新型电动车用无刷直流电机回馈制动控制技术

A Novel Regenerative Braking Control Strategy of Brushless DC Motor for Electric Vehicles

分析了无刷直流电机低速能量回馈制动控制的基本原理;针对回馈电流恒定的制动方式中,电流经功率器件的二极管产生损耗较大的缺点,提出了基于同步整流技术的能量回馈制动控制新方法。该方法在回馈制动的续流阶段和充电阶段,反向导通功率管的开关器件代替二极管作为电流回路,以此降低回馈电路上的通态压降,减小功率损耗,达到高效驱动的目的。通过对该方法的分析,得出了调制导通功率器件的逻辑顺序,并根据工程应用进行了相关简化。仿真和试验结果表明,在制动中采用此方法既能高效回馈能量,又能明显缩短制动时间。

The principle of regenerative braking control of brushless DC motor was analyzed. A novel regenerative braking control strategy based on synchronous rectification was proposed to resolve the large loss problem of diode when the current through that used the traditional control. Conducting switches instead of diodes as a current loop reversely in the freewheeling state and the charge state,so the voltage drop on the power devices and the power losses reduced and the efficiency of the drive system improved. After analyzing the principle of the presented control method,logical modulation sequence of switches during braking was achieved and simplified according to engineering applications. Experimental results proved that using the new strategy in braking control not only improved efficiency of energy feedback but also decreased braking time.