【摘要】 直流母线支撑电容是影响直流无刷电机控制系统体积和可靠性的关键因素之一,母线电容纹波电流的计算能够有效指导母线电容的参数选择,为实际工程设计提供依据。目前,针对直流无刷电机方波控制系统的电容纹波电流的解析计算方法鲜有研究。该文针对直流无刷电机方波控制系统的特点,研究了方波控制系统中直流母线电容纹波电流产生的机理,通过分析直流无刷电机换向过程中相电流的变化规律,推导了直流母线电流瞬时值、有效值及平均值的解析关系式,进而得到了直流无刷电机方波控制系统母线电容纹波电流的精确表达式。最后利用仿真和实验结果对分析方法的准确性进行了验证。更多还原

【Abstract】 Ripple current on DC-link capacitor is one of the key factors affecting weight and volume of brushless DC motor(BLDCM) control system. Analytical calculation of the ripple current can guide the process of choosing DC-link capacitor, and can be of help for the BLDCM control system design in practical project. For now, however, there are few studies on the calculation method of the ripple current on DC-link capacitor for BLDCM square wave control system. The generation mechanism of ripple current on DC-link capacitor for BLDCM square wave control system was studied. Based on the analysis of current variation regularity during commutation processes of BLDCM, the analytical expressions of effective value, average value and instantaneous value of DC-link current were derived. The exact expression of the ripple current on DC-link capacitor for BLDCM square wave control system was obtained finally, and the expression accuracy was validated by simulation and test result.更多还原