性。

Using the braking device to realize rapid braking of a high rotational inertia engine is a normal method. The parasitic inductance of electric cable and direct current sustain capacitance may cause the capacitor voltage too high, which makes it very difficult for brake device to regulate DC voltage. Taking into account some stray parameters, Laplace transformations is applied to build the operational model of the system to analyze the transient process. The voltage expression of the capacitor is developed. By changing experimental conditions, the simulation and experimental results validate the correctness of the theoretical analyses and simulation calculations.